summaryrefslogtreecommitdiffstats
path: root/vendor/tracing-subscriber-0.3.3
diff options
context:
space:
mode:
Diffstat (limited to 'vendor/tracing-subscriber-0.3.3')
-rw-r--r--vendor/tracing-subscriber-0.3.3/.cargo-checksum.json1
-rw-r--r--vendor/tracing-subscriber-0.3.3/CHANGELOG.md902
-rw-r--r--vendor/tracing-subscriber-0.3.3/Cargo.toml150
-rw-r--r--vendor/tracing-subscriber-0.3.3/LICENSE25
-rw-r--r--vendor/tracing-subscriber-0.3.3/README.md61
-rw-r--r--vendor/tracing-subscriber-0.3.3/benches/enter.rs64
-rw-r--r--vendor/tracing-subscriber-0.3.3/benches/filter.rs308
-rw-r--r--vendor/tracing-subscriber-0.3.3/benches/filter_log.rs315
-rw-r--r--vendor/tracing-subscriber-0.3.3/benches/fmt.rs331
-rw-r--r--vendor/tracing-subscriber-0.3.3/benches/support/mod.rs49
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/field/debug.rs111
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/field/delimited.rs184
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/field/display.rs117
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/field/mod.rs366
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/filter/directive.rs424
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/filter/env/directive.rs846
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/filter/env/field.rs416
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/filter/env/mod.rs738
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/filter/filter_fn.rs749
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/filter/layer_filters.rs830
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/filter/level.rs27
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/filter/mod.rs66
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/filter/targets.rs681
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/fmt/fmt_layer.rs1205
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/fmt/format/json.rs750
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/fmt/format/mod.rs1798
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/fmt/format/pretty.rs415
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/fmt/mod.rs1275
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/fmt/time/datetime.rs410
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/fmt/time/mod.rs134
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/fmt/time/time_crate.rs276
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/fmt/writer.rs1464
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/layer/context.rs434
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/layer/layered.rs471
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/layer/mod.rs1285
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/layer/tests.rs308
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/lib.rs218
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/macros.rs28
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/prelude.rs19
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/registry/extensions.rs274
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/registry/mod.rs604
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/registry/sharded.rs904
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/registry/stack.rs77
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/reload.rs237
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/sync.rs57
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/util.rs153
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/cached_layer_filters_dont_break_other_layers.rs123
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/duplicate_spans.rs48
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/field_filter.rs115
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/filter.rs187
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/filter_log.rs63
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/fmt_max_level_hint.rs10
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/hinted_layer_filters_dont_break_other_layers.rs131
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/layer_filter_interests_are_cached.rs69
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/layer_filters/boxed.rs42
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/layer_filters/downcast_raw.rs68
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/layer_filters/filter_scopes.rs131
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/layer_filters/main.rs188
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/layer_filters/targets.rs59
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/layer_filters/trees.rs146
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/multiple_layer_filter_interests_cached.rs131
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/registry_max_level_hint.rs11
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/registry_with_subscriber.rs25
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/reload.rs81
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/same_len_filters.rs81
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/support.rs412
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/unhinted_layer_filters_dont_break_other_layers.rs123
-rw-r--r--vendor/tracing-subscriber-0.3.3/tests/utils.rs39
68 files changed, 22840 insertions, 0 deletions
diff --git a/vendor/tracing-subscriber-0.3.3/.cargo-checksum.json b/vendor/tracing-subscriber-0.3.3/.cargo-checksum.json
new file mode 100644
index 000000000..3fd14355e
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"CHANGELOG.md":"fd7a732ca8d5997cf09a6ffbde0dda0667873031884aa3549d6044971dc00a66","Cargo.toml":"4908f04be83f94bc75fbcf4244fa57b8a52c984928a3320550b692c1038d5448","LICENSE":"898b1ae9821e98daf8964c8d6c7f61641f5f5aa78ad500020771c0939ee0dea1","README.md":"803714740b5ad75ac31a0f9dafd10e0d4d62f7c27c2c0e182d2076a313b0649b","benches/enter.rs":"4a94a04e2abd07950ef2f0b646f4dcdf4ff00abf6396edb5a53c8b41b7691b1a","benches/filter.rs":"6374005ffa47fa19880bb95e3e37406f40ea72a02c5136f4d5eb4c663d452b18","benches/filter_log.rs":"612716bdf9a188093e84d014a4847f18157f148f7d64e54150cd5c91ac709a8a","benches/fmt.rs":"5a0ff37967ffef3a221eebb78855d031e2e883a8a67528c8e794cc6f16cbee8a","benches/support/mod.rs":"72bef51154da9c9b3d81300195c1929a818858fa4b4fc2aa07b49ca586f4cd39","src/field/debug.rs":"4ab50198a0b042d92fefa77b5cac0aef7ba6936149fa555f4b6e2036dcd7f2d7","src/field/delimited.rs":"e6b2dcbf9cb1e9b5e862b462f91190adaf8e14f9c2c5d2048ad651f49cfa2007","src/field/display.rs":"9c06a52919dbe9bfd4cf7eec39293240c9facebe052a2fecc2f21184beb5195f","src/field/mod.rs":"35e3dd4ad7b49c99a24e80c6a40a00b3189a114488793657d6d733a90d2e10f6","src/filter/directive.rs":"7ecf87b17afbddadbc385764c2d9c1fda4b020a08d75f741f8e34c7dc475bd74","src/filter/env/directive.rs":"628f9f566ccee924d43d79b287c569abfc32c2fb74e078958aed6cb8285cfb4f","src/filter/env/field.rs":"9f2ceaedf2e2ecefaff863347ef8dfa85cd5f64a0fd09a0f77f64f412c9bb548","src/filter/env/mod.rs":"7f864a5ef0c008c7fe9a21d0a94bb87dd72746e628ff3e68c18b0fd173763918","src/filter/filter_fn.rs":"0debbc4a4b4d2a57b2a06905017ac908bf34b0a64aaf961535fbf6f4d5a700a9","src/filter/layer_filters.rs":"16ff19fed003b913de4f85a03b31864d71ee73c7ce86b07c80da07fe633f682e","src/filter/level.rs":"cc449757aac47caaf19dd5ba4d74c8efbcd7531fcd6c13da0c5f6fdda12cc9ca","src/filter/mod.rs":"8ebfd0dc92415ff27ec552f20919e598842a87186f13f120449053a96e1e3307","src/filter/targets.rs":"5cec882366d7f12de0a88f7daaac8499785ce9e3832619f251876a02ae19a6bf","src/fmt/fmt_layer.rs":"486264d810ab6b28428bd48e00774fc822762fc9f991332a2d94a42b3168f2e6","src/fmt/format/json.rs":"1a38c049e1bf99efaf7db1f1fd26d3a5bb1e768fc1524c95816708e5d39fca35","src/fmt/format/mod.rs":"ff92f7910bed4f3c0c2ce798333d273d6b5b5fc09cc78031f52d13e043986227","src/fmt/format/pretty.rs":"eecf278b15cc60b35c3f6aa5d05452401c7a4a29195357e92318d684fcfe3072","src/fmt/mod.rs":"270ffa0a9e6543a602247fccef276a3012daa558181f24cd9032292edbc8dc2c","src/fmt/time/datetime.rs":"778d4604d800e46b940087394e7b72750738b554e02aea523fa9820ab0768c08","src/fmt/time/mod.rs":"304c9383e5cfc0c42d79f47a10323ed5a98585e018b127924b0925ec067f0739","src/fmt/time/time_crate.rs":"bacec2c8bb31175b85f2fb3ae40155a08b2aab7a04adaf4c88679147dc651c58","src/fmt/writer.rs":"1d7a4e2dddddff1bfd1344f2cecdb6b2b69b015c9869d95987d26e177dffa793","src/layer/context.rs":"2478693e2faffdf2e519b6d37e1c3aa3dd75088185accc2b68ffa8612bf73195","src/layer/layered.rs":"ba918a9b944f2c083cbb75d6d7f99f90083aa0a29cf3f4f1dd78aa034e09ade6","src/layer/mod.rs":"e1804cfe91051020cac63fb1067d196552ebb844b6c6d1d2279b97dbec1c64df","src/layer/tests.rs":"3e974d627c4bc4269cfa10c82c890e596c9d46af8e6bc03c6c117bde1237e948","src/lib.rs":"cb362279b3c6d23645cda6d768707576f460e275d332d5350a036437cd5404e0","src/macros.rs":"e184bffc6b5999c48e365ad08343dca764a5fb711b789beb26bd1d5f1d767726","src/prelude.rs":"088635def33be9a4c4b6ed934dc22540c555e27d62f7625a43aa9c0e525ca467","src/registry/extensions.rs":"7333aefd69c767212a7924c57283442430edccb17092c91e02a7d13b2d312b11","src/registry/mod.rs":"4f0108e75e0f6e239b8eb69fcad052f25e3b887e412e951e0cbec02cf13f05d5","src/registry/sharded.rs":"972bdd94f43a33ef1f2ebf96ea69ebe4c1d4b0215e69315a3b525783c2025696","src/registry/stack.rs":"9ef333d6a8a28a064e80ff1e376dbb07bc597009010ec332b2dc3ab435d737c2","src/reload.rs":"41fa9a1a28fef626e302a80a68d665492e73ef6d1a2a3c2a7aac5d6c9a0bb496","src/sync.rs":"7f78f3de5b618a999be0e61f936a233975e7769f1ebb55a0e48c3d199e9c45e3","src/util.rs":"55b4e9d63112f9d5a12a287273a9b1212741058384332d3edc024168cacfd627","tests/cached_layer_filters_dont_break_other_layers.rs":"b2084542a014abeff821b30b2b8c21e32bfdcffae53ce5335fb588f557fa4244","tests/duplicate_spans.rs":"48f596bbfabcc6618244afddcf3c3f2e915b9d79284f17bdd0e0616ad29929be","tests/field_filter.rs":"c44d88ab711164a2b1b3a09377284b469f79ddf4651416515a035782c7c64b79","tests/filter.rs":"a43d23e867af779031b6245047092aca57ee26980a8f3faa19036542bcd37f06","tests/filter_log.rs":"e0cd9d394dbfeeb80570a7686bc7f588c5489657980436810711ed8852f86169","tests/fmt_max_level_hint.rs":"d4c6d6f976ae41ab8052fa610a7337ad7150802cbd5634cb30fc45c1f215cfcd","tests/hinted_layer_filters_dont_break_other_layers.rs":"d5ba9cfb6784cf59f007e673ad549dc722d109f6b3d4a69f6aa11b25ca10b469","tests/layer_filter_interests_are_cached.rs":"d036d1c4bc3754e94ebfdda9c841f4858ccec40aba0720f3fbf26c817bfe5a83","tests/layer_filters/boxed.rs":"04db459721a26d6502a2b3fbe42154c5a451021a9374a18c017d10971f44e0c0","tests/layer_filters/downcast_raw.rs":"9b90ead571543cbe14e89b4fe637360d9baf3069f6f656ed3bdf65e7318648f1","tests/layer_filters/filter_scopes.rs":"02611bc58d0d8a67a127eca8cab1b2d9a9901bd2c8a8daad41adf6089b28aee0","tests/layer_filters/main.rs":"0316d611c740e234b78ed9a9dae392fe80472c1e8b004a007ad2dd87d068c67b","tests/layer_filters/targets.rs":"138e3f9ddd68571d94c5aff9d54ee2fbc5f44724c6ee42477a411740ccb79ee6","tests/layer_filters/trees.rs":"4df7b5cf12da44a9255c56e5b80e2b0cf84820230ba916f324c67bc3ee4e4605","tests/multiple_layer_filter_interests_cached.rs":"1ea195f03e58d715228ec1b604f85bda2fc82812d05b2f6370d5edd34a035f32","tests/registry_max_level_hint.rs":"ba386d32b8d13832d7009163241c3d0723488c0393d85647eb9368776251e4fc","tests/registry_with_subscriber.rs":"13b92ed68d9013aefefbc4c73e695c690630e4460634206d214db4c19abb7c0f","tests/reload.rs":"4566386b1b26e6609f5a4bf0e6bef1c2245a591d12417cee189b26dfa14f7f95","tests/same_len_filters.rs":"50c8f5fa1494773410a9f52a56b303534a01a023b186cf2f3131e5e7706eb156","tests/support.rs":"75559505af8018012739d24b3c8743dd079b4d3a8ae28f08b4586a961720aa7b","tests/unhinted_layer_filters_dont_break_other_layers.rs":"519cfef4977e511af938546d4208c645a28248c8ed8666daf180f0ad32f0a261","tests/utils.rs":"2b04ce2d8b56a9062a025900104853e081eae8e3f113f990a915d5f9dea6577b"},"package":"245da694cc7fc4729f3f418b304cb57789f1bed2a78c575407ab8a23f53cb4d3"} \ No newline at end of file
diff --git a/vendor/tracing-subscriber-0.3.3/CHANGELOG.md b/vendor/tracing-subscriber-0.3.3/CHANGELOG.md
new file mode 100644
index 000000000..c380ff3b1
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/CHANGELOG.md
@@ -0,0 +1,902 @@
+# 0.3.3 (Nov 29, 2021)
+
+This release fixes a pair of regressions in `tracing-subscriber`'s `fmt` module.
+
+### Fixed
+
+- **fmt**: Fixed missing event fields with `Compact` formatter ([#1755])
+- **fmt**: Fixed `PrettyFields` formatter (and thus `format::Pretty` event
+ formatter) ignoring the `fmt::Layer`'s ANSI color code configuration ([#1747])
+
+[#1755]: https://github.com/tokio-rs/tracing/pull/1755
+[#1747]: https://github.com/tokio-rs/tracing/pull/1747
+
+# 0.3.2 (Nov 19, 2021)
+
+### Fixed
+
+- **fmt**: Fixed `MakeWriter` filtering not working with `BoxMakeWriter`
+ ([#1694])
+
+### Added
+
+- **fmt**: `Writer::has_ansi_escapes` method to check if an output supports ANSI
+ terminal formatting escape codes ([#1696])
+- **fmt**: Added additional ANSI terminal formatting to field formatters when
+ supported ([#1702])
+- **fmt**: Added `FmtContext::span_scope`, `FmtContext::event_scope`, and
+ `FmtContext::parent_span` methods for accessing the current span and its scope
+ when formatting an event ([#1728])
+- **fmt**: Improved documentation on implementing event formatters ([#1727])
+
+[#1694]: https://github.com/tokio-rs/tracing/pull/1694
+[#1696]: https://github.com/tokio-rs/tracing/pull/1696
+[#1702]: https://github.com/tokio-rs/tracing/pull/1702
+[#1728]: https://github.com/tokio-rs/tracing/pull/1728
+[#1727]: https://github.com/tokio-rs/tracing/pull/1727
+# 0.3.1 (Oct 25, 2021)
+
+This release fixes a few issues related to feature flagging.
+
+### Fixed
+
+- **time**: Compilation error when enabling the "time" feature flag without also
+ enabling the "local-time" feature flag ([#1685])
+- **registry**: Unused method warnings when the "std" feature is enabled but the
+ "registry" feature is disabled ([#1686])
+
+[#1685]: https://github.com/tokio-rs/tracing/pull/1685
+[#1686]: https://github.com/tokio-rs/tracing/pull/1686
+
+# 0.3.0 (Oct 22, 2021)
+
+This is a breaking release of `tracing-subscriber`. The primary breaking change
+in this release is the removal of the dependency on the [`chrono` crate], due to
+[RUSTSEC-2020-0159]. To replace `chrono`, support is added for formatting
+timestamps using the [`time` crate] instead.
+
+In addition, this release includes a number of other breaking API changes, such
+as adding (limited) support for `#![no_std]` targets, removing previously
+deprecated APIs, and more.
+
+### Breaking Changes
+
+- Removed APIs deprecated in the v0.2.x release series.
+- Renamed `Layer::new_span` to `Layer::on_new_span` ([#1674])
+- Removed `Layer` impl for `Arc<L: Layer<S>>` and `Arc<dyn Layer<S> + ...>`
+ ([#1649])
+- Replaced the [`chrono` crate] with the [`time` crate] for timestamp formatting, to
+ resolve [RUSTSEC-2020-0159] ([#1646])
+- Removed `json` and `env-filter` from default features. They must now be
+ enabled explictly ([#1647]). This means that `RUST_LOG`-based filters _will not_
+ work unless the `env-filter` feature is enabled.
+- Changed `FormatEvent::format_event` and `FormatFields::format_fields`
+ trait methods to take a `Writer` type, rather than a `&mut dyn fmt::Write`
+ trait object ([#1661])
+- Changed the signature of the `MakeWriter` trait by adding a lifetime parameter
+ ([#781])
+
+### Changed
+
+- **layer**: Renamed `Layer::new_span` to `Layer::on_new_span` ([#1674])
+- **fmt**: Changed `FormatEvent::format_event` and `FormatFields::format_fields`
+ trait methods to take a `Writer` type, rather than a `&mut dyn fmt::Write`
+ trait object ([#1661])
+- **json**, **env-filter**: `json` and `env-filter` feature flags are no longer
+ enabled by default ([#1647])
+### Removed
+
+- Removed deprecated `CurrentSpan` type ([#1320])
+- **registry**: Removed deprecated `SpanRef::parents` iterator, replaced by
+ `SpanRef::scope` in [#1431] ([#1648)])
+- **layer**: Removed deprecated `Context::scope` iterator, replaced by
+ `Context::span_scope` and `Context::event_scope` in [#1431] and [#1434]
+ ([#1648)])
+- **layer**: Removed `Layer` impl for `Arc<L: Layer<S>>` and
+ `Arc<dyn Layer<S> + ...>`. These interfere with per-layer filtering. ([#1649])
+- **fmt**: Removed deprecated `LayerBuilder` type ([#1673])
+- **fmt**: Removed `fmt::Layer::on_event` (renamed to `fmt::Layer::fmt_event`)
+ ([#1673])
+- **fmt**, **chrono**: Removed the `chrono` feature flag and APIs for using the
+ [`chrono` crate] for timestamp formatting ([#1646])
+### Added
+
+- **fmt**, **time**: `LocalTime` and `UtcTime` types for formatting timestamps
+ using the [`time` crate] ([#1646])
+- **fmt**: Added a lifetime parameter to the `MakeWriter` trait, allowing it to
+ return a borrowed writer. This enables implementations of `MakeWriter` for
+ types such as `Mutex<T: io::Write>` and `std::fs::File`. ([#781])
+- **env-filter**: Documentation improvements ([#1637])
+- Support for some APIs on `#![no_std]` targets, by disabling the `std` feature
+ flag ([#1660])
+
+Thanks to @Folyd and @nmathewson for contributing to this release!
+
+[#1320]: https://github.com/tokio-rs/tracing/pull/1320
+[#1673]: https://github.com/tokio-rs/tracing/pull/1673
+[#1674]: https://github.com/tokio-rs/tracing/pull/1674
+[#1646]: https://github.com/tokio-rs/tracing/pull/1646
+[#1647]: https://github.com/tokio-rs/tracing/pull/1647
+[#1648]: https://github.com/tokio-rs/tracing/pull/1648
+[#1649]: https://github.com/tokio-rs/tracing/pull/1649
+[#1660]: https://github.com/tokio-rs/tracing/pull/1660
+[#1661]: https://github.com/tokio-rs/tracing/pull/1661
+[#1431]: https://github.com/tokio-rs/tracing/pull/1431
+[#1434]: https://github.com/tokio-rs/tracing/pull/1434
+[#781]: https://github.com/tokio-rs/tracing/pull/781
+
+[`chrono` crate]: https://crates.io/crates/chrono
+[`time` crate]: https://crates.io/crates/time
+[RUSTSEC-2020-0159]: https://rustsec.org/advisories/RUSTSEC-2020-0159.html
+
+# 0.2.25 (October 5, 2021)
+
+This release fixes an issue where a `Layer` implementation's custom
+`downcast_raw` implementation was lost when wrapping that layer with a per-layer
+filter.
+
+### Fixed
+
+- **registry**: Forward `Filtered::downcast_raw` to wrapped `Layer` ([#1619])
+
+### Added
+
+- Documentation improvements ([#1596], [#1601])
+
+Thanks to @bryanburgers for contributing to this release!
+
+[#1619]: https://github.com/tokio-rs/tracing/pull/1619
+[#1601]: https://github.com/tokio-rs/tracing/pull/1601
+[#1596]: https://github.com/tokio-rs/tracing/pull/1596
+
+# 0.2.24 (September 19, 2021)
+
+This release contains a number of bug fixes, including a fix for
+`tracing-subscriber` failing to compile on the minimum supported Rust version of
+1.42.0. It also adds `IntoIterator` implementations for the `Targets` type.
+
+### Fixed
+
+- Fixed compilation on Rust 1.42.0 ([#1580], [#1581])
+- **registry**: Ensure per-layer filter `enabled` state is cleared when a global
+ filter short-circuits filter evaluation ([#1575])
+- **layer**: Fixed `Layer::on_layer` not being called for `Box`ed `Layer`s,
+ which broke per-layer filtering ([#1576])
+
+### Added
+
+- **filter**: Added `Targets::iter`, returning an iterator over the set of
+ target-level pairs enabled by a `Targets` filter ([#1574])
+- **filter**: Added `IntoIterator` implementations for `Targets` and `&Targets`
+ ([#1574])
+
+Thanks to new contributor @connec for contributing to this release!
+
+[#1580]: https://github.com/tokio-rs/tracing/pull/1580
+[#1581]: https://github.com/tokio-rs/tracing/pull/1581
+[#1575]: https://github.com/tokio-rs/tracing/pull/1575
+[#1576]: https://github.com/tokio-rs/tracing/pull/1576
+[#1574]: https://github.com/tokio-rs/tracing/pull/1574
+
+# 0.2.23 (September 16, 2021)
+
+This release fixes a few bugs in the per-layer filtering API added in v0.2.21.
+
+### Fixed
+
+- **env-filter**: Fixed excessive `EnvFilter` memory use ([#1568])
+- **filter**: Fixed a panic that may occur in debug mode when using per-layer
+ filters together with global filters ([#1569])
+- Fixed incorrect documentation formatting ([#1572])
+
+[#1568]: https://github.com/tokio-rs/tracing/pull/1568
+[#1569]: https://github.com/tokio-rs/tracing/pull/1569
+[#1572]: https://github.com/tokio-rs/tracing/pull/1572
+
+# 0.2.22 (September 13, 2021)
+
+This fixes a regression where the `filter::ParseError` type was accidentally
+renamed.
+
+### Fixed
+
+- **filter**: Fix `filter::ParseError` accidentally being renamed to
+ `filter::DirectiveParseError` ([#1558])
+
+[#1558]: https://github.com/tokio-rs/tracing/pull/1558
+
+# 0.2.21 (September 12, 2021)
+
+This release introduces the [`Filter`] trait, a new API for [per-layer
+filtering][plf]. This allows controlling which spans and events are recorded by
+various layers individually, rather than globally.
+
+In addition, it adds a new [`Targets`] filter, which provides a lighter-weight
+version of the filtering provided by [`EnvFilter`], as well as other smaller API
+improvements and fixes.
+
+### Deprecated
+
+- **registry**: `SpanRef::parent_id`, which cannot properly support per-layer
+ filtering. Use `.parent().map(SpanRef::id)` instead. ([#1523])
+
+### Fixed
+
+- **layer** `Context` methods that are provided when the `Subscriber` implements
+ `LookupSpan` no longer require the "registry" feature flag ([#1525])
+- **layer** `fmt::Debug` implementation for `Layered` no longer requires the `S`
+ type parameter to implement `Debug` ([#1528])
+
+### Added
+
+- **registry**: `Filter` trait, `Filtered` type, `Layer::with_filter` method,
+ and other APIs for per-layer filtering ([#1523])
+- **filter**: `FilterFn` and `DynFilterFn` types that implement global (`Layer`)
+ and per-layer (`Filter`) filtering for closures and function pointers
+ ([#1523])
+- **filter**: `Targets` filter, which implements a lighter-weight form of
+ `EnvFilter`-like filtering ([#1550])
+- **env-filter**: Added support for filtering on floating-point values ([#1507])
+- **layer**: `Layer::on_layer` callback, called when layering the `Layer` onto a
+`Subscriber` ([#1523])
+- **layer**: `Layer` implementations for `Box<L>` and `Arc<L>` where `L: Layer`
+ ([#1536])
+- **layer**: `Layer` implementations for `Box<dyn Layer<S> + Send + Sync + 'static>`
+ and `Arc<dyn Layer<S> + Send + Sync + 'static>` ([#1536])
+- A number of small documentation fixes and improvements ([#1553], [#1544],
+ [#1539], [#1524])
+
+Special thanks to new contributors @jsgf and @maxburke for contributing to this
+release!
+
+[`Filter`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/layer/trait.Filter.html
+[plf]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/layer/index.html#per-layer-filtering
+[`Targets`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/filter/struct.Targets.html
+[`EnvFilter`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/filter/struct.EnvFilter.html
+[#1507]: https://github.com/tokio-rs/tracing/pull/1507
+[#1523]: https://github.com/tokio-rs/tracing/pull/1523
+[#1524]: https://github.com/tokio-rs/tracing/pull/1524
+[#1525]: https://github.com/tokio-rs/tracing/pull/1525
+[#1528]: https://github.com/tokio-rs/tracing/pull/1528
+[#1539]: https://github.com/tokio-rs/tracing/pull/1539
+[#1544]: https://github.com/tokio-rs/tracing/pull/1544
+[#1550]: https://github.com/tokio-rs/tracing/pull/1550
+[#1553]: https://github.com/tokio-rs/tracing/pull/1553
+
+# 0.2.20 (August 17, 2021)
+
+### Fixed
+
+- **fmt**: Fixed `fmt` printing only the first `source` for errors with a chain
+ of sources ([#1460])
+- **fmt**: Fixed missing space between level and event in the `Pretty` formatter
+ ([#1498])
+- **json**: Fixed `Json` formatter not honoring `without_time` and `with_level`
+ configurations ([#1463])
+
+### Added
+
+- **registry**: Improved panic message when cloning a span whose ID doesn't
+ exist, to aid in debugging issues with multiple subscribers ([#1483])
+- **registry**: Improved documentation on span ID generation ([#1453])
+
+[#1460]: https://github.com/tokio-rs/tracing/pull/1460
+[#1483]: https://github.com/tokio-rs/tracing/pull/1483
+[#1463]: https://github.com/tokio-rs/tracing/pull/1463
+[#1453]: https://github.com/tokio-rs/tracing/pull/1453
+[#1498]: https://github.com/tokio-rs/tracing/pull/1498
+
+Thanks to new contributors @joshtriplett and @lerouxrgd, and returning
+contributor @teozkr, for contributing to this release!
+
+# 0.2.19 (June 25, 2021)
+
+### Deprecated
+
+- **registry**: `SpanRef::parents`, `SpanRef::from_root`, and `Context::scope`
+ iterators, which are replaced by new `SpanRef::scope` and `Scope::from_root`
+ iterators ([#1413])
+
+### Added
+
+- **registry**: `SpanRef::scope` method, which returns a leaf-to-root `Iterator`
+ including the leaf span ([#1413])
+- **registry**: `Scope::from_root` method, which reverses the `scope` iterator
+ to iterate root-to-leaf ([#1413])
+- **registry**: `Context::event_span` method, which looks up the parent span of
+ an event ([#1434])
+- **registry**: `Context::event_scope` method, returning a `Scope` iterator over
+ the span scope of an event ([#1434])
+- **fmt**: `MakeWriter::make_writer_for` method, which allows returning a
+ different writer based on a span or event's metadata ([#1141])
+- **fmt**: `MakeWriterExt` trait, with `with_max_level`, `with_min_level`,
+ `with_filter`, `and`, and `or_else` combinators ([#1274])
+- **fmt**: `MakeWriter` implementation for `Arc<W> where &W: io::Write`
+ ([#1274])
+
+Thanks to @teozkr and @Folyd for contributing to this release!
+
+[#1413]: https://github.com/tokio-rs/tracing/pull/1413
+[#1434]: https://github.com/tokio-rs/tracing/pull/1434
+[#1141]: https://github.com/tokio-rs/tracing/pull/1141
+[#1274]: https://github.com/tokio-rs/tracing/pull/1274
+
+# 0.2.18 (April 30, 2021)
+
+### Deprecated
+
+- Deprecated the `CurrentSpan` type, which is inefficient and largely superseded
+ by the `registry` API ([#1321])
+
+### Fixed
+
+- **json**: Invalid JSON emitted for events in spans with no fields ([#1333])
+- **json**: Missing span data for synthesized new span, exit, and close events
+ ([#1334])
+- **fmt**: Extra space before log lines when timestamps are disabled ([#1355])
+
+### Added
+
+- **env-filter**: Support for filters on spans whose names contain any
+ characters other than `{` and `]` ([#1368])
+
+Thanks to @Folyd, and new contributors @akinnane and @aym-v for contributing to
+this release!
+
+[#1321]: https://github.com/tokio-rs/tracing/pull/1321
+[#1333]: https://github.com/tokio-rs/tracing/pull/1333
+[#1334]: https://github.com/tokio-rs/tracing/pull/1334
+[#1355]: https://github.com/tokio-rs/tracing/pull/1355
+[#1368]: https://github.com/tokio-rs/tracing/pull/1368
+
+# 0.2.17 (March 12, 2021)
+
+### Fixed
+
+- **fmt**: `Pretty` formatter now honors `with_ansi(false)` to disable ANSI
+ terminal formatting ([#1240])
+- **fmt**: Fixed extra padding when using `Pretty` formatter ([#1275])
+- **chrono**: Removed extra trailing space with `ChronoLocal` time formatter
+ ([#1103])
+
+### Added
+
+- **fmt**: Added `FmtContext::current_span()` method, returning the current span
+ ([#1290])
+- **fmt**: `FmtSpan` variants may now be combined using the `|` operator for
+ more granular control over what span events are generated ([#1277])
+
+Thanks to new contributors @cratelyn, @dignati, and @zicklag, as well as @Folyd,
+@matklad, and @najamelan, for contributing to this release!
+
+[#1240]: https://github.com/tokio-rs/tracing/pull/1240
+[#1275]: https://github.com/tokio-rs/tracing/pull/1275
+[#1103]: https://github.com/tokio-rs/tracing/pull/1103
+[#1290]: https://github.com/tokio-rs/tracing/pull/1290
+[#1277]: https://github.com/tokio-rs/tracing/pull/1277
+
+# 0.2.16 (February 19, 2021)
+
+### Fixed
+
+- **env-filter**: Fixed directives where the level is in mixed case (such as
+ `Info`) failing to parse ([#1126])
+- **fmt**: Fixed `fmt::Subscriber` not providing a max-level hint ([#1251])
+- `tracing-subscriber` no longer enables `tracing` and `tracing-core`'s default
+ features ([#1144])
+
+### Changed
+
+- **chrono**: Updated `chrono` dependency to 0.4.16 ([#1189])
+- **log**: Updated `tracing-log` dependency to 0.1.2
+
+Thanks to @salewski, @taiki-e, @davidpdrsn and @markdingram for contributing to
+this release!
+
+[#1126]: https://github.com/tokio-rs/tracing/pull/1126
+[#1251]: https://github.com/tokio-rs/tracing/pull/1251
+[#1144]: https://github.com/tokio-rs/tracing/pull/1144
+[#1189]: https://github.com/tokio-rs/tracing/pull/1189
+
+# 0.2.15 (November 2, 2020)
+
+### Fixed
+
+- **fmt**: Fixed wrong lifetime parameters on `FormatFields` impl for
+ `FmtContext` ([#1082])
+
+### Added
+
+- **fmt**: `format::Pretty`, an aesthetically pleasing, human-readable event
+ formatter for local development and user-facing CLIs ([#1080])
+- **fmt**: `FmtContext::field_format`, which returns the subscriber's field
+ formatter ([#1082])
+
+[#1082]: https://github.com/tokio-rs/tracing/pull/1082
+[#1080]: https://github.com/tokio-rs/tracing/pull/1080
+
+# 0.2.14 (October 22, 2020)
+
+### Fixed
+
+- **registry**: Fixed `Registry::new` allocating an excessively large amount of
+ memory, most of which would never be used ([#1064])
+
+### Changed
+
+- **registry**: Improved `new_span` performance by reusing `HashMap` allocations
+ for `Extensions` ([#1064])
+- **registry**: Significantly improved the performance of `Registry::enter` and
+ `Registry::exit` ([#1058])
+
+[#1064]: https://github.com/tokio-rs/tracing/pull/1064
+[#1058]: https://github.com/tokio-rs/tracing/pull/1058
+
+# 0.2.13 (October 7, 2020)
+
+### Changed
+
+- Updated `tracing-core` to 0.1.17 ([#992])
+
+### Added
+
+- **env-filter**: Added support for filtering on targets which contain dashes
+ ([#1014])
+- **env-filter**: Added a warning when creating an `EnvFilter` that contains
+ directives that would enable a level disabled by the `tracing` crate's
+ `static_max_level` features ([#1021])
+
+Thanks to @jyn514 and @bkchr for contributing to this release!
+
+[#992]: https://github.com/tokio-rs/tracing/pull/992
+[#1014]: https://github.com/tokio-rs/tracing/pull/1014
+[#1021]: https://github.com/tokio-rs/tracing/pull/1021
+
+# 0.2.12 (September 11, 2020)
+
+### Fixed
+
+- **env-filter**: Fixed a regression where `Option<Level>` lost its
+ `Into<LevelFilter>` impl ([#966])
+- **env-filter**: Fixed `EnvFilter` enabling spans that should not be enabled
+ when multiple subscribers are in use ([#927])
+
+### Changed
+
+- **json**: `format::Json` now outputs fields in a more readable order ([#892])
+- Updated `tracing-core` dependency to 0.1.16
+
+### Added
+
+- **fmt**: Add `BoxMakeWriter` for erasing the type of a `MakeWriter`
+ implementation ([#958])
+- **fmt**: Add `TestWriter` `MakeWriter` implementation to support libtest
+ output capturing ([#938])
+- **layer**: Add `Layer` impl for `Option<T> where T: Layer` ([#910])
+- **env-filter**: Add `From<Level>` impl for `Directive` ([#918])
+- Multiple documentation fixes and improvements
+
+Thanks to @Pothulapati, @samrg472, @bryanburgers, @keetonian, and @SriRamanujam
+for contributing to this release!
+
+[#927]: https://github.com/tokio-rs/tracing/pull/927
+[#966]: https://github.com/tokio-rs/tracing/pull/966
+[#958]: https://github.com/tokio-rs/tracing/pull/958
+[#892]: https://github.com/tokio-rs/tracing/pull/892
+[#938]: https://github.com/tokio-rs/tracing/pull/938
+[#910]: https://github.com/tokio-rs/tracing/pull/910
+[#918]: https://github.com/tokio-rs/tracing/pull/918
+
+# 0.2.11 (August 10, 2020)
+
+### Fixed
+
+- **env-filter**: Incorrect max level hint when filters involving span field
+ values are in use (#907)
+- **registry**: Fixed inconsistent span stacks when multiple registries are in
+ use on the same thread (#901)
+
+### Changed
+
+- **env-filter**: `regex` dependency enables fewer unused feature flags (#899)
+
+Thanks to @bdonlan and @jeromegn for contributing to this release!
+
+# 0.2.10 (July 31, 2020)
+
+### Fixed
+
+- **docs**: Incorrect formatting (#862)
+
+### Changed
+
+- **filter**: `LevelFilter` is now a re-export of the
+ `tracing_core::LevelFilter` type, it can now be used interchangably with the
+ versions in `tracing` and `tracing-core` (#853)
+- **filter**: Significant performance improvements when comparing `LevelFilter`s
+ and `Level`s (#853)
+- Updated the minimum `tracing-core` dependency to 0.1.12 (#853)
+
+### Added
+
+- **filter**: `LevelFilter` and `EnvFilter` now participate in `tracing-core`'s
+ max level hinting, improving performance significantly in some use cases where
+ levels are disabled globally (#853)
+
+# 0.2.9 (July 23, 2020)
+
+### Fixed
+
+- **fmt**: Fixed compilation failure on MSRV when the `chrono` feature is
+ disabled (#844)
+
+### Added
+
+- **fmt**: Span lookup methods defined by `layer::Context` are now also provided
+ by `FmtContext` (#834)
+
+# 0.2.8 (July 17, 2020)
+
+### Changed
+
+- **fmt**: When the `chrono` dependency is enabled, the `SystemTime` timestamp
+ formatter now emits human-readable timestamps rather than using `SystemTime`'s
+ `fmt::Debug`implementation (`chrono` is still required for customized
+ timestamp formatting) (#807)
+- **ansi**: Updated `ansi_term` dependency to 0.12 (#816)
+
+### Added
+
+- **json**: `with_span_list` method to configure the JSON formatter to include a
+ list of all spans in the current trace in formatting events (similarly to the
+ text formatter) (#741)
+- **json**: `with_current_span` method to configure the JSON formatter to include
+ a field for the _current_ span (the leaf of the trace) in formatted events
+ (#741)
+- **fmt**: `with_thread_names` and `with_thread_ids` methods to configure
+ `fmt::Subscriber`s and `fmt::Layer`s to include the thread name and/or thread ID
+ of the current thread when formatting events (#818)
+
+Thanks to new contributors @mockersf, @keetonian, and @Pothulapati for
+contributing to this release!
+
+# 0.2.7 (July 1, 2020)
+
+### Changed
+
+- **parking_lot**: Updated the optional `parking_lot` dependency to accept the
+ latest `parking_lot` version (#774)
+
+### Fixed
+
+- **fmt**: Fixed events with explicitly overridden parent spans being formatted
+ as though they were children of the current span (#767)
+
+### Added
+
+- **fmt**: Added the option to print synthesized events when spans are created,
+ entered, exited, and closed, including span durations (#761)
+- Documentation clarification and improvement (#762, #769)
+
+Thanks to @rkuhn, @greenwoodcm, and @Ralith for contributing to this release!
+
+# 0.2.6 (June 19, 2020)
+
+### Fixed
+
+- **fmt**: Fixed an issue in the JSON formatter where using `Span::record` would
+ result in malformed spans (#709)
+
+# 0.2.5 (April 21, 2020)
+
+### Changed
+
+- **fmt**: Bump sharded-slab dependency (#679)
+
+### Fixed
+
+- **fmt**: remove trailing space in `ChronoUtc` `format_time` (#677)
+
+# 0.2.4 (April 6, 2020)
+
+This release includes several API ergonomics improvements, including shorthand
+constructors for many types, and an extension trait for initializing subscribers
+using method-chaining style. Additionally, several bugs in less commonly used
+`fmt` APIs were fixed.
+
+### Added
+
+- **fmt**: Shorthand free functions for constructing most types in `fmt`
+ (including `tracing_subscriber::fmt()` to return a `SubscriberBuilder`,
+ `tracing_subscriber::fmt::layer()` to return a format `Layer`, etc) (#660)
+- **registry**: Shorthand free function `tracing_subscriber::registry()` to
+ construct a new registry (#660)
+- Added `SubscriberInitExt` extension trait for more ergonomic subscriber
+ initialization (#660)
+
+### Changed
+
+- **fmt**: Moved `LayerBuilder` methods to `Layer` (#655)
+
+### Deprecated
+
+- **fmt**: `LayerBuilder`, as `Layer` now implements all builder methods (#655)
+
+### Fixed
+
+- **fmt**: Fixed `Compact` formatter not omitting levels with
+ `with_level(false)` (#657)
+- **fmt**: Fixed `fmt::Layer` duplicating the fields for a new span if another
+ layer has already formatted its fields (#634)
+- **fmt**: Added missing space when using `record` to add new fields to a span
+ that already has fields (#659)
+- Updated outdated documentation (#647)
+
+
+# 0.2.3 (March 5, 2020)
+
+### Fixed
+
+- **env-filter**: Regression where filter directives were selected in the order
+ they were listed, rather than most specific first (#624)
+
+# 0.2.2 (February 27, 2020)
+
+### Added
+
+- **fmt**: Added `flatten_event` to `SubscriberBuilder` (#599)
+- **fmt**: Added `with_level` to `SubscriberBuilder` (#594)
+
+# 0.2.1 (February 13, 2020)
+
+### Changed
+
+- **filter**: `EnvFilter` directive selection now behaves correctly (i.e. like
+ `env_logger`) (#583)
+
+### Fixed
+
+- **filter**: Fixed `EnvFilter` incorrectly allowing less-specific filter
+ directives to enable events that are disabled by more-specific filters (#583)
+- **filter**: Multiple significant `EnvFilter` performance improvements,
+ especially when filtering events generated by `log` records (#578, #583)
+- **filter**: Replaced `BTreeMap` with `Vec` in `DirectiveSet`, improving
+ iteration performance significantly with typical numbers of filter directives
+ (#580)
+
+A big thank-you to @samschlegel for lots of help with `EnvFilter` performance
+tuning in this release!
+
+# 0.2.0 (February 4, 2020)
+
+### Breaking Changes
+
+- **fmt**: Renamed `Context` to `FmtContext` (#420, #425)
+- **fmt**: Renamed `Builder` to `SubscriberBuilder` (#420)
+- **filter**: Removed `Filter`. Use `EnvFilter` instead (#434)
+
+### Added
+
+- **registry**: `Registry`, a `Subscriber` implementation that `Layer`s can use
+ as a high-performance, in-memory span store. (#420, #425, #432, #433, #435)
+- **registry**: Added `LookupSpan` trait, implemented by `Subscriber`s to expose
+ stored span data to `Layer`s (#420)
+- **fmt**: Added `fmt::Layer`, to allow composing log formatting with other `Layer`s
+- **fmt**: Added support for JSON field and event formatting (#377, #415)
+- **filter**: Documentation for filtering directives (#554)
+
+### Changed
+
+- **fmt**: Renamed `Context` to `FmtContext` (#420, #425) (BREAKING)
+- **fmt**: Renamed `Builder` to `SubscriberBuilder` (#420) (BREAKING)
+- **fmt**: Reimplemented `fmt::Subscriber` in terms of the `Registry`
+ and `Layer`s (#420)
+
+### Removed
+
+- **filter**: Removed `Filter`. Use `EnvFilter` instead (#434) (BREAKING)
+
+### Fixed
+
+- **fmt**: Fixed memory leaks in the slab used to store per-span data
+ (3c35048)
+- **fmt**: `fmt::SubscriberBuilder::init` not setting up `log` compatibility
+ (#489)
+- **fmt**: Spans closed by a child span closing not also closing _their_
+ parents (#514)
+- **Layer**: Fixed `Layered` subscribers failing to downcast to their own type
+ (#549)
+- **Layer**: Fixed `Layer::downcast_ref` returning invalid references (#454)
+
+# 0.2.0-alpha.6 (February 3, 2020)
+
+### Fixed
+
+- **fmt**: Fixed empty `{}` printed after spans with no fields (f079f2d)
+- **fmt**: Fixed inconsistent formatting when ANSI colors are disabled (506a482)
+- **fmt**: Fixed mis-aligned levels when ANSI colors are disabled (eba1adb)
+- Fixed warnings on nightly Rust compilers (#558)
+
+# 0.2.0-alpha.5 (January 31, 2020)
+
+### Added
+
+- **env_filter**: Documentation for filtering directives (#554)
+- **registry**, **env_filter**: Updated `smallvec` dependency to 0.1 (#543)
+
+### Fixed
+
+- **registry**: Fixed a memory leak in the slab used to store per-span data
+ (3c35048)
+- **Layer**: Fixed `Layered` subscribers failing to downcast to their own type
+ (#549)
+- **fmt**: Fixed a panic when multiple layers insert `FormattedFields`
+ extensions from the same formatter type (1c3bb70)
+- **fmt**: Fixed `fmt::Layer::on_record` inserting a new `FormattedFields` when
+ formatted fields for a span already exist (1c3bb70)
+
+# 0.2.0-alpha.4 (January 11, 2020)
+
+### Fixed
+
+- **registry**: Removed inadvertently committed `dbg!` macros (#533)
+
+# 0.2.0-alpha.3 (January 10, 2020)
+
+### Added
+
+- **fmt**: Public `FormattedFields::new` constructor (#478)
+- **fmt**: Added examples to `fmt::Layer` documentation (#510)
+- Documentation now shows what feature flags are required by each API item (#525)
+
+### Fixed
+
+- **fmt**: Missing space between timestamp and level (#480)
+- **fmt**: Incorrect formatting with `with_target(false)` (#481)
+- **fmt**: `fmt::SubscriberBuilder::init` not setting up `log` compatibility
+ (#489)
+- **registry**: Spans exited out of order not being closed properly on exit
+ (#509)
+- **registry**: Memory leak when spans are closed by a child span closing (#514)
+- **registry**: Spans closed by a child span closing not also closing _their_
+ parents (#514)
+- Compilation errors with `no-default-features` (#499, #500)
+
+# 0.2.0-alpha.2 (December 8, 2019)
+
+### Added
+
+- `LookupSpans` implementation for `Layered` (#448)
+- `SpanRef::from_root` to iterate over a span's parents from the root (#460)
+- `Context::scope`, to iterate over the current context from the root (#460)
+- `Context::lookup_current`, which returns a `SpanRef` to the current
+ span's data (#460)
+
+### Changed
+
+- Lifetimes on some new `Context` methods to be less restrictive (#460)
+
+### Fixed
+
+- `Layer::downcast_ref` returning invalid references (#454)
+- Compilation failure on 32-bit platforms (#462)
+- Compilation failure with ANSI formatters (#438)
+
+# 0.2.0-alpha.1 (November 18, 2019)
+
+### Added
+
+- `Registry`, a reusable span store that `Layer`s can use a
+ high-performance, in-memory store. (#420, #425, #432, #433, #435)
+- Reimplemented `fmt::Subscriber` in terms of the `Registry`
+ and `Layer`s (#420)
+- Add benchmarks for fmt subscriber (#421)
+- Add support for JSON field and event formatting (#377, #415)
+
+### Changed
+
+- **BREAKING**: Change `fmt::format::FormatFields` and
+ `fmt::format::FormatEvent` to accept a mandatory `FmtContext`. These
+ `FormatFields` and `FormatEvent` will likely see additional breaking
+ changes in subsequent alpha. (#420, #425)
+- **BREAKING**: Removed `Filter`. Use `EnvFilter` instead (#434)
+
+### Contributers
+
+Thanks to all the contributers to this release!
+
+- @pimeys for #377 and #415
+
+# 0.1.6 (October 29, 2019)
+
+### Added
+
+- Add `init` and `try_init` functions to `FmtSubscriber` (#385)
+- Add `ChronoUtc` and `ChronoLocal` timers, RFC 3339 support (#387)
+- Add `tracing::subscriber::set_default` which sets the default
+ subscriber and returns a drop guard. This drop guard will reset the
+ dispatch on drop (#388).
+
+### Fixed
+
+- Fix default level for `EnvFilter`. Setting `RUST_LOG=target`
+ previously only the `ERROR` level, while it should enable everything.
+ `tracing-subscriber` now defaults to `TRACE` if no level is specified
+ (#401)
+- Fix `tracing-log` feature flag for init + try_init. The feature flag
+ `tracing_log` was used instead of the correct `tracing-log`. As a
+ result, both `tracing-log` and `tracing_log` needed to be specified in
+ order to initialize the global logger. Only `tracing-log` needs to be
+ specified now (#400).
+
+### Contributers
+
+Thanks to all the contributers to this release!
+
+- @emschwartz for #385, #387, #400 and #401
+- @bIgBV for #388
+
+# 0.1.5 (October 7, 2019)
+
+### Fixed
+
+- Spans not being closed properly when `FmtSubscriber::current_span` is used
+ (#371)
+
+# 0.1.4 (September 26, 2019)
+
+### Fixed
+
+- Spans entered twice on the same thread sometimes being completely exited when
+ the more deeply-nested entry is exited (#361)
+- Setting `with_ansi(false)` on `FmtSubscriber` not disabling ANSI color
+ formatting for timestamps (#354)
+- Incorrect reference counting in `FmtSubscriber` that could cause spans to not
+ be closed when all references are dropped (#366)
+
+# 0.1.3 (September 16, 2019)
+
+### Fixed
+
+- `Layered` subscribers not properly forwarding calls to `current_span`
+ (#350)
+
+# 0.1.2 (September 12, 2019)
+
+### Fixed
+
+- `EnvFilter` ignoring directives with targets that are the same number of
+ characters (#333)
+- `EnvFilter` failing to properly apply filter directives to events generated
+ from `log` records by`tracing-log` (#344)
+
+### Changed
+
+- Renamed `Filter` to `EnvFilter`, deprecated `Filter` (#339)
+- Renamed "filter" feature flag to "env-filter", deprecated "filter" (#339)
+- `FmtSubscriber` now defaults to enabling only the `INFO` level and above when
+ a max level filter or `EnvFilter` is not set (#336)
+- Made `parking_lot` dependency an opt-in feature flag (#348)
+
+### Added
+
+- `EnvFilter::add_directive` to add new directives to filters after they are
+ constructed (#334)
+- `fmt::Builder::with_max_level` to set a global level filter for a
+ `FmtSubscriber` without requiring the use of `EnvFilter` (#336)
+- `Layer` implementation for `LevelFilter` (#336)
+- `EnvFilter` now implements `fmt::Display` (#329)
+
+### Removed
+
+- Removed dependency on `crossbeam-util` (#348)
+
+# 0.1.1 (September 4, 2019)
+
+### Fixed
+
+- Potential double panic in `CurrentSpan` (#325)
+
+# 0.1.0 (September 3, 2019)
+
+- Initial release
diff --git a/vendor/tracing-subscriber-0.3.3/Cargo.toml b/vendor/tracing-subscriber-0.3.3/Cargo.toml
new file mode 100644
index 000000000..b5e7ba7db
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/Cargo.toml
@@ -0,0 +1,150 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+rust-version = "1.42.0"
+name = "tracing-subscriber"
+version = "0.3.3"
+authors = ["Eliza Weisman <eliza@buoyant.io>", "David Barsky <me@davidbarsky.com>", "Tokio Contributors <team@tokio.rs>"]
+description = "Utilities for implementing and composing `tracing` subscribers.\n"
+homepage = "https://tokio.rs"
+readme = "README.md"
+keywords = ["logging", "tracing", "metrics", "subscriber"]
+categories = ["development-tools::debugging", "development-tools::profiling", "asynchronous"]
+license = "MIT"
+repository = "https://github.com/tokio-rs/tracing"
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]
+
+[[bench]]
+name = "filter"
+harness = false
+
+[[bench]]
+name = "filter_log"
+harness = false
+
+[[bench]]
+name = "fmt"
+harness = false
+
+[[bench]]
+name = "enter"
+harness = false
+[dependencies.ansi_term]
+version = "0.12"
+optional = true
+
+[dependencies.lazy_static]
+version = "1"
+optional = true
+
+[dependencies.matchers]
+version = "0.1.0"
+optional = true
+
+[dependencies.parking_lot]
+version = ">= 0.7, <= 0.11"
+optional = true
+
+[dependencies.regex]
+version = "1"
+features = ["std"]
+optional = true
+default-features = false
+
+[dependencies.serde]
+version = "1.0"
+optional = true
+
+[dependencies.serde_json]
+version = "1.0"
+optional = true
+
+[dependencies.sharded-slab]
+version = "0.1.0"
+optional = true
+
+[dependencies.smallvec]
+version = "1"
+optional = true
+
+[dependencies.thread_local]
+version = "1.0.1"
+optional = true
+
+[dependencies.time]
+version = "0.3"
+features = ["formatting"]
+optional = true
+
+[dependencies.tracing]
+version = "0.1"
+optional = true
+default-features = false
+
+[dependencies.tracing-core]
+version = "0.1.20"
+
+[dependencies.tracing-log]
+version = "0.1.2"
+features = ["log-tracer", "std"]
+optional = true
+default-features = false
+
+[dependencies.tracing-serde]
+version = "0.1.2"
+optional = true
+[dev-dependencies.criterion]
+version = "0.3"
+default_features = false
+
+[dev-dependencies.log]
+version = "0.4"
+
+[dev-dependencies.regex]
+version = "1"
+features = ["std"]
+default-features = false
+
+[dev-dependencies.time]
+version = "0.3"
+features = ["formatting", "macros"]
+
+[dev-dependencies.tokio]
+version = "0.2"
+features = ["rt-core", "macros"]
+
+[dev-dependencies.tracing]
+version = "0.1"
+
+[dev-dependencies.tracing-futures]
+version = "0.2"
+features = ["std-future", "std"]
+default-features = false
+
+[dev-dependencies.tracing-log]
+version = "0.1.2"
+
+[features]
+alloc = []
+ansi = ["fmt", "ansi_term"]
+default = ["smallvec", "fmt", "ansi", "tracing-log", "std"]
+env-filter = ["matchers", "regex", "lazy_static", "tracing", "std"]
+fmt = ["registry", "std"]
+json = ["tracing-serde", "serde", "serde_json"]
+local-time = ["time/local-offset"]
+registry = ["sharded-slab", "thread_local", "std"]
+std = ["alloc", "tracing-core/std"]
+[badges.maintenance]
+status = "experimental"
diff --git a/vendor/tracing-subscriber-0.3.3/LICENSE b/vendor/tracing-subscriber-0.3.3/LICENSE
new file mode 100644
index 000000000..cdb28b4b5
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/LICENSE
@@ -0,0 +1,25 @@
+Copyright (c) 2019 Tokio Contributors
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/vendor/tracing-subscriber-0.3.3/README.md b/vendor/tracing-subscriber-0.3.3/README.md
new file mode 100644
index 000000000..75c62e8ca
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/README.md
@@ -0,0 +1,61 @@
+![Tracing — Structured, application-level diagnostics][splash]
+
+[splash]: https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/splash.svg
+
+# tracing-subscriber
+
+Utilities for implementing and composing [`tracing`][tracing] subscribers.
+
+[![Crates.io][crates-badge]][crates-url]
+[![Documentation][docs-badge]][docs-url]
+[![Documentation (master)][docs-master-badge]][docs-master-url]
+[![MIT licensed][mit-badge]][mit-url]
+[![Build Status][actions-badge]][actions-url]
+[![Discord chat][discord-badge]][discord-url]
+![maintenance status][maint-badge]
+
+[Documentation][docs-url] | [Chat][discord-url]
+
+[tracing]: https://github.com/tokio-rs/tracing/tree/master/tracing
+[tracing-fmt]: https://github.com/tokio-rs/tracing/tree/master/tracing-subscriber
+[crates-badge]: https://img.shields.io/crates/v/tracing-subscriber.svg
+[crates-url]: https://crates.io/crates/tracing-subscriber
+[docs-badge]: https://docs.rs/tracing-subscriber/badge.svg
+[docs-url]: https://docs.rs/tracing-subscriber/0.3.1
+[docs-master-badge]: https://img.shields.io/badge/docs-master-blue
+[docs-master-url]: https://tracing-rs.netlify.com/tracing_subscriber
+[mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
+[mit-url]: LICENSE
+[actions-badge]: https://github.com/tokio-rs/tracing/workflows/CI/badge.svg
+[actions-url]:https://github.com/tokio-rs/tracing/actions?query=workflow%3ACI
+[discord-badge]: https://img.shields.io/discord/500028886025895936?logo=discord&label=discord&logoColor=white
+[discord-url]: https://discord.gg/EeF3cQw
+[maint-badge]: https://img.shields.io/badge/maintenance-experimental-blue.svg
+
+*Compiler support: [requires `rustc` 1.42+][msrv]*
+
+[msrv]: #supported-rust-versions
+
+## Supported Rust Versions
+
+Tracing is built against the latest stable release. The minimum supported
+version is 1.42. The current Tracing version is not guaranteed to build on Rust
+versions earlier than the minimum supported version.
+
+Tracing follows the same compiler support policies as the rest of the Tokio
+project. The current stable Rust compiler and the three most recent minor
+versions before it will always be supported. For example, if the current stable
+compiler version is 1.45, the minimum supported version will not be increased
+past 1.42, three minor versions prior. Increasing the minimum supported compiler
+version is not considered a semver breaking change as long as doing so complies
+with this policy.
+
+## License
+
+This project is licensed under the [MIT license](LICENSE).
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in Tracing by you, shall be licensed as MIT, without any additional
+terms or conditions.
diff --git a/vendor/tracing-subscriber-0.3.3/benches/enter.rs b/vendor/tracing-subscriber-0.3.3/benches/enter.rs
new file mode 100644
index 000000000..49c6e730a
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/benches/enter.rs
@@ -0,0 +1,64 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use tracing_subscriber::prelude::*;
+
+fn enter(c: &mut Criterion) {
+ let mut group = c.benchmark_group("enter");
+ let _subscriber = tracing_subscriber::fmt()
+ .with_max_level(tracing::Level::INFO)
+ .finish()
+ .set_default();
+ group.bench_function("enabled", |b| {
+ let span = tracing::info_span!("foo");
+ b.iter_with_large_drop(|| span.enter())
+ });
+ group.bench_function("disabled", |b| {
+ let span = tracing::debug_span!("foo");
+ b.iter_with_large_drop(|| span.enter())
+ });
+}
+
+fn enter_exit(c: &mut Criterion) {
+ let mut group = c.benchmark_group("enter_exit");
+ let _subscriber = tracing_subscriber::fmt()
+ .with_max_level(tracing::Level::INFO)
+ .finish()
+ .set_default();
+ group.bench_function("enabled", |b| {
+ let span = tracing::info_span!("foo");
+ b.iter(|| span.enter())
+ });
+ group.bench_function("disabled", |b| {
+ let span = tracing::debug_span!("foo");
+ b.iter(|| span.enter())
+ });
+}
+
+fn enter_many(c: &mut Criterion) {
+ let mut group = c.benchmark_group("enter_many");
+ let _subscriber = tracing_subscriber::fmt()
+ .with_max_level(tracing::Level::INFO)
+ .finish()
+ .set_default();
+ group.bench_function("enabled", |b| {
+ let span1 = tracing::info_span!("span1");
+ let _e1 = span1.enter();
+ let span2 = tracing::info_span!("span2");
+ let _e2 = span2.enter();
+ let span3 = tracing::info_span!("span3");
+ let _e3 = span3.enter();
+ let span = tracing::info_span!("foo");
+ b.iter_with_large_drop(|| span.enter())
+ });
+ group.bench_function("disabled", |b| {
+ let span1 = tracing::info_span!("span1");
+ let _e1 = span1.enter();
+ let span2 = tracing::info_span!("span2");
+ let _e2 = span2.enter();
+ let span3 = tracing::info_span!("span3");
+ let _e3 = span3.enter();
+ let span = tracing::debug_span!("foo");
+ b.iter_with_large_drop(|| span.enter())
+ });
+}
+criterion_group!(benches, enter, enter_exit, enter_many);
+criterion_main!(benches);
diff --git a/vendor/tracing-subscriber-0.3.3/benches/filter.rs b/vendor/tracing-subscriber-0.3.3/benches/filter.rs
new file mode 100644
index 000000000..91ab9c91d
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/benches/filter.rs
@@ -0,0 +1,308 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use std::time::Duration;
+use tracing::{dispatcher::Dispatch, span, Event, Id, Metadata};
+use tracing_subscriber::{prelude::*, EnvFilter};
+
+mod support;
+use support::MultithreadedBench;
+
+/// A subscriber that is enabled but otherwise does nothing.
+struct EnabledSubscriber;
+
+impl tracing::Subscriber for EnabledSubscriber {
+ fn new_span(&self, span: &span::Attributes<'_>) -> Id {
+ let _ = span;
+ Id::from_u64(0xDEAD_FACE)
+ }
+
+ fn event(&self, event: &Event<'_>) {
+ let _ = event;
+ }
+
+ fn record(&self, span: &Id, values: &span::Record<'_>) {
+ let _ = (span, values);
+ }
+
+ fn record_follows_from(&self, span: &Id, follows: &Id) {
+ let _ = (span, follows);
+ }
+
+ fn enabled(&self, metadata: &Metadata<'_>) -> bool {
+ let _ = metadata;
+ true
+ }
+
+ fn enter(&self, span: &Id) {
+ let _ = span;
+ }
+
+ fn exit(&self, span: &Id) {
+ let _ = span;
+ }
+}
+
+fn bench_static(c: &mut Criterion) {
+ let mut group = c.benchmark_group("static");
+
+ group.bench_function("baseline_single_threaded", |b| {
+ tracing::subscriber::with_default(EnabledSubscriber, || {
+ b.iter(|| {
+ tracing::info!(target: "static_filter", "hi");
+ tracing::debug!(target: "static_filter", "hi");
+ tracing::warn!(target: "static_filter", "hi");
+ tracing::trace!(target: "foo", "hi");
+ })
+ });
+ });
+ group.bench_function("single_threaded", |b| {
+ let filter = "static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ tracing::info!(target: "static_filter", "hi");
+ tracing::debug!(target: "static_filter", "hi");
+ tracing::warn!(target: "static_filter", "hi");
+ tracing::trace!(target: "foo", "hi");
+ })
+ });
+ });
+ group.bench_function("enabled_one", |b| {
+ let filter = "static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ tracing::info!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("enabled_many", |b| {
+ let filter = "foo=debug,bar=trace,baz=error,quux=warn,static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ tracing::info!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("disabled_level_one", |b| {
+ let filter = "static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ tracing::debug!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("disabled_level_many", |b| {
+ let filter = "foo=debug,bar=info,baz=error,quux=warn,static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ tracing::trace!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("disabled_one", |b| {
+ let filter = "foo=info".parse::<EnvFilter>().expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ tracing::info!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("disabled_many", |b| {
+ let filter = "foo=debug,bar=trace,baz=error,quux=warn,whibble=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ tracing::info!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("baseline_multithreaded", |b| {
+ let dispatch = Dispatch::new(EnabledSubscriber);
+ b.iter_custom(|iters| {
+ let mut total = Duration::from_secs(0);
+ for _ in 0..iters {
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let elapsed = bench
+ .thread(|| {
+ tracing::info!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ tracing::debug!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ tracing::warn!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ tracing::warn!(target: "foo", "hi");
+ })
+ .run();
+ total += elapsed;
+ }
+ total
+ })
+ });
+ group.bench_function("multithreaded", |b| {
+ let filter = "static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ let dispatch = Dispatch::new(EnabledSubscriber.with(filter));
+ b.iter_custom(|iters| {
+ let mut total = Duration::from_secs(0);
+ for _ in 0..iters {
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let elapsed = bench
+ .thread(|| {
+ tracing::info!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ tracing::debug!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ tracing::warn!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ tracing::warn!(target: "foo", "hi");
+ })
+ .run();
+ total += elapsed;
+ }
+ total
+ });
+ });
+ group.finish();
+}
+
+fn bench_dynamic(c: &mut Criterion) {
+ let mut group = c.benchmark_group("dynamic");
+
+ group.bench_function("baseline_single_threaded", |b| {
+ tracing::subscriber::with_default(EnabledSubscriber, || {
+ b.iter(|| {
+ tracing::info_span!("foo").in_scope(|| {
+ tracing::info!("hi");
+ tracing::debug!("hi");
+ });
+ tracing::info_span!("bar").in_scope(|| {
+ tracing::warn!("hi");
+ });
+ tracing::trace!("hi");
+ })
+ });
+ });
+ group.bench_function("single_threaded", |b| {
+ let filter = "[foo]=trace".parse::<EnvFilter>().expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ tracing::info_span!("foo").in_scope(|| {
+ tracing::info!("hi");
+ tracing::debug!("hi");
+ });
+ tracing::info_span!("bar").in_scope(|| {
+ tracing::warn!("hi");
+ });
+ tracing::trace!("hi");
+ })
+ });
+ });
+ group.bench_function("baseline_multithreaded", |b| {
+ let dispatch = Dispatch::new(EnabledSubscriber);
+ b.iter_custom(|iters| {
+ let mut total = Duration::from_secs(0);
+ for _ in 0..iters {
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let elapsed = bench
+ .thread(|| {
+ let span = tracing::info_span!("foo");
+ let _ = span.enter();
+ tracing::info!("hi");
+ })
+ .thread(|| {
+ let span = tracing::info_span!("foo");
+ let _ = span.enter();
+ tracing::debug!("hi");
+ })
+ .thread(|| {
+ let span = tracing::info_span!("bar");
+ let _ = span.enter();
+ tracing::debug!("hi");
+ })
+ .thread(|| {
+ tracing::trace!("hi");
+ })
+ .run();
+ total += elapsed;
+ }
+ total
+ })
+ });
+ group.bench_function("multithreaded", |b| {
+ let filter = "[foo]=trace".parse::<EnvFilter>().expect("should parse");
+ let dispatch = Dispatch::new(EnabledSubscriber.with(filter));
+ b.iter_custom(|iters| {
+ let mut total = Duration::from_secs(0);
+ for _ in 0..iters {
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let elapsed = bench
+ .thread(|| {
+ let span = tracing::info_span!("foo");
+ let _ = span.enter();
+ tracing::info!("hi");
+ })
+ .thread(|| {
+ let span = tracing::info_span!("foo");
+ let _ = span.enter();
+ tracing::debug!("hi");
+ })
+ .thread(|| {
+ let span = tracing::info_span!("bar");
+ let _ = span.enter();
+ tracing::debug!("hi");
+ })
+ .thread(|| {
+ tracing::trace!("hi");
+ })
+ .run();
+ total += elapsed;
+ }
+ total
+ })
+ });
+
+ group.finish();
+}
+
+fn bench_mixed(c: &mut Criterion) {
+ let mut group = c.benchmark_group("mixed");
+ group.bench_function("disabled", |b| {
+ let filter = "[foo]=trace,bar[quux]=debug,[{baz}]=debug,asdf=warn,wibble=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ tracing::info!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("disabled_by_level", |b| {
+ let filter = "[foo]=info,bar[quux]=debug,asdf=warn,static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ tracing::trace!(target: "static_filter", "hi");
+ })
+ });
+ });
+}
+
+criterion_group!(benches, bench_static, bench_dynamic, bench_mixed);
+criterion_main!(benches);
diff --git a/vendor/tracing-subscriber-0.3.3/benches/filter_log.rs b/vendor/tracing-subscriber-0.3.3/benches/filter_log.rs
new file mode 100644
index 000000000..4dcf3b4ec
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/benches/filter_log.rs
@@ -0,0 +1,315 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use std::time::Duration;
+use tracing::{dispatcher::Dispatch, span, Event, Id, Metadata};
+use tracing_subscriber::{prelude::*, EnvFilter};
+
+mod support;
+use support::MultithreadedBench;
+
+/// A subscriber that is enabled but otherwise does nothing.
+struct EnabledSubscriber;
+
+impl tracing::Subscriber for EnabledSubscriber {
+ fn new_span(&self, span: &span::Attributes<'_>) -> Id {
+ let _ = span;
+ Id::from_u64(0xDEAD_FACE)
+ }
+
+ fn event(&self, event: &Event<'_>) {
+ let _ = event;
+ }
+
+ fn record(&self, span: &Id, values: &span::Record<'_>) {
+ let _ = (span, values);
+ }
+
+ fn record_follows_from(&self, span: &Id, follows: &Id) {
+ let _ = (span, follows);
+ }
+
+ fn enabled(&self, metadata: &Metadata<'_>) -> bool {
+ let _ = metadata;
+ true
+ }
+
+ fn enter(&self, span: &Id) {
+ let _ = span;
+ }
+
+ fn exit(&self, span: &Id) {
+ let _ = span;
+ }
+}
+
+fn bench_static(c: &mut Criterion) {
+ let _ = tracing_log::LogTracer::init();
+
+ let mut group = c.benchmark_group("log/static");
+
+ group.bench_function("baseline_single_threaded", |b| {
+ tracing::subscriber::with_default(EnabledSubscriber, || {
+ b.iter(|| {
+ log::info!(target: "static_filter", "hi");
+ log::debug!(target: "static_filter", "hi");
+ log::warn!(target: "static_filter", "hi");
+ log::trace!(target: "foo", "hi");
+ })
+ });
+ });
+ group.bench_function("single_threaded", |b| {
+ let filter = "static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ log::info!(target: "static_filter", "hi");
+ log::debug!(target: "static_filter", "hi");
+ log::warn!(target: "static_filter", "hi");
+ log::trace!(target: "foo", "hi");
+ })
+ });
+ });
+ group.bench_function("enabled_one", |b| {
+ let filter = "static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ log::info!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("enabled_many", |b| {
+ let filter = "foo=debug,bar=trace,baz=error,quux=warn,static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ log::info!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("disabled_level_one", |b| {
+ let filter = "static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ log::debug!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("disabled_level_many", |b| {
+ let filter = "foo=debug,bar=info,baz=error,quux=warn,static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ log::trace!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("disabled_one", |b| {
+ let filter = "foo=info".parse::<EnvFilter>().expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ log::info!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("disabled_many", |b| {
+ let filter = "foo=debug,bar=trace,baz=error,quux=warn,whibble=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ log::info!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("baseline_multithreaded", |b| {
+ let dispatch = Dispatch::new(EnabledSubscriber);
+ b.iter_custom(|iters| {
+ let mut total = Duration::from_secs(0);
+ for _ in 0..iters {
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let elapsed = bench
+ .thread(|| {
+ log::info!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ log::debug!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ log::warn!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ log::warn!(target: "foo", "hi");
+ })
+ .run();
+ total += elapsed;
+ }
+ total
+ })
+ });
+ group.bench_function("multithreaded", |b| {
+ let filter = "static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ let dispatch = Dispatch::new(EnabledSubscriber.with(filter));
+ b.iter_custom(|iters| {
+ let mut total = Duration::from_secs(0);
+ for _ in 0..iters {
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let elapsed = bench
+ .thread(|| {
+ log::info!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ log::debug!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ log::warn!(target: "static_filter", "hi");
+ })
+ .thread(|| {
+ log::warn!(target: "foo", "hi");
+ })
+ .run();
+ total += elapsed;
+ }
+ total
+ });
+ });
+ group.finish();
+}
+
+fn bench_dynamic(c: &mut Criterion) {
+ let _ = tracing_log::LogTracer::init();
+
+ let mut group = c.benchmark_group("log/dynamic");
+
+ group.bench_function("baseline_single_threaded", |b| {
+ tracing::subscriber::with_default(EnabledSubscriber, || {
+ b.iter(|| {
+ tracing::info_span!("foo").in_scope(|| {
+ log::info!("hi");
+ log::debug!("hi");
+ });
+ tracing::info_span!("bar").in_scope(|| {
+ log::warn!("hi");
+ });
+ log::trace!("hi");
+ })
+ });
+ });
+ group.bench_function("single_threaded", |b| {
+ let filter = "[foo]=trace".parse::<EnvFilter>().expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ tracing::info_span!("foo").in_scope(|| {
+ log::info!("hi");
+ log::debug!("hi");
+ });
+ tracing::info_span!("bar").in_scope(|| {
+ log::warn!("hi");
+ });
+ log::trace!("hi");
+ })
+ });
+ });
+ group.bench_function("baseline_multithreaded", |b| {
+ let dispatch = Dispatch::new(EnabledSubscriber);
+ b.iter_custom(|iters| {
+ let mut total = Duration::from_secs(0);
+ for _ in 0..iters {
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let elapsed = bench
+ .thread(|| {
+ let span = tracing::info_span!("foo");
+ let _ = span.enter();
+ log::info!("hi");
+ })
+ .thread(|| {
+ let span = tracing::info_span!("foo");
+ let _ = span.enter();
+ log::debug!("hi");
+ })
+ .thread(|| {
+ let span = tracing::info_span!("bar");
+ let _ = span.enter();
+ log::debug!("hi");
+ })
+ .thread(|| {
+ log::trace!("hi");
+ })
+ .run();
+ total += elapsed;
+ }
+ total
+ })
+ });
+ group.bench_function("multithreaded", |b| {
+ let filter = "[foo]=trace".parse::<EnvFilter>().expect("should parse");
+ let dispatch = Dispatch::new(EnabledSubscriber.with(filter));
+ b.iter_custom(|iters| {
+ let mut total = Duration::from_secs(0);
+ for _ in 0..iters {
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let elapsed = bench
+ .thread(|| {
+ let span = tracing::info_span!("foo");
+ let _ = span.enter();
+ log::info!("hi");
+ })
+ .thread(|| {
+ let span = tracing::info_span!("foo");
+ let _ = span.enter();
+ log::debug!("hi");
+ })
+ .thread(|| {
+ let span = tracing::info_span!("bar");
+ let _ = span.enter();
+ log::debug!("hi");
+ })
+ .thread(|| {
+ log::trace!("hi");
+ })
+ .run();
+ total += elapsed;
+ }
+ total
+ })
+ });
+
+ group.finish();
+}
+
+fn bench_mixed(c: &mut Criterion) {
+ let _ = tracing_log::LogTracer::init();
+
+ let mut group = c.benchmark_group("log/mixed");
+
+ group.bench_function("disabled", |b| {
+ let filter = "[foo]=trace,bar[quux]=debug,[{baz}]=debug,asdf=warn,wibble=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ log::info!(target: "static_filter", "hi");
+ })
+ });
+ });
+ group.bench_function("disabled_by_level", |b| {
+ let filter = "[foo]=info,bar[quux]=debug,asdf=warn,static_filter=info"
+ .parse::<EnvFilter>()
+ .expect("should parse");
+ tracing::subscriber::with_default(EnabledSubscriber.with(filter), || {
+ b.iter(|| {
+ log::trace!(target: "static_filter", "hi");
+ })
+ });
+ });
+}
+
+criterion_group!(benches, bench_static, bench_dynamic, bench_mixed);
+criterion_main!(benches);
diff --git a/vendor/tracing-subscriber-0.3.3/benches/fmt.rs b/vendor/tracing-subscriber-0.3.3/benches/fmt.rs
new file mode 100644
index 000000000..a039e66d4
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/benches/fmt.rs
@@ -0,0 +1,331 @@
+use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
+use std::{io, time::Duration};
+
+mod support;
+use support::MultithreadedBench;
+
+/// A fake writer that doesn't actually do anything.
+///
+/// We want to measure the subscriber's overhead, *not* the performance of
+/// stdout/file writers. Using a no-op Write implementation lets us only measure
+/// the subscriber's overhead.
+struct NoWriter;
+
+impl io::Write for NoWriter {
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ Ok(buf.len())
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ Ok(())
+ }
+}
+
+impl NoWriter {
+ fn new() -> Self {
+ Self
+ }
+}
+
+fn bench_new_span(c: &mut Criterion) {
+ bench_thrpt(c, "new_span", |group, i| {
+ group.bench_with_input(BenchmarkId::new("single_thread", i), i, |b, &i| {
+ tracing::dispatcher::with_default(&mk_dispatch(), || {
+ b.iter(|| {
+ for n in 0..i {
+ let _span = tracing::info_span!("span", n);
+ }
+ })
+ });
+ });
+ group.bench_with_input(BenchmarkId::new("multithreaded", i), i, |b, &i| {
+ b.iter_custom(|iters| {
+ let mut total = Duration::from_secs(0);
+ let dispatch = mk_dispatch();
+ for _ in 0..iters {
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let elapsed = bench
+ .thread(move || {
+ for n in 0..i {
+ let _span = tracing::info_span!("span", n);
+ }
+ })
+ .thread(move || {
+ for n in 0..i {
+ let _span = tracing::info_span!("span", n);
+ }
+ })
+ .thread(move || {
+ for n in 0..i {
+ let _span = tracing::info_span!("span", n);
+ }
+ })
+ .thread(move || {
+ for n in 0..i {
+ let _span = tracing::info_span!("span", n);
+ }
+ })
+ .run();
+ total += elapsed;
+ }
+ total
+ })
+ });
+ });
+}
+
+type Group<'a> = criterion::BenchmarkGroup<'a, criterion::measurement::WallTime>;
+fn bench_thrpt(c: &mut Criterion, name: &'static str, mut f: impl FnMut(&mut Group<'_>, &usize)) {
+ const N_SPANS: &[usize] = &[1, 10, 50];
+
+ let mut group = c.benchmark_group(name);
+ for spans in N_SPANS {
+ group.throughput(Throughput::Elements(*spans as u64));
+ f(&mut group, spans);
+ }
+ group.finish();
+}
+
+fn mk_dispatch() -> tracing::Dispatch {
+ let subscriber = tracing_subscriber::FmtSubscriber::builder()
+ .with_writer(NoWriter::new)
+ .finish();
+ tracing::Dispatch::new(subscriber)
+}
+
+fn bench_event(c: &mut Criterion) {
+ bench_thrpt(c, "event", |group, i| {
+ group.bench_with_input(BenchmarkId::new("root/single_threaded", i), i, |b, &i| {
+ let dispatch = mk_dispatch();
+ tracing::dispatcher::with_default(&dispatch, || {
+ b.iter(|| {
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ })
+ });
+ });
+ group.bench_with_input(BenchmarkId::new("root/multithreaded", i), i, |b, &i| {
+ b.iter_custom(|iters| {
+ let mut total = Duration::from_secs(0);
+ let dispatch = mk_dispatch();
+ for _ in 0..iters {
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let elapsed = bench
+ .thread(move || {
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ })
+ .thread(move || {
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ })
+ .thread(move || {
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ })
+ .thread(move || {
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ })
+ .run();
+ total += elapsed;
+ }
+ total
+ })
+ });
+ group.bench_with_input(
+ BenchmarkId::new("unique_parent/single_threaded", i),
+ i,
+ |b, &i| {
+ tracing::dispatcher::with_default(&mk_dispatch(), || {
+ let span = tracing::info_span!("unique_parent", foo = false);
+ let _guard = span.enter();
+ b.iter(|| {
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ })
+ });
+ },
+ );
+ group.bench_with_input(
+ BenchmarkId::new("unique_parent/multithreaded", i),
+ i,
+ |b, &i| {
+ b.iter_custom(|iters| {
+ let mut total = Duration::from_secs(0);
+ let dispatch = mk_dispatch();
+ for _ in 0..iters {
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let elapsed = bench
+ .thread_with_setup(move |start| {
+ let span = tracing::info_span!("unique_parent", foo = false);
+ let _guard = span.enter();
+ start.wait();
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ })
+ .thread_with_setup(move |start| {
+ let span = tracing::info_span!("unique_parent", foo = false);
+ let _guard = span.enter();
+ start.wait();
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ })
+ .thread_with_setup(move |start| {
+ let span = tracing::info_span!("unique_parent", foo = false);
+ let _guard = span.enter();
+ start.wait();
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ })
+ .thread_with_setup(move |start| {
+ let span = tracing::info_span!("unique_parent", foo = false);
+ let _guard = span.enter();
+ start.wait();
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ })
+ .run();
+ total += elapsed;
+ }
+ total
+ })
+ },
+ );
+ group.bench_with_input(
+ BenchmarkId::new("shared_parent/multithreaded", i),
+ i,
+ |b, &i| {
+ b.iter_custom(|iters| {
+ let dispatch = mk_dispatch();
+ let mut total = Duration::from_secs(0);
+ for _ in 0..iters {
+ let parent = tracing::dispatcher::with_default(&dispatch, || {
+ tracing::info_span!("shared_parent", foo = "hello world")
+ });
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let parent2 = parent.clone();
+ bench.thread_with_setup(move |start| {
+ let _guard = parent2.enter();
+ start.wait();
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ });
+ let parent2 = parent.clone();
+ bench.thread_with_setup(move |start| {
+ let _guard = parent2.enter();
+ start.wait();
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ });
+ let parent2 = parent.clone();
+ bench.thread_with_setup(move |start| {
+ let _guard = parent2.enter();
+ start.wait();
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ });
+ let parent2 = parent.clone();
+ bench.thread_with_setup(move |start| {
+ let _guard = parent2.enter();
+ start.wait();
+ for n in 0..i {
+ tracing::info!(n);
+ }
+ });
+ let elapsed = bench.run();
+ total += elapsed;
+ }
+ total
+ })
+ },
+ );
+ group.bench_with_input(
+ BenchmarkId::new("multi-parent/multithreaded", i),
+ i,
+ |b, &i| {
+ b.iter_custom(|iters| {
+ let dispatch = mk_dispatch();
+ let mut total = Duration::from_secs(0);
+ for _ in 0..iters {
+ let parent = tracing::dispatcher::with_default(&dispatch, || {
+ tracing::info_span!("multiparent", foo = "hello world")
+ });
+ let bench = MultithreadedBench::new(dispatch.clone());
+ let parent2 = parent.clone();
+ bench.thread_with_setup(move |start| {
+ let _guard = parent2.enter();
+ start.wait();
+ let mut span = tracing::info_span!("parent");
+ for n in 0..i {
+ let s = tracing::info_span!(parent: &span, "parent2", n, i);
+ s.in_scope(|| {
+ tracing::info!(n);
+ });
+ span = s;
+ }
+ });
+ let parent2 = parent.clone();
+ bench.thread_with_setup(move |start| {
+ let _guard = parent2.enter();
+ start.wait();
+ let mut span = tracing::info_span!("parent");
+ for n in 0..i {
+ let s = tracing::info_span!(parent: &span, "parent2", n, i);
+ s.in_scope(|| {
+ tracing::info!(n);
+ });
+ span = s;
+ }
+ });
+ let parent2 = parent.clone();
+ bench.thread_with_setup(move |start| {
+ let _guard = parent2.enter();
+ start.wait();
+ let mut span = tracing::info_span!("parent");
+ for n in 0..i {
+ let s = tracing::info_span!(parent: &span, "parent2", n, i);
+ s.in_scope(|| {
+ tracing::info!(n);
+ });
+ span = s;
+ }
+ });
+ let parent2 = parent.clone();
+ bench.thread_with_setup(move |start| {
+ let _guard = parent2.enter();
+ start.wait();
+ let mut span = tracing::info_span!("parent");
+ for n in 0..i {
+ let s = tracing::info_span!(parent: &span, "parent2", n, i);
+ s.in_scope(|| {
+ tracing::info!(n);
+ });
+ span = s;
+ }
+ });
+ let elapsed = bench.run();
+ total += elapsed;
+ }
+ total
+ })
+ },
+ );
+ });
+}
+
+criterion_group!(benches, bench_new_span, bench_event);
+criterion_main!(benches);
diff --git a/vendor/tracing-subscriber-0.3.3/benches/support/mod.rs b/vendor/tracing-subscriber-0.3.3/benches/support/mod.rs
new file mode 100644
index 000000000..25e9e7e22
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/benches/support/mod.rs
@@ -0,0 +1,49 @@
+use std::{
+ sync::{Arc, Barrier},
+ thread,
+ time::{Duration, Instant},
+};
+use tracing::dispatcher::Dispatch;
+
+#[derive(Clone)]
+pub(super) struct MultithreadedBench {
+ start: Arc<Barrier>,
+ end: Arc<Barrier>,
+ dispatch: Dispatch,
+}
+
+impl MultithreadedBench {
+ pub(super) fn new(dispatch: Dispatch) -> Self {
+ Self {
+ start: Arc::new(Barrier::new(5)),
+ end: Arc::new(Barrier::new(5)),
+ dispatch,
+ }
+ }
+
+ pub(super) fn thread(&self, f: impl FnOnce() + Send + 'static) -> &Self {
+ self.thread_with_setup(|start| {
+ start.wait();
+ f()
+ })
+ }
+
+ pub(super) fn thread_with_setup(&self, f: impl FnOnce(&Barrier) + Send + 'static) -> &Self {
+ let this = self.clone();
+ thread::spawn(move || {
+ let dispatch = this.dispatch.clone();
+ tracing::dispatcher::with_default(&dispatch, move || {
+ f(&*this.start);
+ this.end.wait();
+ })
+ });
+ self
+ }
+
+ pub(super) fn run(&self) -> Duration {
+ self.start.wait();
+ let t0 = Instant::now();
+ self.end.wait();
+ t0.elapsed()
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/field/debug.rs b/vendor/tracing-subscriber-0.3.3/src/field/debug.rs
new file mode 100644
index 000000000..cc67d29fe
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/field/debug.rs
@@ -0,0 +1,111 @@
+//! `MakeVisitor` wrappers for working with `fmt::Debug` fields.
+use super::{MakeVisitor, VisitFmt, VisitOutput};
+use tracing_core::field::{Field, Visit};
+
+use core::fmt;
+
+/// A visitor wrapper that ensures any `fmt::Debug` fields are formatted using
+/// the alternate (`:#`) formatter.
+#[derive(Debug, Clone)]
+pub struct Alt<V>(V);
+
+// TODO(eliza): When `error` as a primitive type is stable, add a
+// `DisplayErrors` wrapper...
+
+// === impl Alt ===
+//
+impl<V> Alt<V> {
+ /// Wraps the provided visitor so that any `fmt::Debug` fields are formatted
+ /// using the alternative (`:#`) formatter.
+ pub fn new(inner: V) -> Self {
+ Alt(inner)
+ }
+}
+
+impl<T, V> MakeVisitor<T> for Alt<V>
+where
+ V: MakeVisitor<T>,
+{
+ type Visitor = Alt<V::Visitor>;
+
+ #[inline]
+ fn make_visitor(&self, target: T) -> Self::Visitor {
+ Alt(self.0.make_visitor(target))
+ }
+}
+
+impl<V> Visit for Alt<V>
+where
+ V: Visit,
+{
+ #[inline]
+ fn record_f64(&mut self, field: &Field, value: f64) {
+ self.0.record_f64(field, value)
+ }
+
+ #[inline]
+ fn record_i64(&mut self, field: &Field, value: i64) {
+ self.0.record_i64(field, value)
+ }
+
+ #[inline]
+ fn record_u64(&mut self, field: &Field, value: u64) {
+ self.0.record_u64(field, value)
+ }
+
+ #[inline]
+ fn record_bool(&mut self, field: &Field, value: bool) {
+ self.0.record_bool(field, value)
+ }
+
+ /// Visit a string value.
+ fn record_str(&mut self, field: &Field, value: &str) {
+ self.0.record_str(field, value)
+ }
+
+ // TODO(eliza): add RecordError when stable
+ // fn record_error(&mut self, field: &Field, value: &(dyn std::error::Error + 'static)) {
+ // self.record_debug(field, &format_args!("{}", value))
+ // }
+
+ #[inline]
+ fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
+ self.0.record_debug(field, &format_args!("{:#?}", value))
+ }
+}
+
+impl<V, O> VisitOutput<O> for Alt<V>
+where
+ V: VisitOutput<O>,
+{
+ #[inline]
+ fn finish(self) -> O {
+ self.0.finish()
+ }
+}
+
+feature! {
+ #![feature = "std"]
+ use super::VisitWrite;
+ use std::io;
+
+ impl<V> VisitWrite for Alt<V>
+ where
+ V: VisitWrite,
+ {
+ #[inline]
+ fn writer(&mut self) -> &mut dyn io::Write {
+ self.0.writer()
+ }
+ }
+}
+
+impl<V> VisitFmt for Alt<V>
+where
+ V: VisitFmt,
+{
+ #[inline]
+ fn writer(&mut self) -> &mut dyn fmt::Write {
+ self.0.writer()
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/field/delimited.rs b/vendor/tracing-subscriber-0.3.3/src/field/delimited.rs
new file mode 100644
index 000000000..8c78c4b20
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/field/delimited.rs
@@ -0,0 +1,184 @@
+//! A `MakeVisitor` wrapper that separates formatted fields with a delimiter.
+use super::{MakeVisitor, VisitFmt, VisitOutput};
+
+use core::fmt;
+use tracing_core::field::{Field, Visit};
+
+/// A `MakeVisitor` wrapper that wraps a visitor that writes formatted output so
+/// that a delimiter is inserted between writing formatted field values.
+#[derive(Debug, Clone)]
+pub struct Delimited<D, V> {
+ delimiter: D,
+ inner: V,
+}
+
+/// A visitor wrapper that inserts a delimiter after the wrapped visitor formats
+/// a field value.
+#[derive(Debug)]
+pub struct VisitDelimited<D, V> {
+ delimiter: D,
+ seen: bool,
+ inner: V,
+ err: fmt::Result,
+}
+
+// === impl Delimited ===
+
+impl<D, V, T> MakeVisitor<T> for Delimited<D, V>
+where
+ D: AsRef<str> + Clone,
+ V: MakeVisitor<T>,
+ V::Visitor: VisitFmt,
+{
+ type Visitor = VisitDelimited<D, V::Visitor>;
+ fn make_visitor(&self, target: T) -> Self::Visitor {
+ let inner = self.inner.make_visitor(target);
+ VisitDelimited::new(self.delimiter.clone(), inner)
+ }
+}
+
+impl<D, V> Delimited<D, V> {
+ /// Returns a new [`MakeVisitor`] implementation that wraps `inner` so that
+ /// it will format each visited field separated by the provided `delimiter`.
+ ///
+ /// [`MakeVisitor`]: ../trait.MakeVisitor.html
+ pub fn new(delimiter: D, inner: V) -> Self {
+ Self { delimiter, inner }
+ }
+}
+
+// === impl VisitDelimited ===
+
+impl<D, V> VisitDelimited<D, V> {
+ /// Returns a new [`Visit`] implementation that wraps `inner` so that
+ /// each formatted field is separated by the provided `delimiter`.
+ ///
+ /// [`Visit`]: https://docs.rs/tracing-core/0.1.6/tracing_core/field/trait.Visit.html
+ pub fn new(delimiter: D, inner: V) -> Self {
+ Self {
+ delimiter,
+ inner,
+ seen: false,
+ err: Ok(()),
+ }
+ }
+
+ fn delimit(&mut self)
+ where
+ V: VisitFmt,
+ D: AsRef<str>,
+ {
+ if self.err.is_err() {
+ return;
+ }
+
+ if self.seen {
+ self.err = self.inner.writer().write_str(self.delimiter.as_ref());
+ }
+
+ self.seen = true;
+ }
+}
+
+impl<D, V> Visit for VisitDelimited<D, V>
+where
+ V: VisitFmt,
+ D: AsRef<str>,
+{
+ fn record_i64(&mut self, field: &Field, value: i64) {
+ self.delimit();
+ self.inner.record_i64(field, value);
+ }
+
+ fn record_u64(&mut self, field: &Field, value: u64) {
+ self.delimit();
+ self.inner.record_u64(field, value);
+ }
+
+ fn record_bool(&mut self, field: &Field, value: bool) {
+ self.delimit();
+ self.inner.record_bool(field, value);
+ }
+
+ fn record_str(&mut self, field: &Field, value: &str) {
+ self.delimit();
+ self.inner.record_str(field, value);
+ }
+
+ fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
+ self.delimit();
+ self.inner.record_debug(field, value);
+ }
+}
+
+impl<D, V> VisitOutput<fmt::Result> for VisitDelimited<D, V>
+where
+ V: VisitFmt,
+ D: AsRef<str>,
+{
+ fn finish(self) -> fmt::Result {
+ self.err?;
+ self.inner.finish()
+ }
+}
+
+impl<D, V> VisitFmt for VisitDelimited<D, V>
+where
+ V: VisitFmt,
+ D: AsRef<str>,
+{
+ fn writer(&mut self) -> &mut dyn fmt::Write {
+ self.inner.writer()
+ }
+}
+
+#[cfg(test)]
+#[cfg(all(test, feature = "alloc"))]
+mod test {
+ use super::*;
+ use crate::field::test_util::*;
+
+ #[test]
+ fn delimited_visitor() {
+ let mut s = String::new();
+ let visitor = DebugVisitor::new(&mut s);
+ let mut visitor = VisitDelimited::new(", ", visitor);
+
+ TestAttrs1::with(|attrs| attrs.record(&mut visitor));
+ visitor.finish().unwrap();
+
+ assert_eq!(
+ s.as_str(),
+ "question=\"life, the universe, and everything\", tricky=true, can_you_do_it=true"
+ );
+ }
+
+ #[test]
+ fn delimited_new_visitor() {
+ let make = Delimited::new("; ", MakeDebug);
+
+ TestAttrs1::with(|attrs| {
+ let mut s = String::new();
+ {
+ let mut v = make.make_visitor(&mut s);
+ attrs.record(&mut v);
+ }
+ assert_eq!(
+ s.as_str(),
+ "question=\"life, the universe, and everything\"; tricky=true; can_you_do_it=true"
+ );
+ });
+
+ TestAttrs2::with(|attrs| {
+ let mut s = String::new();
+ {
+ let mut v = make.make_visitor(&mut s);
+ attrs.record(&mut v);
+ }
+ assert_eq!(
+ s.as_str(),
+ "question=None; question.answer=42; tricky=true; can_you_do_it=false"
+ );
+ });
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/field/display.rs b/vendor/tracing-subscriber-0.3.3/src/field/display.rs
new file mode 100644
index 000000000..e0bbc55ed
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/field/display.rs
@@ -0,0 +1,117 @@
+//! `MakeVisitor` wrappers for working with `fmt::Display` fields.
+use super::{MakeVisitor, VisitFmt, VisitOutput};
+use tracing_core::field::{Field, Visit};
+
+use core::fmt;
+
+/// A visitor wrapper that ensures any strings named "message" are formatted
+/// using `fmt::Display`
+#[derive(Debug, Clone)]
+pub struct Messages<V>(V);
+
+// TODO(eliza): When `error` as a primitive type is stable, add a
+// `DisplayErrors` wrapper...
+
+// === impl Messages ===
+//
+impl<V> Messages<V> {
+ /// Returns a new [`MakeVisitor`] implementation that will wrap `inner` so
+ /// that any strings named `message` are formatted using `fmt::Display`.
+ ///
+ /// [`MakeVisitor`]: ../trait.MakeVisitor.html
+ pub fn new(inner: V) -> Self {
+ Messages(inner)
+ }
+}
+
+impl<T, V> MakeVisitor<T> for Messages<V>
+where
+ V: MakeVisitor<T>,
+{
+ type Visitor = Messages<V::Visitor>;
+
+ #[inline]
+ fn make_visitor(&self, target: T) -> Self::Visitor {
+ Messages(self.0.make_visitor(target))
+ }
+}
+
+impl<V> Visit for Messages<V>
+where
+ V: Visit,
+{
+ #[inline]
+ fn record_f64(&mut self, field: &Field, value: f64) {
+ self.0.record_f64(field, value)
+ }
+
+ #[inline]
+ fn record_i64(&mut self, field: &Field, value: i64) {
+ self.0.record_i64(field, value)
+ }
+
+ #[inline]
+ fn record_u64(&mut self, field: &Field, value: u64) {
+ self.0.record_u64(field, value)
+ }
+
+ #[inline]
+ fn record_bool(&mut self, field: &Field, value: bool) {
+ self.0.record_bool(field, value)
+ }
+
+ /// Visit a string value.
+ fn record_str(&mut self, field: &Field, value: &str) {
+ if field.name() == "message" {
+ self.0.record_debug(field, &format_args!("{}", value))
+ } else {
+ self.0.record_str(field, value)
+ }
+ }
+
+ // TODO(eliza): add RecordError when stable
+ // fn record_error(&mut self, field: &Field, value: &(dyn std::error::Error + 'static)) {
+ // self.record_debug(field, &format_args!("{}", value))
+ // }
+
+ #[inline]
+ fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
+ self.0.record_debug(field, value)
+ }
+}
+
+impl<V, O> VisitOutput<O> for Messages<V>
+where
+ V: VisitOutput<O>,
+{
+ #[inline]
+ fn finish(self) -> O {
+ self.0.finish()
+ }
+}
+
+feature! {
+ #![feature = "std"]
+ use super::VisitWrite;
+ use std::io;
+
+ impl<V> VisitWrite for Messages<V>
+ where
+ V: VisitWrite,
+ {
+ #[inline]
+ fn writer(&mut self) -> &mut dyn io::Write {
+ self.0.writer()
+ }
+ }
+}
+
+impl<V> VisitFmt for Messages<V>
+where
+ V: VisitFmt,
+{
+ #[inline]
+ fn writer(&mut self) -> &mut dyn fmt::Write {
+ self.0.writer()
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/field/mod.rs b/vendor/tracing-subscriber-0.3.3/src/field/mod.rs
new file mode 100644
index 000000000..f7d03f2cc
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/field/mod.rs
@@ -0,0 +1,366 @@
+//! Utilities for working with [fields] and [field visitors].
+//!
+//! [fields]: tracing_core::field
+//! [field visitors]: tracing_core::field::Visit
+use core::{fmt, marker::PhantomData};
+pub use tracing_core::field::Visit;
+use tracing_core::{
+ span::{Attributes, Record},
+ Event,
+};
+pub mod debug;
+pub mod delimited;
+pub mod display;
+
+/// Creates new [visitors].
+///
+/// A type implementing `MakeVisitor` represents a composable factory for types
+/// implementing the [`Visit` trait][visitors]. The `MakeVisitor` trait defines
+/// a single function, `make_visitor`, which takes in a `T`-typed `target` and
+/// returns a type implementing `Visit` configured for that target. A target may
+/// be a string, output stream, or data structure that the visitor will record
+/// data to, configuration variables that determine the visitor's behavior, or
+/// `()` when no input is required to produce a visitor.
+///
+/// [visitors]: https://docs.rs/tracing-core/latest/tracing_core/field/trait.Visit.html
+pub trait MakeVisitor<T> {
+ /// The visitor type produced by this `MakeVisitor`.
+ type Visitor: Visit;
+
+ /// Make a new visitor for the provided `target`.
+ fn make_visitor(&self, target: T) -> Self::Visitor;
+}
+
+/// A [visitor] that produces output once it has visited a set of fields.
+///
+/// [visitor]: https://docs.rs/tracing-core/latest/tracing_core/field/trait.Visit.html
+pub trait VisitOutput<Out>: Visit {
+ /// Completes the visitor, returning any output.
+ ///
+ /// This is called once a full set of fields has been visited.
+ fn finish(self) -> Out;
+
+ /// Visit a set of fields, and return the output of finishing the visitor
+ /// once the fields have been visited.
+ fn visit<R>(mut self, fields: &R) -> Out
+ where
+ R: RecordFields,
+ Self: Sized,
+ {
+ fields.record(&mut self);
+ self.finish()
+ }
+}
+
+/// Extension trait implemented by types which can be recorded by a [visitor].
+///
+/// This allows writing code that is generic over `tracing_core`'s
+/// [`span::Attributes`][attr], [`span::Record`][rec], and [`Event`][event]
+/// types. These types all provide inherent `record` methods that allow a
+/// visitor to record their fields, but there is no common trait representing this.
+///
+/// With `RecordFields`, we can write code like this:
+/// ```
+/// use tracing_core::field::Visit;
+/// # use tracing_core::field::Field;
+/// use tracing_subscriber::field::RecordFields;
+///
+/// struct MyVisitor {
+/// // ...
+/// }
+/// # impl MyVisitor { fn new() -> Self { Self{} } }
+/// impl Visit for MyVisitor {
+/// // ...
+/// # fn record_debug(&mut self, _: &Field, _: &dyn std::fmt::Debug) {}
+/// }
+///
+/// fn record_with_my_visitor<R>(r: R)
+/// where
+/// R: RecordFields,
+/// {
+/// let mut visitor = MyVisitor::new();
+/// r.record(&mut visitor);
+/// }
+/// ```
+/// [visitor]: https://docs.rs/tracing-core/latest/tracing_core/field/trait.Visit.html
+/// [attr]: https://docs.rs/tracing-core/latest/tracing_core/span/struct.Attributes.html
+/// [rec]: https://docs.rs/tracing-core/latest/tracing_core/span/struct.Record.html
+/// [event]: https://docs.rs/tracing-core/latest/tracing_core/event/struct.Event.html
+pub trait RecordFields: crate::sealed::Sealed<RecordFieldsMarker> {
+ /// Record all the fields in `self` with the provided `visitor`.
+ fn record(&self, visitor: &mut dyn Visit);
+}
+
+/// Extension trait implemented for all `MakeVisitor` implementations that
+/// produce a visitor implementing `VisitOutput`.
+pub trait MakeOutput<T, Out>
+where
+ Self: MakeVisitor<T> + crate::sealed::Sealed<(T, Out)>,
+ Self::Visitor: VisitOutput<Out>,
+{
+ /// Visits all fields in `fields` with a new visitor constructed from
+ /// `target`.
+ fn visit_with<F>(&self, target: T, fields: &F) -> Out
+ where
+ F: RecordFields,
+ {
+ self.make_visitor(target).visit(fields)
+ }
+}
+
+feature! {
+ #![feature = "std"]
+ use std::io;
+
+ /// Extension trait implemented by visitors to indicate that they write to an
+ /// `io::Write` instance, and allow access to that writer.
+ pub trait VisitWrite: VisitOutput<Result<(), io::Error>> {
+ /// Returns the writer that this visitor writes to.
+ fn writer(&mut self) -> &mut dyn io::Write;
+ }
+}
+
+/// Extension trait implemented by visitors to indicate that they write to a
+/// `fmt::Write` instance, and allow access to that writer.
+pub trait VisitFmt: VisitOutput<fmt::Result> {
+ /// Returns the formatter that this visitor writes to.
+ fn writer(&mut self) -> &mut dyn fmt::Write;
+}
+
+/// Extension trait providing `MakeVisitor` combinators.
+pub trait MakeExt<T>
+where
+ Self: MakeVisitor<T> + Sized,
+ Self: crate::sealed::Sealed<MakeExtMarker<T>>,
+{
+ /// Wraps `self` so that any `fmt::Debug` fields are recorded using the
+ /// alternate formatter (`{:#?}`).
+ fn debug_alt(self) -> debug::Alt<Self> {
+ debug::Alt::new(self)
+ }
+
+ /// Wraps `self` so that any string fields named "message" are recorded
+ /// using `fmt::Display`.
+ fn display_messages(self) -> display::Messages<Self> {
+ display::Messages::new(self)
+ }
+
+ /// Wraps `self` so that when fields are formatted to a writer, they are
+ /// separated by the provided `delimiter`.
+ fn delimited<D>(self, delimiter: D) -> delimited::Delimited<D, Self>
+ where
+ D: AsRef<str> + Clone,
+ Self::Visitor: VisitFmt,
+ {
+ delimited::Delimited::new(delimiter, self)
+ }
+}
+
+// === impl RecordFields ===
+
+impl<'a> crate::sealed::Sealed<RecordFieldsMarker> for Event<'a> {}
+impl<'a> RecordFields for Event<'a> {
+ fn record(&self, visitor: &mut dyn Visit) {
+ Event::record(self, visitor)
+ }
+}
+
+impl<'a> crate::sealed::Sealed<RecordFieldsMarker> for Attributes<'a> {}
+impl<'a> RecordFields for Attributes<'a> {
+ fn record(&self, visitor: &mut dyn Visit) {
+ Attributes::record(self, visitor)
+ }
+}
+
+impl<'a> crate::sealed::Sealed<RecordFieldsMarker> for Record<'a> {}
+impl<'a> RecordFields for Record<'a> {
+ fn record(&self, visitor: &mut dyn Visit) {
+ Record::record(self, visitor)
+ }
+}
+
+impl<'a, F> crate::sealed::Sealed<RecordFieldsMarker> for &'a F where F: RecordFields {}
+impl<'a, F> RecordFields for &'a F
+where
+ F: RecordFields,
+{
+ fn record(&self, visitor: &mut dyn Visit) {
+ F::record(*self, visitor)
+ }
+}
+
+// === blanket impls ===
+
+impl<T, V, F> MakeVisitor<T> for F
+where
+ F: Fn(T) -> V,
+ V: Visit,
+{
+ type Visitor = V;
+ fn make_visitor(&self, target: T) -> Self::Visitor {
+ (self)(target)
+ }
+}
+
+impl<T, Out, M> crate::sealed::Sealed<(T, Out)> for M
+where
+ M: MakeVisitor<T>,
+ M::Visitor: VisitOutput<Out>,
+{
+}
+
+impl<T, Out, M> MakeOutput<T, Out> for M
+where
+ M: MakeVisitor<T>,
+ M::Visitor: VisitOutput<Out>,
+{
+}
+
+impl<T, M> crate::sealed::Sealed<MakeExtMarker<T>> for M where M: MakeVisitor<T> + Sized {}
+
+impl<T, M> MakeExt<T> for M
+where
+ M: MakeVisitor<T> + Sized,
+ M: crate::sealed::Sealed<MakeExtMarker<T>>,
+{
+}
+
+#[derive(Debug)]
+#[doc(hidden)]
+pub struct MakeExtMarker<T> {
+ _p: PhantomData<T>,
+}
+
+#[derive(Debug)]
+#[doc(hidden)]
+pub struct RecordFieldsMarker {
+ _p: (),
+}
+
+#[cfg(all(test, feature = "alloc"))]
+#[macro_use]
+pub(in crate::field) mod test_util {
+ use super::*;
+ pub(in crate::field) use alloc::string::String;
+ use tracing_core::{
+ callsite::Callsite,
+ field::{Field, Value},
+ metadata::{Kind, Level, Metadata},
+ };
+
+ pub(crate) struct TestAttrs1;
+ pub(crate) struct TestAttrs2;
+
+ impl TestAttrs1 {
+ pub(crate) fn with<T>(f: impl FnOnce(Attributes<'_>) -> T) -> T {
+ let fieldset = TEST_META_1.fields();
+ let values = &[
+ (
+ &fieldset.field("question").unwrap(),
+ Some(&"life, the universe, and everything" as &dyn Value),
+ ),
+ (&fieldset.field("question.answer").unwrap(), None),
+ (
+ &fieldset.field("tricky").unwrap(),
+ Some(&true as &dyn Value),
+ ),
+ (
+ &fieldset.field("can_you_do_it").unwrap(),
+ Some(&true as &dyn Value),
+ ),
+ ];
+ let valueset = fieldset.value_set(values);
+ let attrs = tracing_core::span::Attributes::new(&TEST_META_1, &valueset);
+ f(attrs)
+ }
+ }
+
+ impl TestAttrs2 {
+ pub(crate) fn with<T>(f: impl FnOnce(Attributes<'_>) -> T) -> T {
+ let fieldset = TEST_META_1.fields();
+ let none = tracing_core::field::debug(&Option::<&str>::None);
+ let values = &[
+ (
+ &fieldset.field("question").unwrap(),
+ Some(&none as &dyn Value),
+ ),
+ (
+ &fieldset.field("question.answer").unwrap(),
+ Some(&42 as &dyn Value),
+ ),
+ (
+ &fieldset.field("tricky").unwrap(),
+ Some(&true as &dyn Value),
+ ),
+ (
+ &fieldset.field("can_you_do_it").unwrap(),
+ Some(&false as &dyn Value),
+ ),
+ ];
+ let valueset = fieldset.value_set(values);
+ let attrs = tracing_core::span::Attributes::new(&TEST_META_1, &valueset);
+ f(attrs)
+ }
+ }
+
+ struct TestCallsite1;
+ static TEST_CALLSITE_1: &'static dyn Callsite = &TestCallsite1;
+ static TEST_META_1: Metadata<'static> = tracing_core::metadata! {
+ name: "field_test1",
+ target: module_path!(),
+ level: Level::INFO,
+ fields: &["question", "question.answer", "tricky", "can_you_do_it"],
+ callsite: TEST_CALLSITE_1,
+ kind: Kind::SPAN,
+ };
+
+ impl Callsite for TestCallsite1 {
+ fn set_interest(&self, _: tracing_core::subscriber::Interest) {
+ unimplemented!()
+ }
+
+ fn metadata(&self) -> &Metadata<'_> {
+ &TEST_META_1
+ }
+ }
+
+ pub(crate) struct MakeDebug;
+ pub(crate) struct DebugVisitor<'a> {
+ writer: &'a mut dyn fmt::Write,
+ err: fmt::Result,
+ }
+
+ impl<'a> DebugVisitor<'a> {
+ pub(crate) fn new(writer: &'a mut dyn fmt::Write) -> Self {
+ Self {
+ writer,
+ err: Ok(()),
+ }
+ }
+ }
+
+ impl<'a> Visit for DebugVisitor<'a> {
+ fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
+ write!(&mut self.writer, "{}={:?}", field, value).unwrap();
+ }
+ }
+
+ impl<'a> VisitOutput<fmt::Result> for DebugVisitor<'a> {
+ fn finish(self) -> fmt::Result {
+ self.err
+ }
+ }
+
+ impl<'a> VisitFmt for DebugVisitor<'a> {
+ fn writer(&mut self) -> &mut dyn fmt::Write {
+ self.writer
+ }
+ }
+
+ impl<'a> MakeVisitor<&'a mut dyn fmt::Write> for MakeDebug {
+ type Visitor = DebugVisitor<'a>;
+ fn make_visitor(&self, w: &'a mut dyn fmt::Write) -> DebugVisitor<'a> {
+ DebugVisitor::new(w)
+ }
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/filter/directive.rs b/vendor/tracing-subscriber-0.3.3/src/filter/directive.rs
new file mode 100644
index 000000000..dd6b063c4
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/filter/directive.rs
@@ -0,0 +1,424 @@
+use crate::filter::level::{self, LevelFilter};
+#[cfg(not(feature = "smallvec"))]
+use alloc::vec;
+#[cfg(not(feature = "std"))]
+use alloc::{string::String, vec::Vec};
+
+use core::{cmp::Ordering, fmt, iter::FromIterator, slice, str::FromStr};
+use tracing_core::Metadata;
+/// Indicates that a string could not be parsed as a filtering directive.
+#[derive(Debug)]
+pub struct ParseError {
+ kind: ParseErrorKind,
+}
+
+/// A directive which will statically enable or disable a given callsite.
+///
+/// Unlike a dynamic directive, this can be cached by the callsite.
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub(crate) struct StaticDirective {
+ pub(in crate::filter) target: Option<String>,
+ pub(in crate::filter) field_names: Vec<String>,
+ pub(in crate::filter) level: LevelFilter,
+}
+
+#[cfg(feature = "smallvec")]
+pub(crate) type FilterVec<T> = smallvec::SmallVec<[T; 8]>;
+#[cfg(not(feature = "smallvec"))]
+pub(crate) type FilterVec<T> = Vec<T>;
+
+#[derive(Debug, PartialEq, Clone)]
+pub(in crate::filter) struct DirectiveSet<T> {
+ directives: FilterVec<T>,
+ pub(in crate::filter) max_level: LevelFilter,
+}
+
+pub(in crate::filter) trait Match {
+ fn cares_about(&self, meta: &Metadata<'_>) -> bool;
+ fn level(&self) -> &LevelFilter;
+}
+
+#[derive(Debug)]
+enum ParseErrorKind {
+ #[cfg(feature = "std")]
+ Field(Box<dyn std::error::Error + Send + Sync>),
+ Level(level::ParseError),
+ Other(Option<&'static str>),
+}
+
+// === impl DirectiveSet ===
+
+impl<T> DirectiveSet<T> {
+ #[cfg(feature = "env-filter")]
+ pub(crate) fn is_empty(&self) -> bool {
+ self.directives.is_empty()
+ }
+
+ pub(crate) fn iter(&self) -> slice::Iter<'_, T> {
+ self.directives.iter()
+ }
+}
+
+impl<T: Ord> Default for DirectiveSet<T> {
+ fn default() -> Self {
+ Self {
+ directives: FilterVec::new(),
+ max_level: LevelFilter::OFF,
+ }
+ }
+}
+
+impl<T: Match + Ord> DirectiveSet<T> {
+ pub(crate) fn directives(&self) -> impl Iterator<Item = &T> {
+ self.directives.iter()
+ }
+
+ pub(crate) fn directives_for<'a>(
+ &'a self,
+ metadata: &'a Metadata<'a>,
+ ) -> impl Iterator<Item = &'a T> + 'a {
+ self.directives().filter(move |d| d.cares_about(metadata))
+ }
+
+ pub(crate) fn add(&mut self, directive: T) {
+ // does this directive enable a more verbose level than the current
+ // max? if so, update the max level.
+ let level = *directive.level();
+ if level > self.max_level {
+ self.max_level = level;
+ }
+ // insert the directive into the vec of directives, ordered by
+ // specificity (length of target + number of field filters). this
+ // ensures that, when finding a directive to match a span or event, we
+ // search the directive set in most specific first order.
+ match self.directives.binary_search(&directive) {
+ Ok(i) => self.directives[i] = directive,
+ Err(i) => self.directives.insert(i, directive),
+ }
+ }
+
+ #[cfg(test)]
+ pub(in crate::filter) fn into_vec(self) -> FilterVec<T> {
+ self.directives
+ }
+}
+
+impl<T: Match + Ord> FromIterator<T> for DirectiveSet<T> {
+ fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
+ let mut this = Self::default();
+ this.extend(iter);
+ this
+ }
+}
+
+impl<T: Match + Ord> Extend<T> for DirectiveSet<T> {
+ fn extend<I: IntoIterator<Item = T>>(&mut self, iter: I) {
+ for directive in iter.into_iter() {
+ self.add(directive);
+ }
+ }
+}
+
+impl<T> IntoIterator for DirectiveSet<T> {
+ type Item = T;
+
+ #[cfg(feature = "smallvec")]
+ type IntoIter = smallvec::IntoIter<[T; 8]>;
+ #[cfg(not(feature = "smallvec"))]
+ type IntoIter = vec::IntoIter<T>;
+
+ fn into_iter(self) -> Self::IntoIter {
+ self.directives.into_iter()
+ }
+}
+
+// === impl Statics ===
+
+impl DirectiveSet<StaticDirective> {
+ pub(crate) fn enabled(&self, meta: &Metadata<'_>) -> bool {
+ let level = meta.level();
+ match self.directives_for(meta).next() {
+ Some(d) => d.level >= *level,
+ None => false,
+ }
+ }
+}
+
+// === impl StaticDirective ===
+
+impl StaticDirective {
+ pub(in crate::filter) fn new(
+ target: Option<String>,
+ field_names: Vec<String>,
+ level: LevelFilter,
+ ) -> Self {
+ Self {
+ target,
+ field_names,
+ level,
+ }
+ }
+}
+
+impl Ord for StaticDirective {
+ fn cmp(&self, other: &StaticDirective) -> Ordering {
+ // We attempt to order directives by how "specific" they are. This
+ // ensures that we try the most specific directives first when
+ // attempting to match a piece of metadata.
+
+ // First, we compare based on whether a target is specified, and the
+ // lengths of those targets if both have targets.
+ let ordering = self
+ .target
+ .as_ref()
+ .map(String::len)
+ .cmp(&other.target.as_ref().map(String::len))
+ // Then we compare how many field names are matched by each directive.
+ .then_with(|| self.field_names.len().cmp(&other.field_names.len()))
+ // Finally, we fall back to lexicographical ordering if the directives are
+ // equally specific. Although this is no longer semantically important,
+ // we need to define a total ordering to determine the directive's place
+ // in the BTreeMap.
+ .then_with(|| {
+ self.target
+ .cmp(&other.target)
+ .then_with(|| self.field_names[..].cmp(&other.field_names[..]))
+ })
+ .reverse();
+
+ #[cfg(debug_assertions)]
+ {
+ if ordering == Ordering::Equal {
+ debug_assert_eq!(
+ self.target, other.target,
+ "invariant violated: Ordering::Equal must imply a.target == b.target"
+ );
+ debug_assert_eq!(
+ self.field_names, other.field_names,
+ "invariant violated: Ordering::Equal must imply a.field_names == b.field_names"
+ );
+ }
+ }
+
+ ordering
+ }
+}
+
+impl PartialOrd for StaticDirective {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ Some(self.cmp(other))
+ }
+}
+
+impl Match for StaticDirective {
+ fn cares_about(&self, meta: &Metadata<'_>) -> bool {
+ // Does this directive have a target filter, and does it match the
+ // metadata's target?
+ if let Some(ref target) = self.target {
+ if !meta.target().starts_with(&target[..]) {
+ return false;
+ }
+ }
+
+ if meta.is_event() && !self.field_names.is_empty() {
+ let fields = meta.fields();
+ for name in &self.field_names {
+ if fields.field(name).is_none() {
+ return false;
+ }
+ }
+ }
+
+ true
+ }
+
+ fn level(&self) -> &LevelFilter {
+ &self.level
+ }
+}
+
+impl Default for StaticDirective {
+ fn default() -> Self {
+ StaticDirective {
+ target: None,
+ field_names: Vec::new(),
+ level: LevelFilter::ERROR,
+ }
+ }
+}
+
+impl fmt::Display for StaticDirective {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let mut wrote_any = false;
+ if let Some(ref target) = self.target {
+ fmt::Display::fmt(target, f)?;
+ wrote_any = true;
+ }
+
+ if !self.field_names.is_empty() {
+ f.write_str("[")?;
+
+ let mut fields = self.field_names.iter();
+ if let Some(field) = fields.next() {
+ write!(f, "{{{}", field)?;
+ for field in fields {
+ write!(f, ",{}", field)?;
+ }
+ f.write_str("}")?;
+ }
+
+ f.write_str("]")?;
+ wrote_any = true;
+ }
+
+ if wrote_any {
+ f.write_str("=")?;
+ }
+
+ fmt::Display::fmt(&self.level, f)
+ }
+}
+
+impl FromStr for StaticDirective {
+ type Err = ParseError;
+
+ fn from_str(s: &str) -> Result<Self, Self::Err> {
+ // This method parses a filtering directive in one of the following
+ // forms:
+ //
+ // * `foo=trace` (TARGET=LEVEL)
+ // * `foo[{bar,baz}]=info` (TARGET[{FIELD,+}]=LEVEL)
+ // * `trace` (bare LEVEL)
+ // * `foo` (bare TARGET)
+ let mut split = s.split('=');
+ let part0 = split
+ .next()
+ .ok_or_else(|| ParseError::msg("string must not be empty"))?;
+
+ // Directive includes an `=`:
+ // * `foo=trace`
+ // * `foo[{bar}]=trace`
+ // * `foo[{bar,baz}]=trace`
+ if let Some(part1) = split.next() {
+ if split.next().is_some() {
+ return Err(ParseError::msg(
+ "too many '=' in filter directive, expected 0 or 1",
+ ));
+ }
+
+ let mut split = part0.split("[{");
+ let target = split.next().map(String::from);
+ let mut field_names = Vec::new();
+ // Directive includes fields:
+ // * `foo[{bar}]=trace`
+ // * `foo[{bar,baz}]=trace`
+ if let Some(maybe_fields) = split.next() {
+ if split.next().is_some() {
+ return Err(ParseError::msg(
+ "too many '[{' in filter directive, expected 0 or 1",
+ ));
+ }
+
+ if !maybe_fields.ends_with("}]") {
+ return Err(ParseError::msg("expected fields list to end with '}]'"));
+ }
+
+ let fields = maybe_fields
+ .trim_end_matches("}]")
+ .split(',')
+ .filter_map(|s| {
+ if s.is_empty() {
+ None
+ } else {
+ Some(String::from(s))
+ }
+ });
+ field_names.extend(fields);
+ };
+ let level = part1.parse()?;
+ return Ok(Self {
+ level,
+ field_names,
+ target,
+ });
+ }
+
+ // Okay, the part after the `=` was empty, the directive is either a
+ // bare level or a bare target.
+ // * `foo`
+ // * `info`
+ Ok(match part0.parse::<LevelFilter>() {
+ Ok(level) => Self {
+ level,
+ target: None,
+ field_names: Vec::new(),
+ },
+ Err(_) => Self {
+ target: Some(String::from(part0)),
+ level: LevelFilter::TRACE,
+ field_names: Vec::new(),
+ },
+ })
+ }
+}
+
+// === impl ParseError ===
+
+impl ParseError {
+ #[cfg(feature = "env-filter")]
+ pub(crate) fn new() -> Self {
+ ParseError {
+ kind: ParseErrorKind::Other(None),
+ }
+ }
+
+ pub(crate) fn msg(s: &'static str) -> Self {
+ ParseError {
+ kind: ParseErrorKind::Other(Some(s)),
+ }
+ }
+}
+
+impl fmt::Display for ParseError {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self.kind {
+ ParseErrorKind::Other(None) => f.pad("invalid filter directive"),
+ ParseErrorKind::Other(Some(msg)) => write!(f, "invalid filter directive: {}", msg),
+ ParseErrorKind::Level(ref l) => l.fmt(f),
+ #[cfg(feature = "std")]
+ ParseErrorKind::Field(ref e) => write!(f, "invalid field filter: {}", e),
+ }
+ }
+}
+
+#[cfg(feature = "std")]
+impl std::error::Error for ParseError {
+ fn description(&self) -> &str {
+ "invalid filter directive"
+ }
+
+ fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+ match self.kind {
+ ParseErrorKind::Other(_) => None,
+ ParseErrorKind::Level(ref l) => Some(l),
+ ParseErrorKind::Field(ref n) => Some(n.as_ref()),
+ }
+ }
+}
+
+#[cfg(feature = "std")]
+impl From<Box<dyn std::error::Error + Send + Sync>> for ParseError {
+ fn from(e: Box<dyn std::error::Error + Send + Sync>) -> Self {
+ Self {
+ kind: ParseErrorKind::Field(e),
+ }
+ }
+}
+
+impl From<level::ParseError> for ParseError {
+ fn from(l: level::ParseError) -> Self {
+ Self {
+ kind: ParseErrorKind::Level(l),
+ }
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/filter/env/directive.rs b/vendor/tracing-subscriber-0.3.3/src/filter/env/directive.rs
new file mode 100644
index 000000000..66ca23dc4
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/filter/env/directive.rs
@@ -0,0 +1,846 @@
+pub(crate) use crate::filter::directive::{FilterVec, ParseError, StaticDirective};
+use crate::filter::{
+ directive::{DirectiveSet, Match},
+ env::{field, FieldMap},
+ level::LevelFilter,
+};
+use lazy_static::lazy_static;
+use regex::Regex;
+use std::{cmp::Ordering, fmt, iter::FromIterator, str::FromStr};
+use tracing_core::{span, Level, Metadata};
+
+/// A single filtering directive.
+// TODO(eliza): add a builder for programmatically constructing directives?
+#[derive(Debug, Eq, PartialEq)]
+#[cfg_attr(docsrs, doc(cfg(feature = "env-filter")))]
+pub struct Directive {
+ in_span: Option<String>,
+ fields: Vec<field::Match>,
+ pub(crate) target: Option<String>,
+ pub(crate) level: LevelFilter,
+}
+
+/// A set of dynamic filtering directives.
+pub(super) type Dynamics = DirectiveSet<Directive>;
+
+/// A set of static filtering directives.
+pub(super) type Statics = DirectiveSet<StaticDirective>;
+
+pub(crate) type CallsiteMatcher = MatchSet<field::CallsiteMatch>;
+pub(crate) type SpanMatcher = MatchSet<field::SpanMatch>;
+
+#[derive(Debug, PartialEq, Eq)]
+pub(crate) struct MatchSet<T> {
+ field_matches: FilterVec<T>,
+ base_level: LevelFilter,
+}
+
+impl Directive {
+ pub(super) fn has_name(&self) -> bool {
+ self.in_span.is_some()
+ }
+
+ pub(super) fn has_fields(&self) -> bool {
+ !self.fields.is_empty()
+ }
+
+ pub(super) fn to_static(&self) -> Option<StaticDirective> {
+ if !self.is_static() {
+ return None;
+ }
+
+ // TODO(eliza): these strings are all immutable; we should consider
+ // `Arc`ing them to make this more efficient...
+ let field_names = self.fields.iter().map(field::Match::name).collect();
+
+ Some(StaticDirective::new(
+ self.target.clone(),
+ field_names,
+ self.level,
+ ))
+ }
+
+ fn is_static(&self) -> bool {
+ !self.has_name() && !self.fields.iter().any(field::Match::has_value)
+ }
+
+ pub(super) fn is_dynamic(&self) -> bool {
+ self.has_name() || self.has_fields()
+ }
+
+ pub(crate) fn field_matcher(&self, meta: &Metadata<'_>) -> Option<field::CallsiteMatch> {
+ let fieldset = meta.fields();
+ let fields = self
+ .fields
+ .iter()
+ .filter_map(
+ |field::Match {
+ ref name,
+ ref value,
+ }| {
+ if let Some(field) = fieldset.field(name) {
+ let value = value.as_ref().cloned()?;
+ Some(Ok((field, value)))
+ } else {
+ Some(Err(()))
+ }
+ },
+ )
+ .collect::<Result<FieldMap<_>, ()>>()
+ .ok()?;
+ Some(field::CallsiteMatch {
+ fields,
+ level: self.level,
+ })
+ }
+
+ pub(super) fn make_tables(
+ directives: impl IntoIterator<Item = Directive>,
+ ) -> (Dynamics, Statics) {
+ // TODO(eliza): this could be made more efficient...
+ let (dyns, stats): (Vec<Directive>, Vec<Directive>) =
+ directives.into_iter().partition(Directive::is_dynamic);
+ let statics = stats
+ .into_iter()
+ .filter_map(|d| d.to_static())
+ .chain(dyns.iter().filter_map(Directive::to_static))
+ .collect();
+ (Dynamics::from_iter(dyns), statics)
+ }
+}
+
+impl Match for Directive {
+ fn cares_about(&self, meta: &Metadata<'_>) -> bool {
+ // Does this directive have a target filter, and does it match the
+ // metadata's target?
+ if let Some(ref target) = self.target {
+ if !meta.target().starts_with(&target[..]) {
+ return false;
+ }
+ }
+
+ // Do we have a name filter, and does it match the metadata's name?
+ // TODO(eliza): put name globbing here?
+ if let Some(ref name) = self.in_span {
+ if name != meta.name() {
+ return false;
+ }
+ }
+
+ // Does the metadata define all the fields that this directive cares about?
+ let fields = meta.fields();
+ for field in &self.fields {
+ if fields.field(&field.name).is_none() {
+ return false;
+ }
+ }
+
+ true
+ }
+
+ fn level(&self) -> &LevelFilter {
+ &self.level
+ }
+}
+
+impl FromStr for Directive {
+ type Err = ParseError;
+ fn from_str(from: &str) -> Result<Self, Self::Err> {
+ lazy_static! {
+ static ref DIRECTIVE_RE: Regex = Regex::new(
+ r"(?x)
+ ^(?P<global_level>(?i:trace|debug|info|warn|error|off|[0-5]))$ |
+ # ^^^.
+ # `note: we match log level names case-insensitively
+ ^
+ (?: # target name or span name
+ (?P<target>[\w:-]+)|(?P<span>\[[^\]]*\])
+ ){1,2}
+ (?: # level or nothing
+ =(?P<level>(?i:trace|debug|info|warn|error|off|[0-5]))?
+ # ^^^.
+ # `note: we match log level names case-insensitively
+ )?
+ $
+ "
+ )
+ .unwrap();
+ static ref SPAN_PART_RE: Regex =
+ Regex::new(r#"(?P<name>[^\]\{]+)?(?:\{(?P<fields>[^\}]*)\})?"#).unwrap();
+ static ref FIELD_FILTER_RE: Regex =
+ // TODO(eliza): this doesn't _currently_ handle value matchers that include comma
+ // characters. We should fix that.
+ Regex::new(r#"(?x)
+ (
+ # field name
+ [[:word:]][[[:word:]]\.]*
+ # value part (optional)
+ (?:=[^,]+)?
+ )
+ # trailing comma or EOS
+ (?:,\s?|$)
+ "#).unwrap();
+ }
+
+ let caps = DIRECTIVE_RE.captures(from).ok_or_else(ParseError::new)?;
+
+ if let Some(level) = caps
+ .name("global_level")
+ .and_then(|s| s.as_str().parse().ok())
+ {
+ return Ok(Directive {
+ level,
+ ..Default::default()
+ });
+ }
+
+ let target = caps.name("target").and_then(|c| {
+ let s = c.as_str();
+ if s.parse::<LevelFilter>().is_ok() {
+ None
+ } else {
+ Some(s.to_owned())
+ }
+ });
+
+ let (in_span, fields) = caps
+ .name("span")
+ .and_then(|cap| {
+ let cap = cap.as_str().trim_matches(|c| c == '[' || c == ']');
+ let caps = SPAN_PART_RE.captures(cap)?;
+ let span = caps.name("name").map(|c| c.as_str().to_owned());
+ let fields = caps
+ .name("fields")
+ .map(|c| {
+ FIELD_FILTER_RE
+ .find_iter(c.as_str())
+ .map(|c| c.as_str().parse())
+ .collect::<Result<Vec<_>, _>>()
+ })
+ .unwrap_or_else(|| Ok(Vec::new()));
+ Some((span, fields))
+ })
+ .unwrap_or_else(|| (None, Ok(Vec::new())));
+
+ let level = caps
+ .name("level")
+ .and_then(|l| l.as_str().parse().ok())
+ // Setting the target without the level enables every level for that target
+ .unwrap_or(LevelFilter::TRACE);
+
+ Ok(Directive {
+ level,
+ target,
+ in_span,
+ fields: fields?,
+ })
+ }
+}
+
+impl Default for Directive {
+ fn default() -> Self {
+ Directive {
+ level: LevelFilter::OFF,
+ target: None,
+ in_span: None,
+ fields: Vec::new(),
+ }
+ }
+}
+
+impl PartialOrd for Directive {
+ fn partial_cmp(&self, other: &Directive) -> Option<Ordering> {
+ Some(self.cmp(other))
+ }
+}
+
+impl Ord for Directive {
+ fn cmp(&self, other: &Directive) -> Ordering {
+ // We attempt to order directives by how "specific" they are. This
+ // ensures that we try the most specific directives first when
+ // attempting to match a piece of metadata.
+
+ // First, we compare based on whether a target is specified, and the
+ // lengths of those targets if both have targets.
+ let ordering = self
+ .target
+ .as_ref()
+ .map(String::len)
+ .cmp(&other.target.as_ref().map(String::len))
+ // Next compare based on the presence of span names.
+ .then_with(|| self.in_span.is_some().cmp(&other.in_span.is_some()))
+ // Then we compare how many fields are defined by each
+ // directive.
+ .then_with(|| self.fields.len().cmp(&other.fields.len()))
+ // Finally, we fall back to lexicographical ordering if the directives are
+ // equally specific. Although this is no longer semantically important,
+ // we need to define a total ordering to determine the directive's place
+ // in the BTreeMap.
+ .then_with(|| {
+ self.target
+ .cmp(&other.target)
+ .then_with(|| self.in_span.cmp(&other.in_span))
+ .then_with(|| self.fields[..].cmp(&other.fields[..]))
+ })
+ .reverse();
+
+ #[cfg(debug_assertions)]
+ {
+ if ordering == Ordering::Equal {
+ debug_assert_eq!(
+ self.target, other.target,
+ "invariant violated: Ordering::Equal must imply a.target == b.target"
+ );
+ debug_assert_eq!(
+ self.in_span, other.in_span,
+ "invariant violated: Ordering::Equal must imply a.in_span == b.in_span"
+ );
+ debug_assert_eq!(
+ self.fields, other.fields,
+ "invariant violated: Ordering::Equal must imply a.fields == b.fields"
+ );
+ }
+ }
+
+ ordering
+ }
+}
+
+impl fmt::Display for Directive {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let mut wrote_any = false;
+ if let Some(ref target) = self.target {
+ fmt::Display::fmt(target, f)?;
+ wrote_any = true;
+ }
+
+ if self.in_span.is_some() || !self.fields.is_empty() {
+ f.write_str("[")?;
+
+ if let Some(ref span) = self.in_span {
+ fmt::Display::fmt(span, f)?;
+ }
+
+ let mut fields = self.fields.iter();
+ if let Some(field) = fields.next() {
+ write!(f, "{{{}", field)?;
+ for field in fields {
+ write!(f, ",{}", field)?;
+ }
+ f.write_str("}")?;
+ }
+
+ f.write_str("]")?;
+ wrote_any = true;
+ }
+
+ if wrote_any {
+ f.write_str("=")?;
+ }
+
+ fmt::Display::fmt(&self.level, f)
+ }
+}
+
+impl From<LevelFilter> for Directive {
+ fn from(level: LevelFilter) -> Self {
+ Self {
+ level,
+ ..Self::default()
+ }
+ }
+}
+
+impl From<Level> for Directive {
+ fn from(level: Level) -> Self {
+ LevelFilter::from_level(level).into()
+ }
+}
+
+// === impl Dynamics ===
+
+impl Dynamics {
+ pub(crate) fn matcher(&self, metadata: &Metadata<'_>) -> Option<CallsiteMatcher> {
+ let mut base_level = None;
+ let field_matches = self
+ .directives_for(metadata)
+ .filter_map(|d| {
+ if let Some(f) = d.field_matcher(metadata) {
+ return Some(f);
+ }
+ match base_level {
+ Some(ref b) if d.level > *b => base_level = Some(d.level),
+ None => base_level = Some(d.level),
+ _ => {}
+ }
+ None
+ })
+ .collect();
+
+ if let Some(base_level) = base_level {
+ Some(CallsiteMatcher {
+ field_matches,
+ base_level,
+ })
+ } else if !field_matches.is_empty() {
+ Some(CallsiteMatcher {
+ field_matches,
+ base_level: base_level.unwrap_or(LevelFilter::OFF),
+ })
+ } else {
+ None
+ }
+ }
+
+ pub(crate) fn has_value_filters(&self) -> bool {
+ self.directives()
+ .any(|d| d.fields.iter().any(|f| f.value.is_some()))
+ }
+}
+
+// ===== impl DynamicMatch =====
+
+impl CallsiteMatcher {
+ /// Create a new `SpanMatch` for a given instance of the matched callsite.
+ pub(crate) fn to_span_match(&self, attrs: &span::Attributes<'_>) -> SpanMatcher {
+ let field_matches = self
+ .field_matches
+ .iter()
+ .map(|m| {
+ let m = m.to_span_match();
+ attrs.record(&mut m.visitor());
+ m
+ })
+ .collect();
+ SpanMatcher {
+ field_matches,
+ base_level: self.base_level,
+ }
+ }
+}
+
+impl SpanMatcher {
+ /// Returns the level currently enabled for this callsite.
+ pub(crate) fn level(&self) -> LevelFilter {
+ self.field_matches
+ .iter()
+ .filter_map(field::SpanMatch::filter)
+ .max()
+ .unwrap_or(self.base_level)
+ }
+
+ pub(crate) fn record_update(&self, record: &span::Record<'_>) {
+ for m in &self.field_matches {
+ record.record(&mut m.visitor())
+ }
+ }
+}
+
+#[cfg(test)]
+mod test {
+ use super::*;
+
+ fn parse_directives(dirs: impl AsRef<str>) -> Vec<Directive> {
+ dirs.as_ref()
+ .split(',')
+ .filter_map(|s| s.parse().ok())
+ .collect()
+ }
+
+ fn expect_parse(dirs: impl AsRef<str>) -> Vec<Directive> {
+ dirs.as_ref()
+ .split(',')
+ .map(|s| {
+ s.parse()
+ .unwrap_or_else(|err| panic!("directive '{:?}' should parse: {}", s, err))
+ })
+ .collect()
+ }
+
+ #[test]
+ fn directive_ordering_by_target_len() {
+ // TODO(eliza): it would be nice to have a property-based test for this
+ // instead.
+ let mut dirs = expect_parse(
+ "foo::bar=debug,foo::bar::baz=trace,foo=info,a_really_long_name_with_no_colons=warn",
+ );
+ dirs.sort_unstable();
+
+ let expected = vec![
+ "a_really_long_name_with_no_colons",
+ "foo::bar::baz",
+ "foo::bar",
+ "foo",
+ ];
+ let sorted = dirs
+ .iter()
+ .map(|d| d.target.as_ref().unwrap())
+ .collect::<Vec<_>>();
+
+ assert_eq!(expected, sorted);
+ }
+ #[test]
+ fn directive_ordering_by_span() {
+ // TODO(eliza): it would be nice to have a property-based test for this
+ // instead.
+ let mut dirs = expect_parse("bar[span]=trace,foo=debug,baz::quux=info,a[span]=warn");
+ dirs.sort_unstable();
+
+ let expected = vec!["baz::quux", "bar", "foo", "a"];
+ let sorted = dirs
+ .iter()
+ .map(|d| d.target.as_ref().unwrap())
+ .collect::<Vec<_>>();
+
+ assert_eq!(expected, sorted);
+ }
+
+ #[test]
+ fn directive_ordering_uses_lexicographic_when_equal() {
+ // TODO(eliza): it would be nice to have a property-based test for this
+ // instead.
+ let mut dirs = expect_parse("span[b]=debug,b=debug,a=trace,c=info,span[a]=info");
+ dirs.sort_unstable();
+
+ let expected = vec![
+ ("span", Some("b")),
+ ("span", Some("a")),
+ ("c", None),
+ ("b", None),
+ ("a", None),
+ ];
+ let sorted = dirs
+ .iter()
+ .map(|d| {
+ (
+ d.target.as_ref().unwrap().as_ref(),
+ d.in_span.as_ref().map(String::as_ref),
+ )
+ })
+ .collect::<Vec<_>>();
+
+ assert_eq!(expected, sorted);
+ }
+
+ // TODO: this test requires the parser to support directives with multiple
+ // fields, which it currently can't handle. We should enable this test when
+ // that's implemented.
+ #[test]
+ #[ignore]
+ fn directive_ordering_by_field_num() {
+ // TODO(eliza): it would be nice to have a property-based test for this
+ // instead.
+ let mut dirs = expect_parse(
+ "b[{foo,bar}]=info,c[{baz,quuux,quuux}]=debug,a[{foo}]=warn,bar[{field}]=trace,foo=debug,baz::quux=info"
+ );
+ dirs.sort_unstable();
+
+ let expected = vec!["baz::quux", "bar", "foo", "c", "b", "a"];
+ let sorted = dirs
+ .iter()
+ .map(|d| d.target.as_ref().unwrap())
+ .collect::<Vec<_>>();
+
+ assert_eq!(expected, sorted);
+ }
+
+ #[test]
+ fn parse_directives_ralith() {
+ let dirs = parse_directives("common=trace,server=trace");
+ assert_eq!(dirs.len(), 2, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("common".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::TRACE);
+ assert_eq!(dirs[0].in_span, None);
+
+ assert_eq!(dirs[1].target, Some("server".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::TRACE);
+ assert_eq!(dirs[1].in_span, None);
+ }
+
+ #[test]
+ fn parse_directives_ralith_uc() {
+ let dirs = parse_directives("common=INFO,server=DEBUG");
+ assert_eq!(dirs.len(), 2, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("common".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::INFO);
+ assert_eq!(dirs[0].in_span, None);
+
+ assert_eq!(dirs[1].target, Some("server".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[1].in_span, None);
+ }
+
+ #[test]
+ fn parse_directives_ralith_mixed() {
+ let dirs = parse_directives("common=iNfo,server=dEbUg");
+ assert_eq!(dirs.len(), 2, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("common".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::INFO);
+ assert_eq!(dirs[0].in_span, None);
+
+ assert_eq!(dirs[1].target, Some("server".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[1].in_span, None);
+ }
+
+ #[test]
+ fn parse_directives_valid() {
+ let dirs = parse_directives("crate1::mod1=error,crate1::mod2,crate2=debug,crate3=off");
+ assert_eq!(dirs.len(), 4, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("crate1::mod1".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::ERROR);
+ assert_eq!(dirs[0].in_span, None);
+
+ assert_eq!(dirs[1].target, Some("crate1::mod2".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::TRACE);
+ assert_eq!(dirs[1].in_span, None);
+
+ assert_eq!(dirs[2].target, Some("crate2".to_string()));
+ assert_eq!(dirs[2].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[2].in_span, None);
+
+ assert_eq!(dirs[3].target, Some("crate3".to_string()));
+ assert_eq!(dirs[3].level, LevelFilter::OFF);
+ assert_eq!(dirs[3].in_span, None);
+ }
+
+ #[test]
+
+ fn parse_level_directives() {
+ let dirs = parse_directives(
+ "crate1::mod1=error,crate1::mod2=warn,crate1::mod2::mod3=info,\
+ crate2=debug,crate3=trace,crate3::mod2::mod1=off",
+ );
+ assert_eq!(dirs.len(), 6, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("crate1::mod1".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::ERROR);
+ assert_eq!(dirs[0].in_span, None);
+
+ assert_eq!(dirs[1].target, Some("crate1::mod2".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::WARN);
+ assert_eq!(dirs[1].in_span, None);
+
+ assert_eq!(dirs[2].target, Some("crate1::mod2::mod3".to_string()));
+ assert_eq!(dirs[2].level, LevelFilter::INFO);
+ assert_eq!(dirs[2].in_span, None);
+
+ assert_eq!(dirs[3].target, Some("crate2".to_string()));
+ assert_eq!(dirs[3].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[3].in_span, None);
+
+ assert_eq!(dirs[4].target, Some("crate3".to_string()));
+ assert_eq!(dirs[4].level, LevelFilter::TRACE);
+ assert_eq!(dirs[4].in_span, None);
+
+ assert_eq!(dirs[5].target, Some("crate3::mod2::mod1".to_string()));
+ assert_eq!(dirs[5].level, LevelFilter::OFF);
+ assert_eq!(dirs[5].in_span, None);
+ }
+
+ #[test]
+ fn parse_uppercase_level_directives() {
+ let dirs = parse_directives(
+ "crate1::mod1=ERROR,crate1::mod2=WARN,crate1::mod2::mod3=INFO,\
+ crate2=DEBUG,crate3=TRACE,crate3::mod2::mod1=OFF",
+ );
+ assert_eq!(dirs.len(), 6, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("crate1::mod1".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::ERROR);
+ assert_eq!(dirs[0].in_span, None);
+
+ assert_eq!(dirs[1].target, Some("crate1::mod2".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::WARN);
+ assert_eq!(dirs[1].in_span, None);
+
+ assert_eq!(dirs[2].target, Some("crate1::mod2::mod3".to_string()));
+ assert_eq!(dirs[2].level, LevelFilter::INFO);
+ assert_eq!(dirs[2].in_span, None);
+
+ assert_eq!(dirs[3].target, Some("crate2".to_string()));
+ assert_eq!(dirs[3].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[3].in_span, None);
+
+ assert_eq!(dirs[4].target, Some("crate3".to_string()));
+ assert_eq!(dirs[4].level, LevelFilter::TRACE);
+ assert_eq!(dirs[4].in_span, None);
+
+ assert_eq!(dirs[5].target, Some("crate3::mod2::mod1".to_string()));
+ assert_eq!(dirs[5].level, LevelFilter::OFF);
+ assert_eq!(dirs[5].in_span, None);
+ }
+
+ #[test]
+ fn parse_numeric_level_directives() {
+ let dirs = parse_directives(
+ "crate1::mod1=1,crate1::mod2=2,crate1::mod2::mod3=3,crate2=4,\
+ crate3=5,crate3::mod2::mod1=0",
+ );
+ assert_eq!(dirs.len(), 6, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("crate1::mod1".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::ERROR);
+ assert_eq!(dirs[0].in_span, None);
+
+ assert_eq!(dirs[1].target, Some("crate1::mod2".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::WARN);
+ assert_eq!(dirs[1].in_span, None);
+
+ assert_eq!(dirs[2].target, Some("crate1::mod2::mod3".to_string()));
+ assert_eq!(dirs[2].level, LevelFilter::INFO);
+ assert_eq!(dirs[2].in_span, None);
+
+ assert_eq!(dirs[3].target, Some("crate2".to_string()));
+ assert_eq!(dirs[3].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[3].in_span, None);
+
+ assert_eq!(dirs[4].target, Some("crate3".to_string()));
+ assert_eq!(dirs[4].level, LevelFilter::TRACE);
+ assert_eq!(dirs[4].in_span, None);
+
+ assert_eq!(dirs[5].target, Some("crate3::mod2::mod1".to_string()));
+ assert_eq!(dirs[5].level, LevelFilter::OFF);
+ assert_eq!(dirs[5].in_span, None);
+ }
+
+ #[test]
+ fn parse_directives_invalid_crate() {
+ // test parse_directives with multiple = in specification
+ let dirs = parse_directives("crate1::mod1=warn=info,crate2=debug");
+ assert_eq!(dirs.len(), 1, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("crate2".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[0].in_span, None);
+ }
+
+ #[test]
+ fn parse_directives_invalid_level() {
+ // test parse_directives with 'noNumber' as log level
+ let dirs = parse_directives("crate1::mod1=noNumber,crate2=debug");
+ assert_eq!(dirs.len(), 1, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("crate2".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[0].in_span, None);
+ }
+
+ #[test]
+ fn parse_directives_string_level() {
+ // test parse_directives with 'warn' as log level
+ let dirs = parse_directives("crate1::mod1=wrong,crate2=warn");
+ assert_eq!(dirs.len(), 1, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("crate2".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::WARN);
+ assert_eq!(dirs[0].in_span, None);
+ }
+
+ #[test]
+ fn parse_directives_empty_level() {
+ // test parse_directives with '' as log level
+ let dirs = parse_directives("crate1::mod1=wrong,crate2=");
+ assert_eq!(dirs.len(), 1, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("crate2".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::TRACE);
+ assert_eq!(dirs[0].in_span, None);
+ }
+
+ #[test]
+ fn parse_directives_global() {
+ // test parse_directives with no crate
+ let dirs = parse_directives("warn,crate2=debug");
+ assert_eq!(dirs.len(), 2, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, None);
+ assert_eq!(dirs[0].level, LevelFilter::WARN);
+ assert_eq!(dirs[1].in_span, None);
+
+ assert_eq!(dirs[1].target, Some("crate2".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[1].in_span, None);
+ }
+
+ // helper function for tests below
+ fn test_parse_bare_level(directive_to_test: &str, level_expected: LevelFilter) {
+ let dirs = parse_directives(directive_to_test);
+ assert_eq!(
+ dirs.len(),
+ 1,
+ "\ninput: \"{}\"; parsed: {:#?}",
+ directive_to_test,
+ dirs
+ );
+ assert_eq!(dirs[0].target, None);
+ assert_eq!(dirs[0].level, level_expected);
+ assert_eq!(dirs[0].in_span, None);
+ }
+
+ #[test]
+ fn parse_directives_global_bare_warn_lc() {
+ // test parse_directives with no crate, in isolation, all lowercase
+ test_parse_bare_level("warn", LevelFilter::WARN);
+ }
+
+ #[test]
+ fn parse_directives_global_bare_warn_uc() {
+ // test parse_directives with no crate, in isolation, all uppercase
+ test_parse_bare_level("WARN", LevelFilter::WARN);
+ }
+
+ #[test]
+ fn parse_directives_global_bare_warn_mixed() {
+ // test parse_directives with no crate, in isolation, mixed case
+ test_parse_bare_level("wArN", LevelFilter::WARN);
+ }
+
+ #[test]
+ fn parse_directives_valid_with_spans() {
+ let dirs = parse_directives("crate1::mod1[foo]=error,crate1::mod2[bar],crate2[baz]=debug");
+ assert_eq!(dirs.len(), 3, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("crate1::mod1".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::ERROR);
+ assert_eq!(dirs[0].in_span, Some("foo".to_string()));
+
+ assert_eq!(dirs[1].target, Some("crate1::mod2".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::TRACE);
+ assert_eq!(dirs[1].in_span, Some("bar".to_string()));
+
+ assert_eq!(dirs[2].target, Some("crate2".to_string()));
+ assert_eq!(dirs[2].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[2].in_span, Some("baz".to_string()));
+ }
+
+ #[test]
+ fn parse_directives_with_dash_in_target_name() {
+ let dirs = parse_directives("target-name=info");
+ assert_eq!(dirs.len(), 1, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("target-name".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::INFO);
+ assert_eq!(dirs[0].in_span, None);
+ }
+
+ #[test]
+ fn parse_directives_with_dash_in_span_name() {
+ // Reproduces https://github.com/tokio-rs/tracing/issues/1367
+
+ let dirs = parse_directives("target[span-name]=info");
+ assert_eq!(dirs.len(), 1, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("target".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::INFO);
+ assert_eq!(dirs[0].in_span, Some("span-name".to_string()));
+ }
+
+ #[test]
+ fn parse_directives_with_special_characters_in_span_name() {
+ let span_name = "!\"#$%&'()*+-./:;<=>?@^_`|~[}";
+
+ let dirs = parse_directives(format!("target[{}]=info", span_name));
+ assert_eq!(dirs.len(), 1, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("target".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::INFO);
+ assert_eq!(dirs[0].in_span, Some(span_name.to_string()));
+ }
+
+ #[test]
+ fn parse_directives_with_invalid_span_chars() {
+ let invalid_span_name = "]{";
+
+ let dirs = parse_directives(format!("target[{}]=info", invalid_span_name));
+ assert_eq!(dirs.len(), 0, "\nparsed: {:#?}", dirs);
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/filter/env/field.rs b/vendor/tracing-subscriber-0.3.3/src/filter/env/field.rs
new file mode 100644
index 000000000..970850f92
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/filter/env/field.rs
@@ -0,0 +1,416 @@
+use matchers::Pattern;
+use std::{
+ cmp::Ordering,
+ error::Error,
+ fmt,
+ str::FromStr,
+ sync::{
+ atomic::{AtomicBool, Ordering::*},
+ Arc,
+ },
+};
+
+use super::{FieldMap, LevelFilter};
+use tracing_core::field::{Field, Visit};
+
+#[derive(Debug, Eq, PartialEq)]
+pub(crate) struct Match {
+ pub(crate) name: String, // TODO: allow match patterns for names?
+ pub(crate) value: Option<ValueMatch>,
+}
+
+#[derive(Debug, Eq, PartialEq)]
+pub(crate) struct CallsiteMatch {
+ pub(crate) fields: FieldMap<ValueMatch>,
+ pub(crate) level: LevelFilter,
+}
+
+#[derive(Debug)]
+pub(crate) struct SpanMatch {
+ fields: FieldMap<(ValueMatch, AtomicBool)>,
+ level: LevelFilter,
+ has_matched: AtomicBool,
+}
+
+pub(crate) struct MatchVisitor<'a> {
+ inner: &'a SpanMatch,
+}
+
+#[derive(Debug, Clone)]
+pub(crate) enum ValueMatch {
+ Bool(bool),
+ F64(f64),
+ U64(u64),
+ I64(i64),
+ NaN,
+ Pat(Box<MatchPattern>),
+}
+
+impl Eq for ValueMatch {}
+
+impl PartialEq for ValueMatch {
+ fn eq(&self, other: &Self) -> bool {
+ use ValueMatch::*;
+ match (self, other) {
+ (Bool(a), Bool(b)) => a.eq(b),
+ (F64(a), F64(b)) => {
+ debug_assert!(!a.is_nan());
+ debug_assert!(!b.is_nan());
+
+ a.eq(b)
+ }
+ (U64(a), U64(b)) => a.eq(b),
+ (I64(a), I64(b)) => a.eq(b),
+ (NaN, NaN) => true,
+ (Pat(a), Pat(b)) => a.eq(b),
+ _ => false,
+ }
+ }
+}
+
+impl Ord for ValueMatch {
+ fn cmp(&self, other: &Self) -> Ordering {
+ use ValueMatch::*;
+ match (self, other) {
+ (Bool(this), Bool(that)) => this.cmp(that),
+ (Bool(_), _) => Ordering::Less,
+
+ (F64(this), F64(that)) => this
+ .partial_cmp(that)
+ .expect("`ValueMatch::F64` may not contain `NaN` values"),
+ (F64(_), Bool(_)) => Ordering::Greater,
+ (F64(_), _) => Ordering::Less,
+
+ (NaN, NaN) => Ordering::Equal,
+ (NaN, Bool(_)) | (NaN, F64(_)) => Ordering::Greater,
+ (NaN, _) => Ordering::Less,
+
+ (U64(this), U64(that)) => this.cmp(that),
+ (U64(_), Bool(_)) | (U64(_), F64(_)) | (U64(_), NaN) => Ordering::Greater,
+ (U64(_), _) => Ordering::Less,
+
+ (I64(this), I64(that)) => this.cmp(that),
+ (I64(_), Bool(_)) | (I64(_), F64(_)) | (I64(_), NaN) | (I64(_), U64(_)) => {
+ Ordering::Greater
+ }
+ (I64(_), _) => Ordering::Less,
+
+ (Pat(this), Pat(that)) => this.cmp(that),
+ (Pat(_), _) => Ordering::Greater,
+ }
+ }
+}
+
+impl PartialOrd for ValueMatch {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ Some(self.cmp(other))
+ }
+}
+
+#[derive(Debug, Clone)]
+pub(crate) struct MatchPattern {
+ pub(crate) matcher: Pattern,
+ pattern: Arc<str>,
+}
+
+/// Indicates that a field name specified in a filter directive was invalid.
+#[derive(Clone, Debug)]
+#[cfg_attr(docsrs, doc(cfg(feature = "env-filter")))]
+pub struct BadName {
+ name: String,
+}
+
+// === impl Match ===
+
+impl FromStr for Match {
+ type Err = Box<dyn Error + Send + Sync>;
+ fn from_str(s: &str) -> Result<Self, Self::Err> {
+ let mut parts = s.split('=');
+ let name = parts
+ .next()
+ .ok_or_else(|| BadName {
+ name: "".to_string(),
+ })?
+ // TODO: validate field name
+ .to_string();
+ let value = parts.next().map(ValueMatch::from_str).transpose()?;
+ Ok(Match { name, value })
+ }
+}
+
+impl Match {
+ pub(crate) fn has_value(&self) -> bool {
+ self.value.is_some()
+ }
+
+ // TODO: reference count these strings?
+ pub(crate) fn name(&self) -> String {
+ self.name.clone()
+ }
+}
+
+impl fmt::Display for Match {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ fmt::Display::fmt(&self.name, f)?;
+ if let Some(ref value) = self.value {
+ write!(f, "={}", value)?;
+ }
+ Ok(())
+ }
+}
+
+impl Ord for Match {
+ fn cmp(&self, other: &Self) -> Ordering {
+ // Ordering for `Match` directives is based first on _whether_ a value
+ // is matched or not. This is semantically meaningful --- we would
+ // prefer to check directives that match values first as they are more
+ // specific.
+ let has_value = match (self.value.as_ref(), other.value.as_ref()) {
+ (Some(_), None) => Ordering::Greater,
+ (None, Some(_)) => Ordering::Less,
+ _ => Ordering::Equal,
+ };
+ // If both directives match a value, we fall back to the field names in
+ // length + lexicographic ordering, and if these are equal as well, we
+ // compare the match directives.
+ //
+ // This ordering is no longer semantically meaningful but is necessary
+ // so that the directives can be stored in the `BTreeMap` in a defined
+ // order.
+ has_value
+ .then_with(|| self.name.cmp(&other.name))
+ .then_with(|| self.value.cmp(&other.value))
+ }
+}
+
+impl PartialOrd for Match {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ Some(self.cmp(other))
+ }
+}
+
+// === impl ValueMatch ===
+
+fn value_match_f64(v: f64) -> ValueMatch {
+ if v.is_nan() {
+ ValueMatch::NaN
+ } else {
+ ValueMatch::F64(v)
+ }
+}
+
+impl FromStr for ValueMatch {
+ type Err = matchers::Error;
+ fn from_str(s: &str) -> Result<Self, Self::Err> {
+ s.parse::<bool>()
+ .map(ValueMatch::Bool)
+ .or_else(|_| s.parse::<u64>().map(ValueMatch::U64))
+ .or_else(|_| s.parse::<i64>().map(ValueMatch::I64))
+ .or_else(|_| s.parse::<f64>().map(value_match_f64))
+ .or_else(|_| {
+ s.parse::<MatchPattern>()
+ .map(|p| ValueMatch::Pat(Box::new(p)))
+ })
+ }
+}
+
+impl fmt::Display for ValueMatch {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self {
+ ValueMatch::Bool(ref inner) => fmt::Display::fmt(inner, f),
+ ValueMatch::F64(ref inner) => fmt::Display::fmt(inner, f),
+ ValueMatch::NaN => fmt::Display::fmt(&std::f64::NAN, f),
+ ValueMatch::I64(ref inner) => fmt::Display::fmt(inner, f),
+ ValueMatch::U64(ref inner) => fmt::Display::fmt(inner, f),
+ ValueMatch::Pat(ref inner) => fmt::Display::fmt(inner, f),
+ }
+ }
+}
+
+// === impl MatchPattern ===
+
+impl FromStr for MatchPattern {
+ type Err = matchers::Error;
+ fn from_str(s: &str) -> Result<Self, Self::Err> {
+ let matcher = s.parse::<Pattern>()?;
+ Ok(Self {
+ matcher,
+ pattern: s.to_owned().into(),
+ })
+ }
+}
+
+impl fmt::Display for MatchPattern {
+ #[inline]
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ fmt::Display::fmt(&*self.pattern, f)
+ }
+}
+
+impl AsRef<str> for MatchPattern {
+ #[inline]
+ fn as_ref(&self) -> &str {
+ self.pattern.as_ref()
+ }
+}
+
+impl MatchPattern {
+ #[inline]
+ fn str_matches(&self, s: &impl AsRef<str>) -> bool {
+ self.matcher.matches(s)
+ }
+
+ #[inline]
+ fn debug_matches(&self, d: &impl fmt::Debug) -> bool {
+ self.matcher.debug_matches(d)
+ }
+}
+
+impl PartialEq for MatchPattern {
+ #[inline]
+ fn eq(&self, other: &Self) -> bool {
+ self.pattern == other.pattern
+ }
+}
+
+impl Eq for MatchPattern {}
+
+impl PartialOrd for MatchPattern {
+ #[inline]
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ Some(self.pattern.cmp(&other.pattern))
+ }
+}
+
+impl Ord for MatchPattern {
+ #[inline]
+ fn cmp(&self, other: &Self) -> Ordering {
+ self.pattern.cmp(&other.pattern)
+ }
+}
+
+// === impl BadName ===
+
+impl Error for BadName {}
+
+impl fmt::Display for BadName {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "invalid field name `{}`", self.name)
+ }
+}
+
+impl CallsiteMatch {
+ pub(crate) fn to_span_match(&self) -> SpanMatch {
+ let fields = self
+ .fields
+ .iter()
+ .map(|(k, v)| (k.clone(), (v.clone(), AtomicBool::new(false))))
+ .collect();
+ SpanMatch {
+ fields,
+ level: self.level,
+ has_matched: AtomicBool::new(false),
+ }
+ }
+}
+
+impl SpanMatch {
+ pub(crate) fn visitor(&self) -> MatchVisitor<'_> {
+ MatchVisitor { inner: self }
+ }
+
+ #[inline]
+ pub(crate) fn is_matched(&self) -> bool {
+ if self.has_matched.load(Acquire) {
+ return true;
+ }
+ self.is_matched_slow()
+ }
+
+ #[inline(never)]
+ fn is_matched_slow(&self) -> bool {
+ let matched = self
+ .fields
+ .values()
+ .all(|(_, matched)| matched.load(Acquire));
+ if matched {
+ self.has_matched.store(true, Release);
+ }
+ matched
+ }
+
+ #[inline]
+ pub(crate) fn filter(&self) -> Option<LevelFilter> {
+ if self.is_matched() {
+ Some(self.level)
+ } else {
+ None
+ }
+ }
+}
+
+impl<'a> Visit for MatchVisitor<'a> {
+ fn record_f64(&mut self, field: &Field, value: f64) {
+ match self.inner.fields.get(field) {
+ Some((ValueMatch::NaN, ref matched)) if value.is_nan() => {
+ matched.store(true, Release);
+ }
+ Some((ValueMatch::F64(ref e), ref matched))
+ if (value - *e).abs() < std::f64::EPSILON =>
+ {
+ matched.store(true, Release);
+ }
+ _ => {}
+ }
+ }
+
+ fn record_i64(&mut self, field: &Field, value: i64) {
+ use std::convert::TryInto;
+
+ match self.inner.fields.get(field) {
+ Some((ValueMatch::I64(ref e), ref matched)) if value == *e => {
+ matched.store(true, Release);
+ }
+ Some((ValueMatch::U64(ref e), ref matched)) if Ok(value) == (*e).try_into() => {
+ matched.store(true, Release);
+ }
+ _ => {}
+ }
+ }
+
+ fn record_u64(&mut self, field: &Field, value: u64) {
+ match self.inner.fields.get(field) {
+ Some((ValueMatch::U64(ref e), ref matched)) if value == *e => {
+ matched.store(true, Release);
+ }
+ _ => {}
+ }
+ }
+
+ fn record_bool(&mut self, field: &Field, value: bool) {
+ match self.inner.fields.get(field) {
+ Some((ValueMatch::Bool(ref e), ref matched)) if value == *e => {
+ matched.store(true, Release);
+ }
+ _ => {}
+ }
+ }
+
+ fn record_str(&mut self, field: &Field, value: &str) {
+ match self.inner.fields.get(field) {
+ Some((ValueMatch::Pat(ref e), ref matched)) if e.str_matches(&value) => {
+ matched.store(true, Release);
+ }
+ _ => {}
+ }
+ }
+
+ fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
+ match self.inner.fields.get(field) {
+ Some((ValueMatch::Pat(ref e), ref matched)) if e.debug_matches(&value) => {
+ matched.store(true, Release);
+ }
+ _ => {}
+ }
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/filter/env/mod.rs b/vendor/tracing-subscriber-0.3.3/src/filter/env/mod.rs
new file mode 100644
index 000000000..81fe0e62d
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/filter/env/mod.rs
@@ -0,0 +1,738 @@
+//! A `Layer` that enables or disables spans and events based on a set of
+//! filtering directives.
+
+// these are publicly re-exported, but the compiler doesn't realize
+// that for some reason.
+#[allow(unreachable_pub)]
+pub use self::{directive::Directive, field::BadName as BadFieldName};
+mod directive;
+mod field;
+
+use crate::{
+ filter::LevelFilter,
+ layer::{Context, Layer},
+ sync::RwLock,
+};
+use directive::ParseError;
+use std::{cell::RefCell, collections::HashMap, env, error::Error, fmt, str::FromStr};
+use tracing_core::{
+ callsite,
+ field::Field,
+ span,
+ subscriber::{Interest, Subscriber},
+ Metadata,
+};
+
+/// A [`Layer`] which filters spans and events based on a set of filter
+/// directives.
+///
+/// # Directives
+///
+/// A filter consists of one or more comma-separated directives which match on [`Span`]s and [`Event`]s.
+/// Each directive may have a corresponding maximum verbosity [`level`] which
+/// enables (e.g., _selects for_) spans and events that match. Like `log`,
+/// `tracing` considers less exclusive levels (like `trace` or `info`) to be more
+/// verbose than more exclusive levels (like `error` or `warn`).
+///
+/// The directive syntax is similar to that of [`env_logger`]'s. At a high level, the syntax for directives
+/// consists of several parts:
+///
+/// ```text
+/// target[span{field=value}]=level
+/// ```
+///
+/// Each component (`target`, `span`, `field`, `value`, and `level`) will be covered in turn.
+///
+/// - `target` matches the event or span's target. In general, this is the module path and/or crate name.
+/// Examples of targets `h2`, `tokio::net`, or `tide::server`. For more information on targets,
+/// please refer to [`Metadata`]'s documentation.
+/// - `span` matches on the span's name. If a `span` directive is provided alongside a `target`,
+/// the `span` directive will match on spans _within_ the `target`.
+/// - `field` matches on [fields] within spans. Field names can also be supplied without a `value`
+/// and will match on any [`Span`] or [`Event`] that has a field with that name.
+/// For example: `[span{field=\"value\"}]=debug`, `[{field}]=trace`.
+/// - `value` matches on the value of a span's field. If a value is a numeric literal or a bool,
+/// it will match _only_ on that value. Otherwise, this filter acts as a regex on
+/// the `std::fmt::Debug` output from the value.
+/// - `level` sets a maximum verbosity level accepted by this directive.
+///
+/// ## Usage Notes
+///
+/// - The portion of the directive which is included within the square brackets is `tracing`-specific.
+/// - Any portion of the directive can be omitted.
+/// - The sole exception are the `field` and `value` directives. If a `value` is provided,
+/// a `field` must _also_ be provided. However, the converse does not hold, as fields can
+/// be matched without a value.
+/// - If only a level is provided, it will set the maximum level for all `Span`s and `Event`s
+/// that are not enabled by other filters.
+/// - A directive without a level will enable anything that it matches. This is equivalent to `=trace`.
+/// - When a crate has a dash in its name, the default target for events will be the
+/// crate's module path as it appears in Rust. This means every dash will be replaced
+/// with an underscore.
+/// - A dash in a target will only appear when being specified explicitly:
+/// `tracing::info!(target: "target-name", ...);`
+///
+/// ## Examples
+///
+/// - `tokio::net=info` will enable all spans or events that:
+/// - have the `tokio::net` target,
+/// - at the level `info` or above.
+/// - `warn,tokio::net=info` will enable all spans and events that:
+/// - are at the level `warn` or above, *or*
+/// - have the `tokio::net` target at the level `info` or above.
+/// - `my_crate[span_a]=trace` will enable all spans and events that:
+/// - are within the `span_a` span or named `span_a` _if_ `span_a` has the target `my_crate`,
+/// - at the level `trace` or above.
+/// - `[span_b{name=\"bob\"}]` will enable all spans or event that:
+/// - have _any_ target,
+/// - are inside a span named `span_b`,
+/// - which has a field named `name` with value `bob`,
+/// - at _any_ level.
+///
+/// The [`Targets`] type implements a similar form of filtering, but without the
+/// ability to dynamically enable events based on the current span context, and
+/// without filtering on field values. When these features are not required,
+/// [`Targets`] provides a lighter-weight alternative to [`EnvFilter`].
+///
+/// [`Span`]: tracing_core::span
+/// [fields]: tracing_core::Field
+/// [`Event`]: tracing_core::Event
+/// [`level`]: tracing_core::Level
+/// [`Metadata`]: tracing_core::Metadata
+/// [`Targets`]: crate::filter::Targets
+#[cfg_attr(docsrs, doc(cfg(all(feature = "env-filter", feature = "std"))))]
+#[derive(Debug)]
+pub struct EnvFilter {
+ statics: directive::Statics,
+ dynamics: directive::Dynamics,
+ has_dynamics: bool,
+ by_id: RwLock<HashMap<span::Id, directive::SpanMatcher>>,
+ by_cs: RwLock<HashMap<callsite::Identifier, directive::CallsiteMatcher>>,
+}
+
+thread_local! {
+ static SCOPE: RefCell<Vec<LevelFilter>> = RefCell::new(Vec::new());
+}
+
+type FieldMap<T> = HashMap<Field, T>;
+
+/// Indicates that an error occurred while parsing a `EnvFilter` from an
+/// environment variable.
+#[cfg_attr(docsrs, doc(cfg(all(feature = "env-filter", feature = "std"))))]
+#[derive(Debug)]
+pub struct FromEnvError {
+ kind: ErrorKind,
+}
+
+#[derive(Debug)]
+enum ErrorKind {
+ Parse(ParseError),
+ Env(env::VarError),
+}
+
+impl EnvFilter {
+ /// `RUST_LOG` is the default environment variable used by
+ /// [`EnvFilter::from_default_env`] and [`EnvFilter::try_from_default_env`].
+ ///
+ /// [`EnvFilter::from_default_env`]: #method.from_default_env
+ /// [`EnvFilter::try_from_default_env`]: #method.try_from_default_env
+ pub const DEFAULT_ENV: &'static str = "RUST_LOG";
+
+ /// Returns a new `EnvFilter` from the value of the `RUST_LOG` environment
+ /// variable, ignoring any invalid filter directives.
+ pub fn from_default_env() -> Self {
+ Self::from_env(Self::DEFAULT_ENV)
+ }
+
+ /// Returns a new `EnvFilter` from the value of the given environment
+ /// variable, ignoring any invalid filter directives.
+ pub fn from_env<A: AsRef<str>>(env: A) -> Self {
+ env::var(env.as_ref()).map(Self::new).unwrap_or_default()
+ }
+
+ /// Returns a new `EnvFilter` from the directives in the given string,
+ /// ignoring any that are invalid.
+ pub fn new<S: AsRef<str>>(dirs: S) -> Self {
+ let directives = dirs.as_ref().split(',').filter_map(|s| match s.parse() {
+ Ok(d) => Some(d),
+ Err(err) => {
+ eprintln!("ignoring `{}`: {}", s, err);
+ None
+ }
+ });
+ Self::from_directives(directives)
+ }
+
+ /// Returns a new `EnvFilter` from the directives in the given string,
+ /// or an error if any are invalid.
+ pub fn try_new<S: AsRef<str>>(dirs: S) -> Result<Self, directive::ParseError> {
+ let directives = dirs
+ .as_ref()
+ .split(',')
+ .map(|s| s.parse())
+ .collect::<Result<Vec<_>, _>>()?;
+ Ok(Self::from_directives(directives))
+ }
+
+ /// Returns a new `EnvFilter` from the value of the `RUST_LOG` environment
+ /// variable, or an error if the environment variable contains any invalid
+ /// filter directives.
+ pub fn try_from_default_env() -> Result<Self, FromEnvError> {
+ Self::try_from_env(Self::DEFAULT_ENV)
+ }
+
+ /// Returns a new `EnvFilter` from the value of the given environment
+ /// variable, or an error if the environment variable is unset or contains
+ /// any invalid filter directives.
+ pub fn try_from_env<A: AsRef<str>>(env: A) -> Result<Self, FromEnvError> {
+ env::var(env.as_ref())?.parse().map_err(Into::into)
+ }
+
+ /// Add a filtering directive to this `EnvFilter`.
+ ///
+ /// The added directive will be used in addition to any previously set
+ /// directives, either added using this method or provided when the filter
+ /// is constructed.
+ ///
+ /// Filters may be created from [`LevelFilter`] or [`Level`], which will
+ /// enable all traces at or below a certain verbosity level, or
+ /// parsed from a string specifying a directive.
+ ///
+ /// If a filter directive is inserted that matches exactly the same spans
+ /// and events as a previous filter, but sets a different level for those
+ /// spans and events, the previous directive is overwritten.
+ ///
+ /// [`LevelFilter`]: ../filter/struct.LevelFilter.html
+ /// [`Level`]: https://docs.rs/tracing-core/latest/tracing_core/struct.Level.html
+ ///
+ /// # Examples
+ ///
+ /// From [`LevelFilter`]:
+ ////
+ /// ```rust
+ /// use tracing_subscriber::filter::{EnvFilter, LevelFilter};
+ /// let mut filter = EnvFilter::from_default_env()
+ /// .add_directive(LevelFilter::INFO.into());
+ /// ```
+ ///
+ /// Or from [`Level`]:
+ ///
+ /// ```rust
+ /// # use tracing_subscriber::filter::{EnvFilter, LevelFilter};
+ /// # use tracing::Level;
+ /// let mut filter = EnvFilter::from_default_env()
+ /// .add_directive(Level::INFO.into());
+ /// ```
+ ////
+ /// Parsed from a string:
+ ////
+ /// ```rust
+ /// use tracing_subscriber::filter::{EnvFilter, Directive};
+ ///
+ /// # fn try_mk_filter() -> Result<(), Box<dyn ::std::error::Error>> {
+ /// let mut filter = EnvFilter::try_from_default_env()?
+ /// .add_directive("my_crate::module=trace".parse()?)
+ /// .add_directive("my_crate::my_other_module::something=info".parse()?);
+ /// # Ok(())
+ /// # }
+ /// ```
+ pub fn add_directive(mut self, directive: Directive) -> Self {
+ if let Some(stat) = directive.to_static() {
+ self.statics.add(stat)
+ } else {
+ self.has_dynamics = true;
+ self.dynamics.add(directive);
+ }
+ self
+ }
+
+ fn from_directives(directives: impl IntoIterator<Item = Directive>) -> Self {
+ use tracing::level_filters::STATIC_MAX_LEVEL;
+ use tracing::Level;
+
+ let directives: Vec<_> = directives.into_iter().collect();
+
+ let disabled: Vec<_> = directives
+ .iter()
+ .filter(|directive| directive.level > STATIC_MAX_LEVEL)
+ .collect();
+
+ if !disabled.is_empty() {
+ #[cfg(feature = "ansi_term")]
+ use ansi_term::{Color, Style};
+ // NOTE: We can't use a configured `MakeWriter` because the EnvFilter
+ // has no knowledge of any underlying subscriber or subscriber, which
+ // may or may not use a `MakeWriter`.
+ let warn = |msg: &str| {
+ #[cfg(not(feature = "ansi_term"))]
+ let msg = format!("warning: {}", msg);
+ #[cfg(feature = "ansi_term")]
+ let msg = {
+ let bold = Style::new().bold();
+ let mut warning = Color::Yellow.paint("warning");
+ warning.style_ref_mut().is_bold = true;
+ format!("{}{} {}", warning, bold.paint(":"), bold.paint(msg))
+ };
+ eprintln!("{}", msg);
+ };
+ let ctx_prefixed = |prefix: &str, msg: &str| {
+ #[cfg(not(feature = "ansi_term"))]
+ let msg = format!("note: {}", msg);
+ #[cfg(feature = "ansi_term")]
+ let msg = {
+ let mut equal = Color::Fixed(21).paint("="); // dark blue
+ equal.style_ref_mut().is_bold = true;
+ format!(" {} {} {}", equal, Style::new().bold().paint(prefix), msg)
+ };
+ eprintln!("{}", msg);
+ };
+ let ctx_help = |msg| ctx_prefixed("help:", msg);
+ let ctx_note = |msg| ctx_prefixed("note:", msg);
+ let ctx = |msg: &str| {
+ #[cfg(not(feature = "ansi_term"))]
+ let msg = format!("note: {}", msg);
+ #[cfg(feature = "ansi_term")]
+ let msg = {
+ let mut pipe = Color::Fixed(21).paint("|");
+ pipe.style_ref_mut().is_bold = true;
+ format!(" {} {}", pipe, msg)
+ };
+ eprintln!("{}", msg);
+ };
+ warn("some trace filter directives would enable traces that are disabled statically");
+ for directive in disabled {
+ let target = if let Some(target) = &directive.target {
+ format!("the `{}` target", target)
+ } else {
+ "all targets".into()
+ };
+ let level = directive
+ .level
+ .into_level()
+ .expect("=off would not have enabled any filters");
+ ctx(&format!(
+ "`{}` would enable the {} level for {}",
+ directive, level, target
+ ));
+ }
+ ctx_note(&format!("the static max level is `{}`", STATIC_MAX_LEVEL));
+ let help_msg = || {
+ let (feature, filter) = match STATIC_MAX_LEVEL.into_level() {
+ Some(Level::TRACE) => unreachable!(
+ "if the max level is trace, no static filtering features are enabled"
+ ),
+ Some(Level::DEBUG) => ("max_level_debug", Level::TRACE),
+ Some(Level::INFO) => ("max_level_info", Level::DEBUG),
+ Some(Level::WARN) => ("max_level_warn", Level::INFO),
+ Some(Level::ERROR) => ("max_level_error", Level::WARN),
+ None => return ("max_level_off", String::new()),
+ };
+ (feature, format!("{} ", filter))
+ };
+ let (feature, earlier_level) = help_msg();
+ ctx_help(&format!(
+ "to enable {}logging, remove the `{}` feature",
+ earlier_level, feature
+ ));
+ }
+
+ let (dynamics, mut statics) = Directive::make_tables(directives);
+ let has_dynamics = !dynamics.is_empty();
+
+ if statics.is_empty() && !has_dynamics {
+ statics.add(directive::StaticDirective::default());
+ }
+
+ Self {
+ statics,
+ dynamics,
+ has_dynamics,
+ by_id: RwLock::new(HashMap::new()),
+ by_cs: RwLock::new(HashMap::new()),
+ }
+ }
+
+ fn cares_about_span(&self, span: &span::Id) -> bool {
+ let spans = try_lock!(self.by_id.read(), else return false);
+ spans.contains_key(span)
+ }
+
+ fn base_interest(&self) -> Interest {
+ if self.has_dynamics {
+ Interest::sometimes()
+ } else {
+ Interest::never()
+ }
+ }
+}
+
+impl<S: Subscriber> Layer<S> for EnvFilter {
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ if self.has_dynamics && metadata.is_span() {
+ // If this metadata describes a span, first, check if there is a
+ // dynamic filter that should be constructed for it. If so, it
+ // should always be enabled, since it influences filtering.
+ if let Some(matcher) = self.dynamics.matcher(metadata) {
+ let mut by_cs = try_lock!(self.by_cs.write(), else return self.base_interest());
+ by_cs.insert(metadata.callsite(), matcher);
+ return Interest::always();
+ }
+ }
+
+ // Otherwise, check if any of our static filters enable this metadata.
+ if self.statics.enabled(metadata) {
+ Interest::always()
+ } else {
+ self.base_interest()
+ }
+ }
+
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ if self.dynamics.has_value_filters() {
+ // If we perform any filtering on span field *values*, we will
+ // enable *all* spans, because their field values are not known
+ // until recording.
+ return Some(LevelFilter::TRACE);
+ }
+ std::cmp::max(
+ self.statics.max_level.into(),
+ self.dynamics.max_level.into(),
+ )
+ }
+
+ fn enabled(&self, metadata: &Metadata<'_>, _: Context<'_, S>) -> bool {
+ let level = metadata.level();
+
+ // is it possible for a dynamic filter directive to enable this event?
+ // if not, we can avoid the thread local access + iterating over the
+ // spans in the current scope.
+ if self.has_dynamics && self.dynamics.max_level >= *level {
+ if metadata.is_span() {
+ // If the metadata is a span, see if we care about its callsite.
+ let enabled_by_cs = self
+ .by_cs
+ .read()
+ .ok()
+ .map(|by_cs| by_cs.contains_key(&metadata.callsite()))
+ .unwrap_or(false);
+ if enabled_by_cs {
+ return true;
+ }
+ }
+
+ let enabled_by_scope = SCOPE.with(|scope| {
+ for filter in scope.borrow().iter() {
+ if filter >= level {
+ return true;
+ }
+ }
+ false
+ });
+ if enabled_by_scope {
+ return true;
+ }
+ }
+
+ // is it possible for a static filter directive to enable this event?
+ if self.statics.max_level >= *level {
+ // Otherwise, fall back to checking if the callsite is
+ // statically enabled.
+ return self.statics.enabled(metadata);
+ }
+
+ false
+ }
+
+ fn on_new_span(&self, attrs: &span::Attributes<'_>, id: &span::Id, _: Context<'_, S>) {
+ let by_cs = try_lock!(self.by_cs.read());
+ if let Some(cs) = by_cs.get(&attrs.metadata().callsite()) {
+ let span = cs.to_span_match(attrs);
+ try_lock!(self.by_id.write()).insert(id.clone(), span);
+ }
+ }
+
+ fn on_record(&self, id: &span::Id, values: &span::Record<'_>, _: Context<'_, S>) {
+ if let Some(span) = try_lock!(self.by_id.read()).get(id) {
+ span.record_update(values);
+ }
+ }
+
+ fn on_enter(&self, id: &span::Id, _: Context<'_, S>) {
+ // XXX: This is where _we_ could push IDs to the stack instead, and use
+ // that to allow changing the filter while a span is already entered.
+ // But that might be much less efficient...
+ if let Some(span) = try_lock!(self.by_id.read()).get(id) {
+ SCOPE.with(|scope| scope.borrow_mut().push(span.level()));
+ }
+ }
+
+ fn on_exit(&self, id: &span::Id, _: Context<'_, S>) {
+ if self.cares_about_span(id) {
+ SCOPE.with(|scope| scope.borrow_mut().pop());
+ }
+ }
+
+ fn on_close(&self, id: span::Id, _: Context<'_, S>) {
+ // If we don't need to acquire a write lock, avoid doing so.
+ if !self.cares_about_span(&id) {
+ return;
+ }
+
+ let mut spans = try_lock!(self.by_id.write());
+ spans.remove(&id);
+ }
+}
+
+impl FromStr for EnvFilter {
+ type Err = directive::ParseError;
+
+ fn from_str(spec: &str) -> Result<Self, Self::Err> {
+ Self::try_new(spec)
+ }
+}
+
+impl<S> From<S> for EnvFilter
+where
+ S: AsRef<str>,
+{
+ fn from(s: S) -> Self {
+ Self::new(s)
+ }
+}
+
+impl Default for EnvFilter {
+ fn default() -> Self {
+ Self::from_directives(std::iter::empty())
+ }
+}
+
+impl fmt::Display for EnvFilter {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let mut statics = self.statics.iter();
+ let wrote_statics = if let Some(next) = statics.next() {
+ fmt::Display::fmt(next, f)?;
+ for directive in statics {
+ write!(f, ",{}", directive)?;
+ }
+ true
+ } else {
+ false
+ };
+
+ let mut dynamics = self.dynamics.iter();
+ if let Some(next) = dynamics.next() {
+ if wrote_statics {
+ f.write_str(",")?;
+ }
+ fmt::Display::fmt(next, f)?;
+ for directive in dynamics {
+ write!(f, ",{}", directive)?;
+ }
+ }
+ Ok(())
+ }
+}
+
+// ===== impl FromEnvError =====
+
+impl From<directive::ParseError> for FromEnvError {
+ fn from(p: directive::ParseError) -> Self {
+ Self {
+ kind: ErrorKind::Parse(p),
+ }
+ }
+}
+
+impl From<env::VarError> for FromEnvError {
+ fn from(v: env::VarError) -> Self {
+ Self {
+ kind: ErrorKind::Env(v),
+ }
+ }
+}
+
+impl fmt::Display for FromEnvError {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self.kind {
+ ErrorKind::Parse(ref p) => p.fmt(f),
+ ErrorKind::Env(ref e) => e.fmt(f),
+ }
+ }
+}
+
+impl Error for FromEnvError {
+ fn source(&self) -> Option<&(dyn Error + 'static)> {
+ match self.kind {
+ ErrorKind::Parse(ref p) => Some(p),
+ ErrorKind::Env(ref e) => Some(e),
+ }
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use tracing_core::field::FieldSet;
+ use tracing_core::*;
+
+ struct NoSubscriber;
+ impl Subscriber for NoSubscriber {
+ #[inline]
+ fn register_callsite(&self, _: &'static Metadata<'static>) -> subscriber::Interest {
+ subscriber::Interest::always()
+ }
+ fn new_span(&self, _: &span::Attributes<'_>) -> span::Id {
+ span::Id::from_u64(0xDEAD)
+ }
+ fn event(&self, _event: &Event<'_>) {}
+ fn record(&self, _span: &span::Id, _values: &span::Record<'_>) {}
+ fn record_follows_from(&self, _span: &span::Id, _follows: &span::Id) {}
+
+ #[inline]
+ fn enabled(&self, _metadata: &Metadata<'_>) -> bool {
+ true
+ }
+ fn enter(&self, _span: &span::Id) {}
+ fn exit(&self, _span: &span::Id) {}
+ }
+
+ struct Cs;
+ impl Callsite for Cs {
+ fn set_interest(&self, _interest: Interest) {}
+ fn metadata(&self) -> &Metadata<'_> {
+ unimplemented!()
+ }
+ }
+
+ #[test]
+ fn callsite_enabled_no_span_directive() {
+ let filter = EnvFilter::new("app=debug").with_subscriber(NoSubscriber);
+ static META: &Metadata<'static> = &Metadata::new(
+ "mySpan",
+ "app",
+ Level::TRACE,
+ None,
+ None,
+ None,
+ FieldSet::new(&[], identify_callsite!(&Cs)),
+ Kind::SPAN,
+ );
+
+ let interest = filter.register_callsite(META);
+ assert!(interest.is_never());
+ }
+
+ #[test]
+ fn callsite_off() {
+ let filter = EnvFilter::new("app=off").with_subscriber(NoSubscriber);
+ static META: &Metadata<'static> = &Metadata::new(
+ "mySpan",
+ "app",
+ Level::ERROR,
+ None,
+ None,
+ None,
+ FieldSet::new(&[], identify_callsite!(&Cs)),
+ Kind::SPAN,
+ );
+
+ let interest = filter.register_callsite(META);
+ assert!(interest.is_never());
+ }
+
+ #[test]
+ fn callsite_enabled_includes_span_directive() {
+ let filter = EnvFilter::new("app[mySpan]=debug").with_subscriber(NoSubscriber);
+ static META: &Metadata<'static> = &Metadata::new(
+ "mySpan",
+ "app",
+ Level::TRACE,
+ None,
+ None,
+ None,
+ FieldSet::new(&[], identify_callsite!(&Cs)),
+ Kind::SPAN,
+ );
+
+ let interest = filter.register_callsite(META);
+ assert!(interest.is_always());
+ }
+
+ #[test]
+ fn callsite_enabled_includes_span_directive_field() {
+ let filter =
+ EnvFilter::new("app[mySpan{field=\"value\"}]=debug").with_subscriber(NoSubscriber);
+ static META: &Metadata<'static> = &Metadata::new(
+ "mySpan",
+ "app",
+ Level::TRACE,
+ None,
+ None,
+ None,
+ FieldSet::new(&["field"], identify_callsite!(&Cs)),
+ Kind::SPAN,
+ );
+
+ let interest = filter.register_callsite(META);
+ assert!(interest.is_always());
+ }
+
+ #[test]
+ fn callsite_enabled_includes_span_directive_multiple_fields() {
+ let filter = EnvFilter::new("app[mySpan{field=\"value\",field2=2}]=debug")
+ .with_subscriber(NoSubscriber);
+ static META: &Metadata<'static> = &Metadata::new(
+ "mySpan",
+ "app",
+ Level::TRACE,
+ None,
+ None,
+ None,
+ FieldSet::new(&["field"], identify_callsite!(&Cs)),
+ Kind::SPAN,
+ );
+
+ let interest = filter.register_callsite(META);
+ assert!(interest.is_never());
+ }
+
+ #[test]
+ fn roundtrip() {
+ let f1: EnvFilter =
+ "[span1{foo=1}]=error,[span2{bar=2 baz=false}],crate2[{quux=\"quuux\"}]=debug"
+ .parse()
+ .unwrap();
+ let f2: EnvFilter = format!("{}", f1).parse().unwrap();
+ assert_eq!(f1.statics, f2.statics);
+ assert_eq!(f1.dynamics, f2.dynamics);
+ }
+
+ #[test]
+ fn size_of_filters() {
+ fn print_sz(s: &str) {
+ let filter = s.parse::<EnvFilter>().expect("filter should parse");
+ println!(
+ "size_of_val({:?})\n -> {}B",
+ s,
+ std::mem::size_of_val(&filter)
+ );
+ }
+
+ print_sz("info");
+
+ print_sz("foo=debug");
+
+ print_sz(
+ "crate1::mod1=error,crate1::mod2=warn,crate1::mod2::mod3=info,\
+ crate2=debug,crate3=trace,crate3::mod2::mod1=off",
+ );
+
+ print_sz("[span1{foo=1}]=error,[span2{bar=2 baz=false}],crate2[{quux=\"quuux\"}]=debug");
+
+ print_sz(
+ "crate1::mod1=error,crate1::mod2=warn,crate1::mod2::mod3=info,\
+ crate2=debug,crate3=trace,crate3::mod2::mod1=off,[span1{foo=1}]=error,\
+ [span2{bar=2 baz=false}],crate2[{quux=\"quuux\"}]=debug",
+ );
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/filter/filter_fn.rs b/vendor/tracing-subscriber-0.3.3/src/filter/filter_fn.rs
new file mode 100644
index 000000000..332bf860a
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/filter/filter_fn.rs
@@ -0,0 +1,749 @@
+use crate::{
+ filter::LevelFilter,
+ layer::{Context, Layer},
+};
+use core::{any::type_name, fmt, marker::PhantomData};
+use tracing_core::{Interest, Metadata, Subscriber};
+
+/// A filter implemented by a closure or function pointer that
+/// determines whether a given span or event is enabled, based on its
+/// [`Metadata`].
+///
+/// This type can be used for both [per-layer filtering][plf] (using its
+/// [`Filter`] implementation) and [global filtering][global] (using its
+/// [`Layer`] implementation).
+///
+/// See the [documentation on filtering with layers][filtering] for details.
+///
+/// [`Metadata`]: tracing_core::Metadata
+/// [`Filter`]: crate::layer::Filter
+/// [`Layer`]: crate::layer::Layer
+/// [plf]: crate::layer#per-layer-filtering
+/// [global]: crate::layer#global-filtering
+/// [filtering]: crate::layer#filtering-with-layers
+#[derive(Clone)]
+pub struct FilterFn<F = fn(&Metadata<'_>) -> bool> {
+ enabled: F,
+ max_level_hint: Option<LevelFilter>,
+}
+
+/// A filter implemented by a closure or function pointer that
+/// determines whether a given span or event is enabled _dynamically_,
+/// potentially based on the current [span context].
+///
+/// This type can be used for both [per-layer filtering][plf] (using its
+/// [`Filter`] implementation) and [global filtering][global] (using its
+/// [`Layer`] implementation).
+///
+/// See the [documentation on filtering with layers][filtering] for details.
+///
+/// [span context]: crate::layer::Context
+/// [`Filter`]: crate::layer::Filter
+/// [`Layer`]: crate::layer::Layer
+/// [plf]: crate::layer#per-layer-filtering
+/// [global]: crate::layer#global-filtering
+/// [filtering]: crate::layer#filtering-with-layers
+pub struct DynFilterFn<
+ S,
+ // TODO(eliza): should these just be boxed functions?
+ F = fn(&Metadata<'_>, &Context<'_, S>) -> bool,
+ R = fn(&'static Metadata<'static>) -> Interest,
+> {
+ enabled: F,
+ register_callsite: Option<R>,
+ max_level_hint: Option<LevelFilter>,
+ _s: PhantomData<fn(S)>,
+}
+
+// === impl FilterFn ===
+
+/// Constructs a [`FilterFn`], from a function or closure that returns `true` if
+/// a span or event should be enabled, based on its [`Metadata`].
+///
+/// The returned [`FilterFn`] can be used for both [per-layer filtering][plf]
+/// (using its [`Filter`] implementation) and [global filtering][global] (using
+/// its [`Layer`] implementation).
+///
+/// See the [documentation on filtering with layers][filtering] for details.
+///
+/// This is equivalent to calling [`FilterFn::new`].
+///
+/// [`Metadata`]: tracing_core::Metadata
+/// [`Filter`]: crate::layer::Filter
+/// [`Layer`]: crate::layer::Layer
+/// [plf]: crate::layer#per-layer-filtering
+/// [global]: crate::layer#global-filtering
+/// [filtering]: crate::layer#filtering-with-layers
+///
+/// # Examples
+///
+/// ```
+/// use tracing_subscriber::{
+/// layer::{Layer, SubscriberExt},
+/// filter,
+/// util::SubscriberInitExt,
+/// };
+///
+/// let my_filter = filter::filter_fn(|metadata| {
+/// // Only enable spans or events with the target "interesting_things"
+/// metadata.target() == "interesting_things"
+/// });
+///
+/// let my_layer = tracing_subscriber::fmt::layer();
+///
+/// tracing_subscriber::registry()
+/// .with(my_layer.with_filter(my_filter))
+/// .init();
+///
+/// // This event will not be enabled.
+/// tracing::warn!("something important but uninteresting happened!");
+///
+/// // This event will be enabled.
+/// tracing::debug!(target: "interesting_things", "an interesting minor detail...");
+/// ```
+pub fn filter_fn<F>(f: F) -> FilterFn<F>
+where
+ F: Fn(&Metadata<'_>) -> bool,
+{
+ FilterFn::new(f)
+}
+
+/// Constructs a [`DynFilterFn`] from a function or closure that returns `true`
+/// if a span or event should be enabled within a particular [span context][`Context`].
+///
+/// This is equivalent to calling [`DynFilterFn::new`].
+///
+/// Unlike [`filter_fn`], this function takes a closure or function pointer
+/// taking the [`Metadata`] for a span or event *and* the current [`Context`].
+/// This means that a [`DynFilterFn`] can choose whether to enable spans or
+/// events based on information about the _current_ span (or its parents).
+///
+/// If this is *not* necessary, use [`filter_fn`] instead.
+///
+/// The returned [`DynFilterFn`] can be used for both [per-layer filtering][plf]
+/// (using its [`Filter`] implementation) and [global filtering][global] (using
+/// its [`Layer`] implementation).
+///
+/// See the [documentation on filtering with layers][filtering] for details.
+///
+/// # Examples
+///
+/// ```
+/// use tracing_subscriber::{
+/// layer::{Layer, SubscriberExt},
+/// filter,
+/// util::SubscriberInitExt,
+/// };
+///
+/// // Only enable spans or events within a span named "interesting_span".
+/// let my_filter = filter::dynamic_filter_fn(|metadata, cx| {
+/// // If this *is* "interesting_span", make sure to enable it.
+/// if metadata.is_span() && metadata.name() == "interesting_span" {
+/// return true;
+/// }
+///
+/// // Otherwise, are we in an interesting span?
+/// if let Some(current_span) = cx.lookup_current() {
+/// return current_span.name() == "interesting_span";
+/// }
+///
+/// false
+/// });
+///
+/// let my_layer = tracing_subscriber::fmt::layer();
+///
+/// tracing_subscriber::registry()
+/// .with(my_layer.with_filter(my_filter))
+/// .init();
+///
+/// // This event will not be enabled.
+/// tracing::info!("something happened");
+///
+/// tracing::info_span!("interesting_span").in_scope(|| {
+/// // This event will be enabled.
+/// tracing::debug!("something else happened");
+/// });
+/// ```
+///
+/// [`Filter`]: crate::layer::Filter
+/// [`Layer`]: crate::layer::Layer
+/// [plf]: crate::layer#per-layer-filtering
+/// [global]: crate::layer#global-filtering
+/// [filtering]: crate::layer#filtering-with-layers
+/// [`Context`]: crate::layer::Context
+/// [`Metadata`]: tracing_core::Metadata
+pub fn dynamic_filter_fn<S, F>(f: F) -> DynFilterFn<S, F>
+where
+ F: Fn(&Metadata<'_>, &Context<'_, S>) -> bool,
+{
+ DynFilterFn::new(f)
+}
+
+impl<F> FilterFn<F>
+where
+ F: Fn(&Metadata<'_>) -> bool,
+{
+ /// Constructs a [`FilterFn`] from a function or closure that returns `true`
+ /// if a span or event should be enabled, based on its [`Metadata`].
+ ///
+ /// If determining whether a span or event should be enabled also requires
+ /// information about the current span context, use [`DynFilterFn`] instead.
+ ///
+ /// See the [documentation on per-layer filtering][plf] for details on using
+ /// [`Filter`]s.
+ ///
+ /// [`Filter`]: crate::layer::Filter
+ /// [plf]: crate::layer#per-layer-filtering
+ /// [`Metadata`]: tracing_core::Metadata
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing_subscriber::{
+ /// layer::{Layer, SubscriberExt},
+ /// filter::FilterFn,
+ /// util::SubscriberInitExt,
+ /// };
+ ///
+ /// let my_filter = FilterFn::new(|metadata| {
+ /// // Only enable spans or events with the target "interesting_things"
+ /// metadata.target() == "interesting_things"
+ /// });
+ ///
+ /// let my_layer = tracing_subscriber::fmt::layer();
+ ///
+ /// tracing_subscriber::registry()
+ /// .with(my_layer.with_filter(my_filter))
+ /// .init();
+ ///
+ /// // This event will not be enabled.
+ /// tracing::warn!("something important but uninteresting happened!");
+ ///
+ /// // This event will be enabled.
+ /// tracing::debug!(target: "interesting_things", "an interesting minor detail...");
+ /// ```
+ pub fn new(enabled: F) -> Self {
+ Self {
+ enabled,
+ max_level_hint: None,
+ }
+ }
+
+ /// Sets the highest verbosity [`Level`] the filter function will enable.
+ ///
+ /// The value passed to this method will be returned by this `FilterFn`'s
+ /// [`Filter::max_level_hint`] method.
+ ///
+ /// If the provided function will not enable all levels, it is recommended
+ /// to call this method to configure it with the most verbose level it will
+ /// enable.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing_subscriber::{
+ /// layer::{Layer, SubscriberExt},
+ /// filter::{filter_fn, LevelFilter},
+ /// util::SubscriberInitExt,
+ /// };
+ /// use tracing_core::Level;
+ ///
+ /// let my_filter = filter_fn(|metadata| {
+ /// // Only enable spans or events with targets starting with `my_crate`
+ /// // and levels at or below `INFO`.
+ /// metadata.level() <= &Level::INFO && metadata.target().starts_with("my_crate")
+ /// })
+ /// // Since the filter closure will only enable the `INFO` level and
+ /// // below, set the max level hint
+ /// .with_max_level_hint(LevelFilter::INFO);
+ ///
+ /// let my_layer = tracing_subscriber::fmt::layer();
+ ///
+ /// tracing_subscriber::registry()
+ /// .with(my_layer.with_filter(my_filter))
+ /// .init();
+ /// ```
+ ///
+ /// [`Level`]: tracing_core::Level
+ /// [`Filter::max_level_hint`]: crate::layer::Filter::max_level_hint
+ pub fn with_max_level_hint(self, max_level_hint: impl Into<LevelFilter>) -> Self {
+ Self {
+ max_level_hint: Some(max_level_hint.into()),
+ ..self
+ }
+ }
+
+ #[inline]
+ pub(in crate::filter) fn is_enabled(&self, metadata: &Metadata<'_>) -> bool {
+ let enabled = (self.enabled)(metadata);
+ debug_assert!(
+ !enabled || self.is_below_max_level(metadata),
+ "FilterFn<{}> claimed it would only enable {:?} and below, \
+ but it enabled metadata with the {:?} level\nmetadata={:#?}",
+ type_name::<F>(),
+ self.max_level_hint.unwrap(),
+ metadata.level(),
+ metadata,
+ );
+
+ enabled
+ }
+
+ #[inline]
+ pub(in crate::filter) fn is_callsite_enabled(
+ &self,
+ metadata: &'static Metadata<'static>,
+ ) -> Interest {
+ // Because `self.enabled` takes a `Metadata` only (and no `Context`
+ // parameter), we can reasonably assume its results are cachable, and
+ // just return `Interest::always`/`Interest::never`.
+ if (self.enabled)(metadata) {
+ debug_assert!(
+ self.is_below_max_level(metadata),
+ "FilterFn<{}> claimed it was only interested in {:?} and below, \
+ but it enabled metadata with the {:?} level\nmetadata={:#?}",
+ type_name::<F>(),
+ self.max_level_hint.unwrap(),
+ metadata.level(),
+ metadata,
+ );
+ return Interest::always();
+ }
+
+ Interest::never()
+ }
+
+ fn is_below_max_level(&self, metadata: &Metadata<'_>) -> bool {
+ self.max_level_hint
+ .as_ref()
+ .map(|hint| metadata.level() <= hint)
+ .unwrap_or(true)
+ }
+}
+
+impl<S, F> Layer<S> for FilterFn<F>
+where
+ F: Fn(&Metadata<'_>) -> bool + 'static,
+ S: Subscriber,
+{
+ fn enabled(&self, metadata: &Metadata<'_>, _: Context<'_, S>) -> bool {
+ self.is_enabled(metadata)
+ }
+
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ self.is_callsite_enabled(metadata)
+ }
+
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ self.max_level_hint
+ }
+}
+
+impl<F> From<F> for FilterFn<F>
+where
+ F: Fn(&Metadata<'_>) -> bool,
+{
+ fn from(enabled: F) -> Self {
+ Self::new(enabled)
+ }
+}
+
+impl<F> fmt::Debug for FilterFn<F> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("FilterFn")
+ .field("enabled", &format_args!("{}", type_name::<F>()))
+ .field("max_level_hint", &self.max_level_hint)
+ .finish()
+ }
+}
+
+// === impl DynFilterFn ==
+
+impl<S, F> DynFilterFn<S, F>
+where
+ F: Fn(&Metadata<'_>, &Context<'_, S>) -> bool,
+{
+ /// Constructs a [`Filter`] from a function or closure that returns `true`
+ /// if a span or event should be enabled in the current [span
+ /// context][`Context`].
+ ///
+ /// Unlike [`FilterFn`], a `DynFilterFn` is constructed from a closure or
+ /// function pointer that takes both the [`Metadata`] for a span or event
+ /// *and* the current [`Context`]. This means that a [`DynFilterFn`] can
+ /// choose whether to enable spans or events based on information about the
+ /// _current_ span (or its parents).
+ ///
+ /// If this is *not* necessary, use [`FilterFn`] instead.
+ ///
+ /// See the [documentation on per-layer filtering][plf] for details on using
+ /// [`Filter`]s.
+ ///
+ /// [`Filter`]: crate::layer::Filter
+ /// [plf]: crate::layer#per-layer-filtering
+ /// [`Context`]: crate::layer::Context
+ /// [`Metadata`]: tracing_core::Metadata
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing_subscriber::{
+ /// layer::{Layer, SubscriberExt},
+ /// filter::DynFilterFn,
+ /// util::SubscriberInitExt,
+ /// };
+ ///
+ /// // Only enable spans or events within a span named "interesting_span".
+ /// let my_filter = DynFilterFn::new(|metadata, cx| {
+ /// // If this *is* "interesting_span", make sure to enable it.
+ /// if metadata.is_span() && metadata.name() == "interesting_span" {
+ /// return true;
+ /// }
+ ///
+ /// // Otherwise, are we in an interesting span?
+ /// if let Some(current_span) = cx.lookup_current() {
+ /// return current_span.name() == "interesting_span";
+ /// }
+ ///
+ /// false
+ /// });
+ ///
+ /// let my_layer = tracing_subscriber::fmt::layer();
+ ///
+ /// tracing_subscriber::registry()
+ /// .with(my_layer.with_filter(my_filter))
+ /// .init();
+ ///
+ /// // This event will not be enabled.
+ /// tracing::info!("something happened");
+ ///
+ /// tracing::info_span!("interesting_span").in_scope(|| {
+ /// // This event will be enabled.
+ /// tracing::debug!("something else happened");
+ /// });
+ /// ```
+ pub fn new(enabled: F) -> Self {
+ Self {
+ enabled,
+ register_callsite: None,
+ max_level_hint: None,
+ _s: PhantomData,
+ }
+ }
+}
+
+impl<S, F, R> DynFilterFn<S, F, R>
+where
+ F: Fn(&Metadata<'_>, &Context<'_, S>) -> bool,
+{
+ /// Sets the highest verbosity [`Level`] the filter function will enable.
+ ///
+ /// The value passed to this method will be returned by this `DynFilterFn`'s
+ /// [`Filter::max_level_hint`] method.
+ ///
+ /// If the provided function will not enable all levels, it is recommended
+ /// to call this method to configure it with the most verbose level it will
+ /// enable.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing_subscriber::{
+ /// layer::{Layer, SubscriberExt},
+ /// filter::{DynFilterFn, LevelFilter},
+ /// util::SubscriberInitExt,
+ /// };
+ /// use tracing_core::Level;
+ ///
+ /// // Only enable spans or events with levels at or below `INFO`, if
+ /// // we are inside a span called "interesting_span".
+ /// let my_filter = DynFilterFn::new(|metadata, cx| {
+ /// // If the level is greater than INFO, disable it.
+ /// if metadata.level() > &Level::INFO {
+ /// return false;
+ /// }
+ ///
+ /// // If any span in the current scope is named "interesting_span",
+ /// // enable this span or event.
+ /// for span in cx.lookup_current().iter().flat_map(|span| span.scope()) {
+ /// if span.name() == "interesting_span" {
+ /// return true;
+ /// }
+ /// }
+ ///
+ /// // Otherwise, disable it.
+ /// false
+ /// })
+ /// // Since the filter closure will only enable the `INFO` level and
+ /// // below, set the max level hint
+ /// .with_max_level_hint(LevelFilter::INFO);
+ ///
+ /// let my_layer = tracing_subscriber::fmt::layer();
+ ///
+ /// tracing_subscriber::registry()
+ /// .with(my_layer.with_filter(my_filter))
+ /// .init();
+ /// ```
+ ///
+ /// [`Level`]: tracing_core::Level
+ /// [`Filter::max_level_hint`]: crate::layer::Filter::max_level_hint
+ pub fn with_max_level_hint(self, max_level_hint: impl Into<LevelFilter>) -> Self {
+ Self {
+ max_level_hint: Some(max_level_hint.into()),
+ ..self
+ }
+ }
+
+ /// Adds a function for filtering callsites to this filter.
+ ///
+ /// When this filter's [`Filter::callsite_enabled`][cse] method is called,
+ /// the provided function will be used rather than the default.
+ ///
+ /// By default, `DynFilterFn` assumes that, because the filter _may_ depend
+ /// dynamically on the current [span context], its result should never be
+ /// cached. However, some filtering strategies may require dynamic information
+ /// from the current span context in *some* cases, but are able to make
+ /// static filtering decisions from [`Metadata`] alone in others.
+ ///
+ /// For example, consider the filter given in the example for
+ /// [`DynFilterFn::new`]. That filter enables all spans named
+ /// "interesting_span", and any events and spans that occur inside of an
+ /// interesting span. Since the span's name is part of its static
+ /// [`Metadata`], the "interesting_span" can be enabled in
+ /// [`callsite_enabled`][cse]:
+ ///
+ /// ```
+ /// use tracing_subscriber::{
+ /// layer::{Layer, SubscriberExt},
+ /// filter::DynFilterFn,
+ /// util::SubscriberInitExt,
+ /// };
+ /// use tracing_core::subscriber::Interest;
+ ///
+ /// // Only enable spans or events within a span named "interesting_span".
+ /// let my_filter = DynFilterFn::new(|metadata, cx| {
+ /// // If this *is* "interesting_span", make sure to enable it.
+ /// if metadata.is_span() && metadata.name() == "interesting_span" {
+ /// return true;
+ /// }
+ ///
+ /// // Otherwise, are we in an interesting span?
+ /// if let Some(current_span) = cx.lookup_current() {
+ /// return current_span.name() == "interesting_span";
+ /// }
+ ///
+ /// false
+ /// }).with_callsite_filter(|metadata| {
+ /// // If this is an "interesting_span", we know we will always
+ /// // enable it.
+ /// if metadata.is_span() && metadata.name() == "interesting_span" {
+ /// return Interest::always();
+ /// }
+ ///
+ /// // Otherwise, it depends on whether or not we're in an interesting
+ /// // span. You'll have to ask us again for each span/event!
+ /// Interest::sometimes()
+ /// });
+ ///
+ /// let my_layer = tracing_subscriber::fmt::layer();
+ ///
+ /// tracing_subscriber::registry()
+ /// .with(my_layer.with_filter(my_filter))
+ /// .init();
+ /// ```
+ ///
+ /// [cse]: crate::layer::Filter::callsite_enabled
+ /// [`enabled`]: crate::layer::Filter::enabled
+ /// [`Metadata`]: tracing_core::Metadata
+ /// [span context]: crate::layer::Context
+ pub fn with_callsite_filter<R2>(self, callsite_enabled: R2) -> DynFilterFn<S, F, R2>
+ where
+ R2: Fn(&'static Metadata<'static>) -> Interest,
+ {
+ let register_callsite = Some(callsite_enabled);
+ let DynFilterFn {
+ enabled,
+ max_level_hint,
+ _s,
+ ..
+ } = self;
+ DynFilterFn {
+ enabled,
+ register_callsite,
+ max_level_hint,
+ _s,
+ }
+ }
+
+ fn default_callsite_enabled(&self, metadata: &Metadata<'_>) -> Interest {
+ // If it's below the configured max level, assume that `enabled` will
+ // never enable it...
+ if !is_below_max_level(&self.max_level_hint, metadata) {
+ debug_assert!(
+ !(self.enabled)(metadata, &Context::none()),
+ "DynFilterFn<{}> claimed it would only enable {:?} and below, \
+ but it enabled metadata with the {:?} level\nmetadata={:#?}",
+ type_name::<F>(),
+ self.max_level_hint.unwrap(),
+ metadata.level(),
+ metadata,
+ );
+ return Interest::never();
+ }
+
+ // Otherwise, since this `enabled` function is dynamic and depends on
+ // the current context, we don't know whether this span or event will be
+ // enabled or not. Ask again every time it's recorded!
+ Interest::sometimes()
+ }
+}
+
+impl<S, F, R> DynFilterFn<S, F, R>
+where
+ F: Fn(&Metadata<'_>, &Context<'_, S>) -> bool,
+ R: Fn(&'static Metadata<'static>) -> Interest,
+{
+ #[inline]
+ fn is_enabled(&self, metadata: &Metadata<'_>, cx: &Context<'_, S>) -> bool {
+ let enabled = (self.enabled)(metadata, cx);
+ debug_assert!(
+ !enabled || is_below_max_level(&self.max_level_hint, metadata),
+ "DynFilterFn<{}> claimed it would only enable {:?} and below, \
+ but it enabled metadata with the {:?} level\nmetadata={:#?}",
+ type_name::<F>(),
+ self.max_level_hint.unwrap(),
+ metadata.level(),
+ metadata,
+ );
+
+ enabled
+ }
+
+ #[inline]
+ fn is_callsite_enabled(&self, metadata: &'static Metadata<'static>) -> Interest {
+ let interest = self
+ .register_callsite
+ .as_ref()
+ .map(|callsite_enabled| callsite_enabled(metadata))
+ .unwrap_or_else(|| self.default_callsite_enabled(metadata));
+ debug_assert!(
+ interest.is_never() || is_below_max_level(&self.max_level_hint, metadata),
+ "DynFilterFn<{}, {}> claimed it was only interested in {:?} and below, \
+ but it enabled metadata with the {:?} level\nmetadata={:#?}",
+ type_name::<F>(),
+ type_name::<R>(),
+ self.max_level_hint.unwrap(),
+ metadata.level(),
+ metadata,
+ );
+
+ interest
+ }
+}
+
+impl<S, F, R> Layer<S> for DynFilterFn<S, F, R>
+where
+ F: Fn(&Metadata<'_>, &Context<'_, S>) -> bool + 'static,
+ R: Fn(&'static Metadata<'static>) -> Interest + 'static,
+ S: Subscriber,
+{
+ fn enabled(&self, metadata: &Metadata<'_>, cx: Context<'_, S>) -> bool {
+ self.is_enabled(metadata, &cx)
+ }
+
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ self.is_callsite_enabled(metadata)
+ }
+
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ self.max_level_hint
+ }
+}
+
+impl<S, F, R> fmt::Debug for DynFilterFn<S, F, R> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let mut s = f.debug_struct("DynFilterFn");
+ s.field("enabled", &format_args!("{}", type_name::<F>()));
+ if self.register_callsite.is_some() {
+ s.field(
+ "register_callsite",
+ &format_args!("Some({})", type_name::<R>()),
+ );
+ } else {
+ s.field("register_callsite", &format_args!("None"));
+ }
+
+ s.field("max_level_hint", &self.max_level_hint).finish()
+ }
+}
+
+impl<S, F, R> Clone for DynFilterFn<S, F, R>
+where
+ F: Clone,
+ R: Clone,
+{
+ fn clone(&self) -> Self {
+ Self {
+ enabled: self.enabled.clone(),
+ register_callsite: self.register_callsite.clone(),
+ max_level_hint: self.max_level_hint,
+ _s: PhantomData,
+ }
+ }
+}
+
+impl<F, S> From<F> for DynFilterFn<S, F>
+where
+ F: Fn(&Metadata<'_>, &Context<'_, S>) -> bool,
+{
+ fn from(f: F) -> Self {
+ Self::new(f)
+ }
+}
+
+// === PLF impls ===
+
+feature! {
+ #![all(feature = "registry", feature = "std")]
+ use crate::layer::Filter;
+
+ impl<S, F> Filter<S> for FilterFn<F>
+ where
+ F: Fn(&Metadata<'_>) -> bool,
+ {
+ fn enabled(&self, metadata: &Metadata<'_>, _: &Context<'_, S>) -> bool {
+ self.is_enabled(metadata)
+ }
+
+ fn callsite_enabled(&self, metadata: &'static Metadata<'static>) -> Interest {
+ self.is_callsite_enabled(metadata)
+ }
+
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ self.max_level_hint
+ }
+ }
+
+ impl<S, F, R> Filter<S> for DynFilterFn<S, F, R>
+ where
+ F: Fn(&Metadata<'_>, &Context<'_, S>) -> bool,
+ R: Fn(&'static Metadata<'static>) -> Interest,
+ {
+ fn enabled(&self, metadata: &Metadata<'_>, cx: &Context<'_, S>) -> bool {
+ self.is_enabled(metadata, cx)
+ }
+
+ fn callsite_enabled(&self, metadata: &'static Metadata<'static>) -> Interest {
+ self.is_callsite_enabled(metadata)
+ }
+
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ self.max_level_hint
+ }
+ }
+}
+
+fn is_below_max_level(hint: &Option<LevelFilter>, metadata: &Metadata<'_>) -> bool {
+ hint.as_ref()
+ .map(|hint| metadata.level() <= hint)
+ .unwrap_or(true)
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/filter/layer_filters.rs b/vendor/tracing-subscriber-0.3.3/src/filter/layer_filters.rs
new file mode 100644
index 000000000..e77fd3751
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/filter/layer_filters.rs
@@ -0,0 +1,830 @@
+//! ## Per-Layer Filtering
+//!
+//! Per-layer filters permit individual `Layer`s to have their own filter
+//! configurations without interfering with other `Layer`s.
+//!
+//! This module is not public; the public APIs defined in this module are
+//! re-exported in the top-level `filter` module. Therefore, this documentation
+//! primarily concerns the internal implementation details. For the user-facing
+//! public API documentation, see the individual public types in this module, as
+//! well as the, see the `Layer` trait documentation's [per-layer filtering
+//! section]][1].
+//!
+//! ## How does per-layer filtering work?
+//!
+//! As described in the API documentation, the [`Filter`] trait defines a
+//! filtering strategy for a per-layer filter. We expect there will be a variety
+//! of implementations of [`Filter`], both in `tracing-subscriber` and in user
+//! code.
+//!
+//! To actually *use* a [`Filter`] implementation, it is combined with a
+//! [`Layer`] by the [`Filtered`] struct defined in this module. [`Filtered`]
+//! implements [`Layer`] by calling into the wrapped [`Layer`], or not, based on
+//! the filtering strategy. While there will be a variety of types that implement
+//! [`Filter`], all actual *uses* of per-layer filtering will occur through the
+//! [`Filtered`] struct. Therefore, most of the implementation details live
+//! there.
+//!
+//! [1]: crate::layer#per-layer-filtering
+//! [`Filter`]: crate::layer::Filter
+use crate::{
+ filter::LevelFilter,
+ layer::{self, Context, Layer},
+ registry,
+};
+use std::{
+ any::TypeId,
+ cell::{Cell, RefCell},
+ fmt,
+ marker::PhantomData,
+ sync::Arc,
+ thread_local,
+};
+use tracing_core::{
+ span,
+ subscriber::{Interest, Subscriber},
+ Event, Metadata,
+};
+
+/// A [`Layer`] that wraps an inner [`Layer`] and adds a [`Filter`] which
+/// controls what spans and events are enabled for that layer.
+///
+/// This is returned by the [`Layer::with_filter`] method. See the
+/// [documentation on per-layer filtering][plf] for details.
+///
+/// [`Filter`]: crate::layer::Filter
+/// [plf]: crate::layer#per-layer-filtering
+#[cfg_attr(docsrs, doc(cfg(feature = "registry")))]
+#[derive(Clone)]
+pub struct Filtered<L, F, S> {
+ filter: F,
+ layer: L,
+ id: MagicPlfDowncastMarker,
+ _s: PhantomData<fn(S)>,
+}
+
+/// Uniquely identifies an individual [`Filter`] instance in the context of
+/// a [`Subscriber`].
+///
+/// When adding a [`Filtered`] [`Layer`] to a [`Subscriber`], the [`Subscriber`]
+/// generates a `FilterId` for that [`Filtered`] layer. The [`Filtered`] layer
+/// will then use the generated ID to query whether a particular span was
+/// previously enabled by that layer's [`Filter`].
+///
+/// **Note**: Currently, the [`Registry`] type provided by this crate is the
+/// **only** [`Subscriber`] implementation capable of participating in per-layer
+/// filtering. Therefore, the `FilterId` type cannot currently be constructed by
+/// code outside of `tracing-subscriber`. In the future, new APIs will be added to `tracing-subscriber` to
+/// allow non-Registry [`Subscriber`]s to also participate in per-layer
+/// filtering. When those APIs are added, subscribers will be responsible
+/// for generating and assigning `FilterId`s.
+///
+/// [`Filter`]: crate::layer::Filter
+/// [`Subscriber`]: tracing_core::Subscriber
+/// [`Layer`]: crate::layer::Layer
+/// [`Registry`]: crate::registry::Registry
+#[cfg(feature = "registry")]
+#[cfg_attr(docsrs, doc(cfg(feature = "registry")))]
+#[derive(Copy, Clone)]
+pub struct FilterId(u64);
+
+/// A bitmap tracking which [`FilterId`]s have enabled a given span or
+/// event.
+///
+/// This is currently a private type that's used exclusively by the
+/// [`Registry`]. However, in the future, this may become a public API, in order
+/// to allow user subscribers to host [`Filter`]s.
+///
+/// [`Registry`]: crate::Registry
+/// [`Filter`]: crate::layer::Filter
+#[derive(Default, Copy, Clone, Eq, PartialEq)]
+pub(crate) struct FilterMap {
+ bits: u64,
+}
+
+/// The current state of `enabled` calls to per-layer filters on this
+/// thread.
+///
+/// When `Filtered::enabled` is called, the filter will set the bit
+/// corresponding to its ID if the filter will disable the event/span being
+/// filtered. When the event or span is recorded, the per-layer filter will
+/// check its bit to determine if it disabled that event or span, and skip
+/// forwarding the event or span to the inner layer if the bit is set. Once
+/// a span or event has been skipped by a per-layer filter, it unsets its
+/// bit, so that the `FilterMap` has been cleared for the next set of
+/// `enabled` calls.
+///
+/// FilterState is also read by the `Registry`, for two reasons:
+///
+/// 1. When filtering a span, the Registry must store the `FilterMap`
+/// generated by `Filtered::enabled` calls for that span as part of the
+/// span's per-span data. This allows `Filtered` layers to determine
+/// whether they had previously disabled a given span, and avoid showing it
+/// to the wrapped layer if it was disabled.
+///
+/// This allows `Filtered` layers to also filter out the spans they
+/// disable from span traversals (such as iterating over parents, etc).
+/// 2. If all the bits are set, then every per-layer filter has decided it
+/// doesn't want to enable that span or event. In that case, the
+/// `Registry`'s `enabled` method will return `false`, so that
+/// recording a span or event can be skipped entirely.
+#[derive(Debug)]
+pub(crate) struct FilterState {
+ enabled: Cell<FilterMap>,
+ // TODO(eliza): `Interest`s should _probably_ be `Copy`. The only reason
+ // they're not is our Obsessive Commitment to Forwards-Compatibility. If
+ // this changes in tracing-core`, we can make this a `Cell` rather than
+ // `RefCell`...
+ interest: RefCell<Option<Interest>>,
+
+ #[cfg(debug_assertions)]
+ counters: DebugCounters,
+}
+
+/// Extra counters added to `FilterState` used only to make debug assertions.
+#[cfg(debug_assertions)]
+#[derive(Debug, Default)]
+struct DebugCounters {
+ /// How many per-layer filters have participated in the current `enabled`
+ /// call?
+ in_filter_pass: Cell<usize>,
+
+ /// How many per-layer filters have participated in the current `register_callsite`
+ /// call?
+ in_interest_pass: Cell<usize>,
+}
+
+thread_local! {
+ pub(crate) static FILTERING: FilterState = FilterState::new();
+}
+
+// === impl Filter ===
+#[cfg(feature = "registry")]
+#[cfg_attr(docsrs, doc(cfg(feature = "registry")))]
+impl<S> layer::Filter<S> for LevelFilter {
+ fn enabled(&self, meta: &Metadata<'_>, _: &Context<'_, S>) -> bool {
+ meta.level() <= self
+ }
+
+ fn callsite_enabled(&self, meta: &'static Metadata<'static>) -> Interest {
+ if meta.level() <= self {
+ Interest::always()
+ } else {
+ Interest::never()
+ }
+ }
+
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ Some(*self)
+ }
+}
+
+impl<S> layer::Filter<S> for Arc<dyn layer::Filter<S> + Send + Sync + 'static> {
+ #[inline]
+ fn enabled(&self, meta: &Metadata<'_>, cx: &Context<'_, S>) -> bool {
+ (**self).enabled(meta, cx)
+ }
+
+ #[inline]
+ fn callsite_enabled(&self, meta: &'static Metadata<'static>) -> Interest {
+ (**self).callsite_enabled(meta)
+ }
+
+ #[inline]
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ (**self).max_level_hint()
+ }
+}
+
+impl<S> layer::Filter<S> for Box<dyn layer::Filter<S> + Send + Sync + 'static> {
+ #[inline]
+ fn enabled(&self, meta: &Metadata<'_>, cx: &Context<'_, S>) -> bool {
+ (**self).enabled(meta, cx)
+ }
+
+ #[inline]
+ fn callsite_enabled(&self, meta: &'static Metadata<'static>) -> Interest {
+ (**self).callsite_enabled(meta)
+ }
+
+ #[inline]
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ (**self).max_level_hint()
+ }
+}
+
+// === impl Filtered ===
+
+impl<L, F, S> Filtered<L, F, S> {
+ /// Wraps the provided [`Layer`] so that it is filtered by the given
+ /// [`Filter`].
+ ///
+ /// This is equivalent to calling the [`Layer::with_filter`] method.
+ ///
+ /// See the [documentation on per-layer filtering][plf] for details.
+ ///
+ /// [`Filter`]: crate::layer::Filter
+ /// [plf]: crate::layer#per-layer-filtering
+ pub fn new(layer: L, filter: F) -> Self {
+ Self {
+ layer,
+ filter,
+ id: MagicPlfDowncastMarker(FilterId::disabled()),
+ _s: PhantomData,
+ }
+ }
+
+ #[inline(always)]
+ fn id(&self) -> FilterId {
+ debug_assert!(
+ !self.id.0.is_disabled(),
+ "a `Filtered` layer was used, but it had no `FilterId`; \
+ was it registered with the subscriber?"
+ );
+ self.id.0
+ }
+
+ fn did_enable(&self, f: impl FnOnce()) {
+ FILTERING.with(|filtering| filtering.did_enable(self.id(), f))
+ }
+}
+
+impl<S, L, F> Layer<S> for Filtered<L, F, S>
+where
+ S: Subscriber + for<'span> registry::LookupSpan<'span> + 'static,
+ F: layer::Filter<S> + 'static,
+ L: Layer<S>,
+{
+ fn on_layer(&mut self, subscriber: &mut S) {
+ self.id = MagicPlfDowncastMarker(subscriber.register_filter());
+ self.layer.on_layer(subscriber);
+ }
+
+ // TODO(eliza): can we figure out a nice way to make the `Filtered` layer
+ // not call `is_enabled_for` in hooks that the inner layer doesn't actually
+ // have real implementations of? probably not...
+ //
+ // it would be cool if there was some wild rust reflection way of checking
+ // if a trait impl has the default impl of a trait method or not, but that's
+ // almsot certainly impossible...right?
+
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ let interest = self.filter.callsite_enabled(metadata);
+
+ // If the filter didn't disable the callsite, allow the inner layer to
+ // register it — since `register_callsite` is also used for purposes
+ // such as reserving/caching per-callsite data, we want the inner layer
+ // to be able to perform any other registration steps. However, we'll
+ // ignore its `Interest`.
+ if !interest.is_never() {
+ self.layer.register_callsite(metadata);
+ }
+
+ // Add our `Interest` to the current sum of per-layer filter `Interest`s
+ // for this callsite.
+ FILTERING.with(|filtering| filtering.add_interest(interest));
+
+ // don't short circuit! if the stack consists entirely of `Layer`s with
+ // per-layer filters, the `Registry` will return the actual `Interest`
+ // value that's the sum of all the `register_callsite` calls to those
+ // per-layer filters. if we returned an actual `never` interest here, a
+ // `Layered` layer would short-circuit and not allow any `Filtered`
+ // layers below us if _they_ are interested in the callsite.
+ Interest::always()
+ }
+
+ fn enabled(&self, metadata: &Metadata<'_>, cx: Context<'_, S>) -> bool {
+ let cx = cx.with_filter(self.id());
+ let enabled = self.filter.enabled(metadata, &cx);
+ FILTERING.with(|filtering| filtering.set(self.id(), enabled));
+
+ if enabled {
+ // If the filter enabled this metadata, ask the wrapped layer if
+ // _it_ wants it --- it might have a global filter.
+ self.layer.enabled(metadata, cx)
+ } else {
+ // Otherwise, return `true`. The _per-layer_ filter disabled this
+ // metadata, but returning `false` in `Layer::enabled` will
+ // short-circuit and globally disable the span or event. This is
+ // *not* what we want for per-layer filters, as other layers may
+ // still want this event. Returning `true` here means we'll continue
+ // asking the next layer in the stack.
+ //
+ // Once all per-layer filters have been evaluated, the `Registry`
+ // at the root of the stack will return `false` from its `enabled`
+ // method if *every* per-layer filter disabled this metadata.
+ // Otherwise, the individual per-layer filters will skip the next
+ // `new_span` or `on_event` call for their layer if *they* disabled
+ // the span or event, but it was not globally disabled.
+ true
+ }
+ }
+
+ fn on_new_span(&self, attrs: &span::Attributes<'_>, id: &span::Id, cx: Context<'_, S>) {
+ self.did_enable(|| {
+ self.layer.on_new_span(attrs, id, cx.with_filter(self.id()));
+ })
+ }
+
+ #[doc(hidden)]
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ self.filter.max_level_hint()
+ }
+
+ fn on_record(&self, span: &span::Id, values: &span::Record<'_>, cx: Context<'_, S>) {
+ if let Some(cx) = cx.if_enabled_for(span, self.id()) {
+ self.layer.on_record(span, values, cx)
+ }
+ }
+
+ fn on_follows_from(&self, span: &span::Id, follows: &span::Id, cx: Context<'_, S>) {
+ // only call `on_follows_from` if both spans are enabled by us
+ if cx.is_enabled_for(span, self.id()) && cx.is_enabled_for(follows, self.id()) {
+ self.layer
+ .on_follows_from(span, follows, cx.with_filter(self.id()))
+ }
+ }
+
+ fn on_event(&self, event: &Event<'_>, cx: Context<'_, S>) {
+ self.did_enable(|| {
+ self.layer.on_event(event, cx.with_filter(self.id()));
+ })
+ }
+
+ fn on_enter(&self, id: &span::Id, cx: Context<'_, S>) {
+ if let Some(cx) = cx.if_enabled_for(id, self.id()) {
+ self.layer.on_enter(id, cx)
+ }
+ }
+
+ fn on_exit(&self, id: &span::Id, cx: Context<'_, S>) {
+ if let Some(cx) = cx.if_enabled_for(id, self.id()) {
+ self.layer.on_exit(id, cx)
+ }
+ }
+
+ fn on_close(&self, id: span::Id, cx: Context<'_, S>) {
+ if let Some(cx) = cx.if_enabled_for(&id, self.id()) {
+ self.layer.on_close(id, cx)
+ }
+ }
+
+ // XXX(eliza): the existence of this method still makes me sad...
+ fn on_id_change(&self, old: &span::Id, new: &span::Id, cx: Context<'_, S>) {
+ if let Some(cx) = cx.if_enabled_for(old, self.id()) {
+ self.layer.on_id_change(old, new, cx)
+ }
+ }
+
+ #[doc(hidden)]
+ #[inline]
+ unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()> {
+ match id {
+ id if id == TypeId::of::<Self>() => Some(self as *const _ as *const ()),
+ id if id == TypeId::of::<L>() => Some(&self.layer as *const _ as *const ()),
+ id if id == TypeId::of::<F>() => Some(&self.filter as *const _ as *const ()),
+ id if id == TypeId::of::<MagicPlfDowncastMarker>() => {
+ Some(&self.id as *const _ as *const ())
+ }
+ _ => self.layer.downcast_raw(id),
+ }
+ }
+}
+
+impl<F, L, S> fmt::Debug for Filtered<F, L, S>
+where
+ F: fmt::Debug,
+ L: fmt::Debug,
+{
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Filtered")
+ .field("filter", &self.filter)
+ .field("layer", &self.layer)
+ .field("id", &self.id)
+ .finish()
+ }
+}
+
+// === impl FilterId ===
+
+impl FilterId {
+ const fn disabled() -> Self {
+ Self(std::u64::MAX)
+ }
+
+ /// Returns a `FilterId` that will consider _all_ spans enabled.
+ pub(crate) const fn none() -> Self {
+ Self(0)
+ }
+
+ pub(crate) fn new(id: u8) -> Self {
+ assert!(id < 64, "filter IDs may not be greater than 64");
+ Self(1 << id as usize)
+ }
+
+ /// Combines two `FilterId`s, returning a new `FilterId` that will match a
+ /// [`FilterMap`] where the span was disabled by _either_ this `FilterId`
+ /// *or* the combined `FilterId`.
+ ///
+ /// This method is called by [`Context`]s when adding the `FilterId` of a
+ /// [`Filtered`] layer to the context.
+ ///
+ /// This is necessary for cases where we have a tree of nested [`Filtered`]
+ /// layers, like this:
+ ///
+ /// ```text
+ /// Filtered {
+ /// filter1,
+ /// Layered {
+ /// layer1,
+ /// Filtered {
+ /// filter2,
+ /// layer2,
+ /// },
+ /// }
+ /// ```
+ ///
+ /// We want `layer2` to be affected by both `filter1` _and_ `filter2`.
+ /// Without combining `FilterId`s, this works fine when filtering
+ /// `on_event`/`new_span`, because the outer `Filtered` layer (`filter1`)
+ /// won't call the inner layer's `on_event` or `new_span` callbacks if it
+ /// disabled the event/span.
+ ///
+ /// However, it _doesn't_ work when filtering span lookups and traversals
+ /// (e.g. `scope`). This is because the [`Context`] passed to `layer2`
+ /// would set its filter ID to the filter ID of `filter2`, and would skip
+ /// spans that were disabled by `filter2`. However, what if a span was
+ /// disabled by `filter1`? We wouldn't see it in `new_span`, but we _would_
+ /// see it in lookups and traversals...which we don't want.
+ ///
+ /// When a [`Filtered`] layer adds its ID to a [`Context`], it _combines_ it
+ /// with any previous filter ID that the context had, rather than replacing
+ /// it. That way, `layer2`'s context will check if a span was disabled by
+ /// `filter1` _or_ `filter2`. The way we do this, instead of representing
+ /// `FilterId`s as a number number that we shift a 1 over by to get a mask,
+ /// we just store the actual mask,so we can combine them with a bitwise-OR.
+ ///
+ /// For example, if we consider the following case (pretending that the
+ /// masks are 8 bits instead of 64 just so i don't have to write out a bunch
+ /// of extra zeroes):
+ ///
+ /// - `filter1` has the filter id 1 (`0b0000_0001`)
+ /// - `filter2` has the filter id 2 (`0b0000_0010`)
+ ///
+ /// A span that gets disabled by filter 1 would have the [`FilterMap`] with
+ /// bits `0b0000_0001`.
+ ///
+ /// If the `FilterId` was internally represented as `(bits to shift + 1),
+ /// when `layer2`'s [`Context`] checked if it enabled the span, it would
+ /// make the mask `0b0000_0010` (`1 << 1`). That bit would not be set in the
+ /// [`FilterMap`], so it would see that it _didn't_ disable the span. Which
+ /// is *true*, it just doesn't reflect the tree-like shape of the actual
+ /// subscriber.
+ ///
+ /// By having the IDs be masks instead of shifts, though, when the
+ /// [`Filtered`] with `filter2` gets the [`Context`] with `filter1`'s filter ID,
+ /// instead of replacing it, it ors them together:
+ ///
+ /// ```ignore
+ /// 0b0000_0001 | 0b0000_0010 == 0b0000_0011;
+ /// ```
+ ///
+ /// We then test if the span was disabled by seeing if _any_ bits in the
+ /// mask are `1`:
+ ///
+ /// ```ignore
+ /// filtermap & mask != 0;
+ /// 0b0000_0001 & 0b0000_0011 != 0;
+ /// 0b0000_0001 != 0;
+ /// true;
+ /// ```
+ ///
+ /// [`Context`]: crate::layer::Context
+ pub(crate) fn and(self, FilterId(other): Self) -> Self {
+ // If this mask is disabled, just return the other --- otherwise, we
+ // would always see that every span is disabled.
+ if self.0 == Self::disabled().0 {
+ return Self(other);
+ }
+
+ Self(self.0 | other)
+ }
+
+ fn is_disabled(self) -> bool {
+ self.0 == Self::disabled().0
+ }
+}
+
+impl fmt::Debug for FilterId {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ // don't print a giant set of the numbers 0..63 if the filter ID is disabled.
+ if self.0 == Self::disabled().0 {
+ return f
+ .debug_tuple("FilterId")
+ .field(&format_args!("DISABLED"))
+ .finish();
+ }
+
+ if f.alternate() {
+ f.debug_struct("FilterId")
+ .field("ids", &format_args!("{:?}", FmtBitset(self.0)))
+ .field("bits", &format_args!("{:b}", self.0))
+ .finish()
+ } else {
+ f.debug_tuple("FilterId").field(&FmtBitset(self.0)).finish()
+ }
+ }
+}
+
+impl fmt::Binary for FilterId {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_tuple("FilterId")
+ .field(&format_args!("{:b}", self.0))
+ .finish()
+ }
+}
+
+// === impl FilterMap ===
+
+impl FilterMap {
+ pub(crate) fn set(self, FilterId(mask): FilterId, enabled: bool) -> Self {
+ if mask == std::u64::MAX {
+ return self;
+ }
+
+ if enabled {
+ Self {
+ bits: self.bits & (!mask),
+ }
+ } else {
+ Self {
+ bits: self.bits | mask,
+ }
+ }
+ }
+
+ #[inline]
+ pub(crate) fn is_enabled(self, FilterId(mask): FilterId) -> bool {
+ self.bits & mask == 0
+ }
+
+ #[inline]
+ pub(crate) fn any_enabled(self) -> bool {
+ self.bits != std::u64::MAX
+ }
+}
+
+impl fmt::Debug for FilterMap {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let alt = f.alternate();
+ let mut s = f.debug_struct("FilterMap");
+ s.field("disabled_by", &format_args!("{:?}", &FmtBitset(self.bits)));
+
+ if alt {
+ s.field("bits", &format_args!("{:b}", self.bits));
+ }
+
+ s.finish()
+ }
+}
+
+impl fmt::Binary for FilterMap {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("FilterMap")
+ .field("bits", &format_args!("{:b}", self.bits))
+ .finish()
+ }
+}
+
+// === impl FilterState ===
+
+impl FilterState {
+ fn new() -> Self {
+ Self {
+ enabled: Cell::new(FilterMap::default()),
+ interest: RefCell::new(None),
+
+ #[cfg(debug_assertions)]
+ counters: DebugCounters::default(),
+ }
+ }
+
+ fn set(&self, filter: FilterId, enabled: bool) {
+ #[cfg(debug_assertions)]
+ {
+ let in_current_pass = self.counters.in_filter_pass.get();
+ if in_current_pass == 0 {
+ debug_assert_eq!(self.enabled.get(), FilterMap::default());
+ }
+ self.counters.in_filter_pass.set(in_current_pass + 1);
+ debug_assert_eq!(
+ self.counters.in_interest_pass.get(),
+ 0,
+ "if we are in or starting a filter pass, we must not be in an interest pass."
+ )
+ }
+
+ self.enabled.set(self.enabled.get().set(filter, enabled))
+ }
+
+ fn add_interest(&self, interest: Interest) {
+ let mut curr_interest = self.interest.borrow_mut();
+
+ #[cfg(debug_assertions)]
+ {
+ let in_current_pass = self.counters.in_interest_pass.get();
+ if in_current_pass == 0 {
+ debug_assert!(curr_interest.is_none());
+ }
+ self.counters.in_interest_pass.set(in_current_pass + 1);
+ }
+
+ if let Some(curr_interest) = curr_interest.as_mut() {
+ if (curr_interest.is_always() && !interest.is_always())
+ || (curr_interest.is_never() && !interest.is_never())
+ {
+ *curr_interest = Interest::sometimes();
+ }
+ // If the two interests are the same, do nothing. If the current
+ // interest is `sometimes`, stay sometimes.
+ } else {
+ *curr_interest = Some(interest);
+ }
+ }
+
+ pub(crate) fn event_enabled() -> bool {
+ FILTERING
+ .try_with(|this| {
+ let enabled = this.enabled.get().any_enabled();
+ #[cfg(debug_assertions)]
+ {
+ if this.counters.in_filter_pass.get() == 0 {
+ debug_assert_eq!(this.enabled.get(), FilterMap::default());
+ }
+
+ // Nothing enabled this event, we won't tick back down the
+ // counter in `did_enable`. Reset it.
+ if !enabled {
+ this.counters.in_filter_pass.set(0);
+ }
+ }
+ enabled
+ })
+ .unwrap_or(true)
+ }
+
+ /// Executes a closure if the filter with the provided ID did not disable
+ /// the current span/event.
+ ///
+ /// This is used to implement the `on_event` and `new_span` methods for
+ /// `Filtered`.
+ fn did_enable(&self, filter: FilterId, f: impl FnOnce()) {
+ let map = self.enabled.get();
+ if map.is_enabled(filter) {
+ // If the filter didn't disable the current span/event, run the
+ // callback.
+ f();
+ } else {
+ // Otherwise, if this filter _did_ disable the span or event
+ // currently being processed, clear its bit from this thread's
+ // `FilterState`. The bit has already been "consumed" by skipping
+ // this callback, and we need to ensure that the `FilterMap` for
+ // this thread is reset when the *next* `enabled` call occurs.
+ self.enabled.set(map.set(filter, true));
+ }
+ #[cfg(debug_assertions)]
+ {
+ let in_current_pass = self.counters.in_filter_pass.get();
+ if in_current_pass <= 1 {
+ debug_assert_eq!(self.enabled.get(), FilterMap::default());
+ }
+ self.counters
+ .in_filter_pass
+ .set(in_current_pass.saturating_sub(1));
+ debug_assert_eq!(
+ self.counters.in_interest_pass.get(),
+ 0,
+ "if we are in a filter pass, we must not be in an interest pass."
+ )
+ }
+ }
+
+ /// Clears the current in-progress filter state.
+ ///
+ /// This resets the [`FilterMap`] and current [`Interest`] as well as
+ /// clearing the debug counters.
+ pub(crate) fn clear_enabled() {
+ // Drop the `Result` returned by `try_with` --- if we are in the middle
+ // a panic and the thread-local has been torn down, that's fine, just
+ // ignore it ratehr than panicking.
+ let _ = FILTERING.try_with(|filtering| {
+ filtering.enabled.set(FilterMap::default());
+
+ #[cfg(debug_assertions)]
+ filtering.counters.in_filter_pass.set(0);
+ });
+ }
+
+ pub(crate) fn take_interest() -> Option<Interest> {
+ FILTERING
+ .try_with(|filtering| {
+ #[cfg(debug_assertions)]
+ {
+ if filtering.counters.in_interest_pass.get() == 0 {
+ debug_assert!(filtering.interest.try_borrow().ok()?.is_none());
+ }
+ filtering.counters.in_interest_pass.set(0);
+ }
+ filtering.interest.try_borrow_mut().ok()?.take()
+ })
+ .ok()?
+ }
+
+ pub(crate) fn filter_map(&self) -> FilterMap {
+ let map = self.enabled.get();
+ #[cfg(debug_assertions)]
+ {
+ if self.counters.in_filter_pass.get() == 0 {
+ debug_assert_eq!(map, FilterMap::default());
+ }
+ }
+
+ map
+ }
+}
+/// This is a horrible and bad abuse of the downcasting system to expose
+/// *internally* whether a layer has per-layer filtering, within
+/// `tracing-subscriber`, without exposing a public API for it.
+///
+/// If a `Layer` has per-layer filtering, it will downcast to a
+/// `MagicPlfDowncastMarker`. Since layers which contain other layers permit
+/// downcasting to recurse to their children, this will do the Right Thing with
+/// layers like Reload, Option, etc.
+///
+/// Why is this a wrapper around the `FilterId`, you may ask? Because
+/// downcasting works by returning a pointer, and we don't want to risk
+/// introducing UB by constructing pointers that _don't_ point to a valid
+/// instance of the type they claim to be. In this case, we don't _intend_ for
+/// this pointer to be dereferenced, so it would actually be fine to return one
+/// that isn't a valid pointer...but we can't guarantee that the caller won't
+/// (accidentally) dereference it, so it's better to be safe than sorry. We
+/// could, alternatively, add an additional field to the type that's used only
+/// for returning pointers to as as part of the evil downcasting hack, but I
+/// thought it was nicer to just add a `repr(transparent)` wrapper to the
+/// existing `FilterId` field, since it won't make the struct any bigger.
+///
+/// Don't worry, this isn't on the test. :)
+#[derive(Clone, Copy)]
+#[repr(transparent)]
+struct MagicPlfDowncastMarker(FilterId);
+impl fmt::Debug for MagicPlfDowncastMarker {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ // Just pretend that `MagicPlfDowncastMarker` doesn't exist for
+ // `fmt::Debug` purposes...if no one *sees* it in their `Debug` output,
+ // they don't have to know I thought this code would be a good idea.
+ fmt::Debug::fmt(&self.0, f)
+ }
+}
+
+pub(crate) fn is_plf_downcast_marker(type_id: TypeId) -> bool {
+ type_id == TypeId::of::<MagicPlfDowncastMarker>()
+}
+
+/// Does a type implementing `Subscriber` contain any per-layer filters?
+pub(crate) fn subscriber_has_plf<S>(subscriber: &S) -> bool
+where
+ S: Subscriber,
+{
+ (subscriber as &dyn Subscriber).is::<MagicPlfDowncastMarker>()
+}
+
+/// Does a type implementing `Layer` contain any per-layer filters?
+pub(crate) fn layer_has_plf<L, S>(layer: &L) -> bool
+where
+ L: Layer<S>,
+ S: Subscriber,
+{
+ unsafe {
+ // Safety: we're not actually *doing* anything with this pointer --- we
+ // only care about the `Option`, which we're turning into a `bool`. So
+ // even if the layer decides to be evil and give us some kind of invalid
+ // pointer, we don't ever dereference it, so this is always safe.
+ layer.downcast_raw(TypeId::of::<MagicPlfDowncastMarker>())
+ }
+ .is_some()
+}
+
+struct FmtBitset(u64);
+
+impl fmt::Debug for FmtBitset {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let mut set = f.debug_set();
+ for bit in 0..64 {
+ // if the `bit`-th bit is set, add it to the debug set
+ if self.0 & (1 << bit) != 0 {
+ set.entry(&bit);
+ }
+ }
+ set.finish()
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/filter/level.rs b/vendor/tracing-subscriber-0.3.3/src/filter/level.rs
new file mode 100644
index 000000000..0fa601260
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/filter/level.rs
@@ -0,0 +1,27 @@
+use tracing_core::{
+ subscriber::{Interest, Subscriber},
+ Metadata,
+};
+
+#[allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411
+pub use tracing_core::metadata::{LevelFilter, ParseLevelFilterError as ParseError};
+
+// === impl LevelFilter ===
+
+impl<S: Subscriber> crate::Layer<S> for LevelFilter {
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ if self >= metadata.level() {
+ Interest::always()
+ } else {
+ Interest::never()
+ }
+ }
+
+ fn enabled(&self, metadata: &Metadata<'_>, _: crate::layer::Context<'_, S>) -> bool {
+ self >= metadata.level()
+ }
+
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ Some(*self)
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/filter/mod.rs b/vendor/tracing-subscriber-0.3.3/src/filter/mod.rs
new file mode 100644
index 000000000..000a27195
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/filter/mod.rs
@@ -0,0 +1,66 @@
+//! [`Layer`]s that control which spans and events are enabled by the wrapped
+//! subscriber.
+//!
+//! This module contains a number of types that provide implementations of
+//! various strategies for filtering which spans and events are enabled. For
+//! details on filtering spans and events using [`Layer`]s, see the
+//! [`layer` module's documentation].
+//!
+//! [`layer` module's documentation]: crate::layer#filtering-with-layers
+//! [`Layer`]: crate::layer
+mod filter_fn;
+
+feature! {
+ #![all(feature = "env-filter", feature = "std")]
+ mod env;
+ pub use self::env::*;
+}
+
+feature! {
+ #![all(feature = "registry", feature = "std")]
+ mod layer_filters;
+ pub use self::layer_filters::*;
+}
+
+mod level;
+
+pub use self::filter_fn::*;
+pub use self::level::{LevelFilter, ParseError as LevelParseError};
+
+#[cfg(not(all(feature = "registry", feature = "std")))]
+pub(crate) use self::has_plf_stubs::*;
+
+feature! {
+ #![any(feature = "std", feature = "alloc")]
+ pub mod targets;
+ pub use self::targets::Targets;
+
+ mod directive;
+ pub use self::directive::ParseError;
+}
+
+/// Stub implementations of the per-layer-fitler detection functions for when the
+/// `registry` feature is disabled.
+#[cfg(not(all(feature = "registry", feature = "std")))]
+mod has_plf_stubs {
+ pub(crate) fn is_plf_downcast_marker(_: core::any::TypeId) -> bool {
+ false
+ }
+
+ /// Does a type implementing `Subscriber` contain any per-layer filters?
+ pub(crate) fn subscriber_has_plf<S>(_: &S) -> bool
+ where
+ S: tracing_core::Subscriber,
+ {
+ false
+ }
+
+ /// Does a type implementing `Layer` contain any per-layer filters?
+ pub(crate) fn layer_has_plf<L, S>(_: &L) -> bool
+ where
+ L: crate::Layer<S>,
+ S: tracing_core::Subscriber,
+ {
+ false
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/filter/targets.rs b/vendor/tracing-subscriber-0.3.3/src/filter/targets.rs
new file mode 100644
index 000000000..e0c7fcf82
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/filter/targets.rs
@@ -0,0 +1,681 @@
+//! A [filter] that enables or disables spans and events based on their [target] and [level].
+//!
+//! See [`Targets`] for details.
+//!
+//! [target]: tracing_core::Metadata::target
+//! [level]: tracing_core::Level
+//! [filter]: crate::layer#filtering-with-layers
+
+use crate::{
+ filter::{
+ directive::{DirectiveSet, ParseError, StaticDirective},
+ LevelFilter,
+ },
+ layer,
+};
+#[cfg(not(feature = "std"))]
+use alloc::string::String;
+use core::{
+ iter::{Extend, FilterMap, FromIterator},
+ slice,
+ str::FromStr,
+};
+use tracing_core::{Interest, Metadata, Subscriber};
+
+/// A filter that enables or disables spans and events based on their [target]
+/// and [level].
+///
+/// Targets are typically equal to the Rust module path of the code where the
+/// span or event was recorded, although they may be overridden.
+///
+/// This type can be used for both [per-layer filtering][plf] (using its
+/// [`Filter`] implementation) and [global filtering][global] (using its
+/// [`Layer`] implementation).
+///
+/// See the [documentation on filtering with layers][filtering] for details.
+///
+/// # Filtering With `Targets`
+///
+/// A `Targets` filter consists of one or more [target] prefixes, paired with
+/// [`LevelFilter`]s. If a span or event's [target] begins with one of those
+/// prefixes, and its [level] is at or below the [`LevelFilter`] enabled for
+/// that prefix, then the span or event will be enabled.
+///
+/// This is similar to the behavior implemented by the [`env_logger` crate] in
+/// the `log` ecosystem.
+///
+/// The [`EnvFilter`] type also provided by this crate is very similar to `Targets`,
+/// but is capable of a more sophisticated form of filtering where events may
+/// also be enabled or disabled based on the span they are recorded in.
+/// `Targets` can be thought of as a lighter-weight form of [`EnvFilter`] that
+/// can be used instead when this dynamic filtering is not required.
+///
+/// # Examples
+///
+/// A `Targets` filter can be constructed by programmatically adding targets and
+/// levels to enable:
+///
+/// ```
+/// use tracing_subscriber::{filter, prelude::*};
+/// use tracing_core::Level;
+///
+/// let filter = filter::Targets::new()
+/// // Enable the `INFO` level for anything in `my_crate`
+/// .with_target("my_crate", Level::INFO)
+/// // Enable the `DEBUG` level for a specific module.
+/// .with_target("my_crate::interesting_module", Level::DEBUG);
+///
+/// // Build a new subscriber with the `fmt` layer using the `Targets`
+/// // filter we constructed above.
+/// tracing_subscriber::registry()
+/// .with(tracing_subscriber::fmt::layer())
+/// .with(filter)
+/// .init();
+/// ```
+///
+/// [`LevelFilter::OFF`] can be used to disable a particular target:
+/// ```
+/// use tracing_subscriber::filter::{Targets, LevelFilter};
+/// use tracing_core::Level;
+///
+/// let filter = Targets::new()
+/// .with_target("my_crate", Level::INFO)
+/// // Disable all traces from `annoying_module`.
+/// .with_target("my_crate::annoying_module", LevelFilter::OFF);
+/// # drop(filter);
+/// ```
+///
+/// Alternatively, `Targets` implements [`std::str::FromStr`], allowing it to be
+/// parsed from a comma-delimited list of `target=level` pairs. For example:
+///
+/// ```rust
+/// # fn main() -> Result<(), Box<dyn std::error::Error>> {
+/// use tracing_subscriber::filter;
+/// use tracing_core::Level;
+///
+/// let filter = "my_crate=info,my_crate::interesting_module=trace,other_crate=debug"
+/// .parse::<filter::Targets>()?;
+///
+/// // The parsed filter is identical to a filter constructed using `with_target`:
+/// assert_eq!(
+/// filter,
+/// filter::Targets::new()
+/// .with_target("my_crate", Level::INFO)
+/// .with_target("my_crate::interesting_module", Level::TRACE)
+/// .with_target("other_crate", Level::DEBUG)
+/// );
+/// # Ok(()) }
+/// ```
+///
+/// This is particularly useful when the list of enabled targets is configurable
+/// by the user at runtime.
+///
+/// The `Targets` filter can be used as a [per-layer filter][plf] *and* as a
+/// [global filter]:
+///
+/// ```rust
+/// use tracing_subscriber::{
+/// fmt,
+/// filter::{Targets, LevelFilter},
+/// prelude::*,
+/// };
+/// use tracing_core::Level;
+/// use std::{sync::Arc, fs::File};
+/// # fn docs() -> Result<(), Box<dyn std::error::Error>> {
+///
+/// // A layer that logs events to stdout using the human-readable "pretty"
+/// // format.
+/// let stdout_log = fmt::layer().pretty();
+///
+/// // A layer that logs events to a file, using the JSON format.
+/// let file = File::create("debug_log.json")?;
+/// let debug_log = fmt::layer()
+/// .with_writer(Arc::new(file))
+/// .json();
+///
+/// tracing_subscriber::registry()
+/// // Only log INFO and above to stdout, unless the span or event
+/// // has the `my_crate::cool_module` target prefix.
+/// .with(stdout_log
+/// .with_filter(
+/// Targets::default()
+/// .with_target("my_crate::cool_module", Level::DEBUG)
+/// .with_default(Level::INFO)
+/// )
+/// )
+/// // Log everything enabled by the global filter to `debug_log.json`.
+/// .with(debug_log)
+/// // Configure a global filter for the whole subscriber stack. This will
+/// // control what spans and events are recorded by both the `debug_log`
+/// // and the `stdout_log` layers, and `stdout_log` will *additionally* be
+/// // filtered by its per-layer filter.
+/// .with(
+/// Targets::default()
+/// .with_target("my_crate", Level::TRACE)
+/// .with_target("other_crate", Level::INFO)
+/// .with_target("other_crate::annoying_module", LevelFilter::OFF)
+/// .with_target("third_crate", Level::DEBUG)
+/// ).init();
+/// # Ok(()) }
+///```
+///
+/// [target]: tracing_core::Metadata::target
+/// [level]: tracing_core::Level
+/// [`Filter`]: crate::layer::Filter
+/// [`Layer`]: crate::layer::Layer
+/// [plf]: crate::layer#per-layer-filtering
+/// [global]: crate::layer#global-filtering
+/// [filtering]: crate::layer#filtering-with-layers
+/// [`env_logger` crate]: https://docs.rs/env_logger/0.9.0/env_logger/index.html#enabling-logging
+/// [`EnvFilter`]: crate::filter::EnvFilter
+#[derive(Debug, Default, Clone, PartialEq)]
+pub struct Targets(DirectiveSet<StaticDirective>);
+
+impl Targets {
+ /// Returns a new `Targets` filter.
+ ///
+ /// This filter will enable no targets. Call [`with_target`] or [`with_targets`]
+ /// to add enabled targets, and [`with_default`] to change the default level
+ /// enabled for spans and events that didn't match any of the provided targets.
+ ///
+ /// [`with_target`]: Targets::with_target
+ /// [`with_targets`]: Targets::with_targets
+ /// [`with_default`]: Targets::with_default
+ pub fn new() -> Self {
+ Self::default()
+ }
+
+ /// Enables spans and events with [target]s starting with the provided target
+ /// prefix if they are at or below the provided [`LevelFilter`].
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing_subscriber::filter;
+ /// use tracing_core::Level;
+ ///
+ /// let filter = filter::Targets::new()
+ /// // Enable the `INFO` level for anything in `my_crate`
+ /// .with_target("my_crate", Level::INFO)
+ /// // Enable the `DEBUG` level for a specific module.
+ /// .with_target("my_crate::interesting_module", Level::DEBUG);
+ /// # drop(filter);
+ /// ```
+ ///
+ /// [`LevelFilter::OFF`] can be used to disable a particular target:
+ /// ```
+ /// use tracing_subscriber::filter::{Targets, LevelFilter};
+ /// use tracing_core::Level;
+ ///
+ /// let filter = Targets::new()
+ /// .with_target("my_crate", Level::INFO)
+ /// // Disable all traces from `annoying_module`.
+ /// .with_target("my_crate::interesting_module", LevelFilter::OFF);
+ /// # drop(filter);
+ /// ```
+ ///
+ /// [target]: tracing_core::Metadata::target
+ pub fn with_target(mut self, target: impl Into<String>, level: impl Into<LevelFilter>) -> Self {
+ self.0.add(StaticDirective::new(
+ Some(target.into()),
+ Default::default(),
+ level.into(),
+ ));
+ self
+ }
+ /// Adds [target]s from an iterator of [target]-[`LevelFilter`] pairs to this filter.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing_subscriber::filter;
+ /// use tracing_core::Level;
+ ///
+ /// let filter = filter::Targets::new()
+ /// .with_targets(vec![
+ /// ("my_crate", Level::INFO),
+ /// ("my_crate::some_module", Level::DEBUG),
+ /// ("my_crate::other_module::cool_stuff", Level::TRACE),
+ /// ("other_crate", Level::WARN)
+ /// ]);
+ /// # drop(filter);
+ /// ```
+ ///
+ /// [`LevelFilter::OFF`] can be used to disable a particular target:
+ /// ```
+ /// use tracing_subscriber::filter::{Targets, LevelFilter};
+ /// use tracing_core::Level;
+ ///
+ /// let filter = Targets::new()
+ /// .with_target("my_crate", Level::INFO)
+ /// // Disable all traces from `annoying_module`.
+ /// .with_target("my_crate::interesting_module", LevelFilter::OFF);
+ /// # drop(filter);
+ /// ```
+ ///
+ /// [target]: tracing_core::Metadata::target
+ pub fn with_targets<T, L>(mut self, targets: impl IntoIterator<Item = (T, L)>) -> Self
+ where
+ String: From<T>,
+ LevelFilter: From<L>,
+ {
+ self.extend(targets);
+ self
+ }
+
+ /// Sets the default level to enable for spans and events whose targets did
+ /// not match any of the configured prefixes.
+ ///
+ /// By default, this is [`LevelFilter::OFF`]. This means that spans and
+ /// events will only be enabled if they match one of the configured target
+ /// prefixes. If this is changed to a different [`LevelFilter`], spans and
+ /// events with targets that did not match any of the configured prefixes
+ /// will be enabled if their level is at or below the provided level.
+ pub fn with_default(mut self, level: impl Into<LevelFilter>) -> Self {
+ self.0
+ .add(StaticDirective::new(None, Default::default(), level.into()));
+ self
+ }
+
+ /// Returns an iterator over the [target]-[`LevelFilter`] pairs in this filter.
+ ///
+ /// The order of iteration is undefined.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing_subscriber::filter::{Targets, LevelFilter};
+ /// use tracing_core::Level;
+ ///
+ /// let filter = Targets::new()
+ /// .with_target("my_crate", Level::INFO)
+ /// .with_target("my_crate::interesting_module", Level::DEBUG);
+ ///
+ /// let mut targets: Vec<_> = filter.iter().collect();
+ /// targets.sort();
+ ///
+ /// assert_eq!(targets, vec![
+ /// ("my_crate", LevelFilter::INFO),
+ /// ("my_crate::interesting_module", LevelFilter::DEBUG),
+ /// ]);
+ /// ```
+ ///
+ /// [target]: tracing_core::Metadata::target
+ pub fn iter(&self) -> Iter<'_> {
+ self.into_iter()
+ }
+
+ #[inline]
+ fn interested(&self, metadata: &'static Metadata<'static>) -> Interest {
+ if self.0.enabled(metadata) {
+ Interest::always()
+ } else {
+ Interest::never()
+ }
+ }
+}
+
+impl<T, L> Extend<(T, L)> for Targets
+where
+ T: Into<String>,
+ L: Into<LevelFilter>,
+{
+ fn extend<I: IntoIterator<Item = (T, L)>>(&mut self, iter: I) {
+ let iter = iter.into_iter().map(|(target, level)| {
+ StaticDirective::new(Some(target.into()), Default::default(), level.into())
+ });
+ self.0.extend(iter);
+ }
+}
+
+impl<T, L> FromIterator<(T, L)> for Targets
+where
+ T: Into<String>,
+ L: Into<LevelFilter>,
+{
+ fn from_iter<I: IntoIterator<Item = (T, L)>>(iter: I) -> Self {
+ let mut this = Self::default();
+ this.extend(iter);
+ this
+ }
+}
+
+impl FromStr for Targets {
+ type Err = ParseError;
+ fn from_str(s: &str) -> Result<Self, Self::Err> {
+ s.split(',')
+ .map(StaticDirective::from_str)
+ .collect::<Result<_, _>>()
+ .map(Self)
+ }
+}
+
+impl<S> layer::Layer<S> for Targets
+where
+ S: Subscriber,
+{
+ fn enabled(&self, metadata: &Metadata<'_>, _: layer::Context<'_, S>) -> bool {
+ self.0.enabled(metadata)
+ }
+
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ self.interested(metadata)
+ }
+
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ Some(self.0.max_level)
+ }
+}
+
+#[cfg(feature = "registry")]
+#[cfg_attr(docsrs, doc(cfg(feature = "registry")))]
+impl<S> layer::Filter<S> for Targets {
+ fn enabled(&self, metadata: &Metadata<'_>, _: &layer::Context<'_, S>) -> bool {
+ self.0.enabled(metadata)
+ }
+
+ fn callsite_enabled(&self, metadata: &'static Metadata<'static>) -> Interest {
+ self.interested(metadata)
+ }
+
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ Some(self.0.max_level)
+ }
+}
+
+impl IntoIterator for Targets {
+ type Item = (String, LevelFilter);
+
+ type IntoIter = IntoIter;
+
+ fn into_iter(self) -> Self::IntoIter {
+ IntoIter::new(self)
+ }
+}
+
+impl<'a> IntoIterator for &'a Targets {
+ type Item = (&'a str, LevelFilter);
+
+ type IntoIter = Iter<'a>;
+
+ fn into_iter(self) -> Self::IntoIter {
+ Iter::new(self)
+ }
+}
+
+/// An owning iterator over the [target]-[level] pairs of a `Targets` filter.
+///
+/// This struct is created by the `IntoIterator` trait implementation of [`Targets`].
+///
+/// # Examples
+///
+/// Merge the targets from one `Targets` with another:
+///
+/// ```
+/// use tracing_subscriber::filter::Targets;
+/// use tracing_core::Level;
+///
+/// let mut filter = Targets::new().with_target("my_crate", Level::INFO);
+/// let overrides = Targets::new().with_target("my_crate::interesting_module", Level::DEBUG);
+///
+/// filter.extend(overrides);
+/// # drop(filter);
+/// ```
+///
+/// [target]: tracing_core::Metadata::target
+/// [level]: tracing_core::Level
+#[derive(Debug)]
+pub struct IntoIter(
+ #[allow(clippy::type_complexity)] // alias indirection would probably make this more confusing
+ FilterMap<
+ <DirectiveSet<StaticDirective> as IntoIterator>::IntoIter,
+ fn(StaticDirective) -> Option<(String, LevelFilter)>,
+ >,
+);
+
+impl IntoIter {
+ fn new(targets: Targets) -> Self {
+ Self(targets.0.into_iter().filter_map(|directive| {
+ let level = directive.level;
+ directive.target.map(|target| (target, level))
+ }))
+ }
+}
+
+impl Iterator for IntoIter {
+ type Item = (String, LevelFilter);
+
+ fn next(&mut self) -> Option<Self::Item> {
+ self.0.next()
+ }
+
+ fn size_hint(&self) -> (usize, Option<usize>) {
+ self.0.size_hint()
+ }
+}
+
+/// A borrowing iterator over the [target]-[level] pairs of a `Targets` filter.
+///
+/// This struct is created by [`iter`] method of [`Targets`], or from the `IntoIterator`
+/// implementation for `&Targets`.
+///
+/// [target]: tracing_core::Metadata::target
+/// [level]: tracing_core::Level
+/// [`iter`]: Targets::iter
+#[derive(Debug)]
+pub struct Iter<'a>(
+ FilterMap<
+ slice::Iter<'a, StaticDirective>,
+ fn(&'a StaticDirective) -> Option<(&'a str, LevelFilter)>,
+ >,
+);
+
+impl<'a> Iter<'a> {
+ fn new(targets: &'a Targets) -> Self {
+ Self(targets.0.iter().filter_map(|directive| {
+ directive
+ .target
+ .as_deref()
+ .map(|target| (target, directive.level))
+ }))
+ }
+}
+
+impl<'a> Iterator for Iter<'a> {
+ type Item = (&'a str, LevelFilter);
+
+ fn next(&mut self) -> Option<Self::Item> {
+ self.0.next()
+ }
+
+ fn size_hint(&self) -> (usize, Option<usize>) {
+ self.0.size_hint()
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ feature! {
+ #![not(feature = "std")]
+ use alloc::{vec, vec::Vec, string::ToString};
+
+ // `dbg!` is only available with `libstd`; just nop it out when testing
+ // with alloc only.
+ macro_rules! dbg {
+ ($x:expr) => { $x }
+ }
+ }
+
+ fn expect_parse(s: &str) -> Targets {
+ match dbg!(s).parse::<Targets>() {
+ Err(e) => panic!("string {:?} did not parse successfully: {}", s, e),
+ Ok(e) => e,
+ }
+ }
+
+ fn expect_parse_ralith(s: &str) {
+ let dirs = expect_parse(s).0.into_vec();
+ assert_eq!(dirs.len(), 2, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("server".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[0].field_names, Vec::<String>::new());
+
+ assert_eq!(dirs[1].target, Some("common".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::INFO);
+ assert_eq!(dirs[1].field_names, Vec::<String>::new());
+ }
+
+ fn expect_parse_level_directives(s: &str) {
+ let dirs = expect_parse(s).0.into_vec();
+ assert_eq!(dirs.len(), 6, "\nparsed: {:#?}", dirs);
+
+ assert_eq!(dirs[0].target, Some("crate3::mod2::mod1".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::OFF);
+ assert_eq!(dirs[0].field_names, Vec::<String>::new());
+
+ assert_eq!(dirs[1].target, Some("crate1::mod2::mod3".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::INFO);
+ assert_eq!(dirs[1].field_names, Vec::<String>::new());
+
+ assert_eq!(dirs[2].target, Some("crate1::mod2".to_string()));
+ assert_eq!(dirs[2].level, LevelFilter::WARN);
+ assert_eq!(dirs[2].field_names, Vec::<String>::new());
+
+ assert_eq!(dirs[3].target, Some("crate1::mod1".to_string()));
+ assert_eq!(dirs[3].level, LevelFilter::ERROR);
+ assert_eq!(dirs[3].field_names, Vec::<String>::new());
+
+ assert_eq!(dirs[4].target, Some("crate3".to_string()));
+ assert_eq!(dirs[4].level, LevelFilter::TRACE);
+ assert_eq!(dirs[4].field_names, Vec::<String>::new());
+
+ assert_eq!(dirs[5].target, Some("crate2".to_string()));
+ assert_eq!(dirs[5].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[5].field_names, Vec::<String>::new());
+ }
+
+ #[test]
+ fn parse_ralith() {
+ expect_parse_ralith("common=info,server=debug");
+ }
+
+ #[test]
+ fn parse_ralith_uc() {
+ expect_parse_ralith("common=INFO,server=DEBUG");
+ }
+
+ #[test]
+ fn parse_ralith_mixed() {
+ expect_parse("common=iNfo,server=dEbUg");
+ }
+
+ #[test]
+ fn expect_parse_valid() {
+ let dirs = expect_parse("crate1::mod1=error,crate1::mod2,crate2=debug,crate3=off")
+ .0
+ .into_vec();
+ assert_eq!(dirs.len(), 4, "\nparsed: {:#?}", dirs);
+ assert_eq!(dirs[0].target, Some("crate1::mod2".to_string()));
+ assert_eq!(dirs[0].level, LevelFilter::TRACE);
+ assert_eq!(dirs[0].field_names, Vec::<String>::new());
+
+ assert_eq!(dirs[1].target, Some("crate1::mod1".to_string()));
+ assert_eq!(dirs[1].level, LevelFilter::ERROR);
+ assert_eq!(dirs[1].field_names, Vec::<String>::new());
+
+ assert_eq!(dirs[2].target, Some("crate3".to_string()));
+ assert_eq!(dirs[2].level, LevelFilter::OFF);
+ assert_eq!(dirs[2].field_names, Vec::<String>::new());
+
+ assert_eq!(dirs[3].target, Some("crate2".to_string()));
+ assert_eq!(dirs[3].level, LevelFilter::DEBUG);
+ assert_eq!(dirs[3].field_names, Vec::<String>::new());
+ }
+
+ #[test]
+ fn parse_level_directives() {
+ expect_parse_level_directives(
+ "crate1::mod1=error,crate1::mod2=warn,crate1::mod2::mod3=info,\
+ crate2=debug,crate3=trace,crate3::mod2::mod1=off",
+ )
+ }
+
+ #[test]
+ fn parse_uppercase_level_directives() {
+ expect_parse_level_directives(
+ "crate1::mod1=ERROR,crate1::mod2=WARN,crate1::mod2::mod3=INFO,\
+ crate2=DEBUG,crate3=TRACE,crate3::mod2::mod1=OFF",
+ )
+ }
+
+ #[test]
+ fn parse_numeric_level_directives() {
+ expect_parse_level_directives(
+ "crate1::mod1=1,crate1::mod2=2,crate1::mod2::mod3=3,crate2=4,\
+ crate3=5,crate3::mod2::mod1=0",
+ )
+ }
+
+ #[test]
+ fn targets_iter() {
+ let filter = expect_parse("crate1::mod1=error,crate1::mod2,crate2=debug,crate3=off")
+ .with_default(LevelFilter::WARN);
+
+ let mut targets: Vec<_> = filter.iter().collect();
+ targets.sort();
+
+ assert_eq!(
+ targets,
+ vec![
+ ("crate1::mod1", LevelFilter::ERROR),
+ ("crate1::mod2", LevelFilter::TRACE),
+ ("crate2", LevelFilter::DEBUG),
+ ("crate3", LevelFilter::OFF),
+ ]
+ );
+ }
+
+ #[test]
+ fn targets_into_iter() {
+ let filter = expect_parse("crate1::mod1=error,crate1::mod2,crate2=debug,crate3=off")
+ .with_default(LevelFilter::WARN);
+
+ let mut targets: Vec<_> = filter.into_iter().collect();
+ targets.sort();
+
+ assert_eq!(
+ targets,
+ vec![
+ ("crate1::mod1".to_string(), LevelFilter::ERROR),
+ ("crate1::mod2".to_string(), LevelFilter::TRACE),
+ ("crate2".to_string(), LevelFilter::DEBUG),
+ ("crate3".to_string(), LevelFilter::OFF),
+ ]
+ );
+ }
+
+ #[test]
+ // `println!` is only available with `libstd`.
+ #[cfg(feature = "std")]
+ fn size_of_filters() {
+ fn print_sz(s: &str) {
+ let filter = s.parse::<Targets>().expect("filter should parse");
+ println!(
+ "size_of_val({:?})\n -> {}B",
+ s,
+ std::mem::size_of_val(&filter)
+ );
+ }
+
+ print_sz("info");
+
+ print_sz("foo=debug");
+
+ print_sz(
+ "crate1::mod1=error,crate1::mod2=warn,crate1::mod2::mod3=info,\
+ crate2=debug,crate3=trace,crate3::mod2::mod1=off",
+ );
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/fmt/fmt_layer.rs b/vendor/tracing-subscriber-0.3.3/src/fmt/fmt_layer.rs
new file mode 100644
index 000000000..0e0d5e0eb
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/fmt/fmt_layer.rs
@@ -0,0 +1,1205 @@
+use crate::{
+ field::RecordFields,
+ fmt::{format, FormatEvent, FormatFields, MakeWriter, TestWriter},
+ layer::{self, Context},
+ registry::{self, LookupSpan, SpanRef},
+};
+use format::{FmtSpan, TimingDisplay};
+use std::{any::TypeId, cell::RefCell, fmt, io, marker::PhantomData, ops::Deref, time::Instant};
+use tracing_core::{
+ field,
+ span::{Attributes, Current, Id, Record},
+ Event, Metadata, Subscriber,
+};
+
+/// A [`Layer`] that logs formatted representations of `tracing` events.
+///
+/// ## Examples
+///
+/// Constructing a layer with the default configuration:
+///
+/// ```rust
+/// use tracing_subscriber::{fmt, Registry};
+/// use tracing_subscriber::prelude::*;
+///
+/// let subscriber = Registry::default()
+/// .with(fmt::Layer::default());
+///
+/// tracing::subscriber::set_global_default(subscriber).unwrap();
+/// ```
+///
+/// Overriding the layer's behavior:
+///
+/// ```rust
+/// use tracing_subscriber::{fmt, Registry};
+/// use tracing_subscriber::prelude::*;
+///
+/// let fmt_layer = fmt::layer()
+/// .with_target(false) // don't include event targets when logging
+/// .with_level(false); // don't include event levels when logging
+///
+/// let subscriber = Registry::default().with(fmt_layer);
+/// # tracing::subscriber::set_global_default(subscriber).unwrap();
+/// ```
+///
+/// Setting a custom event formatter:
+///
+/// ```rust
+/// use tracing_subscriber::fmt::{self, format, time};
+/// use tracing_subscriber::prelude::*;
+///
+/// let fmt = format().with_timer(time::Uptime::default());
+/// let fmt_layer = fmt::layer()
+/// .event_format(fmt)
+/// .with_target(false);
+/// # let subscriber = fmt_layer.with_subscriber(tracing_subscriber::registry::Registry::default());
+/// # tracing::subscriber::set_global_default(subscriber).unwrap();
+/// ```
+///
+/// [`Layer`]: ../layer/trait.Layer.html
+#[cfg_attr(docsrs, doc(cfg(all(feature = "fmt", feature = "std"))))]
+#[derive(Debug)]
+pub struct Layer<
+ S,
+ N = format::DefaultFields,
+ E = format::Format<format::Full>,
+ W = fn() -> io::Stdout,
+> {
+ make_writer: W,
+ fmt_fields: N,
+ fmt_event: E,
+ fmt_span: format::FmtSpanConfig,
+ is_ansi: bool,
+ _inner: PhantomData<S>,
+}
+
+impl<S> Layer<S> {
+ /// Returns a new [`Layer`](struct.Layer.html) with the default configuration.
+ pub fn new() -> Self {
+ Self::default()
+ }
+}
+
+// This needs to be a seperate impl block because they place different bounds on the type parameters.
+impl<S, N, E, W> Layer<S, N, E, W>
+where
+ S: Subscriber + for<'a> LookupSpan<'a>,
+ N: for<'writer> FormatFields<'writer> + 'static,
+ W: for<'writer> MakeWriter<'writer> + 'static,
+{
+ /// Sets the [event formatter][`FormatEvent`] that the layer will use to
+ /// format events.
+ ///
+ /// The event formatter may be any type implementing the [`FormatEvent`]
+ /// trait, which is implemented for all functions taking a [`FmtContext`], a
+ /// [`Writer`], and an [`Event`].
+ ///
+ /// # Examples
+ ///
+ /// Setting a type implementing [`FormatEvent`] as the formatter:
+ /// ```rust
+ /// use tracing_subscriber::fmt::{self, format};
+ ///
+ /// let layer = fmt::layer()
+ /// .event_format(format().compact());
+ /// # // this is necessary for type inference.
+ /// # use tracing_subscriber::Layer as _;
+ /// # let _ = layer.with_subscriber(tracing_subscriber::registry::Registry::default());
+ /// ```
+ /// [`FormatEvent`]: format::FormatEvent
+ /// [`Event`]: tracing::Event
+ /// [`Writer`]: crate::format::Writer
+ pub fn event_format<E2>(self, e: E2) -> Layer<S, N, E2, W>
+ where
+ E2: FormatEvent<S, N> + 'static,
+ {
+ Layer {
+ fmt_fields: self.fmt_fields,
+ fmt_event: e,
+ fmt_span: self.fmt_span,
+ make_writer: self.make_writer,
+ is_ansi: self.is_ansi,
+ _inner: self._inner,
+ }
+ }
+}
+
+// This needs to be a seperate impl block because they place different bounds on the type parameters.
+impl<S, N, E, W> Layer<S, N, E, W> {
+ /// Sets the [`MakeWriter`] that the [`Layer`] being built will use to write events.
+ ///
+ /// # Examples
+ ///
+ /// Using `stderr` rather than `stdout`:
+ ///
+ /// ```rust
+ /// use std::io;
+ /// use tracing_subscriber::fmt;
+ ///
+ /// let layer = fmt::layer()
+ /// .with_writer(io::stderr);
+ /// # // this is necessary for type inference.
+ /// # use tracing_subscriber::Layer as _;
+ /// # let _ = layer.with_subscriber(tracing_subscriber::registry::Registry::default());
+ /// ```
+ ///
+ /// [`MakeWriter`]: ../fmt/trait.MakeWriter.html
+ /// [`Layer`]: ../layer/trait.Layer.html
+ pub fn with_writer<W2>(self, make_writer: W2) -> Layer<S, N, E, W2>
+ where
+ W2: for<'writer> MakeWriter<'writer> + 'static,
+ {
+ Layer {
+ fmt_fields: self.fmt_fields,
+ fmt_event: self.fmt_event,
+ fmt_span: self.fmt_span,
+ is_ansi: self.is_ansi,
+ make_writer,
+ _inner: self._inner,
+ }
+ }
+
+ /// Configures the subscriber to support [`libtest`'s output capturing][capturing] when used in
+ /// unit tests.
+ ///
+ /// See [`TestWriter`] for additional details.
+ ///
+ /// # Examples
+ ///
+ /// Using [`TestWriter`] to let `cargo test` capture test output:
+ ///
+ /// ```rust
+ /// use std::io;
+ /// use tracing_subscriber::fmt;
+ ///
+ /// let layer = fmt::layer()
+ /// .with_test_writer();
+ /// # // this is necessary for type inference.
+ /// # use tracing_subscriber::Layer as _;
+ /// # let _ = layer.with_subscriber(tracing_subscriber::registry::Registry::default());
+ /// ```
+ /// [capturing]:
+ /// https://doc.rust-lang.org/book/ch11-02-running-tests.html#showing-function-output
+ /// [`TestWriter`]: writer/struct.TestWriter.html
+ pub fn with_test_writer(self) -> Layer<S, N, E, TestWriter> {
+ Layer {
+ fmt_fields: self.fmt_fields,
+ fmt_event: self.fmt_event,
+ fmt_span: self.fmt_span,
+ is_ansi: self.is_ansi,
+ make_writer: TestWriter::default(),
+ _inner: self._inner,
+ }
+ }
+
+ /// Enable ANSI terminal colors for formatted output.
+ #[cfg(feature = "ansi")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "ansi")))]
+ pub fn with_ansi(self, ansi: bool) -> Self {
+ Self {
+ is_ansi: ansi,
+ ..self
+ }
+ }
+}
+
+impl<S, N, L, T, W> Layer<S, N, format::Format<L, T>, W>
+where
+ N: for<'writer> FormatFields<'writer> + 'static,
+{
+ /// Use the given [`timer`] for span and event timestamps.
+ ///
+ /// See the [`time` module] for the provided timer implementations.
+ ///
+ /// Note that using the `"time`"" feature flag enables the
+ /// additional time formatters [`UtcTime`] and [`LocalTime`], which use the
+ /// [`time` crate] to provide more sophisticated timestamp formatting
+ /// options.
+ ///
+ /// [`timer`]: super::time::FormatTime
+ /// [`time` module]: mod@super::time
+ /// [`UtcTime`]: super::time::UtcTime
+ /// [`LocalTime`]: super::time::LocalTime
+ /// [`time` crate]: https://docs.rs/time/0.3
+ pub fn with_timer<T2>(self, timer: T2) -> Layer<S, N, format::Format<L, T2>, W> {
+ Layer {
+ fmt_event: self.fmt_event.with_timer(timer),
+ fmt_fields: self.fmt_fields,
+ fmt_span: self.fmt_span,
+ make_writer: self.make_writer,
+ is_ansi: self.is_ansi,
+ _inner: self._inner,
+ }
+ }
+
+ /// Do not emit timestamps with spans and event.
+ pub fn without_time(self) -> Layer<S, N, format::Format<L, ()>, W> {
+ Layer {
+ fmt_event: self.fmt_event.without_time(),
+ fmt_fields: self.fmt_fields,
+ fmt_span: self.fmt_span.without_time(),
+ make_writer: self.make_writer,
+ is_ansi: self.is_ansi,
+ _inner: self._inner,
+ }
+ }
+
+ /// Configures how synthesized events are emitted at points in the [span
+ /// lifecycle][lifecycle].
+ ///
+ /// The following options are available:
+ ///
+ /// - `FmtSpan::NONE`: No events will be synthesized when spans are
+ /// created, entered, exited, or closed. Data from spans will still be
+ /// included as the context for formatted events. This is the default.
+ /// - `FmtSpan::NEW`: An event will be synthesized when spans are created.
+ /// - `FmtSpan::ENTER`: An event will be synthesized when spans are entered.
+ /// - `FmtSpan::EXIT`: An event will be synthesized when spans are exited.
+ /// - `FmtSpan::CLOSE`: An event will be synthesized when a span closes. If
+ /// [timestamps are enabled][time] for this formatter, the generated
+ /// event will contain fields with the span's _busy time_ (the total
+ /// time for which it was entered) and _idle time_ (the total time that
+ /// the span existed but was not entered).
+ /// - `FmtSpan::ACTIVE`: Events will be synthesized when spans are entered
+ /// or exited.
+ /// - `FmtSpan::FULL`: Events will be synthesized whenever a span is
+ /// created, entered, exited, or closed. If timestamps are enabled, the
+ /// close event will contain the span's busy and idle time, as
+ /// described above.
+ ///
+ /// The options can be enabled in any combination. For instance, the following
+ /// will synthesize events whenever spans are created and closed:
+ ///
+ /// ```rust
+ /// use tracing_subscriber::fmt;
+ /// use tracing_subscriber::fmt::format::FmtSpan;
+ ///
+ /// let subscriber = fmt()
+ /// .with_span_events(FmtSpan::NEW | FmtSpan::CLOSE)
+ /// .finish();
+ /// ```
+ ///
+ /// Note that the generated events will only be part of the log output by
+ /// this formatter; they will not be recorded by other `Subscriber`s or by
+ /// `Layer`s added to this subscriber.
+ ///
+ /// [lifecycle]: https://docs.rs/tracing/latest/tracing/span/index.html#the-span-lifecycle
+ /// [time]: #method.without_time
+ pub fn with_span_events(self, kind: FmtSpan) -> Self {
+ Layer {
+ fmt_span: self.fmt_span.with_kind(kind),
+ ..self
+ }
+ }
+
+ /// Sets whether or not an event's target is displayed.
+ pub fn with_target(self, display_target: bool) -> Layer<S, N, format::Format<L, T>, W> {
+ Layer {
+ fmt_event: self.fmt_event.with_target(display_target),
+ ..self
+ }
+ }
+
+ /// Sets whether or not an event's level is displayed.
+ pub fn with_level(self, display_level: bool) -> Layer<S, N, format::Format<L, T>, W> {
+ Layer {
+ fmt_event: self.fmt_event.with_level(display_level),
+ ..self
+ }
+ }
+
+ /// Sets whether or not the [thread ID] of the current thread is displayed
+ /// when formatting events
+ ///
+ /// [thread ID]: https://doc.rust-lang.org/stable/std/thread/struct.ThreadId.html
+ pub fn with_thread_ids(self, display_thread_ids: bool) -> Layer<S, N, format::Format<L, T>, W> {
+ Layer {
+ fmt_event: self.fmt_event.with_thread_ids(display_thread_ids),
+ ..self
+ }
+ }
+
+ /// Sets whether or not the [name] of the current thread is displayed
+ /// when formatting events
+ ///
+ /// [name]: https://doc.rust-lang.org/stable/std/thread/index.html#naming-threads
+ pub fn with_thread_names(
+ self,
+ display_thread_names: bool,
+ ) -> Layer<S, N, format::Format<L, T>, W> {
+ Layer {
+ fmt_event: self.fmt_event.with_thread_names(display_thread_names),
+ ..self
+ }
+ }
+
+ /// Sets the layer being built to use a [less verbose formatter](../fmt/format/struct.Compact.html).
+ pub fn compact(self) -> Layer<S, N, format::Format<format::Compact, T>, W>
+ where
+ N: for<'writer> FormatFields<'writer> + 'static,
+ {
+ Layer {
+ fmt_event: self.fmt_event.compact(),
+ fmt_fields: self.fmt_fields,
+ fmt_span: self.fmt_span,
+ make_writer: self.make_writer,
+ is_ansi: self.is_ansi,
+ _inner: self._inner,
+ }
+ }
+
+ /// Sets the layer being built to use an [excessively pretty, human-readable formatter](crate::fmt::format::Pretty).
+ #[cfg(feature = "ansi")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "ansi")))]
+ pub fn pretty(self) -> Layer<S, format::Pretty, format::Format<format::Pretty, T>, W> {
+ Layer {
+ fmt_event: self.fmt_event.pretty(),
+ fmt_fields: format::Pretty::default(),
+ fmt_span: self.fmt_span,
+ make_writer: self.make_writer,
+ is_ansi: self.is_ansi,
+ _inner: self._inner,
+ }
+ }
+
+ /// Sets the layer being built to use a [JSON formatter](../fmt/format/struct.Json.html).
+ ///
+ /// The full format includes fields from all entered spans.
+ ///
+ /// # Example Output
+ ///
+ /// ```ignore,json
+ /// {"timestamp":"Feb 20 11:28:15.096","level":"INFO","target":"mycrate","fields":{"message":"some message", "key": "value"}}
+ /// ```
+ ///
+ /// # Options
+ ///
+ /// - [`Layer::flatten_event`] can be used to enable flattening event fields into the root
+ /// object.
+ ///
+ /// [`Layer::flatten_event`]: #method.flatten_event
+ #[cfg(feature = "json")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+ pub fn json(self) -> Layer<S, format::JsonFields, format::Format<format::Json, T>, W> {
+ Layer {
+ fmt_event: self.fmt_event.json(),
+ fmt_fields: format::JsonFields::new(),
+ fmt_span: self.fmt_span,
+ make_writer: self.make_writer,
+ // always disable ANSI escapes in JSON mode!
+ is_ansi: false,
+ _inner: self._inner,
+ }
+ }
+}
+
+#[cfg(feature = "json")]
+#[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+impl<S, T, W> Layer<S, format::JsonFields, format::Format<format::Json, T>, W> {
+ /// Sets the JSON layer being built to flatten event metadata.
+ ///
+ /// See [`format::Json`](../fmt/format/struct.Json.html)
+ pub fn flatten_event(
+ self,
+ flatten_event: bool,
+ ) -> Layer<S, format::JsonFields, format::Format<format::Json, T>, W> {
+ Layer {
+ fmt_event: self.fmt_event.flatten_event(flatten_event),
+ fmt_fields: format::JsonFields::new(),
+ ..self
+ }
+ }
+
+ /// Sets whether or not the formatter will include the current span in
+ /// formatted events.
+ ///
+ /// See [`format::Json`](../fmt/format/struct.Json.html)
+ pub fn with_current_span(
+ self,
+ display_current_span: bool,
+ ) -> Layer<S, format::JsonFields, format::Format<format::Json, T>, W> {
+ Layer {
+ fmt_event: self.fmt_event.with_current_span(display_current_span),
+ fmt_fields: format::JsonFields::new(),
+ ..self
+ }
+ }
+
+ /// Sets whether or not the formatter will include a list (from root to leaf)
+ /// of all currently entered spans in formatted events.
+ ///
+ /// See [`format::Json`](../fmt/format/struct.Json.html)
+ pub fn with_span_list(
+ self,
+ display_span_list: bool,
+ ) -> Layer<S, format::JsonFields, format::Format<format::Json, T>, W> {
+ Layer {
+ fmt_event: self.fmt_event.with_span_list(display_span_list),
+ fmt_fields: format::JsonFields::new(),
+ ..self
+ }
+ }
+}
+
+impl<S, N, E, W> Layer<S, N, E, W> {
+ /// Sets the field formatter that the layer being built will use to record
+ /// fields.
+ pub fn fmt_fields<N2>(self, fmt_fields: N2) -> Layer<S, N2, E, W>
+ where
+ N2: for<'writer> FormatFields<'writer> + 'static,
+ {
+ Layer {
+ fmt_event: self.fmt_event,
+ fmt_fields,
+ fmt_span: self.fmt_span,
+ make_writer: self.make_writer,
+ is_ansi: self.is_ansi,
+ _inner: self._inner,
+ }
+ }
+}
+
+impl<S> Default for Layer<S> {
+ fn default() -> Self {
+ Layer {
+ fmt_fields: format::DefaultFields::default(),
+ fmt_event: format::Format::default(),
+ fmt_span: format::FmtSpanConfig::default(),
+ make_writer: io::stdout,
+ is_ansi: cfg!(feature = "ansi"),
+ _inner: PhantomData,
+ }
+ }
+}
+
+impl<S, N, E, W> Layer<S, N, E, W>
+where
+ S: Subscriber + for<'a> LookupSpan<'a>,
+ N: for<'writer> FormatFields<'writer> + 'static,
+ E: FormatEvent<S, N> + 'static,
+ W: for<'writer> MakeWriter<'writer> + 'static,
+{
+ #[inline]
+ fn make_ctx<'a>(&'a self, ctx: Context<'a, S>, event: &'a Event<'a>) -> FmtContext<'a, S, N> {
+ FmtContext {
+ ctx,
+ fmt_fields: &self.fmt_fields,
+ event,
+ }
+ }
+}
+
+/// A formatted representation of a span's fields stored in its [extensions].
+///
+/// Because `FormattedFields` is generic over the type of the formatter that
+/// produced it, multiple versions of a span's formatted fields can be stored in
+/// the [`Extensions`][extensions] type-map. This means that when multiple
+/// formatters are in use, each can store its own formatted representation
+/// without conflicting.
+///
+/// [extensions]: ../registry/struct.Extensions.html
+#[derive(Default)]
+pub struct FormattedFields<E: ?Sized> {
+ _format_fields: PhantomData<fn(E)>,
+ was_ansi: bool,
+ /// The formatted fields of a span.
+ pub fields: String,
+}
+
+impl<E: ?Sized> FormattedFields<E> {
+ /// Returns a new `FormattedFields`.
+ pub fn new(fields: String) -> Self {
+ Self {
+ fields,
+ was_ansi: false,
+ _format_fields: PhantomData,
+ }
+ }
+
+ /// Returns a new [`format::Writer`] for writing to this `FormattedFields`.
+ ///
+ /// The returned [`format::Writer`] can be used with the
+ /// [`FormatFields::format_fields`] method.
+ pub fn as_writer(&mut self) -> format::Writer<'_> {
+ format::Writer::new(&mut self.fields).with_ansi(self.was_ansi)
+ }
+}
+
+impl<E: ?Sized> fmt::Debug for FormattedFields<E> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("FormattedFields")
+ .field("fields", &self.fields)
+ .field("formatter", &format_args!("{}", std::any::type_name::<E>()))
+ .field("was_ansi", &self.was_ansi)
+ .finish()
+ }
+}
+
+impl<E: ?Sized> fmt::Display for FormattedFields<E> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ fmt::Display::fmt(&self.fields, f)
+ }
+}
+
+impl<E: ?Sized> Deref for FormattedFields<E> {
+ type Target = String;
+ fn deref(&self) -> &Self::Target {
+ &self.fields
+ }
+}
+
+// === impl FmtLayer ===
+
+macro_rules! with_event_from_span {
+ ($id:ident, $span:ident, $($field:literal = $value:expr),*, |$event:ident| $code:block) => {
+ let meta = $span.metadata();
+ let cs = meta.callsite();
+ let fs = field::FieldSet::new(&[$($field),*], cs);
+ #[allow(unused)]
+ let mut iter = fs.iter();
+ let v = [$(
+ (&iter.next().unwrap(), Some(&$value as &dyn field::Value)),
+ )*];
+ let vs = fs.value_set(&v);
+ let $event = Event::new_child_of($id, meta, &vs);
+ $code
+ };
+}
+
+impl<S, N, E, W> layer::Layer<S> for Layer<S, N, E, W>
+where
+ S: Subscriber + for<'a> LookupSpan<'a>,
+ N: for<'writer> FormatFields<'writer> + 'static,
+ E: FormatEvent<S, N> + 'static,
+ W: for<'writer> MakeWriter<'writer> + 'static,
+{
+ fn on_new_span(&self, attrs: &Attributes<'_>, id: &Id, ctx: Context<'_, S>) {
+ let span = ctx.span(id).expect("Span not found, this is a bug");
+ let mut extensions = span.extensions_mut();
+
+ if extensions.get_mut::<FormattedFields<N>>().is_none() {
+ let mut fields = FormattedFields::<N>::new(String::new());
+ if self
+ .fmt_fields
+ .format_fields(fields.as_writer().with_ansi(self.is_ansi), attrs)
+ .is_ok()
+ {
+ fields.was_ansi = self.is_ansi;
+ extensions.insert(fields);
+ }
+ }
+
+ if self.fmt_span.fmt_timing
+ && self.fmt_span.trace_close()
+ && extensions.get_mut::<Timings>().is_none()
+ {
+ extensions.insert(Timings::new());
+ }
+
+ if self.fmt_span.trace_new() {
+ with_event_from_span!(id, span, "message" = "new", |event| {
+ drop(extensions);
+ drop(span);
+ self.on_event(&event, ctx);
+ });
+ }
+ }
+
+ fn on_record(&self, id: &Id, values: &Record<'_>, ctx: Context<'_, S>) {
+ let span = ctx.span(id).expect("Span not found, this is a bug");
+ let mut extensions = span.extensions_mut();
+ if let Some(fields) = extensions.get_mut::<FormattedFields<N>>() {
+ let _ = self.fmt_fields.add_fields(fields, values);
+ return;
+ }
+
+ let mut fields = FormattedFields::<N>::new(String::new());
+ if self
+ .fmt_fields
+ .format_fields(fields.as_writer().with_ansi(self.is_ansi), values)
+ .is_ok()
+ {
+ fields.was_ansi = self.is_ansi;
+ extensions.insert(fields);
+ }
+ }
+
+ fn on_enter(&self, id: &Id, ctx: Context<'_, S>) {
+ if self.fmt_span.trace_enter() || self.fmt_span.trace_close() && self.fmt_span.fmt_timing {
+ let span = ctx.span(id).expect("Span not found, this is a bug");
+ let mut extensions = span.extensions_mut();
+ if let Some(timings) = extensions.get_mut::<Timings>() {
+ let now = Instant::now();
+ timings.idle += (now - timings.last).as_nanos() as u64;
+ timings.last = now;
+ }
+
+ if self.fmt_span.trace_enter() {
+ with_event_from_span!(id, span, "message" = "enter", |event| {
+ drop(extensions);
+ drop(span);
+ self.on_event(&event, ctx);
+ });
+ }
+ }
+ }
+
+ fn on_exit(&self, id: &Id, ctx: Context<'_, S>) {
+ if self.fmt_span.trace_exit() || self.fmt_span.trace_close() && self.fmt_span.fmt_timing {
+ let span = ctx.span(id).expect("Span not found, this is a bug");
+ let mut extensions = span.extensions_mut();
+ if let Some(timings) = extensions.get_mut::<Timings>() {
+ let now = Instant::now();
+ timings.busy += (now - timings.last).as_nanos() as u64;
+ timings.last = now;
+ }
+
+ if self.fmt_span.trace_exit() {
+ with_event_from_span!(id, span, "message" = "exit", |event| {
+ drop(extensions);
+ drop(span);
+ self.on_event(&event, ctx);
+ });
+ }
+ }
+ }
+
+ fn on_close(&self, id: Id, ctx: Context<'_, S>) {
+ if self.fmt_span.trace_close() {
+ let span = ctx.span(&id).expect("Span not found, this is a bug");
+ let extensions = span.extensions();
+ if let Some(timing) = extensions.get::<Timings>() {
+ let Timings {
+ busy,
+ mut idle,
+ last,
+ } = *timing;
+ idle += (Instant::now() - last).as_nanos() as u64;
+
+ let t_idle = field::display(TimingDisplay(idle));
+ let t_busy = field::display(TimingDisplay(busy));
+
+ with_event_from_span!(
+ id,
+ span,
+ "message" = "close",
+ "time.busy" = t_busy,
+ "time.idle" = t_idle,
+ |event| {
+ drop(extensions);
+ drop(span);
+ self.on_event(&event, ctx);
+ }
+ );
+ } else {
+ with_event_from_span!(id, span, "message" = "close", |event| {
+ drop(extensions);
+ drop(span);
+ self.on_event(&event, ctx);
+ });
+ }
+ }
+ }
+
+ fn on_event(&self, event: &Event<'_>, ctx: Context<'_, S>) {
+ thread_local! {
+ static BUF: RefCell<String> = RefCell::new(String::new());
+ }
+
+ BUF.with(|buf| {
+ let borrow = buf.try_borrow_mut();
+ let mut a;
+ let mut b;
+ let mut buf = match borrow {
+ Ok(buf) => {
+ a = buf;
+ &mut *a
+ }
+ _ => {
+ b = String::new();
+ &mut b
+ }
+ };
+
+ let ctx = self.make_ctx(ctx, event);
+ if self
+ .fmt_event
+ .format_event(
+ &ctx,
+ format::Writer::new(&mut buf).with_ansi(self.is_ansi),
+ event,
+ )
+ .is_ok()
+ {
+ let mut writer = self.make_writer.make_writer_for(event.metadata());
+ let _ = io::Write::write_all(&mut writer, buf.as_bytes());
+ }
+
+ buf.clear();
+ });
+ }
+
+ unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()> {
+ // This `downcast_raw` impl allows downcasting a `fmt` layer to any of
+ // its components (event formatter, field formatter, and `MakeWriter`)
+ // as well as to the layer's type itself. The potential use-cases for
+ // this *may* be somewhat niche, though...
+ match () {
+ _ if id == TypeId::of::<Self>() => Some(self as *const Self as *const ()),
+ _ if id == TypeId::of::<E>() => Some(&self.fmt_event as *const E as *const ()),
+ _ if id == TypeId::of::<N>() => Some(&self.fmt_fields as *const N as *const ()),
+ _ if id == TypeId::of::<W>() => Some(&self.make_writer as *const W as *const ()),
+ _ => None,
+ }
+ }
+}
+
+/// Provides the current span context to a formatter.
+pub struct FmtContext<'a, S, N> {
+ pub(crate) ctx: Context<'a, S>,
+ pub(crate) fmt_fields: &'a N,
+ pub(crate) event: &'a Event<'a>,
+}
+
+impl<'a, S, N> fmt::Debug for FmtContext<'a, S, N> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("FmtContext").finish()
+ }
+}
+
+impl<'cx, 'writer, S, N> FormatFields<'writer> for FmtContext<'cx, S, N>
+where
+ S: Subscriber + for<'lookup> LookupSpan<'lookup>,
+ N: FormatFields<'writer> + 'static,
+{
+ fn format_fields<R: RecordFields>(
+ &self,
+ writer: format::Writer<'writer>,
+ fields: R,
+ ) -> fmt::Result {
+ self.fmt_fields.format_fields(writer, fields)
+ }
+}
+
+impl<'a, S, N> FmtContext<'a, S, N>
+where
+ S: Subscriber + for<'lookup> LookupSpan<'lookup>,
+ N: for<'writer> FormatFields<'writer> + 'static,
+{
+ /// Visits every span in the current context with a closure.
+ ///
+ /// The provided closure will be called first with the current span,
+ /// and then with that span's parent, and then that span's parent,
+ /// and so on until a root span is reached.
+ pub fn visit_spans<E, F>(&self, mut f: F) -> Result<(), E>
+ where
+ F: FnMut(&SpanRef<'_, S>) -> Result<(), E>,
+ {
+ // visit all the current spans
+ if let Some(scope) = self.event_scope() {
+ for span in scope.from_root() {
+ f(&span)?;
+ }
+ }
+ Ok(())
+ }
+
+ /// Returns metadata for the span with the given `id`, if it exists.
+ ///
+ /// If this returns `None`, then no span exists for that ID (either it has
+ /// closed or the ID is invalid).
+ #[inline]
+ pub fn metadata(&self, id: &Id) -> Option<&'static Metadata<'static>>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ self.ctx.metadata(id)
+ }
+
+ /// Returns [stored data] for the span with the given `id`, if it exists.
+ ///
+ /// If this returns `None`, then no span exists for that ID (either it has
+ /// closed or the ID is invalid).
+ ///
+ /// [stored data]: ../registry/struct.SpanRef.html
+ #[inline]
+ pub fn span(&self, id: &Id) -> Option<SpanRef<'_, S>>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ self.ctx.span(id)
+ }
+
+ /// Returns `true` if an active span exists for the given `Id`.
+ #[inline]
+ pub fn exists(&self, id: &Id) -> bool
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ self.ctx.exists(id)
+ }
+
+ /// Returns [stored data] for the span that the wrapped subscriber considers
+ /// to be the current.
+ ///
+ /// If this returns `None`, then we are not currently within a span.
+ ///
+ /// [stored data]: ../registry/struct.SpanRef.html
+ #[inline]
+ pub fn lookup_current(&self) -> Option<SpanRef<'_, S>>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ self.ctx.lookup_current()
+ }
+
+ /// Returns the current span for this formatter.
+ pub fn current_span(&self) -> Current {
+ self.ctx.current_span()
+ }
+
+ /// Returns [stored data] for the parent span of the event currently being
+ /// formatted.
+ ///
+ /// If the event has a contextual parent, this will return the current span. If
+ /// the event has an explicit parent span, this will return that span. If
+ /// the event does not have a parent span, this will return `None`.
+ ///
+ /// [stored data]: SpanRef
+ pub fn parent_span(&self) -> Option<SpanRef<'_, S>> {
+ self.ctx.event_span(self.event)
+ }
+
+ /// Returns an iterator over the [stored data] for all the spans in the
+ /// current context, starting with the specified span and ending with the
+ /// root of the trace tree and ending with the current span.
+ ///
+ /// This is equivalent to the [`Context::span_scope`] method.
+ ///
+ /// <div class="information">
+ /// <div class="tooltip ignore" style="">ⓘ<span class="tooltiptext">Note</span></div>
+ /// </div>
+ /// <div class="example-wrap" style="display:inline-block">
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: Compared to <a href="#method.scope"><code>scope</code></a> this
+ /// returns the spans in reverse order (from leaf to root). Use
+ /// <a href="../registry/struct.Scope.html#method.from_root"><code>Scope::from_root</code></a>
+ /// in case root-to-leaf ordering is desired.
+ /// </pre></div>
+ ///
+ /// <div class="example-wrap" style="display:inline-block">
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: This requires the wrapped subscriber to implement the
+ /// <a href="../registry/trait.LookupSpan.html"><code>LookupSpan</code></a> trait.
+ /// See the documentation on <a href="./struct.Context.html"><code>Context</code>'s
+ /// declaration</a> for details.
+ /// </pre></div>
+ ///
+ /// [stored data]: crate::registry::SpanRef
+ pub fn span_scope(&self, id: &Id) -> Option<registry::Scope<'_, S>>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ self.ctx.span_scope(id)
+ }
+
+ /// Returns an iterator over the [stored data] for all the spans in the
+ /// event's span context, starting with its parent span and ending with the
+ /// root of the trace tree.
+ ///
+ /// This is equivalent to calling the [`Context::event_scope`] method and
+ /// passing the event currently being formatted.
+ ///
+ /// <div class="example-wrap" style="display:inline-block">
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: Compared to <a href="#method.scope"><code>scope</code></a> this
+ /// returns the spans in reverse order (from leaf to root). Use
+ /// <a href="../registry/struct.Scope.html#method.from_root"><code>Scope::from_root</code></a>
+ /// in case root-to-leaf ordering is desired.
+ /// </pre></div>
+ ///
+ /// <div class="example-wrap" style="display:inline-block">
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: This requires the wrapped subscriber to implement the
+ /// <a href="../registry/trait.LookupSpan.html"><code>LookupSpan</code></a> trait.
+ /// See the documentation on <a href="./struct.Context.html"><code>Context</code>'s
+ /// declaration</a> for details.
+ /// </pre></div>
+ ///
+ /// [stored data]: crate::registry::SpanRef
+ pub fn event_scope(&self) -> Option<registry::Scope<'_, S>>
+ where
+ S: for<'lookup> registry::LookupSpan<'lookup>,
+ {
+ self.ctx.event_scope(self.event)
+ }
+
+ /// Returns the [field formatter] configured by the subscriber invoking
+ /// `format_event`.
+ ///
+ /// The event formatter may use the returned field formatter to format the
+ /// fields of any events it records.
+ ///
+ /// [field formatter]: FormatFields
+ pub fn field_format(&self) -> &N {
+ self.fmt_fields
+ }
+}
+
+struct Timings {
+ idle: u64,
+ busy: u64,
+ last: Instant,
+}
+
+impl Timings {
+ fn new() -> Self {
+ Self {
+ idle: 0,
+ busy: 0,
+ last: Instant::now(),
+ }
+ }
+}
+
+#[cfg(test)]
+mod test {
+ use super::*;
+ use crate::fmt::{
+ self,
+ format::{self, test::MockTime, Format},
+ layer::Layer as _,
+ test::{MockMakeWriter, MockWriter},
+ time,
+ };
+ use crate::Registry;
+ use format::FmtSpan;
+ use regex::Regex;
+ use tracing::subscriber::with_default;
+ use tracing_core::dispatcher::Dispatch;
+
+ #[test]
+ fn impls() {
+ let f = Format::default().with_timer(time::Uptime::default());
+ let fmt = fmt::Layer::default().event_format(f);
+ let subscriber = fmt.with_subscriber(Registry::default());
+ let _dispatch = Dispatch::new(subscriber);
+
+ let f = format::Format::default();
+ let fmt = fmt::Layer::default().event_format(f);
+ let subscriber = fmt.with_subscriber(Registry::default());
+ let _dispatch = Dispatch::new(subscriber);
+
+ let f = format::Format::default().compact();
+ let fmt = fmt::Layer::default().event_format(f);
+ let subscriber = fmt.with_subscriber(Registry::default());
+ let _dispatch = Dispatch::new(subscriber);
+ }
+
+ #[test]
+ fn fmt_layer_downcasts() {
+ let f = format::Format::default();
+ let fmt = fmt::Layer::default().event_format(f);
+ let subscriber = fmt.with_subscriber(Registry::default());
+
+ let dispatch = Dispatch::new(subscriber);
+ assert!(dispatch.downcast_ref::<fmt::Layer<Registry>>().is_some());
+ }
+
+ #[test]
+ fn fmt_layer_downcasts_to_parts() {
+ let f = format::Format::default();
+ let fmt = fmt::Layer::default().event_format(f);
+ let subscriber = fmt.with_subscriber(Registry::default());
+ let dispatch = Dispatch::new(subscriber);
+ assert!(dispatch.downcast_ref::<format::DefaultFields>().is_some());
+ assert!(dispatch.downcast_ref::<format::Format>().is_some())
+ }
+
+ #[test]
+ fn is_lookup_span() {
+ fn assert_lookup_span<T: for<'a> crate::registry::LookupSpan<'a>>(_: T) {}
+ let fmt = fmt::Layer::default();
+ let subscriber = fmt.with_subscriber(Registry::default());
+ assert_lookup_span(subscriber)
+ }
+
+ fn sanitize_timings(s: String) -> String {
+ let re = Regex::new("time\\.(idle|busy)=([0-9.]+)[mµn]s").unwrap();
+ re.replace_all(s.as_str(), "timing").to_string()
+ }
+
+ #[test]
+ fn synthesize_span_none() {
+ let make_writer = MockMakeWriter::default();
+ let subscriber = crate::fmt::Subscriber::builder()
+ .with_writer(make_writer.clone())
+ .with_level(false)
+ .with_ansi(false)
+ .with_timer(MockTime)
+ // check that FmtSpan::NONE is the default
+ .finish();
+
+ with_default(subscriber, || {
+ let span1 = tracing::info_span!("span1", x = 42);
+ let _e = span1.enter();
+ });
+ let actual = sanitize_timings(make_writer.get_string());
+ assert_eq!("", actual.as_str());
+ }
+
+ #[test]
+ fn synthesize_span_active() {
+ let make_writer = MockMakeWriter::default();
+ let subscriber = crate::fmt::Subscriber::builder()
+ .with_writer(make_writer.clone())
+ .with_level(false)
+ .with_ansi(false)
+ .with_timer(MockTime)
+ .with_span_events(FmtSpan::ACTIVE)
+ .finish();
+
+ with_default(subscriber, || {
+ let span1 = tracing::info_span!("span1", x = 42);
+ let _e = span1.enter();
+ });
+ let actual = sanitize_timings(make_writer.get_string());
+ assert_eq!(
+ "fake time span1{x=42}: tracing_subscriber::fmt::fmt_layer::test: enter\n\
+ fake time span1{x=42}: tracing_subscriber::fmt::fmt_layer::test: exit\n",
+ actual.as_str()
+ );
+ }
+
+ #[test]
+ fn synthesize_span_close() {
+ let make_writer = MockMakeWriter::default();
+ let subscriber = crate::fmt::Subscriber::builder()
+ .with_writer(make_writer.clone())
+ .with_level(false)
+ .with_ansi(false)
+ .with_timer(MockTime)
+ .with_span_events(FmtSpan::CLOSE)
+ .finish();
+
+ with_default(subscriber, || {
+ let span1 = tracing::info_span!("span1", x = 42);
+ let _e = span1.enter();
+ });
+ let actual = sanitize_timings(make_writer.get_string());
+ assert_eq!(
+ "fake time span1{x=42}: tracing_subscriber::fmt::fmt_layer::test: close timing timing\n",
+ actual.as_str()
+ );
+ }
+
+ #[test]
+ fn synthesize_span_close_no_timing() {
+ let make_writer = MockMakeWriter::default();
+ let subscriber = crate::fmt::Subscriber::builder()
+ .with_writer(make_writer.clone())
+ .with_level(false)
+ .with_ansi(false)
+ .with_timer(MockTime)
+ .without_time()
+ .with_span_events(FmtSpan::CLOSE)
+ .finish();
+
+ with_default(subscriber, || {
+ let span1 = tracing::info_span!("span1", x = 42);
+ let _e = span1.enter();
+ });
+ let actual = sanitize_timings(make_writer.get_string());
+ assert_eq!(
+ "span1{x=42}: tracing_subscriber::fmt::fmt_layer::test: close\n",
+ actual.as_str()
+ );
+ }
+
+ #[test]
+ fn synthesize_span_full() {
+ let make_writer = MockMakeWriter::default();
+ let subscriber = crate::fmt::Subscriber::builder()
+ .with_writer(make_writer.clone())
+ .with_level(false)
+ .with_ansi(false)
+ .with_timer(MockTime)
+ .with_span_events(FmtSpan::FULL)
+ .finish();
+
+ with_default(subscriber, || {
+ let span1 = tracing::info_span!("span1", x = 42);
+ let _e = span1.enter();
+ });
+ let actual = sanitize_timings(make_writer.get_string());
+ assert_eq!(
+ "fake time span1{x=42}: tracing_subscriber::fmt::fmt_layer::test: new\n\
+ fake time span1{x=42}: tracing_subscriber::fmt::fmt_layer::test: enter\n\
+ fake time span1{x=42}: tracing_subscriber::fmt::fmt_layer::test: exit\n\
+ fake time span1{x=42}: tracing_subscriber::fmt::fmt_layer::test: close timing timing\n",
+ actual.as_str()
+ );
+ }
+
+ #[test]
+ fn make_writer_based_on_meta() {
+ struct MakeByTarget {
+ make_writer1: MockMakeWriter,
+ make_writer2: MockMakeWriter,
+ }
+
+ impl<'a> MakeWriter<'a> for MakeByTarget {
+ type Writer = MockWriter;
+
+ fn make_writer(&'a self) -> Self::Writer {
+ self.make_writer1.make_writer()
+ }
+
+ fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer {
+ if meta.target() == "writer2" {
+ return self.make_writer2.make_writer();
+ }
+ self.make_writer()
+ }
+ }
+
+ let make_writer1 = MockMakeWriter::default();
+ let make_writer2 = MockMakeWriter::default();
+
+ let make_writer = MakeByTarget {
+ make_writer1: make_writer1.clone(),
+ make_writer2: make_writer2.clone(),
+ };
+
+ let subscriber = crate::fmt::Subscriber::builder()
+ .with_writer(make_writer)
+ .with_level(false)
+ .with_target(false)
+ .with_ansi(false)
+ .with_timer(MockTime)
+ .with_span_events(FmtSpan::CLOSE)
+ .finish();
+
+ with_default(subscriber, || {
+ let span1 = tracing::info_span!("writer1_span", x = 42);
+ let _e = span1.enter();
+ tracing::info!(target: "writer2", "hello writer2!");
+ let span2 = tracing::info_span!(target: "writer2", "writer2_span");
+ let _e = span2.enter();
+ tracing::warn!(target: "writer1", "hello writer1!");
+ });
+
+ let actual = sanitize_timings(make_writer1.get_string());
+ assert_eq!(
+ "fake time writer1_span{x=42}:writer2_span: hello writer1!\n\
+ fake time writer1_span{x=42}: close timing timing\n",
+ actual.as_str()
+ );
+ let actual = sanitize_timings(make_writer2.get_string());
+ assert_eq!(
+ "fake time writer1_span{x=42}: hello writer2!\n\
+ fake time writer1_span{x=42}:writer2_span: close timing timing\n",
+ actual.as_str()
+ );
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/fmt/format/json.rs b/vendor/tracing-subscriber-0.3.3/src/fmt/format/json.rs
new file mode 100644
index 000000000..cc86f03c7
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/fmt/format/json.rs
@@ -0,0 +1,750 @@
+use super::{Format, FormatEvent, FormatFields, FormatTime, Writer};
+use crate::{
+ field::{RecordFields, VisitOutput},
+ fmt::{
+ fmt_layer::{FmtContext, FormattedFields},
+ writer::WriteAdaptor,
+ },
+ registry::LookupSpan,
+};
+use serde::ser::{SerializeMap, Serializer as _};
+use serde_json::Serializer;
+use std::{
+ collections::BTreeMap,
+ fmt::{self, Write},
+};
+use tracing_core::{
+ field::{self, Field},
+ span::Record,
+ Event, Subscriber,
+};
+use tracing_serde::AsSerde;
+
+#[cfg(feature = "tracing-log")]
+use tracing_log::NormalizeEvent;
+
+/// Marker for `Format` that indicates that the verbose JSON log format should be used.
+///
+/// The full format includes fields from all entered spans.
+///
+/// # Example Output
+///
+/// ```json
+/// {
+/// "timestamp":"Feb 20 11:28:15.096",
+/// "level":"INFO",
+/// "fields":{"message":"some message","key":"value"}
+/// "target":"mycrate",
+/// "span":{name":"leaf"},
+/// "spans":[{"name":"root"},{"name":"leaf"}],
+/// }
+/// ```
+///
+/// # Options
+///
+/// - [`Json::flatten_event`] can be used to enable flattening event fields into
+/// the root
+/// - [`Json::with_current_span`] can be used to control logging of the current
+/// span
+/// - [`Json::with_span_list`] can be used to control logging of the span list
+/// object.
+///
+/// By default, event fields are not flattened, and both current span and span
+/// list are logged.
+///
+/// [`Json::flatten_event`]: #method.flatten_event
+/// [`Json::with_current_span`]: #method.with_current_span
+/// [`Json::with_span_list`]: #method.with_span_list
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+pub struct Json {
+ pub(crate) flatten_event: bool,
+ pub(crate) display_current_span: bool,
+ pub(crate) display_span_list: bool,
+}
+
+impl Json {
+ /// If set to `true` event metadata will be flattened into the root object.
+ pub fn flatten_event(&mut self, flatten_event: bool) {
+ self.flatten_event = flatten_event;
+ }
+
+ /// If set to `false`, formatted events won't contain a field for the current span.
+ pub fn with_current_span(&mut self, display_current_span: bool) {
+ self.display_current_span = display_current_span;
+ }
+
+ /// If set to `false`, formatted events won't contain a list of all currently
+ /// entered spans. Spans are logged in a list from root to leaf.
+ pub fn with_span_list(&mut self, display_span_list: bool) {
+ self.display_span_list = display_span_list;
+ }
+}
+
+struct SerializableContext<'a, 'b, Span, N>(
+ &'b crate::layer::Context<'a, Span>,
+ std::marker::PhantomData<N>,
+)
+where
+ Span: Subscriber + for<'lookup> crate::registry::LookupSpan<'lookup>,
+ N: for<'writer> FormatFields<'writer> + 'static;
+
+impl<'a, 'b, Span, N> serde::ser::Serialize for SerializableContext<'a, 'b, Span, N>
+where
+ Span: Subscriber + for<'lookup> crate::registry::LookupSpan<'lookup>,
+ N: for<'writer> FormatFields<'writer> + 'static,
+{
+ fn serialize<Ser>(&self, serializer_o: Ser) -> Result<Ser::Ok, Ser::Error>
+ where
+ Ser: serde::ser::Serializer,
+ {
+ use serde::ser::SerializeSeq;
+ let mut serializer = serializer_o.serialize_seq(None)?;
+
+ if let Some(leaf_span) = self.0.lookup_current() {
+ for span in leaf_span.scope().from_root() {
+ serializer.serialize_element(&SerializableSpan(&span, self.1))?;
+ }
+ }
+
+ serializer.end()
+ }
+}
+
+struct SerializableSpan<'a, 'b, Span, N>(
+ &'b crate::registry::SpanRef<'a, Span>,
+ std::marker::PhantomData<N>,
+)
+where
+ Span: for<'lookup> crate::registry::LookupSpan<'lookup>,
+ N: for<'writer> FormatFields<'writer> + 'static;
+
+impl<'a, 'b, Span, N> serde::ser::Serialize for SerializableSpan<'a, 'b, Span, N>
+where
+ Span: for<'lookup> crate::registry::LookupSpan<'lookup>,
+ N: for<'writer> FormatFields<'writer> + 'static,
+{
+ fn serialize<Ser>(&self, serializer: Ser) -> Result<Ser::Ok, Ser::Error>
+ where
+ Ser: serde::ser::Serializer,
+ {
+ let mut serializer = serializer.serialize_map(None)?;
+
+ let ext = self.0.extensions();
+ let data = ext
+ .get::<FormattedFields<N>>()
+ .expect("Unable to find FormattedFields in extensions; this is a bug");
+
+ // TODO: let's _not_ do this, but this resolves
+ // https://github.com/tokio-rs/tracing/issues/391.
+ // We should probably rework this to use a `serde_json::Value` or something
+ // similar in a JSON-specific layer, but I'd (david)
+ // rather have a uglier fix now rather than shipping broken JSON.
+ match serde_json::from_str::<serde_json::Value>(data) {
+ Ok(serde_json::Value::Object(fields)) => {
+ for field in fields {
+ serializer.serialize_entry(&field.0, &field.1)?;
+ }
+ }
+ // We have fields for this span which are valid JSON but not an object.
+ // This is probably a bug, so panic if we're in debug mode
+ Ok(_) if cfg!(debug_assertions) => panic!(
+ "span '{}' had malformed fields! this is a bug.\n error: invalid JSON object\n fields: {:?}",
+ self.0.metadata().name(),
+ data
+ ),
+ // If we *aren't* in debug mode, it's probably best not to
+ // crash the program, let's log the field found but also an
+ // message saying it's type is invalid
+ Ok(value) => {
+ serializer.serialize_entry("field", &value)?;
+ serializer.serialize_entry("field_error", "field was no a valid object")?
+ }
+ // We have previously recorded fields for this span
+ // should be valid JSON. However, they appear to *not*
+ // be valid JSON. This is almost certainly a bug, so
+ // panic if we're in debug mode
+ Err(e) if cfg!(debug_assertions) => panic!(
+ "span '{}' had malformed fields! this is a bug.\n error: {}\n fields: {:?}",
+ self.0.metadata().name(),
+ e,
+ data
+ ),
+ // If we *aren't* in debug mode, it's probably best not
+ // crash the program, but let's at least make sure it's clear
+ // that the fields are not supposed to be missing.
+ Err(e) => serializer.serialize_entry("field_error", &format!("{}", e))?,
+ };
+ serializer.serialize_entry("name", self.0.metadata().name())?;
+ serializer.end()
+ }
+}
+
+impl<S, N, T> FormatEvent<S, N> for Format<Json, T>
+where
+ S: Subscriber + for<'lookup> LookupSpan<'lookup>,
+ N: for<'writer> FormatFields<'writer> + 'static,
+ T: FormatTime,
+{
+ fn format_event(
+ &self,
+ ctx: &FmtContext<'_, S, N>,
+ mut writer: Writer<'_>,
+ event: &Event<'_>,
+ ) -> fmt::Result
+ where
+ S: Subscriber + for<'a> LookupSpan<'a>,
+ {
+ let mut timestamp = String::new();
+ self.timer.format_time(&mut Writer::new(&mut timestamp))?;
+
+ #[cfg(feature = "tracing-log")]
+ let normalized_meta = event.normalized_metadata();
+ #[cfg(feature = "tracing-log")]
+ let meta = normalized_meta.as_ref().unwrap_or_else(|| event.metadata());
+ #[cfg(not(feature = "tracing-log"))]
+ let meta = event.metadata();
+
+ let mut visit = || {
+ let mut serializer = Serializer::new(WriteAdaptor::new(&mut writer));
+
+ let mut serializer = serializer.serialize_map(None)?;
+
+ if self.display_timestamp {
+ serializer.serialize_entry("timestamp", &timestamp)?;
+ }
+
+ if self.display_level {
+ serializer.serialize_entry("level", &meta.level().as_serde())?;
+ }
+
+ let format_field_marker: std::marker::PhantomData<N> = std::marker::PhantomData;
+
+ let current_span = if self.format.display_current_span || self.format.display_span_list
+ {
+ event
+ .parent()
+ .and_then(|id| ctx.span(id))
+ .or_else(|| ctx.lookup_current())
+ } else {
+ None
+ };
+
+ if self.format.flatten_event {
+ let mut visitor = tracing_serde::SerdeMapVisitor::new(serializer);
+ event.record(&mut visitor);
+
+ serializer = visitor.take_serializer()?;
+ } else {
+ use tracing_serde::fields::AsMap;
+ serializer.serialize_entry("fields", &event.field_map())?;
+ };
+
+ if self.display_target {
+ serializer.serialize_entry("target", meta.target())?;
+ }
+
+ if self.format.display_current_span {
+ if let Some(ref span) = current_span {
+ serializer
+ .serialize_entry("span", &SerializableSpan(span, format_field_marker))
+ .unwrap_or(());
+ }
+ }
+
+ if self.format.display_span_list && current_span.is_some() {
+ serializer.serialize_entry(
+ "spans",
+ &SerializableContext(&ctx.ctx, format_field_marker),
+ )?;
+ }
+
+ if self.display_thread_name {
+ let current_thread = std::thread::current();
+ match current_thread.name() {
+ Some(name) => {
+ serializer.serialize_entry("threadName", name)?;
+ }
+ // fall-back to thread id when name is absent and ids are not enabled
+ None if !self.display_thread_id => {
+ serializer
+ .serialize_entry("threadName", &format!("{:?}", current_thread.id()))?;
+ }
+ _ => {}
+ }
+ }
+
+ if self.display_thread_id {
+ serializer
+ .serialize_entry("threadId", &format!("{:?}", std::thread::current().id()))?;
+ }
+
+ serializer.end()
+ };
+
+ visit().map_err(|_| fmt::Error)?;
+ writeln!(writer)
+ }
+}
+
+impl Default for Json {
+ fn default() -> Json {
+ Json {
+ flatten_event: false,
+ display_current_span: true,
+ display_span_list: true,
+ }
+ }
+}
+
+/// The JSON [`FormatFields`] implementation.
+///
+/// [`FormatFields`]: trait.FormatFields.html
+#[derive(Debug)]
+pub struct JsonFields {
+ // reserve the ability to add fields to this without causing a breaking
+ // change in the future.
+ _private: (),
+}
+
+impl JsonFields {
+ /// Returns a new JSON [`FormatFields`] implementation.
+ ///
+ /// [`FormatFields`]: trait.FormatFields.html
+ pub fn new() -> Self {
+ Self { _private: () }
+ }
+}
+
+impl Default for JsonFields {
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
+impl<'a> FormatFields<'a> for JsonFields {
+ /// Format the provided `fields` to the provided `writer`, returning a result.
+ fn format_fields<R: RecordFields>(&self, mut writer: Writer<'_>, fields: R) -> fmt::Result {
+ let mut v = JsonVisitor::new(&mut writer);
+ fields.record(&mut v);
+ v.finish()
+ }
+
+ /// Record additional field(s) on an existing span.
+ ///
+ /// By default, this appends a space to the current set of fields if it is
+ /// non-empty, and then calls `self.format_fields`. If different behavior is
+ /// required, the default implementation of this method can be overridden.
+ fn add_fields(
+ &self,
+ current: &'a mut FormattedFields<Self>,
+ fields: &Record<'_>,
+ ) -> fmt::Result {
+ if current.is_empty() {
+ // If there are no previously recorded fields, we can just reuse the
+ // existing string.
+ let mut writer = current.as_writer();
+ let mut v = JsonVisitor::new(&mut writer);
+ fields.record(&mut v);
+ v.finish()?;
+ return Ok(());
+ }
+
+ // If fields were previously recorded on this span, we need to parse
+ // the current set of fields as JSON, add the new fields, and
+ // re-serialize them. Otherwise, if we just appended the new fields
+ // to a previously serialized JSON object, we would end up with
+ // malformed JSON.
+ //
+ // XXX(eliza): this is far from efficient, but unfortunately, it is
+ // necessary as long as the JSON formatter is implemented on top of
+ // an interface that stores all formatted fields as strings.
+ //
+ // We should consider reimplementing the JSON formatter as a
+ // separate layer, rather than a formatter for the `fmt` layer —
+ // then, we could store fields as JSON values, and add to them
+ // without having to parse and re-serialize.
+ let mut new = String::new();
+ let map: BTreeMap<&'_ str, serde_json::Value> =
+ serde_json::from_str(current).map_err(|_| fmt::Error)?;
+ let mut v = JsonVisitor::new(&mut new);
+ v.values = map;
+ fields.record(&mut v);
+ v.finish()?;
+ current.fields = new;
+
+ Ok(())
+ }
+}
+
+/// The [visitor] produced by [`JsonFields`]'s [`MakeVisitor`] implementation.
+///
+/// [visitor]: ../../field/trait.Visit.html
+/// [`JsonFields`]: struct.JsonFields.html
+/// [`MakeVisitor`]: ../../field/trait.MakeVisitor.html
+pub struct JsonVisitor<'a> {
+ values: BTreeMap<&'a str, serde_json::Value>,
+ writer: &'a mut dyn Write,
+}
+
+impl<'a> fmt::Debug for JsonVisitor<'a> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_fmt(format_args!("JsonVisitor {{ values: {:?} }}", self.values))
+ }
+}
+
+impl<'a> JsonVisitor<'a> {
+ /// Returns a new default visitor that formats to the provided `writer`.
+ ///
+ /// # Arguments
+ /// - `writer`: the writer to format to.
+ /// - `is_empty`: whether or not any fields have been previously written to
+ /// that writer.
+ pub fn new(writer: &'a mut dyn Write) -> Self {
+ Self {
+ values: BTreeMap::new(),
+ writer,
+ }
+ }
+}
+
+impl<'a> crate::field::VisitFmt for JsonVisitor<'a> {
+ fn writer(&mut self) -> &mut dyn fmt::Write {
+ self.writer
+ }
+}
+
+impl<'a> crate::field::VisitOutput<fmt::Result> for JsonVisitor<'a> {
+ fn finish(self) -> fmt::Result {
+ let inner = || {
+ let mut serializer = Serializer::new(WriteAdaptor::new(self.writer));
+ let mut ser_map = serializer.serialize_map(None)?;
+
+ for (k, v) in self.values {
+ ser_map.serialize_entry(k, &v)?;
+ }
+
+ ser_map.end()
+ };
+
+ if inner().is_err() {
+ Err(fmt::Error)
+ } else {
+ Ok(())
+ }
+ }
+}
+
+impl<'a> field::Visit for JsonVisitor<'a> {
+ /// Visit a double precision floating point value.
+ fn record_f64(&mut self, field: &Field, value: f64) {
+ self.values
+ .insert(field.name(), serde_json::Value::from(value));
+ }
+
+ /// Visit a signed 64-bit integer value.
+ fn record_i64(&mut self, field: &Field, value: i64) {
+ self.values
+ .insert(field.name(), serde_json::Value::from(value));
+ }
+
+ /// Visit an unsigned 64-bit integer value.
+ fn record_u64(&mut self, field: &Field, value: u64) {
+ self.values
+ .insert(field.name(), serde_json::Value::from(value));
+ }
+
+ /// Visit a boolean value.
+ fn record_bool(&mut self, field: &Field, value: bool) {
+ self.values
+ .insert(field.name(), serde_json::Value::from(value));
+ }
+
+ /// Visit a string value.
+ fn record_str(&mut self, field: &Field, value: &str) {
+ self.values
+ .insert(field.name(), serde_json::Value::from(value));
+ }
+
+ fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
+ match field.name() {
+ // Skip fields that are actually log metadata that have already been handled
+ #[cfg(feature = "tracing-log")]
+ name if name.starts_with("log.") => (),
+ name if name.starts_with("r#") => {
+ self.values
+ .insert(&name[2..], serde_json::Value::from(format!("{:?}", value)));
+ }
+ name => {
+ self.values
+ .insert(name, serde_json::Value::from(format!("{:?}", value)));
+ }
+ };
+ }
+}
+#[cfg(test)]
+mod test {
+ use super::*;
+ use crate::fmt::{format::FmtSpan, test::MockMakeWriter, time::FormatTime, SubscriberBuilder};
+ use tracing::{self, subscriber::with_default};
+
+ use std::fmt;
+
+ struct MockTime;
+ impl FormatTime for MockTime {
+ fn format_time(&self, w: &mut Writer<'_>) -> fmt::Result {
+ write!(w, "fake time")
+ }
+ }
+
+ fn subscriber() -> SubscriberBuilder<JsonFields, Format<Json>> {
+ SubscriberBuilder::default().json()
+ }
+
+ #[test]
+ fn json() {
+ let expected =
+ "{\"timestamp\":\"fake time\",\"level\":\"INFO\",\"span\":{\"answer\":42,\"name\":\"json_span\",\"number\":3},\"spans\":[{\"answer\":42,\"name\":\"json_span\",\"number\":3}],\"target\":\"tracing_subscriber::fmt::format::json::test\",\"fields\":{\"message\":\"some json test\"}}\n";
+ let subscriber = subscriber()
+ .flatten_event(false)
+ .with_current_span(true)
+ .with_span_list(true);
+ test_json(expected, subscriber, || {
+ let span = tracing::span!(tracing::Level::INFO, "json_span", answer = 42, number = 3);
+ let _guard = span.enter();
+ tracing::info!("some json test");
+ });
+ }
+
+ #[test]
+ fn json_flattened_event() {
+ let expected =
+ "{\"timestamp\":\"fake time\",\"level\":\"INFO\",\"span\":{\"answer\":42,\"name\":\"json_span\",\"number\":3},\"spans\":[{\"answer\":42,\"name\":\"json_span\",\"number\":3}],\"target\":\"tracing_subscriber::fmt::format::json::test\",\"message\":\"some json test\"}\n";
+
+ let subscriber = subscriber()
+ .flatten_event(true)
+ .with_current_span(true)
+ .with_span_list(true);
+ test_json(expected, subscriber, || {
+ let span = tracing::span!(tracing::Level::INFO, "json_span", answer = 42, number = 3);
+ let _guard = span.enter();
+ tracing::info!("some json test");
+ });
+ }
+
+ #[test]
+ fn json_disabled_current_span_event() {
+ let expected =
+ "{\"timestamp\":\"fake time\",\"level\":\"INFO\",\"spans\":[{\"answer\":42,\"name\":\"json_span\",\"number\":3}],\"target\":\"tracing_subscriber::fmt::format::json::test\",\"fields\":{\"message\":\"some json test\"}}\n";
+ let subscriber = subscriber()
+ .flatten_event(false)
+ .with_current_span(false)
+ .with_span_list(true);
+ test_json(expected, subscriber, || {
+ let span = tracing::span!(tracing::Level::INFO, "json_span", answer = 42, number = 3);
+ let _guard = span.enter();
+ tracing::info!("some json test");
+ });
+ }
+
+ #[test]
+ fn json_disabled_span_list_event() {
+ let expected =
+ "{\"timestamp\":\"fake time\",\"level\":\"INFO\",\"span\":{\"answer\":42,\"name\":\"json_span\",\"number\":3},\"target\":\"tracing_subscriber::fmt::format::json::test\",\"fields\":{\"message\":\"some json test\"}}\n";
+ let subscriber = subscriber()
+ .flatten_event(false)
+ .with_current_span(true)
+ .with_span_list(false);
+ test_json(expected, subscriber, || {
+ let span = tracing::span!(tracing::Level::INFO, "json_span", answer = 42, number = 3);
+ let _guard = span.enter();
+ tracing::info!("some json test");
+ });
+ }
+
+ #[test]
+ fn json_nested_span() {
+ let expected =
+ "{\"timestamp\":\"fake time\",\"level\":\"INFO\",\"span\":{\"answer\":43,\"name\":\"nested_json_span\",\"number\":4},\"spans\":[{\"answer\":42,\"name\":\"json_span\",\"number\":3},{\"answer\":43,\"name\":\"nested_json_span\",\"number\":4}],\"target\":\"tracing_subscriber::fmt::format::json::test\",\"fields\":{\"message\":\"some json test\"}}\n";
+ let subscriber = subscriber()
+ .flatten_event(false)
+ .with_current_span(true)
+ .with_span_list(true);
+ test_json(expected, subscriber, || {
+ let span = tracing::span!(tracing::Level::INFO, "json_span", answer = 42, number = 3);
+ let _guard = span.enter();
+ let span = tracing::span!(
+ tracing::Level::INFO,
+ "nested_json_span",
+ answer = 43,
+ number = 4
+ );
+ let _guard = span.enter();
+ tracing::info!("some json test");
+ });
+ }
+
+ #[test]
+ fn json_no_span() {
+ let expected =
+ "{\"timestamp\":\"fake time\",\"level\":\"INFO\",\"target\":\"tracing_subscriber::fmt::format::json::test\",\"fields\":{\"message\":\"some json test\"}}\n";
+ let subscriber = subscriber()
+ .flatten_event(false)
+ .with_current_span(true)
+ .with_span_list(true);
+ test_json(expected, subscriber, || {
+ tracing::info!("some json test");
+ });
+ }
+
+ #[test]
+ fn record_works() {
+ // This test reproduces issue #707, where using `Span::record` causes
+ // any events inside the span to be ignored.
+
+ let make_writer = MockMakeWriter::default();
+ let subscriber = crate::fmt()
+ .json()
+ .with_writer(make_writer.clone())
+ .finish();
+
+ with_default(subscriber, || {
+ tracing::info!("an event outside the root span");
+ assert_eq!(
+ parse_as_json(&make_writer)["fields"]["message"],
+ "an event outside the root span"
+ );
+
+ let span = tracing::info_span!("the span", na = tracing::field::Empty);
+ span.record("na", &"value");
+ let _enter = span.enter();
+
+ tracing::info!("an event inside the root span");
+ assert_eq!(
+ parse_as_json(&make_writer)["fields"]["message"],
+ "an event inside the root span"
+ );
+ });
+ }
+
+ #[test]
+ fn json_span_event_show_correct_context() {
+ let buffer = MockMakeWriter::default();
+ let subscriber = subscriber()
+ .with_writer(buffer.clone())
+ .flatten_event(false)
+ .with_current_span(true)
+ .with_span_list(false)
+ .with_span_events(FmtSpan::FULL)
+ .finish();
+
+ with_default(subscriber, || {
+ let context = "parent";
+ let parent_span = tracing::info_span!("parent_span", context);
+
+ let event = parse_as_json(&buffer);
+ assert_eq!(event["fields"]["message"], "new");
+ assert_eq!(event["span"]["context"], "parent");
+
+ let _parent_enter = parent_span.enter();
+ let event = parse_as_json(&buffer);
+ assert_eq!(event["fields"]["message"], "enter");
+ assert_eq!(event["span"]["context"], "parent");
+
+ let context = "child";
+ let child_span = tracing::info_span!("child_span", context);
+ let event = parse_as_json(&buffer);
+ assert_eq!(event["fields"]["message"], "new");
+ assert_eq!(event["span"]["context"], "child");
+
+ let _child_enter = child_span.enter();
+ let event = parse_as_json(&buffer);
+ assert_eq!(event["fields"]["message"], "enter");
+ assert_eq!(event["span"]["context"], "child");
+
+ drop(_child_enter);
+ let event = parse_as_json(&buffer);
+ assert_eq!(event["fields"]["message"], "exit");
+ assert_eq!(event["span"]["context"], "child");
+
+ drop(child_span);
+ let event = parse_as_json(&buffer);
+ assert_eq!(event["fields"]["message"], "close");
+ assert_eq!(event["span"]["context"], "child");
+
+ drop(_parent_enter);
+ let event = parse_as_json(&buffer);
+ assert_eq!(event["fields"]["message"], "exit");
+ assert_eq!(event["span"]["context"], "parent");
+
+ drop(parent_span);
+ let event = parse_as_json(&buffer);
+ assert_eq!(event["fields"]["message"], "close");
+ assert_eq!(event["span"]["context"], "parent");
+ });
+ }
+
+ #[test]
+ fn json_span_event_with_no_fields() {
+ // Check span events serialize correctly.
+ // Discussion: https://github.com/tokio-rs/tracing/issues/829#issuecomment-661984255
+ let buffer = MockMakeWriter::default();
+ let subscriber = subscriber()
+ .with_writer(buffer.clone())
+ .flatten_event(false)
+ .with_current_span(false)
+ .with_span_list(false)
+ .with_span_events(FmtSpan::FULL)
+ .finish();
+
+ with_default(subscriber, || {
+ let span = tracing::info_span!("valid_json");
+ assert_eq!(parse_as_json(&buffer)["fields"]["message"], "new");
+
+ let _enter = span.enter();
+ assert_eq!(parse_as_json(&buffer)["fields"]["message"], "enter");
+
+ drop(_enter);
+ assert_eq!(parse_as_json(&buffer)["fields"]["message"], "exit");
+
+ drop(span);
+ assert_eq!(parse_as_json(&buffer)["fields"]["message"], "close");
+ });
+ }
+
+ fn parse_as_json(buffer: &MockMakeWriter) -> serde_json::Value {
+ let buf = String::from_utf8(buffer.buf().to_vec()).unwrap();
+ let json = buf
+ .lines()
+ .last()
+ .expect("expected at least one line to be written!");
+ match serde_json::from_str(json) {
+ Ok(v) => v,
+ Err(e) => panic!(
+ "assertion failed: JSON shouldn't be malformed\n error: {}\n json: {}",
+ e, json
+ ),
+ }
+ }
+
+ fn test_json<T>(
+ expected: &str,
+ builder: crate::fmt::SubscriberBuilder<JsonFields, Format<Json>>,
+ producer: impl FnOnce() -> T,
+ ) {
+ let make_writer = MockMakeWriter::default();
+ let subscriber = builder
+ .with_writer(make_writer.clone())
+ .with_timer(MockTime)
+ .finish();
+
+ with_default(subscriber, producer);
+
+ let buf = make_writer.buf();
+ let actual = std::str::from_utf8(&buf[..]).unwrap();
+ assert_eq!(
+ serde_json::from_str::<std::collections::HashMap<&str, serde_json::Value>>(expected)
+ .unwrap(),
+ serde_json::from_str(actual).unwrap()
+ );
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/fmt/format/mod.rs b/vendor/tracing-subscriber-0.3.3/src/fmt/format/mod.rs
new file mode 100644
index 000000000..9001e102e
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/fmt/format/mod.rs
@@ -0,0 +1,1798 @@
+//! Formatters for logging `tracing` events.
+use super::time::{FormatTime, SystemTime};
+use crate::{
+ field::{MakeOutput, MakeVisitor, RecordFields, VisitFmt, VisitOutput},
+ fmt::fmt_layer::FmtContext,
+ fmt::fmt_layer::FormattedFields,
+ registry::LookupSpan,
+};
+
+use std::fmt::{self, Debug, Display, Write};
+use tracing_core::{
+ field::{self, Field, Visit},
+ span, Event, Level, Subscriber,
+};
+
+#[cfg(feature = "tracing-log")]
+use tracing_log::NormalizeEvent;
+
+#[cfg(feature = "ansi")]
+use ansi_term::{Colour, Style};
+
+#[cfg(feature = "json")]
+mod json;
+#[cfg(feature = "json")]
+#[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+pub use json::*;
+
+#[cfg(feature = "ansi")]
+mod pretty;
+#[cfg(feature = "ansi")]
+#[cfg_attr(docsrs, doc(cfg(feature = "ansi")))]
+pub use pretty::*;
+
+/// A type that can format a tracing [`Event`] to a [`Writer`].
+///
+/// `FormatEvent` is primarily used in the context of [`fmt::Subscriber`] or
+/// [`fmt::Layer`]. Each time an event is dispatched to [`fmt::Subscriber`] or
+/// [`fmt::Layer`], the subscriber or layer
+/// forwards it to its associated `FormatEvent` to emit a log message.
+///
+/// This trait is already implemented for function pointers with the same
+/// signature as `format_event`.
+///
+/// # Arguments
+///
+/// The following arguments are passed to `FormatEvent::format_event`:
+///
+/// * A [`FmtContext`]. This is an extension of the [`layer::Context`] type,
+/// which can be used for accessing stored information such as the current
+/// span context an event occurred in.
+///
+/// In addition, [`FmtContext`] exposes access to the [`FormatFields`]
+/// implementation that the subscriber was configured to use via the
+/// [`FmtContext::field_format`] method. This can be used when the
+/// [`FormatEvent`] implementation needs to format the event's fields.
+///
+/// For convenience, [`FmtContext`] also [implements `FormatFields`],
+/// forwarding to the configured [`FormatFields`] type.
+///
+/// * A [`Writer`] to which the formatted representation of the event is
+/// written. This type implements the [`std::fmt::Write`] trait, and therefore
+/// can be used with the [`std::write!`] and [`std::writeln!`] macros, as well
+/// as calling [`std::fmt::Write`] methods directly.
+///
+/// The [`Writer`] type also implements additional methods that provide
+/// information about how the event should be formatted. The
+/// [`Writer::has_ansi_escapes`] method indicates whether [ANSI terminal
+/// escape codes] are supported by the underlying I/O writer that the event
+/// will be written to. If this returns `true`, the formatter is permitted to
+/// use ANSI escape codes to add colors and other text formatting to its
+/// output. If it returns `false`, the event will be written to an output that
+/// does not support ANSI escape codes (such as a log file), and they should
+/// not be emitted.
+///
+/// Crates like [`ansi_term`] and [`owo-colors`] can be used to add ANSI
+/// escape codes to formatted output.
+///
+/// * The actual [`Event`] to be formatted.
+///
+/// # Examples
+///
+/// This example re-implements a simiplified version of this crate's [default
+/// formatter]:
+///
+/// ```rust
+/// use std::fmt;
+/// use tracing_core::{Subscriber, Event};
+/// use tracing_subscriber::fmt::{
+/// format::{self, FormatEvent, FormatFields},
+/// FmtContext,
+/// FormattedFields,
+/// };
+/// use tracing_subscriber::registry::LookupSpan;
+///
+/// struct MyFormatter;
+///
+/// impl<S, N> FormatEvent<S, N> for MyFormatter
+/// where
+/// S: Subscriber + for<'a> LookupSpan<'a>,
+/// N: for<'a> FormatFields<'a> + 'static,
+/// {
+/// fn format_event(
+/// &self,
+/// ctx: &FmtContext<'_, S, N>,
+/// mut writer: format::Writer<'_>,
+/// event: &Event<'_>,
+/// ) -> fmt::Result {
+/// // Format values from the event's's metadata:
+/// let metadata = event.metadata();
+/// write!(&mut writer, "{} {}: ", metadata.level(), metadata.target())?;
+///
+/// // Format all the spans in the event's span context.
+/// if let Some(scope) = ctx.event_scope() {
+/// for span in scope.from_root() {
+/// write!(writer, "{}", span.name())?;
+///
+/// // `FormattedFields` is a formatted representation of the span's
+/// // fields, which is stored in its extensions by the `fmt` layer's
+/// // `new_span` method. The fields will have been formatted
+/// // by the same field formatter that's provided to the event
+/// // formatter in the `FmtContext`.
+/// let ext = span.extensions();
+/// let fields = &ext
+/// .get::<FormattedFields<N>>()
+/// .expect("will never be `None`");
+///
+/// // Skip formatting the fields if the span had no fields.
+/// if !fields.is_empty() {
+/// write!(writer, "{{{}}}", fields)?;
+/// }
+/// write!(writer, ": ")?;
+/// }
+/// }
+///
+/// // Write fields on the event
+/// ctx.field_format().format_fields(writer.by_ref(), event)?;
+///
+/// writeln!(writer)
+/// }
+/// }
+///
+/// let _subscriber = tracing_subscriber::fmt()
+/// .event_format(MyFormatter)
+/// .init();
+///
+/// let _span = tracing::info_span!("my_span", answer = 42).entered();
+/// tracing::info!(question = "life, the universe, and everything", "hello world");
+/// ```
+///
+/// This formatter will print events like this:
+///
+/// ```text
+/// DEBUG yak_shaving::shaver: some-span{field-on-span=foo}: started shaving yak
+/// ```
+///
+/// [`fmt::Layer`]: super::Layer
+/// [`fmt::Subscriber`]: super::Subscriber
+/// [`Event`]: tracing::Event
+/// [implements `FormatFields`]: super::FmtContext#impl-FormatFields<'writer>
+/// [ANSI terminal escape codes]: https://en.wikipedia.org/wiki/ANSI_escape_code
+/// [`Writer::has_ansi_escapes`]: Writer::has_ansi_escapes
+/// [`ansi_term`]: https://crates.io/crates/ansi_term
+/// [`owo-colors`]: https://crates.io/crates/owo-colors
+/// [default formatter]: Full
+pub trait FormatEvent<S, N>
+where
+ S: Subscriber + for<'a> LookupSpan<'a>,
+ N: for<'a> FormatFields<'a> + 'static,
+{
+ /// Write a log message for `Event` in `Context` to the given [`Writer`].
+ fn format_event(
+ &self,
+ ctx: &FmtContext<'_, S, N>,
+ writer: Writer<'_>,
+ event: &Event<'_>,
+ ) -> fmt::Result;
+}
+
+impl<S, N> FormatEvent<S, N>
+ for fn(ctx: &FmtContext<'_, S, N>, Writer<'_>, &Event<'_>) -> fmt::Result
+where
+ S: Subscriber + for<'a> LookupSpan<'a>,
+ N: for<'a> FormatFields<'a> + 'static,
+{
+ fn format_event(
+ &self,
+ ctx: &FmtContext<'_, S, N>,
+ writer: Writer<'_>,
+ event: &Event<'_>,
+ ) -> fmt::Result {
+ (*self)(ctx, writer, event)
+ }
+}
+/// A type that can format a [set of fields] to a [`Writer`].
+///
+/// `FormatFields` is primarily used in the context of [`FmtSubscriber`]. Each
+/// time a span or event with fields is recorded, the subscriber will format
+/// those fields with its associated `FormatFields` implementation.
+///
+/// [set of fields]: ../field/trait.RecordFields.html
+/// [`FmtSubscriber`]: ../fmt/struct.Subscriber.html
+pub trait FormatFields<'writer> {
+ /// Format the provided `fields` to the provided [`Writer`], returning a result.
+ fn format_fields<R: RecordFields>(&self, writer: Writer<'writer>, fields: R) -> fmt::Result;
+
+ /// Record additional field(s) on an existing span.
+ ///
+ /// By default, this appends a space to the current set of fields if it is
+ /// non-empty, and then calls `self.format_fields`. If different behavior is
+ /// required, the default implementation of this method can be overridden.
+ fn add_fields(
+ &self,
+ current: &'writer mut FormattedFields<Self>,
+ fields: &span::Record<'_>,
+ ) -> fmt::Result {
+ if !current.fields.is_empty() {
+ current.fields.push(' ');
+ }
+ self.format_fields(current.as_writer(), fields)
+ }
+}
+
+/// Returns the default configuration for an [event formatter].
+///
+/// Methods on the returned event formatter can be used for further
+/// configuration. For example:
+///
+/// ```rust
+/// let format = tracing_subscriber::fmt::format()
+/// .without_time() // Don't include timestamps
+/// .with_target(false) // Don't include event targets.
+/// .with_level(false) // Don't include event levels.
+/// .compact(); // Use a more compact, abbreviated format.
+///
+/// // Use the configured formatter when building a new subscriber.
+/// tracing_subscriber::fmt()
+/// .event_format(format)
+/// .init();
+/// ```
+pub fn format() -> Format {
+ Format::default()
+}
+
+/// Returns the default configuration for a JSON [event formatter].
+#[cfg(feature = "json")]
+#[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+pub fn json() -> Format<Json> {
+ format().json()
+}
+
+/// Returns a [`FormatFields`] implementation that formats fields using the
+/// provided function or closure.
+///
+/// [`FormatFields`]: trait.FormatFields.html
+pub fn debug_fn<F>(f: F) -> FieldFn<F>
+where
+ F: Fn(&mut Writer<'_>, &Field, &dyn fmt::Debug) -> fmt::Result + Clone,
+{
+ FieldFn(f)
+}
+
+/// A writer to which formatted representations of spans and events are written.
+///
+/// This type is provided as input to the [`FormatEvent::format_event`] and
+/// [`FormatFields::format_fields`] methods, which will write formatted
+/// representations of [`Event`]s and [fields] to the `Writer`.
+///
+/// This type implements the [`std::fmt::Write`] trait, allowing it to be used
+/// with any function that takes an instance of [`std::fmt::Write`].
+/// Additionally, it can be used with the standard library's [`std::write!`] and
+/// [`std::writeln!`] macros.
+///
+/// Additionally, a `Writer` may expose additional `tracing`-specific
+/// information to the formatter implementation.
+pub struct Writer<'writer> {
+ writer: &'writer mut dyn fmt::Write,
+ // TODO(eliza): add ANSI support
+ is_ansi: bool,
+}
+
+/// A [`FormatFields`] implementation that formats fields by calling a function
+/// or closure.
+///
+/// [`FormatFields`]: trait.FormatFields.html
+#[derive(Debug, Clone)]
+pub struct FieldFn<F>(F);
+/// The [visitor] produced by [`FieldFn`]'s [`MakeVisitor`] implementation.
+///
+/// [visitor]: ../../field/trait.Visit.html
+/// [`FieldFn`]: struct.FieldFn.html
+/// [`MakeVisitor`]: ../../field/trait.MakeVisitor.html
+pub struct FieldFnVisitor<'a, F> {
+ f: F,
+ writer: Writer<'a>,
+ result: fmt::Result,
+}
+/// Marker for `Format` that indicates that the compact log format should be used.
+///
+/// The compact format only includes the fields from the most recently entered span.
+#[derive(Default, Debug, Copy, Clone, Eq, PartialEq)]
+pub struct Compact;
+
+/// Marker for `Format` that indicates that the verbose log format should be used.
+///
+/// The full format includes fields from all entered spans.
+#[derive(Default, Debug, Copy, Clone, Eq, PartialEq)]
+pub struct Full;
+
+/// A pre-configured event formatter.
+///
+/// You will usually want to use this as the `FormatEvent` for a `FmtSubscriber`.
+///
+/// The default logging format, [`Full`] includes all fields in each event and its containing
+/// spans. The [`Compact`] logging format includes only the fields from the most-recently-entered
+/// span.
+#[derive(Debug, Clone)]
+pub struct Format<F = Full, T = SystemTime> {
+ format: F,
+ pub(crate) timer: T,
+ pub(crate) ansi: Option<bool>,
+ pub(crate) display_timestamp: bool,
+ pub(crate) display_target: bool,
+ pub(crate) display_level: bool,
+ pub(crate) display_thread_id: bool,
+ pub(crate) display_thread_name: bool,
+}
+
+// === impl Writer ===
+
+impl<'writer> Writer<'writer> {
+ // TODO(eliza): consider making this a public API?
+ // We may not want to do that if we choose to expose specialized
+ // constructors instead (e.g. `from_string` that stores whether the string
+ // is empty...?)
+ pub(crate) fn new(writer: &'writer mut impl fmt::Write) -> Self {
+ Self {
+ writer: writer as &mut dyn fmt::Write,
+ is_ansi: false,
+ }
+ }
+
+ // TODO(eliza): consider making this a public API?
+ pub(crate) fn with_ansi(self, is_ansi: bool) -> Self {
+ Self { is_ansi, ..self }
+ }
+
+ /// Return a new `Writer` that mutably borrows `self`.
+ ///
+ /// This can be used to temporarily borrow a `Writer` to pass a new `Writer`
+ /// to a function that takes a `Writer` by value, allowing the original writer
+ /// to still be used once that function returns.
+ pub fn by_ref(&mut self) -> Writer<'_> {
+ let is_ansi = self.is_ansi;
+ Writer {
+ writer: self as &mut dyn fmt::Write,
+ is_ansi,
+ }
+ }
+
+ /// Writes a string slice into this `Writer`, returning whether the write succeeded.
+ ///
+ /// This method can only succeed if the entire string slice was successfully
+ /// written, and this method will not return until all data has been written
+ /// or an error occurs.
+ ///
+ /// This is identical to calling the [`write_str` method] from the `Writer`'s
+ /// [`std::fmt::Write`] implementation. However, it is also provided as an
+ /// inherent method, so that `Writer`s can be used without needing to import the
+ /// [`std::fmt::Write`] trait.
+ ///
+ /// # Errors
+ ///
+ /// This function will return an instance of [`std::fmt::Error`] on error.
+ ///
+ /// [`write_str` method]: std::fmt::Write::write_str
+ #[inline]
+ pub fn write_str(&mut self, s: &str) -> fmt::Result {
+ self.writer.write_str(s)
+ }
+
+ /// Writes a [`char`] into this writer, returning whether the write succeeded.
+ ///
+ /// A single [`char`] may be encoded as more than one byte.
+ /// This method can only succeed if the entire byte sequence was successfully
+ /// written, and this method will not return until all data has been
+ /// written or an error occurs.
+ ///
+ /// This is identical to calling the [`write_char` method] from the `Writer`'s
+ /// [`std::fmt::Write`] implementation. However, it is also provided as an
+ /// inherent method, so that `Writer`s can be used without needing to import the
+ /// [`std::fmt::Write`] trait.
+ ///
+ /// # Errors
+ ///
+ /// This function will return an instance of [`std::fmt::Error`] on error.
+ ///
+ /// [`write_char` method]: std::fmt::Write::write_char
+ #[inline]
+ pub fn write_char(&mut self, c: char) -> fmt::Result {
+ self.writer.write_char(c)
+ }
+
+ /// Glue for usage of the [`write!`] macro with `Writer`s.
+ ///
+ /// This method should generally not be invoked manually, but rather through
+ /// the [`write!`] macro itself.
+ ///
+ /// This is identical to calling the [`write_fmt` method] from the `Writer`'s
+ /// [`std::fmt::Write`] implementation. However, it is also provided as an
+ /// inherent method, so that `Writer`s can be used with the [`write!` macro]
+ /// without needing to import the
+ /// [`std::fmt::Write`] trait.
+ ///
+ /// [`write_fmt` method]: std::fmt::Write::write_fmt
+ pub fn write_fmt(&mut self, args: fmt::Arguments<'_>) -> fmt::Result {
+ self.writer.write_fmt(args)
+ }
+
+ /// Returns `true` if [ANSI escape codes] may be used to add colors
+ /// and other formatting when writing to this `Writer`.
+ ///
+ /// If this returns `false`, formatters should not emit ANSI escape codes.
+ ///
+ /// [ANSI escape codes]: https://en.wikipedia.org/wiki/ANSI_escape_code
+ pub fn has_ansi_escapes(&self) -> bool {
+ self.is_ansi
+ }
+
+ pub(in crate::fmt::format) fn bold(&self) -> Style {
+ #[cfg(feature = "ansi")]
+ {
+ if self.is_ansi {
+ return Style::new().bold();
+ }
+ }
+
+ Style::new()
+ }
+
+ pub(in crate::fmt::format) fn dimmed(&self) -> Style {
+ #[cfg(feature = "ansi")]
+ {
+ if self.is_ansi {
+ return Style::new().dimmed();
+ }
+ }
+
+ Style::new()
+ }
+
+ pub(in crate::fmt::format) fn italic(&self) -> Style {
+ #[cfg(feature = "ansi")]
+ {
+ if self.is_ansi {
+ return Style::new().italic();
+ }
+ }
+
+ Style::new()
+ }
+}
+
+impl fmt::Write for Writer<'_> {
+ #[inline]
+ fn write_str(&mut self, s: &str) -> fmt::Result {
+ Writer::write_str(self, s)
+ }
+
+ #[inline]
+ fn write_char(&mut self, c: char) -> fmt::Result {
+ Writer::write_char(self, c)
+ }
+
+ #[inline]
+ fn write_fmt(&mut self, args: fmt::Arguments<'_>) -> fmt::Result {
+ Writer::write_fmt(self, args)
+ }
+}
+
+impl fmt::Debug for Writer<'_> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Writer")
+ .field("writer", &format_args!("<&mut dyn fmt::Write>"))
+ .field("is_ansi", &self.is_ansi)
+ .finish()
+ }
+}
+
+// === impl Format ===
+
+impl Default for Format<Full, SystemTime> {
+ fn default() -> Self {
+ Format {
+ format: Full,
+ timer: SystemTime,
+ ansi: None,
+ display_timestamp: true,
+ display_target: true,
+ display_level: true,
+ display_thread_id: false,
+ display_thread_name: false,
+ }
+ }
+}
+
+impl<F, T> Format<F, T> {
+ /// Use a less verbose output format.
+ ///
+ /// See [`Compact`].
+ pub fn compact(self) -> Format<Compact, T> {
+ Format {
+ format: Compact,
+ timer: self.timer,
+ ansi: self.ansi,
+ display_target: self.display_target,
+ display_timestamp: self.display_timestamp,
+ display_level: self.display_level,
+ display_thread_id: self.display_thread_id,
+ display_thread_name: self.display_thread_name,
+ }
+ }
+
+ /// Use an excessively pretty, human-readable output format.
+ ///
+ /// See [`Pretty`].
+ ///
+ /// Note that this requires the "ansi" feature to be enabled.
+ ///
+ /// # Options
+ ///
+ /// [`Format::with_ansi`] can be used to disable ANSI terminal escape codes (which enable
+ /// formatting such as colors, bold, italic, etc) in event formatting. However, a field
+ /// formatter must be manually provided to avoid ANSI in the formatting of parent spans, like
+ /// so:
+ ///
+ /// ```
+ /// # use tracing_subscriber::fmt::format;
+ /// tracing_subscriber::fmt()
+ /// .pretty()
+ /// .with_ansi(false)
+ /// .fmt_fields(format::PrettyFields::new().with_ansi(false))
+ /// // ... other settings ...
+ /// .init();
+ /// ```
+ #[cfg(feature = "ansi")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "ansi")))]
+ pub fn pretty(self) -> Format<Pretty, T> {
+ Format {
+ format: Pretty::default(),
+ timer: self.timer,
+ ansi: self.ansi,
+ display_target: self.display_target,
+ display_timestamp: self.display_timestamp,
+ display_level: self.display_level,
+ display_thread_id: self.display_thread_id,
+ display_thread_name: self.display_thread_name,
+ }
+ }
+
+ /// Use the full JSON format.
+ ///
+ /// The full format includes fields from all entered spans.
+ ///
+ /// # Example Output
+ ///
+ /// ```ignore,json
+ /// {"timestamp":"Feb 20 11:28:15.096","level":"INFO","target":"mycrate","fields":{"message":"some message", "key": "value"}}
+ /// ```
+ ///
+ /// # Options
+ ///
+ /// - [`Format::flatten_event`] can be used to enable flattening event fields into the root
+ /// object.
+ ///
+ /// [`Format::flatten_event`]: #method.flatten_event
+ #[cfg(feature = "json")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+ pub fn json(self) -> Format<Json, T> {
+ Format {
+ format: Json::default(),
+ timer: self.timer,
+ ansi: self.ansi,
+ display_target: self.display_target,
+ display_timestamp: self.display_timestamp,
+ display_level: self.display_level,
+ display_thread_id: self.display_thread_id,
+ display_thread_name: self.display_thread_name,
+ }
+ }
+
+ /// Use the given [`timer`] for log message timestamps.
+ ///
+ /// See [`time` module] for the provided timer implementations.
+ ///
+ /// Note that using the `"time"` feature flag enables the
+ /// additional time formatters [`UtcTime`] and [`LocalTime`], which use the
+ /// [`time` crate] to provide more sophisticated timestamp formatting
+ /// options.
+ ///
+ /// [`timer`]: super::time::FormatTime
+ /// [`time` module]: mod@super::time
+ /// [`UtcTime`]: super::time::UtcTime
+ /// [`LocalTime`]: super::time::LocalTime
+ /// [`time` crate]: https://docs.rs/time/0.3
+ pub fn with_timer<T2>(self, timer: T2) -> Format<F, T2> {
+ Format {
+ format: self.format,
+ timer,
+ ansi: self.ansi,
+ display_target: self.display_target,
+ display_timestamp: self.display_timestamp,
+ display_level: self.display_level,
+ display_thread_id: self.display_thread_id,
+ display_thread_name: self.display_thread_name,
+ }
+ }
+
+ /// Do not emit timestamps with log messages.
+ pub fn without_time(self) -> Format<F, ()> {
+ Format {
+ format: self.format,
+ timer: (),
+ ansi: self.ansi,
+ display_timestamp: false,
+ display_target: self.display_target,
+ display_level: self.display_level,
+ display_thread_id: self.display_thread_id,
+ display_thread_name: self.display_thread_name,
+ }
+ }
+
+ /// Enable ANSI terminal colors for formatted output.
+ pub fn with_ansi(self, ansi: bool) -> Format<F, T> {
+ Format {
+ ansi: Some(ansi),
+ ..self
+ }
+ }
+
+ /// Sets whether or not an event's target is displayed.
+ pub fn with_target(self, display_target: bool) -> Format<F, T> {
+ Format {
+ display_target,
+ ..self
+ }
+ }
+
+ /// Sets whether or not an event's level is displayed.
+ pub fn with_level(self, display_level: bool) -> Format<F, T> {
+ Format {
+ display_level,
+ ..self
+ }
+ }
+
+ /// Sets whether or not the [thread ID] of the current thread is displayed
+ /// when formatting events
+ ///
+ /// [thread ID]: https://doc.rust-lang.org/stable/std/thread/struct.ThreadId.html
+ pub fn with_thread_ids(self, display_thread_id: bool) -> Format<F, T> {
+ Format {
+ display_thread_id,
+ ..self
+ }
+ }
+
+ /// Sets whether or not the [name] of the current thread is displayed
+ /// when formatting events
+ ///
+ /// [name]: https://doc.rust-lang.org/stable/std/thread/index.html#naming-threads
+ pub fn with_thread_names(self, display_thread_name: bool) -> Format<F, T> {
+ Format {
+ display_thread_name,
+ ..self
+ }
+ }
+
+ #[inline]
+ fn format_timestamp(&self, writer: &mut Writer<'_>) -> fmt::Result
+ where
+ T: FormatTime,
+ {
+ // If timestamps are disabled, do nothing.
+ if !self.display_timestamp {
+ return Ok(());
+ }
+
+ // If ANSI color codes are enabled, format the timestamp with ANSI
+ // colors.
+ #[cfg(feature = "ansi")]
+ {
+ if writer.has_ansi_escapes() {
+ let style = Style::new().dimmed();
+ write!(writer, "{}", style.prefix())?;
+ self.timer.format_time(writer)?;
+ write!(writer, "{} ", style.suffix())?;
+ return Ok(());
+ }
+ }
+
+ // Otherwise, just format the timestamp without ANSI formatting.
+ self.timer.format_time(writer)?;
+ writer.write_char(' ')
+ }
+}
+
+#[cfg(feature = "json")]
+#[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+impl<T> Format<Json, T> {
+ /// Use the full JSON format with the event's event fields flattened.
+ ///
+ /// # Example Output
+ ///
+ /// ```ignore,json
+ /// {"timestamp":"Feb 20 11:28:15.096","level":"INFO","target":"mycrate", "message":"some message", "key": "value"}
+ /// ```
+ /// See [`Json`](../format/struct.Json.html).
+ #[cfg(feature = "json")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+ pub fn flatten_event(mut self, flatten_event: bool) -> Format<Json, T> {
+ self.format.flatten_event(flatten_event);
+ self
+ }
+
+ /// Sets whether or not the formatter will include the current span in
+ /// formatted events.
+ ///
+ /// See [`format::Json`](../fmt/format/struct.Json.html)
+ #[cfg(feature = "json")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+ pub fn with_current_span(mut self, display_current_span: bool) -> Format<Json, T> {
+ self.format.with_current_span(display_current_span);
+ self
+ }
+
+ /// Sets whether or not the formatter will include a list (from root to
+ /// leaf) of all currently entered spans in formatted events.
+ ///
+ /// See [`format::Json`](../fmt/format/struct.Json.html)
+ #[cfg(feature = "json")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+ pub fn with_span_list(mut self, display_span_list: bool) -> Format<Json, T> {
+ self.format.with_span_list(display_span_list);
+ self
+ }
+}
+
+impl<S, N, T> FormatEvent<S, N> for Format<Full, T>
+where
+ S: Subscriber + for<'a> LookupSpan<'a>,
+ N: for<'a> FormatFields<'a> + 'static,
+ T: FormatTime,
+{
+ fn format_event(
+ &self,
+ ctx: &FmtContext<'_, S, N>,
+ mut writer: Writer<'_>,
+ event: &Event<'_>,
+ ) -> fmt::Result {
+ #[cfg(feature = "tracing-log")]
+ let normalized_meta = event.normalized_metadata();
+ #[cfg(feature = "tracing-log")]
+ let meta = normalized_meta.as_ref().unwrap_or_else(|| event.metadata());
+ #[cfg(not(feature = "tracing-log"))]
+ let meta = event.metadata();
+
+ // if the `Format` struct *also* has an ANSI color configuration,
+ // override the writer...the API for configuring ANSI color codes on the
+ // `Format` struct is deprecated, but we still need to honor those
+ // configurations.
+ if let Some(ansi) = self.ansi {
+ writer = writer.with_ansi(ansi);
+ }
+
+ self.format_timestamp(&mut writer)?;
+
+ if self.display_level {
+ let fmt_level = {
+ #[cfg(feature = "ansi")]
+ {
+ FmtLevel::new(meta.level(), writer.has_ansi_escapes())
+ }
+ #[cfg(not(feature = "ansi"))]
+ {
+ FmtLevel::new(meta.level())
+ }
+ };
+ write!(writer, "{} ", fmt_level)?;
+ }
+
+ if self.display_thread_name {
+ let current_thread = std::thread::current();
+ match current_thread.name() {
+ Some(name) => {
+ write!(writer, "{} ", FmtThreadName::new(name))?;
+ }
+ // fall-back to thread id when name is absent and ids are not enabled
+ None if !self.display_thread_id => {
+ write!(writer, "{:0>2?} ", current_thread.id())?;
+ }
+ _ => {}
+ }
+ }
+
+ if self.display_thread_id {
+ write!(writer, "{:0>2?} ", std::thread::current().id())?;
+ }
+
+ let dimmed = writer.dimmed();
+
+ if let Some(scope) = ctx.event_scope() {
+ let bold = writer.bold();
+
+ let mut seen = false;
+
+ for span in scope.from_root() {
+ write!(writer, "{}", bold.paint(span.metadata().name()))?;
+ seen = true;
+
+ let ext = span.extensions();
+ if let Some(fields) = &ext.get::<FormattedFields<N>>() {
+ if !fields.is_empty() {
+ write!(writer, "{}{}{}", bold.paint("{"), fields, bold.paint("}"))?;
+ }
+ }
+ write!(writer, "{}", dimmed.paint(":"))?;
+ }
+
+ if seen {
+ writer.write_char(' ')?;
+ }
+ };
+
+ if self.display_target {
+ write!(
+ writer,
+ "{}{} ",
+ dimmed.paint(meta.target()),
+ dimmed.paint(":")
+ )?;
+ }
+
+ ctx.format_fields(writer.by_ref(), event)?;
+ writeln!(writer)
+ }
+}
+
+impl<S, N, T> FormatEvent<S, N> for Format<Compact, T>
+where
+ S: Subscriber + for<'a> LookupSpan<'a>,
+ N: for<'a> FormatFields<'a> + 'static,
+ T: FormatTime,
+{
+ fn format_event(
+ &self,
+ ctx: &FmtContext<'_, S, N>,
+ mut writer: Writer<'_>,
+ event: &Event<'_>,
+ ) -> fmt::Result {
+ #[cfg(feature = "tracing-log")]
+ let normalized_meta = event.normalized_metadata();
+ #[cfg(feature = "tracing-log")]
+ let meta = normalized_meta.as_ref().unwrap_or_else(|| event.metadata());
+ #[cfg(not(feature = "tracing-log"))]
+ let meta = event.metadata();
+
+ // if the `Format` struct *also* has an ANSI color configuration,
+ // override the writer...the API for configuring ANSI color codes on the
+ // `Format` struct is deprecated, but we still need to honor those
+ // configurations.
+ if let Some(ansi) = self.ansi {
+ writer = writer.with_ansi(ansi);
+ }
+
+ self.format_timestamp(&mut writer)?;
+
+ if self.display_level {
+ let fmt_level = {
+ #[cfg(feature = "ansi")]
+ {
+ FmtLevel::new(meta.level(), writer.has_ansi_escapes())
+ }
+ #[cfg(not(feature = "ansi"))]
+ {
+ FmtLevel::new(meta.level())
+ }
+ };
+ write!(writer, "{} ", fmt_level)?;
+ }
+
+ if self.display_thread_name {
+ let current_thread = std::thread::current();
+ match current_thread.name() {
+ Some(name) => {
+ write!(writer, "{} ", FmtThreadName::new(name))?;
+ }
+ // fall-back to thread id when name is absent and ids are not enabled
+ None if !self.display_thread_id => {
+ write!(writer, "{:0>2?} ", current_thread.id())?;
+ }
+ _ => {}
+ }
+ }
+
+ if self.display_thread_id {
+ write!(writer, "{:0>2?} ", std::thread::current().id())?;
+ }
+
+ let fmt_ctx = {
+ #[cfg(feature = "ansi")]
+ {
+ FmtCtx::new(ctx, event.parent(), writer.has_ansi_escapes())
+ }
+ #[cfg(not(feature = "ansi"))]
+ {
+ FmtCtx::new(&ctx, event.parent())
+ }
+ };
+ write!(writer, "{}", fmt_ctx)?;
+
+ if self.display_target {
+ write!(
+ writer,
+ "{}{} ",
+ writer.bold().paint(meta.target()),
+ writer.dimmed().paint(":")
+ )?;
+ }
+
+ ctx.format_fields(writer.by_ref(), event)?;
+
+ let dimmed = writer.dimmed();
+ for span in ctx
+ .event_scope()
+ .into_iter()
+ .map(crate::registry::Scope::from_root)
+ .flatten()
+ {
+ let exts = span.extensions();
+ if let Some(fields) = exts.get::<FormattedFields<N>>() {
+ if !fields.is_empty() {
+ write!(writer, " {}", dimmed.paint(&fields.fields))?;
+ }
+ }
+ }
+ writeln!(writer)
+ }
+}
+
+// === impl FormatFields ===
+impl<'writer, M> FormatFields<'writer> for M
+where
+ M: MakeOutput<Writer<'writer>, fmt::Result>,
+ M::Visitor: VisitFmt + VisitOutput<fmt::Result>,
+{
+ fn format_fields<R: RecordFields>(&self, writer: Writer<'writer>, fields: R) -> fmt::Result {
+ let mut v = self.make_visitor(writer);
+ fields.record(&mut v);
+ v.finish()
+ }
+}
+
+/// The default [`FormatFields`] implementation.
+///
+/// [`FormatFields`]: trait.FormatFields.html
+#[derive(Debug)]
+pub struct DefaultFields {
+ // reserve the ability to add fields to this without causing a breaking
+ // change in the future.
+ _private: (),
+}
+
+/// The [visitor] produced by [`DefaultFields`]'s [`MakeVisitor`] implementation.
+///
+/// [visitor]: super::super::field::Visit
+/// [`MakeVisitor`]: super::super::field::MakeVisitor
+#[derive(Debug)]
+pub struct DefaultVisitor<'a> {
+ writer: Writer<'a>,
+ is_empty: bool,
+ result: fmt::Result,
+}
+
+impl DefaultFields {
+ /// Returns a new default [`FormatFields`] implementation.
+ ///
+ /// [`FormatFields`]: trait.FormatFields.html
+ pub fn new() -> Self {
+ Self { _private: () }
+ }
+}
+
+impl Default for DefaultFields {
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
+impl<'a> MakeVisitor<Writer<'a>> for DefaultFields {
+ type Visitor = DefaultVisitor<'a>;
+
+ #[inline]
+ fn make_visitor(&self, target: Writer<'a>) -> Self::Visitor {
+ DefaultVisitor::new(target, true)
+ }
+}
+
+// === impl DefaultVisitor ===
+
+impl<'a> DefaultVisitor<'a> {
+ /// Returns a new default visitor that formats to the provided `writer`.
+ ///
+ /// # Arguments
+ /// - `writer`: the writer to format to.
+ /// - `is_empty`: whether or not any fields have been previously written to
+ /// that writer.
+ pub fn new(writer: Writer<'a>, is_empty: bool) -> Self {
+ Self {
+ writer,
+ is_empty,
+ result: Ok(()),
+ }
+ }
+
+ fn maybe_pad(&mut self) {
+ if self.is_empty {
+ self.is_empty = false;
+ } else {
+ self.result = write!(self.writer, " ");
+ }
+ }
+}
+
+impl<'a> field::Visit for DefaultVisitor<'a> {
+ fn record_str(&mut self, field: &Field, value: &str) {
+ if self.result.is_err() {
+ return;
+ }
+
+ if field.name() == "message" {
+ self.record_debug(field, &format_args!("{}", value))
+ } else {
+ self.record_debug(field, &value)
+ }
+ }
+
+ fn record_error(&mut self, field: &Field, value: &(dyn std::error::Error + 'static)) {
+ if let Some(source) = value.source() {
+ let italic = self.writer.italic();
+ self.record_debug(
+ field,
+ &format_args!(
+ "{} {}{}{}{}",
+ value,
+ italic.paint(field.name()),
+ italic.paint(".sources"),
+ self.writer.dimmed().paint("="),
+ ErrorSourceList(source)
+ ),
+ )
+ } else {
+ self.record_debug(field, &format_args!("{}", value))
+ }
+ }
+
+ fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
+ if self.result.is_err() {
+ return;
+ }
+
+ self.maybe_pad();
+ self.result = match field.name() {
+ "message" => write!(self.writer, "{:?}", value),
+ // Skip fields that are actually log metadata that have already been handled
+ #[cfg(feature = "tracing-log")]
+ name if name.starts_with("log.") => Ok(()),
+ name if name.starts_with("r#") => write!(
+ self.writer,
+ "{}{}{:?}",
+ self.writer.italic().paint(&name[2..]),
+ self.writer.dimmed().paint("="),
+ value
+ ),
+ name => write!(
+ self.writer,
+ "{}{}{:?}",
+ self.writer.italic().paint(name),
+ self.writer.dimmed().paint("="),
+ value
+ ),
+ };
+ }
+}
+
+impl<'a> crate::field::VisitOutput<fmt::Result> for DefaultVisitor<'a> {
+ fn finish(self) -> fmt::Result {
+ self.result
+ }
+}
+
+impl<'a> crate::field::VisitFmt for DefaultVisitor<'a> {
+ fn writer(&mut self) -> &mut dyn fmt::Write {
+ &mut self.writer
+ }
+}
+
+/// Renders an error into a list of sources, *including* the error
+struct ErrorSourceList<'a>(&'a (dyn std::error::Error + 'static));
+
+impl<'a> Display for ErrorSourceList<'a> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let mut list = f.debug_list();
+ let mut curr = Some(self.0);
+ while let Some(curr_err) = curr {
+ list.entry(&format_args!("{}", curr_err));
+ curr = curr_err.source();
+ }
+ list.finish()
+ }
+}
+
+struct FmtCtx<'a, S, N> {
+ ctx: &'a FmtContext<'a, S, N>,
+ span: Option<&'a span::Id>,
+ #[cfg(feature = "ansi")]
+ ansi: bool,
+}
+
+impl<'a, S, N: 'a> FmtCtx<'a, S, N>
+where
+ S: Subscriber + for<'lookup> LookupSpan<'lookup>,
+ N: for<'writer> FormatFields<'writer> + 'static,
+{
+ #[cfg(feature = "ansi")]
+ pub(crate) fn new(
+ ctx: &'a FmtContext<'_, S, N>,
+ span: Option<&'a span::Id>,
+ ansi: bool,
+ ) -> Self {
+ Self { ctx, span, ansi }
+ }
+
+ #[cfg(not(feature = "ansi"))]
+ pub(crate) fn new(ctx: &'a FmtContext<'_, S, N>, span: Option<&'a span::Id>) -> Self {
+ Self { ctx, span }
+ }
+
+ fn bold(&self) -> Style {
+ #[cfg(feature = "ansi")]
+ {
+ if self.ansi {
+ return Style::new().bold();
+ }
+ }
+
+ Style::new()
+ }
+}
+
+impl<'a, S, N: 'a> fmt::Display for FmtCtx<'a, S, N>
+where
+ S: Subscriber + for<'lookup> LookupSpan<'lookup>,
+ N: for<'writer> FormatFields<'writer> + 'static,
+{
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let bold = self.bold();
+ let mut seen = false;
+
+ let span = self
+ .span
+ .and_then(|id| self.ctx.ctx.span(id))
+ .or_else(|| self.ctx.ctx.lookup_current());
+
+ let scope = span.into_iter().flat_map(|span| span.scope().from_root());
+
+ for span in scope {
+ seen = true;
+ write!(f, "{}:", bold.paint(span.metadata().name()))?;
+ }
+
+ if seen {
+ f.write_char(' ')?;
+ }
+ Ok(())
+ }
+}
+
+#[cfg(not(feature = "ansi"))]
+struct Style;
+
+#[cfg(not(feature = "ansi"))]
+impl Style {
+ fn new() -> Self {
+ Style
+ }
+
+ fn bold(self) -> Self {
+ self
+ }
+
+ fn paint(&self, d: impl fmt::Display) -> impl fmt::Display {
+ d
+ }
+}
+
+struct FmtThreadName<'a> {
+ name: &'a str,
+}
+
+impl<'a> FmtThreadName<'a> {
+ pub(crate) fn new(name: &'a str) -> Self {
+ Self { name }
+ }
+}
+
+impl<'a> fmt::Display for FmtThreadName<'a> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ use std::sync::atomic::{
+ AtomicUsize,
+ Ordering::{AcqRel, Acquire, Relaxed},
+ };
+
+ // Track the longest thread name length we've seen so far in an atomic,
+ // so that it can be updated by any thread.
+ static MAX_LEN: AtomicUsize = AtomicUsize::new(0);
+ let len = self.name.len();
+ // Snapshot the current max thread name length.
+ let mut max_len = MAX_LEN.load(Relaxed);
+
+ while len > max_len {
+ // Try to set a new max length, if it is still the value we took a
+ // snapshot of.
+ match MAX_LEN.compare_exchange(max_len, len, AcqRel, Acquire) {
+ // We successfully set the new max value
+ Ok(_) => break,
+ // Another thread set a new max value since we last observed
+ // it! It's possible that the new length is actually longer than
+ // ours, so we'll loop again and check whether our length is
+ // still the longest. If not, we'll just use the newer value.
+ Err(actual) => max_len = actual,
+ }
+ }
+
+ // pad thread name using `max_len`
+ write!(f, "{:>width$}", self.name, width = max_len)
+ }
+}
+
+struct FmtLevel<'a> {
+ level: &'a Level,
+ #[cfg(feature = "ansi")]
+ ansi: bool,
+}
+
+impl<'a> FmtLevel<'a> {
+ #[cfg(feature = "ansi")]
+ pub(crate) fn new(level: &'a Level, ansi: bool) -> Self {
+ Self { level, ansi }
+ }
+
+ #[cfg(not(feature = "ansi"))]
+ pub(crate) fn new(level: &'a Level) -> Self {
+ Self { level }
+ }
+}
+
+const TRACE_STR: &str = "TRACE";
+const DEBUG_STR: &str = "DEBUG";
+const INFO_STR: &str = " INFO";
+const WARN_STR: &str = " WARN";
+const ERROR_STR: &str = "ERROR";
+
+#[cfg(not(feature = "ansi"))]
+impl<'a> fmt::Display for FmtLevel<'a> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match *self.level {
+ Level::TRACE => f.pad(TRACE_STR),
+ Level::DEBUG => f.pad(DEBUG_STR),
+ Level::INFO => f.pad(INFO_STR),
+ Level::WARN => f.pad(WARN_STR),
+ Level::ERROR => f.pad(ERROR_STR),
+ }
+ }
+}
+
+#[cfg(feature = "ansi")]
+impl<'a> fmt::Display for FmtLevel<'a> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ if self.ansi {
+ match *self.level {
+ Level::TRACE => write!(f, "{}", Colour::Purple.paint(TRACE_STR)),
+ Level::DEBUG => write!(f, "{}", Colour::Blue.paint(DEBUG_STR)),
+ Level::INFO => write!(f, "{}", Colour::Green.paint(INFO_STR)),
+ Level::WARN => write!(f, "{}", Colour::Yellow.paint(WARN_STR)),
+ Level::ERROR => write!(f, "{}", Colour::Red.paint(ERROR_STR)),
+ }
+ } else {
+ match *self.level {
+ Level::TRACE => f.pad(TRACE_STR),
+ Level::DEBUG => f.pad(DEBUG_STR),
+ Level::INFO => f.pad(INFO_STR),
+ Level::WARN => f.pad(WARN_STR),
+ Level::ERROR => f.pad(ERROR_STR),
+ }
+ }
+ }
+}
+
+// === impl FieldFn ===
+
+impl<'a, F> MakeVisitor<Writer<'a>> for FieldFn<F>
+where
+ F: Fn(&mut Writer<'a>, &Field, &dyn fmt::Debug) -> fmt::Result + Clone,
+{
+ type Visitor = FieldFnVisitor<'a, F>;
+
+ fn make_visitor(&self, writer: Writer<'a>) -> Self::Visitor {
+ FieldFnVisitor {
+ writer,
+ f: self.0.clone(),
+ result: Ok(()),
+ }
+ }
+}
+
+impl<'a, F> Visit for FieldFnVisitor<'a, F>
+where
+ F: Fn(&mut Writer<'a>, &Field, &dyn fmt::Debug) -> fmt::Result,
+{
+ fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
+ if self.result.is_ok() {
+ self.result = (self.f)(&mut self.writer, field, value)
+ }
+ }
+}
+
+impl<'a, F> VisitOutput<fmt::Result> for FieldFnVisitor<'a, F>
+where
+ F: Fn(&mut Writer<'a>, &Field, &dyn fmt::Debug) -> fmt::Result,
+{
+ fn finish(self) -> fmt::Result {
+ self.result
+ }
+}
+
+impl<'a, F> VisitFmt for FieldFnVisitor<'a, F>
+where
+ F: Fn(&mut Writer<'a>, &Field, &dyn fmt::Debug) -> fmt::Result,
+{
+ fn writer(&mut self) -> &mut dyn fmt::Write {
+ &mut self.writer
+ }
+}
+
+impl<'a, F> fmt::Debug for FieldFnVisitor<'a, F> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("FieldFnVisitor")
+ .field("f", &format_args!("{}", std::any::type_name::<F>()))
+ .field("writer", &self.writer)
+ .field("result", &self.result)
+ .finish()
+ }
+}
+
+// === printing synthetic Span events ===
+
+/// Configures what points in the span lifecycle are logged as events.
+///
+/// See also [`with_span_events`](../struct.SubscriberBuilder.html#method.with_span_events).
+#[derive(Clone, Eq, PartialEq, Ord, PartialOrd)]
+pub struct FmtSpan(u8);
+
+impl FmtSpan {
+ /// one event when span is created
+ pub const NEW: FmtSpan = FmtSpan(1 << 0);
+ /// one event per enter of a span
+ pub const ENTER: FmtSpan = FmtSpan(1 << 1);
+ /// one event per exit of a span
+ pub const EXIT: FmtSpan = FmtSpan(1 << 2);
+ /// one event when the span is dropped
+ pub const CLOSE: FmtSpan = FmtSpan(1 << 3);
+
+ /// spans are ignored (this is the default)
+ pub const NONE: FmtSpan = FmtSpan(0);
+ /// one event per enter/exit of a span
+ pub const ACTIVE: FmtSpan = FmtSpan(FmtSpan::ENTER.0 | FmtSpan::EXIT.0);
+ /// events at all points (new, enter, exit, drop)
+ pub const FULL: FmtSpan =
+ FmtSpan(FmtSpan::NEW.0 | FmtSpan::ENTER.0 | FmtSpan::EXIT.0 | FmtSpan::CLOSE.0);
+
+ /// Check whether or not a certain flag is set for this [`FmtSpan`]
+ fn contains(&self, other: FmtSpan) -> bool {
+ self.clone() & other.clone() == other
+ }
+}
+
+macro_rules! impl_fmt_span_bit_op {
+ ($trait:ident, $func:ident, $op:tt) => {
+ impl std::ops::$trait for FmtSpan {
+ type Output = FmtSpan;
+
+ fn $func(self, rhs: Self) -> Self::Output {
+ FmtSpan(self.0 $op rhs.0)
+ }
+ }
+ };
+}
+
+macro_rules! impl_fmt_span_bit_assign_op {
+ ($trait:ident, $func:ident, $op:tt) => {
+ impl std::ops::$trait for FmtSpan {
+ fn $func(&mut self, rhs: Self) {
+ *self = FmtSpan(self.0 $op rhs.0)
+ }
+ }
+ };
+}
+
+impl_fmt_span_bit_op!(BitAnd, bitand, &);
+impl_fmt_span_bit_op!(BitOr, bitor, |);
+impl_fmt_span_bit_op!(BitXor, bitxor, ^);
+
+impl_fmt_span_bit_assign_op!(BitAndAssign, bitand_assign, &);
+impl_fmt_span_bit_assign_op!(BitOrAssign, bitor_assign, |);
+impl_fmt_span_bit_assign_op!(BitXorAssign, bitxor_assign, ^);
+
+impl Debug for FmtSpan {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let mut wrote_flag = false;
+ let mut write_flags = |flag, flag_str| -> fmt::Result {
+ if self.contains(flag) {
+ if wrote_flag {
+ f.write_str(" | ")?;
+ }
+
+ f.write_str(flag_str)?;
+ wrote_flag = true;
+ }
+
+ Ok(())
+ };
+
+ if FmtSpan::NONE | self.clone() == FmtSpan::NONE {
+ f.write_str("FmtSpan::NONE")?;
+ } else {
+ write_flags(FmtSpan::NEW, "FmtSpan::NEW")?;
+ write_flags(FmtSpan::ENTER, "FmtSpan::ENTER")?;
+ write_flags(FmtSpan::EXIT, "FmtSpan::EXIT")?;
+ write_flags(FmtSpan::CLOSE, "FmtSpan::CLOSE")?;
+ }
+
+ Ok(())
+ }
+}
+
+pub(super) struct FmtSpanConfig {
+ pub(super) kind: FmtSpan,
+ pub(super) fmt_timing: bool,
+}
+
+impl FmtSpanConfig {
+ pub(super) fn without_time(self) -> Self {
+ Self {
+ kind: self.kind,
+ fmt_timing: false,
+ }
+ }
+ pub(super) fn with_kind(self, kind: FmtSpan) -> Self {
+ Self {
+ kind,
+ fmt_timing: self.fmt_timing,
+ }
+ }
+ pub(super) fn trace_new(&self) -> bool {
+ self.kind.contains(FmtSpan::NEW)
+ }
+ pub(super) fn trace_enter(&self) -> bool {
+ self.kind.contains(FmtSpan::ENTER)
+ }
+ pub(super) fn trace_exit(&self) -> bool {
+ self.kind.contains(FmtSpan::EXIT)
+ }
+ pub(super) fn trace_close(&self) -> bool {
+ self.kind.contains(FmtSpan::CLOSE)
+ }
+}
+
+impl Debug for FmtSpanConfig {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ self.kind.fmt(f)
+ }
+}
+
+impl Default for FmtSpanConfig {
+ fn default() -> Self {
+ Self {
+ kind: FmtSpan::NONE,
+ fmt_timing: true,
+ }
+ }
+}
+
+pub(super) struct TimingDisplay(pub(super) u64);
+impl Display for TimingDisplay {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let mut t = self.0 as f64;
+ for unit in ["ns", "µs", "ms", "s"].iter() {
+ if t < 10.0 {
+ return write!(f, "{:.2}{}", t, unit);
+ } else if t < 100.0 {
+ return write!(f, "{:.1}{}", t, unit);
+ } else if t < 1000.0 {
+ return write!(f, "{:.0}{}", t, unit);
+ }
+ t /= 1000.0;
+ }
+ write!(f, "{:.0}s", t * 1000.0)
+ }
+}
+
+#[cfg(test)]
+pub(super) mod test {
+ use crate::fmt::{test::MockMakeWriter, time::FormatTime};
+ use tracing::{
+ self,
+ dispatcher::{set_default, Dispatch},
+ subscriber::with_default,
+ };
+
+ use super::*;
+ use std::fmt;
+
+ pub(crate) struct MockTime;
+ impl FormatTime for MockTime {
+ fn format_time(&self, w: &mut Writer<'_>) -> fmt::Result {
+ write!(w, "fake time")
+ }
+ }
+
+ #[test]
+ fn disable_everything() {
+ // This test reproduces https://github.com/tokio-rs/tracing/issues/1354
+ let make_writer = MockMakeWriter::default();
+ let subscriber = crate::fmt::Subscriber::builder()
+ .with_writer(make_writer.clone())
+ .without_time()
+ .with_level(false)
+ .with_target(false)
+ .with_thread_ids(false)
+ .with_thread_names(false);
+ #[cfg(feature = "ansi")]
+ let subscriber = subscriber.with_ansi(false);
+ run_test(subscriber, make_writer, "hello\n")
+ }
+
+ fn test_ansi<T>(
+ is_ansi: bool,
+ expected: &str,
+ builder: crate::fmt::SubscriberBuilder<DefaultFields, Format<T>>,
+ ) where
+ Format<T, MockTime>: FormatEvent<crate::Registry, DefaultFields>,
+ T: Send + Sync + 'static,
+ {
+ let make_writer = MockMakeWriter::default();
+ let subscriber = builder
+ .with_writer(make_writer.clone())
+ .with_ansi(is_ansi)
+ .with_timer(MockTime);
+ run_test(subscriber, make_writer, expected)
+ }
+
+ #[cfg(not(feature = "ansi"))]
+ fn test_without_ansi<T>(
+ expected: &str,
+ builder: crate::fmt::SubscriberBuilder<DefaultFields, Format<T>>,
+ ) where
+ Format<T, MockTime>: FormatEvent<crate::Registry, DefaultFields>,
+ T: Send + Sync,
+ {
+ let make_writer = MockMakeWriter::default();
+ let subscriber = builder.with_writer(make_writer).with_timer(MockTime);
+ run_test(subscriber, make_writer, expected)
+ }
+
+ fn test_without_level<T>(
+ expected: &str,
+ builder: crate::fmt::SubscriberBuilder<DefaultFields, Format<T>>,
+ ) where
+ Format<T, MockTime>: FormatEvent<crate::Registry, DefaultFields>,
+ T: Send + Sync + 'static,
+ {
+ let make_writer = MockMakeWriter::default();
+ let subscriber = builder
+ .with_writer(make_writer.clone())
+ .with_level(false)
+ .with_ansi(false)
+ .with_timer(MockTime);
+ run_test(subscriber, make_writer, expected);
+ }
+
+ fn test_overridden_parents<T>(
+ expected: &str,
+ builder: crate::fmt::SubscriberBuilder<DefaultFields, Format<T>>,
+ ) where
+ Format<T, MockTime>: FormatEvent<crate::Registry, DefaultFields>,
+ T: Send + Sync + 'static,
+ {
+ let make_writer = MockMakeWriter::default();
+ let collector = builder
+ .with_writer(make_writer.clone())
+ .with_level(false)
+ .with_ansi(false)
+ .with_timer(MockTime)
+ .finish();
+
+ with_default(collector, || {
+ let span1 = tracing::info_span!("span1", span = 1);
+ let span2 = tracing::info_span!(parent: &span1, "span2", span = 2);
+ tracing::info!(parent: &span2, "hello");
+ });
+ assert_eq!(expected, make_writer.get_string());
+ }
+
+ fn test_overridden_parents_in_scope<T>(
+ expected1: &str,
+ expected2: &str,
+ builder: crate::fmt::SubscriberBuilder<DefaultFields, Format<T>>,
+ ) where
+ Format<T, MockTime>: FormatEvent<crate::Registry, DefaultFields>,
+ T: Send + Sync + 'static,
+ {
+ let make_writer = MockMakeWriter::default();
+ let subscriber = builder
+ .with_writer(make_writer.clone())
+ .with_level(false)
+ .with_ansi(false)
+ .with_timer(MockTime)
+ .finish();
+
+ with_default(subscriber, || {
+ let span1 = tracing::info_span!("span1", span = 1);
+ let span2 = tracing::info_span!(parent: &span1, "span2", span = 2);
+ let span3 = tracing::info_span!("span3", span = 3);
+ let _e3 = span3.enter();
+
+ tracing::info!("hello");
+ assert_eq!(expected1, make_writer.get_string().as_str());
+
+ tracing::info!(parent: &span2, "hello");
+ assert_eq!(expected2, make_writer.get_string().as_str());
+ });
+ }
+
+ fn run_test(subscriber: impl Into<Dispatch>, buf: MockMakeWriter, expected: &str) {
+ let _default = set_default(&subscriber.into());
+ tracing::info!("hello");
+ assert_eq!(expected, buf.get_string())
+ }
+
+ mod default {
+ use super::*;
+ #[cfg(feature = "ansi")]
+ #[test]
+ fn with_ansi_true() {
+ let expected = "\u{1b}[2mfake time\u{1b}[0m \u{1b}[32m INFO\u{1b}[0m \u{1b}[2mtracing_subscriber::fmt::format::test\u{1b}[0m\u{1b}[2m:\u{1b}[0m hello\n";
+ test_ansi(true, expected, crate::fmt::Subscriber::builder());
+ }
+
+ #[cfg(feature = "ansi")]
+ #[test]
+ fn with_ansi_false() {
+ let expected = "fake time INFO tracing_subscriber::fmt::format::test: hello\n";
+ test_ansi(false, expected, crate::fmt::Subscriber::builder());
+ }
+
+ #[cfg(not(feature = "ansi"))]
+ #[test]
+ fn without_ansi() {
+ let expected = "fake time INFO tracing_subscriber::fmt::format::test: hello\n";
+ test_without_ansi(expected, crate::fmt::Subscriber::builder())
+ }
+
+ #[test]
+ fn without_level() {
+ let expected = "fake time tracing_subscriber::fmt::format::test: hello\n";
+ test_without_level(expected, crate::fmt::Subscriber::builder())
+ }
+
+ #[test]
+ fn overridden_parents() {
+ let expected = "fake time span1{span=1}:span2{span=2}: tracing_subscriber::fmt::format::test: hello\n";
+ test_overridden_parents(expected, crate::fmt::Subscriber::builder())
+ }
+
+ #[test]
+ fn overridden_parents_in_scope() {
+ test_overridden_parents_in_scope(
+ "fake time span3{span=3}: tracing_subscriber::fmt::format::test: hello\n",
+ "fake time span1{span=1}:span2{span=2}: tracing_subscriber::fmt::format::test: hello\n",
+ crate::fmt::Subscriber::builder(),
+ )
+ }
+ }
+
+ mod compact {
+ use super::*;
+
+ #[cfg(feature = "ansi")]
+ #[test]
+ fn with_ansi_true() {
+ let expected = "\u{1b}[2mfake time\u{1b}[0m \u{1b}[32m INFO\u{1b}[0m \u{1b}[1mtracing_subscriber::fmt::format::test\u{1b}[0m\u{1b}[2m:\u{1b}[0m hello\n";
+ test_ansi(true, expected, crate::fmt::Subscriber::builder().compact())
+ }
+
+ #[cfg(feature = "ansi")]
+ #[test]
+ fn with_ansi_false() {
+ let expected = "fake time INFO tracing_subscriber::fmt::format::test: hello\n";
+ test_ansi(false, expected, crate::fmt::Subscriber::builder().compact());
+ }
+
+ #[cfg(not(feature = "ansi"))]
+ #[test]
+ fn without_ansi() {
+ let expected = "fake time INFO tracing_subscriber::fmt::format::test: hello\n";
+ test_without_ansi(expected, crate::fmt::Subscriber::builder().compact())
+ }
+
+ #[test]
+ fn without_level() {
+ let expected = "fake time tracing_subscriber::fmt::format::test: hello\n";
+ test_without_level(expected, crate::fmt::Subscriber::builder().compact());
+ }
+
+ #[test]
+ fn overridden_parents() {
+ let expected = "fake time span1:span2: tracing_subscriber::fmt::format::test: hello span=1 span=2\n";
+ test_overridden_parents(expected, crate::fmt::Subscriber::builder().compact())
+ }
+
+ #[test]
+ fn overridden_parents_in_scope() {
+ test_overridden_parents_in_scope(
+ "fake time span3: tracing_subscriber::fmt::format::test: hello span=3\n",
+ "fake time span1:span2: tracing_subscriber::fmt::format::test: hello span=1 span=2\n",
+ crate::fmt::Subscriber::builder().compact(),
+ )
+ }
+ }
+
+ #[test]
+ fn format_nanos() {
+ fn fmt(t: u64) -> String {
+ TimingDisplay(t).to_string()
+ }
+
+ assert_eq!(fmt(1), "1.00ns");
+ assert_eq!(fmt(12), "12.0ns");
+ assert_eq!(fmt(123), "123ns");
+ assert_eq!(fmt(1234), "1.23µs");
+ assert_eq!(fmt(12345), "12.3µs");
+ assert_eq!(fmt(123456), "123µs");
+ assert_eq!(fmt(1234567), "1.23ms");
+ assert_eq!(fmt(12345678), "12.3ms");
+ assert_eq!(fmt(123456789), "123ms");
+ assert_eq!(fmt(1234567890), "1.23s");
+ assert_eq!(fmt(12345678901), "12.3s");
+ assert_eq!(fmt(123456789012), "123s");
+ assert_eq!(fmt(1234567890123), "1235s");
+ }
+
+ #[test]
+ fn fmt_span_combinations() {
+ let f = FmtSpan::NONE;
+ assert!(!f.contains(FmtSpan::NEW));
+ assert!(!f.contains(FmtSpan::ENTER));
+ assert!(!f.contains(FmtSpan::EXIT));
+ assert!(!f.contains(FmtSpan::CLOSE));
+
+ let f = FmtSpan::ACTIVE;
+ assert!(!f.contains(FmtSpan::NEW));
+ assert!(f.contains(FmtSpan::ENTER));
+ assert!(f.contains(FmtSpan::EXIT));
+ assert!(!f.contains(FmtSpan::CLOSE));
+
+ let f = FmtSpan::FULL;
+ assert!(f.contains(FmtSpan::NEW));
+ assert!(f.contains(FmtSpan::ENTER));
+ assert!(f.contains(FmtSpan::EXIT));
+ assert!(f.contains(FmtSpan::CLOSE));
+
+ let f = FmtSpan::NEW | FmtSpan::CLOSE;
+ assert!(f.contains(FmtSpan::NEW));
+ assert!(!f.contains(FmtSpan::ENTER));
+ assert!(!f.contains(FmtSpan::EXIT));
+ assert!(f.contains(FmtSpan::CLOSE));
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/fmt/format/pretty.rs b/vendor/tracing-subscriber-0.3.3/src/fmt/format/pretty.rs
new file mode 100644
index 000000000..3e47e2d93
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/fmt/format/pretty.rs
@@ -0,0 +1,415 @@
+use super::*;
+use crate::{
+ field::{VisitFmt, VisitOutput},
+ fmt::fmt_layer::{FmtContext, FormattedFields},
+ registry::LookupSpan,
+};
+
+use std::fmt;
+use tracing_core::{
+ field::{self, Field},
+ Event, Level, Subscriber,
+};
+
+#[cfg(feature = "tracing-log")]
+use tracing_log::NormalizeEvent;
+
+use ansi_term::{Colour, Style};
+
+/// An excessively pretty, human-readable event formatter.
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct Pretty {
+ display_location: bool,
+}
+
+/// The [visitor] produced by [`Pretty`]'s [`MakeVisitor`] implementation.
+///
+/// [visitor]: field::Visit
+/// [`MakeVisitor`]: crate::field::MakeVisitor
+#[derive(Debug)]
+pub struct PrettyVisitor<'a> {
+ writer: Writer<'a>,
+ is_empty: bool,
+ style: Style,
+ result: fmt::Result,
+}
+
+/// An excessively pretty, human-readable [`MakeVisitor`] implementation.
+///
+/// [`MakeVisitor`]: crate::field::MakeVisitor
+#[derive(Debug)]
+pub struct PrettyFields {
+ /// A value to override the provided `Writer`'s ANSI formatting
+ /// configuration.
+ ///
+ /// If this is `Some`, we override the `Writer`'s ANSI setting. This is
+ /// necessary in order to continue supporting the deprecated
+ /// `PrettyFields::with_ansi` method. If it is `None`, we don't override the
+ /// ANSI formatting configuration (because the deprecated method was not
+ /// called).
+ // TODO: when `PrettyFields::with_ansi` is removed, we can get rid
+ // of this entirely.
+ ansi: Option<bool>,
+}
+
+// === impl Pretty ===
+
+impl Default for Pretty {
+ fn default() -> Self {
+ Self {
+ display_location: true,
+ }
+ }
+}
+
+impl Pretty {
+ fn style_for(level: &Level) -> Style {
+ match *level {
+ Level::TRACE => Style::new().fg(Colour::Purple),
+ Level::DEBUG => Style::new().fg(Colour::Blue),
+ Level::INFO => Style::new().fg(Colour::Green),
+ Level::WARN => Style::new().fg(Colour::Yellow),
+ Level::ERROR => Style::new().fg(Colour::Red),
+ }
+ }
+
+ /// Sets whether the event's source code location is displayed.
+ ///
+ /// This defaults to `true`.
+ pub fn with_source_location(self, display_location: bool) -> Self {
+ Self {
+ display_location,
+ ..self
+ }
+ }
+}
+
+impl<T> Format<Pretty, T> {
+ /// Sets whether or not the source code location from which an event
+ /// originated is displayed.
+ ///
+ /// This defaults to `true`.
+ pub fn with_source_location(mut self, display_location: bool) -> Self {
+ self.format = self.format.with_source_location(display_location);
+ self
+ }
+}
+
+impl<C, N, T> FormatEvent<C, N> for Format<Pretty, T>
+where
+ C: Subscriber + for<'a> LookupSpan<'a>,
+ N: for<'a> FormatFields<'a> + 'static,
+ T: FormatTime,
+{
+ fn format_event(
+ &self,
+ ctx: &FmtContext<'_, C, N>,
+ mut writer: Writer<'_>,
+ event: &Event<'_>,
+ ) -> fmt::Result {
+ #[cfg(feature = "tracing-log")]
+ let normalized_meta = event.normalized_metadata();
+ #[cfg(feature = "tracing-log")]
+ let meta = normalized_meta.as_ref().unwrap_or_else(|| event.metadata());
+ #[cfg(not(feature = "tracing-log"))]
+ let meta = event.metadata();
+ write!(&mut writer, " ")?;
+
+ // if the `Format` struct *also* has an ANSI color configuration,
+ // override the writer...the API for configuring ANSI color codes on the
+ // `Format` struct is deprecated, but we still need to honor those
+ // configurations.
+ if let Some(ansi) = self.ansi {
+ writer = writer.with_ansi(ansi);
+ }
+
+ self.format_timestamp(&mut writer)?;
+
+ let style = if self.display_level && writer.has_ansi_escapes() {
+ Pretty::style_for(meta.level())
+ } else {
+ Style::new()
+ };
+
+ if self.display_level {
+ write!(
+ writer,
+ "{} ",
+ super::FmtLevel::new(meta.level(), writer.has_ansi_escapes())
+ )?;
+ }
+
+ if self.display_target {
+ let target_style = if writer.has_ansi_escapes() {
+ style.bold()
+ } else {
+ style
+ };
+ write!(
+ writer,
+ "{}{}{}: ",
+ target_style.prefix(),
+ meta.target(),
+ target_style.infix(style)
+ )?;
+ }
+ let mut v = PrettyVisitor::new(writer.by_ref(), true).with_style(style);
+ event.record(&mut v);
+ v.finish()?;
+ writer.write_char('\n')?;
+
+ let dimmed = if writer.has_ansi_escapes() {
+ Style::new().dimmed().italic()
+ } else {
+ Style::new()
+ };
+ let thread = self.display_thread_name || self.display_thread_id;
+ if let (true, Some(file), Some(line)) =
+ (self.format.display_location, meta.file(), meta.line())
+ {
+ write!(
+ writer,
+ " {} {}:{}{}",
+ dimmed.paint("at"),
+ file,
+ line,
+ dimmed.paint(if thread { " " } else { "\n" })
+ )?;
+ } else if thread {
+ write!(writer, " ")?;
+ }
+
+ if thread {
+ write!(writer, "{} ", dimmed.paint("on"))?;
+ let thread = std::thread::current();
+ if self.display_thread_name {
+ if let Some(name) = thread.name() {
+ write!(writer, "{}", name)?;
+ if self.display_thread_id {
+ write!(writer, " ({:?})", thread.id())?;
+ }
+ } else if !self.display_thread_id {
+ write!(writer, " {:?}", thread.id())?;
+ }
+ } else if self.display_thread_id {
+ write!(writer, " {:?}", thread.id())?;
+ }
+ writer.write_char('\n')?;
+ }
+
+ let bold = writer.bold();
+ let span = event
+ .parent()
+ .and_then(|id| ctx.span(id))
+ .or_else(|| ctx.lookup_current());
+
+ let scope = span.into_iter().flat_map(|span| span.scope());
+
+ for span in scope {
+ let meta = span.metadata();
+ if self.display_target {
+ write!(
+ writer,
+ " {} {}::{}",
+ dimmed.paint("in"),
+ meta.target(),
+ bold.paint(meta.name()),
+ )?;
+ } else {
+ write!(
+ writer,
+ " {} {}",
+ dimmed.paint("in"),
+ bold.paint(meta.name()),
+ )?;
+ }
+
+ let ext = span.extensions();
+ let fields = &ext
+ .get::<FormattedFields<N>>()
+ .expect("Unable to find FormattedFields in extensions; this is a bug");
+ if !fields.is_empty() {
+ write!(writer, " {} {}", dimmed.paint("with"), fields)?;
+ }
+ writer.write_char('\n')?;
+ }
+
+ writer.write_char('\n')
+ }
+}
+
+impl<'writer> FormatFields<'writer> for Pretty {
+ fn format_fields<R: RecordFields>(&self, writer: Writer<'writer>, fields: R) -> fmt::Result {
+ let mut v = PrettyVisitor::new(writer, false);
+ fields.record(&mut v);
+ v.finish()
+ }
+
+ fn add_fields(
+ &self,
+ current: &'writer mut FormattedFields<Self>,
+ fields: &span::Record<'_>,
+ ) -> fmt::Result {
+ let empty = current.is_empty();
+ let writer = current.as_writer();
+ let mut v = PrettyVisitor::new(writer, empty);
+ fields.record(&mut v);
+ v.finish()
+ }
+}
+
+// === impl PrettyFields ===
+
+impl Default for PrettyFields {
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
+impl PrettyFields {
+ /// Returns a new default [`PrettyFields`] implementation.
+ pub fn new() -> Self {
+ // By default, don't override the `Writer`'s ANSI colors
+ // configuration. We'll only do this if the user calls the
+ // deprecated `PrettyFields::with_ansi` method.
+ Self { ansi: None }
+ }
+
+ /// Enable ANSI encoding for formatted fields.
+ #[deprecated(
+ since = "0.3.3",
+ note = "Use `fmt::Subscriber::with_ansi` or `fmt::Layer::with_ansi` instead."
+ )]
+ pub fn with_ansi(self, ansi: bool) -> Self {
+ Self {
+ ansi: Some(ansi),
+ ..self
+ }
+ }
+}
+
+impl<'a> MakeVisitor<Writer<'a>> for PrettyFields {
+ type Visitor = PrettyVisitor<'a>;
+
+ #[inline]
+ fn make_visitor(&self, mut target: Writer<'a>) -> Self::Visitor {
+ if let Some(ansi) = self.ansi {
+ target = target.with_ansi(ansi);
+ }
+ PrettyVisitor::new(target, true)
+ }
+}
+
+// === impl PrettyVisitor ===
+
+impl<'a> PrettyVisitor<'a> {
+ /// Returns a new default visitor that formats to the provided `writer`.
+ ///
+ /// # Arguments
+ /// - `writer`: the writer to format to.
+ /// - `is_empty`: whether or not any fields have been previously written to
+ /// that writer.
+ pub fn new(writer: Writer<'a>, is_empty: bool) -> Self {
+ Self {
+ writer,
+ is_empty,
+ style: Style::default(),
+ result: Ok(()),
+ }
+ }
+
+ pub(crate) fn with_style(self, style: Style) -> Self {
+ Self { style, ..self }
+ }
+
+ fn write_padded(&mut self, value: &impl fmt::Debug) {
+ let padding = if self.is_empty {
+ self.is_empty = false;
+ ""
+ } else {
+ ", "
+ };
+ self.result = write!(self.writer, "{}{:?}", padding, value);
+ }
+
+ fn bold(&self) -> Style {
+ if self.writer.has_ansi_escapes() {
+ self.style.bold()
+ } else {
+ Style::new()
+ }
+ }
+}
+
+impl<'a> field::Visit for PrettyVisitor<'a> {
+ fn record_str(&mut self, field: &Field, value: &str) {
+ if self.result.is_err() {
+ return;
+ }
+
+ if field.name() == "message" {
+ self.record_debug(field, &format_args!("{}", value))
+ } else {
+ self.record_debug(field, &value)
+ }
+ }
+
+ fn record_error(&mut self, field: &Field, value: &(dyn std::error::Error + 'static)) {
+ if let Some(source) = value.source() {
+ let bold = self.bold();
+ self.record_debug(
+ field,
+ &format_args!(
+ "{}, {}{}.sources{}: {}",
+ value,
+ bold.prefix(),
+ field,
+ bold.infix(self.style),
+ ErrorSourceList(source),
+ ),
+ )
+ } else {
+ self.record_debug(field, &format_args!("{}", value))
+ }
+ }
+
+ fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
+ if self.result.is_err() {
+ return;
+ }
+ let bold = self.bold();
+ match field.name() {
+ "message" => self.write_padded(&format_args!("{}{:?}", self.style.prefix(), value,)),
+ // Skip fields that are actually log metadata that have already been handled
+ #[cfg(feature = "tracing-log")]
+ name if name.starts_with("log.") => self.result = Ok(()),
+ name if name.starts_with("r#") => self.write_padded(&format_args!(
+ "{}{}{}: {:?}",
+ bold.prefix(),
+ &name[2..],
+ bold.infix(self.style),
+ value
+ )),
+ name => self.write_padded(&format_args!(
+ "{}{}{}: {:?}",
+ bold.prefix(),
+ name,
+ bold.infix(self.style),
+ value
+ )),
+ };
+ }
+}
+
+impl<'a> VisitOutput<fmt::Result> for PrettyVisitor<'a> {
+ fn finish(mut self) -> fmt::Result {
+ write!(&mut self.writer, "{}", self.style.suffix())?;
+ self.result
+ }
+}
+
+impl<'a> VisitFmt for PrettyVisitor<'a> {
+ fn writer(&mut self) -> &mut dyn fmt::Write {
+ &mut self.writer
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/fmt/mod.rs b/vendor/tracing-subscriber-0.3.3/src/fmt/mod.rs
new file mode 100644
index 000000000..d5deb8f0c
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/fmt/mod.rs
@@ -0,0 +1,1275 @@
+//! A `Subscriber` for formatting and logging `tracing` data.
+//!
+//! # Overview
+//!
+//! [`tracing`] is a framework for instrumenting Rust programs with context-aware,
+//! structured, event-based diagnostic information. This crate provides an
+//! implementation of the [`Subscriber`] trait that records `tracing`'s `Event`s
+//! and `Span`s by formatting them as text and logging them to stdout.
+//!
+//! # Usage
+//!
+//! First, add this to your `Cargo.toml` file:
+//!
+//! ```toml
+//! [dependencies]
+//! tracing-subscriber = "0.2"
+//! ```
+//!
+//! *Compiler support: requires rustc 1.39+*
+//!
+//! Add the following to your executable to initialize the default subscriber:
+//! ```rust
+//! use tracing_subscriber;
+//!
+//! tracing_subscriber::fmt::init();
+//! ```
+//!
+//! ## Filtering Events with Environment Variables
+//!
+//! The default subscriber installed by `init` enables you to filter events
+//! at runtime using environment variables (using the [`EnvFilter`]).
+//!
+//! The filter syntax is a superset of the [`env_logger`] syntax.
+//!
+//! For example:
+//! - Setting `RUST_LOG=debug` enables all `Span`s and `Event`s
+//! set to the log level `DEBUG` or higher
+//! - Setting `RUST_LOG=my_crate=trace` enables `Span`s and `Event`s
+//! in `my_crate` at all log levels
+//!
+//! **Note**: This should **not** be called by libraries. Libraries should use
+//! [`tracing`] to publish `tracing` `Event`s.
+//!
+//! # Configuration
+//!
+//! You can configure a subscriber instead of using the defaults with
+//! the following functions:
+//!
+//! ### Subscriber
+//!
+//! The [`FmtSubscriber`] formats and records `tracing` events as line-oriented logs.
+//! You can create one by calling:
+//!
+//! ```rust
+//! let subscriber = tracing_subscriber::fmt()
+//! // ... add configuration
+//! .finish();
+//! ```
+//!
+//! You can find the configuration methods for [`FmtSubscriber`] in
+//! [`SubscriberBuilder`].
+//!
+//! ## Formatters
+//!
+//! The output format used by the layer and subscriber in this module is
+//! represented by implementing the [`FormatEvent`] trait, and can be
+//! customized. This module provides a number of formatter implementations:
+//!
+//! * [`format::Full`]: The default formatter. This emits human-readable,
+//! single-line logs for each event that occurs, with the current span context
+//! displayed before the formatted representation of the event.
+//!
+//! For example:
+//! <pre><font color="#4E9A06"><b> Finished</b></font> dev [unoptimized + debuginfo] target(s) in 1.59s
+//! <font color="#4E9A06"><b> Running</b></font> `target/debug/examples/fmt`
+//! <font color="#AAAAAA">Oct 24 12:55:47.814 </font><font color="#4E9A06"> INFO</font> fmt: preparing to shave yaks number_of_yaks=3
+//! <font color="#AAAAAA">Oct 24 12:55:47.814 </font><font color="#4E9A06"> INFO</font> <b>shaving_yaks{</b>yaks=3<b>}</b>: fmt::yak_shave: shaving yaks
+//! <font color="#AAAAAA">Oct 24 12:55:47.814 </font><font color="#75507B">TRACE</font> <b>shaving_yaks{</b>yaks=3<b>}</b>:<b>shave{</b>yak=1<b>}</b>: fmt::yak_shave: hello! I&apos;m gonna shave a yak excitement=&quot;yay!&quot;
+//! <font color="#AAAAAA">Oct 24 12:55:47.814 </font><font color="#75507B">TRACE</font> <b>shaving_yaks{</b>yaks=3<b>}</b>:<b>shave{</b>yak=1<b>}</b>: fmt::yak_shave: yak shaved successfully
+//! <font color="#AAAAAA">Oct 24 12:55:47.814 </font><font color="#3465A4">DEBUG</font> <b>shaving_yaks{</b>yaks=3<b>}</b>: yak_events: yak=1 shaved=true
+//! <font color="#AAAAAA">Oct 24 12:55:47.814 </font><font color="#75507B">TRACE</font> <b>shaving_yaks{</b>yaks=3<b>}</b>: fmt::yak_shave: yaks_shaved=1
+//! <font color="#AAAAAA">Oct 24 12:55:47.815 </font><font color="#75507B">TRACE</font> <b>shaving_yaks{</b>yaks=3<b>}</b>:<b>shave{</b>yak=2<b>}</b>: fmt::yak_shave: hello! I&apos;m gonna shave a yak excitement=&quot;yay!&quot;
+//! <font color="#AAAAAA">Oct 24 12:55:47.815 </font><font color="#75507B">TRACE</font> <b>shaving_yaks{</b>yaks=3<b>}</b>:<b>shave{</b>yak=2<b>}</b>: fmt::yak_shave: yak shaved successfully
+//! <font color="#AAAAAA">Oct 24 12:55:47.815 </font><font color="#3465A4">DEBUG</font> <b>shaving_yaks{</b>yaks=3<b>}</b>: yak_events: yak=2 shaved=true
+//! <font color="#AAAAAA">Oct 24 12:55:47.815 </font><font color="#75507B">TRACE</font> <b>shaving_yaks{</b>yaks=3<b>}</b>: fmt::yak_shave: yaks_shaved=2
+//! <font color="#AAAAAA">Oct 24 12:55:47.815 </font><font color="#75507B">TRACE</font> <b>shaving_yaks{</b>yaks=3<b>}</b>:<b>shave{</b>yak=3<b>}</b>: fmt::yak_shave: hello! I&apos;m gonna shave a yak excitement=&quot;yay!&quot;
+//! <font color="#AAAAAA">Oct 24 12:55:47.815 </font><font color="#C4A000"> WARN</font> <b>shaving_yaks{</b>yaks=3<b>}</b>:<b>shave{</b>yak=3<b>}</b>: fmt::yak_shave: could not locate yak
+//! <font color="#AAAAAA">Oct 24 12:55:47.815 </font><font color="#3465A4">DEBUG</font> <b>shaving_yaks{</b>yaks=3<b>}</b>: yak_events: yak=3 shaved=false
+//! <font color="#AAAAAA">Oct 24 12:55:47.815 </font><font color="#CC0000">ERROR</font> <b>shaving_yaks{</b>yaks=3<b>}</b>: fmt::yak_shave: failed to shave yak yak=3 error=missing yak
+//! <font color="#AAAAAA">Oct 24 12:55:47.815 </font><font color="#75507B">TRACE</font> <b>shaving_yaks{</b>yaks=3<b>}</b>: fmt::yak_shave: yaks_shaved=2
+//! <font color="#AAAAAA">Oct 24 12:55:47.815 </font><font color="#4E9A06"> INFO</font> fmt: yak shaving completed all_yaks_shaved=false
+//! </pre>
+//!
+//! * [`format::Pretty`]: Emits excessively pretty, multi-line logs, optimized
+//! for human readability. This is primarily intended to be used in local
+//! development and debugging, or for command-line applications, where
+//! automated analysis and compact storage of logs is less of a priority than
+//! readability and visual appeal.
+//!
+//! For example:
+//! <pre><font color="#4E9A06"><b> Finished</b></font> dev [unoptimized + debuginfo] target(s) in 1.61s
+//! <font color="#4E9A06"><b> Running</b></font> `target/debug/examples/fmt-pretty`
+//! Oct 24 12:57:29.386 <font color="#4E9A06"><b>fmt_pretty</b></font><font color="#4E9A06">: preparing to shave yaks, </font><font color="#4E9A06"><b>number_of_yaks</b></font><font color="#4E9A06">: 3</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt-pretty.rs:16<font color="#AAAAAA"><i> on</i></font> main
+//!
+//! Oct 24 12:57:29.386 <font color="#4E9A06"><b>fmt_pretty::yak_shave</b></font><font color="#4E9A06">: shaving yaks</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:38<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#75507B"><b>fmt_pretty::yak_shave</b></font><font color="#75507B">: hello! I&apos;m gonna shave a yak, </font><font color="#75507B"><b>excitement</b></font><font color="#75507B">: &quot;yay!&quot;</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:14<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shave</b> <font color="#AAAAAA"><i>with</i></font> <b>yak</b>: 1
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#75507B"><b>fmt_pretty::yak_shave</b></font><font color="#75507B">: yak shaved successfully</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:22<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shave</b> <font color="#AAAAAA"><i>with</i></font> <b>yak</b>: 1
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#3465A4"><b>yak_events</b></font><font color="#3465A4">: </font><font color="#3465A4"><b>yak</b></font><font color="#3465A4">: 1, </font><font color="#3465A4"><b>shaved</b></font><font color="#3465A4">: true</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:43<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#75507B"><b>fmt_pretty::yak_shave</b></font><font color="#75507B">: </font><font color="#75507B"><b>yaks_shaved</b></font><font color="#75507B">: 1</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:52<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#75507B"><b>fmt_pretty::yak_shave</b></font><font color="#75507B">: hello! I&apos;m gonna shave a yak, </font><font color="#75507B"><b>excitement</b></font><font color="#75507B">: &quot;yay!&quot;</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:14<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shave</b> <font color="#AAAAAA"><i>with</i></font> <b>yak</b>: 2
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#75507B"><b>fmt_pretty::yak_shave</b></font><font color="#75507B">: yak shaved successfully</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:22<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shave</b> <font color="#AAAAAA"><i>with</i></font> <b>yak</b>: 2
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#3465A4"><b>yak_events</b></font><font color="#3465A4">: </font><font color="#3465A4"><b>yak</b></font><font color="#3465A4">: 2, </font><font color="#3465A4"><b>shaved</b></font><font color="#3465A4">: true</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:43<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#75507B"><b>fmt_pretty::yak_shave</b></font><font color="#75507B">: </font><font color="#75507B"><b>yaks_shaved</b></font><font color="#75507B">: 2</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:52<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#75507B"><b>fmt_pretty::yak_shave</b></font><font color="#75507B">: hello! I&apos;m gonna shave a yak, </font><font color="#75507B"><b>excitement</b></font><font color="#75507B">: &quot;yay!&quot;</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:14<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shave</b> <font color="#AAAAAA"><i>with</i></font> <b>yak</b>: 3
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#C4A000"><b>fmt_pretty::yak_shave</b></font><font color="#C4A000">: could not locate yak</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:16<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shave</b> <font color="#AAAAAA"><i>with</i></font> <b>yak</b>: 3
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#3465A4"><b>yak_events</b></font><font color="#3465A4">: </font><font color="#3465A4"><b>yak</b></font><font color="#3465A4">: 3, </font><font color="#3465A4"><b>shaved</b></font><font color="#3465A4">: false</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:43<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#CC0000"><b>fmt_pretty::yak_shave</b></font><font color="#CC0000">: failed to shave yak, </font><font color="#CC0000"><b>yak</b></font><font color="#CC0000">: 3, </font><font color="#CC0000"><b>error</b></font><font color="#CC0000">: missing yak</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:48<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#75507B"><b>fmt_pretty::yak_shave</b></font><font color="#75507B">: </font><font color="#75507B"><b>yaks_shaved</b></font><font color="#75507B">: 2</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt/yak_shave.rs:52<font color="#AAAAAA"><i> on</i></font> main
+//! <font color="#AAAAAA"><i>in</i></font> fmt_pretty::yak_shave::<b>shaving_yaks</b> <font color="#AAAAAA"><i>with</i></font> <b>yaks</b>: 3
+//!
+//! Oct 24 12:57:29.387 <font color="#4E9A06"><b>fmt_pretty</b></font><font color="#4E9A06">: yak shaving completed, </font><font color="#4E9A06"><b>all_yaks_shaved</b></font><font color="#4E9A06">: false</font>
+//! <font color="#AAAAAA"><i>at</i></font> examples/examples/fmt-pretty.rs:19<font color="#AAAAAA"><i> on</i></font> main
+//! </pre>
+//!
+//! * [`format::Json`]: Outputs newline-delimited JSON logs. This is intended
+//! for production use with systems where structured logs are consumed as JSON
+//! by analysis and viewing tools. The JSON output, as seen below, is *not*
+//! optimized for human readability.
+//!
+//! For example:
+//! <pre><font color="#4E9A06"><b> Finished</b></font> dev [unoptimized + debuginfo] target(s) in 1.58s
+//! <font color="#4E9A06"><b> Running</b></font> `target/debug/examples/fmt-json`
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.873&quot;,&quot;level&quot;:&quot;INFO&quot;,&quot;fields&quot;:{&quot;message&quot;:&quot;preparing to shave yaks&quot;,&quot;number_of_yaks&quot;:3},&quot;target&quot;:&quot;fmt_json&quot;}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.874&quot;,&quot;level&quot;:&quot;INFO&quot;,&quot;fields&quot;:{&quot;message&quot;:&quot;shaving yaks&quot;},&quot;target&quot;:&quot;fmt_json::yak_shave&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.874&quot;,&quot;level&quot;:&quot;TRACE&quot;,&quot;fields&quot;:{&quot;message&quot;:&quot;hello! I&apos;m gonna shave a yak&quot;,&quot;excitement&quot;:&quot;yay!&quot;},&quot;target&quot;:&quot;fmt_json::yak_shave&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;},{&quot;yak&quot;:&quot;1&quot;,&quot;name&quot;:&quot;shave&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.874&quot;,&quot;level&quot;:&quot;TRACE&quot;,&quot;fields&quot;:{&quot;message&quot;:&quot;yak shaved successfully&quot;},&quot;target&quot;:&quot;fmt_json::yak_shave&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;},{&quot;yak&quot;:&quot;1&quot;,&quot;name&quot;:&quot;shave&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.874&quot;,&quot;level&quot;:&quot;DEBUG&quot;,&quot;fields&quot;:{&quot;yak&quot;:1,&quot;shaved&quot;:true},&quot;target&quot;:&quot;yak_events&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.874&quot;,&quot;level&quot;:&quot;TRACE&quot;,&quot;fields&quot;:{&quot;yaks_shaved&quot;:1},&quot;target&quot;:&quot;fmt_json::yak_shave&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.874&quot;,&quot;level&quot;:&quot;TRACE&quot;,&quot;fields&quot;:{&quot;message&quot;:&quot;hello! I&apos;m gonna shave a yak&quot;,&quot;excitement&quot;:&quot;yay!&quot;},&quot;target&quot;:&quot;fmt_json::yak_shave&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;},{&quot;yak&quot;:&quot;2&quot;,&quot;name&quot;:&quot;shave&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.874&quot;,&quot;level&quot;:&quot;TRACE&quot;,&quot;fields&quot;:{&quot;message&quot;:&quot;yak shaved successfully&quot;},&quot;target&quot;:&quot;fmt_json::yak_shave&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;},{&quot;yak&quot;:&quot;2&quot;,&quot;name&quot;:&quot;shave&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.874&quot;,&quot;level&quot;:&quot;DEBUG&quot;,&quot;fields&quot;:{&quot;yak&quot;:2,&quot;shaved&quot;:true},&quot;target&quot;:&quot;yak_events&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.874&quot;,&quot;level&quot;:&quot;TRACE&quot;,&quot;fields&quot;:{&quot;yaks_shaved&quot;:2},&quot;target&quot;:&quot;fmt_json::yak_shave&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.874&quot;,&quot;level&quot;:&quot;TRACE&quot;,&quot;fields&quot;:{&quot;message&quot;:&quot;hello! I&apos;m gonna shave a yak&quot;,&quot;excitement&quot;:&quot;yay!&quot;},&quot;target&quot;:&quot;fmt_json::yak_shave&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;},{&quot;yak&quot;:&quot;3&quot;,&quot;name&quot;:&quot;shave&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.875&quot;,&quot;level&quot;:&quot;WARN&quot;,&quot;fields&quot;:{&quot;message&quot;:&quot;could not locate yak&quot;},&quot;target&quot;:&quot;fmt_json::yak_shave&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;},{&quot;yak&quot;:&quot;3&quot;,&quot;name&quot;:&quot;shave&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.875&quot;,&quot;level&quot;:&quot;DEBUG&quot;,&quot;fields&quot;:{&quot;yak&quot;:3,&quot;shaved&quot;:false},&quot;target&quot;:&quot;yak_events&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.875&quot;,&quot;level&quot;:&quot;ERROR&quot;,&quot;fields&quot;:{&quot;message&quot;:&quot;failed to shave yak&quot;,&quot;yak&quot;:3,&quot;error&quot;:&quot;missing yak&quot;},&quot;target&quot;:&quot;fmt_json::yak_shave&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.875&quot;,&quot;level&quot;:&quot;TRACE&quot;,&quot;fields&quot;:{&quot;yaks_shaved&quot;:2},&quot;target&quot;:&quot;fmt_json::yak_shave&quot;,&quot;spans&quot;:[{&quot;yaks&quot;:3,&quot;name&quot;:&quot;shaving_yaks&quot;}]}
+//! {&quot;timestamp&quot;:&quot;Oct 24 13:00:00.875&quot;,&quot;level&quot;:&quot;INFO&quot;,&quot;fields&quot;:{&quot;message&quot;:&quot;yak shaving completed&quot;,&quot;all_yaks_shaved&quot;:false},&quot;target&quot;:&quot;fmt_json&quot;}
+//! </pre>
+//!
+//! ### Customizing Formatters
+//!
+//! The formatting of log lines for spans and events is controlled by two
+//! traits, [`FormatEvent`] and [`FormatFields`]. The [`FormatEvent`] trait
+//! determines the overall formatting of the log line, such as what information
+//! from the event's metadata and span context is included and in what order.
+//! The [`FormatFields`] trait determines how fields &mdash; both the event's
+//! fields and fields on spans &mdash; are formatted.
+//!
+//! The [`fmt::format`] module provides several types which implement these traits,
+//! many of which expose additional configuration options to customize their
+//! output. The [`format::Format`] type implements common configuration used by
+//! all the formatters provided in this crate, and can be used as a builder to
+//! set specific formatting settings. For example:
+//!
+//! ```
+//! use tracing_subscriber::fmt;
+//!
+//! // Configure a custom event formatter
+//! let format = fmt::format()
+//! .with_level(false) // don't include levels in formatted output
+//! .with_target(false) // don't include targets
+//! .with_thread_ids(true) // include the thread ID of the current thread
+//! .with_thread_names(true) // include the name of the current thread
+//! .compact(); // use the `Compact` formatting style.
+//!
+//! // Create a `fmt` collector that uses our custom event format, and set it
+//! // as the default.
+//! tracing_subscriber::fmt()
+//! .event_format(format)
+//! .init();
+//! ```
+//!
+//! However, if a specific output format is needed, other crates can
+//! also implement [`FormatEvent`] and [`FormatFields`]. See those traits'
+//! documentation for details on how to implement them.
+//!
+//! ## Filters
+//!
+//! If you want to filter the `tracing` `Events` based on environment
+//! variables, you can use the [`EnvFilter`] as follows:
+//!
+//! ```rust
+//! use tracing_subscriber::EnvFilter;
+//!
+//! let filter = EnvFilter::from_default_env();
+//! ```
+//!
+//! As mentioned above, the [`EnvFilter`] allows `Span`s and `Event`s to
+//! be filtered at runtime by setting the `RUST_LOG` environment variable.
+//!
+//! You can find the other available [`filter`]s in the documentation.
+//!
+//! ### Using Your Subscriber
+//!
+//! Finally, once you have configured your `Subscriber`, you need to
+//! configure your executable to use it.
+//!
+//! A subscriber can be installed globally using:
+//! ```rust
+//! use tracing;
+//! use tracing_subscriber::FmtSubscriber;
+//!
+//! let subscriber = FmtSubscriber::new();
+//!
+//! tracing::subscriber::set_global_default(subscriber)
+//! .map_err(|_err| eprintln!("Unable to set global default subscriber"));
+//! // Note this will only fail if you try to set the global default
+//! // subscriber multiple times
+//! ```
+//!
+//! ### Composing Layers
+//!
+//! Composing an [`EnvFilter`] `Layer` and a [format `Layer`](../fmt/struct.Layer.html):
+//!
+//! ```rust
+//! use tracing_subscriber::{fmt, EnvFilter};
+//! use tracing_subscriber::prelude::*;
+//!
+//! let fmt_layer = fmt::layer()
+//! .with_target(false);
+//! let filter_layer = EnvFilter::try_from_default_env()
+//! .or_else(|_| EnvFilter::try_new("info"))
+//! .unwrap();
+//!
+//! tracing_subscriber::registry()
+//! .with(filter_layer)
+//! .with(fmt_layer)
+//! .init();
+//! ```
+//!
+//! [`EnvFilter`]: ../filter/struct.EnvFilter.html
+//! [`env_logger`]: https://docs.rs/env_logger/
+//! [`filter`]: ../filter/index.html
+//! [`SubscriberBuilder`]: ./struct.SubscriberBuilder.html
+//! [`FmtSubscriber`]: ./struct.Subscriber.html
+//! [`Subscriber`]:
+//! https://docs.rs/tracing/latest/tracing/trait.Subscriber.html
+//! [`tracing`]: https://crates.io/crates/tracing
+//! [`fmt::format`]: mod@crate::fmt::format
+use std::{any::TypeId, error::Error, io};
+use tracing_core::{span, subscriber::Interest, Event, Metadata};
+
+mod fmt_layer;
+#[cfg_attr(docsrs, doc(cfg(all(feature = "fmt", feature = "std"))))]
+pub mod format;
+#[cfg_attr(docsrs, doc(cfg(all(feature = "fmt", feature = "std"))))]
+pub mod time;
+#[cfg_attr(docsrs, doc(cfg(all(feature = "fmt", feature = "std"))))]
+pub mod writer;
+
+pub use fmt_layer::{FmtContext, FormattedFields, Layer};
+
+use crate::layer::Layer as _;
+use crate::{
+ filter::LevelFilter,
+ layer,
+ registry::{LookupSpan, Registry},
+};
+
+#[doc(inline)]
+pub use self::{
+ format::{format, FormatEvent, FormatFields},
+ time::time,
+ writer::{MakeWriter, TestWriter},
+};
+
+/// A `Subscriber` that logs formatted representations of `tracing` events.
+///
+/// This consists of an inner `Formatter` wrapped in a layer that performs filtering.
+#[cfg_attr(docsrs, doc(cfg(all(feature = "fmt", feature = "std"))))]
+#[derive(Debug)]
+pub struct Subscriber<
+ N = format::DefaultFields,
+ E = format::Format<format::Full>,
+ F = LevelFilter,
+ W = fn() -> io::Stdout,
+> {
+ inner: layer::Layered<F, Formatter<N, E, W>>,
+}
+
+/// A `Subscriber` that logs formatted representations of `tracing` events.
+/// This type only logs formatted events; it does not perform any filtering.
+#[cfg_attr(docsrs, doc(cfg(all(feature = "fmt", feature = "std"))))]
+pub type Formatter<
+ N = format::DefaultFields,
+ E = format::Format<format::Full>,
+ W = fn() -> io::Stdout,
+> = layer::Layered<fmt_layer::Layer<Registry, N, E, W>, Registry>;
+
+/// Configures and constructs `Subscriber`s.
+#[cfg_attr(docsrs, doc(cfg(all(feature = "fmt", feature = "std"))))]
+#[derive(Debug)]
+pub struct SubscriberBuilder<
+ N = format::DefaultFields,
+ E = format::Format<format::Full>,
+ F = LevelFilter,
+ W = fn() -> io::Stdout,
+> {
+ filter: F,
+ inner: Layer<Registry, N, E, W>,
+}
+
+/// Returns a new [`SubscriberBuilder`] for configuring a [formatting subscriber].
+///
+/// This is essentially shorthand for [`SubscriberBuilder::default()]`.
+///
+/// # Examples
+///
+/// Using [`init`] to set the default subscriber:
+///
+/// ```rust
+/// tracing_subscriber::fmt().init();
+/// ```
+///
+/// Configuring the output format:
+///
+/// ```rust
+///
+/// tracing_subscriber::fmt()
+/// // Configure formatting settings.
+/// .with_target(false)
+/// .with_timer(tracing_subscriber::fmt::time::uptime())
+/// .with_level(true)
+/// // Set the subscriber as the default.
+/// .init();
+/// ```
+///
+/// [`try_init`] returns an error if the default subscriber could not be set:
+///
+/// ```rust
+/// use std::error::Error;
+///
+/// fn init_subscriber() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
+/// tracing_subscriber::fmt()
+/// // Configure the subscriber to emit logs in JSON format.
+/// .json()
+/// // Configure the subscriber to flatten event fields in the output JSON objects.
+/// .flatten_event(true)
+/// // Set the subscriber as the default, returning an error if this fails.
+/// .try_init()?;
+///
+/// Ok(())
+/// }
+/// ```
+///
+/// Rather than setting the subscriber as the default, [`finish`] _returns_ the
+/// constructed subscriber, which may then be passed to other functions:
+///
+/// ```rust
+/// let subscriber = tracing_subscriber::fmt()
+/// .with_max_level(tracing::Level::DEBUG)
+/// .compact()
+/// .finish();
+///
+/// tracing::subscriber::with_default(subscriber, || {
+/// // the subscriber will only be set as the default
+/// // inside this closure...
+/// })
+/// ```
+///
+/// [formatting subscriber]: Subscriber
+/// [`SubscriberBuilder::default()`]: SubscriberBuilder::default()
+/// [`init`]: SubscriberBuilder::init()
+/// [`try_init`]: SubscriberBuilder::try_init()
+/// [`finish`]: SubscriberBuilder::finish()
+#[cfg_attr(docsrs, doc(cfg(all(feature = "fmt", feature = "std"))))]
+pub fn fmt() -> SubscriberBuilder {
+ SubscriberBuilder::default()
+}
+
+/// Returns a new [formatting layer] that can be [composed] with other layers to
+/// construct a [`Subscriber`].
+///
+/// This is a shorthand for the equivalent [`Layer::default`] function.
+///
+/// [formatting layer]: Layer
+/// [composed]: crate::layer
+#[cfg_attr(docsrs, doc(cfg(all(feature = "fmt", feature = "std"))))]
+pub fn layer<S>() -> Layer<S> {
+ Layer::default()
+}
+
+impl Subscriber {
+ /// The maximum [verbosity level] that is enabled by a `Subscriber` by
+ /// default.
+ ///
+ /// This can be overridden with the [`SubscriberBuilder::with_max_level`] method.
+ ///
+ /// [verbosity level]: https://docs.rs/tracing-core/0.1.5/tracing_core/struct.Level.html
+ /// [`SubscriberBuilder::with_max_level`]: struct.SubscriberBuilder.html#method.with_max_level
+ pub const DEFAULT_MAX_LEVEL: LevelFilter = LevelFilter::INFO;
+
+ /// Returns a new `SubscriberBuilder` for configuring a format subscriber.
+ pub fn builder() -> SubscriberBuilder {
+ SubscriberBuilder::default()
+ }
+
+ /// Returns a new format subscriber with the default configuration.
+ pub fn new() -> Self {
+ Default::default()
+ }
+}
+
+impl Default for Subscriber {
+ fn default() -> Self {
+ SubscriberBuilder::default().finish()
+ }
+}
+
+// === impl Subscriber ===
+
+impl<N, E, F, W> tracing_core::Subscriber for Subscriber<N, E, F, W>
+where
+ N: for<'writer> FormatFields<'writer> + 'static,
+ E: FormatEvent<Registry, N> + 'static,
+ F: layer::Layer<Formatter<N, E, W>> + 'static,
+ W: for<'writer> MakeWriter<'writer> + 'static,
+ layer::Layered<F, Formatter<N, E, W>>: tracing_core::Subscriber,
+ fmt_layer::Layer<Registry, N, E, W>: layer::Layer<Registry>,
+{
+ #[inline]
+ fn register_callsite(&self, meta: &'static Metadata<'static>) -> Interest {
+ self.inner.register_callsite(meta)
+ }
+
+ #[inline]
+ fn enabled(&self, meta: &Metadata<'_>) -> bool {
+ self.inner.enabled(meta)
+ }
+
+ #[inline]
+ fn new_span(&self, attrs: &span::Attributes<'_>) -> span::Id {
+ self.inner.new_span(attrs)
+ }
+
+ #[inline]
+ fn record(&self, span: &span::Id, values: &span::Record<'_>) {
+ self.inner.record(span, values)
+ }
+
+ #[inline]
+ fn record_follows_from(&self, span: &span::Id, follows: &span::Id) {
+ self.inner.record_follows_from(span, follows)
+ }
+
+ #[inline]
+ fn event(&self, event: &Event<'_>) {
+ self.inner.event(event);
+ }
+
+ #[inline]
+ fn enter(&self, id: &span::Id) {
+ // TODO: add on_enter hook
+ self.inner.enter(id);
+ }
+
+ #[inline]
+ fn exit(&self, id: &span::Id) {
+ self.inner.exit(id);
+ }
+
+ #[inline]
+ fn current_span(&self) -> span::Current {
+ self.inner.current_span()
+ }
+
+ #[inline]
+ fn clone_span(&self, id: &span::Id) -> span::Id {
+ self.inner.clone_span(id)
+ }
+
+ #[inline]
+ fn try_close(&self, id: span::Id) -> bool {
+ self.inner.try_close(id)
+ }
+
+ #[inline]
+ fn max_level_hint(&self) -> Option<tracing_core::LevelFilter> {
+ self.inner.max_level_hint()
+ }
+
+ unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()> {
+ if id == TypeId::of::<Self>() {
+ Some(self as *const Self as *const ())
+ } else {
+ self.inner.downcast_raw(id)
+ }
+ }
+}
+
+impl<'a, N, E, F, W> LookupSpan<'a> for Subscriber<N, E, F, W>
+where
+ layer::Layered<F, Formatter<N, E, W>>: LookupSpan<'a>,
+{
+ type Data = <layer::Layered<F, Formatter<N, E, W>> as LookupSpan<'a>>::Data;
+
+ fn span_data(&'a self, id: &span::Id) -> Option<Self::Data> {
+ self.inner.span_data(id)
+ }
+}
+
+// ===== impl SubscriberBuilder =====
+
+impl Default for SubscriberBuilder {
+ fn default() -> Self {
+ SubscriberBuilder {
+ filter: Subscriber::DEFAULT_MAX_LEVEL,
+ inner: Default::default(),
+ }
+ }
+}
+
+impl<N, E, F, W> SubscriberBuilder<N, E, F, W>
+where
+ N: for<'writer> FormatFields<'writer> + 'static,
+ E: FormatEvent<Registry, N> + 'static,
+ W: for<'writer> MakeWriter<'writer> + 'static,
+ F: layer::Layer<Formatter<N, E, W>> + Send + Sync + 'static,
+ fmt_layer::Layer<Registry, N, E, W>: layer::Layer<Registry> + Send + Sync + 'static,
+{
+ /// Finish the builder, returning a new `FmtSubscriber`.
+ pub fn finish(self) -> Subscriber<N, E, F, W> {
+ let subscriber = self.inner.with_subscriber(Registry::default());
+ Subscriber {
+ inner: self.filter.with_subscriber(subscriber),
+ }
+ }
+
+ /// Install this Subscriber as the global default if one is
+ /// not already set.
+ ///
+ /// If the `tracing-log` feature is enabled, this will also install
+ /// the LogTracer to convert `Log` records into `tracing` `Event`s.
+ ///
+ /// # Errors
+ /// Returns an Error if the initialization was unsuccessful, likely
+ /// because a global subscriber was already installed by another
+ /// call to `try_init`.
+ pub fn try_init(self) -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
+ use crate::util::SubscriberInitExt;
+ self.finish().try_init()?;
+
+ Ok(())
+ }
+
+ /// Install this Subscriber as the global default.
+ ///
+ /// If the `tracing-log` feature is enabled, this will also install
+ /// the LogTracer to convert `Log` records into `tracing` `Event`s.
+ ///
+ /// # Panics
+ /// Panics if the initialization was unsuccessful, likely because a
+ /// global subscriber was already installed by another call to `try_init`.
+ pub fn init(self) {
+ self.try_init()
+ .expect("Unable to install global subscriber")
+ }
+}
+
+impl<N, E, F, W> From<SubscriberBuilder<N, E, F, W>> for tracing_core::Dispatch
+where
+ N: for<'writer> FormatFields<'writer> + 'static,
+ E: FormatEvent<Registry, N> + 'static,
+ W: for<'writer> MakeWriter<'writer> + 'static,
+ F: layer::Layer<Formatter<N, E, W>> + Send + Sync + 'static,
+ fmt_layer::Layer<Registry, N, E, W>: layer::Layer<Registry> + Send + Sync + 'static,
+{
+ fn from(builder: SubscriberBuilder<N, E, F, W>) -> tracing_core::Dispatch {
+ tracing_core::Dispatch::new(builder.finish())
+ }
+}
+
+impl<N, L, T, F, W> SubscriberBuilder<N, format::Format<L, T>, F, W>
+where
+ N: for<'writer> FormatFields<'writer> + 'static,
+{
+ /// Use the given [`timer`] for log message timestamps.
+ ///
+ /// See the [`time` module] for the provided timer implementations.
+ ///
+ /// Note that using the `"time`"" feature flag enables the
+ /// additional time formatters [`UtcTime`] and [`LocalTime`], which use the
+ /// [`time` crate] to provide more sophisticated timestamp formatting
+ /// options.
+ ///
+ /// [`timer`]: time::FormatTime
+ /// [`time` module]: mod@time
+ /// [`UtcTime`]: time::UtcTime
+ /// [`LocalTime`]: time::LocalTime
+ /// [`time` crate]: https://docs.rs/time/0.3
+ pub fn with_timer<T2>(self, timer: T2) -> SubscriberBuilder<N, format::Format<L, T2>, F, W> {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.with_timer(timer),
+ }
+ }
+
+ /// Do not emit timestamps with log messages.
+ pub fn without_time(self) -> SubscriberBuilder<N, format::Format<L, ()>, F, W> {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.without_time(),
+ }
+ }
+
+ /// Configures how synthesized events are emitted at points in the [span
+ /// lifecycle][lifecycle].
+ ///
+ /// The following options are available:
+ ///
+ /// - `FmtSpan::NONE`: No events will be synthesized when spans are
+ /// created, entered, exited, or closed. Data from spans will still be
+ /// included as the context for formatted events. This is the default.
+ /// - `FmtSpan::NEW`: An event will be synthesized when spans are created.
+ /// - `FmtSpan::ENTER`: An event will be synthesized when spans are entered.
+ /// - `FmtSpan::EXIT`: An event will be synthesized when spans are exited.
+ /// - `FmtSpan::CLOSE`: An event will be synthesized when a span closes. If
+ /// [timestamps are enabled][time] for this formatter, the generated
+ /// event will contain fields with the span's _busy time_ (the total
+ /// time for which it was entered) and _idle time_ (the total time that
+ /// the span existed but was not entered).
+ /// - `FmtSpan::ACTIVE`: An event will be synthesized when spans are entered
+ /// or exited.
+ /// - `FmtSpan::FULL`: Events will be synthesized whenever a span is
+ /// created, entered, exited, or closed. If timestamps are enabled, the
+ /// close event will contain the span's busy and idle time, as
+ /// described above.
+ ///
+ /// The options can be enabled in any combination. For instance, the following
+ /// will synthesize events whenever spans are created and closed:
+ ///
+ /// ```rust
+ /// use tracing_subscriber::fmt::format::FmtSpan;
+ /// use tracing_subscriber::fmt;
+ ///
+ /// let subscriber = fmt()
+ /// .with_span_events(FmtSpan::NEW | FmtSpan::CLOSE)
+ /// .finish();
+ /// ```
+ ///
+ /// Note that the generated events will only be part of the log output by
+ /// this formatter; they will not be recorded by other `Subscriber`s or by
+ /// `Layer`s added to this subscriber.
+ ///
+ /// [lifecycle]: https://docs.rs/tracing/latest/tracing/span/index.html#the-span-lifecycle
+ /// [time]: #method.without_time
+ pub fn with_span_events(self, kind: format::FmtSpan) -> Self {
+ SubscriberBuilder {
+ inner: self.inner.with_span_events(kind),
+ ..self
+ }
+ }
+
+ /// Enable ANSI encoding for formatted events.
+ #[cfg(feature = "ansi")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "ansi")))]
+ pub fn with_ansi(self, ansi: bool) -> SubscriberBuilder<N, format::Format<L, T>, F, W> {
+ SubscriberBuilder {
+ inner: self.inner.with_ansi(ansi),
+ ..self
+ }
+ }
+
+ /// Sets whether or not an event's target is displayed.
+ pub fn with_target(
+ self,
+ display_target: bool,
+ ) -> SubscriberBuilder<N, format::Format<L, T>, F, W> {
+ SubscriberBuilder {
+ inner: self.inner.with_target(display_target),
+ ..self
+ }
+ }
+
+ /// Sets whether or not an event's level is displayed.
+ pub fn with_level(
+ self,
+ display_level: bool,
+ ) -> SubscriberBuilder<N, format::Format<L, T>, F, W> {
+ SubscriberBuilder {
+ inner: self.inner.with_level(display_level),
+ ..self
+ }
+ }
+
+ /// Sets whether or not the [name] of the current thread is displayed
+ /// when formatting events
+ ///
+ /// [name]: https://doc.rust-lang.org/stable/std/thread/index.html#naming-threads
+ pub fn with_thread_names(
+ self,
+ display_thread_names: bool,
+ ) -> SubscriberBuilder<N, format::Format<L, T>, F, W> {
+ SubscriberBuilder {
+ inner: self.inner.with_thread_names(display_thread_names),
+ ..self
+ }
+ }
+
+ /// Sets whether or not the [thread ID] of the current thread is displayed
+ /// when formatting events
+ ///
+ /// [thread ID]: https://doc.rust-lang.org/stable/std/thread/struct.ThreadId.html
+ pub fn with_thread_ids(
+ self,
+ display_thread_ids: bool,
+ ) -> SubscriberBuilder<N, format::Format<L, T>, F, W> {
+ SubscriberBuilder {
+ inner: self.inner.with_thread_ids(display_thread_ids),
+ ..self
+ }
+ }
+
+ /// Sets the subscriber being built to use a less verbose formatter.
+ ///
+ /// See [`format::Compact`].
+ pub fn compact(self) -> SubscriberBuilder<N, format::Format<format::Compact, T>, F, W>
+ where
+ N: for<'writer> FormatFields<'writer> + 'static,
+ {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.compact(),
+ }
+ }
+
+ /// Sets the subscriber being built to use an [excessively pretty, human-readable formatter](crate::fmt::format::Pretty).
+ #[cfg(feature = "ansi")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "ansi")))]
+ pub fn pretty(
+ self,
+ ) -> SubscriberBuilder<format::Pretty, format::Format<format::Pretty, T>, F, W> {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.pretty(),
+ }
+ }
+
+ /// Sets the subscriber being built to use a JSON formatter.
+ ///
+ /// See [`format::Json`](../fmt/format/struct.Json.html)
+ #[cfg(feature = "json")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+ pub fn json(
+ self,
+ ) -> SubscriberBuilder<format::JsonFields, format::Format<format::Json, T>, F, W>
+ where
+ N: for<'writer> FormatFields<'writer> + 'static,
+ {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.json(),
+ }
+ }
+}
+
+#[cfg(feature = "json")]
+#[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+impl<T, F, W> SubscriberBuilder<format::JsonFields, format::Format<format::Json, T>, F, W> {
+ /// Sets the json subscriber being built to flatten event metadata.
+ ///
+ /// See [`format::Json`](../fmt/format/struct.Json.html)
+ pub fn flatten_event(
+ self,
+ flatten_event: bool,
+ ) -> SubscriberBuilder<format::JsonFields, format::Format<format::Json, T>, F, W> {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.flatten_event(flatten_event),
+ }
+ }
+
+ /// Sets whether or not the JSON subscriber being built will include the current span
+ /// in formatted events.
+ ///
+ /// See [`format::Json`](../fmt/format/struct.Json.html)
+ pub fn with_current_span(
+ self,
+ display_current_span: bool,
+ ) -> SubscriberBuilder<format::JsonFields, format::Format<format::Json, T>, F, W> {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.with_current_span(display_current_span),
+ }
+ }
+
+ /// Sets whether or not the JSON subscriber being built will include a list (from
+ /// root to leaf) of all currently entered spans in formatted events.
+ ///
+ /// See [`format::Json`](../fmt/format/struct.Json.html)
+ pub fn with_span_list(
+ self,
+ display_span_list: bool,
+ ) -> SubscriberBuilder<format::JsonFields, format::Format<format::Json, T>, F, W> {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.with_span_list(display_span_list),
+ }
+ }
+}
+
+#[cfg(feature = "env-filter")]
+#[cfg_attr(docsrs, doc(cfg(feature = "env-filter")))]
+impl<N, E, W> SubscriberBuilder<N, E, crate::EnvFilter, W>
+where
+ Formatter<N, E, W>: tracing_core::Subscriber + 'static,
+{
+ /// Configures the subscriber being built to allow filter reloading at
+ /// runtime.
+ pub fn with_filter_reloading(
+ self,
+ ) -> SubscriberBuilder<N, E, crate::reload::Layer<crate::EnvFilter, Formatter<N, E, W>>, W>
+ {
+ let (filter, _) = crate::reload::Layer::new(self.filter);
+ SubscriberBuilder {
+ filter,
+ inner: self.inner,
+ }
+ }
+}
+
+#[cfg(feature = "env-filter")]
+#[cfg_attr(docsrs, doc(cfg(feature = "env-filter")))]
+impl<N, E, W> SubscriberBuilder<N, E, crate::reload::Layer<crate::EnvFilter, Formatter<N, E, W>>, W>
+where
+ Formatter<N, E, W>: tracing_core::Subscriber + 'static,
+{
+ /// Returns a `Handle` that may be used to reload the constructed subscriber's
+ /// filter.
+ pub fn reload_handle(&self) -> crate::reload::Handle<crate::EnvFilter, Formatter<N, E, W>> {
+ self.filter.handle()
+ }
+}
+
+impl<N, E, F, W> SubscriberBuilder<N, E, F, W> {
+ /// Sets the Visitor that the subscriber being built will use to record
+ /// fields.
+ ///
+ /// For example:
+ /// ```rust
+ /// use tracing_subscriber::fmt::format;
+ /// use tracing_subscriber::prelude::*;
+ ///
+ /// let formatter =
+ /// // Construct a custom formatter for `Debug` fields
+ /// format::debug_fn(|writer, field, value| write!(writer, "{}: {:?}", field, value))
+ /// // Use the `tracing_subscriber::MakeFmtExt` trait to wrap the
+ /// // formatter so that a delimiter is added between fields.
+ /// .delimited(", ");
+ ///
+ /// let subscriber = tracing_subscriber::fmt()
+ /// .fmt_fields(formatter)
+ /// .finish();
+ /// # drop(subscriber)
+ /// ```
+ pub fn fmt_fields<N2>(self, fmt_fields: N2) -> SubscriberBuilder<N2, E, F, W>
+ where
+ N2: for<'writer> FormatFields<'writer> + 'static,
+ {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.fmt_fields(fmt_fields),
+ }
+ }
+
+ /// Sets the [`EnvFilter`] that the subscriber will use to determine if
+ /// a span or event is enabled.
+ ///
+ /// Note that this method requires the "env-filter" feature flag to be enabled.
+ ///
+ /// If a filter was previously set, or a maximum level was set by the
+ /// [`with_max_level`] method, that value is replaced by the new filter.
+ ///
+ /// # Examples
+ ///
+ /// Setting a filter based on the value of the `RUST_LOG` environment
+ /// variable:
+ /// ```rust
+ /// use tracing_subscriber::{fmt, EnvFilter};
+ ///
+ /// fmt()
+ /// .with_env_filter(EnvFilter::from_default_env())
+ /// .init();
+ /// ```
+ ///
+ /// Setting a filter based on a pre-set filter directive string:
+ /// ```rust
+ /// use tracing_subscriber::fmt;
+ ///
+ /// fmt()
+ /// .with_env_filter("my_crate=info,my_crate::my_mod=debug,[my_span]=trace")
+ /// .init();
+ /// ```
+ ///
+ /// Adding additional directives to a filter constructed from an env var:
+ /// ```rust
+ /// use tracing_subscriber::{fmt, filter::{EnvFilter, LevelFilter}};
+ ///
+ /// # fn filter() -> Result<(), Box<dyn std::error::Error + Send + Sync + 'static>> {
+ /// let filter = EnvFilter::try_from_env("MY_CUSTOM_FILTER_ENV_VAR")?
+ /// // Set the base level when not matched by other directives to WARN.
+ /// .add_directive(LevelFilter::WARN.into())
+ /// // Set the max level for `my_crate::my_mod` to DEBUG, overriding
+ /// // any directives parsed from the env variable.
+ /// .add_directive("my_crate::my_mod=debug".parse()?);
+ ///
+ /// fmt()
+ /// .with_env_filter(filter)
+ /// .try_init()?;
+ /// # Ok(())}
+ /// ```
+ /// [`EnvFilter`]: ../filter/struct.EnvFilter.html
+ /// [`with_max_level`]: #method.with_max_level
+ #[cfg(feature = "env-filter")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "env-filter")))]
+ pub fn with_env_filter(
+ self,
+ filter: impl Into<crate::EnvFilter>,
+ ) -> SubscriberBuilder<N, E, crate::EnvFilter, W>
+ where
+ Formatter<N, E, W>: tracing_core::Subscriber + 'static,
+ {
+ let filter = filter.into();
+ SubscriberBuilder {
+ filter,
+ inner: self.inner,
+ }
+ }
+
+ /// Sets the maximum [verbosity level] that will be enabled by the
+ /// subscriber.
+ ///
+ /// If the max level has already been set, or a [`EnvFilter`] was added by
+ /// [`with_filter`], this replaces that configuration with the new
+ /// maximum level.
+ ///
+ /// # Examples
+ ///
+ /// Enable up to the `DEBUG` verbosity level:
+ /// ```rust
+ /// use tracing_subscriber::fmt;
+ /// use tracing::Level;
+ ///
+ /// fmt()
+ /// .with_max_level(Level::DEBUG)
+ /// .init();
+ /// ```
+ /// This subscriber won't record any spans or events!
+ /// ```rust
+ /// use tracing_subscriber::{fmt, filter::LevelFilter};
+ ///
+ /// let subscriber = fmt()
+ /// .with_max_level(LevelFilter::OFF)
+ /// .finish();
+ /// ```
+ /// [verbosity level]: https://docs.rs/tracing-core/0.1.5/tracing_core/struct.Level.html
+ /// [`EnvFilter`]: ../filter/struct.EnvFilter.html
+ /// [`with_filter`]: #method.with_filter
+ pub fn with_max_level(
+ self,
+ filter: impl Into<LevelFilter>,
+ ) -> SubscriberBuilder<N, E, LevelFilter, W> {
+ let filter = filter.into();
+ SubscriberBuilder {
+ filter,
+ inner: self.inner,
+ }
+ }
+
+ /// Sets the function that the subscriber being built should use to format
+ /// events that occur.
+ pub fn event_format<E2>(self, fmt_event: E2) -> SubscriberBuilder<N, E2, F, W>
+ where
+ E2: FormatEvent<Registry, N> + 'static,
+ N: for<'writer> FormatFields<'writer> + 'static,
+ W: for<'writer> MakeWriter<'writer> + 'static,
+ {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.event_format(fmt_event),
+ }
+ }
+
+ /// Sets the [`MakeWriter`] that the subscriber being built will use to write events.
+ ///
+ /// # Examples
+ ///
+ /// Using `stderr` rather than `stdout`:
+ ///
+ /// ```rust
+ /// use tracing_subscriber::fmt;
+ /// use std::io;
+ ///
+ /// fmt()
+ /// .with_writer(io::stderr)
+ /// .init();
+ /// ```
+ ///
+ /// [`MakeWriter`]: trait.MakeWriter.html
+ pub fn with_writer<W2>(self, make_writer: W2) -> SubscriberBuilder<N, E, F, W2>
+ where
+ W2: for<'writer> MakeWriter<'writer> + 'static,
+ {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.with_writer(make_writer),
+ }
+ }
+
+ /// Configures the subscriber to support [`libtest`'s output capturing][capturing] when used in
+ /// unit tests.
+ ///
+ /// See [`TestWriter`] for additional details.
+ ///
+ /// # Examples
+ ///
+ /// Using [`TestWriter`] to let `cargo test` capture test output. Note that we do not install it
+ /// globally as it may cause conflicts.
+ ///
+ /// ```rust
+ /// use tracing_subscriber::fmt;
+ /// use tracing::subscriber;
+ ///
+ /// subscriber::set_default(
+ /// fmt()
+ /// .with_test_writer()
+ /// .finish()
+ /// );
+ /// ```
+ ///
+ /// [capturing]:
+ /// https://doc.rust-lang.org/book/ch11-02-running-tests.html#showing-function-output
+ /// [`TestWriter`]: writer/struct.TestWriter.html
+ pub fn with_test_writer(self) -> SubscriberBuilder<N, E, F, TestWriter> {
+ SubscriberBuilder {
+ filter: self.filter,
+ inner: self.inner.with_writer(TestWriter::default()),
+ }
+ }
+}
+
+/// Install a global tracing subscriber that listens for events and
+/// filters based on the value of the [`RUST_LOG` environment variable],
+/// if one is not already set.
+///
+/// If the `tracing-log` feature is enabled, this will also install
+/// the [`LogTracer`] to convert `log` records into `tracing` `Event`s.
+///
+/// This is shorthand for
+///
+/// ```rust
+/// # fn doc() -> Result<(), Box<dyn std::error::Error + Send + Sync + 'static>> {
+/// tracing_subscriber::fmt().try_init()
+/// # }
+/// ```
+///
+///
+/// # Errors
+///
+/// Returns an Error if the initialization was unsuccessful,
+/// likely because a global subscriber was already installed by another
+/// call to `try_init`.
+///
+/// [`LogTracer`]:
+/// https://docs.rs/tracing-log/0.1.0/tracing_log/struct.LogTracer.html
+/// [`RUST_LOG` environment variable]:
+/// ../filter/struct.EnvFilter.html#associatedconstant.DEFAULT_ENV
+pub fn try_init() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
+ let builder = Subscriber::builder();
+
+ #[cfg(feature = "env-filter")]
+ let builder = builder.with_env_filter(crate::EnvFilter::from_default_env());
+
+ builder.try_init()
+}
+
+/// Install a global tracing subscriber that listens for events and
+/// filters based on the value of the [`RUST_LOG` environment variable].
+///
+/// If the `tracing-log` feature is enabled, this will also install
+/// the LogTracer to convert `Log` records into `tracing` `Event`s.
+///
+/// This is shorthand for
+///
+/// ```rust
+/// tracing_subscriber::fmt().init()
+/// ```
+///
+/// # Panics
+/// Panics if the initialization was unsuccessful, likely because a
+/// global subscriber was already installed by another call to `try_init`.
+///
+/// [`RUST_LOG` environment variable]:
+/// ../filter/struct.EnvFilter.html#associatedconstant.DEFAULT_ENV
+pub fn init() {
+ try_init().expect("Unable to install global subscriber")
+}
+
+#[cfg(test)]
+mod test {
+ use crate::{
+ filter::LevelFilter,
+ fmt::{
+ format::{self, Format},
+ time,
+ writer::MakeWriter,
+ Subscriber,
+ },
+ };
+ use std::{
+ io,
+ sync::{Arc, Mutex, MutexGuard, TryLockError},
+ };
+ use tracing_core::dispatcher::Dispatch;
+
+ pub(crate) struct MockWriter {
+ buf: Arc<Mutex<Vec<u8>>>,
+ }
+
+ impl MockWriter {
+ pub(crate) fn new(buf: Arc<Mutex<Vec<u8>>>) -> Self {
+ Self { buf }
+ }
+
+ pub(crate) fn map_error<Guard>(err: TryLockError<Guard>) -> io::Error {
+ match err {
+ TryLockError::WouldBlock => io::Error::from(io::ErrorKind::WouldBlock),
+ TryLockError::Poisoned(_) => io::Error::from(io::ErrorKind::Other),
+ }
+ }
+
+ pub(crate) fn buf(&self) -> io::Result<MutexGuard<'_, Vec<u8>>> {
+ self.buf.try_lock().map_err(Self::map_error)
+ }
+ }
+
+ impl io::Write for MockWriter {
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ self.buf()?.write(buf)
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ self.buf()?.flush()
+ }
+ }
+
+ #[derive(Clone, Default)]
+ pub(crate) struct MockMakeWriter {
+ buf: Arc<Mutex<Vec<u8>>>,
+ }
+
+ impl MockMakeWriter {
+ pub(crate) fn new(buf: Arc<Mutex<Vec<u8>>>) -> Self {
+ Self { buf }
+ }
+
+ #[cfg(feature = "json")]
+ pub(crate) fn buf(&self) -> MutexGuard<'_, Vec<u8>> {
+ self.buf.lock().unwrap()
+ }
+
+ pub(crate) fn get_string(&self) -> String {
+ let mut buf = self.buf.lock().expect("lock shouldn't be poisoned");
+ let string = std::str::from_utf8(&buf[..])
+ .expect("formatter should not have produced invalid utf-8")
+ .to_owned();
+ buf.clear();
+ string
+ }
+ }
+
+ impl<'a> MakeWriter<'a> for MockMakeWriter {
+ type Writer = MockWriter;
+
+ fn make_writer(&'a self) -> Self::Writer {
+ MockWriter::new(self.buf.clone())
+ }
+ }
+
+ #[test]
+ fn impls() {
+ let f = Format::default().with_timer(time::Uptime::default());
+ let subscriber = Subscriber::builder().event_format(f).finish();
+ let _dispatch = Dispatch::new(subscriber);
+
+ let f = format::Format::default();
+ let subscriber = Subscriber::builder().event_format(f).finish();
+ let _dispatch = Dispatch::new(subscriber);
+
+ let f = format::Format::default().compact();
+ let subscriber = Subscriber::builder().event_format(f).finish();
+ let _dispatch = Dispatch::new(subscriber);
+ }
+
+ #[test]
+ fn subscriber_downcasts() {
+ let subscriber = Subscriber::builder().finish();
+ let dispatch = Dispatch::new(subscriber);
+ assert!(dispatch.downcast_ref::<Subscriber>().is_some());
+ }
+
+ #[test]
+ fn subscriber_downcasts_to_parts() {
+ let subscriber = Subscriber::new();
+ let dispatch = Dispatch::new(subscriber);
+ assert!(dispatch.downcast_ref::<format::DefaultFields>().is_some());
+ assert!(dispatch.downcast_ref::<LevelFilter>().is_some());
+ assert!(dispatch.downcast_ref::<format::Format>().is_some())
+ }
+
+ #[test]
+ fn is_lookup_span() {
+ fn assert_lookup_span<T: for<'a> crate::registry::LookupSpan<'a>>(_: T) {}
+ let subscriber = Subscriber::new();
+ assert_lookup_span(subscriber)
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/fmt/time/datetime.rs b/vendor/tracing-subscriber-0.3.3/src/fmt/time/datetime.rs
new file mode 100644
index 000000000..531331687
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/fmt/time/datetime.rs
@@ -0,0 +1,410 @@
+// musl as a whole is licensed under the following standard MIT license:
+//
+// ----------------------------------------------------------------------
+// Copyright © 2005-2020 Rich Felker, et al.
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+// ----------------------------------------------------------------------
+//
+// Authors/contributors include:
+//
+// A. Wilcox
+// Ada Worcester
+// Alex Dowad
+// Alex Suykov
+// Alexander Monakov
+// Andre McCurdy
+// Andrew Kelley
+// Anthony G. Basile
+// Aric Belsito
+// Arvid Picciani
+// Bartosz Brachaczek
+// Benjamin Peterson
+// Bobby Bingham
+// Boris Brezillon
+// Brent Cook
+// Chris Spiegel
+// Clément Vasseur
+// Daniel Micay
+// Daniel Sabogal
+// Daurnimator
+// David Carlier
+// David Edelsohn
+// Denys Vlasenko
+// Dmitry Ivanov
+// Dmitry V. Levin
+// Drew DeVault
+// Emil Renner Berthing
+// Fangrui Song
+// Felix Fietkau
+// Felix Janda
+// Gianluca Anzolin
+// Hauke Mehrtens
+// He X
+// Hiltjo Posthuma
+// Isaac Dunham
+// Jaydeep Patil
+// Jens Gustedt
+// Jeremy Huntwork
+// Jo-Philipp Wich
+// Joakim Sindholt
+// John Spencer
+// Julien Ramseier
+// Justin Cormack
+// Kaarle Ritvanen
+// Khem Raj
+// Kylie McClain
+// Leah Neukirchen
+// Luca Barbato
+// Luka Perkov
+// M Farkas-Dyck (Strake)
+// Mahesh Bodapati
+// Markus Wichmann
+// Masanori Ogino
+// Michael Clark
+// Michael Forney
+// Mikhail Kremnyov
+// Natanael Copa
+// Nicholas J. Kain
+// orc
+// Pascal Cuoq
+// Patrick Oppenlander
+// Petr Hosek
+// Petr Skocik
+// Pierre Carrier
+// Reini Urban
+// Rich Felker
+// Richard Pennington
+// Ryan Fairfax
+// Samuel Holland
+// Segev Finer
+// Shiz
+// sin
+// Solar Designer
+// Stefan Kristiansson
+// Stefan O'Rear
+// Szabolcs Nagy
+// Timo Teräs
+// Trutz Behn
+// Valentin Ochs
+// Will Dietz
+// William Haddon
+// William Pitcock
+//
+// Portions of this software are derived from third-party works licensed
+// under terms compatible with the above MIT license:
+//
+// The TRE regular expression implementation (src/regex/reg* and
+// src/regex/tre*) is Copyright © 2001-2008 Ville Laurikari and licensed
+// under a 2-clause BSD license (license text in the source files). The
+// included version has been heavily modified by Rich Felker in 2012, in
+// the interests of size, simplicity, and namespace cleanliness.
+//
+// Much of the math library code (src/math/* and src/complex/*) is
+// Copyright © 1993,2004 Sun Microsystems or
+// Copyright © 2003-2011 David Schultz or
+// Copyright © 2003-2009 Steven G. Kargl or
+// Copyright © 2003-2009 Bruce D. Evans or
+// Copyright © 2008 Stephen L. Moshier or
+// Copyright © 2017-2018 Arm Limited
+// and labelled as such in comments in the individual source files. All
+// have been licensed under extremely permissive terms.
+//
+// The ARM memcpy code (src/string/arm/memcpy.S) is Copyright © 2008
+// The Android Open Source Project and is licensed under a two-clause BSD
+// license. It was taken from Bionic libc, used on Android.
+//
+// The AArch64 memcpy and memset code (src/string/aarch64/*) are
+// Copyright © 1999-2019, Arm Limited.
+//
+// The implementation of DES for crypt (src/crypt/crypt_des.c) is
+// Copyright © 1994 David Burren. It is licensed under a BSD license.
+//
+// The implementation of blowfish crypt (src/crypt/crypt_blowfish.c) was
+// originally written by Solar Designer and placed into the public
+// domain. The code also comes with a fallback permissive license for use
+// in jurisdictions that may not recognize the public domain.
+//
+// The smoothsort implementation (src/stdlib/qsort.c) is Copyright © 2011
+// Valentin Ochs and is licensed under an MIT-style license.
+//
+// The x86_64 port was written by Nicholas J. Kain and is licensed under
+// the standard MIT terms.
+//
+// The mips and microblaze ports were originally written by Richard
+// Pennington for use in the ellcc project. The original code was adapted
+// by Rich Felker for build system and code conventions during upstream
+// integration. It is licensed under the standard MIT terms.
+//
+// The mips64 port was contributed by Imagination Technologies and is
+// licensed under the standard MIT terms.
+//
+// The powerpc port was also originally written by Richard Pennington,
+// and later supplemented and integrated by John Spencer. It is licensed
+// under the standard MIT terms.
+//
+// All other files which have no copyright comments are original works
+// produced specifically for use as part of this library, written either
+// by Rich Felker, the main author of the library, or by one or more
+// contibutors listed above. Details on authorship of individual files
+// can be found in the git version control history of the project. The
+// omission of copyright and license comments in each file is in the
+// interest of source tree size.
+//
+// In addition, permission is hereby granted for all public header files
+// (include/* and arch/*/bits/*) and crt files intended to be linked into
+// applications (crt/*, ldso/dlstart.c, and arch/*/crt_arch.h) to omit
+// the copyright notice and permission notice otherwise required by the
+// license, and to use these files without any requirement of
+// attribution. These files include substantial contributions from:
+//
+// Bobby Bingham
+// John Spencer
+// Nicholas J. Kain
+// Rich Felker
+// Richard Pennington
+// Stefan Kristiansson
+// Szabolcs Nagy
+//
+// all of whom have explicitly granted such permission.
+//
+// This file previously contained text expressing a belief that most of
+// the files covered by the above exception were sufficiently trivial not
+// to be subject to copyright, resulting in confusion over whether it
+// negated the permissions granted in the license. In the spirit of
+// permissive licensing, and of not having licensing issues being an
+// obstacle to adoption, that text has been removed.
+
+
+use std::fmt;
+
+/// A date/time type which exists primarily to convert `SystemTime` timestamps into an ISO 8601
+/// formatted string.
+///
+/// Yes, this exists. Before you have a heart attack, understand that the meat of this is musl's
+/// [`__secs_to_tm`][1] converted to Rust via [c2rust][2] and then cleaned up by hand as part of
+/// the [kudu-rs project][3], [released under MIT][4].
+///
+/// [1] http://git.musl-libc.org/cgit/musl/tree/src/time/__secs_to_tm.c
+/// [2] https://c2rust.com/
+/// [3] https://github.com/danburkert/kudu-rs/blob/c9660067e5f4c1a54143f169b5eeb49446f82e54/src/timestamp.rs#L5-L18
+/// [4] https://github.com/tokio-rs/tracing/issues/1644#issuecomment-963888244
+///
+/// All existing `strftime`-like APIs I found were unable to handle the full range of timestamps representable
+/// by `SystemTime`, including `strftime` itself, since tm.tm_year is an int.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub(crate) struct DateTime {
+ year: i64,
+ month: u8,
+ day: u8,
+ hour: u8,
+ minute: u8,
+ second: u8,
+ nanos: u32,
+}
+
+impl fmt::Display for DateTime {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ if self.year > 9999 {
+ write!(f, "+{}", self.year)?;
+ } else if self.year < 0 {
+ write!(f, "{:05}", self.year)?;
+ } else {
+ write!(f, "{:04}", self.year)?;
+ }
+
+ write!(
+ f,
+ "-{:02}-{:02}T{:02}:{:02}:{:02}.{:06}Z",
+ self.month,
+ self.day,
+ self.hour,
+ self.minute,
+ self.second,
+ self.nanos / 1_000
+ )
+ }
+}
+
+impl From<std::time::SystemTime> for DateTime {
+ fn from(timestamp: std::time::SystemTime) -> DateTime {
+ let (t, nanos) = match timestamp.duration_since(std::time::UNIX_EPOCH) {
+ Ok(duration) => {
+ debug_assert!(duration.as_secs() <= std::i64::MAX as u64);
+ (duration.as_secs() as i64, duration.subsec_nanos())
+ }
+ Err(error) => {
+ let duration = error.duration();
+ debug_assert!(duration.as_secs() <= std::i64::MAX as u64);
+ let (secs, nanos) = (duration.as_secs() as i64, duration.subsec_nanos());
+ if nanos == 0 {
+ (-secs, 0)
+ } else {
+ (-secs - 1, 1_000_000_000 - nanos)
+ }
+ }
+ };
+
+ // 2000-03-01 (mod 400 year, immediately after feb29
+ const LEAPOCH: i64 = 946_684_800 + 86400 * (31 + 29);
+ const DAYS_PER_400Y: i32 = 365 * 400 + 97;
+ const DAYS_PER_100Y: i32 = 365 * 100 + 24;
+ const DAYS_PER_4Y: i32 = 365 * 4 + 1;
+ static DAYS_IN_MONTH: [i8; 12] = [31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31, 29];
+
+ // Note(dcb): this bit is rearranged slightly to avoid integer overflow.
+ let mut days: i64 = (t / 86_400) - (LEAPOCH / 86_400);
+ let mut remsecs: i32 = (t % 86_400) as i32;
+ if remsecs < 0i32 {
+ remsecs += 86_400;
+ days -= 1
+ }
+
+ let mut qc_cycles: i32 = (days / i64::from(DAYS_PER_400Y)) as i32;
+ let mut remdays: i32 = (days % i64::from(DAYS_PER_400Y)) as i32;
+ if remdays < 0 {
+ remdays += DAYS_PER_400Y;
+ qc_cycles -= 1;
+ }
+
+ let mut c_cycles: i32 = remdays / DAYS_PER_100Y;
+ if c_cycles == 4 {
+ c_cycles -= 1;
+ }
+ remdays -= c_cycles * DAYS_PER_100Y;
+
+ let mut q_cycles: i32 = remdays / DAYS_PER_4Y;
+ if q_cycles == 25 {
+ q_cycles -= 1;
+ }
+ remdays -= q_cycles * DAYS_PER_4Y;
+
+ let mut remyears: i32 = remdays / 365;
+ if remyears == 4 {
+ remyears -= 1;
+ }
+ remdays -= remyears * 365;
+
+ let mut years: i64 = i64::from(remyears)
+ + 4 * i64::from(q_cycles)
+ + 100 * i64::from(c_cycles)
+ + 400 * i64::from(qc_cycles);
+
+ let mut months: i32 = 0;
+ while i32::from(DAYS_IN_MONTH[months as usize]) <= remdays {
+ remdays -= i32::from(DAYS_IN_MONTH[months as usize]);
+ months += 1
+ }
+
+ if months >= 10 {
+ months -= 12;
+ years += 1;
+ }
+
+ DateTime {
+ year: years + 2000,
+ month: (months + 3) as u8,
+ day: (remdays + 1) as u8,
+ hour: (remsecs / 3600) as u8,
+ minute: (remsecs / 60 % 60) as u8,
+ second: (remsecs % 60) as u8,
+ nanos,
+ }
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use std::i32;
+ use std::time::{Duration, UNIX_EPOCH};
+
+ use super::*;
+
+ #[test]
+ fn test_datetime() {
+ let case = |expected: &str, secs: i64, micros: u32| {
+ let timestamp = if secs >= 0 {
+ UNIX_EPOCH + Duration::new(secs as u64, micros * 1_000)
+ } else {
+ (UNIX_EPOCH - Duration::new(!secs as u64 + 1, 0)) + Duration::new(0, micros * 1_000)
+ };
+ assert_eq!(
+ expected,
+ format!("{}", DateTime::from(timestamp)),
+ "secs: {}, micros: {}",
+ secs,
+ micros
+ )
+ };
+
+ // Mostly generated with:
+ // - date -jur <secs> +"%Y-%m-%dT%H:%M:%S.000000Z"
+ // - http://unixtimestamp.50x.eu/
+
+ case("1970-01-01T00:00:00.000000Z", 0, 0);
+
+ case("1970-01-01T00:00:00.000001Z", 0, 1);
+ case("1970-01-01T00:00:00.500000Z", 0, 500_000);
+ case("1970-01-01T00:00:01.000001Z", 1, 1);
+ case("1970-01-01T00:01:01.000001Z", 60 + 1, 1);
+ case("1970-01-01T01:01:01.000001Z", 60 * 60 + 60 + 1, 1);
+ case(
+ "1970-01-02T01:01:01.000001Z",
+ 24 * 60 * 60 + 60 * 60 + 60 + 1,
+ 1,
+ );
+
+ case("1969-12-31T23:59:59.000000Z", -1, 0);
+ case("1969-12-31T23:59:59.000001Z", -1, 1);
+ case("1969-12-31T23:59:59.500000Z", -1, 500_000);
+ case("1969-12-31T23:58:59.000001Z", -60 - 1, 1);
+ case("1969-12-31T22:58:59.000001Z", -60 * 60 - 60 - 1, 1);
+ case(
+ "1969-12-30T22:58:59.000001Z",
+ -24 * 60 * 60 - 60 * 60 - 60 - 1,
+ 1,
+ );
+
+ case("2038-01-19T03:14:07.000000Z", std::i32::MAX as i64, 0);
+ case("2038-01-19T03:14:08.000000Z", std::i32::MAX as i64 + 1, 0);
+ case("1901-12-13T20:45:52.000000Z", i32::MIN as i64, 0);
+ case("1901-12-13T20:45:51.000000Z", i32::MIN as i64 - 1, 0);
+
+ // Skipping these tests on windows as std::time::SysteTime range is low
+ // on Windows compared with that of Unix which can cause the following
+ // high date value tests to panic
+ #[cfg(not(target_os = "windows"))]
+ {
+ case("+292277026596-12-04T15:30:07.000000Z", std::i64::MAX, 0);
+ case("+292277026596-12-04T15:30:06.000000Z", std::i64::MAX - 1, 0);
+ case("-292277022657-01-27T08:29:53.000000Z", i64::MIN + 1, 0);
+ }
+
+ case("1900-01-01T00:00:00.000000Z", -2208988800, 0);
+ case("1899-12-31T23:59:59.000000Z", -2208988801, 0);
+ case("0000-01-01T00:00:00.000000Z", -62167219200, 0);
+ case("-0001-12-31T23:59:59.000000Z", -62167219201, 0);
+
+ case("1234-05-06T07:08:09.000000Z", -23215049511, 0);
+ case("-1234-05-06T07:08:09.000000Z", -101097651111, 0);
+ case("2345-06-07T08:09:01.000000Z", 11847456541, 0);
+ case("-2345-06-07T08:09:01.000000Z", -136154620259, 0);
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/fmt/time/mod.rs b/vendor/tracing-subscriber-0.3.3/src/fmt/time/mod.rs
new file mode 100644
index 000000000..621df16e4
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/fmt/time/mod.rs
@@ -0,0 +1,134 @@
+//! Formatters for event timestamps.
+use crate::fmt::format::Writer;
+use std::fmt;
+use std::time::Instant;
+
+mod datetime;
+
+#[cfg(feature = "time")]
+mod time_crate;
+#[cfg(feature = "time")]
+#[cfg_attr(docsrs, doc(cfg(feature = "time")))]
+pub use time_crate::UtcTime;
+
+#[cfg(feature = "local-time")]
+#[cfg_attr(docsrs, doc(cfg(feature = "local-time")))]
+pub use time_crate::LocalTime;
+
+/// A type that can measure and format the current time.
+///
+/// This trait is used by `Format` to include a timestamp with each `Event` when it is logged.
+///
+/// Notable default implementations of this trait are `SystemTime` and `()`. The former prints the
+/// current time as reported by `std::time::SystemTime`, and the latter does not print the current
+/// time at all. `FormatTime` is also automatically implemented for any function pointer with the
+/// appropriate signature.
+///
+/// The full list of provided implementations can be found in [`time`].
+///
+/// [`time`]: ./index.html
+pub trait FormatTime {
+ /// Measure and write out the current time.
+ ///
+ /// When `format_time` is called, implementors should get the current time using their desired
+ /// mechanism, and write it out to the given `fmt::Write`. Implementors must insert a trailing
+ /// space themselves if they wish to separate the time from subsequent log message text.
+ fn format_time(&self, w: &mut Writer<'_>) -> fmt::Result;
+}
+
+/// Returns a new `SystemTime` timestamp provider.
+///
+/// This can then be configured further to determine how timestamps should be
+/// configured.
+///
+/// This is equivalent to calling
+/// ```rust
+/// # fn timer() -> tracing_subscriber::fmt::time::SystemTime {
+/// tracing_subscriber::fmt::time::SystemTime::default()
+/// # }
+/// ```
+pub fn time() -> SystemTime {
+ SystemTime::default()
+}
+
+/// Returns a new `Uptime` timestamp provider.
+///
+/// With this timer, timestamps will be formatted with the amount of time
+/// elapsed since the timestamp provider was constructed.
+///
+/// This can then be configured further to determine how timestamps should be
+/// configured.
+///
+/// This is equivalent to calling
+/// ```rust
+/// # fn timer() -> tracing_subscriber::fmt::time::Uptime {
+/// tracing_subscriber::fmt::time::Uptime::default()
+/// # }
+/// ```
+pub fn uptime() -> Uptime {
+ Uptime::default()
+}
+
+impl<'a, F> FormatTime for &'a F
+where
+ F: FormatTime,
+{
+ fn format_time(&self, w: &mut Writer<'_>) -> fmt::Result {
+ (*self).format_time(w)
+ }
+}
+
+impl FormatTime for () {
+ fn format_time(&self, _: &mut Writer<'_>) -> fmt::Result {
+ Ok(())
+ }
+}
+
+impl FormatTime for fn(&mut Writer<'_>) -> fmt::Result {
+ fn format_time(&self, w: &mut Writer<'_>) -> fmt::Result {
+ (*self)(w)
+ }
+}
+
+/// Retrieve and print the current wall-clock time.
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Default)]
+pub struct SystemTime;
+
+/// Retrieve and print the relative elapsed wall-clock time since an epoch.
+///
+/// The `Default` implementation for `Uptime` makes the epoch the current time.
+#[derive(Debug, Clone, Copy, Eq, PartialEq)]
+pub struct Uptime {
+ epoch: Instant,
+}
+
+impl Default for Uptime {
+ fn default() -> Self {
+ Uptime {
+ epoch: Instant::now(),
+ }
+ }
+}
+
+impl From<Instant> for Uptime {
+ fn from(epoch: Instant) -> Self {
+ Uptime { epoch }
+ }
+}
+
+impl FormatTime for SystemTime {
+ fn format_time(&self, w: &mut Writer<'_>) -> fmt::Result {
+ write!(
+ w,
+ "{}",
+ datetime::DateTime::from(std::time::SystemTime::now())
+ )
+ }
+}
+
+impl FormatTime for Uptime {
+ fn format_time(&self, w: &mut Writer<'_>) -> fmt::Result {
+ let e = self.epoch.elapsed();
+ write!(w, "{:4}.{:09}s", e.as_secs(), e.subsec_nanos())
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/fmt/time/time_crate.rs b/vendor/tracing-subscriber-0.3.3/src/fmt/time/time_crate.rs
new file mode 100644
index 000000000..64d274365
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/fmt/time/time_crate.rs
@@ -0,0 +1,276 @@
+use crate::fmt::{format::Writer, time::FormatTime, writer::WriteAdaptor};
+use std::fmt;
+use time::{format_description::well_known, formatting::Formattable, OffsetDateTime};
+
+/// Formats the current [local time] using a [formatter] from the [`time` crate].
+///
+/// To format the current [UTC time] instead, use the [`UtcTime`] type.
+///
+/// [local time]: https://docs.rs/time/0.3/time/struct.OffsetDateTime.html#method.now_local
+/// [UTC time]: https://docs.rs/time/0.3/time/struct.OffsetDateTime.html#method.now_utc
+/// [formatter]: https://docs.rs/time/0.3/time/formatting/trait.Formattable.html
+/// [`time` crate]: https://docs.rs/time/0.3/time/
+#[derive(Clone, Debug)]
+#[cfg_attr(docsrs, doc(cfg(all(feature = "time", feature = "local-time"))))]
+#[cfg(feature = "local-time")]
+pub struct LocalTime<F> {
+ format: F,
+}
+
+/// Formats the current [UTC time] using a [formatter] from the [`time` crate].
+///
+/// To format the current [local time] instead, use the [`LocalTime`] type.
+///
+/// [local time]: https://docs.rs/time/0.3/time/struct.OffsetDateTime.html#method.now_local
+/// [UTC time]: https://docs.rs/time/0.3/time/struct.OffsetDateTime.html#method.now_utc
+/// [formatter]: https://docs.rs/time/0.3/time/formatting/trait.Formattable.html
+/// [`time` crate]: https://docs.rs/time/0.3/time/
+#[cfg_attr(docsrs, doc(cfg(feature = "time")))]
+#[derive(Clone, Debug)]
+pub struct UtcTime<F> {
+ format: F,
+}
+
+// === impl LocalTime ===
+
+#[cfg(feature = "local-time")]
+impl LocalTime<well_known::Rfc3339> {
+ /// Returns a formatter that formats the current [local time] in the
+ /// [RFC 3339] format (a subset of the [ISO 8601] timestamp format).
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing_subscriber::fmt::{self, time};
+ ///
+ /// let collector = tracing_subscriber::fmt()
+ /// .with_timer(time::LocalTime::rfc_3339());
+ /// # drop(collector);
+ /// ```
+ ///
+ /// [local time]: https://docs.rs/time/0.3/time/struct.OffsetDateTime.html#method.now_local
+ /// [RFC 3339]: https://datatracker.ietf.org/doc/html/rfc3339
+ /// [ISO 8601]: https://en.wikipedia.org/wiki/ISO_8601
+ pub fn rfc_3339() -> Self {
+ Self::new(well_known::Rfc3339)
+ }
+}
+
+#[cfg(feature = "local-time")]
+impl<F: Formattable> LocalTime<F> {
+ /// Returns a formatter that formats the current [local time] using the
+ /// [`time` crate] with the provided provided format. The format may be any
+ /// type that implements the [`Formattable`] trait.
+ ///
+ /// Typically, the format will be a format description string, or one of the
+ /// `time` crate's [well-known formats].
+ ///
+ /// If the format description is statically known, then the
+ /// [`format_description!`] macro should be used. This is identical to the
+ /// [`time::format_description::parse`] method, but runs at compile-time,
+ /// throwing an error if the format description is invalid. If the desired format
+ /// is not known statically (e.g., a user is providing a format string), then the
+ /// [`time::format_description::parse`] method should be used. Note that this
+ /// method is fallible.
+ ///
+ /// See the [`time` book] for details on the format description syntax.
+ ///
+ /// # Examples
+ ///
+ /// Using the [`format_description!`] macro:
+ ///
+ /// ```
+ /// use tracing_subscriber::fmt::{self, time::LocalTime};
+ /// use time::macros::format_description;
+ ///
+ /// let timer = LocalTime::new(format_description!("[hour]:[minute]:[second]"));
+ /// let collector = tracing_subscriber::fmt()
+ /// .with_timer(timer);
+ /// # drop(collector);
+ /// ```
+ ///
+ /// Using [`time::format_description::parse`]:
+ ///
+ /// ```
+ /// use tracing_subscriber::fmt::{self, time::LocalTime};
+ ///
+ /// let time_format = time::format_description::parse("[hour]:[minute]:[second]")
+ /// .expect("format string should be valid!");
+ /// let timer = LocalTime::new(time_format);
+ /// let collector = tracing_subscriber::fmt()
+ /// .with_timer(timer);
+ /// # drop(collector);
+ /// ```
+ ///
+ /// Using the [`format_description!`] macro requires enabling the `time`
+ /// crate's "macros" feature flag.
+ ///
+ /// Using a [well-known format][well-known formats] (this is equivalent to
+ /// [`LocalTime::rfc_3339`]):
+ ///
+ /// ```
+ /// use tracing_subscriber::fmt::{self, time::LocalTime};
+ ///
+ /// let timer = LocalTime::new(time::format_description::well_known::Rfc3339);
+ /// let collector = tracing_subscriber::fmt()
+ /// .with_timer(timer);
+ /// # drop(collector);
+ /// ```
+ ///
+ /// [local time]: https://docs.rs/time/latest/time/struct.OffsetDateTime.html#method.now_local
+ /// [`time` crate]: https://docs.rs/time/0.3/time/
+ /// [`Formattable`]: https://docs.rs/time/0.3/time/formatting/trait.Formattable.html
+ /// [well-known formats]: https://docs.rs/time/0.3/time/format_description/well_known/index.html
+ /// [`format_description!`]: https://docs.rs/time/0.3/time/macros/macro.format_description.html
+ /// [`time::format_description::parse`]: https://docs.rs/time/0.3/time/format_description/fn.parse.html
+ /// [`time` book]: https://time-rs.github.io/book/api/format-description.html
+ pub fn new(format: F) -> Self {
+ Self { format }
+ }
+}
+
+#[cfg(feature = "local-time")]
+impl<F> FormatTime for LocalTime<F>
+where
+ F: Formattable,
+{
+ fn format_time(&self, w: &mut Writer<'_>) -> fmt::Result {
+ let now = OffsetDateTime::now_local().map_err(|_| fmt::Error)?;
+ format_datetime(now, w, &self.format)
+ }
+}
+
+#[cfg(feature = "local-time")]
+impl<F> Default for LocalTime<F>
+where
+ F: Formattable + Default,
+{
+ fn default() -> Self {
+ Self::new(F::default())
+ }
+}
+
+// === impl UtcTime ===
+
+impl UtcTime<well_known::Rfc3339> {
+ /// Returns a formatter that formats the current [UTC time] in the
+ /// [RFC 3339] format, which is a subset of the [ISO 8601] timestamp format.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing_subscriber::fmt::{self, time};
+ ///
+ /// let collector = tracing_subscriber::fmt()
+ /// .with_timer(time::UtcTime::rfc_3339());
+ /// # drop(collector);
+ /// ```
+ ///
+ /// [local time]: https://docs.rs/time/0.3/time/struct.OffsetDateTime.html#method.now_utc
+ /// [RFC 3339]: https://datatracker.ietf.org/doc/html/rfc3339
+ /// [ISO 8601]: https://en.wikipedia.org/wiki/ISO_8601
+ pub fn rfc_3339() -> Self {
+ Self::new(well_known::Rfc3339)
+ }
+}
+
+impl<F: Formattable> UtcTime<F> {
+ /// Returns a formatter that formats the current [UTC time] using the
+ /// [`time` crate], with the provided provided format. The format may be any
+ /// type that implements the [`Formattable`] trait.
+ ///
+ /// Typically, the format will be a format description string, or one of the
+ /// `time` crate's [well-known formats].
+ ///
+ /// If the format description is statically known, then the
+ /// [`format_description!`] macro should be used. This is identical to the
+ /// [`time::format_description::parse`] method, but runs at compile-time,
+ /// failing an error if the format description is invalid. If the desired format
+ /// is not known statically (e.g., a user is providing a format string), then the
+ /// [`time::format_description::parse`] method should be used. Note that this
+ /// method is fallible.
+ ///
+ /// See the [`time` book] for details on the format description syntax.
+ ///
+ /// # Examples
+ ///
+ /// Using the [`format_description!`] macro:
+ ///
+ /// ```
+ /// use tracing_subscriber::fmt::{self, time::UtcTime};
+ /// use time::macros::format_description;
+ ///
+ /// let timer = UtcTime::new(format_description!("[hour]:[minute]:[second]"));
+ /// let collector = tracing_subscriber::fmt()
+ /// .with_timer(timer);
+ /// # drop(collector);
+ /// ```
+ ///
+ /// Using the [`format_description!`] macro requires enabling the `time`
+ /// crate's "macros" feature flag.
+ ///
+ /// Using [`time::format_description::parse`]:
+ ///
+ /// ```
+ /// use tracing_subscriber::fmt::{self, time::UtcTime};
+ ///
+ /// let time_format = time::format_description::parse("[hour]:[minute]:[second]")
+ /// .expect("format string should be valid!");
+ /// let timer = UtcTime::new(time_format);
+ /// let collector = tracing_subscriber::fmt()
+ /// .with_timer(timer);
+ /// # drop(collector);
+ /// ```
+ ///
+ /// Using a [well-known format][well-known formats] (this is equivalent to
+ /// [`UtcTime::rfc_3339`]):
+ ///
+ /// ```
+ /// use tracing_subscriber::fmt::{self, time::UtcTime};
+ ///
+ /// let timer = UtcTime::new(time::format_description::well_known::Rfc3339);
+ /// let collector = tracing_subscriber::fmt()
+ /// .with_timer(timer);
+ /// # drop(collector);
+ /// ```
+ ///
+ /// [UTC time]: https://docs.rs/time/latest/time/struct.OffsetDateTime.html#method.now_utc
+ /// [`time` crate]: https://docs.rs/time/0.3/time/
+ /// [`Formattable`]: https://docs.rs/time/0.3/time/formatting/trait.Formattable.html
+ /// [well-known formats]: https://docs.rs/time/0.3/time/format_description/well_known/index.html
+ /// [`format_description!`]: https://docs.rs/time/0.3/time/macros/macro.format_description.html
+ /// [`time::format_description::parse`]: https://docs.rs/time/0.3/time/format_description/fn.parse.html
+ /// [`time` book]: https://time-rs.github.io/book/api/format-description.html
+ pub fn new(format: F) -> Self {
+ Self { format }
+ }
+}
+
+impl<F> FormatTime for UtcTime<F>
+where
+ F: Formattable,
+{
+ fn format_time(&self, w: &mut Writer<'_>) -> fmt::Result {
+ format_datetime(OffsetDateTime::now_utc(), w, &self.format)
+ }
+}
+
+impl<F> Default for UtcTime<F>
+where
+ F: Formattable + Default,
+{
+ fn default() -> Self {
+ Self::new(F::default())
+ }
+}
+
+fn format_datetime(
+ now: OffsetDateTime,
+ into: &mut Writer<'_>,
+ fmt: &impl Formattable,
+) -> fmt::Result {
+ let mut into = WriteAdaptor::new(into);
+ now.format_into(&mut into, fmt)
+ .map_err(|_| fmt::Error)
+ .map(|_| ())
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/fmt/writer.rs b/vendor/tracing-subscriber-0.3.3/src/fmt/writer.rs
new file mode 100644
index 000000000..0974891f7
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/fmt/writer.rs
@@ -0,0 +1,1464 @@
+//! Abstractions for creating [`io::Write`] instances.
+//!
+//! [`io::Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
+use std::{
+ fmt,
+ io::{self, Write},
+ sync::{Arc, Mutex, MutexGuard},
+};
+use tracing_core::Metadata;
+
+/// A type that can create [`io::Write`] instances.
+///
+/// `MakeWriter` is used by [`fmt::Layer`] or [`fmt::Subscriber`] to print
+/// formatted text representations of [`Event`]s.
+///
+/// This trait is already implemented for function pointers and
+/// immutably-borrowing closures that return an instance of [`io::Write`], such
+/// as [`io::stdout`] and [`io::stderr`]. Additionally, it is implemented for
+/// [`std::sync::Mutex`][mutex] when the tyoe inside the mutex implements
+/// [`io::Write`].
+///
+/// # Examples
+///
+/// The simplest usage is to pass in a named function that returns a writer. For
+/// example, to log all events to stderr, we could write:
+/// ```
+/// let subscriber = tracing_subscriber::fmt()
+/// .with_writer(std::io::stderr)
+/// .finish();
+/// # drop(subscriber);
+/// ```
+///
+/// Any function that returns a writer can be used:
+///
+/// ```
+/// fn make_my_great_writer() -> impl std::io::Write {
+/// // ...
+/// # std::io::stdout()
+/// }
+///
+/// let subscriber = tracing_subscriber::fmt()
+/// .with_writer(make_my_great_writer)
+/// .finish();
+/// # drop(subscriber);
+/// ```
+///
+/// A closure can be used to introduce arbitrary logic into how the writer is
+/// created. Consider the (admittedly rather silly) example of sending every 5th
+/// event to stderr, and all other events to stdout:
+///
+/// ```
+/// use std::io;
+/// use std::sync::atomic::{AtomicUsize, Ordering::Relaxed};
+///
+/// let n = AtomicUsize::new(0);
+/// let subscriber = tracing_subscriber::fmt()
+/// .with_writer(move || -> Box<dyn io::Write> {
+/// if n.fetch_add(1, Relaxed) % 5 == 0 {
+/// Box::new(io::stderr())
+/// } else {
+/// Box::new(io::stdout())
+/// }
+/// })
+/// .finish();
+/// # drop(subscriber);
+/// ```
+///
+/// A single instance of a type implementing [`io::Write`] may be used as a
+/// `MakeWriter` by wrapping it in a [`Mutex`][mutex]. For example, we could
+/// write to a file like so:
+///
+/// ```
+/// use std::{fs::File, sync::Mutex};
+///
+/// # fn docs() -> Result<(), Box<dyn std::error::Error>> {
+/// let log_file = File::create("my_cool_trace.log")?;
+/// let subscriber = tracing_subscriber::fmt()
+/// .with_writer(Mutex::new(log_file))
+/// .finish();
+/// # drop(subscriber);
+/// # Ok(())
+/// # }
+/// ```
+///
+/// [`io::Write`]: std::io::Write
+/// [`fmt::Layer`]: crate::fmt::Layer
+/// [`fmt::Subscriber`]: crate::fmt::Subscriber
+/// [`Event`]: tracing_core::event::Event
+/// [`io::stdout`]: std::io::stdout()
+/// [`io::stderr`]: std::io::stderr()
+/// [mutex]: std::sync::Mutex
+/// [`MakeWriter::make_writer_for`]: MakeWriter::make_writer_for
+/// [`Metadata`]: tracing_core::Metadata
+/// [levels]: tracing_core::Level
+/// [targets]: tracing_core::Metadata::target
+pub trait MakeWriter<'a> {
+ /// The concrete [`io::Write`] implementation returned by [`make_writer`].
+ ///
+ /// [`io::Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
+ /// [`make_writer`]: #tymethod.make_writer
+ type Writer: io::Write;
+
+ /// Returns an instance of [`Writer`].
+ ///
+ /// # Implementer notes
+ ///
+ /// [`fmt::Layer`] or [`fmt::Subscriber`] will call this method each time an event is recorded. Ensure any state
+ /// that must be saved across writes is not lost when the [`Writer`] instance is dropped. If
+ /// creating a [`io::Write`] instance is expensive, be sure to cache it when implementing
+ /// [`MakeWriter`] to improve performance.
+ ///
+ /// [`Writer`]: #associatedtype.Writer
+ /// [`fmt::Layer`]: crate::fmt::Layer
+ /// [`fmt::Subscriber`]: crate::fmt::Subscriber
+ /// [`io::Write`]: std::io::Write
+ fn make_writer(&'a self) -> Self::Writer;
+
+ /// Returns a [`Writer`] for writing data from the span or event described
+ /// by the provided [`Metadata`].
+ ///
+ /// By default, this calls [`self.make_writer()`][make_writer], ignoring
+ /// the provided metadata, but implementations can override this to provide
+ /// metadata-specific behaviors.
+ ///
+ /// This method allows `MakeWriter` implementations to implement different
+ /// behaviors based on the span or event being written. The `MakeWriter`
+ /// type might return different writers based on the provided metadata, or
+ /// might write some values to the writer before or after providing it to
+ /// the caller.
+ ///
+ /// For example, we might want to write data from spans and events at the
+ /// [`ERROR`] and [`WARN`] levels to `stderr`, and data from spans or events
+ /// at lower levels to stdout:
+ ///
+ /// ```
+ /// use std::io::{self, Stdout, Stderr, StdoutLock, StderrLock};
+ /// use tracing_subscriber::fmt::writer::MakeWriter;
+ /// use tracing_core::{Metadata, Level};
+ ///
+ /// pub struct MyMakeWriter {
+ /// stdout: Stdout,
+ /// stderr: Stderr,
+ /// }
+ ///
+ /// /// A lock on either stdout or stderr, depending on the verbosity level
+ /// /// of the event being written.
+ /// pub enum StdioLock<'a> {
+ /// Stdout(StdoutLock<'a>),
+ /// Stderr(StderrLock<'a>),
+ /// }
+ ///
+ /// impl<'a> io::Write for StdioLock<'a> {
+ /// fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ /// match self {
+ /// StdioLock::Stdout(lock) => lock.write(buf),
+ /// StdioLock::Stderr(lock) => lock.write(buf),
+ /// }
+ /// }
+ ///
+ /// fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
+ /// // ...
+ /// # match self {
+ /// # StdioLock::Stdout(lock) => lock.write_all(buf),
+ /// # StdioLock::Stderr(lock) => lock.write_all(buf),
+ /// # }
+ /// }
+ ///
+ /// fn flush(&mut self) -> io::Result<()> {
+ /// // ...
+ /// # match self {
+ /// # StdioLock::Stdout(lock) => lock.flush(),
+ /// # StdioLock::Stderr(lock) => lock.flush(),
+ /// # }
+ /// }
+ /// }
+ ///
+ /// impl<'a> MakeWriter<'a> for MyMakeWriter {
+ /// type Writer = StdioLock<'a>;
+ ///
+ /// fn make_writer(&'a self) -> Self::Writer {
+ /// // We must have an implementation of `make_writer` that makes
+ /// // a "default" writer without any configuring metadata. Let's
+ /// // just return stdout in that case.
+ /// StdioLock::Stdout(self.stdout.lock())
+ /// }
+ ///
+ /// fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer {
+ /// // Here's where we can implement our special behavior. We'll
+ /// // check if the metadata's verbosity level is WARN or ERROR,
+ /// // and return stderr in that case.
+ /// if meta.level() <= &Level::WARN {
+ /// return StdioLock::Stderr(self.stderr.lock());
+ /// }
+ ///
+ /// // Otherwise, we'll return stdout.
+ /// StdioLock::Stdout(self.stdout.lock())
+ /// }
+ /// }
+ /// ```
+ ///
+ /// [`Writer`]: MakeWriter::Writer
+ /// [`Metadata`]: tracing_core::Metadata
+ /// [make_writer]: MakeWriter::make_writer
+ /// [`WARN`]: tracing_core::Level::WARN
+ /// [`ERROR`]: tracing_core::Level::ERROR
+ fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer {
+ let _ = meta;
+ self.make_writer()
+ }
+}
+
+/// Extension trait adding combinators for working with types implementing
+/// [`MakeWriter`].
+///
+/// This is not intended to be implemented directly for user-defined
+/// [`MakeWriter`]s; instead, it should be imported when the desired methods are
+/// used.
+pub trait MakeWriterExt<'a>: MakeWriter<'a> {
+ /// Wraps `self` and returns a [`MakeWriter`] that will only write output
+ /// for events at or below the provided verbosity [`Level`]. For instance,
+ /// `Level::TRACE` is considered to be _more verbose` than `Level::INFO`.
+ ///
+ /// Events whose level is more verbose than `level` will be ignored, and no
+ /// output will be written.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing::Level;
+ /// use tracing_subscriber::fmt::writer::MakeWriterExt;
+ ///
+ /// // Construct a writer that outputs events to `stderr` only if the span or
+ /// // event's level is >= WARN (WARN and ERROR).
+ /// let mk_writer = std::io::stderr.with_max_level(Level::WARN);
+ ///
+ /// tracing_subscriber::fmt().with_writer(mk_writer).init();
+ /// ```
+ ///
+ /// Writing the `ERROR` and `WARN` levels to `stderr`, and everything else
+ /// to `stdout`:
+ ///
+ /// ```
+ /// # use tracing::Level;
+ /// # use tracing_subscriber::fmt::writer::MakeWriterExt;
+ ///
+ /// let mk_writer = std::io::stderr
+ /// .with_max_level(Level::WARN)
+ /// .or_else(std::io::stdout);
+ ///
+ /// tracing_subscriber::fmt().with_writer(mk_writer).init();
+ /// ```
+ ///
+ /// Writing the `ERROR` level to `stderr`, the `INFO` and `WARN` levels to
+ /// `stdout`, and the `INFO` and DEBUG` levels to a file:
+ ///
+ /// ```
+ /// # use tracing::Level;
+ /// # use tracing_subscriber::fmt::writer::MakeWriterExt;
+ /// use std::{sync::Arc, fs::File};
+ /// # // don't actually create the file when running the tests.
+ /// # fn docs() -> std::io::Result<()> {
+ /// let debug_log = Arc::new(File::create("debug.log")?);
+ ///
+ /// let mk_writer = std::io::stderr
+ /// .with_max_level(Level::ERROR)
+ /// .or_else(std::io::stdout
+ /// .with_max_level(Level::INFO)
+ /// .and(debug_log.with_max_level(Level::DEBUG))
+ /// );
+ ///
+ /// tracing_subscriber::fmt().with_writer(mk_writer).init();
+ /// # Ok(()) }
+ /// ```
+ ///
+ /// [`Level`]: tracing_core::Level
+ /// [`io::Write`]: std::io::Write
+ fn with_max_level(self, level: tracing_core::Level) -> WithMaxLevel<Self>
+ where
+ Self: Sized,
+ {
+ WithMaxLevel::new(self, level)
+ }
+
+ /// Wraps `self` and returns a [`MakeWriter`] that will only write output
+ /// for events at or above the provided verbosity [`Level`].
+ ///
+ /// Events whose level is less verbose than `level` will be ignored, and no
+ /// output will be written.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing::Level;
+ /// use tracing_subscriber::fmt::writer::MakeWriterExt;
+ ///
+ /// // Construct a writer that outputs events to `stdout` only if the span or
+ /// // event's level is <= DEBUG (DEBUG and TRACE).
+ /// let mk_writer = std::io::stdout.with_min_level(Level::DEBUG);
+ ///
+ /// tracing_subscriber::fmt().with_writer(mk_writer).init();
+ /// ```
+ /// This can be combined with [`MakeWriterExt::with_max_level`] to write
+ /// only within a range of levels:
+ ///
+ /// ```
+ /// # use tracing::Level;
+ /// # use tracing_subscriber::fmt::writer::MakeWriterExt;
+ /// // Only write the `DEBUG` and `INFO` levels to stdout.
+ /// let mk_writer = std::io::stdout
+ /// .with_max_level(Level::DEBUG)
+ /// .with_min_level(Level::INFO)
+ /// // Write the `WARN` and `ERROR` levels to stderr.
+ /// .and(std::io::stderr.with_min_level(Level::WARN));
+ ///
+ /// tracing_subscriber::fmt().with_writer(mk_writer).init();
+ /// ```
+ /// [`Level`]: tracing_core::Level
+ /// [`io::Write`]: std::io::Write
+ fn with_min_level(self, level: tracing_core::Level) -> WithMinLevel<Self>
+ where
+ Self: Sized,
+ {
+ WithMinLevel::new(self, level)
+ }
+
+ /// Wraps `self` with a predicate that takes a span or event's [`Metadata`]
+ /// and returns a `bool`. The returned [`MakeWriter`]'s
+ /// [`MakeWriter::make_writer_for`][mwf] method will check the predicate to
+ /// determine if a writer should be produced for a given span or event.
+ ///
+ /// If the predicate returns `false`, the wrapped [`MakeWriter`]'s
+ /// [`make_writer_for`][mwf] will return [`OptionalWriter::none`][own].
+ /// Otherwise, it calls the wrapped [`MakeWriter`]'s
+ /// [`make_writer_for`][mwf] method, and returns the produced writer.
+ ///
+ /// This can be used to filter an output based on arbitrary [`Metadata`]
+ /// parameters.
+ ///
+ /// # Examples
+ ///
+ /// Writing events with a specific target to an HTTP access log, and other
+ /// events to stdout:
+ ///
+ /// ```
+ /// use tracing_subscriber::fmt::writer::MakeWriterExt;
+ /// use std::{sync::Arc, fs::File};
+ /// # // don't actually create the file when running the tests.
+ /// # fn docs() -> std::io::Result<()> {
+ /// let access_log = Arc::new(File::create("access.log")?);
+ ///
+ /// let mk_writer = access_log
+ /// // Only write events with the target "http::access_log" to the
+ /// // access log file.
+ /// .with_filter(|meta| meta.target() == "http::access_log")
+ /// // Write events with all other targets to stdout.
+ /// .or_else(std::io::stdout);
+ ///
+ /// tracing_subscriber::fmt().with_writer(mk_writer).init();
+ /// # Ok(())
+ /// # }
+ /// ```
+ ///
+ /// Conditionally enabling or disabling a log file:
+ /// ```
+ /// use tracing_subscriber::fmt::writer::MakeWriterExt;
+ /// use std::{
+ /// sync::{Arc, atomic::{AtomicBool, Ordering}},
+ /// fs::File,
+ /// };
+ ///
+ /// static DEBUG_LOG_ENABLED: AtomicBool = AtomicBool::new(false);
+ ///
+ /// # // don't actually create the file when running the tests.
+ /// # fn docs() -> std::io::Result<()> {
+ /// // Create the debug log file
+ /// let debug_file = Arc::new(File::create("debug.log")?)
+ /// // Enable the debug log only if the flag is enabled.
+ /// .with_filter(|_| DEBUG_LOG_ENABLED.load(Ordering::Acquire));
+ ///
+ /// // Always write to stdout
+ /// let mk_writer = std::io::stdout
+ /// // Write to the debug file if it's enabled
+ /// .and(debug_file);
+ ///
+ /// tracing_subscriber::fmt().with_writer(mk_writer).init();
+ ///
+ /// // ...
+ ///
+ /// // Later, we can toggle on or off the debug log file.
+ /// DEBUG_LOG_ENABLED.store(true, Ordering::Release);
+ /// # Ok(())
+ /// # }
+ /// ```
+ ///
+ /// [`Metadata`]: tracing_core::Metadata
+ /// [mwf]: MakeWriter::make_writer_for
+ /// [own]: EitherWriter::none
+ fn with_filter<F>(self, filter: F) -> WithFilter<Self, F>
+ where
+ Self: Sized,
+ F: Fn(&Metadata<'_>) -> bool,
+ {
+ WithFilter::new(self, filter)
+ }
+
+ /// Combines `self` with another type implementing [`MakeWriter`], returning
+ /// a new [`MakeWriter`] that produces [writers] that write to *both*
+ /// outputs.
+ ///
+ /// If writing to either writer returns an error, the returned writer will
+ /// return that error. However, both writers will still be written to before
+ /// the error is returned, so it is possible for one writer to fail while
+ /// the other is written to successfully.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing_subscriber::fmt::writer::MakeWriterExt;
+ ///
+ /// // Construct a writer that outputs events to `stdout` *and* `stderr`.
+ /// let mk_writer = std::io::stdout.and(std::io::stderr);
+ ///
+ /// tracing_subscriber::fmt().with_writer(mk_writer).init();
+ /// ```
+ ///
+ /// `and` can be used in conjunction with filtering combinators. For
+ /// example, if we want to write to a number of outputs depending on the
+ /// level of an event, we could write:
+ ///
+ /// ```
+ /// use tracing::Level;
+ /// # use tracing_subscriber::fmt::writer::MakeWriterExt;
+ /// use std::{sync::Arc, fs::File};
+ /// # // don't actually create the file when running the tests.
+ /// # fn docs() -> std::io::Result<()> {
+ /// let debug_log = Arc::new(File::create("debug.log")?);
+ ///
+ /// // Write everything to the debug log.
+ /// let mk_writer = debug_log
+ /// // Write the `ERROR` and `WARN` levels to stderr.
+ /// .and(std::io::stderr.with_max_level(Level::WARN))
+ /// // Write `INFO` to `stdout`.
+ /// .and(std::io::stdout
+ /// .with_max_level(Level::INFO)
+ /// .with_min_level(Level::INFO)
+ /// );
+ ///
+ /// tracing_subscriber::fmt().with_writer(mk_writer).init();
+ /// # Ok(()) }
+ /// ```
+ ///
+ /// [writers]: std::io::Write
+ fn and<B>(self, other: B) -> Tee<Self, B>
+ where
+ Self: Sized,
+ B: MakeWriter<'a> + Sized,
+ {
+ Tee::new(self, other)
+ }
+
+ /// Combines `self` with another type implementing [`MakeWriter`], returning
+ /// a new [`MakeWriter`] that calls `other`'s [`make_writer`] if `self`'s
+ /// `make_writer` returns [`OptionalWriter::none`][own].
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use tracing::Level;
+ /// use tracing_subscriber::fmt::writer::MakeWriterExt;
+ ///
+ /// // Produces a writer that writes to `stderr` if the level is >= WARN,
+ /// // or returns `OptionalWriter::none()` otherwise.
+ /// let stderr = std::io::stderr.with_max_level(Level::WARN);
+ ///
+ /// // If the `stderr` `MakeWriter` is disabled by the max level filter,
+ /// // write to stdout instead:
+ /// let mk_writer = stderr.or_else(std::io::stdout);
+ ///
+ /// tracing_subscriber::fmt().with_writer(mk_writer).init();
+ /// ```
+ ///
+ /// [`make_writer`]: MakeWriter::make_writer
+ /// [own]: EitherWriter::none
+ fn or_else<W, B>(self, other: B) -> OrElse<Self, B>
+ where
+ Self: MakeWriter<'a, Writer = OptionalWriter<W>> + Sized,
+ B: MakeWriter<'a> + Sized,
+ W: Write,
+ {
+ OrElse::new(self, other)
+ }
+}
+
+/// A writer intended to support [`libtest`'s output capturing][capturing] for use in unit tests.
+///
+/// `TestWriter` is used by [`fmt::Subscriber`] or [`fmt::Layer`] to enable capturing support.
+///
+/// `cargo test` can only capture output from the standard library's [`print!`] macro. See
+/// [`libtest`'s output capturing][capturing] for more details about output capturing.
+///
+/// Writing to [`io::stdout`] and [`io::stderr`] produces the same results as using
+/// [`libtest`'s `--nocapture` option][nocapture] which may make the results look unreadable.
+///
+/// [`fmt::Subscriber`]: ../struct.Subscriber.html
+/// [`fmt::Layer`]: ../struct.Layer.html
+/// [capturing]: https://doc.rust-lang.org/book/ch11-02-running-tests.html#showing-function-output
+/// [nocapture]: https://doc.rust-lang.org/cargo/commands/cargo-test.html
+/// [`io::stdout`]: https://doc.rust-lang.org/std/io/fn.stdout.html
+/// [`io::stderr`]: https://doc.rust-lang.org/std/io/fn.stderr.html
+/// [`print!`]: https://doc.rust-lang.org/std/macro.print.html
+#[derive(Default, Debug)]
+pub struct TestWriter {
+ _p: (),
+}
+
+/// A writer that erases the specific [`io::Write`] and [`MakeWriter`] types being used.
+///
+/// This is useful in cases where the concrete type of the writer cannot be known
+/// until runtime.
+///
+/// # Examples
+///
+/// A function that returns a [`Subscriber`] that will write to either stdout or stderr:
+///
+/// ```rust
+/// # use tracing::Subscriber;
+/// # use tracing_subscriber::fmt::writer::BoxMakeWriter;
+///
+/// fn dynamic_writer(use_stderr: bool) -> impl Subscriber {
+/// let writer = if use_stderr {
+/// BoxMakeWriter::new(std::io::stderr)
+/// } else {
+/// BoxMakeWriter::new(std::io::stdout)
+/// };
+///
+/// tracing_subscriber::fmt().with_writer(writer).finish()
+/// }
+/// ```
+///
+/// [`Subscriber`]: tracing::Subscriber
+/// [`io::Write`]: std::io::Write
+pub struct BoxMakeWriter {
+ inner: Box<dyn for<'a> MakeWriter<'a, Writer = Box<dyn Write + 'a>> + Send + Sync>,
+ name: &'static str,
+}
+
+/// A [writer] that is one of two types implementing [`io::Write`][writer].
+///
+/// This may be used by [`MakeWriter`] implementations that may conditionally
+/// return one of two writers.
+///
+/// [writer]: std::io::Write
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub enum EitherWriter<A, B> {
+ /// A writer of type `A`.
+ A(A),
+ /// A writer of type `B`.
+ B(B),
+}
+
+/// A [writer] which may or may not be enabled.
+///
+/// This may be used by [`MakeWriter`] implementations that wish to
+/// conditionally enable or disable the returned writer based on a span or
+/// event's [`Metadata`].
+///
+/// [writer]: std::io::Write
+pub type OptionalWriter<T> = EitherWriter<T, std::io::Sink>;
+
+/// A [`MakeWriter`] combinator that only returns an enabled [writer] for spans
+/// and events with metadata at or below a specified verbosity [`Level`].
+///
+/// This is returned by the [`MakeWriterExt::with_max_level`] method. See the
+/// method documentation for details.
+///
+/// [writer]: std::io::Write
+/// [`Level`]: tracing_core::Level
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct WithMaxLevel<M> {
+ make: M,
+ level: tracing_core::Level,
+}
+
+/// A [`MakeWriter`] combinator that only returns an enabled [writer] for spans
+/// and events with metadata at or above a specified verbosity [`Level`].
+///
+/// This is returned by the [`MakeWriterExt::with_min_level`] method. See the
+/// method documentation for details.
+///
+/// [writer]: std::io::Write
+/// [`Level`]: tracing_core::Level
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct WithMinLevel<M> {
+ make: M,
+ level: tracing_core::Level,
+}
+
+/// A [`MakeWriter`] combinator that wraps a [`MakeWriter`] with a predicate for
+/// span and event [`Metadata`], so that the [`MakeWriter::make_writer_for`]
+/// method returns [`OptionalWriter::some`][ows] when the predicate returns `true`,
+/// and [`OptionalWriter::none`][own] when the predicate returns `false`.
+///
+/// This is returned by the [`MakeWriterExt::with_filter`] method. See the
+/// method documentation for details.
+///
+/// [`Metadata`]: tracing_core::Metadata
+/// [ows]: EitherWriter::some
+/// [own]: EitherWriter::none
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct WithFilter<M, F> {
+ make: M,
+ filter: F,
+}
+
+/// Combines a [`MakeWriter`] that returns an [`OptionalWriter`] with another
+/// [`MakeWriter`], so that the second [`MakeWriter`] is used when the first
+/// [`MakeWriter`] returns [`OptionalWriter::none`][own].
+///
+/// This is returned by the [`MakeWriterExt::or_else] method. See the
+/// method documentation for details.
+///
+/// [own]: EitherWriter::none
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct OrElse<A, B> {
+ inner: A,
+ or_else: B,
+}
+
+/// Combines two types implementing [`MakeWriter`] (or [`std::io::Write`]) to
+/// produce a writer that writes to both [`MakeWriter`]'s returned writers.
+///
+/// This is returned by the [`MakeWriterExt::and`] method. See the method
+/// documentation for details.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct Tee<A, B> {
+ a: A,
+ b: B,
+}
+
+/// A type implementing [`io::Write`] for a [`MutexGuard`] where the type
+/// inside the [`Mutex`] implements [`io::Write`].
+///
+/// This is used by the [`MakeWriter`] implementation for [`Mutex`], because
+/// [`MutexGuard`] itself will not implement [`io::Write`] — instead, it
+/// _dereferences_ to a type implementing [`io::Write`]. Because [`MakeWriter`]
+/// requires the `Writer` type to implement [`io::Write`], it's necessary to add
+/// a newtype that forwards the trait implementation.
+///
+/// [`io::Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
+/// [`MutexGuard`]: https://doc.rust-lang.org/std/sync/struct.MutexGuard.html
+/// [`Mutex`]: https://doc.rust-lang.org/std/sync/struct.Mutex.html
+/// [`MakeWriter`]: trait.MakeWriter.html
+#[derive(Debug)]
+pub struct MutexGuardWriter<'a, W>(MutexGuard<'a, W>);
+
+/// Implements [`std::io::Write`] for an [`Arc`]<W> where `&W: Write`.
+///
+/// This is an implementation detail of the [`MakeWriter`] impl for [`Arc`].
+#[derive(Clone, Debug)]
+pub struct ArcWriter<W>(Arc<W>);
+
+/// A bridge between `fmt::Write` and `io::Write`.
+///
+/// This is used by the timestamp formatting implementation for the `time`
+/// crate and by the JSON formatter. In both cases, this is needed because
+/// `tracing-subscriber`'s `FormatEvent`/`FormatTime` traits expect a
+/// `fmt::Write` implementation, while `serde_json::Serializer` and `time`'s
+/// `format_into` methods expect an `io::Write`.
+#[cfg(any(feature = "json", feature = "time"))]
+pub(in crate::fmt) struct WriteAdaptor<'a> {
+ fmt_write: &'a mut dyn fmt::Write,
+}
+
+impl<'a, F, W> MakeWriter<'a> for F
+where
+ F: Fn() -> W,
+ W: io::Write,
+{
+ type Writer = W;
+
+ fn make_writer(&'a self) -> Self::Writer {
+ (self)()
+ }
+}
+
+impl<'a, W> MakeWriter<'a> for Arc<W>
+where
+ &'a W: io::Write + 'a,
+{
+ type Writer = &'a W;
+ fn make_writer(&'a self) -> Self::Writer {
+ &*self
+ }
+}
+
+impl<'a> MakeWriter<'a> for std::fs::File {
+ type Writer = &'a std::fs::File;
+ fn make_writer(&'a self) -> Self::Writer {
+ self
+ }
+}
+
+// === impl TestWriter ===
+
+impl TestWriter {
+ /// Returns a new `TestWriter` with the default configuration.
+ pub fn new() -> Self {
+ Self::default()
+ }
+}
+
+impl io::Write for TestWriter {
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ let out_str = String::from_utf8_lossy(buf);
+ print!("{}", out_str);
+ Ok(buf.len())
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ Ok(())
+ }
+}
+
+impl<'a> MakeWriter<'a> for TestWriter {
+ type Writer = Self;
+
+ fn make_writer(&'a self) -> Self::Writer {
+ Self::default()
+ }
+}
+
+// === impl BoxMakeWriter ===
+
+impl BoxMakeWriter {
+ /// Constructs a `BoxMakeWriter` wrapping a type implementing [`MakeWriter`].
+ ///
+ /// [`MakeWriter`]: trait.MakeWriter.html
+ pub fn new<M>(make_writer: M) -> Self
+ where
+ M: for<'a> MakeWriter<'a> + Send + Sync + 'static,
+ {
+ Self {
+ inner: Box::new(Boxed(make_writer)),
+ name: std::any::type_name::<M>(),
+ }
+ }
+}
+
+impl fmt::Debug for BoxMakeWriter {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_tuple("BoxMakeWriter")
+ .field(&format_args!("<{}>", self.name))
+ .finish()
+ }
+}
+
+impl<'a> MakeWriter<'a> for BoxMakeWriter {
+ type Writer = Box<dyn Write + 'a>;
+
+ #[inline]
+ fn make_writer(&'a self) -> Self::Writer {
+ self.inner.make_writer()
+ }
+
+ #[inline]
+ fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer {
+ self.inner.make_writer_for(meta)
+ }
+}
+
+struct Boxed<M>(M);
+
+impl<'a, M> MakeWriter<'a> for Boxed<M>
+where
+ M: MakeWriter<'a>,
+{
+ type Writer = Box<dyn Write + 'a>;
+
+ fn make_writer(&'a self) -> Self::Writer {
+ let w = self.0.make_writer();
+ Box::new(w)
+ }
+
+ fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer {
+ let w = self.0.make_writer_for(meta);
+ Box::new(w)
+ }
+}
+
+// === impl Mutex/MutexGuardWriter ===
+
+impl<'a, W> MakeWriter<'a> for Mutex<W>
+where
+ W: io::Write + 'a,
+{
+ type Writer = MutexGuardWriter<'a, W>;
+
+ fn make_writer(&'a self) -> Self::Writer {
+ MutexGuardWriter(self.lock().expect("lock poisoned"))
+ }
+}
+
+impl<'a, W> io::Write for MutexGuardWriter<'a, W>
+where
+ W: io::Write,
+{
+ #[inline]
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ self.0.write(buf)
+ }
+
+ #[inline]
+ fn flush(&mut self) -> io::Result<()> {
+ self.0.flush()
+ }
+
+ #[inline]
+ fn write_vectored(&mut self, bufs: &[io::IoSlice<'_>]) -> io::Result<usize> {
+ self.0.write_vectored(bufs)
+ }
+
+ #[inline]
+ fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
+ self.0.write_all(buf)
+ }
+
+ #[inline]
+ fn write_fmt(&mut self, fmt: std::fmt::Arguments<'_>) -> io::Result<()> {
+ self.0.write_fmt(fmt)
+ }
+}
+
+// === impl EitherWriter ===
+
+impl<A, B> io::Write for EitherWriter<A, B>
+where
+ A: io::Write,
+ B: io::Write,
+{
+ #[inline]
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ match self {
+ EitherWriter::A(a) => a.write(buf),
+ EitherWriter::B(b) => b.write(buf),
+ }
+ }
+
+ #[inline]
+ fn flush(&mut self) -> io::Result<()> {
+ match self {
+ EitherWriter::A(a) => a.flush(),
+ EitherWriter::B(b) => b.flush(),
+ }
+ }
+
+ #[inline]
+ fn write_vectored(&mut self, bufs: &[io::IoSlice<'_>]) -> io::Result<usize> {
+ match self {
+ EitherWriter::A(a) => a.write_vectored(bufs),
+ EitherWriter::B(b) => b.write_vectored(bufs),
+ }
+ }
+
+ #[inline]
+ fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
+ match self {
+ EitherWriter::A(a) => a.write_all(buf),
+ EitherWriter::B(b) => b.write_all(buf),
+ }
+ }
+
+ #[inline]
+ fn write_fmt(&mut self, fmt: std::fmt::Arguments<'_>) -> io::Result<()> {
+ match self {
+ EitherWriter::A(a) => a.write_fmt(fmt),
+ EitherWriter::B(b) => b.write_fmt(fmt),
+ }
+ }
+}
+
+impl<T> OptionalWriter<T> {
+ /// Returns a [disabled writer].
+ ///
+ /// Any bytes written to the returned writer are discarded.
+ ///
+ /// This is equivalent to returning [`Option::None`].
+ ///
+ /// [disabled writer]: std::io::sink
+ #[inline]
+ pub fn none() -> Self {
+ EitherWriter::B(std::io::sink())
+ }
+
+ /// Returns an enabled writer of type `T`.
+ ///
+ /// This is equivalent to returning [`Option::Some`].
+ #[inline]
+ pub fn some(t: T) -> Self {
+ EitherWriter::A(t)
+ }
+}
+
+impl<T> From<Option<T>> for OptionalWriter<T> {
+ #[inline]
+ fn from(opt: Option<T>) -> Self {
+ match opt {
+ Some(writer) => Self::some(writer),
+ None => Self::none(),
+ }
+ }
+}
+
+// === impl WithMaxLevel ===
+
+impl<M> WithMaxLevel<M> {
+ /// Wraps the provided [`MakeWriter`] with a maximum [`Level`], so that it
+ /// returns [`OptionalWriter::none`] for spans and events whose level is
+ /// more verbose than the maximum level.
+ ///
+ /// See [`MakeWriterExt::with_max_level`] for details.
+ ///
+ /// [`Level`]: tracing_core::Level
+ pub fn new(make: M, level: tracing_core::Level) -> Self {
+ Self { make, level }
+ }
+}
+
+impl<'a, M: MakeWriter<'a>> MakeWriter<'a> for WithMaxLevel<M> {
+ type Writer = OptionalWriter<M::Writer>;
+
+ #[inline]
+ fn make_writer(&'a self) -> Self::Writer {
+ // If we don't know the level, assume it's disabled.
+ OptionalWriter::none()
+ }
+
+ #[inline]
+ fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer {
+ if meta.level() <= &self.level {
+ return OptionalWriter::some(self.make.make_writer_for(meta));
+ }
+ OptionalWriter::none()
+ }
+}
+
+// === impl WithMinLevel ===
+
+impl<M> WithMinLevel<M> {
+ /// Wraps the provided [`MakeWriter`] with a minimum [`Level`], so that it
+ /// returns [`OptionalWriter::none`] for spans and events whose level is
+ /// less verbose than the maximum level.
+ ///
+ /// See [`MakeWriterExt::with_min_level`] for details.
+ ///
+ /// [`Level`]: tracing_core::Level
+ pub fn new(make: M, level: tracing_core::Level) -> Self {
+ Self { make, level }
+ }
+}
+
+impl<'a, M: MakeWriter<'a>> MakeWriter<'a> for WithMinLevel<M> {
+ type Writer = OptionalWriter<M::Writer>;
+
+ #[inline]
+ fn make_writer(&'a self) -> Self::Writer {
+ // If we don't know the level, assume it's disabled.
+ OptionalWriter::none()
+ }
+
+ #[inline]
+ fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer {
+ if meta.level() >= &self.level {
+ return OptionalWriter::some(self.make.make_writer_for(meta));
+ }
+ OptionalWriter::none()
+ }
+}
+
+// ==== impl WithFilter ===
+
+impl<M, F> WithFilter<M, F> {
+ /// Wraps `make` with the provided `filter`, returning a [`MakeWriter`] that
+ /// will call `make.make_writer_for()` when `filter` returns `true` for a
+ /// span or event's [`Metadata`], and returns a [`sink`] otherwise.
+ ///
+ /// See [`MakeWriterExt::with_filter`] for details.
+ ///
+ /// [`Metadata`]: tracing_core::Metadata
+ /// [`sink`]: std::io::sink
+ pub fn new(make: M, filter: F) -> Self
+ where
+ F: Fn(&Metadata<'_>) -> bool,
+ {
+ Self { make, filter }
+ }
+}
+
+impl<'a, M, F> MakeWriter<'a> for WithFilter<M, F>
+where
+ M: MakeWriter<'a>,
+ F: Fn(&Metadata<'_>) -> bool,
+{
+ type Writer = OptionalWriter<M::Writer>;
+
+ #[inline]
+ fn make_writer(&'a self) -> Self::Writer {
+ OptionalWriter::some(self.make.make_writer())
+ }
+
+ #[inline]
+ fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer {
+ if (self.filter)(meta) {
+ OptionalWriter::some(self.make.make_writer_for(meta))
+ } else {
+ OptionalWriter::none()
+ }
+ }
+}
+
+// === impl Tee ===
+
+impl<A, B> Tee<A, B> {
+ /// Combines two types implementing [`MakeWriter`], returning
+ /// a new [`MakeWriter`] that produces [writers] that write to *both*
+ /// outputs.
+ ///
+ /// See the documentation for [`MakeWriterExt::and`] for details.
+ pub fn new(a: A, b: B) -> Self {
+ Self { a, b }
+ }
+}
+
+impl<'a, A, B> MakeWriter<'a> for Tee<A, B>
+where
+ A: MakeWriter<'a>,
+ B: MakeWriter<'a>,
+{
+ type Writer = Tee<A::Writer, B::Writer>;
+
+ #[inline]
+ fn make_writer(&'a self) -> Self::Writer {
+ Tee::new(self.a.make_writer(), self.b.make_writer())
+ }
+
+ #[inline]
+ fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer {
+ Tee::new(self.a.make_writer_for(meta), self.b.make_writer_for(meta))
+ }
+}
+
+macro_rules! impl_tee {
+ ($self_:ident.$f:ident($($arg:ident),*)) => {
+ {
+ let res_a = $self_.a.$f($($arg),*);
+ let res_b = $self_.b.$f($($arg),*);
+ (res_a?, res_b?)
+ }
+ }
+}
+
+impl<A, B> io::Write for Tee<A, B>
+where
+ A: io::Write,
+ B: io::Write,
+{
+ #[inline]
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ let (a, b) = impl_tee!(self.write(buf));
+ Ok(std::cmp::max(a, b))
+ }
+
+ #[inline]
+ fn flush(&mut self) -> io::Result<()> {
+ impl_tee!(self.flush());
+ Ok(())
+ }
+
+ #[inline]
+ fn write_vectored(&mut self, bufs: &[io::IoSlice<'_>]) -> io::Result<usize> {
+ let (a, b) = impl_tee!(self.write_vectored(bufs));
+ Ok(std::cmp::max(a, b))
+ }
+
+ #[inline]
+ fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
+ impl_tee!(self.write_all(buf));
+ Ok(())
+ }
+
+ #[inline]
+ fn write_fmt(&mut self, fmt: std::fmt::Arguments<'_>) -> io::Result<()> {
+ impl_tee!(self.write_fmt(fmt));
+ Ok(())
+ }
+}
+
+// === impl OrElse ===
+
+impl<A, B> OrElse<A, B> {
+ /// Combines
+ pub fn new<'a, W>(inner: A, or_else: B) -> Self
+ where
+ A: MakeWriter<'a, Writer = OptionalWriter<W>>,
+ B: MakeWriter<'a>,
+ W: Write,
+ {
+ Self { inner, or_else }
+ }
+}
+
+impl<'a, A, B, W> MakeWriter<'a> for OrElse<A, B>
+where
+ A: MakeWriter<'a, Writer = OptionalWriter<W>>,
+ B: MakeWriter<'a>,
+ W: io::Write,
+{
+ type Writer = EitherWriter<W, B::Writer>;
+
+ #[inline]
+ fn make_writer(&'a self) -> Self::Writer {
+ match self.inner.make_writer() {
+ EitherWriter::A(writer) => EitherWriter::A(writer),
+ EitherWriter::B(_) => EitherWriter::B(self.or_else.make_writer()),
+ }
+ }
+
+ #[inline]
+ fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer {
+ match self.inner.make_writer_for(meta) {
+ EitherWriter::A(writer) => EitherWriter::A(writer),
+ EitherWriter::B(_) => EitherWriter::B(self.or_else.make_writer_for(meta)),
+ }
+ }
+}
+
+// === impl ArcWriter ===
+
+impl<W> io::Write for ArcWriter<W>
+where
+ for<'a> &'a W: io::Write,
+{
+ #[inline]
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ (&*self.0).write(buf)
+ }
+
+ #[inline]
+ fn flush(&mut self) -> io::Result<()> {
+ (&*self.0).flush()
+ }
+
+ #[inline]
+ fn write_vectored(&mut self, bufs: &[io::IoSlice<'_>]) -> io::Result<usize> {
+ (&*self.0).write_vectored(bufs)
+ }
+
+ #[inline]
+ fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
+ (&*self.0).write_all(buf)
+ }
+
+ #[inline]
+ fn write_fmt(&mut self, fmt: std::fmt::Arguments<'_>) -> io::Result<()> {
+ (&*self.0).write_fmt(fmt)
+ }
+}
+
+// === impl WriteAdaptor ===
+
+#[cfg(any(feature = "json", feature = "time"))]
+impl<'a> WriteAdaptor<'a> {
+ pub(in crate::fmt) fn new(fmt_write: &'a mut dyn fmt::Write) -> Self {
+ Self { fmt_write }
+ }
+}
+#[cfg(any(feature = "json", feature = "time"))]
+impl<'a> io::Write for WriteAdaptor<'a> {
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ let s =
+ std::str::from_utf8(buf).map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))?;
+
+ self.fmt_write
+ .write_str(s)
+ .map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
+
+ Ok(s.as_bytes().len())
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ Ok(())
+ }
+}
+
+#[cfg(any(feature = "json", feature = "time"))]
+impl<'a> fmt::Debug for WriteAdaptor<'a> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.pad("WriteAdaptor { .. }")
+ }
+}
+// === blanket impls ===
+
+impl<'a, M> MakeWriterExt<'a> for M where M: MakeWriter<'a> {}
+#[cfg(test)]
+mod test {
+ use super::*;
+ use crate::fmt::format::Format;
+ use crate::fmt::test::{MockMakeWriter, MockWriter};
+ use crate::fmt::Subscriber;
+ use std::sync::atomic::{AtomicBool, Ordering};
+ use std::sync::{Arc, Mutex};
+ use tracing::{debug, error, info, trace, warn, Level};
+ use tracing_core::dispatcher::{self, Dispatch};
+
+ fn test_writer<T>(make_writer: T, msg: &str, buf: &Mutex<Vec<u8>>)
+ where
+ T: for<'writer> MakeWriter<'writer> + Send + Sync + 'static,
+ {
+ let subscriber = {
+ #[cfg(feature = "ansi")]
+ let f = Format::default().without_time().with_ansi(false);
+ #[cfg(not(feature = "ansi"))]
+ let f = Format::default().without_time();
+ Subscriber::builder()
+ .event_format(f)
+ .with_writer(make_writer)
+ .finish()
+ };
+ let dispatch = Dispatch::from(subscriber);
+
+ dispatcher::with_default(&dispatch, || {
+ error!("{}", msg);
+ });
+
+ let expected = format!("ERROR {}: {}\n", module_path!(), msg);
+ let actual = String::from_utf8(buf.try_lock().unwrap().to_vec()).unwrap();
+ assert!(actual.contains(expected.as_str()));
+ }
+
+ fn has_lines(buf: &Mutex<Vec<u8>>, msgs: &[(tracing::Level, &str)]) {
+ let actual = String::from_utf8(buf.try_lock().unwrap().to_vec()).unwrap();
+ let mut expected_lines = msgs.iter();
+ for line in actual.lines() {
+ let line = dbg!(line).trim();
+ let (level, msg) = expected_lines
+ .next()
+ .unwrap_or_else(|| panic!("expected no more lines, but got: {:?}", line));
+ let expected = format!("{} {}: {}", level, module_path!(), msg);
+ assert_eq!(line, expected.as_str());
+ }
+ }
+
+ #[test]
+ fn custom_writer_closure() {
+ let buf = Arc::new(Mutex::new(Vec::new()));
+ let buf2 = buf.clone();
+ let make_writer = move || MockWriter::new(buf2.clone());
+ let msg = "my custom writer closure error";
+ test_writer(make_writer, msg, &buf);
+ }
+
+ #[test]
+ fn custom_writer_struct() {
+ let buf = Arc::new(Mutex::new(Vec::new()));
+ let make_writer = MockMakeWriter::new(buf.clone());
+ let msg = "my custom writer struct error";
+ test_writer(make_writer, msg, &buf);
+ }
+
+ #[test]
+ fn custom_writer_mutex() {
+ let buf = Arc::new(Mutex::new(Vec::new()));
+ let writer = MockWriter::new(buf.clone());
+ let make_writer = Mutex::new(writer);
+ let msg = "my mutex writer error";
+ test_writer(make_writer, msg, &buf);
+ }
+
+ #[test]
+ fn combinators_level_filters() {
+ let info_buf = Arc::new(Mutex::new(Vec::new()));
+ let info = MockMakeWriter::new(info_buf.clone());
+
+ let debug_buf = Arc::new(Mutex::new(Vec::new()));
+ let debug = MockMakeWriter::new(debug_buf.clone());
+
+ let warn_buf = Arc::new(Mutex::new(Vec::new()));
+ let warn = MockMakeWriter::new(warn_buf.clone());
+
+ let err_buf = Arc::new(Mutex::new(Vec::new()));
+ let err = MockMakeWriter::new(err_buf.clone());
+
+ let make_writer = info
+ .with_max_level(Level::INFO)
+ .and(debug.with_max_level(Level::DEBUG))
+ .and(warn.with_max_level(Level::WARN))
+ .and(err.with_max_level(Level::ERROR));
+
+ let c = {
+ #[cfg(feature = "ansi")]
+ let f = Format::default().without_time().with_ansi(false);
+ #[cfg(not(feature = "ansi"))]
+ let f = Format::default().without_time();
+ Subscriber::builder()
+ .event_format(f)
+ .with_writer(make_writer)
+ .with_max_level(Level::TRACE)
+ .finish()
+ };
+
+ let _s = tracing::subscriber::set_default(c);
+
+ trace!("trace");
+ debug!("debug");
+ info!("info");
+ warn!("warn");
+ error!("error");
+
+ let all_lines = [
+ (Level::TRACE, "trace"),
+ (Level::DEBUG, "debug"),
+ (Level::INFO, "info"),
+ (Level::WARN, "warn"),
+ (Level::ERROR, "error"),
+ ];
+
+ println!("max level debug");
+ has_lines(&debug_buf, &all_lines[1..]);
+
+ println!("max level info");
+ has_lines(&info_buf, &all_lines[2..]);
+
+ println!("max level warn");
+ has_lines(&warn_buf, &all_lines[3..]);
+
+ println!("max level error");
+ has_lines(&err_buf, &all_lines[4..]);
+ }
+
+ #[test]
+ fn combinators_or_else() {
+ let some_buf = Arc::new(Mutex::new(Vec::new()));
+ let some = MockMakeWriter::new(some_buf.clone());
+
+ let or_else_buf = Arc::new(Mutex::new(Vec::new()));
+ let or_else = MockMakeWriter::new(or_else_buf.clone());
+
+ let return_some = AtomicBool::new(true);
+ let make_writer = move || {
+ if return_some.swap(false, Ordering::Relaxed) {
+ OptionalWriter::some(some.make_writer())
+ } else {
+ OptionalWriter::none()
+ }
+ };
+ let make_writer = make_writer.or_else(or_else);
+ let c = {
+ #[cfg(feature = "ansi")]
+ let f = Format::default().without_time().with_ansi(false);
+ #[cfg(not(feature = "ansi"))]
+ let f = Format::default().without_time();
+ Subscriber::builder()
+ .event_format(f)
+ .with_writer(make_writer)
+ .with_max_level(Level::TRACE)
+ .finish()
+ };
+
+ let _s = tracing::subscriber::set_default(c);
+ info!("hello");
+ info!("world");
+ info!("goodbye");
+
+ has_lines(&some_buf, &[(Level::INFO, "hello")]);
+ has_lines(
+ &or_else_buf,
+ &[(Level::INFO, "world"), (Level::INFO, "goodbye")],
+ );
+ }
+
+ #[test]
+ fn combinators_or_else_chain() {
+ let info_buf = Arc::new(Mutex::new(Vec::new()));
+ let info = MockMakeWriter::new(info_buf.clone());
+
+ let debug_buf = Arc::new(Mutex::new(Vec::new()));
+ let debug = MockMakeWriter::new(debug_buf.clone());
+
+ let warn_buf = Arc::new(Mutex::new(Vec::new()));
+ let warn = MockMakeWriter::new(warn_buf.clone());
+
+ let err_buf = Arc::new(Mutex::new(Vec::new()));
+ let err = MockMakeWriter::new(err_buf.clone());
+
+ let make_writer = err.with_max_level(Level::ERROR).or_else(
+ warn.with_max_level(Level::WARN).or_else(
+ info.with_max_level(Level::INFO)
+ .or_else(debug.with_max_level(Level::DEBUG)),
+ ),
+ );
+
+ let c = {
+ #[cfg(feature = "ansi")]
+ let f = Format::default().without_time().with_ansi(false);
+ #[cfg(not(feature = "ansi"))]
+ let f = Format::default().without_time();
+ Subscriber::builder()
+ .event_format(f)
+ .with_writer(make_writer)
+ .with_max_level(Level::TRACE)
+ .finish()
+ };
+
+ let _s = tracing::subscriber::set_default(c);
+
+ trace!("trace");
+ debug!("debug");
+ info!("info");
+ warn!("warn");
+ error!("error");
+
+ println!("max level debug");
+ has_lines(&debug_buf, &[(Level::DEBUG, "debug")]);
+
+ println!("max level info");
+ has_lines(&info_buf, &[(Level::INFO, "info")]);
+
+ println!("max level warn");
+ has_lines(&warn_buf, &[(Level::WARN, "warn")]);
+
+ println!("max level error");
+ has_lines(&err_buf, &[(Level::ERROR, "error")]);
+ }
+
+ #[test]
+ fn combinators_and() {
+ let a_buf = Arc::new(Mutex::new(Vec::new()));
+ let a = MockMakeWriter::new(a_buf.clone());
+
+ let b_buf = Arc::new(Mutex::new(Vec::new()));
+ let b = MockMakeWriter::new(b_buf.clone());
+
+ let lines = &[(Level::INFO, "hello"), (Level::INFO, "world")];
+
+ let make_writer = a.and(b);
+ let c = {
+ #[cfg(feature = "ansi")]
+ let f = Format::default().without_time().with_ansi(false);
+ #[cfg(not(feature = "ansi"))]
+ let f = Format::default().without_time();
+ Subscriber::builder()
+ .event_format(f)
+ .with_writer(make_writer)
+ .with_max_level(Level::TRACE)
+ .finish()
+ };
+
+ let _s = tracing::subscriber::set_default(c);
+ info!("hello");
+ info!("world");
+
+ has_lines(&a_buf, &lines[..]);
+ has_lines(&b_buf, &lines[..]);
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/layer/context.rs b/vendor/tracing-subscriber-0.3.3/src/layer/context.rs
new file mode 100644
index 000000000..e11959526
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/layer/context.rs
@@ -0,0 +1,434 @@
+use tracing_core::{metadata::Metadata, span, subscriber::Subscriber, Event};
+
+use crate::registry::{self, LookupSpan, SpanRef};
+
+#[cfg(all(feature = "registry", feature = "std"))]
+use crate::{filter::FilterId, registry::Registry};
+/// Represents information about the current context provided to [`Layer`]s by the
+/// wrapped [`Subscriber`].
+///
+/// To access [stored data] keyed by a span ID, implementors of the `Layer`
+/// trait should ensure that the `Subscriber` type parameter is *also* bound by the
+/// [`LookupSpan`]:
+///
+/// ```rust
+/// use tracing::Subscriber;
+/// use tracing_subscriber::{Layer, registry::LookupSpan};
+///
+/// pub struct MyLayer;
+///
+/// impl<S> Layer<S> for MyLayer
+/// where
+/// S: Subscriber + for<'a> LookupSpan<'a>,
+/// {
+/// // ...
+/// }
+/// ```
+///
+/// [`Layer`]: ../layer/trait.Layer.html
+/// [`Subscriber`]: https://docs.rs/tracing-core/latest/tracing_core/trait.Subscriber.html
+/// [stored data]: ../registry/struct.SpanRef.html
+/// [`LookupSpan`]: "../registry/trait.LookupSpan.html
+#[derive(Debug)]
+pub struct Context<'a, S> {
+ subscriber: Option<&'a S>,
+ /// The bitmask of all [`Filtered`] layers that currently apply in this
+ /// context. If there is only a single [`Filtered`] wrapping the layer that
+ /// produced this context, then this is that filter's ID. Otherwise, if we
+ /// are in a nested tree with multiple filters, this is produced by
+ /// [`and`]-ing together the [`FilterId`]s of each of the filters that wrap
+ /// the current layer.
+ ///
+ /// [`Filtered`]: crate::filter::Filtered
+ /// [`FilterId`]: crate::filter::FilterId
+ /// [`and`]: crate::filter::FilterId::and
+ #[cfg(all(feature = "registry", feature = "std"))]
+ filter: FilterId,
+}
+
+// === impl Context ===
+
+impl<'a, S> Context<'a, S>
+where
+ S: Subscriber,
+{
+ pub(super) fn new(subscriber: &'a S) -> Self {
+ Self {
+ subscriber: Some(subscriber),
+
+ #[cfg(feature = "registry")]
+ filter: FilterId::none(),
+ }
+ }
+
+ /// Returns the wrapped subscriber's view of the current span.
+ #[inline]
+ pub fn current_span(&self) -> span::Current {
+ self.subscriber
+ .map(Subscriber::current_span)
+ // TODO: this would be more correct as "unknown", so perhaps
+ // `tracing-core` should make `Current::unknown()` public?
+ .unwrap_or_else(span::Current::none)
+ }
+
+ /// Returns whether the wrapped subscriber would enable the current span.
+ #[inline]
+ pub fn enabled(&self, metadata: &Metadata<'_>) -> bool {
+ self.subscriber
+ .map(|subscriber| subscriber.enabled(metadata))
+ // If this context is `None`, we are registering a callsite, so
+ // return `true` so that the layer does not incorrectly assume that
+ // the inner subscriber has disabled this metadata.
+ // TODO(eliza): would it be more correct for this to return an `Option`?
+ .unwrap_or(true)
+ }
+
+ /// Records the provided `event` with the wrapped subscriber.
+ ///
+ /// # Notes
+ ///
+ /// - The subscriber is free to expect that the event's callsite has been
+ /// [registered][register], and may panic or fail to observe the event if this is
+ /// not the case. The `tracing` crate's macros ensure that all events are
+ /// registered, but if the event is constructed through other means, the
+ /// user is responsible for ensuring that [`register_callsite`][register]
+ /// has been called prior to calling this method.
+ /// - This does _not_ call [`enabled`] on the inner subscriber. If the
+ /// caller wishes to apply the wrapped subscriber's filter before choosing
+ /// whether to record the event, it may first call [`Context::enabled`] to
+ /// check whether the event would be enabled. This allows `Layer`s to
+ /// elide constructing the event if it would not be recorded.
+ ///
+ /// [register]: https://docs.rs/tracing-core/latest/tracing_core/subscriber/trait.Subscriber.html#method.register_callsite
+ /// [`enabled`]: https://docs.rs/tracing-core/latest/tracing_core/subscriber/trait.Subscriber.html#method.enabled
+ /// [`Context::enabled`]: #method.enabled
+ #[inline]
+ pub fn event(&self, event: &Event<'_>) {
+ if let Some(subscriber) = self.subscriber {
+ subscriber.event(event);
+ }
+ }
+
+ /// Returns a [`SpanRef`] for the parent span of the given [`Event`], if
+ /// it has a parent.
+ ///
+ /// If the event has an explicitly overridden parent, this method returns
+ /// a reference to that span. If the event's parent is the current span,
+ /// this returns a reference to the current span, if there is one. If this
+ /// returns `None`, then either the event's parent was explicitly set to
+ /// `None`, or the event's parent was defined contextually, but no span
+ /// is currently entered.
+ ///
+ /// Compared to [`Context::current_span`] and [`Context::lookup_current`],
+ /// this respects overrides provided by the [`Event`].
+ ///
+ /// Compared to [`Event::parent`], this automatically falls back to the contextual
+ /// span, if required.
+ ///
+ /// ```rust
+ /// use tracing::{Event, Subscriber};
+ /// use tracing_subscriber::{
+ /// layer::{Context, Layer},
+ /// prelude::*,
+ /// registry::LookupSpan,
+ /// };
+ ///
+ /// struct PrintingLayer;
+ /// impl<S> Layer<S> for PrintingLayer
+ /// where
+ /// S: Subscriber + for<'lookup> LookupSpan<'lookup>,
+ /// {
+ /// fn on_event(&self, event: &Event, ctx: Context<S>) {
+ /// let span = ctx.event_span(event);
+ /// println!("Event in span: {:?}", span.map(|s| s.name()));
+ /// }
+ /// }
+ ///
+ /// tracing::subscriber::with_default(tracing_subscriber::registry().with(PrintingLayer), || {
+ /// tracing::info!("no span");
+ /// // Prints: Event in span: None
+ ///
+ /// let span = tracing::info_span!("span");
+ /// tracing::info!(parent: &span, "explicitly specified");
+ /// // Prints: Event in span: Some("span")
+ ///
+ /// let _guard = span.enter();
+ /// tracing::info!("contextual span");
+ /// // Prints: Event in span: Some("span")
+ /// });
+ /// ```
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: This requires the wrapped subscriber to
+ /// implement the <a href="../registry/trait.LookupSpan.html"><code>
+ /// LookupSpan</code></a> trait. See the documentation on
+ /// <a href="./struct.Context.html"><code>Context</code>'s
+ /// declaration</a> for details.
+ /// </pre>
+ #[inline]
+ pub fn event_span(&self, event: &Event<'_>) -> Option<SpanRef<'_, S>>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ if event.is_root() {
+ None
+ } else if event.is_contextual() {
+ self.lookup_current()
+ } else {
+ // TODO(eliza): this should handle parent IDs
+ event.parent().and_then(|id| self.span(id))
+ }
+ }
+
+ /// Returns metadata for the span with the given `id`, if it exists.
+ ///
+ /// If this returns `None`, then no span exists for that ID (either it has
+ /// closed or the ID is invalid).
+ #[inline]
+ pub fn metadata(&self, id: &span::Id) -> Option<&'static Metadata<'static>>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ let span = self.span(id)?;
+ Some(span.metadata())
+ }
+
+ /// Returns [stored data] for the span with the given `id`, if it exists.
+ ///
+ /// If this returns `None`, then no span exists for that ID (either it has
+ /// closed or the ID is invalid).
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: This requires the wrapped subscriber to
+ /// implement the <a href="../registry/trait.LookupSpan.html"><code>
+ /// LookupSpan</code></a> trait. See the documentation on
+ /// <a href="./struct.Context.html"><code>Context</code>'s
+ /// declaration</a> for details.
+ /// </pre>
+ ///
+ /// [stored data]: ../registry/struct.SpanRef.html
+ #[inline]
+ pub fn span(&self, id: &span::Id) -> Option<registry::SpanRef<'_, S>>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ let span = self.subscriber.as_ref()?.span(id)?;
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ return span.try_with_filter(self.filter);
+
+ #[cfg(not(feature = "registry"))]
+ Some(span)
+ }
+
+ /// Returns `true` if an active span exists for the given `Id`.
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: This requires the wrapped subscriber to
+ /// implement the <a href="../registry/trait.LookupSpan.html"><code>
+ /// LookupSpan</code></a> trait. See the documentation on
+ /// <a href="./struct.Context.html"><code>Context</code>'s
+ /// declaration</a> for details.
+ /// </pre>
+ #[inline]
+ pub fn exists(&self, id: &span::Id) -> bool
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ self.subscriber.as_ref().and_then(|s| s.span(id)).is_some()
+ }
+
+ /// Returns [stored data] for the span that the wrapped subscriber considers
+ /// to be the current.
+ ///
+ /// If this returns `None`, then we are not currently within a span.
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: This requires the wrapped subscriber to
+ /// implement the <a href="../registry/trait.LookupSpan.html"><code>
+ /// LookupSpan</code></a> trait. See the documentation on
+ /// <a href="./struct.Context.html"><code>Context</code>'s
+ /// declaration</a> for details.
+ /// </pre>
+ ///
+ /// [stored data]: ../registry/struct.SpanRef.html
+ #[inline]
+ pub fn lookup_current(&self) -> Option<registry::SpanRef<'_, S>>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ let subscriber = *self.subscriber.as_ref()?;
+ let current = subscriber.current_span();
+ let id = current.id()?;
+ let span = subscriber.span(id);
+ debug_assert!(
+ span.is_some(),
+ "the subscriber should have data for the current span ({:?})!",
+ id,
+ );
+
+ // If we found a span, and our per-layer filter enables it, return that
+ // span!
+ #[cfg(all(feature = "registry", feature = "std"))]
+ {
+ if let Some(span) = span?.try_with_filter(self.filter) {
+ Some(span)
+ } else {
+ // Otherwise, the span at the *top* of the stack is disabled by
+ // per-layer filtering, but there may be additional spans in the stack.
+ //
+ // Currently, `LookupSpan` doesn't have a nice way of exposing access to
+ // the whole span stack. However, if we can downcast the innermost
+ // subscriber to a a `Registry`, we can iterate over its current span
+ // stack.
+ //
+ // TODO(eliza): when https://github.com/tokio-rs/tracing/issues/1459 is
+ // implemented, change this to use that instead...
+ self.lookup_current_filtered(subscriber)
+ }
+ }
+
+ #[cfg(not(feature = "registry"))]
+ span
+ }
+
+ /// Slow path for when the current span is disabled by PLF and we have a
+ /// registry.
+ // This is called by `lookup_current` in the case that per-layer filtering
+ // is in use. `lookup_current` is allowed to be inlined, but this method is
+ // factored out to prevent the loop and (potentially-recursive) subscriber
+ // downcasting from being inlined if `lookup_current` is inlined.
+ #[inline(never)]
+ #[cfg(all(feature = "registry", feature = "std"))]
+ fn lookup_current_filtered<'lookup>(
+ &self,
+ subscriber: &'lookup S,
+ ) -> Option<registry::SpanRef<'lookup, S>>
+ where
+ S: LookupSpan<'lookup>,
+ {
+ let registry = (subscriber as &dyn Subscriber).downcast_ref::<Registry>()?;
+ registry
+ .span_stack()
+ .iter()
+ .find_map(|id| subscriber.span(id)?.try_with_filter(self.filter))
+ }
+
+ /// Returns an iterator over the [stored data] for all the spans in the
+ /// current context, starting with the specified span and ending with the
+ /// root of the trace tree and ending with the current span.
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: Compared to <a href="#method.scope"><code>scope</code></a> this
+ /// returns the spans in reverse order (from leaf to root). Use
+ /// <a href="../registry/struct.Scope.html#method.from_root"><code>Scope::from_root</code></a>
+ /// in case root-to-leaf ordering is desired.
+ /// </pre>
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: This requires the wrapped subscriber to
+ /// implement the <a href="../registry/trait.LookupSpan.html"><code>
+ /// LookupSpan</code></a> trait. See the documentation on
+ /// <a href="./struct.Context.html"><code>Context</code>'s
+ /// declaration</a> for details.
+ /// </pre>
+ ///
+ /// [stored data]: ../registry/struct.SpanRef.html
+ pub fn span_scope(&self, id: &span::Id) -> Option<registry::Scope<'_, S>>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ Some(self.span(id)?.scope())
+ }
+
+ /// Returns an iterator over the [stored data] for all the spans in the
+ /// current context, starting with the parent span of the specified event,
+ /// and ending with the root of the trace tree and ending with the current span.
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: Compared to <a href="#method.scope"><code>scope</code></a> this
+ /// returns the spans in reverse order (from leaf to root). Use
+ /// <a href="../registry/struct.Scope.html#method.from_root"><code>Scope::from_root</code></a>
+ /// in case root-to-leaf ordering is desired.
+ /// </pre>
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: This requires the wrapped subscriber to
+ /// implement the <a href="../registry/trait.LookupSpan.html"><code>
+ /// LookupSpan</code></a> trait. See the documentation on
+ /// <a href="./struct.Context.html"><code>Context</code>'s
+ /// declaration</a> for details.
+ /// </pre>
+ ///
+ /// [stored data]: ../registry/struct.SpanRef.html
+ pub fn event_scope(&self, event: &Event<'_>) -> Option<registry::Scope<'_, S>>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ Some(self.event_span(event)?.scope())
+ }
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ pub(crate) fn with_filter(self, filter: FilterId) -> Self {
+ // If we already have our own `FilterId`, combine it with the provided
+ // one. That way, the new `FilterId` will consider a span to be disabled
+ // if it was disabled by the given `FilterId` *or* any `FilterId`s for
+ // layers "above" us in the stack.
+ //
+ // See the doc comment for `FilterId::and` for details.
+ let filter = self.filter.and(filter);
+ Self { filter, ..self }
+ }
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ pub(crate) fn is_enabled_for(&self, span: &span::Id, filter: FilterId) -> bool
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ self.is_enabled_inner(span, filter).unwrap_or(false)
+ }
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ pub(crate) fn if_enabled_for(self, span: &span::Id, filter: FilterId) -> Option<Self>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ if self.is_enabled_inner(span, filter)? {
+ Some(self.with_filter(filter))
+ } else {
+ None
+ }
+ }
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ fn is_enabled_inner(&self, span: &span::Id, filter: FilterId) -> Option<bool>
+ where
+ S: for<'lookup> LookupSpan<'lookup>,
+ {
+ Some(self.span(span)?.is_enabled_for(filter))
+ }
+}
+
+impl<'a, S> Context<'a, S> {
+ pub(crate) fn none() -> Self {
+ Self {
+ subscriber: None,
+
+ #[cfg(feature = "registry")]
+ filter: FilterId::none(),
+ }
+ }
+}
+
+impl<'a, S> Clone for Context<'a, S> {
+ #[inline]
+ fn clone(&self) -> Self {
+ let subscriber = self.subscriber.as_ref().copied();
+ Context {
+ subscriber,
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ filter: self.filter,
+ }
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/layer/layered.rs b/vendor/tracing-subscriber-0.3.3/src/layer/layered.rs
new file mode 100644
index 000000000..c690764ad
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/layer/layered.rs
@@ -0,0 +1,471 @@
+use tracing_core::{
+ metadata::Metadata,
+ span,
+ subscriber::{Interest, Subscriber},
+ Event, LevelFilter,
+};
+
+use crate::{
+ filter,
+ layer::{Context, Layer},
+ registry::LookupSpan,
+};
+#[cfg(all(feature = "registry", feature = "std"))]
+use crate::{filter::FilterId, registry::Registry};
+use core::{any::TypeId, cmp, fmt, marker::PhantomData};
+
+/// A [`Subscriber`] composed of a `Subscriber` wrapped by one or more
+/// [`Layer`]s.
+///
+/// [`Layer`]: crate::Layer
+/// [`Subscriber`]: https://docs.rs/tracing-core/latest/tracing_core/trait.Subscriber.html
+#[derive(Clone)]
+pub struct Layered<L, I, S = I> {
+ /// The layer.
+ layer: L,
+
+ /// The inner value that `self.layer` was layered onto.
+ ///
+ /// If this is also a `Layer`, then this `Layered` will implement `Layer`.
+ /// If this is a `Subscriber`, then this `Layered` will implement
+ /// `Subscriber` instead.
+ inner: I,
+
+ // These booleans are used to determine how to combine `Interest`s and max
+ // level hints when per-layer filters are in use.
+ /// Is `self.inner` a `Registry`?
+ ///
+ /// If so, when combining `Interest`s, we want to "bubble up" its
+ /// `Interest`.
+ inner_is_registry: bool,
+
+ /// Does `self.layer` have per-layer filters?
+ ///
+ /// This will be true if:
+ /// - `self.inner` is a `Filtered`.
+ /// - `self.inner` is a tree of `Layered`s where _all_ arms of those
+ /// `Layered`s have per-layer filters.
+ ///
+ /// Otherwise, if it's a `Layered` with one per-layer filter in one branch,
+ /// but a non-per-layer-filtered layer in the other branch, this will be
+ /// _false_, because the `Layered` is already handling the combining of
+ /// per-layer filter `Interest`s and max level hints with its non-filtered
+ /// `Layer`.
+ has_layer_filter: bool,
+
+ /// Does `self.inner` have per-layer filters?
+ ///
+ /// This is determined according to the same rules as
+ /// `has_layer_filter` above.
+ inner_has_layer_filter: bool,
+ _s: PhantomData<fn(S)>,
+}
+
+// === impl Layered ===
+
+impl<L, S> Subscriber for Layered<L, S>
+where
+ L: Layer<S>,
+ S: Subscriber,
+{
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ self.pick_interest(self.layer.register_callsite(metadata), || {
+ self.inner.register_callsite(metadata)
+ })
+ }
+
+ fn enabled(&self, metadata: &Metadata<'_>) -> bool {
+ if self.layer.enabled(metadata, self.ctx()) {
+ // if the outer layer enables the callsite metadata, ask the subscriber.
+ self.inner.enabled(metadata)
+ } else {
+ // otherwise, the callsite is disabled by the layer
+
+ // If per-layer filters are in use, and we are short-circuiting
+ // (rather than calling into the inner type), clear the current
+ // per-layer filter `enabled` state.
+ #[cfg(feature = "registry")]
+ filter::FilterState::clear_enabled();
+
+ false
+ }
+ }
+
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ self.pick_level_hint(self.layer.max_level_hint(), self.inner.max_level_hint())
+ }
+
+ fn new_span(&self, span: &span::Attributes<'_>) -> span::Id {
+ let id = self.inner.new_span(span);
+ self.layer.on_new_span(span, &id, self.ctx());
+ id
+ }
+
+ fn record(&self, span: &span::Id, values: &span::Record<'_>) {
+ self.inner.record(span, values);
+ self.layer.on_record(span, values, self.ctx());
+ }
+
+ fn record_follows_from(&self, span: &span::Id, follows: &span::Id) {
+ self.inner.record_follows_from(span, follows);
+ self.layer.on_follows_from(span, follows, self.ctx());
+ }
+
+ fn event(&self, event: &Event<'_>) {
+ self.inner.event(event);
+ self.layer.on_event(event, self.ctx());
+ }
+
+ fn enter(&self, span: &span::Id) {
+ self.inner.enter(span);
+ self.layer.on_enter(span, self.ctx());
+ }
+
+ fn exit(&self, span: &span::Id) {
+ self.inner.exit(span);
+ self.layer.on_exit(span, self.ctx());
+ }
+
+ fn clone_span(&self, old: &span::Id) -> span::Id {
+ let new = self.inner.clone_span(old);
+ if &new != old {
+ self.layer.on_id_change(old, &new, self.ctx())
+ };
+ new
+ }
+
+ #[inline]
+ fn drop_span(&self, id: span::Id) {
+ self.try_close(id);
+ }
+
+ fn try_close(&self, id: span::Id) -> bool {
+ #[cfg(all(feature = "registry", feature = "std"))]
+ let subscriber = &self.inner as &dyn Subscriber;
+ #[cfg(all(feature = "registry", feature = "std"))]
+ let mut guard = subscriber
+ .downcast_ref::<Registry>()
+ .map(|registry| registry.start_close(id.clone()));
+ if self.inner.try_close(id.clone()) {
+ // If we have a registry's close guard, indicate that the span is
+ // closing.
+ #[cfg(all(feature = "registry", feature = "std"))]
+ {
+ if let Some(g) = guard.as_mut() {
+ g.is_closing()
+ };
+ }
+
+ self.layer.on_close(id, self.ctx());
+ true
+ } else {
+ false
+ }
+ }
+
+ #[inline]
+ fn current_span(&self) -> span::Current {
+ self.inner.current_span()
+ }
+
+ #[doc(hidden)]
+ unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()> {
+ // Unlike the implementation of `Layer` for `Layered`, we don't have to
+ // handle the "magic PLF downcast marker" here. If a `Layered`
+ // implements `Subscriber`, we already know that the `inner` branch is
+ // going to contain something that doesn't have per-layer filters (the
+ // actual root `Subscriber`). Thus, a `Layered` that implements
+ // `Subscriber` will always be propagating the root subscriber's
+ // `Interest`/level hint, even if it includes a `Layer` that has
+ // per-layer filters, because it will only ever contain layers where
+ // _one_ child has per-layer filters.
+ //
+ // The complex per-layer filter detection logic is only relevant to
+ // *trees* of layers, which involve the `Layer` implementation for
+ // `Layered`, not *lists* of layers, where every `Layered` implements
+ // `Subscriber`. Of course, a linked list can be thought of as a
+ // degenerate tree...but luckily, we are able to make a type-level
+ // distinction between individual `Layered`s that are definitely
+ // list-shaped (their inner child implements `Subscriber`), and
+ // `Layered`s that might be tree-shaped (the inner child is also a
+ // `Layer`).
+
+ // If downcasting to `Self`, return a pointer to `self`.
+ if id == TypeId::of::<Self>() {
+ return Some(self as *const _ as *const ());
+ }
+
+ self.layer
+ .downcast_raw(id)
+ .or_else(|| self.inner.downcast_raw(id))
+ }
+}
+
+impl<S, A, B> Layer<S> for Layered<A, B, S>
+where
+ A: Layer<S>,
+ B: Layer<S>,
+ S: Subscriber,
+{
+ fn on_layer(&mut self, subscriber: &mut S) {
+ self.layer.on_layer(subscriber);
+ self.inner.on_layer(subscriber);
+ }
+
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ self.pick_interest(self.layer.register_callsite(metadata), || {
+ self.inner.register_callsite(metadata)
+ })
+ }
+
+ fn enabled(&self, metadata: &Metadata<'_>, ctx: Context<'_, S>) -> bool {
+ if self.layer.enabled(metadata, ctx.clone()) {
+ // if the outer subscriber enables the callsite metadata, ask the inner layer.
+ self.inner.enabled(metadata, ctx)
+ } else {
+ // otherwise, the callsite is disabled by this layer
+ false
+ }
+ }
+
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ self.pick_level_hint(self.layer.max_level_hint(), self.inner.max_level_hint())
+ }
+
+ #[inline]
+ fn on_new_span(&self, attrs: &span::Attributes<'_>, id: &span::Id, ctx: Context<'_, S>) {
+ self.inner.on_new_span(attrs, id, ctx.clone());
+ self.layer.on_new_span(attrs, id, ctx);
+ }
+
+ #[inline]
+ fn on_record(&self, span: &span::Id, values: &span::Record<'_>, ctx: Context<'_, S>) {
+ self.inner.on_record(span, values, ctx.clone());
+ self.layer.on_record(span, values, ctx);
+ }
+
+ #[inline]
+ fn on_follows_from(&self, span: &span::Id, follows: &span::Id, ctx: Context<'_, S>) {
+ self.inner.on_follows_from(span, follows, ctx.clone());
+ self.layer.on_follows_from(span, follows, ctx);
+ }
+
+ #[inline]
+ fn on_event(&self, event: &Event<'_>, ctx: Context<'_, S>) {
+ self.inner.on_event(event, ctx.clone());
+ self.layer.on_event(event, ctx);
+ }
+
+ #[inline]
+ fn on_enter(&self, id: &span::Id, ctx: Context<'_, S>) {
+ self.inner.on_enter(id, ctx.clone());
+ self.layer.on_enter(id, ctx);
+ }
+
+ #[inline]
+ fn on_exit(&self, id: &span::Id, ctx: Context<'_, S>) {
+ self.inner.on_exit(id, ctx.clone());
+ self.layer.on_exit(id, ctx);
+ }
+
+ #[inline]
+ fn on_close(&self, id: span::Id, ctx: Context<'_, S>) {
+ self.inner.on_close(id.clone(), ctx.clone());
+ self.layer.on_close(id, ctx);
+ }
+
+ #[inline]
+ fn on_id_change(&self, old: &span::Id, new: &span::Id, ctx: Context<'_, S>) {
+ self.inner.on_id_change(old, new, ctx.clone());
+ self.layer.on_id_change(old, new, ctx);
+ }
+
+ #[doc(hidden)]
+ unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()> {
+ match id {
+ // If downcasting to `Self`, return a pointer to `self`.
+ id if id == TypeId::of::<Self>() => Some(self as *const _ as *const ()),
+
+ // Oh, we're looking for per-layer filters!
+ //
+ // This should only happen if we are inside of another `Layered`,
+ // and it's trying to determine how it should combine `Interest`s
+ // and max level hints.
+ //
+ // In that case, this `Layered` should be considered to be
+ // "per-layer filtered" if *both* the outer layer and the inner
+ // layer/subscriber have per-layer filters. Otherwise, this `Layered
+ // should *not* be considered per-layer filtered (even if one or the
+ // other has per layer filters). If only one `Layer` is per-layer
+ // filtered, *this* `Layered` will handle aggregating the `Interest`
+ // and level hints on behalf of its children, returning the
+ // aggregate (which is the value from the &non-per-layer-filtered*
+ // child).
+ //
+ // Yes, this rule *is* slightly counter-intuitive, but it's
+ // necessary due to a weird edge case that can occur when two
+ // `Layered`s where one side is per-layer filtered and the other
+ // isn't are `Layered` together to form a tree. If we didn't have
+ // this rule, we would actually end up *ignoring* `Interest`s from
+ // the non-per-layer-filtered layers, since both branches would
+ // claim to have PLF.
+ //
+ // If you don't understand this...that's fine, just don't mess with
+ // it. :)
+ id if filter::is_plf_downcast_marker(id) => {
+ self.layer.downcast_raw(id).and(self.inner.downcast_raw(id))
+ }
+
+ // Otherwise, try to downcast both branches normally...
+ _ => self
+ .layer
+ .downcast_raw(id)
+ .or_else(|| self.inner.downcast_raw(id)),
+ }
+ }
+}
+
+impl<'a, L, S> LookupSpan<'a> for Layered<L, S>
+where
+ S: Subscriber + LookupSpan<'a>,
+{
+ type Data = S::Data;
+
+ fn span_data(&'a self, id: &span::Id) -> Option<Self::Data> {
+ self.inner.span_data(id)
+ }
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ fn register_filter(&mut self) -> FilterId {
+ self.inner.register_filter()
+ }
+}
+
+impl<L, S> Layered<L, S>
+where
+ S: Subscriber,
+{
+ fn ctx(&self) -> Context<'_, S> {
+ Context::new(&self.inner)
+ }
+}
+
+impl<A, B, S> Layered<A, B, S>
+where
+ A: Layer<S>,
+ S: Subscriber,
+{
+ pub(super) fn new(layer: A, inner: B, inner_has_layer_filter: bool) -> Self {
+ #[cfg(all(feature = "registry", feature = "std"))]
+ let inner_is_registry = TypeId::of::<S>() == TypeId::of::<crate::registry::Registry>();
+
+ #[cfg(not(all(feature = "registry", feature = "std")))]
+ let inner_is_registry = false;
+
+ let inner_has_layer_filter = inner_has_layer_filter || inner_is_registry;
+ let has_layer_filter = filter::layer_has_plf(&layer);
+ Self {
+ layer,
+ inner,
+ has_layer_filter,
+ inner_has_layer_filter,
+ inner_is_registry,
+ _s: PhantomData,
+ }
+ }
+
+ fn pick_interest(&self, outer: Interest, inner: impl FnOnce() -> Interest) -> Interest {
+ if self.has_layer_filter {
+ return inner();
+ }
+
+ // If the outer layer has disabled the callsite, return now so that
+ // the inner layer/subscriber doesn't get its hopes up.
+ if outer.is_never() {
+ // If per-layer filters are in use, and we are short-circuiting
+ // (rather than calling into the inner type), clear the current
+ // per-layer filter interest state.
+ #[cfg(feature = "registry")]
+ drop(filter::FilterState::take_interest());
+
+ return outer;
+ }
+
+ // The `inner` closure will call `inner.register_callsite()`. We do this
+ // before the `if` statement to ensure that the inner subscriber is
+ // informed that the callsite exists regardless of the outer layer's
+ // filtering decision.
+ let inner = inner();
+ if outer.is_sometimes() {
+ // if this interest is "sometimes", return "sometimes" to ensure that
+ // filters are reevaluated.
+ return outer;
+ }
+
+ // If there is a per-layer filter in the `inner` stack, and it returns
+ // `never`, change the interest to `sometimes`, because the `outer`
+ // layer didn't return `never`. This means that _some_ layer still wants
+ // to see that callsite, even though the inner stack's per-layer filter
+ // didn't want it. Therefore, returning `sometimes` will ensure
+ // `enabled` is called so that the per-layer filter can skip that
+ // span/event, while the `outer` layer still gets to see it.
+ if inner.is_never() && self.inner_has_layer_filter {
+ return Interest::sometimes();
+ }
+
+ // otherwise, allow the inner subscriber or collector to weigh in.
+ inner
+ }
+
+ fn pick_level_hint(
+ &self,
+ outer_hint: Option<LevelFilter>,
+ inner_hint: Option<LevelFilter>,
+ ) -> Option<LevelFilter> {
+ if self.inner_is_registry {
+ return outer_hint;
+ }
+
+ if self.has_layer_filter && self.inner_has_layer_filter {
+ return Some(cmp::max(outer_hint?, inner_hint?));
+ }
+
+ if self.has_layer_filter && inner_hint.is_none() {
+ return None;
+ }
+
+ if self.inner_has_layer_filter && outer_hint.is_none() {
+ return None;
+ }
+
+ cmp::max(outer_hint, inner_hint)
+ }
+}
+
+impl<A, B, S> fmt::Debug for Layered<A, B, S>
+where
+ A: fmt::Debug,
+ B: fmt::Debug,
+{
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ #[cfg(all(feature = "registry", feature = "std"))]
+ let alt = f.alternate();
+ let mut s = f.debug_struct("Layered");
+ // These additional fields are more verbose and usually only necessary
+ // for internal debugging purposes, so only print them if alternate mode
+ // is enabled.
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ {
+ if alt {
+ s.field("inner_is_registry", &self.inner_is_registry)
+ .field("has_layer_filter", &self.has_layer_filter)
+ .field("inner_has_layer_filter", &self.inner_has_layer_filter);
+ }
+ }
+
+ s.field("layer", &self.layer)
+ .field("inner", &self.inner)
+ .finish()
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/layer/mod.rs b/vendor/tracing-subscriber-0.3.3/src/layer/mod.rs
new file mode 100644
index 000000000..f3f994490
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/layer/mod.rs
@@ -0,0 +1,1285 @@
+//! The [`Layer`] trait, a composable abstraction for building [`Subscriber`]s.
+//!
+//! The [`Subscriber`] trait in `tracing-core` represents the _complete_ set of
+//! functionality required to consume `tracing` instrumentation. This means that
+//! a single `Subscriber` instance is a self-contained implementation of a
+//! complete strategy for collecting traces; but it _also_ means that the
+//! `Subscriber` trait cannot easily be composed with other `Subscriber`s.
+//!
+//! In particular, [`Subscriber`]s are responsible for generating [span IDs] and
+//! assigning them to spans. Since these IDs must uniquely identify a span
+//! within the context of the current trace, this means that there may only be
+//! a single `Subscriber` for a given thread at any point in time &mdash;
+//! otherwise, there would be no authoritative source of span IDs.
+//!
+//! On the other hand, the majority of the [`Subscriber`] trait's functionality
+//! is composable: any number of subscribers may _observe_ events, span entry
+//! and exit, and so on, provided that there is a single authoritative source of
+//! span IDs. The [`Layer`] trait represents this composable subset of the
+//! [`Subscriber`] behavior; it can _observe_ events and spans, but does not
+//! assign IDs.
+//!
+//! ## Composing Layers
+//!
+//! Since a [`Layer`] does not implement a complete strategy for collecting
+//! traces, it must be composed with a `Subscriber` in order to be used. The
+//! [`Layer`] trait is generic over a type parameter (called `S` in the trait
+//! definition), representing the types of `Subscriber` they can be composed
+//! with. Thus, a [`Layer`] may be implemented that will only compose with a
+//! particular `Subscriber` implementation, or additional trait bounds may be
+//! added to constrain what types implementing `Subscriber` a `Layer` can wrap.
+//!
+//! `Layer`s may be added to a `Subscriber` by using the [`SubscriberExt::with`]
+//! method, which is provided by `tracing-subscriber`'s [prelude]. This method
+//! returns a [`Layered`] struct that implements `Subscriber` by composing the
+//! `Layer` with the `Subscriber`.
+//!
+//! For example:
+//! ```rust
+//! use tracing_subscriber::Layer;
+//! use tracing_subscriber::prelude::*;
+//! use tracing::Subscriber;
+//!
+//! pub struct MyLayer {
+//! // ...
+//! }
+//!
+//! impl<S: Subscriber> Layer<S> for MyLayer {
+//! // ...
+//! }
+//!
+//! pub struct MySubscriber {
+//! // ...
+//! }
+//!
+//! # use tracing_core::{span::{Id, Attributes, Record}, Metadata, Event};
+//! impl Subscriber for MySubscriber {
+//! // ...
+//! # fn new_span(&self, _: &Attributes) -> Id { Id::from_u64(1) }
+//! # fn record(&self, _: &Id, _: &Record) {}
+//! # fn event(&self, _: &Event) {}
+//! # fn record_follows_from(&self, _: &Id, _: &Id) {}
+//! # fn enabled(&self, _: &Metadata) -> bool { false }
+//! # fn enter(&self, _: &Id) {}
+//! # fn exit(&self, _: &Id) {}
+//! }
+//! # impl MyLayer {
+//! # fn new() -> Self { Self {} }
+//! # }
+//! # impl MySubscriber {
+//! # fn new() -> Self { Self { }}
+//! # }
+//!
+//! let subscriber = MySubscriber::new()
+//! .with(MyLayer::new());
+//!
+//! tracing::subscriber::set_global_default(subscriber);
+//! ```
+//!
+//! Multiple `Layer`s may be composed in the same manner:
+//! ```rust
+//! # use tracing_subscriber::{Layer, layer::SubscriberExt};
+//! # use tracing::Subscriber;
+//! pub struct MyOtherLayer {
+//! // ...
+//! }
+//!
+//! impl<S: Subscriber> Layer<S> for MyOtherLayer {
+//! // ...
+//! }
+//!
+//! pub struct MyThirdLayer {
+//! // ...
+//! }
+//!
+//! impl<S: Subscriber> Layer<S> for MyThirdLayer {
+//! // ...
+//! }
+//! # pub struct MyLayer {}
+//! # impl<S: Subscriber> Layer<S> for MyLayer {}
+//! # pub struct MySubscriber { }
+//! # use tracing_core::{span::{Id, Attributes, Record}, Metadata, Event};
+//! # impl Subscriber for MySubscriber {
+//! # fn new_span(&self, _: &Attributes) -> Id { Id::from_u64(1) }
+//! # fn record(&self, _: &Id, _: &Record) {}
+//! # fn event(&self, _: &Event) {}
+//! # fn record_follows_from(&self, _: &Id, _: &Id) {}
+//! # fn enabled(&self, _: &Metadata) -> bool { false }
+//! # fn enter(&self, _: &Id) {}
+//! # fn exit(&self, _: &Id) {}
+//! }
+//! # impl MyLayer {
+//! # fn new() -> Self { Self {} }
+//! # }
+//! # impl MyOtherLayer {
+//! # fn new() -> Self { Self {} }
+//! # }
+//! # impl MyThirdLayer {
+//! # fn new() -> Self { Self {} }
+//! # }
+//! # impl MySubscriber {
+//! # fn new() -> Self { Self { }}
+//! # }
+//!
+//! let subscriber = MySubscriber::new()
+//! .with(MyLayer::new())
+//! .with(MyOtherLayer::new())
+//! .with(MyThirdLayer::new());
+//!
+//! tracing::subscriber::set_global_default(subscriber);
+//! ```
+//!
+//! The [`Layer::with_subscriber`] constructs the [`Layered`] type from a
+//! [`Layer`] and [`Subscriber`], and is called by [`SubscriberExt::with`]. In
+//! general, it is more idiomatic to use [`SubscriberExt::with`], and treat
+//! [`Layer::with_subscriber`] as an implementation detail, as `with_subscriber`
+//! calls must be nested, leading to less clear code for the reader.
+//!
+//! [prelude]: crate::prelude
+//!
+//! ## Recording Traces
+//!
+//! The [`Layer`] trait defines a set of methods for consuming notifications from
+//! tracing instrumentation, which are generally equivalent to the similarly
+//! named methods on [`Subscriber`]. Unlike [`Subscriber`], the methods on
+//! `Layer` are additionally passed a [`Context`] type, which exposes additional
+//! information provided by the wrapped subscriber (such as [the current span])
+//! to the layer.
+//!
+//! ## Filtering with `Layer`s
+//!
+//! As well as strategies for handling trace events, the `Layer` trait may also
+//! be used to represent composable _filters_. This allows the determination of
+//! what spans and events should be recorded to be decoupled from _how_ they are
+//! recorded: a filtering layer can be applied to other layers or
+//! subscribers. `Layer`s can be used to implement _global filtering_, where a
+//! `Layer` provides a filtering strategy for the entire subscriber.
+//! Additionally, individual recording `Layer`s or sets of `Layer`s may be
+//! combined with _per-layer filters_ that control what spans and events are
+//! recorded by those layers.
+//!
+//! ### Global Filtering
+//!
+//! A `Layer` that implements a filtering strategy should override the
+//! [`register_callsite`] and/or [`enabled`] methods. It may also choose to implement
+//! methods such as [`on_enter`], if it wishes to filter trace events based on
+//! the current span context.
+//!
+//! Note that the [`Layer::register_callsite`] and [`Layer::enabled`] methods
+//! determine whether a span or event is enabled *globally*. Thus, they should
+//! **not** be used to indicate whether an individual layer wishes to record a
+//! particular span or event. Instead, if a layer is only interested in a subset
+//! of trace data, but does *not* wish to disable other spans and events for the
+//! rest of the layer stack should ignore those spans and events in its
+//! notification methods.
+//!
+//! The filtering methods on a stack of `Layer`s are evaluated in a top-down
+//! order, starting with the outermost `Layer` and ending with the wrapped
+//! [`Subscriber`]. If any layer returns `false` from its [`enabled`] method, or
+//! [`Interest::never()`] from its [`register_callsite`] method, filter
+//! evaluation will short-circuit and the span or event will be disabled.
+//!
+//! ### Per-Layer Filtering
+//!
+//! **Note**: per-layer filtering APIs currently require the [`"registry"` crate
+//! feature flag][feat] to be enabled.
+//!
+//! Sometimes, it may be desirable for one `Layer` to record a particular subset
+//! of spans and events, while a different subset of spans and events are
+//! recorded by other `Layer`s. For example:
+//!
+//! - A layer that records metrics may wish to observe only events including
+//! particular tracked values, while a logging layer ignores those events.
+//! - If recording a distributed trace is expensive, it might be desirable to
+//! only send spans with `INFO` and lower verbosity to the distributed tracing
+//! system, while logging more verbose spans to a file.
+//! - Spans and events with a particular target might be recorded differently
+//! from others, such as by generating an HTTP access log from a span that
+//! tracks the lifetime of an HTTP request.
+//!
+//! The [`Filter`] trait is used to control what spans and events are
+//! observed by an individual `Layer`, while still allowing other `Layer`s to
+//! potentially record them. The [`Layer::with_filter`] method combines a
+//! `Layer` with a [`Filter`], returning a [`Filtered`] layer.
+//!
+//! This crate's [`filter`] module provides a number of types which implement
+//! the [`Filter`] trait, such as [`LevelFilter`], [`Targets`], and
+//! [`FilterFn`]. These [`Filter`]s provide ready-made implementations of
+//! common forms of filtering. For custom filtering policies, the [`FilterFn`]
+//! and [`DynFilterFn`] types allow implementing a [`Filter`] with a closure or
+//! function pointer. In addition, when more control is required, the [`Filter`]
+//! trait may also be implemented for user-defined types.
+//!
+//! <pre class="compile_fail" style="white-space:normal;font:inherit;">
+//! <strong>Warning</strong>: Currently, the <a href="../struct.Registry.html">
+//! <code>Registry</code></a> type defined in this crate is the only root
+//! <code>Subscriber</code> capable of supporting <code>Layer</code>s with
+//! per-layer filters. In the future, new APIs will be added to allow other
+//! root <code>Subscriber</code>s to support per-layer filters.
+//! </pre>
+//!
+//! For example, to generate an HTTP access log based on spans with
+//! the `http_access` target, while logging other spans and events to
+//! standard out, a [`Filter`] can be added to the access log layer:
+//!
+//! ```
+//! use tracing_subscriber::{filter, prelude::*};
+//!
+//! // Generates an HTTP access log.
+//! let access_log = // ...
+//! # filter::LevelFilter::INFO;
+//!
+//! // Add a filter to the access log layer so that it only observes
+//! // spans and events with the `http_access` target.
+//! let access_log = access_log.with_filter(filter::filter_fn(|metadata| {
+//! // Returns `true` if and only if the span or event's target is
+//! // "http_access".
+//! metadata.target() == "http_access"
+//! }));
+//!
+//! // A general-purpose logging layer.
+//! let fmt_layer = tracing_subscriber::fmt::layer();
+//!
+//! // Build a subscriber that combines the access log and stdout log
+//! // layers.
+//! tracing_subscriber::registry()
+//! .with(fmt_layer)
+//! .with(access_log)
+//! .init();
+//! ```
+//!
+//! Multiple layers can have their own, separate per-layer filters. A span or
+//! event will be recorded if it is enabled by _any_ per-layer filter, but it
+//! will be skipped by the layers whose filters did not enable it. Building on
+//! the previous example:
+//!
+//! ```
+//! use tracing_subscriber::{filter::{filter_fn, LevelFilter}, prelude::*};
+//!
+//! let access_log = // ...
+//! # LevelFilter::INFO;
+//! let fmt_layer = tracing_subscriber::fmt::layer();
+//!
+//! tracing_subscriber::registry()
+//! // Add the filter for the "http_access" target to the access
+//! // log layer, like before.
+//! .with(access_log.with_filter(filter_fn(|metadata| {
+//! metadata.target() == "http_access"
+//! })))
+//! // Add a filter for spans and events with the INFO level
+//! // and below to the logging layer.
+//! .with(fmt_layer.with_filter(LevelFilter::INFO))
+//! .init();
+//!
+//! // Neither layer will observe this event
+//! tracing::debug!(does_anyone_care = false, "a tree fell in the forest");
+//!
+//! // This event will be observed by the logging layer, but not
+//! // by the access log layer.
+//! tracing::warn!(dose_roentgen = %3.8, "not great, but not terrible");
+//!
+//! // This event will be observed only by the access log layer.
+//! tracing::trace!(target: "http_access", "HTTP request started");
+//!
+//! // Both layers will observe this event.
+//! tracing::error!(target: "http_access", "HTTP request failed with a very bad error!");
+//! ```
+//!
+//! A per-layer filter can be applied to multiple [`Layer`]s at a time, by
+//! combining them into a [`Layered`] layer using [`Layer::and_then`], and then
+//! calling [`Layer::with_filter`] on the resulting [`Layered`] layer.
+//!
+//! Consider the following:
+//! - `layer_a` and `layer_b`, which should only receive spans and events at
+//! the [`INFO`] [level] and above.
+//! - A third layer, `layer_c`, which should receive spans and events at
+//! the [`DEBUG`] [level] as well.
+//! The layers and filters would be composed thusly:
+//!
+//! ```
+//! use tracing_subscriber::{filter::LevelFilter, prelude::*};
+//!
+//! let layer_a = // ...
+//! # LevelFilter::INFO;
+//! let layer_b = // ...
+//! # LevelFilter::INFO;
+//! let layer_c = // ...
+//! # LevelFilter::INFO;
+//!
+//! let info_layers = layer_a
+//! // Combine `layer_a` and `layer_b` into a `Layered` layer:
+//! .and_then(layer_b)
+//! // ...and then add an `INFO` `LevelFilter` to that layer:
+//! .with_filter(LevelFilter::INFO);
+//!
+//! tracing_subscriber::registry()
+//! // Add `layer_c` with a `DEBUG` filter.
+//! .with(layer_c.with_filter(LevelFilter::DEBUG))
+//! .with(info_layers)
+//! .init();
+//!```
+//!
+//! If a [`Filtered`] [`Layer`] is combined with another [`Layer`]
+//! [`Layer::and_then`], and a filter is added to the [`Layered`] layer, that
+//! layer will be filtered by *both* the inner filter and the outer filter.
+//! Only spans and events that are enabled by *both* filters will be
+//! observed by that layer. This can be used to implement complex filtering
+//! trees.
+//!
+//! As an example, consider the following constraints:
+//! - Suppose that a particular [target] is used to indicate events that
+//! should be counted as part of a metrics system, which should be only
+//! observed by a layer that collects metrics.
+//! - A log of high-priority events ([`INFO`] and above) should be logged
+//! to stdout, while more verbose events should be logged to a debugging log file.
+//! - Metrics-focused events should *not* be included in either log output.
+//!
+//! In that case, it is possible to apply a filter to both logging layers to
+//! exclude the metrics events, while additionally adding a [`LevelFilter`]
+//! to the stdout log:
+//!
+//! ```
+//! # // wrap this in a function so we don't actually create `debug.log` when
+//! # // running the doctests..
+//! # fn docs() -> Result<(), Box<dyn std::error::Error + 'static>> {
+//! use tracing_subscriber::{filter, prelude::*};
+//! use std::{fs::File, sync::Arc};
+//!
+//! // A layer that logs events to stdout using the human-readable "pretty"
+//! // format.
+//! let stdout_log = tracing_subscriber::fmt::layer()
+//! .pretty();
+//!
+//! // A layer that logs events to a file.
+//! let file = File::create("debug.log")?;
+//! let debug_log = tracing_subscriber::fmt::layer()
+//! .with_writer(Arc::new(file));
+//!
+//! // A layer that collects metrics using specific events.
+//! let metrics_layer = /* ... */ filter::LevelFilter::INFO;
+//!
+//! tracing_subscriber::registry()
+//! .with(
+//! stdout_log
+//! // Add an `INFO` filter to the stdout logging layer
+//! .with_filter(filter::LevelFilter::INFO)
+//! // Combine the filtered `stdout_log` layer with the
+//! // `debug_log` layer, producing a new `Layered` layer.
+//! .and_then(debug_log)
+//! // Add a filter to *both* layers that rejects spans and
+//! // events whose targets start with `metrics`.
+//! .with_filter(filter::filter_fn(|metadata| {
+//! !metadata.target().starts_with("metrics")
+//! }))
+//! )
+//! .with(
+//! // Add a filter to the metrics label that *only* enables
+//! // events whose targets start with `metrics`.
+//! metrics_layer.with_filter(filter::filter_fn(|metadata| {
+//! metadata.target().starts_with("metrics")
+//! }))
+//! )
+//! .init();
+//!
+//! // This event will *only* be recorded by the metrics layer.
+//! tracing::info!(target: "metrics::cool_stuff_count", value = 42);
+//!
+//! // This event will only be seen by the debug log file layer:
+//! tracing::debug!("this is a message, and part of a system of messages");
+//!
+//! // This event will be seen by both the stdout log layer *and*
+//! // the debug log file layer, but not by the metrics layer.
+//! tracing::warn!("the message is a warning about danger!");
+//! # Ok(()) }
+//! ```
+//!
+//! ## Runtime Configuration With Layers
+//!
+//! In some cases, a particular [`Layer`] may be enabled or disabled based on
+//! runtime configuration. This can introduce challenges, because the type of a
+//! layered [`Subscriber`] depends on which layers are added to it: if an `if`
+//! or `match` expression adds some [`Layer`]s in one branch and other layers
+//! in another, the [`Subscriber`] values returned by those branches will have
+//! different types. For example, the following _will not_ work:
+//!
+//! ```compile_fail
+//! # fn docs() -> Result<(), Box<dyn std::error::Error + 'static>> {
+//! # struct Config {
+//! # is_prod: bool,
+//! # path: &'static str,
+//! # }
+//! # let cfg = Config { is_prod: false, path: "debug.log" };
+//! use std::{fs::File, sync::Arc};
+//! use tracing_subscriber::{Registry, prelude::*};
+//!
+//! let stdout_log = tracing_subscriber::fmt::layer().pretty();
+//! let subscriber = Registry::default().with(stdout_log);
+//!
+//! // The compile error will occur here because the if and else
+//! // branches have different (and therefore incompatible) types.
+//! let subscriber = if cfg.is_prod {
+//! let file = File::create(cfg.path)?;
+//! let layer = tracing_subscriber::fmt::layer()
+//! .json()
+//! .with_writer(Arc::new(file));
+//! subscriber.with(layer)
+//! } else {
+//! subscriber
+//! };
+//!
+//! tracing::subscriber::set_global_default(subscriber)
+//! .expect("Unable to set global subscriber");
+//! # Ok(()) }
+//! ```
+//!
+//! However, a [`Layer`] wrapped in an [`Option`] [also implements the `Layer`
+//! trait][option-impl]. This allows individual layers to be enabled or disabled at
+//! runtime while always producing a [`Subscriber`] of the same type. For
+//! example:
+//!
+//! ```
+//! # fn docs() -> Result<(), Box<dyn std::error::Error + 'static>> {
+//! # struct Config {
+//! # is_prod: bool,
+//! # path: &'static str,
+//! # }
+//! # let cfg = Config { is_prod: false, path: "debug.log" };
+//! use std::{fs::File, sync::Arc};
+//! use tracing_subscriber::{Registry, prelude::*};
+//!
+//! let stdout_log = tracing_subscriber::fmt::layer().pretty();
+//! let subscriber = Registry::default().with(stdout_log);
+//!
+//! // if `cfg.is_prod` is true, also log JSON-formatted logs to a file.
+//! let json_log = if cfg.is_prod {
+//! let file = File::create(cfg.path)?;
+//! let json_log = tracing_subscriber::fmt::layer()
+//! .json()
+//! .with_writer(Arc::new(file));
+//! Some(json_log)
+//! } else {
+//! None
+//! };
+//!
+//! // If `cfg.is_prod` is false, then `json` will be `None`, and this layer
+//! // will do nothing. However, the subscriber will still have the same type
+//! // regardless of whether the `Option`'s value is `None` or `Some`.
+//! let subscriber = subscriber.with(json_log);
+//!
+//! tracing::subscriber::set_global_default(subscriber)
+//! .expect("Unable to set global subscriber");
+//! # Ok(()) }
+//! ```
+//!
+//! [`Subscriber`]: https://docs.rs/tracing-core/latest/tracing_core/subscriber/trait.Subscriber.html
+//! [span IDs]: https://docs.rs/tracing-core/latest/tracing_core/span/struct.Id.html
+//! [the current span]: Context::current_span
+//! [`register_callsite`]: Layer::register_callsite
+//! [`enabled`]: Layer::enabled
+//! [`on_enter`]: Layer::on_enter
+//! [`Layer::register_callsite`]: Layer::register_callsite
+//! [`Layer::enabled`]: Layer::enabled
+//! [`Interest::never()`]: https://docs.rs/tracing-core/latest/tracing_core/subscriber/struct.Interest.html#method.never
+//! [option-impl]: crate::layer::Layer#impl-Layer<S>-for-Option<L>
+//! [`Filtered`]: crate::filter::Filtered
+//! [`filter`]: crate::filter
+//! [`Targets`]: crate::filter::Targets
+//! [`FilterFn`]: crate::filter::FilterFn
+//! [`DynFilterFn`]: crate::filter::DynFilterFn
+//! [level]: tracing_core::Level
+//! [`INFO`]: tracing_core::Level::INFO
+//! [`DEBUG`]: tracing_core::Level::DEBUG
+//! [target]: tracing_core::Metadata::target
+//! [`LevelFilter`]: crate::filter::LevelFilter
+//! [feat]: crate#feature-flags
+use crate::filter;
+
+use tracing_core::{
+ metadata::Metadata,
+ span,
+ subscriber::{Interest, Subscriber},
+ Event, LevelFilter,
+};
+
+use core::any::TypeId;
+
+feature! {
+ #![feature = "alloc"]
+ use alloc::boxed::Box;
+ use core::ops::{Deref, DerefMut};
+}
+
+mod context;
+mod layered;
+pub use self::{context::*, layered::*};
+
+// The `tests` module is `pub(crate)` because it contains test utilities used by
+// other modules.
+#[cfg(test)]
+pub(crate) mod tests;
+
+/// A composable handler for `tracing` events.
+///
+/// A `Layer` implements a behavior for recording or collecting traces that can
+/// be composed together with other `Layer`s to build a [`Subscriber`]. See the
+/// [module-level documentation](crate::layer) for details.
+///
+/// [`Subscriber`]: tracing_core::Subscriber
+#[cfg_attr(docsrs, doc(notable_trait))]
+pub trait Layer<S>
+where
+ S: Subscriber,
+ Self: 'static,
+{
+ /// Performs late initialization when attaching a `Layer` to a
+ /// [`Subscriber`].
+ ///
+ /// This is a callback that is called when the `Layer` is added to a
+ /// [`Subscriber`] (e.g. in [`Layer::with_subscriber`] and
+ /// [`SubscriberExt::with`]). Since this can only occur before the
+ /// [`Subscriber`] has been set as the default, both the `Layer` and
+ /// [`Subscriber`] are passed to this method _mutably_. This gives the
+ /// `Layer` the opportunity to set any of its own fields with values
+ /// recieved by method calls on the [`Subscriber`].
+ ///
+ /// For example, [`Filtered`] layers implement `on_layer` to call the
+ /// [`Subscriber`]'s [`register_filter`] method, and store the returned
+ /// [`FilterId`] as a field.
+ ///
+ /// **Note** In most cases, `Layer` implementations will not need to
+ /// implement this method. However, in cases where a type implementing
+ /// `Layer` wraps one or more other types that implement `Layer`, like the
+ /// [`Layered`] and [`Filtered`] types in this crate, that type MUST ensure
+ /// that the inner `Layer`s' `on_layer` methods are called. Otherwise,
+ /// functionality that relies on `on_layer`, such as [per-layer filtering],
+ /// may not work correctly.
+ ///
+ /// [`Filtered`]: crate::filter::Filtered
+ /// [`register_filter`]: crate::registry::LookupSpan::register_filter
+ /// [per-layer filtering]: #per-layer-filtering
+ /// [`FilterId`]: crate::filter::FilterId
+ fn on_layer(&mut self, subscriber: &mut S) {
+ let _ = subscriber;
+ }
+
+ /// Registers a new callsite with this layer, returning whether or not
+ /// the layer is interested in being notified about the callsite, similarly
+ /// to [`Subscriber::register_callsite`].
+ ///
+ /// By default, this returns [`Interest::always()`] if [`self.enabled`] returns
+ /// true, or [`Interest::never()`] if it returns false.
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: This method (and <a href="#method.enabled">
+ /// <code>Layer::enabled</code></a>) determine whether a span or event is
+ /// globally enabled, <em>not</em> whether the individual layer will be
+ /// notified about that span or event. This is intended to be used
+ /// by layers that implement filtering for the entire stack. Layers which do
+ /// not wish to be notified about certain spans or events but do not wish to
+ /// globally disable them should ignore those spans or events in their
+ /// <a href="#method.on_event"><code>on_event</code></a>,
+ /// <a href="#method.on_enter"><code>on_enter</code></a>,
+ /// <a href="#method.on_exit"><code>on_exit</code></a>, and other notification
+ /// methods.
+ /// </pre>
+ ///
+ /// See [the trait-level documentation] for more information on filtering
+ /// with `Layer`s.
+ ///
+ /// Layers may also implement this method to perform any behaviour that
+ /// should be run once per callsite. If the layer wishes to use
+ /// `register_callsite` for per-callsite behaviour, but does not want to
+ /// globally enable or disable those callsites, it should always return
+ /// [`Interest::always()`].
+ ///
+ /// [`Interest`]: https://docs.rs/tracing-core/latest/tracing_core/struct.Interest.html
+ /// [`Subscriber::register_callsite`]: https://docs.rs/tracing-core/latest/tracing_core/trait.Subscriber.html#method.register_callsite
+ /// [`Interest::never()`]: https://docs.rs/tracing-core/latest/tracing_core/subscriber/struct.Interest.html#method.never
+ /// [`Interest::always()`]: https://docs.rs/tracing-core/latest/tracing_core/subscriber/struct.Interest.html#method.always
+ /// [`self.enabled`]: #method.enabled
+ /// [`Layer::enabled`]: #method.enabled
+ /// [`on_event`]: #method.on_event
+ /// [`on_enter`]: #method.on_enter
+ /// [`on_exit`]: #method.on_exit
+ /// [the trait-level documentation]: #filtering-with-layers
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ if self.enabled(metadata, Context::none()) {
+ Interest::always()
+ } else {
+ Interest::never()
+ }
+ }
+
+ /// Returns `true` if this layer is interested in a span or event with the
+ /// given `metadata` in the current [`Context`], similarly to
+ /// [`Subscriber::enabled`].
+ ///
+ /// By default, this always returns `true`, allowing the wrapped subscriber
+ /// to choose to disable the span.
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: This method (and <a href="#method.register_callsite">
+ /// <code>Layer::register_callsite</code></a>) determine whether a span or event is
+ /// globally enabled, <em>not</em> whether the individual layer will be
+ /// notified about that span or event. This is intended to be used
+ /// by layers that implement filtering for the entire stack. Layers which do
+ /// not wish to be notified about certain spans or events but do not wish to
+ /// globally disable them should ignore those spans or events in their
+ /// <a href="#method.on_event"><code>on_event</code></a>,
+ /// <a href="#method.on_enter"><code>on_enter</code></a>,
+ /// <a href="#method.on_exit"><code>on_exit</code></a>, and other notification
+ /// methods.
+ /// </pre>
+ ///
+ ///
+ /// See [the trait-level documentation] for more information on filtering
+ /// with `Layer`s.
+ ///
+ /// [`Interest`]: https://docs.rs/tracing-core/latest/tracing_core/struct.Interest.html
+ /// [`Context`]: ../struct.Context.html
+ /// [`Subscriber::enabled`]: https://docs.rs/tracing-core/latest/tracing_core/trait.Subscriber.html#method.enabled
+ /// [`Layer::register_callsite`]: #method.register_callsite
+ /// [`on_event`]: #method.on_event
+ /// [`on_enter`]: #method.on_enter
+ /// [`on_exit`]: #method.on_exit
+ /// [the trait-level documentation]: #filtering-with-layers
+ fn enabled(&self, metadata: &Metadata<'_>, ctx: Context<'_, S>) -> bool {
+ let _ = (metadata, ctx);
+ true
+ }
+
+ /// Notifies this layer that a new span was constructed with the given
+ /// `Attributes` and `Id`.
+ fn on_new_span(&self, attrs: &span::Attributes<'_>, id: &span::Id, ctx: Context<'_, S>) {
+ let _ = (attrs, id, ctx);
+ }
+
+ // TODO(eliza): do we want this to be a public API? If we end up moving
+ // filtering layers to a separate trait, we may no longer want `Layer`s to
+ // be able to participate in max level hinting...
+ #[doc(hidden)]
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ None
+ }
+
+ /// Notifies this layer that a span with the given `Id` recorded the given
+ /// `values`.
+ // Note: it's unclear to me why we'd need the current span in `record` (the
+ // only thing the `Context` type currently provides), but passing it in anyway
+ // seems like a good future-proofing measure as it may grow other methods later...
+ fn on_record(&self, _span: &span::Id, _values: &span::Record<'_>, _ctx: Context<'_, S>) {}
+
+ /// Notifies this layer that a span with the ID `span` recorded that it
+ /// follows from the span with the ID `follows`.
+ // Note: it's unclear to me why we'd need the current span in `record` (the
+ // only thing the `Context` type currently provides), but passing it in anyway
+ // seems like a good future-proofing measure as it may grow other methods later...
+ fn on_follows_from(&self, _span: &span::Id, _follows: &span::Id, _ctx: Context<'_, S>) {}
+
+ /// Notifies this layer that an event has occurred.
+ fn on_event(&self, _event: &Event<'_>, _ctx: Context<'_, S>) {}
+
+ /// Notifies this layer that a span with the given ID was entered.
+ fn on_enter(&self, _id: &span::Id, _ctx: Context<'_, S>) {}
+
+ /// Notifies this layer that the span with the given ID was exited.
+ fn on_exit(&self, _id: &span::Id, _ctx: Context<'_, S>) {}
+
+ /// Notifies this layer that the span with the given ID has been closed.
+ fn on_close(&self, _id: span::Id, _ctx: Context<'_, S>) {}
+
+ /// Notifies this layer that a span ID has been cloned, and that the
+ /// subscriber returned a different ID.
+ fn on_id_change(&self, _old: &span::Id, _new: &span::Id, _ctx: Context<'_, S>) {}
+
+ /// Composes this layer around the given `Layer`, returning a `Layered`
+ /// struct implementing `Layer`.
+ ///
+ /// The returned `Layer` will call the methods on this `Layer` and then
+ /// those of the new `Layer`, before calling the methods on the subscriber
+ /// it wraps. For example:
+ ///
+ /// ```rust
+ /// # use tracing_subscriber::layer::Layer;
+ /// # use tracing_core::Subscriber;
+ /// pub struct FooLayer {
+ /// // ...
+ /// }
+ ///
+ /// pub struct BarLayer {
+ /// // ...
+ /// }
+ ///
+ /// pub struct MySubscriber {
+ /// // ...
+ /// }
+ ///
+ /// impl<S: Subscriber> Layer<S> for FooLayer {
+ /// // ...
+ /// }
+ ///
+ /// impl<S: Subscriber> Layer<S> for BarLayer {
+ /// // ...
+ /// }
+ ///
+ /// # impl FooLayer {
+ /// # fn new() -> Self { Self {} }
+ /// # }
+ /// # impl BarLayer {
+ /// # fn new() -> Self { Self { }}
+ /// # }
+ /// # impl MySubscriber {
+ /// # fn new() -> Self { Self { }}
+ /// # }
+ /// # use tracing_core::{span::{Id, Attributes, Record}, Metadata, Event};
+ /// # impl tracing_core::Subscriber for MySubscriber {
+ /// # fn new_span(&self, _: &Attributes) -> Id { Id::from_u64(1) }
+ /// # fn record(&self, _: &Id, _: &Record) {}
+ /// # fn event(&self, _: &Event) {}
+ /// # fn record_follows_from(&self, _: &Id, _: &Id) {}
+ /// # fn enabled(&self, _: &Metadata) -> bool { false }
+ /// # fn enter(&self, _: &Id) {}
+ /// # fn exit(&self, _: &Id) {}
+ /// # }
+ /// let subscriber = FooLayer::new()
+ /// .and_then(BarLayer::new())
+ /// .with_subscriber(MySubscriber::new());
+ /// ```
+ ///
+ /// Multiple layers may be composed in this manner:
+ ///
+ /// ```rust
+ /// # use tracing_subscriber::layer::Layer;
+ /// # use tracing_core::Subscriber;
+ /// # pub struct FooLayer {}
+ /// # pub struct BarLayer {}
+ /// # pub struct MySubscriber {}
+ /// # impl<S: Subscriber> Layer<S> for FooLayer {}
+ /// # impl<S: Subscriber> Layer<S> for BarLayer {}
+ /// # impl FooLayer {
+ /// # fn new() -> Self { Self {} }
+ /// # }
+ /// # impl BarLayer {
+ /// # fn new() -> Self { Self { }}
+ /// # }
+ /// # impl MySubscriber {
+ /// # fn new() -> Self { Self { }}
+ /// # }
+ /// # use tracing_core::{span::{Id, Attributes, Record}, Metadata, Event};
+ /// # impl tracing_core::Subscriber for MySubscriber {
+ /// # fn new_span(&self, _: &Attributes) -> Id { Id::from_u64(1) }
+ /// # fn record(&self, _: &Id, _: &Record) {}
+ /// # fn event(&self, _: &Event) {}
+ /// # fn record_follows_from(&self, _: &Id, _: &Id) {}
+ /// # fn enabled(&self, _: &Metadata) -> bool { false }
+ /// # fn enter(&self, _: &Id) {}
+ /// # fn exit(&self, _: &Id) {}
+ /// # }
+ /// pub struct BazLayer {
+ /// // ...
+ /// }
+ ///
+ /// impl<S: Subscriber> Layer<S> for BazLayer {
+ /// // ...
+ /// }
+ /// # impl BazLayer { fn new() -> Self { BazLayer {} } }
+ ///
+ /// let subscriber = FooLayer::new()
+ /// .and_then(BarLayer::new())
+ /// .and_then(BazLayer::new())
+ /// .with_subscriber(MySubscriber::new());
+ /// ```
+ fn and_then<L>(self, layer: L) -> Layered<L, Self, S>
+ where
+ L: Layer<S>,
+ Self: Sized,
+ {
+ let inner_has_layer_filter = filter::layer_has_plf(&self);
+ Layered::new(layer, self, inner_has_layer_filter)
+ }
+
+ /// Composes this `Layer` with the given [`Subscriber`], returning a
+ /// `Layered` struct that implements [`Subscriber`].
+ ///
+ /// The returned `Layered` subscriber will call the methods on this `Layer`
+ /// and then those of the wrapped subscriber.
+ ///
+ /// For example:
+ /// ```rust
+ /// # use tracing_subscriber::layer::Layer;
+ /// # use tracing_core::Subscriber;
+ /// pub struct FooLayer {
+ /// // ...
+ /// }
+ ///
+ /// pub struct MySubscriber {
+ /// // ...
+ /// }
+ ///
+ /// impl<S: Subscriber> Layer<S> for FooLayer {
+ /// // ...
+ /// }
+ ///
+ /// # impl FooLayer {
+ /// # fn new() -> Self { Self {} }
+ /// # }
+ /// # impl MySubscriber {
+ /// # fn new() -> Self { Self { }}
+ /// # }
+ /// # use tracing_core::{span::{Id, Attributes, Record}, Metadata};
+ /// # impl tracing_core::Subscriber for MySubscriber {
+ /// # fn new_span(&self, _: &Attributes) -> Id { Id::from_u64(0) }
+ /// # fn record(&self, _: &Id, _: &Record) {}
+ /// # fn event(&self, _: &tracing_core::Event) {}
+ /// # fn record_follows_from(&self, _: &Id, _: &Id) {}
+ /// # fn enabled(&self, _: &Metadata) -> bool { false }
+ /// # fn enter(&self, _: &Id) {}
+ /// # fn exit(&self, _: &Id) {}
+ /// # }
+ /// let subscriber = FooLayer::new()
+ /// .with_subscriber(MySubscriber::new());
+ ///```
+ ///
+ /// [`Subscriber`]: https://docs.rs/tracing-core/latest/tracing_core/trait.Subscriber.html
+ fn with_subscriber(mut self, mut inner: S) -> Layered<Self, S>
+ where
+ Self: Sized,
+ {
+ let inner_has_layer_filter = filter::subscriber_has_plf(&inner);
+ self.on_layer(&mut inner);
+ Layered::new(self, inner, inner_has_layer_filter)
+ }
+
+ /// Combines `self` with a [`Filter`], returning a [`Filtered`] layer.
+ ///
+ /// The [`Filter`] will control which spans and events are enabled for
+ /// this layer. See [the trait-level documentation][plf] for details on
+ /// per-layer filtering.
+ ///
+ /// [`Filtered`]: crate::filter::Filtered
+ /// [plf]: #per-layer-filtering
+ #[cfg(all(feature = "registry", feature = "std"))]
+ #[cfg_attr(docsrs, doc(cfg(all(feature = "registry", feature = "std"))))]
+ fn with_filter<F>(self, filter: F) -> filter::Filtered<Self, F, S>
+ where
+ Self: Sized,
+ F: Filter<S>,
+ {
+ filter::Filtered::new(self, filter)
+ }
+
+ #[doc(hidden)]
+ unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()> {
+ if id == TypeId::of::<Self>() {
+ Some(self as *const _ as *const ())
+ } else {
+ None
+ }
+ }
+}
+
+feature! {
+ #![all(feature = "registry", feature = "std")]
+ /// A per-[`Layer`] filter that determines whether a span or event is enabled
+ /// for an individual layer.
+ ///
+ /// See [the module-level documentation][plf] for details on using [`Filter`]s.
+ ///
+ /// [plf]: crate::layer#per-layer-filtering
+ #[cfg_attr(docsrs, doc(notable_trait))]
+ pub trait Filter<S> {
+ /// Returns `true` if this layer is interested in a span or event with the
+ /// given [`Metadata`] in the current [`Context`], similarly to
+ /// [`Subscriber::enabled`].
+ ///
+ /// If this returns `false`, the span or event will be disabled _for the
+ /// wrapped [`Layer`]_. Unlike [`Layer::enabled`], the span or event will
+ /// still be recorded if any _other_ layers choose to enable it. However,
+ /// the layer [filtered] by this filter will skip recording that span or
+ /// event.
+ ///
+ /// If all layers indicate that they do not wish to see this span or event,
+ /// it will be disabled.
+ ///
+ /// [`metadata`]: tracing_core::Metadata
+ /// [`Subscriber::enabled`]: tracing_core::Subscriber::enabled
+ /// [filtered]: crate::filter::Filtered
+ fn enabled(&self, meta: &Metadata<'_>, cx: &Context<'_, S>) -> bool;
+
+ /// Returns an [`Interest`] indicating whether this layer will [always],
+ /// [sometimes], or [never] be interested in the given [`Metadata`].
+ ///
+ /// When a given callsite will [always] or [never] be enabled, the results
+ /// of evaluating the filter may be cached for improved performance.
+ /// Therefore, if a filter is capable of determining that it will always or
+ /// never enable a particular callsite, providing an implementation of this
+ /// function is recommended.
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: If a <code>Filter</code> will perform
+ /// <em>dynamic filtering</em> that depends on the current context in which
+ /// a span or event was observered (e.g. only enabling an event when it
+ /// occurs within a particular span), it <strong>must</strong> return
+ /// <code>Interest::sometimes()</code> from this method. If it returns
+ /// <code>Interest::always()</code> or <code>Interest::never()</code>, the
+ /// <code>enabled</code> method may not be called when a particular instance
+ /// of that span or event is recorded.
+ /// </pre>
+ ///
+ /// This method is broadly similar to [`Subscriber::register_callsite`];
+ /// however, since the returned value represents only the interest of
+ /// *this* layer, the resulting behavior is somewhat different.
+ ///
+ /// If a [`Subscriber`] returns [`Interest::always()`][always] or
+ /// [`Interest::never()`][never] for a given [`Metadata`], its [`enabled`]
+ /// method is then *guaranteed* to never be called for that callsite. On the
+ /// other hand, when a `Filter` returns [`Interest::always()`][always] or
+ /// [`Interest::never()`][never] for a callsite, _other_ [`Layer`]s may have
+ /// differing interests in that callsite. If this is the case, the callsite
+ /// will recieve [`Interest::sometimes()`][sometimes], and the [`enabled`]
+ /// method will still be called for that callsite when it records a span or
+ /// event.
+ ///
+ /// Returning [`Interest::always()`][always] or [`Interest::never()`][never] from
+ /// `Filter::callsite_enabled` will permanently enable or disable a
+ /// callsite (without requiring subsequent calls to [`enabled`]) if and only
+ /// if the following is true:
+ ///
+ /// - all [`Layer`]s that comprise the subscriber include `Filter`s
+ /// (this includes a tree of [`Layered`] layers that share the same
+ /// `Filter`)
+ /// - all those `Filter`s return the same [`Interest`].
+ ///
+ /// For example, if a [`Subscriber`] consists of two [`Filtered`] layers,
+ /// and both of those layers return [`Interest::never()`][never], that
+ /// callsite *will* never be enabled, and the [`enabled`] methods of those
+ /// [`Filter`]s will not be called.
+ ///
+ /// ## Default Implementation
+ ///
+ /// The default implementation of this method assumes that the
+ /// `Filter`'s [`enabled`] method _may_ perform dynamic filtering, and
+ /// returns [`Interest::sometimes()`][sometimes], to ensure that [`enabled`]
+ /// is called to determine whether a particular _instance_ of the callsite
+ /// is enabled in the current context. If this is *not* the case, and the
+ /// `Filter`'s [`enabled`] method will always return the same result
+ /// for a particular [`Metadata`], this method can be overridden as
+ /// follows:
+ ///
+ /// ```
+ /// use tracing_subscriber::layer;
+ /// use tracing_core::{Metadata, subscriber::Interest};
+ ///
+ /// struct MyFilter {
+ /// // ...
+ /// }
+ ///
+ /// impl MyFilter {
+ /// // The actual logic for determining whether a `Metadata` is enabled
+ /// // must be factored out from the `enabled` method, so that it can be
+ /// // called without a `Context` (which is not provided to the
+ /// // `callsite_enabled` method).
+ /// fn is_enabled(&self, metadata: &Metadata<'_>) -> bool {
+ /// // ...
+ /// # drop(metadata); true
+ /// }
+ /// }
+ ///
+ /// impl<S> layer::Filter<S> for MyFilter {
+ /// fn enabled(&self, metadata: &Metadata<'_>, _: &layer::Context<'_, S>) -> bool {
+ /// // Even though we are implementing `callsite_enabled`, we must still provide a
+ /// // working implementation of `enabled`, as returning `Interest::always()` or
+ /// // `Interest::never()` will *allow* caching, but will not *guarantee* it.
+ /// // Other filters may still return `Interest::sometimes()`, so we may be
+ /// // asked again in `enabled`.
+ /// self.is_enabled(metadata)
+ /// }
+ ///
+ /// fn callsite_enabled(&self, metadata: &'static Metadata<'static>) -> Interest {
+ /// // The result of `self.enabled(metadata, ...)` will always be
+ /// // the same for any given `Metadata`, so we can convert it into
+ /// // an `Interest`:
+ /// if self.is_enabled(metadata) {
+ /// Interest::always()
+ /// } else {
+ /// Interest::never()
+ /// }
+ /// }
+ /// }
+ /// ```
+ ///
+ /// [`Metadata`]: tracing_core::Metadata
+ /// [`Interest`]: tracing_core::Interest
+ /// [always]: tracing_core::Interest::always
+ /// [sometimes]: tracing_core::Interest::sometimes
+ /// [never]: tracing_core::Interest::never
+ /// [`Subscriber::register_callsite`]: tracing_core::Subscriber::register_callsite
+ /// [`Subscriber`]: tracing_core::Subscriber
+ /// [`enabled`]: Filter::enabled
+ /// [`Filtered`]: crate::filter::Filtered
+ fn callsite_enabled(&self, meta: &'static Metadata<'static>) -> Interest {
+ let _ = meta;
+ Interest::sometimes()
+ }
+
+ /// Returns an optional hint of the highest [verbosity level][level] that
+ /// this `Filter` will enable.
+ ///
+ /// If this method returns a [`LevelFilter`], it will be used as a hint to
+ /// determine the most verbose level that will be enabled. This will allow
+ /// spans and events which are more verbose than that level to be skipped
+ /// more efficiently. An implementation of this method is optional, but
+ /// strongly encouraged.
+ ///
+ /// If the maximum level the `Filter` will enable can change over the
+ /// course of its lifetime, it is free to return a different value from
+ /// multiple invocations of this method. However, note that changes in the
+ /// maximum level will **only** be reflected after the callsite [`Interest`]
+ /// cache is rebuilt, by calling the
+ /// [`tracing_core::callsite::rebuild_interest_cache`][rebuild] function.
+ /// Therefore, if the `Filter will change the value returned by this
+ /// method, it is responsible for ensuring that
+ /// [`rebuild_interest_cache`][rebuild] is called after the value of the max
+ /// level changes.
+ ///
+ /// ## Default Implementation
+ ///
+ /// By default, this method returns `None`, indicating that the maximum
+ /// level is unknown.
+ ///
+ /// [level]: tracing_core::metadata::Level
+ /// [`LevelFilter`]: crate::filter::LevelFilter
+ /// [`Interest`]: tracing_core::subscriber::Interest
+ /// [rebuild]: tracing_core::callsite::rebuild_interest_cache
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ None
+ }
+ }
+}
+
+/// Extension trait adding a `with(Layer)` combinator to `Subscriber`s.
+pub trait SubscriberExt: Subscriber + crate::sealed::Sealed {
+ /// Wraps `self` with the provided `layer`.
+ fn with<L>(self, layer: L) -> Layered<L, Self>
+ where
+ L: Layer<Self>,
+ Self: Sized,
+ {
+ layer.with_subscriber(self)
+ }
+}
+
+/// A layer that does nothing.
+#[derive(Clone, Debug, Default)]
+pub struct Identity {
+ _p: (),
+}
+
+// === impl Layer ===
+
+impl<L, S> Layer<S> for Option<L>
+where
+ L: Layer<S>,
+ S: Subscriber,
+{
+ fn on_layer(&mut self, subscriber: &mut S) {
+ if let Some(ref mut layer) = self {
+ layer.on_layer(subscriber)
+ }
+ }
+
+ #[inline]
+ fn on_new_span(&self, attrs: &span::Attributes<'_>, id: &span::Id, ctx: Context<'_, S>) {
+ if let Some(ref inner) = self {
+ inner.on_new_span(attrs, id, ctx)
+ }
+ }
+
+ #[inline]
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ match self {
+ Some(ref inner) => inner.register_callsite(metadata),
+ None => Interest::always(),
+ }
+ }
+
+ #[inline]
+ fn enabled(&self, metadata: &Metadata<'_>, ctx: Context<'_, S>) -> bool {
+ match self {
+ Some(ref inner) => inner.enabled(metadata, ctx),
+ None => true,
+ }
+ }
+
+ #[inline]
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ match self {
+ Some(ref inner) => inner.max_level_hint(),
+ None => None,
+ }
+ }
+
+ #[inline]
+ fn on_record(&self, span: &span::Id, values: &span::Record<'_>, ctx: Context<'_, S>) {
+ if let Some(ref inner) = self {
+ inner.on_record(span, values, ctx);
+ }
+ }
+
+ #[inline]
+ fn on_follows_from(&self, span: &span::Id, follows: &span::Id, ctx: Context<'_, S>) {
+ if let Some(ref inner) = self {
+ inner.on_follows_from(span, follows, ctx);
+ }
+ }
+
+ #[inline]
+ fn on_event(&self, event: &Event<'_>, ctx: Context<'_, S>) {
+ if let Some(ref inner) = self {
+ inner.on_event(event, ctx);
+ }
+ }
+
+ #[inline]
+ fn on_enter(&self, id: &span::Id, ctx: Context<'_, S>) {
+ if let Some(ref inner) = self {
+ inner.on_enter(id, ctx);
+ }
+ }
+
+ #[inline]
+ fn on_exit(&self, id: &span::Id, ctx: Context<'_, S>) {
+ if let Some(ref inner) = self {
+ inner.on_exit(id, ctx);
+ }
+ }
+
+ #[inline]
+ fn on_close(&self, id: span::Id, ctx: Context<'_, S>) {
+ if let Some(ref inner) = self {
+ inner.on_close(id, ctx);
+ }
+ }
+
+ #[inline]
+ fn on_id_change(&self, old: &span::Id, new: &span::Id, ctx: Context<'_, S>) {
+ if let Some(ref inner) = self {
+ inner.on_id_change(old, new, ctx)
+ }
+ }
+
+ #[doc(hidden)]
+ #[inline]
+ unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()> {
+ if id == TypeId::of::<Self>() {
+ Some(self as *const _ as *const ())
+ } else {
+ self.as_ref().and_then(|inner| inner.downcast_raw(id))
+ }
+ }
+}
+
+feature! {
+ #![any(feature = "std", feature = "alloc")]
+
+ macro_rules! layer_impl_body {
+ () => {
+ #[inline]
+ fn on_layer(&mut self, subscriber: &mut S) {
+ self.deref_mut().on_layer(subscriber);
+ }
+
+ #[inline]
+ fn on_new_span(&self, attrs: &span::Attributes<'_>, id: &span::Id, ctx: Context<'_, S>) {
+ self.deref().on_new_span(attrs, id, ctx)
+ }
+
+ #[inline]
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ self.deref().register_callsite(metadata)
+ }
+
+ #[inline]
+ fn enabled(&self, metadata: &Metadata<'_>, ctx: Context<'_, S>) -> bool {
+ self.deref().enabled(metadata, ctx)
+ }
+
+ #[inline]
+ fn max_level_hint(&self) -> Option<LevelFilter> {
+ self.deref().max_level_hint()
+ }
+
+ #[inline]
+ fn on_record(&self, span: &span::Id, values: &span::Record<'_>, ctx: Context<'_, S>) {
+ self.deref().on_record(span, values, ctx)
+ }
+
+ #[inline]
+ fn on_follows_from(&self, span: &span::Id, follows: &span::Id, ctx: Context<'_, S>) {
+ self.deref().on_follows_from(span, follows, ctx)
+ }
+
+ #[inline]
+ fn on_event(&self, event: &Event<'_>, ctx: Context<'_, S>) {
+ self.deref().on_event(event, ctx)
+ }
+
+ #[inline]
+ fn on_enter(&self, id: &span::Id, ctx: Context<'_, S>) {
+ self.deref().on_enter(id, ctx)
+ }
+
+ #[inline]
+ fn on_exit(&self, id: &span::Id, ctx: Context<'_, S>) {
+ self.deref().on_exit(id, ctx)
+ }
+
+ #[inline]
+ fn on_close(&self, id: span::Id, ctx: Context<'_, S>) {
+ self.deref().on_close(id, ctx)
+ }
+
+ #[inline]
+ fn on_id_change(&self, old: &span::Id, new: &span::Id, ctx: Context<'_, S>) {
+ self.deref().on_id_change(old, new, ctx)
+ }
+
+ #[doc(hidden)]
+ #[inline]
+ unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()> {
+ self.deref().downcast_raw(id)
+ }
+ };
+ }
+
+ impl<L, S> Layer<S> for Box<L>
+ where
+ L: Layer<S>,
+ S: Subscriber,
+ {
+ layer_impl_body! {}
+ }
+
+ impl<S> Layer<S> for Box<dyn Layer<S> + Send + Sync>
+ where
+ S: Subscriber,
+ {
+ layer_impl_body! {}
+ }
+}
+
+// === impl SubscriberExt ===
+
+impl<S: Subscriber> crate::sealed::Sealed for S {}
+impl<S: Subscriber> SubscriberExt for S {}
+
+// === impl Identity ===
+
+impl<S: Subscriber> Layer<S> for Identity {}
+
+impl Identity {
+ /// Returns a new `Identity` layer.
+ pub fn new() -> Self {
+ Self { _p: () }
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/layer/tests.rs b/vendor/tracing-subscriber-0.3.3/src/layer/tests.rs
new file mode 100644
index 000000000..d7ad61769
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/layer/tests.rs
@@ -0,0 +1,308 @@
+use super::*;
+use tracing_core::subscriber::NoSubscriber;
+
+#[derive(Debug)]
+pub(crate) struct NopLayer;
+impl<S: Subscriber> Layer<S> for NopLayer {}
+
+#[allow(dead_code)]
+struct NopLayer2;
+impl<S: Subscriber> Layer<S> for NopLayer2 {}
+
+/// A layer that holds a string.
+///
+/// Used to test that pointers returned by downcasting are actually valid.
+struct StringLayer(&'static str);
+impl<S: Subscriber> Layer<S> for StringLayer {}
+struct StringLayer2(&'static str);
+impl<S: Subscriber> Layer<S> for StringLayer2 {}
+
+struct StringLayer3(&'static str);
+impl<S: Subscriber> Layer<S> for StringLayer3 {}
+
+pub(crate) struct StringSubscriber(&'static str);
+
+impl Subscriber for StringSubscriber {
+ fn register_callsite(&self, _: &'static Metadata<'static>) -> Interest {
+ Interest::never()
+ }
+
+ fn enabled(&self, _: &Metadata<'_>) -> bool {
+ false
+ }
+
+ fn new_span(&self, _: &span::Attributes<'_>) -> span::Id {
+ span::Id::from_u64(1)
+ }
+
+ fn record(&self, _: &span::Id, _: &span::Record<'_>) {}
+ fn record_follows_from(&self, _: &span::Id, _: &span::Id) {}
+ fn event(&self, _: &Event<'_>) {}
+ fn enter(&self, _: &span::Id) {}
+ fn exit(&self, _: &span::Id) {}
+}
+
+fn assert_subscriber(_s: impl Subscriber) {}
+fn assert_layer<S: Subscriber>(_l: &impl Layer<S>) {}
+
+#[test]
+fn layer_is_subscriber() {
+ let s = NopLayer.with_subscriber(NoSubscriber::default());
+ assert_subscriber(s)
+}
+
+#[test]
+fn two_layers_are_subscriber() {
+ let s = NopLayer
+ .and_then(NopLayer)
+ .with_subscriber(NoSubscriber::default());
+ assert_subscriber(s)
+}
+
+#[test]
+fn three_layers_are_subscriber() {
+ let s = NopLayer
+ .and_then(NopLayer)
+ .and_then(NopLayer)
+ .with_subscriber(NoSubscriber::default());
+ assert_subscriber(s)
+}
+
+#[test]
+fn three_layers_are_layer() {
+ let layers = NopLayer.and_then(NopLayer).and_then(NopLayer);
+ assert_layer(&layers);
+ let _ = layers.with_subscriber(NoSubscriber::default());
+}
+
+#[test]
+#[cfg(feature = "alloc")]
+fn box_layer_is_layer() {
+ use alloc::boxed::Box;
+ let l: Box<dyn Layer<NoSubscriber> + Send + Sync> = Box::new(NopLayer);
+ assert_layer(&l);
+ l.with_subscriber(NoSubscriber::default());
+}
+
+#[test]
+fn downcasts_to_subscriber() {
+ let s = NopLayer
+ .and_then(NopLayer)
+ .and_then(NopLayer)
+ .with_subscriber(StringSubscriber("subscriber"));
+ let subscriber =
+ <dyn Subscriber>::downcast_ref::<StringSubscriber>(&s).expect("subscriber should downcast");
+ assert_eq!(subscriber.0, "subscriber");
+}
+
+#[test]
+fn downcasts_to_layer() {
+ let s = StringLayer("layer_1")
+ .and_then(StringLayer2("layer_2"))
+ .and_then(StringLayer3("layer_3"))
+ .with_subscriber(NoSubscriber::default());
+ let layer = <dyn Subscriber>::downcast_ref::<StringLayer>(&s).expect("layer 1 should downcast");
+ assert_eq!(layer.0, "layer_1");
+ let layer =
+ <dyn Subscriber>::downcast_ref::<StringLayer2>(&s).expect("layer 2 should downcast");
+ assert_eq!(layer.0, "layer_2");
+ let layer =
+ <dyn Subscriber>::downcast_ref::<StringLayer3>(&s).expect("layer 3 should downcast");
+ assert_eq!(layer.0, "layer_3");
+}
+
+#[cfg(all(feature = "registry", feature = "std"))]
+mod registry_tests {
+ use super::*;
+ use crate::registry::LookupSpan;
+
+ #[test]
+ fn context_event_span() {
+ use std::sync::{Arc, Mutex};
+ let last_event_span = Arc::new(Mutex::new(None));
+
+ struct RecordingLayer {
+ last_event_span: Arc<Mutex<Option<&'static str>>>,
+ }
+
+ impl<S> Layer<S> for RecordingLayer
+ where
+ S: Subscriber + for<'lookup> LookupSpan<'lookup>,
+ {
+ fn on_event(&self, event: &Event<'_>, ctx: Context<'_, S>) {
+ let span = ctx.event_span(event);
+ *self.last_event_span.lock().unwrap() = span.map(|s| s.name());
+ }
+ }
+
+ tracing::subscriber::with_default(
+ crate::registry().with(RecordingLayer {
+ last_event_span: last_event_span.clone(),
+ }),
+ || {
+ tracing::info!("no span");
+ assert_eq!(*last_event_span.lock().unwrap(), None);
+
+ let parent = tracing::info_span!("explicit");
+ tracing::info!(parent: &parent, "explicit span");
+ assert_eq!(*last_event_span.lock().unwrap(), Some("explicit"));
+
+ let _guard = tracing::info_span!("contextual").entered();
+ tracing::info!("contextual span");
+ assert_eq!(*last_event_span.lock().unwrap(), Some("contextual"));
+ },
+ );
+ }
+
+ /// Tests for how max-level hints are calculated when combining layers
+ /// with and without per-layer filtering.
+ mod max_level_hints {
+
+ use super::*;
+ use crate::filter::*;
+
+ #[test]
+ fn mixed_with_unfiltered() {
+ let subscriber = crate::registry()
+ .with(NopLayer)
+ .with(NopLayer.with_filter(LevelFilter::INFO));
+ assert_eq!(subscriber.max_level_hint(), None);
+ }
+
+ #[test]
+ fn mixed_with_unfiltered_layered() {
+ let subscriber = crate::registry().with(NopLayer).with(
+ NopLayer
+ .with_filter(LevelFilter::INFO)
+ .and_then(NopLayer.with_filter(LevelFilter::TRACE)),
+ );
+ assert_eq!(dbg!(subscriber).max_level_hint(), None);
+ }
+
+ #[test]
+ fn mixed_interleaved() {
+ let subscriber = crate::registry()
+ .with(NopLayer)
+ .with(NopLayer.with_filter(LevelFilter::INFO))
+ .with(NopLayer)
+ .with(NopLayer.with_filter(LevelFilter::INFO));
+ assert_eq!(dbg!(subscriber).max_level_hint(), None);
+ }
+
+ #[test]
+ fn mixed_layered() {
+ let subscriber = crate::registry()
+ .with(NopLayer.with_filter(LevelFilter::INFO).and_then(NopLayer))
+ .with(NopLayer.and_then(NopLayer.with_filter(LevelFilter::INFO)));
+ assert_eq!(dbg!(subscriber).max_level_hint(), None);
+ }
+
+ #[test]
+ fn plf_only_unhinted() {
+ let subscriber = crate::registry()
+ .with(NopLayer.with_filter(LevelFilter::INFO))
+ .with(NopLayer.with_filter(filter_fn(|_| true)));
+ assert_eq!(dbg!(subscriber).max_level_hint(), None);
+ }
+
+ #[test]
+ fn plf_only_unhinted_nested_outer() {
+ // if a nested tree of per-layer filters has an _outer_ filter with
+ // no max level hint, it should return `None`.
+ let subscriber = crate::registry()
+ .with(
+ NopLayer
+ .with_filter(LevelFilter::INFO)
+ .and_then(NopLayer.with_filter(LevelFilter::WARN)),
+ )
+ .with(
+ NopLayer
+ .with_filter(filter_fn(|_| true))
+ .and_then(NopLayer.with_filter(LevelFilter::DEBUG)),
+ );
+ assert_eq!(dbg!(subscriber).max_level_hint(), None);
+ }
+
+ #[test]
+ fn plf_only_unhinted_nested_inner() {
+ // If a nested tree of per-layer filters has an _inner_ filter with
+ // no max-level hint, but the _outer_ filter has a max level hint,
+ // it should pick the outer hint. This is because the outer filter
+ // will disable the spans/events before they make it to the inner
+ // filter.
+ let subscriber = dbg!(crate::registry().with(
+ NopLayer
+ .with_filter(filter_fn(|_| true))
+ .and_then(NopLayer.with_filter(filter_fn(|_| true)))
+ .with_filter(LevelFilter::INFO),
+ ));
+ assert_eq!(dbg!(subscriber).max_level_hint(), Some(LevelFilter::INFO));
+ }
+
+ #[test]
+ fn unhinted_nested_inner() {
+ let subscriber = dbg!(crate::registry()
+ .with(NopLayer.and_then(NopLayer).with_filter(LevelFilter::INFO))
+ .with(
+ NopLayer
+ .with_filter(filter_fn(|_| true))
+ .and_then(NopLayer.with_filter(filter_fn(|_| true)))
+ .with_filter(LevelFilter::WARN),
+ ));
+ assert_eq!(dbg!(subscriber).max_level_hint(), Some(LevelFilter::INFO));
+ }
+
+ #[test]
+ fn unhinted_nested_inner_mixed() {
+ let subscriber = dbg!(crate::registry()
+ .with(
+ NopLayer
+ .and_then(NopLayer.with_filter(filter_fn(|_| true)))
+ .with_filter(LevelFilter::INFO)
+ )
+ .with(
+ NopLayer
+ .with_filter(filter_fn(|_| true))
+ .and_then(NopLayer.with_filter(filter_fn(|_| true)))
+ .with_filter(LevelFilter::WARN),
+ ));
+ assert_eq!(dbg!(subscriber).max_level_hint(), Some(LevelFilter::INFO));
+ }
+
+ #[test]
+ fn plf_only_picks_max() {
+ let subscriber = crate::registry()
+ .with(NopLayer.with_filter(LevelFilter::WARN))
+ .with(NopLayer.with_filter(LevelFilter::DEBUG));
+ assert_eq!(dbg!(subscriber).max_level_hint(), Some(LevelFilter::DEBUG));
+ }
+
+ #[test]
+ fn many_plf_only_picks_max() {
+ let subscriber = crate::registry()
+ .with(NopLayer.with_filter(LevelFilter::WARN))
+ .with(NopLayer.with_filter(LevelFilter::DEBUG))
+ .with(NopLayer.with_filter(LevelFilter::INFO))
+ .with(NopLayer.with_filter(LevelFilter::ERROR));
+ assert_eq!(dbg!(subscriber).max_level_hint(), Some(LevelFilter::DEBUG));
+ }
+
+ #[test]
+ fn nested_plf_only_picks_max() {
+ let subscriber = crate::registry()
+ .with(
+ NopLayer.with_filter(LevelFilter::INFO).and_then(
+ NopLayer
+ .with_filter(LevelFilter::WARN)
+ .and_then(NopLayer.with_filter(LevelFilter::DEBUG)),
+ ),
+ )
+ .with(
+ NopLayer
+ .with_filter(LevelFilter::INFO)
+ .and_then(NopLayer.with_filter(LevelFilter::ERROR)),
+ );
+ assert_eq!(dbg!(subscriber).max_level_hint(), Some(LevelFilter::DEBUG));
+ }
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/lib.rs b/vendor/tracing-subscriber-0.3.3/src/lib.rs
new file mode 100644
index 000000000..563a86dee
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/lib.rs
@@ -0,0 +1,218 @@
+//! Utilities for implementing and composing [`tracing`] subscribers.
+//!
+//! [`tracing`] is a framework for instrumenting Rust programs to collect
+//! scoped, structured, and async-aware diagnostics. The [`Subscriber`] trait
+//! represents the functionality necessary to collect this trace data. This
+//! crate contains tools for composing subscribers out of smaller units of
+//! behaviour, and batteries-included implementations of common subscriber
+//! functionality.
+//!
+//! `tracing-subscriber` is intended for use by both `Subscriber` authors and
+//! application authors using `tracing` to instrument their applications.
+//!
+//! *Compiler support: [requires `rustc` 1.42+][msrv]*
+//!
+//! [msrv]: #supported-rust-versions
+//!
+//! ## `Layer`s and `Filter`s
+//!
+//! The most important component of the `tracing-subscriber` API is the
+//! [`Layer`] trait, which provides a composable abstraction for building
+//! [`Subscriber`]s. Like the [`Subscriber`] trait, a [`Layer`] defines a
+//! particular behavior for collecting trace data. Unlike [`Subscriber`]s,
+//! which implement a *complete* strategy for how trace data is collected,
+//! [`Layer`]s provide *modular* implementations of specific behaviors.
+//! Therefore, they can be [composed together] to form a [`Subscriber`] which is
+//! capable of recording traces in a variety of ways. See the [`layer` module's
+//! documentation][layer] for details on using [`Layer`]s.
+//!
+//! In addition, the [`Filter`] trait defines an interface for filtering what
+//! spans and events are recorded by a particular layer. This allows different
+//! [`Layer`]s to handle separate subsets of the trace data emitted by a
+//! program. See the [documentation on per-layer filtering][plf] for more
+//! information on using [`Filter`]s.
+//!
+//! [`Layer`]: crate::layer::Layer
+//! [composed together]: crate::layer#composing-layers
+//! [layer]: crate::layer
+//! [`Filter`]: crate::layer::Filter
+//! [plf]: crate::layer#per-layer-filtering
+//!
+//! ## Included Subscribers
+//!
+//! The following `Subscriber`s are provided for application authors:
+//!
+//! - [`fmt`] - Formats and logs tracing data (requires the `fmt` feature flag)
+//!
+//! ## Feature Flags
+//!
+//! - `std`: Enables APIs that depend on the on the Rust standard library
+//! (enabled by default).
+//! - `alloc`: Depend on [`liballoc`] (enabled by "std").
+//! - `env-filter`: Enables the [`EnvFilter`] type, which implements filtering
+//! similar to the [`env_logger` crate]. **Requires "std"**.
+//! - `fmt`: Enables the [`fmt`] module, which provides a subscriber
+//! implementation for printing formatted representations of trace events.
+//! Enabled by default. **Requires "std"**.
+//! - `ansi`: Enables `fmt` support for ANSI terminal colors. Enabled by
+//! default.
+//! - `registry`: enables the [`registry`] module. Enabled by default.
+//! **Requires "std"**.
+//! - `json`: Enables `fmt` support for JSON output. In JSON output, the ANSI
+//! feature does nothing. **Requires "fmt" and "std"**.
+//! - [`local-time`]: Enables local time formatting when using the [`time`
+//! crate]'s timestamp formatters with the `fmt` subscriber.
+//!
+//! ### Optional Dependencies
+//!
+//! - [`tracing-log`]: Enables better formatting for events emitted by `log`
+//! macros in the `fmt` subscriber. Enabled by default.
+//! - [`time`][`time` crate]: Enables support for using the [`time` crate] for timestamp
+//! formatting in the `fmt` subscriber.
+//! - [`smallvec`]: Causes the `EnvFilter` type to use the `smallvec` crate (rather
+//! than `Vec`) as a performance optimization. Enabled by default.
+//! - [`parking_lot`]: Use the `parking_lot` crate's `RwLock` implementation
+//! rather than the Rust standard library's implementation.
+//!
+//! ### `no_std` Support
+//!
+//! In embedded systems and other bare-metal applications, `tracing` can be
+//! used without requiring the Rust standard library, although some features are
+//! disabled. Although most of the APIs provided by `tracing-subscriber`, such
+//! as [`fmt`] and [`EnvFilter`], require the standard library, some
+//! functionality, such as the [`Subscriber`] trait, can still be used in
+//! `no_std` environments.
+//!
+//! The dependency on the standard library is controlled by two crate feature
+//! flags, "std", which enables the dependency on [`libstd`], and "alloc", which
+//! enables the dependency on [`liballoc`] (and is enabled by the "std"
+//! feature). These features are enabled by default, but `no_std` users can
+//! disable them using:
+//!
+//! ```toml
+//! # Cargo.toml
+//! tracing-subscriber = { version = "0.3", default-features = false }
+//! ```
+//!
+//! Additional APIs are available when [`liballoc`] is available. To enable
+//! `liballoc` but not `std`, use:
+//!
+//! ```toml
+//! # Cargo.toml
+//! tracing-subscriber = { version = "0.3", default-features = false, features = ["alloc"] }
+//! ```
+//!
+//! ## Supported Rust Versions
+//!
+//! Tracing is built against the latest stable release. The minimum supported
+//! version is 1.42. The current Tracing version is not guaranteed to build on
+//! Rust versions earlier than the minimum supported version.
+//!
+//! Tracing follows the same compiler support policies as the rest of the Tokio
+//! project. The current stable Rust compiler and the three most recent minor
+//! versions before it will always be supported. For example, if the current
+//! stable compiler version is 1.45, the minimum supported version will not be
+//! increased past 1.42, three minor versions prior. Increasing the minimum
+//! supported compiler version is not considered a semver breaking change as
+//! long as doing so complies with this policy.
+//!
+//! [`tracing`]: https://docs.rs/tracing/latest/tracing/
+//! [`Subscriber`]: https://docs.rs/tracing-core/latest/tracing_core/subscriber/trait.Subscriber.html
+//! [`EnvFilter`]: filter/struct.EnvFilter.html
+//! [`fmt`]: fmt/index.html
+//! [`tracing-log`]: https://crates.io/crates/tracing-log
+//! [`smallvec`]: https://crates.io/crates/smallvec
+//! [`env_logger` crate]: https://crates.io/crates/env_logger
+//! [`parking_lot`]: https://crates.io/crates/parking_lot
+//! [`time` crate]: https://crates.io/crates/time
+//! [`liballoc`]: https://doc.rust-lang.org/alloc/index.html
+#![doc(html_root_url = "https://docs.rs/tracing-subscriber/0.3.1")]
+#![doc(
+ html_logo_url = "https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png",
+ issue_tracker_base_url = "https://github.com/tokio-rs/tracing/issues/"
+)]
+#![cfg_attr(
+ docsrs,
+ // Allows displaying cfgs/feature flags in the documentation.
+ feature(doc_cfg),
+ // Allows adding traits to RustDoc's list of "notable traits"
+ feature(doc_notable_trait),
+ // Fail the docs build if any intra-docs links are broken
+ deny(rustdoc::broken_intra_doc_links),
+)]
+#![warn(
+ missing_debug_implementations,
+ missing_docs,
+ rust_2018_idioms,
+ unreachable_pub,
+ bad_style,
+ const_err,
+ dead_code,
+ improper_ctypes,
+ non_shorthand_field_patterns,
+ no_mangle_generic_items,
+ overflowing_literals,
+ path_statements,
+ patterns_in_fns_without_body,
+ private_in_public,
+ unconditional_recursion,
+ unused,
+ unused_allocation,
+ unused_comparisons,
+ unused_parens,
+ while_true
+)]
+// Using struct update syntax when a struct has no additional fields avoids
+// a potential source change if additional fields are added to the struct in the
+// future, reducing diff noise. Allow this even though clippy considers it
+// "needless".
+#![allow(clippy::needless_update)]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg(feature = "alloc")]
+extern crate alloc;
+
+#[macro_use]
+mod macros;
+
+pub mod field;
+pub mod filter;
+pub mod prelude;
+pub mod registry;
+
+pub mod layer;
+pub mod util;
+
+feature! {
+ #![feature = "std"]
+ pub mod reload;
+ pub(crate) mod sync;
+}
+
+feature! {
+ #![all(feature = "fmt", feature = "std")]
+ pub mod fmt;
+ pub use fmt::fmt;
+ pub use fmt::Subscriber as FmtSubscriber;
+}
+
+feature! {
+ #![all(feature = "env-filter", feature = "std")]
+ pub use filter::EnvFilter;
+}
+
+pub use layer::Layer;
+
+feature! {
+ #![all(feature = "registry", feature = "std")]
+ pub use registry::Registry;
+
+ ///
+ pub fn registry() -> Registry {
+ Registry::default()
+ }
+}
+
+mod sealed {
+ pub trait Sealed<A = ()> {}
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/macros.rs b/vendor/tracing-subscriber-0.3.3/src/macros.rs
new file mode 100644
index 000000000..81351132f
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/macros.rs
@@ -0,0 +1,28 @@
+#[cfg(feature = "std")]
+macro_rules! try_lock {
+ ($lock:expr) => {
+ try_lock!($lock, else return)
+ };
+ ($lock:expr, else $els:expr) => {
+ if let Ok(l) = $lock {
+ l
+ } else if std::thread::panicking() {
+ $els
+ } else {
+ panic!("lock poisoned")
+ }
+ };
+}
+
+macro_rules! feature {
+ (
+ #![$meta:meta]
+ $($item:item)*
+ ) => {
+ $(
+ #[cfg($meta)]
+ #[cfg_attr(docsrs, doc(cfg($meta)))]
+ $item
+ )*
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/prelude.rs b/vendor/tracing-subscriber-0.3.3/src/prelude.rs
new file mode 100644
index 000000000..c2230907b
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/prelude.rs
@@ -0,0 +1,19 @@
+//! The `tracing-subscriber` prelude.
+//!
+//! This brings into scope a number of extension traits that define methods on
+//! types defined here and in other crates.
+
+pub use crate::field::{
+ MakeExt as __tracing_subscriber_field_MakeExt,
+ RecordFields as __tracing_subscriber_field_RecordFields,
+};
+pub use crate::layer::{
+ Layer as __tracing_subscriber_Layer, SubscriberExt as __tracing_subscriber_SubscriberExt,
+};
+
+pub use crate::util::SubscriberInitExt as _;
+
+feature! {
+ #![all(feature = "fmt", feature = "std")]
+ pub use crate::fmt::writer::MakeWriterExt as _;
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/registry/extensions.rs b/vendor/tracing-subscriber-0.3.3/src/registry/extensions.rs
new file mode 100644
index 000000000..899e1549f
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/registry/extensions.rs
@@ -0,0 +1,274 @@
+// taken from https://github.com/hyperium/http/blob/master/src/extensions.rs.
+
+use crate::sync::{RwLockReadGuard, RwLockWriteGuard};
+use std::{
+ any::{Any, TypeId},
+ collections::HashMap,
+ fmt,
+ hash::{BuildHasherDefault, Hasher},
+};
+
+#[allow(warnings)]
+type AnyMap = HashMap<TypeId, Box<dyn Any + Send + Sync>, BuildHasherDefault<IdHasher>>;
+
+/// With TypeIds as keys, there's no need to hash them. They are already hashes
+/// themselves, coming from the compiler. The IdHasher holds the u64 of
+/// the TypeId, and then returns it, instead of doing any bit fiddling.
+#[derive(Default, Debug)]
+struct IdHasher(u64);
+
+impl Hasher for IdHasher {
+ fn write(&mut self, _: &[u8]) {
+ unreachable!("TypeId calls write_u64");
+ }
+
+ #[inline]
+ fn write_u64(&mut self, id: u64) {
+ self.0 = id;
+ }
+
+ #[inline]
+ fn finish(&self) -> u64 {
+ self.0
+ }
+}
+
+/// An immutable, read-only reference to a Span's extensions.
+#[derive(Debug)]
+#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
+pub struct Extensions<'a> {
+ inner: RwLockReadGuard<'a, ExtensionsInner>,
+}
+
+impl<'a> Extensions<'a> {
+ #[cfg(feature = "registry")]
+ pub(crate) fn new(inner: RwLockReadGuard<'a, ExtensionsInner>) -> Self {
+ Self { inner }
+ }
+
+ /// Immutably borrows a type previously inserted into this `Extensions`.
+ pub fn get<T: 'static>(&self) -> Option<&T> {
+ self.inner.get::<T>()
+ }
+}
+
+/// An mutable reference to a Span's extensions.
+#[derive(Debug)]
+#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
+pub struct ExtensionsMut<'a> {
+ inner: RwLockWriteGuard<'a, ExtensionsInner>,
+}
+
+impl<'a> ExtensionsMut<'a> {
+ #[cfg(feature = "registry")]
+ pub(crate) fn new(inner: RwLockWriteGuard<'a, ExtensionsInner>) -> Self {
+ Self { inner }
+ }
+
+ /// Insert a type into this `Extensions`.
+ ///
+ /// Note that extensions are _not_
+ /// `Layer`-specific—they are _span_-specific. This means that
+ /// other layers can access and mutate extensions that
+ /// a different Layer recorded. For example, an application might
+ /// have a layer that records execution timings, alongside a layer
+ /// that reports spans and events to a distributed
+ /// tracing system that requires timestamps for spans.
+ /// Ideally, if one layer records a timestamp _x_, the other layer
+ /// should be able to reuse timestamp _x_.
+ ///
+ /// Therefore, extensions should generally be newtypes, rather than common
+ /// types like [`String`](https://doc.rust-lang.org/std/string/struct.String.html), to avoid accidental
+ /// cross-`Layer` clobbering.
+ ///
+ /// ## Panics
+ ///
+ /// If `T` is already present in `Extensions`, then this method will panic.
+ pub fn insert<T: Send + Sync + 'static>(&mut self, val: T) {
+ assert!(self.replace(val).is_none())
+ }
+
+ /// Replaces an existing `T` into this extensions.
+ ///
+ /// If `T` is not present, `Option::None` will be returned.
+ pub fn replace<T: Send + Sync + 'static>(&mut self, val: T) -> Option<T> {
+ self.inner.insert(val)
+ }
+
+ /// Get a mutable reference to a type previously inserted on this `ExtensionsMut`.
+ pub fn get_mut<T: 'static>(&mut self) -> Option<&mut T> {
+ self.inner.get_mut::<T>()
+ }
+
+ /// Remove a type from this `Extensions`.
+ ///
+ /// If a extension of this type existed, it will be returned.
+ pub fn remove<T: Send + Sync + 'static>(&mut self) -> Option<T> {
+ self.inner.remove::<T>()
+ }
+}
+
+/// A type map of span extensions.
+///
+/// [ExtensionsInner] is used by `SpanData` to store and
+/// span-specific data. A given `Layer` can read and write
+/// data that it is interested in recording and emitting.
+#[derive(Default)]
+pub(crate) struct ExtensionsInner {
+ map: AnyMap,
+}
+
+impl ExtensionsInner {
+ /// Create an empty `Extensions`.
+ #[cfg(any(test, feature = "registry"))]
+ #[inline]
+ #[cfg(any(test, feature = "registry"))]
+ pub(crate) fn new() -> ExtensionsInner {
+ ExtensionsInner {
+ map: AnyMap::default(),
+ }
+ }
+
+ /// Insert a type into this `Extensions`.
+ ///
+ /// If a extension of this type already existed, it will
+ /// be returned.
+ pub(crate) fn insert<T: Send + Sync + 'static>(&mut self, val: T) -> Option<T> {
+ self.map
+ .insert(TypeId::of::<T>(), Box::new(val))
+ .and_then(|boxed| {
+ #[allow(warnings)]
+ {
+ (boxed as Box<Any + 'static>)
+ .downcast()
+ .ok()
+ .map(|boxed| *boxed)
+ }
+ })
+ }
+
+ /// Get a reference to a type previously inserted on this `Extensions`.
+ pub(crate) fn get<T: 'static>(&self) -> Option<&T> {
+ self.map
+ .get(&TypeId::of::<T>())
+ .and_then(|boxed| (&**boxed as &(dyn Any + 'static)).downcast_ref())
+ }
+
+ /// Get a mutable reference to a type previously inserted on this `Extensions`.
+ pub(crate) fn get_mut<T: 'static>(&mut self) -> Option<&mut T> {
+ self.map
+ .get_mut(&TypeId::of::<T>())
+ .and_then(|boxed| (&mut **boxed as &mut (dyn Any + 'static)).downcast_mut())
+ }
+
+ /// Remove a type from this `Extensions`.
+ ///
+ /// If a extension of this type existed, it will be returned.
+ pub(crate) fn remove<T: Send + Sync + 'static>(&mut self) -> Option<T> {
+ self.map.remove(&TypeId::of::<T>()).and_then(|boxed| {
+ #[allow(warnings)]
+ {
+ (boxed as Box<Any + 'static>)
+ .downcast()
+ .ok()
+ .map(|boxed| *boxed)
+ }
+ })
+ }
+
+ /// Clear the `ExtensionsInner` in-place, dropping any elements in the map but
+ /// retaining allocated capacity.
+ ///
+ /// This permits the hash map allocation to be pooled by the registry so
+ /// that future spans will not need to allocate new hashmaps.
+ #[cfg(any(test, feature = "registry"))]
+ pub(crate) fn clear(&mut self) {
+ self.map.clear();
+ }
+}
+
+impl fmt::Debug for ExtensionsInner {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Extensions")
+ .field("len", &self.map.len())
+ .field("capacity", &self.map.capacity())
+ .finish()
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[derive(Debug, PartialEq)]
+ struct MyType(i32);
+
+ #[test]
+ fn test_extensions() {
+ let mut extensions = ExtensionsInner::new();
+
+ extensions.insert(5i32);
+ extensions.insert(MyType(10));
+
+ assert_eq!(extensions.get(), Some(&5i32));
+ assert_eq!(extensions.get_mut(), Some(&mut 5i32));
+
+ assert_eq!(extensions.remove::<i32>(), Some(5i32));
+ assert!(extensions.get::<i32>().is_none());
+
+ assert_eq!(extensions.get::<bool>(), None);
+ assert_eq!(extensions.get(), Some(&MyType(10)));
+ }
+
+ #[test]
+ fn clear_retains_capacity() {
+ let mut extensions = ExtensionsInner::new();
+ extensions.insert(5i32);
+ extensions.insert(MyType(10));
+ extensions.insert(true);
+
+ assert_eq!(extensions.map.len(), 3);
+ let prev_capacity = extensions.map.capacity();
+ extensions.clear();
+
+ assert_eq!(
+ extensions.map.len(),
+ 0,
+ "after clear(), extensions map should have length 0"
+ );
+ assert_eq!(
+ extensions.map.capacity(),
+ prev_capacity,
+ "after clear(), extensions map should retain prior capacity"
+ );
+ }
+
+ #[test]
+ fn clear_drops_elements() {
+ use std::sync::Arc;
+ struct DropMePlease(Arc<()>);
+ struct DropMeTooPlease(Arc<()>);
+
+ let mut extensions = ExtensionsInner::new();
+ let val1 = DropMePlease(Arc::new(()));
+ let val2 = DropMeTooPlease(Arc::new(()));
+
+ let val1_dropped = Arc::downgrade(&val1.0);
+ let val2_dropped = Arc::downgrade(&val2.0);
+ extensions.insert(val1);
+ extensions.insert(val2);
+
+ assert!(val1_dropped.upgrade().is_some());
+ assert!(val2_dropped.upgrade().is_some());
+
+ extensions.clear();
+ assert!(
+ val1_dropped.upgrade().is_none(),
+ "after clear(), val1 should be dropped"
+ );
+ assert!(
+ val2_dropped.upgrade().is_none(),
+ "after clear(), val2 should be dropped"
+ );
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/registry/mod.rs b/vendor/tracing-subscriber-0.3.3/src/registry/mod.rs
new file mode 100644
index 000000000..f3b77b6a9
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/registry/mod.rs
@@ -0,0 +1,604 @@
+//! Storage for span data shared by multiple [`Layer`]s.
+//!
+//! ## Using the Span Registry
+//!
+//! This module provides the [`Registry`] type, a [`Subscriber`] implementation
+//! which tracks per-span data and exposes it to [`Layer`]s. When a `Registry`
+//! is used as the base `Subscriber` of a `Layer` stack, the
+//! [`layer::Context`][ctx] type will provide methods allowing `Layer`s to
+//! [look up span data][lookup] stored in the registry. While [`Registry`] is a
+//! reasonable default for storing spans and events, other stores that implement
+//! [`LookupSpan`] and [`Subscriber`] themselves (with [`SpanData`] implemented
+//! by the per-span data they store) can be used as a drop-in replacement.
+//!
+//! For example, we might create a `Registry` and add multiple `Layer`s like so:
+//! ```rust
+//! use tracing_subscriber::{registry::Registry, Layer, prelude::*};
+//! # use tracing_core::Subscriber;
+//! # pub struct FooLayer {}
+//! # pub struct BarLayer {}
+//! # impl<S: Subscriber> Layer<S> for FooLayer {}
+//! # impl<S: Subscriber> Layer<S> for BarLayer {}
+//! # impl FooLayer {
+//! # fn new() -> Self { Self {} }
+//! # }
+//! # impl BarLayer {
+//! # fn new() -> Self { Self {} }
+//! # }
+//!
+//! let subscriber = Registry::default()
+//! .with(FooLayer::new())
+//! .with(BarLayer::new());
+//! ```
+//!
+//! If a type implementing `Layer` depends on the functionality of a `Registry`
+//! implementation, it should bound its `Subscriber` type parameter with the
+//! [`LookupSpan`] trait, like so:
+//!
+//! ```rust
+//! use tracing_subscriber::{registry, Layer};
+//! use tracing_core::Subscriber;
+//!
+//! pub struct MyLayer {
+//! // ...
+//! }
+//!
+//! impl<S> Layer<S> for MyLayer
+//! where
+//! S: Subscriber + for<'a> registry::LookupSpan<'a>,
+//! {
+//! // ...
+//! }
+//! ```
+//! When this bound is added, the `Layer` implementation will be guaranteed
+//! access to the [`Context`][ctx] methods, such as [`Context::span`][lookup], that
+//! require the root subscriber to be a registry.
+//!
+//! [`Layer`]: crate::layer::Layer
+//! [`Subscriber`]:
+//! https://docs.rs/tracing-core/latest/tracing_core/subscriber/trait.Subscriber.html
+//! [ctx]: crate::layer::Context
+//! [lookup]: crate::layer::Context::span()
+use tracing_core::{field::FieldSet, span::Id, Metadata};
+
+feature! {
+ #![feature = "std"]
+ /// A module containing a type map of span extensions.
+ mod extensions;
+ pub use extensions::{Extensions, ExtensionsMut};
+
+}
+
+feature! {
+ #![all(feature = "registry", feature = "std")]
+
+ mod sharded;
+ mod stack;
+
+ pub use sharded::Data;
+ pub use sharded::Registry;
+
+ use crate::filter::FilterId;
+}
+
+/// Provides access to stored span data.
+///
+/// Subscribers which store span data and associate it with span IDs should
+/// implement this trait; if they do, any [`Layer`]s wrapping them can look up
+/// metadata via the [`Context`] type's [`span()`] method.
+///
+/// [`Layer`]: ../layer/trait.Layer.html
+/// [`Context`]: ../layer/struct.Context.html
+/// [`span()`]: ../layer/struct.Context.html#method.span
+pub trait LookupSpan<'a> {
+ /// The type of span data stored in this registry.
+ type Data: SpanData<'a>;
+
+ /// Returns the [`SpanData`] for a given `Id`, if it exists.
+ ///
+ /// <pre class="ignore" style="white-space:normal;font:inherit;">
+ /// <strong>Note</strong>: users of the <code>LookupSpan</code> trait should
+ /// typically call the <a href="#method.span"><code>span</code></a> method rather
+ /// than this method. The <code>span</code> method is implemented by
+ /// <em>calling</em> <code>span_data</code>, but returns a reference which is
+ /// capable of performing more sophisiticated queries.
+ /// </pre>
+ ///
+ /// [`SpanData`]: trait.SpanData.html
+ fn span_data(&'a self, id: &Id) -> Option<Self::Data>;
+
+ /// Returns a [`SpanRef`] for the span with the given `Id`, if it exists.
+ ///
+ /// A `SpanRef` is similar to [`SpanData`], but it allows performing
+ /// additional lookups against the registryr that stores the wrapped data.
+ ///
+ /// In general, _users_ of the `LookupSpan` trait should use this method
+ /// rather than the [`span_data`] method; while _implementors_ of this trait
+ /// should only implement `span_data`.
+ ///
+ /// [`SpanRef`]: struct.SpanRef.html
+ /// [`SpanData`]: trait.SpanData.html
+ /// [`span_data`]: #method.span_data
+ fn span(&'a self, id: &Id) -> Option<SpanRef<'_, Self>>
+ where
+ Self: Sized,
+ {
+ let data = self.span_data(id)?;
+ Some(SpanRef {
+ registry: self,
+ data,
+ #[cfg(feature = "registry")]
+ filter: FilterId::none(),
+ })
+ }
+
+ /// Registers a [`Filter`] for [per-layer filtering] with this
+ /// [`Subscriber`].
+ ///
+ /// The [`Filter`] can then use the returned [`FilterId`] to
+ /// [check if it previously enabled a span][check].
+ ///
+ /// # Panics
+ ///
+ /// If this `Subscriber` does not support [per-layer filtering].
+ ///
+ /// [`Filter`]: crate::layer::Filter
+ /// [per-layer filtering]: crate::layer::Layer#per-layer-filtering
+ /// [`Subscriber`]: tracing_core::Subscriber
+ /// [`FilterId`]: crate::filter::FilterId
+ /// [check]: SpanData::is_enabled_for
+ #[cfg(feature = "registry")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "registry")))]
+ fn register_filter(&mut self) -> FilterId {
+ panic!(
+ "{} does not currently support filters",
+ std::any::type_name::<Self>()
+ )
+ }
+}
+
+/// A stored representation of data associated with a span.
+pub trait SpanData<'a> {
+ /// Returns this span's ID.
+ fn id(&self) -> Id;
+
+ /// Returns a reference to the span's `Metadata`.
+ fn metadata(&self) -> &'static Metadata<'static>;
+
+ /// Returns a reference to the ID
+ fn parent(&self) -> Option<&Id>;
+
+ /// Returns a reference to this span's `Extensions`.
+ ///
+ /// The extensions may be used by `Layer`s to store additional data
+ /// describing the span.
+ #[cfg(feature = "std")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
+ fn extensions(&self) -> Extensions<'_>;
+
+ /// Returns a mutable reference to this span's `Extensions`.
+ ///
+ /// The extensions may be used by `Layer`s to store additional data
+ /// describing the span.
+ #[cfg(feature = "std")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
+ fn extensions_mut(&self) -> ExtensionsMut<'_>;
+
+ /// Returns `true` if this span is enabled for the [per-layer filter][plf]
+ /// corresponding to the provided [`FilterId`].
+ ///
+ /// ## Default Implementation
+ ///
+ /// By default, this method assumes that the [`LookupSpan`] implementation
+ /// does not support [per-layer filtering][plf], and always returns `true`.
+ ///
+ /// [plf]: crate::layer::Layer#per-layer-filtering
+ /// [`FilterId`]: crate::filter::FilterId
+ #[cfg(feature = "registry")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "registry")))]
+ fn is_enabled_for(&self, filter: FilterId) -> bool {
+ let _ = filter;
+ true
+ }
+}
+
+/// A reference to [span data] and the associated [registry].
+///
+/// This type implements all the same methods as [`SpanData`][span data], and
+/// provides additional methods for querying the registry based on values from
+/// the span.
+///
+/// [span data]: trait.SpanData.html
+/// [registry]: trait.LookupSpan.html
+#[derive(Debug)]
+pub struct SpanRef<'a, R: LookupSpan<'a>> {
+ registry: &'a R,
+ data: R::Data,
+
+ #[cfg(feature = "registry")]
+ filter: FilterId,
+}
+
+/// An iterator over the parents of a span, ordered from leaf to root.
+///
+/// This is returned by the [`SpanRef::scope`] method.
+#[derive(Debug)]
+pub struct Scope<'a, R> {
+ registry: &'a R,
+ next: Option<Id>,
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ filter: FilterId,
+}
+
+feature! {
+ #![any(feature = "alloc", feature = "std")]
+
+ #[cfg(not(feature = "smallvec"))]
+ use alloc::vec::{self, Vec};
+
+ use core::{fmt,iter};
+
+ /// An iterator over the parents of a span, ordered from root to leaf.
+ ///
+ /// This is returned by the [`Scope::from_root`] method.
+ pub struct ScopeFromRoot<'a, R>
+ where
+ R: LookupSpan<'a>,
+ {
+ #[cfg(feature = "smallvec")]
+ spans: iter::Rev<smallvec::IntoIter<SpanRefVecArray<'a, R>>>,
+ #[cfg(not(feature = "smallvec"))]
+ spans: iter::Rev<vec::IntoIter<SpanRef<'a, R>>>,
+ }
+
+ #[cfg(feature = "smallvec")]
+ type SpanRefVecArray<'span, L> = [SpanRef<'span, L>; 16];
+
+ impl<'a, R> Scope<'a, R>
+ where
+ R: LookupSpan<'a>,
+ {
+ /// Flips the order of the iterator, so that it is ordered from root to leaf.
+ ///
+ /// The iterator will first return the root span, then that span's immediate child,
+ /// and so on until it finally returns the span that [`SpanRef::scope`] was called on.
+ ///
+ /// If any items were consumed from the [`Scope`] before calling this method then they
+ /// will *not* be returned from the [`ScopeFromRoot`].
+ ///
+ /// **Note**: this will allocate if there are many spans remaining, or if the
+ /// "smallvec" feature flag is not enabled.
+ #[allow(clippy::wrong_self_convention)]
+ pub fn from_root(self) -> ScopeFromRoot<'a, R> {
+ #[cfg(feature = "smallvec")]
+ type Buf<T> = smallvec::SmallVec<T>;
+ #[cfg(not(feature = "smallvec"))]
+ type Buf<T> = Vec<T>;
+ ScopeFromRoot {
+ spans: self.collect::<Buf<_>>().into_iter().rev(),
+ }
+ }
+ }
+
+ impl<'a, R> Iterator for ScopeFromRoot<'a, R>
+ where
+ R: LookupSpan<'a>,
+ {
+ type Item = SpanRef<'a, R>;
+
+ #[inline]
+ fn next(&mut self) -> Option<Self::Item> {
+ self.spans.next()
+ }
+
+ #[inline]
+ fn size_hint(&self) -> (usize, Option<usize>) {
+ self.spans.size_hint()
+ }
+ }
+
+ impl<'a, R> fmt::Debug for ScopeFromRoot<'a, R>
+ where
+ R: LookupSpan<'a>,
+ {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.pad("ScopeFromRoot { .. }")
+ }
+ }
+}
+
+impl<'a, R> Iterator for Scope<'a, R>
+where
+ R: LookupSpan<'a>,
+{
+ type Item = SpanRef<'a, R>;
+
+ fn next(&mut self) -> Option<Self::Item> {
+ loop {
+ let curr = self.registry.span(self.next.as_ref()?)?;
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ let curr = curr.with_filter(self.filter);
+ self.next = curr.data.parent().cloned();
+
+ // If the `Scope` is filtered, check if the current span is enabled
+ // by the selected filter ID.
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ {
+ if !curr.is_enabled_for(self.filter) {
+ // The current span in the chain is disabled for this
+ // filter. Try its parent.
+ continue;
+ }
+ }
+
+ return Some(curr);
+ }
+ }
+}
+
+impl<'a, R> SpanRef<'a, R>
+where
+ R: LookupSpan<'a>,
+{
+ /// Returns this span's ID.
+ pub fn id(&self) -> Id {
+ self.data.id()
+ }
+
+ /// Returns a static reference to the span's metadata.
+ pub fn metadata(&self) -> &'static Metadata<'static> {
+ self.data.metadata()
+ }
+
+ /// Returns the span's name,
+ pub fn name(&self) -> &'static str {
+ self.data.metadata().name()
+ }
+
+ /// Returns a list of [fields] defined by the span.
+ ///
+ /// [fields]: https://docs.rs/tracing-core/latest/tracing_core/field/index.html
+ pub fn fields(&self) -> &FieldSet {
+ self.data.metadata().fields()
+ }
+
+ /// Returns a `SpanRef` describing this span's parent, or `None` if this
+ /// span is the root of its trace tree.
+ pub fn parent(&self) -> Option<Self> {
+ let id = self.data.parent()?;
+ let data = self.registry.span_data(id)?;
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ {
+ // move these into mut bindings if the registry feature is enabled,
+ // since they may be mutated in the loop.
+ let mut data = data;
+ loop {
+ // Is this parent enabled by our filter?
+ if data.is_enabled_for(self.filter) {
+ return Some(Self {
+ registry: self.registry,
+ filter: self.filter,
+ data,
+ });
+ }
+
+ // It's not enabled. If the disabled span has a parent, try that!
+ let id = data.parent()?;
+ data = self.registry.span_data(id)?;
+ }
+ }
+
+ #[cfg(not(all(feature = "registry", feature = "std")))]
+ Some(Self {
+ registry: self.registry,
+ data,
+ })
+ }
+
+ /// Returns an iterator over all parents of this span, starting with this span,
+ /// ordered from leaf to root.
+ ///
+ /// The iterator will first return the span, then the span's immediate parent,
+ /// followed by that span's parent, and so on, until it reaches a root span.
+ ///
+ /// ```rust
+ /// use tracing::{span, Subscriber};
+ /// use tracing_subscriber::{
+ /// layer::{Context, Layer},
+ /// prelude::*,
+ /// registry::LookupSpan,
+ /// };
+ ///
+ /// struct PrintingLayer;
+ /// impl<S> Layer<S> for PrintingLayer
+ /// where
+ /// S: Subscriber + for<'lookup> LookupSpan<'lookup>,
+ /// {
+ /// fn on_enter(&self, id: &span::Id, ctx: Context<S>) {
+ /// let span = ctx.span(id).unwrap();
+ /// let scope = span.scope().map(|span| span.name()).collect::<Vec<_>>();
+ /// println!("Entering span: {:?}", scope);
+ /// }
+ /// }
+ ///
+ /// tracing::subscriber::with_default(tracing_subscriber::registry().with(PrintingLayer), || {
+ /// let _root = tracing::info_span!("root").entered();
+ /// // Prints: Entering span: ["root"]
+ /// let _child = tracing::info_span!("child").entered();
+ /// // Prints: Entering span: ["child", "root"]
+ /// let _leaf = tracing::info_span!("leaf").entered();
+ /// // Prints: Entering span: ["leaf", "child", "root"]
+ /// });
+ /// ```
+ ///
+ /// If the opposite order (from the root to this span) is desired, calling [`Scope::from_root`] on
+ /// the returned iterator reverses the order.
+ ///
+ /// ```rust
+ /// # use tracing::{span, Subscriber};
+ /// # use tracing_subscriber::{
+ /// # layer::{Context, Layer},
+ /// # prelude::*,
+ /// # registry::LookupSpan,
+ /// # };
+ /// # struct PrintingLayer;
+ /// impl<S> Layer<S> for PrintingLayer
+ /// where
+ /// S: Subscriber + for<'lookup> LookupSpan<'lookup>,
+ /// {
+ /// fn on_enter(&self, id: &span::Id, ctx: Context<S>) {
+ /// let span = ctx.span(id).unwrap();
+ /// let scope = span.scope().from_root().map(|span| span.name()).collect::<Vec<_>>();
+ /// println!("Entering span: {:?}", scope);
+ /// }
+ /// }
+ ///
+ /// tracing::subscriber::with_default(tracing_subscriber::registry().with(PrintingLayer), || {
+ /// let _root = tracing::info_span!("root").entered();
+ /// // Prints: Entering span: ["root"]
+ /// let _child = tracing::info_span!("child").entered();
+ /// // Prints: Entering span: ["root", "child"]
+ /// let _leaf = tracing::info_span!("leaf").entered();
+ /// // Prints: Entering span: ["root", "child", "leaf"]
+ /// });
+ /// ```
+ pub fn scope(&self) -> Scope<'a, R> {
+ Scope {
+ registry: self.registry,
+ next: Some(self.id()),
+
+ #[cfg(feature = "registry")]
+ filter: self.filter,
+ }
+ }
+
+ /// Returns a reference to this span's `Extensions`.
+ ///
+ /// The extensions may be used by `Layer`s to store additional data
+ /// describing the span.
+ #[cfg(feature = "std")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
+ pub fn extensions(&self) -> Extensions<'_> {
+ self.data.extensions()
+ }
+
+ /// Returns a mutable reference to this span's `Extensions`.
+ ///
+ /// The extensions may be used by `Layer`s to store additional data
+ /// describing the span.
+ #[cfg(feature = "std")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
+ pub fn extensions_mut(&self) -> ExtensionsMut<'_> {
+ self.data.extensions_mut()
+ }
+
+ #[cfg(all(feature = "registry", feature = "std"))]
+ pub(crate) fn try_with_filter(self, filter: FilterId) -> Option<Self> {
+ if self.is_enabled_for(filter) {
+ return Some(self.with_filter(filter));
+ }
+
+ None
+ }
+
+ #[inline]
+ #[cfg(all(feature = "registry", feature = "std"))]
+ pub(crate) fn is_enabled_for(&self, filter: FilterId) -> bool {
+ self.data.is_enabled_for(filter)
+ }
+
+ #[inline]
+ #[cfg(all(feature = "registry", feature = "std"))]
+ fn with_filter(self, filter: FilterId) -> Self {
+ Self { filter, ..self }
+ }
+}
+
+#[cfg(all(test, feature = "registry", feature = "std"))]
+mod tests {
+ use crate::{
+ layer::{Context, Layer},
+ prelude::*,
+ registry::LookupSpan,
+ };
+ use std::sync::{Arc, Mutex};
+ use tracing::{span, Subscriber};
+
+ #[test]
+ fn spanref_scope_iteration_order() {
+ let last_entered_scope = Arc::new(Mutex::new(Vec::new()));
+
+ #[derive(Default)]
+ struct PrintingLayer {
+ last_entered_scope: Arc<Mutex<Vec<&'static str>>>,
+ }
+
+ impl<S> Layer<S> for PrintingLayer
+ where
+ S: Subscriber + for<'lookup> LookupSpan<'lookup>,
+ {
+ fn on_enter(&self, id: &span::Id, ctx: Context<'_, S>) {
+ let span = ctx.span(id).unwrap();
+ let scope = span.scope().map(|span| span.name()).collect::<Vec<_>>();
+ *self.last_entered_scope.lock().unwrap() = scope;
+ }
+ }
+
+ let _guard = tracing::subscriber::set_default(crate::registry().with(PrintingLayer {
+ last_entered_scope: last_entered_scope.clone(),
+ }));
+
+ let _root = tracing::info_span!("root").entered();
+ assert_eq!(&*last_entered_scope.lock().unwrap(), &["root"]);
+ let _child = tracing::info_span!("child").entered();
+ assert_eq!(&*last_entered_scope.lock().unwrap(), &["child", "root"]);
+ let _leaf = tracing::info_span!("leaf").entered();
+ assert_eq!(
+ &*last_entered_scope.lock().unwrap(),
+ &["leaf", "child", "root"]
+ );
+ }
+
+ #[test]
+ fn spanref_scope_fromroot_iteration_order() {
+ let last_entered_scope = Arc::new(Mutex::new(Vec::new()));
+
+ #[derive(Default)]
+ struct PrintingLayer {
+ last_entered_scope: Arc<Mutex<Vec<&'static str>>>,
+ }
+
+ impl<S> Layer<S> for PrintingLayer
+ where
+ S: Subscriber + for<'lookup> LookupSpan<'lookup>,
+ {
+ fn on_enter(&self, id: &span::Id, ctx: Context<'_, S>) {
+ let span = ctx.span(id).unwrap();
+ let scope = span
+ .scope()
+ .from_root()
+ .map(|span| span.name())
+ .collect::<Vec<_>>();
+ *self.last_entered_scope.lock().unwrap() = scope;
+ }
+ }
+
+ let _guard = tracing::subscriber::set_default(crate::registry().with(PrintingLayer {
+ last_entered_scope: last_entered_scope.clone(),
+ }));
+
+ let _root = tracing::info_span!("root").entered();
+ assert_eq!(&*last_entered_scope.lock().unwrap(), &["root"]);
+ let _child = tracing::info_span!("child").entered();
+ assert_eq!(&*last_entered_scope.lock().unwrap(), &["root", "child",]);
+ let _leaf = tracing::info_span!("leaf").entered();
+ assert_eq!(
+ &*last_entered_scope.lock().unwrap(),
+ &["root", "child", "leaf"]
+ );
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/registry/sharded.rs b/vendor/tracing-subscriber-0.3.3/src/registry/sharded.rs
new file mode 100644
index 000000000..a6311cb71
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/registry/sharded.rs
@@ -0,0 +1,904 @@
+use sharded_slab::{pool::Ref, Clear, Pool};
+use thread_local::ThreadLocal;
+
+use super::stack::SpanStack;
+use crate::{
+ filter::{FilterId, FilterMap, FilterState},
+ registry::{
+ extensions::{Extensions, ExtensionsInner, ExtensionsMut},
+ LookupSpan, SpanData,
+ },
+ sync::RwLock,
+};
+use std::{
+ cell::{self, Cell, RefCell},
+ sync::atomic::{fence, AtomicUsize, Ordering},
+};
+use tracing_core::{
+ dispatcher::{self, Dispatch},
+ span::{self, Current, Id},
+ Event, Interest, Metadata, Subscriber,
+};
+
+/// A shared, reusable store for spans.
+///
+/// A `Registry` is a [`Subscriber`] around which multiple [`Layer`]s
+/// implementing various behaviors may be [added]. Unlike other types
+/// implementing `Subscriber`, `Registry` does not actually record traces itself:
+/// instead, it collects and stores span data that is exposed to any [`Layer`]s
+/// wrapping it through implementations of the [`LookupSpan`] trait.
+/// The `Registry` is responsible for storing span metadata, recording
+/// relationships between spans, and tracking which spans are active and which
+/// are closed. In addition, it provides a mechanism for [`Layer`]s to store
+/// user-defined per-span data, called [extensions], in the registry. This
+/// allows [`Layer`]-specific data to benefit from the `Registry`'s
+/// high-performance concurrent storage.
+///
+/// This registry is implemented using a [lock-free sharded slab][slab], and is
+/// highly optimized for concurrent access.
+///
+/// # Span ID Generation
+///
+/// Span IDs are not globally unique, but the registry ensures that
+/// no two currently active spans have the same ID within a process.
+///
+/// One of the primary responsibilities of the registry is to generate [span
+/// IDs]. Therefore, it's important for other code that interacts with the
+/// registry, such as [`Layer`]s, to understand the guarantees of the
+/// span IDs that are generated.
+///
+/// The registry's span IDs are guaranteed to be unique **at a given point
+/// in time**. This means that an active span will never be assigned the
+/// same ID as another **currently active** span. However, the registry
+/// **will** eventually reuse the IDs of [closed] spans, although an ID
+/// will never be reassigned immediately after a span has closed.
+///
+/// Spans are not [considered closed] by the `Registry` until *every*
+/// [`Span`] reference with that ID has been dropped.
+///
+/// Thus: span IDs generated by the registry should be considered unique
+/// only at a given point in time, and only relative to other spans
+/// generated by the same process. Two spans with the same ID will not exist
+/// in the same process concurrently. However, if historical span data is
+/// being stored, the same ID may occur for multiple spans times in that
+/// data. If spans must be uniquely identified in historical data, the user
+/// code storing this data must assign its own unique identifiers to those
+/// spans. A counter is generally sufficient for this.
+///
+/// Similarly, span IDs generated by the registry are not unique outside of
+/// a given process. Distributed tracing systems may require identifiers
+/// that are unique across multiple processes on multiple machines (for
+/// example, [OpenTelemetry's `SpanId`s and `TraceId`s][ot]). `tracing` span
+/// IDs generated by the registry should **not** be used for this purpose.
+/// Instead, code which integrates with a distributed tracing system should
+/// generate and propagate its own IDs according to the rules specified by
+/// the distributed tracing system. These IDs can be associated with
+/// `tracing` spans using [fields] and/or [stored span data].
+///
+/// [span IDs]: https://docs.rs/tracing-core/latest/tracing_core/span/struct.Id.html
+/// [slab]: https://docs.rs/crate/sharded-slab/
+/// [`Layer`]: crate::Layer
+/// [added]: crate::layer::Layer#composing-layers
+/// [extensions]: super::Extensions
+/// [closed]: https://docs.rs/tracing/latest/tracing/span/index.html#closing-spans
+/// [considered closed]: https://docs.rs/tracing-core/latest/tracing_core/subscriber/trait.Subscriber.html#method.try_close
+/// [`Span`]: https://docs.rs/tracing/latest/tracing/span/struct.Span.html
+/// [ot]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/api.md#spancontext
+/// [fields]: https://docs.rs/tracing-core/latest/tracing-core/field/index.html
+/// [stored span data]: crate::registry::SpanData::extensions_mut
+#[cfg(feature = "registry")]
+#[cfg_attr(docsrs, doc(cfg(all(feature = "registry", feature = "std"))))]
+#[derive(Debug)]
+pub struct Registry {
+ spans: Pool<DataInner>,
+ current_spans: ThreadLocal<RefCell<SpanStack>>,
+ next_filter_id: u8,
+}
+
+/// Span data stored in a [`Registry`].
+///
+/// The registry stores well-known data defined by tracing: span relationships,
+/// metadata and reference counts. Additional user-defined data provided by
+/// [`Layer`s], such as formatted fields, metrics, or distributed traces should
+/// be stored in the [extensions] typemap.
+///
+/// [`Registry`]: struct.Registry.html
+/// [`Layer`s]: ../layer/trait.Layer.html
+/// [extensions]: struct.Extensions.html
+#[cfg(feature = "registry")]
+#[cfg_attr(docsrs, doc(cfg(all(feature = "registry", feature = "std"))))]
+#[derive(Debug)]
+pub struct Data<'a> {
+ /// Immutable reference to the pooled `DataInner` entry.
+ inner: Ref<'a, DataInner>,
+}
+
+/// Stored data associated with a span.
+///
+/// This type is pooled using `sharded_slab::Pool`; when a span is dropped, the
+/// `DataInner` entry at that span's slab index is cleared in place and reused
+/// by a future span. Thus, the `Default` and `sharded_slab::Clear`
+/// implementations for this type are load-bearing.
+#[derive(Debug)]
+struct DataInner {
+ filter_map: FilterMap,
+ metadata: &'static Metadata<'static>,
+ parent: Option<Id>,
+ ref_count: AtomicUsize,
+ // The span's `Extensions` typemap. Allocations for the `HashMap` backing
+ // this are pooled and reused in place.
+ pub(crate) extensions: RwLock<ExtensionsInner>,
+}
+
+// === impl Registry ===
+
+impl Default for Registry {
+ fn default() -> Self {
+ Self {
+ spans: Pool::new(),
+ current_spans: ThreadLocal::new(),
+ next_filter_id: 0,
+ }
+ }
+}
+
+#[inline]
+fn idx_to_id(idx: usize) -> Id {
+ Id::from_u64(idx as u64 + 1)
+}
+
+#[inline]
+fn id_to_idx(id: &Id) -> usize {
+ id.into_u64() as usize - 1
+}
+
+/// A guard that tracks how many [`Registry`]-backed `Layer`s have
+/// processed an `on_close` event.
+///
+/// This is needed to enable a [`Registry`]-backed Layer to access span
+/// data after the `Layer` has recieved the `on_close` callback.
+///
+/// Once all `Layer`s have processed this event, the [`Registry`] knows
+/// that is able to safely remove the span tracked by `id`. `CloseGuard`
+/// accomplishes this through a two-step process:
+/// 1. Whenever a [`Registry`]-backed `Layer::on_close` method is
+/// called, `Registry::start_close` is closed.
+/// `Registry::start_close` increments a thread-local `CLOSE_COUNT`
+/// by 1 and returns a `CloseGuard`.
+/// 2. The `CloseGuard` is dropped at the end of `Layer::on_close`. On
+/// drop, `CloseGuard` checks thread-local `CLOSE_COUNT`. If
+/// `CLOSE_COUNT` is 0, the `CloseGuard` removes the span with the
+/// `id` from the registry, as all `Layers` that might have seen the
+/// `on_close` notification have processed it. If `CLOSE_COUNT` is
+/// greater than 0, `CloseGuard` decrements the counter by one and
+/// _does not_ remove the span from the [`Registry`].
+///
+/// [`Registry`]: ./struct.Registry.html
+pub(crate) struct CloseGuard<'a> {
+ id: Id,
+ registry: &'a Registry,
+ is_closing: bool,
+}
+
+impl Registry {
+ fn get(&self, id: &Id) -> Option<Ref<'_, DataInner>> {
+ self.spans.get(id_to_idx(id))
+ }
+
+ /// Returns a guard which tracks how many `Layer`s have
+ /// processed an `on_close` notification via the `CLOSE_COUNT` thread-local.
+ /// For additional details, see [`CloseGuard`].
+ ///
+ /// [`CloseGuard`]: ./struct.CloseGuard.html
+ pub(crate) fn start_close(&self, id: Id) -> CloseGuard<'_> {
+ CLOSE_COUNT.with(|count| {
+ let c = count.get();
+ count.set(c + 1);
+ });
+ CloseGuard {
+ id,
+ registry: self,
+ is_closing: false,
+ }
+ }
+
+ pub(crate) fn has_per_layer_filters(&self) -> bool {
+ self.next_filter_id > 0
+ }
+
+ pub(crate) fn span_stack(&self) -> cell::Ref<'_, SpanStack> {
+ self.current_spans.get_or_default().borrow()
+ }
+}
+
+thread_local! {
+ /// `CLOSE_COUNT` is the thread-local counter used by `CloseGuard` to
+ /// track how many layers have processed the close.
+ /// For additional details, see [`CloseGuard`].
+ ///
+ /// [`CloseGuard`]: ./struct.CloseGuard.html
+ static CLOSE_COUNT: Cell<usize> = Cell::new(0);
+}
+
+impl Subscriber for Registry {
+ fn register_callsite(&self, _: &'static Metadata<'static>) -> Interest {
+ if self.has_per_layer_filters() {
+ return FilterState::take_interest().unwrap_or_else(Interest::always);
+ }
+
+ Interest::always()
+ }
+
+ fn enabled(&self, _: &Metadata<'_>) -> bool {
+ if self.has_per_layer_filters() {
+ return FilterState::event_enabled();
+ }
+ true
+ }
+
+ #[inline]
+ fn new_span(&self, attrs: &span::Attributes<'_>) -> span::Id {
+ let parent = if attrs.is_root() {
+ None
+ } else if attrs.is_contextual() {
+ self.current_span().id().map(|id| self.clone_span(id))
+ } else {
+ attrs.parent().map(|id| self.clone_span(id))
+ };
+
+ let id = self
+ .spans
+ // Check out a `DataInner` entry from the pool for the new span. If
+ // there are free entries already allocated in the pool, this will
+ // preferentially reuse one; otherwise, a new `DataInner` is
+ // allocated and added to the pool.
+ .create_with(|data| {
+ data.metadata = attrs.metadata();
+ data.parent = parent;
+ data.filter_map = crate::filter::FILTERING.with(|filtering| filtering.filter_map());
+ #[cfg(debug_assertions)]
+ {
+ if data.filter_map != FilterMap::default() {
+ debug_assert!(self.has_per_layer_filters());
+ }
+ }
+
+ let refs = data.ref_count.get_mut();
+ debug_assert_eq!(*refs, 0);
+ *refs = 1;
+ })
+ .expect("Unable to allocate another span");
+ idx_to_id(id)
+ }
+
+ /// This is intentionally not implemented, as recording fields
+ /// on a span is the responsibility of layers atop of this registry.
+ #[inline]
+ fn record(&self, _: &span::Id, _: &span::Record<'_>) {}
+
+ fn record_follows_from(&self, _span: &span::Id, _follows: &span::Id) {}
+
+ /// This is intentionally not implemented, as recording events
+ /// is the responsibility of layers atop of this registry.
+ fn event(&self, _: &Event<'_>) {}
+
+ fn enter(&self, id: &span::Id) {
+ if self
+ .current_spans
+ .get_or_default()
+ .borrow_mut()
+ .push(id.clone())
+ {
+ self.clone_span(id);
+ }
+ }
+
+ fn exit(&self, id: &span::Id) {
+ if let Some(spans) = self.current_spans.get() {
+ if spans.borrow_mut().pop(id) {
+ dispatcher::get_default(|dispatch| dispatch.try_close(id.clone()));
+ }
+ }
+ }
+
+ fn clone_span(&self, id: &span::Id) -> span::Id {
+ let span = self
+ .get(id)
+ .unwrap_or_else(|| panic!(
+ "tried to clone {:?}, but no span exists with that ID\n\
+ This may be caused by consuming a parent span (`parent: span`) rather than borrowing it (`parent: &span`).",
+ id,
+ ));
+ // Like `std::sync::Arc`, adds to the ref count (on clone) don't require
+ // a strong ordering; if we call` clone_span`, the reference count must
+ // always at least 1. The only synchronization necessary is between
+ // calls to `try_close`: we have to ensure that all threads have
+ // dropped their refs to the span before the span is closed.
+ let refs = span.ref_count.fetch_add(1, Ordering::Relaxed);
+ assert_ne!(
+ refs, 0,
+ "tried to clone a span ({:?}) that already closed",
+ id
+ );
+ id.clone()
+ }
+
+ fn current_span(&self) -> Current {
+ self.current_spans
+ .get()
+ .and_then(|spans| {
+ let spans = spans.borrow();
+ let id = spans.current()?;
+ let span = self.get(id)?;
+ Some(Current::new(id.clone(), span.metadata))
+ })
+ .unwrap_or_else(Current::none)
+ }
+
+ /// Decrements the reference count of the span with the given `id`, and
+ /// removes the span if it is zero.
+ ///
+ /// The allocated span slot will be reused when a new span is created.
+ fn try_close(&self, id: span::Id) -> bool {
+ let span = match self.get(&id) {
+ Some(span) => span,
+ None if std::thread::panicking() => return false,
+ None => panic!("tried to drop a ref to {:?}, but no such span exists!", id),
+ };
+
+ let refs = span.ref_count.fetch_sub(1, Ordering::Release);
+ if !std::thread::panicking() {
+ assert!(refs < std::usize::MAX, "reference count overflow!");
+ }
+ if refs > 1 {
+ return false;
+ }
+
+ // Synchronize if we are actually removing the span (stolen
+ // from std::Arc); this ensures that all other `try_close` calls on
+ // other threads happen-before we actually remove the span.
+ fence(Ordering::Acquire);
+ true
+ }
+}
+
+impl<'a> LookupSpan<'a> for Registry {
+ type Data = Data<'a>;
+
+ fn span_data(&'a self, id: &Id) -> Option<Self::Data> {
+ let inner = self.get(id)?;
+ Some(Data { inner })
+ }
+
+ fn register_filter(&mut self) -> FilterId {
+ let id = FilterId::new(self.next_filter_id);
+ self.next_filter_id += 1;
+ id
+ }
+}
+
+// === impl CloseGuard ===
+
+impl<'a> CloseGuard<'a> {
+ pub(crate) fn is_closing(&mut self) {
+ self.is_closing = true;
+ }
+}
+
+impl<'a> Drop for CloseGuard<'a> {
+ fn drop(&mut self) {
+ // If this returns with an error, we are already panicking. At
+ // this point, there's nothing we can really do to recover
+ // except by avoiding a double-panic.
+ let _ = CLOSE_COUNT.try_with(|count| {
+ let c = count.get();
+ // Decrement the count to indicate that _this_ guard's
+ // `on_close` callback has completed.
+ //
+ // Note that we *must* do this before we actually remove the span
+ // from the registry, since dropping the `DataInner` may trigger a
+ // new close, if this span is the last reference to a parent span.
+ count.set(c - 1);
+
+ // If the current close count is 1, this stack frame is the last
+ // `on_close` call. If the span is closing, it's okay to remove the
+ // span.
+ if c == 1 && self.is_closing {
+ self.registry.spans.clear(id_to_idx(&self.id));
+ }
+ });
+ }
+}
+
+// === impl Data ===
+
+impl<'a> SpanData<'a> for Data<'a> {
+ fn id(&self) -> Id {
+ idx_to_id(self.inner.key())
+ }
+
+ fn metadata(&self) -> &'static Metadata<'static> {
+ (*self).inner.metadata
+ }
+
+ fn parent(&self) -> Option<&Id> {
+ self.inner.parent.as_ref()
+ }
+
+ fn extensions(&self) -> Extensions<'_> {
+ Extensions::new(self.inner.extensions.read().expect("Mutex poisoned"))
+ }
+
+ fn extensions_mut(&self) -> ExtensionsMut<'_> {
+ ExtensionsMut::new(self.inner.extensions.write().expect("Mutex poisoned"))
+ }
+
+ #[inline]
+ fn is_enabled_for(&self, filter: FilterId) -> bool {
+ self.inner.filter_map.is_enabled(filter)
+ }
+}
+
+// === impl DataInner ===
+
+impl Default for DataInner {
+ fn default() -> Self {
+ // Since `DataInner` owns a `&'static Callsite` pointer, we need
+ // something to use as the initial default value for that callsite.
+ // Since we can't access a `DataInner` until it has had actual span data
+ // inserted into it, the null metadata will never actually be accessed.
+ struct NullCallsite;
+ impl tracing_core::callsite::Callsite for NullCallsite {
+ fn set_interest(&self, _: Interest) {
+ unreachable!(
+ "/!\\ Tried to register the null callsite /!\\\n \
+ This should never have happened and is definitely a bug. \
+ A `tracing` bug report would be appreciated."
+ )
+ }
+
+ fn metadata(&self) -> &Metadata<'_> {
+ unreachable!(
+ "/!\\ Tried to access the null callsite's metadata /!\\\n \
+ This should never have happened and is definitely a bug. \
+ A `tracing` bug report would be appreciated."
+ )
+ }
+ }
+
+ static NULL_CALLSITE: NullCallsite = NullCallsite;
+ static NULL_METADATA: Metadata<'static> = tracing_core::metadata! {
+ name: "",
+ target: "",
+ level: tracing_core::Level::TRACE,
+ fields: &[],
+ callsite: &NULL_CALLSITE,
+ kind: tracing_core::metadata::Kind::SPAN,
+ };
+
+ Self {
+ filter_map: FilterMap::default(),
+ metadata: &NULL_METADATA,
+ parent: None,
+ ref_count: AtomicUsize::new(0),
+ extensions: RwLock::new(ExtensionsInner::new()),
+ }
+ }
+}
+
+impl Clear for DataInner {
+ /// Clears the span's data in place, dropping the parent's reference count.
+ fn clear(&mut self) {
+ // A span is not considered closed until all of its children have closed.
+ // Therefore, each span's `DataInner` holds a "reference" to the parent
+ // span, keeping the parent span open until all its children have closed.
+ // When we close a span, we must then decrement the parent's ref count
+ // (potentially, allowing it to close, if this child is the last reference
+ // to that span).
+ // We have to actually unpack the option inside the `get_default`
+ // closure, since it is a `FnMut`, but testing that there _is_ a value
+ // here lets us avoid the thread-local access if we don't need the
+ // dispatcher at all.
+ if self.parent.is_some() {
+ // Note that --- because `Layered::try_close` works by calling
+ // `try_close` on the inner subscriber and using the return value to
+ // determine whether to call the `Layer`'s `on_close` callback ---
+ // we must call `try_close` on the entire subscriber stack, rather
+ // than just on the registry. If the registry called `try_close` on
+ // itself directly, the layers wouldn't see the close notification.
+ let subscriber = dispatcher::get_default(Dispatch::clone);
+ if let Some(parent) = self.parent.take() {
+ let _ = subscriber.try_close(parent);
+ }
+ }
+
+ // Clear (but do not deallocate!) the pooled `HashMap` for the span's extensions.
+ self.extensions
+ .get_mut()
+ .unwrap_or_else(|l| {
+ // This function can be called in a `Drop` impl, such as while
+ // panicking, so ignore lock poisoning.
+ l.into_inner()
+ })
+ .clear();
+
+ self.filter_map = FilterMap::default();
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use crate::{layer::Context, registry::LookupSpan, Layer};
+ use std::{
+ collections::HashMap,
+ sync::{Arc, Mutex, Weak},
+ };
+ use tracing::{self, subscriber::with_default};
+ use tracing_core::{
+ dispatcher,
+ span::{Attributes, Id},
+ Subscriber,
+ };
+
+ #[derive(Debug)]
+ struct DoesNothing;
+ impl<S: Subscriber> Layer<S> for DoesNothing {}
+
+ struct AssertionLayer;
+ impl<S> Layer<S> for AssertionLayer
+ where
+ S: Subscriber + for<'a> LookupSpan<'a>,
+ {
+ fn on_close(&self, id: Id, ctx: Context<'_, S>) {
+ dbg!(format_args!("closing {:?}", id));
+ assert!(&ctx.span(&id).is_some());
+ }
+ }
+
+ #[test]
+ fn single_layer_can_access_closed_span() {
+ let subscriber = AssertionLayer.with_subscriber(Registry::default());
+
+ with_default(subscriber, || {
+ let span = tracing::debug_span!("span");
+ drop(span);
+ });
+ }
+
+ #[test]
+ fn multiple_layers_can_access_closed_span() {
+ let subscriber = AssertionLayer
+ .and_then(AssertionLayer)
+ .with_subscriber(Registry::default());
+
+ with_default(subscriber, || {
+ let span = tracing::debug_span!("span");
+ drop(span);
+ });
+ }
+
+ struct CloseLayer {
+ inner: Arc<Mutex<CloseState>>,
+ }
+
+ struct CloseHandle {
+ state: Arc<Mutex<CloseState>>,
+ }
+
+ #[derive(Default)]
+ struct CloseState {
+ open: HashMap<&'static str, Weak<()>>,
+ closed: Vec<(&'static str, Weak<()>)>,
+ }
+
+ struct SetRemoved(Arc<()>);
+
+ impl<S> Layer<S> for CloseLayer
+ where
+ S: Subscriber + for<'a> LookupSpan<'a>,
+ {
+ fn on_new_span(&self, _: &Attributes<'_>, id: &Id, ctx: Context<'_, S>) {
+ let span = ctx.span(id).expect("Missing span; this is a bug");
+ let mut lock = self.inner.lock().unwrap();
+ let is_removed = Arc::new(());
+ assert!(
+ lock.open
+ .insert(span.name(), Arc::downgrade(&is_removed))
+ .is_none(),
+ "test layer saw multiple spans with the same name, the test is probably messed up"
+ );
+ let mut extensions = span.extensions_mut();
+ extensions.insert(SetRemoved(is_removed));
+ }
+
+ fn on_close(&self, id: Id, ctx: Context<'_, S>) {
+ let span = if let Some(span) = ctx.span(&id) {
+ span
+ } else {
+ println!(
+ "span {:?} did not exist in `on_close`, are we panicking?",
+ id
+ );
+ return;
+ };
+ let name = span.name();
+ println!("close {} ({:?})", name, id);
+ if let Ok(mut lock) = self.inner.lock() {
+ if let Some(is_removed) = lock.open.remove(name) {
+ assert!(is_removed.upgrade().is_some());
+ lock.closed.push((name, is_removed));
+ }
+ }
+ }
+ }
+
+ impl CloseLayer {
+ fn new() -> (Self, CloseHandle) {
+ let state = Arc::new(Mutex::new(CloseState::default()));
+ (
+ Self {
+ inner: state.clone(),
+ },
+ CloseHandle { state },
+ )
+ }
+ }
+
+ impl CloseState {
+ fn is_open(&self, span: &str) -> bool {
+ self.open.contains_key(span)
+ }
+
+ fn is_closed(&self, span: &str) -> bool {
+ self.closed.iter().any(|(name, _)| name == &span)
+ }
+ }
+
+ impl CloseHandle {
+ fn assert_closed(&self, span: &str) {
+ let lock = self.state.lock().unwrap();
+ assert!(
+ lock.is_closed(span),
+ "expected {} to be closed{}",
+ span,
+ if lock.is_open(span) {
+ " (it was still open)"
+ } else {
+ ", but it never existed (is there a problem with the test?)"
+ }
+ )
+ }
+
+ fn assert_open(&self, span: &str) {
+ let lock = self.state.lock().unwrap();
+ assert!(
+ lock.is_open(span),
+ "expected {} to be open{}",
+ span,
+ if lock.is_closed(span) {
+ " (it was still open)"
+ } else {
+ ", but it never existed (is there a problem with the test?)"
+ }
+ )
+ }
+
+ fn assert_removed(&self, span: &str) {
+ let lock = self.state.lock().unwrap();
+ let is_removed = match lock.closed.iter().find(|(name, _)| name == &span) {
+ Some((_, is_removed)) => is_removed,
+ None => panic!(
+ "expected {} to be removed from the registry, but it was not closed {}",
+ span,
+ if lock.is_closed(span) {
+ " (it was still open)"
+ } else {
+ ", but it never existed (is there a problem with the test?)"
+ }
+ ),
+ };
+ assert!(
+ is_removed.upgrade().is_none(),
+ "expected {} to have been removed from the registry",
+ span
+ )
+ }
+
+ fn assert_not_removed(&self, span: &str) {
+ let lock = self.state.lock().unwrap();
+ let is_removed = match lock.closed.iter().find(|(name, _)| name == &span) {
+ Some((_, is_removed)) => is_removed,
+ None if lock.is_open(span) => return,
+ None => unreachable!(),
+ };
+ assert!(
+ is_removed.upgrade().is_some(),
+ "expected {} to have been removed from the registry",
+ span
+ )
+ }
+
+ #[allow(unused)] // may want this for future tests
+ fn assert_last_closed(&self, span: Option<&str>) {
+ let lock = self.state.lock().unwrap();
+ let last = lock.closed.last().map(|(span, _)| span);
+ assert_eq!(
+ last,
+ span.as_ref(),
+ "expected {:?} to have closed last",
+ span
+ );
+ }
+
+ fn assert_closed_in_order(&self, order: impl AsRef<[&'static str]>) {
+ let lock = self.state.lock().unwrap();
+ let order = order.as_ref();
+ for (i, name) in order.iter().enumerate() {
+ assert_eq!(
+ lock.closed.get(i).map(|(span, _)| span),
+ Some(name),
+ "expected close order: {:?}, actual: {:?}",
+ order,
+ lock.closed.iter().map(|(name, _)| name).collect::<Vec<_>>()
+ );
+ }
+ }
+ }
+
+ #[test]
+ fn spans_are_removed_from_registry() {
+ let (close_layer, state) = CloseLayer::new();
+ let subscriber = AssertionLayer
+ .and_then(close_layer)
+ .with_subscriber(Registry::default());
+
+ // Create a `Dispatch` (which is internally reference counted) so that
+ // the subscriber lives to the end of the test. Otherwise, if we just
+ // passed the subscriber itself to `with_default`, we could see the span
+ // be dropped when the subscriber itself is dropped, destroying the
+ // registry.
+ let dispatch = dispatcher::Dispatch::new(subscriber);
+
+ dispatcher::with_default(&dispatch, || {
+ let span = tracing::debug_span!("span1");
+ drop(span);
+ let span = tracing::info_span!("span2");
+ drop(span);
+ });
+
+ state.assert_removed("span1");
+ state.assert_removed("span2");
+
+ // Ensure the registry itself outlives the span.
+ drop(dispatch);
+ }
+
+ #[test]
+ fn spans_are_only_closed_when_the_last_ref_drops() {
+ let (close_layer, state) = CloseLayer::new();
+ let subscriber = AssertionLayer
+ .and_then(close_layer)
+ .with_subscriber(Registry::default());
+
+ // Create a `Dispatch` (which is internally reference counted) so that
+ // the subscriber lives to the end of the test. Otherwise, if we just
+ // passed the subscriber itself to `with_default`, we could see the span
+ // be dropped when the subscriber itself is dropped, destroying the
+ // registry.
+ let dispatch = dispatcher::Dispatch::new(subscriber);
+
+ let span2 = dispatcher::with_default(&dispatch, || {
+ let span = tracing::debug_span!("span1");
+ drop(span);
+ let span2 = tracing::info_span!("span2");
+ let span2_clone = span2.clone();
+ drop(span2);
+ span2_clone
+ });
+
+ state.assert_removed("span1");
+ state.assert_not_removed("span2");
+
+ drop(span2);
+ state.assert_removed("span1");
+
+ // Ensure the registry itself outlives the span.
+ drop(dispatch);
+ }
+
+ #[test]
+ fn span_enter_guards_are_dropped_out_of_order() {
+ let (close_layer, state) = CloseLayer::new();
+ let subscriber = AssertionLayer
+ .and_then(close_layer)
+ .with_subscriber(Registry::default());
+
+ // Create a `Dispatch` (which is internally reference counted) so that
+ // the subscriber lives to the end of the test. Otherwise, if we just
+ // passed the subscriber itself to `with_default`, we could see the span
+ // be dropped when the subscriber itself is dropped, destroying the
+ // registry.
+ let dispatch = dispatcher::Dispatch::new(subscriber);
+
+ dispatcher::with_default(&dispatch, || {
+ let span1 = tracing::debug_span!("span1");
+ let span2 = tracing::info_span!("span2");
+
+ let enter1 = span1.enter();
+ let enter2 = span2.enter();
+
+ drop(enter1);
+ drop(span1);
+
+ state.assert_removed("span1");
+ state.assert_not_removed("span2");
+
+ drop(enter2);
+ state.assert_not_removed("span2");
+
+ drop(span2);
+ state.assert_removed("span1");
+ state.assert_removed("span2");
+ });
+ }
+
+ #[test]
+ fn child_closes_parent() {
+ // This test asserts that if a parent span's handle is dropped before
+ // a child span's handle, the parent will remain open until child
+ // closes, and will then be closed.
+
+ let (close_layer, state) = CloseLayer::new();
+ let subscriber = close_layer.with_subscriber(Registry::default());
+
+ let dispatch = dispatcher::Dispatch::new(subscriber);
+
+ dispatcher::with_default(&dispatch, || {
+ let span1 = tracing::info_span!("parent");
+ let span2 = tracing::info_span!(parent: &span1, "child");
+
+ state.assert_open("parent");
+ state.assert_open("child");
+
+ drop(span1);
+ state.assert_open("parent");
+ state.assert_open("child");
+
+ drop(span2);
+ state.assert_closed("parent");
+ state.assert_closed("child");
+ });
+ }
+
+ #[test]
+ fn child_closes_grandparent() {
+ // This test asserts that, when a span is kept open by a child which
+ // is *itself* kept open by a child, closing the grandchild will close
+ // both the parent *and* the grandparent.
+ let (close_layer, state) = CloseLayer::new();
+ let subscriber = close_layer.with_subscriber(Registry::default());
+
+ let dispatch = dispatcher::Dispatch::new(subscriber);
+
+ dispatcher::with_default(&dispatch, || {
+ let span1 = tracing::info_span!("grandparent");
+ let span2 = tracing::info_span!(parent: &span1, "parent");
+ let span3 = tracing::info_span!(parent: &span2, "child");
+
+ state.assert_open("grandparent");
+ state.assert_open("parent");
+ state.assert_open("child");
+
+ drop(span1);
+ drop(span2);
+ state.assert_open("grandparent");
+ state.assert_open("parent");
+ state.assert_open("child");
+
+ drop(span3);
+
+ state.assert_closed_in_order(&["child", "parent", "grandparent"]);
+ });
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/registry/stack.rs b/vendor/tracing-subscriber-0.3.3/src/registry/stack.rs
new file mode 100644
index 000000000..4a3f7e59d
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/registry/stack.rs
@@ -0,0 +1,77 @@
+pub(crate) use tracing_core::span::Id;
+
+#[derive(Debug)]
+struct ContextId {
+ id: Id,
+ duplicate: bool,
+}
+
+/// `SpanStack` tracks what spans are currently executing on a thread-local basis.
+///
+/// A "separate current span" for each thread is a semantic choice, as each span
+/// can be executing in a different thread.
+#[derive(Debug, Default)]
+pub(crate) struct SpanStack {
+ stack: Vec<ContextId>,
+}
+
+impl SpanStack {
+ #[inline]
+ pub(super) fn push(&mut self, id: Id) -> bool {
+ let duplicate = self.stack.iter().any(|i| i.id == id);
+ self.stack.push(ContextId { id, duplicate });
+ !duplicate
+ }
+
+ #[inline]
+ pub(super) fn pop(&mut self, expected_id: &Id) -> bool {
+ if let Some((idx, _)) = self
+ .stack
+ .iter()
+ .enumerate()
+ .rev()
+ .find(|(_, ctx_id)| ctx_id.id == *expected_id)
+ {
+ let ContextId { id: _, duplicate } = self.stack.remove(idx);
+ return !duplicate;
+ }
+ false
+ }
+
+ #[inline]
+ pub(crate) fn iter(&self) -> impl Iterator<Item = &Id> {
+ self.stack
+ .iter()
+ .rev()
+ .filter_map(|ContextId { id, duplicate }| if !*duplicate { Some(id) } else { None })
+ }
+
+ #[inline]
+ pub(crate) fn current(&self) -> Option<&Id> {
+ self.iter().next()
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::{Id, SpanStack};
+
+ #[test]
+ fn pop_last_span() {
+ let mut stack = SpanStack::default();
+ let id = Id::from_u64(1);
+ stack.push(id.clone());
+
+ assert!(stack.pop(&id));
+ }
+
+ #[test]
+ fn pop_first_span() {
+ let mut stack = SpanStack::default();
+ stack.push(Id::from_u64(1));
+ stack.push(Id::from_u64(2));
+
+ let id = Id::from_u64(1);
+ assert!(stack.pop(&id));
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/reload.rs b/vendor/tracing-subscriber-0.3.3/src/reload.rs
new file mode 100644
index 000000000..b8ec67dfa
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/reload.rs
@@ -0,0 +1,237 @@
+//! Wrapper for a `Layer` to allow it to be dynamically reloaded.
+//!
+//! This module provides a [`Layer` type] which wraps another type implementing
+//! the [`Layer` trait], allowing the wrapped type to be replaced with another
+//! instance of that type at runtime.
+//!
+//! This can be used in cases where a subset of `Subscriber` functionality
+//! should be dynamically reconfigured, such as when filtering directives may
+//! change at runtime. Note that this layer introduces a (relatively small)
+//! amount of overhead, and should thus only be used as needed.
+//!
+//! [`Layer` type]: struct.Layer.html
+//! [`Layer` trait]: ../layer/trait.Layer.html
+use crate::layer;
+use crate::sync::RwLock;
+
+use std::{
+ error, fmt,
+ marker::PhantomData,
+ sync::{Arc, Weak},
+};
+use tracing_core::{
+ callsite, span,
+ subscriber::{Interest, Subscriber},
+ Event, Metadata,
+};
+
+/// Wraps a `Layer`, allowing it to be reloaded dynamically at runtime.
+#[derive(Debug)]
+pub struct Layer<L, S> {
+ // TODO(eliza): this once used a `crossbeam_util::ShardedRwLock`. We may
+ // eventually wish to replace it with a sharded lock implementation on top
+ // of our internal `RwLock` wrapper type. If possible, we should profile
+ // this first to determine if it's necessary.
+ inner: Arc<RwLock<L>>,
+ _s: PhantomData<fn(S)>,
+}
+
+/// Allows reloading the state of an associated `Layer`.
+#[derive(Debug)]
+pub struct Handle<L, S> {
+ inner: Weak<RwLock<L>>,
+ _s: PhantomData<fn(S)>,
+}
+
+/// Indicates that an error occurred when reloading a layer.
+#[derive(Debug)]
+pub struct Error {
+ kind: ErrorKind,
+}
+
+#[derive(Debug)]
+enum ErrorKind {
+ SubscriberGone,
+ Poisoned,
+}
+
+// ===== impl Layer =====
+
+impl<L, S> crate::Layer<S> for Layer<L, S>
+where
+ L: crate::Layer<S> + 'static,
+ S: Subscriber,
+{
+ fn on_layer(&mut self, subscriber: &mut S) {
+ try_lock!(self.inner.write(), else return).on_layer(subscriber);
+ }
+
+ #[inline]
+ fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+ try_lock!(self.inner.read(), else return Interest::sometimes()).register_callsite(metadata)
+ }
+
+ #[inline]
+ fn enabled(&self, metadata: &Metadata<'_>, ctx: layer::Context<'_, S>) -> bool {
+ try_lock!(self.inner.read(), else return false).enabled(metadata, ctx)
+ }
+
+ #[inline]
+ fn on_new_span(&self, attrs: &span::Attributes<'_>, id: &span::Id, ctx: layer::Context<'_, S>) {
+ try_lock!(self.inner.read()).on_new_span(attrs, id, ctx)
+ }
+
+ #[inline]
+ fn on_record(&self, span: &span::Id, values: &span::Record<'_>, ctx: layer::Context<'_, S>) {
+ try_lock!(self.inner.read()).on_record(span, values, ctx)
+ }
+
+ #[inline]
+ fn on_follows_from(&self, span: &span::Id, follows: &span::Id, ctx: layer::Context<'_, S>) {
+ try_lock!(self.inner.read()).on_follows_from(span, follows, ctx)
+ }
+
+ #[inline]
+ fn on_event(&self, event: &Event<'_>, ctx: layer::Context<'_, S>) {
+ try_lock!(self.inner.read()).on_event(event, ctx)
+ }
+
+ #[inline]
+ fn on_enter(&self, id: &span::Id, ctx: layer::Context<'_, S>) {
+ try_lock!(self.inner.read()).on_enter(id, ctx)
+ }
+
+ #[inline]
+ fn on_exit(&self, id: &span::Id, ctx: layer::Context<'_, S>) {
+ try_lock!(self.inner.read()).on_exit(id, ctx)
+ }
+
+ #[inline]
+ fn on_close(&self, id: span::Id, ctx: layer::Context<'_, S>) {
+ try_lock!(self.inner.read()).on_close(id, ctx)
+ }
+
+ #[inline]
+ fn on_id_change(&self, old: &span::Id, new: &span::Id, ctx: layer::Context<'_, S>) {
+ try_lock!(self.inner.read()).on_id_change(old, new, ctx)
+ }
+}
+
+impl<L, S> Layer<L, S>
+where
+ L: crate::Layer<S> + 'static,
+ S: Subscriber,
+{
+ /// Wraps the given `Layer`, returning a `Layer` and a `Handle` that allows
+ /// the inner type to be modified at runtime.
+ pub fn new(inner: L) -> (Self, Handle<L, S>) {
+ let this = Self {
+ inner: Arc::new(RwLock::new(inner)),
+ _s: PhantomData,
+ };
+ let handle = this.handle();
+ (this, handle)
+ }
+
+ /// Returns a `Handle` that can be used to reload the wrapped `Layer`.
+ pub fn handle(&self) -> Handle<L, S> {
+ Handle {
+ inner: Arc::downgrade(&self.inner),
+ _s: PhantomData,
+ }
+ }
+}
+
+// ===== impl Handle =====
+
+impl<L, S> Handle<L, S>
+where
+ L: crate::Layer<S> + 'static,
+ S: Subscriber,
+{
+ /// Replace the current layer with the provided `new_layer`.
+ pub fn reload(&self, new_layer: impl Into<L>) -> Result<(), Error> {
+ self.modify(|layer| {
+ *layer = new_layer.into();
+ })
+ }
+
+ /// Invokes a closure with a mutable reference to the current layer,
+ /// allowing it to be modified in place.
+ pub fn modify(&self, f: impl FnOnce(&mut L)) -> Result<(), Error> {
+ let inner = self.inner.upgrade().ok_or(Error {
+ kind: ErrorKind::SubscriberGone,
+ })?;
+
+ let mut lock = try_lock!(inner.write(), else return Err(Error::poisoned()));
+ f(&mut *lock);
+ // Release the lock before rebuilding the interest cache, as that
+ // function will lock the new layer.
+ drop(lock);
+
+ callsite::rebuild_interest_cache();
+ Ok(())
+ }
+
+ /// Returns a clone of the layer's current value if it still exists.
+ /// Otherwise, if the subscriber has been dropped, returns `None`.
+ pub fn clone_current(&self) -> Option<L>
+ where
+ L: Clone,
+ {
+ self.with_current(L::clone).ok()
+ }
+
+ /// Invokes a closure with a borrowed reference to the current layer,
+ /// returning the result (or an error if the subscriber no longer exists).
+ pub fn with_current<T>(&self, f: impl FnOnce(&L) -> T) -> Result<T, Error> {
+ let inner = self.inner.upgrade().ok_or(Error {
+ kind: ErrorKind::SubscriberGone,
+ })?;
+ let inner = try_lock!(inner.read(), else return Err(Error::poisoned()));
+ Ok(f(&*inner))
+ }
+}
+
+impl<L, S> Clone for Handle<L, S> {
+ fn clone(&self) -> Self {
+ Handle {
+ inner: self.inner.clone(),
+ _s: PhantomData,
+ }
+ }
+}
+
+// ===== impl Error =====
+
+impl Error {
+ fn poisoned() -> Self {
+ Self {
+ kind: ErrorKind::Poisoned,
+ }
+ }
+
+ /// Returns `true` if this error occurred because the layer was poisoned by
+ /// a panic on another thread.
+ pub fn is_poisoned(&self) -> bool {
+ matches!(self.kind, ErrorKind::Poisoned)
+ }
+
+ /// Returns `true` if this error occurred because the `Subscriber`
+ /// containing the reloadable layer was dropped.
+ pub fn is_dropped(&self) -> bool {
+ matches!(self.kind, ErrorKind::SubscriberGone)
+ }
+}
+
+impl fmt::Display for Error {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let msg = match self.kind {
+ ErrorKind::SubscriberGone => "subscriber no longer exists",
+ ErrorKind::Poisoned => "lock poisoned",
+ };
+ f.pad(msg)
+ }
+}
+
+impl error::Error for Error {}
diff --git a/vendor/tracing-subscriber-0.3.3/src/sync.rs b/vendor/tracing-subscriber-0.3.3/src/sync.rs
new file mode 100644
index 000000000..ec42b834a
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/sync.rs
@@ -0,0 +1,57 @@
+//! Abstracts over sync primitive implementations.
+//!
+//! Optionally, we allow the Rust standard library's `RwLock` to be replaced
+//! with the `parking_lot` crate's implementation. This may provide improved
+//! performance in some cases. However, the `parking_lot` dependency is an
+//! opt-in feature flag. Because `parking_lot::RwLock` has a slightly different
+//! API than `std::sync::RwLock` (it does not support poisoning on panics), we
+//! wrap it with a type that provides the same method signatures. This allows us
+//! to transparently swap `parking_lot` in without changing code at the callsite.
+#[allow(unused_imports)] // may be used later;
+pub(crate) use std::sync::{LockResult, PoisonError, TryLockResult};
+
+#[cfg(not(feature = "parking_lot"))]
+pub(crate) use std::sync::{RwLock, RwLockReadGuard, RwLockWriteGuard};
+
+#[cfg(feature = "parking_lot")]
+pub(crate) use self::parking_lot_impl::*;
+
+#[cfg(feature = "parking_lot")]
+mod parking_lot_impl {
+ pub(crate) use parking_lot::{RwLockReadGuard, RwLockWriteGuard};
+ use std::sync::{LockResult, TryLockError, TryLockResult};
+
+ #[derive(Debug)]
+ pub(crate) struct RwLock<T> {
+ inner: parking_lot::RwLock<T>,
+ }
+
+ impl<T> RwLock<T> {
+ pub(crate) fn new(val: T) -> Self {
+ Self {
+ inner: parking_lot::RwLock::new(val),
+ }
+ }
+
+ #[inline]
+ pub(crate) fn get_mut(&mut self) -> LockResult<&mut T> {
+ Ok(self.inner.get_mut())
+ }
+
+ #[inline]
+ pub(crate) fn read(&self) -> LockResult<RwLockReadGuard<'_, T>> {
+ Ok(self.inner.read())
+ }
+
+ #[inline]
+ #[allow(dead_code)] // may be used later;
+ pub(crate) fn try_read(&self) -> TryLockResult<RwLockReadGuard<'_, T>> {
+ self.inner.try_read().ok_or(TryLockError::WouldBlock)
+ }
+
+ #[inline]
+ pub(crate) fn write(&self) -> LockResult<RwLockWriteGuard<'_, T>> {
+ Ok(self.inner.write())
+ }
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/src/util.rs b/vendor/tracing-subscriber-0.3.3/src/util.rs
new file mode 100644
index 000000000..1c98aa4d2
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/src/util.rs
@@ -0,0 +1,153 @@
+//! Extension traits and other utilities to make working with subscribers more
+//! ergonomic.
+use core::fmt;
+#[cfg(feature = "std")]
+use std::error::Error;
+use tracing_core::dispatcher::{self, Dispatch};
+#[cfg(feature = "tracing-log")]
+use tracing_log::AsLog;
+
+/// Extension trait adding utility methods for subscriber initialization.
+///
+/// This trait provides extension methods to make configuring and setting a
+/// [default subscriber] more ergonomic. It is automatically implemented for all
+/// types that can be converted into a [trace dispatcher]. Since `Dispatch`
+/// implements `From<T>` for all `T: Subscriber`, all `Subscriber`
+/// implementations will implement this extension trait as well. Types which
+/// can be converted into `Subscriber`s, such as builders that construct a
+/// `Subscriber`, may implement `Into<Dispatch>`, and will also receive an
+/// implementation of this trait.
+///
+/// [default subscriber]: https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber
+/// [trace dispatcher]: https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html
+pub trait SubscriberInitExt
+where
+ Self: Into<Dispatch>,
+{
+ /// Sets `self` as the [default subscriber] in the current scope, returning a
+ /// guard that will unset it when dropped.
+ ///
+ /// If the "tracing-log" feature flag is enabled, this will also initialize
+ /// a [`log`] compatibility layer. This allows the subscriber to consume
+ /// `log::Record`s as though they were `tracing` `Event`s.
+ ///
+ /// [default subscriber]: https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber
+ /// [`log`]: https://crates.io/log
+ #[cfg(feature = "std")]
+ #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
+ fn set_default(self) -> dispatcher::DefaultGuard {
+ #[cfg(feature = "tracing-log")]
+ let _ = tracing_log::LogTracer::init();
+
+ dispatcher::set_default(&self.into())
+ }
+
+ /// Attempts to set `self` as the [global default subscriber] in the current
+ /// scope, returning an error if one is already set.
+ ///
+ /// If the "tracing-log" feature flag is enabled, this will also attempt to
+ /// initialize a [`log`] compatibility layer. This allows the subscriber to
+ /// consume `log::Record`s as though they were `tracing` `Event`s.
+ ///
+ /// This method returns an error if a global default subscriber has already
+ /// been set, or if a `log` logger has already been set (when the
+ /// "tracing-log" feature is enabled).
+ ///
+ /// [global default subscriber]: https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber
+ /// [`log`]: https://crates.io/log
+ fn try_init(self) -> Result<(), TryInitError> {
+ dispatcher::set_global_default(self.into()).map_err(TryInitError::new)?;
+
+ // Since we are setting the global default subscriber, we can
+ // opportunistically go ahead and set its global max level hint as
+ // the max level for the `log` crate as well. This should make
+ // skipping `log` diagnostics much faster.
+ #[cfg(feature = "tracing-log")]
+ tracing_log::LogTracer::builder()
+ // Note that we must call this *after* setting the global default
+ // subscriber, so that we get its max level hint.
+ .with_max_level(tracing_core::LevelFilter::current().as_log())
+ .init()
+ .map_err(TryInitError::new)?;
+
+ Ok(())
+ }
+
+ /// Attempts to set `self` as the [global default subscriber] in the current
+ /// scope, panicking if this fails.
+ ///
+ /// If the "tracing-log" feature flag is enabled, this will also attempt to
+ /// initialize a [`log`] compatibility layer. This allows the subscriber to
+ /// consume `log::Record`s as though they were `tracing` `Event`s.
+ ///
+ /// This method panics if a global default subscriber has already been set,
+ /// or if a `log` logger has already been set (when the "tracing-log"
+ /// feature is enabled).
+ ///
+ /// [global default subscriber]: https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber
+ /// [`log`]: https://crates.io/log
+ fn init(self) {
+ self.try_init()
+ .expect("failed to set global default subscriber")
+ }
+}
+
+impl<T> SubscriberInitExt for T where T: Into<Dispatch> {}
+
+/// Error returned by [`try_init`](SubscriberInitExt::try_init) if a global default subscriber could not be initialized.
+pub struct TryInitError {
+ #[cfg(feature = "std")]
+ inner: Box<dyn Error + Send + Sync + 'static>,
+
+ #[cfg(not(feature = "std"))]
+ _p: (),
+}
+
+// ==== impl TryInitError ====
+
+impl TryInitError {
+ #[cfg(feature = "std")]
+ fn new(e: impl Into<Box<dyn Error + Send + Sync + 'static>>) -> Self {
+ Self { inner: e.into() }
+ }
+
+ #[cfg(not(feature = "std"))]
+ fn new<T>(_: T) -> Self {
+ Self { _p: () }
+ }
+}
+
+impl fmt::Debug for TryInitError {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ #[cfg(feature = "std")]
+ {
+ fmt::Debug::fmt(&self.inner, f)
+ }
+
+ #[cfg(not(feature = "std"))]
+ {
+ f.write_str("TryInitError(())")
+ }
+ }
+}
+
+impl fmt::Display for TryInitError {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ #[cfg(feature = "std")]
+ {
+ fmt::Display::fmt(&self.inner, f)
+ }
+
+ #[cfg(not(feature = "std"))]
+ {
+ f.write_str("failed to set global default subscriber")
+ }
+ }
+}
+
+#[cfg(feature = "std")]
+impl Error for TryInitError {
+ fn source(&self) -> Option<&(dyn Error + 'static)> {
+ self.inner.source()
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/cached_layer_filters_dont_break_other_layers.rs b/vendor/tracing-subscriber-0.3.3/tests/cached_layer_filters_dont_break_other_layers.rs
new file mode 100644
index 000000000..00e98a994
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/cached_layer_filters_dont_break_other_layers.rs
@@ -0,0 +1,123 @@
+#![cfg(feature = "registry")]
+mod support;
+use self::support::*;
+use tracing::Level;
+use tracing_subscriber::{filter::LevelFilter, prelude::*};
+
+#[test]
+fn layer_filters() {
+ let (unfiltered, unfiltered_handle) = unfiltered("unfiltered");
+ let (filtered, filtered_handle) = filtered("filtered");
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(unfiltered)
+ .with(filtered.with_filter(filter()))
+ .set_default();
+
+ events();
+
+ unfiltered_handle.assert_finished();
+ filtered_handle.assert_finished();
+}
+
+#[test]
+fn layered_layer_filters() {
+ let (unfiltered1, unfiltered1_handle) = unfiltered("unfiltered_1");
+ let (unfiltered2, unfiltered2_handle) = unfiltered("unfiltered_2");
+ let unfiltered = unfiltered1.and_then(unfiltered2);
+
+ let (filtered1, filtered1_handle) = filtered("filtered_1");
+ let (filtered2, filtered2_handle) = filtered("filtered_2");
+ let filtered = filtered1
+ .with_filter(filter())
+ .and_then(filtered2.with_filter(filter()));
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(unfiltered)
+ .with(filtered)
+ .set_default();
+
+ events();
+
+ unfiltered1_handle.assert_finished();
+ unfiltered2_handle.assert_finished();
+ filtered1_handle.assert_finished();
+ filtered2_handle.assert_finished();
+}
+
+#[test]
+fn out_of_order() {
+ let (unfiltered1, unfiltered1_handle) = unfiltered("unfiltered_1");
+ let (unfiltered2, unfiltered2_handle) = unfiltered("unfiltered_2");
+
+ let (filtered1, filtered1_handle) = filtered("filtered_1");
+ let (filtered2, filtered2_handle) = filtered("filtered_2");
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(unfiltered1)
+ .with(filtered1.with_filter(filter()))
+ .with(unfiltered2)
+ .with(filtered2.with_filter(filter()))
+ .set_default();
+ events();
+
+ unfiltered1_handle.assert_finished();
+ unfiltered2_handle.assert_finished();
+ filtered1_handle.assert_finished();
+ filtered2_handle.assert_finished();
+}
+
+#[test]
+fn mixed_layered() {
+ let (unfiltered1, unfiltered1_handle) = unfiltered("unfiltered_1");
+ let (unfiltered2, unfiltered2_handle) = unfiltered("unfiltered_2");
+ let (filtered1, filtered1_handle) = filtered("filtered_1");
+ let (filtered2, filtered2_handle) = filtered("filtered_2");
+
+ let layered1 = filtered1.with_filter(filter()).and_then(unfiltered1);
+ let layered2 = unfiltered2.and_then(filtered2.with_filter(filter()));
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(layered1)
+ .with(layered2)
+ .set_default();
+
+ events();
+
+ unfiltered1_handle.assert_finished();
+ unfiltered2_handle.assert_finished();
+ filtered1_handle.assert_finished();
+ filtered2_handle.assert_finished();
+}
+
+fn events() {
+ tracing::trace!("hello trace");
+ tracing::debug!("hello debug");
+ tracing::info!("hello info");
+ tracing::warn!("hello warn");
+ tracing::error!("hello error");
+}
+
+fn filter() -> LevelFilter {
+ LevelFilter::INFO
+}
+
+fn unfiltered(name: &str) -> (ExpectLayer, subscriber::MockHandle) {
+ layer::named(name)
+ .event(event::mock().at_level(Level::TRACE))
+ .event(event::mock().at_level(Level::DEBUG))
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle()
+}
+
+fn filtered(name: &str) -> (ExpectLayer, subscriber::MockHandle) {
+ layer::named(name)
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle()
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/duplicate_spans.rs b/vendor/tracing-subscriber-0.3.3/tests/duplicate_spans.rs
new file mode 100644
index 000000000..c4a736f74
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/duplicate_spans.rs
@@ -0,0 +1,48 @@
+#![cfg(all(feature = "env-filter", feature = "fmt"))]
+mod support;
+use tracing::{self, subscriber::with_default, Span};
+use tracing_subscriber::{filter::EnvFilter, FmtSubscriber};
+
+#[test]
+fn duplicate_spans() {
+ let subscriber = FmtSubscriber::builder()
+ .with_env_filter(EnvFilter::new("[root]=debug"))
+ .finish();
+
+ with_default(subscriber, || {
+ let root = tracing::debug_span!("root");
+ root.in_scope(|| {
+ // root:
+ assert_eq!(root, Span::current(), "Current span must be 'root'");
+ let leaf = tracing::debug_span!("leaf");
+ leaf.in_scope(|| {
+ // root:leaf:
+ assert_eq!(leaf, Span::current(), "Current span must be 'leaf'");
+ root.in_scope(|| {
+ // root:leaf:
+ assert_eq!(
+ leaf,
+ Span::current(),
+ "Current span must be 'leaf' after entering twice the 'root' span"
+ );
+ })
+ });
+ // root:
+ assert_eq!(
+ root,
+ Span::current(),
+ "Current span must be root ('leaf' exited, nested 'root' exited)"
+ );
+
+ root.in_scope(|| {
+ assert_eq!(root, Span::current(), "Current span must be root");
+ });
+ // root:
+ assert_eq!(
+ root,
+ Span::current(),
+ "Current span must still be root after exiting nested 'root'"
+ );
+ });
+ });
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/field_filter.rs b/vendor/tracing-subscriber-0.3.3/tests/field_filter.rs
new file mode 100644
index 000000000..12b4053b6
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/field_filter.rs
@@ -0,0 +1,115 @@
+#![cfg(feature = "env-filter")]
+mod support;
+use self::support::*;
+use tracing::{self, subscriber::with_default, Level};
+use tracing_subscriber::{filter::EnvFilter, prelude::*};
+
+#[test]
+#[cfg_attr(not(flaky_tests), ignore)]
+fn field_filter_events() {
+ let filter: EnvFilter = "[{thing}]=debug".parse().expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .event(
+ event::mock()
+ .at_level(Level::INFO)
+ .with_fields(field::mock("thing")),
+ )
+ .event(
+ event::mock()
+ .at_level(Level::DEBUG)
+ .with_fields(field::mock("thing")),
+ )
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+
+ with_default(subscriber, || {
+ tracing::trace!(disabled = true);
+ tracing::info!("also disabled");
+ tracing::info!(thing = 1);
+ tracing::debug!(thing = 2);
+ tracing::trace!(thing = 3);
+ });
+
+ finished.assert_finished();
+}
+
+#[test]
+#[cfg_attr(not(flaky_tests), ignore)]
+fn field_filter_spans() {
+ let filter: EnvFilter = "[{enabled=true}]=debug"
+ .parse()
+ .expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .enter(span::mock().named("span1"))
+ .event(
+ event::mock()
+ .at_level(Level::INFO)
+ .with_fields(field::mock("something")),
+ )
+ .exit(span::mock().named("span1"))
+ .enter(span::mock().named("span2"))
+ .exit(span::mock().named("span2"))
+ .enter(span::mock().named("span3"))
+ .event(
+ event::mock()
+ .at_level(Level::DEBUG)
+ .with_fields(field::mock("something")),
+ )
+ .exit(span::mock().named("span3"))
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+
+ with_default(subscriber, || {
+ tracing::trace!("disabled");
+ tracing::info!("also disabled");
+ tracing::info_span!("span1", enabled = true).in_scope(|| {
+ tracing::info!(something = 1);
+ });
+ tracing::debug_span!("span2", enabled = false, foo = "hi").in_scope(|| {
+ tracing::warn!(something = 2);
+ });
+ tracing::trace_span!("span3", enabled = true, answer = 42).in_scope(|| {
+ tracing::debug!(something = 2);
+ });
+ });
+
+ finished.assert_finished();
+}
+
+#[test]
+fn record_after_created() {
+ let filter: EnvFilter = "[{enabled=true}]=debug"
+ .parse()
+ .expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .enter(span::mock().named("span"))
+ .exit(span::mock().named("span"))
+ .record(
+ span::mock().named("span"),
+ field::mock("enabled").with_value(&true),
+ )
+ .enter(span::mock().named("span"))
+ .event(event::mock().at_level(Level::DEBUG))
+ .exit(span::mock().named("span"))
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+
+ with_default(subscriber, || {
+ let span = tracing::info_span!("span", enabled = false);
+ span.in_scope(|| {
+ tracing::debug!("i'm disabled!");
+ });
+
+ span.record("enabled", &true);
+ span.in_scope(|| {
+ tracing::debug!("i'm enabled!");
+ });
+
+ tracing::debug!("i'm also disabled");
+ });
+
+ finished.assert_finished();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/filter.rs b/vendor/tracing-subscriber-0.3.3/tests/filter.rs
new file mode 100644
index 000000000..8386d34d2
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/filter.rs
@@ -0,0 +1,187 @@
+#![cfg(feature = "env-filter")]
+
+mod support;
+use self::support::*;
+use tracing::{self, subscriber::with_default, Level};
+use tracing_subscriber::{
+ filter::{EnvFilter, LevelFilter},
+ prelude::*,
+};
+
+#[test]
+fn level_filter_event() {
+ let filter: EnvFilter = "info".parse().expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+
+ with_default(subscriber, || {
+ tracing::trace!("this should be disabled");
+ tracing::info!("this shouldn't be");
+ tracing::debug!(target: "foo", "this should also be disabled");
+ tracing::warn!(target: "foo", "this should be enabled");
+ tracing::error!("this should be enabled too");
+ });
+
+ finished.assert_finished();
+}
+
+#[test]
+fn same_name_spans() {
+ let filter: EnvFilter = "[foo{bar}]=trace,[foo{baz}]=trace"
+ .parse()
+ .expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .new_span(
+ span::mock()
+ .named("foo")
+ .at_level(Level::TRACE)
+ .with_field(field::mock("bar")),
+ )
+ .new_span(
+ span::mock()
+ .named("foo")
+ .at_level(Level::TRACE)
+ .with_field(field::mock("baz")),
+ )
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+ with_default(subscriber, || {
+ tracing::trace_span!("foo", bar = 1);
+ tracing::trace_span!("foo", baz = 1);
+ });
+
+ finished.assert_finished();
+}
+
+#[test]
+fn level_filter_event_with_target() {
+ let filter: EnvFilter = "info,stuff=debug".parse().expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::DEBUG).with_target("stuff"))
+ .event(event::mock().at_level(Level::WARN).with_target("stuff"))
+ .event(event::mock().at_level(Level::ERROR))
+ .event(event::mock().at_level(Level::ERROR).with_target("stuff"))
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+
+ with_default(subscriber, || {
+ tracing::trace!("this should be disabled");
+ tracing::info!("this shouldn't be");
+ tracing::debug!(target: "stuff", "this should be enabled");
+ tracing::debug!("but this shouldn't");
+ tracing::trace!(target: "stuff", "and neither should this");
+ tracing::warn!(target: "stuff", "this should be enabled");
+ tracing::error!("this should be enabled too");
+ tracing::error!(target: "stuff", "this should be enabled also");
+ });
+
+ finished.assert_finished();
+}
+
+#[test]
+fn not_order_dependent() {
+ // this test reproduces tokio-rs/tracing#623
+
+ let filter: EnvFilter = "stuff=debug,info".parse().expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::DEBUG).with_target("stuff"))
+ .event(event::mock().at_level(Level::WARN).with_target("stuff"))
+ .event(event::mock().at_level(Level::ERROR))
+ .event(event::mock().at_level(Level::ERROR).with_target("stuff"))
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+
+ with_default(subscriber, || {
+ tracing::trace!("this should be disabled");
+ tracing::info!("this shouldn't be");
+ tracing::debug!(target: "stuff", "this should be enabled");
+ tracing::debug!("but this shouldn't");
+ tracing::trace!(target: "stuff", "and neither should this");
+ tracing::warn!(target: "stuff", "this should be enabled");
+ tracing::error!("this should be enabled too");
+ tracing::error!(target: "stuff", "this should be enabled also");
+ });
+
+ finished.assert_finished();
+}
+
+#[test]
+fn add_directive_enables_event() {
+ // this test reproduces tokio-rs/tracing#591
+
+ // by default, use info level
+ let mut filter = EnvFilter::new(LevelFilter::INFO.to_string());
+
+ // overwrite with a more specific directive
+ filter = filter.add_directive("hello=trace".parse().expect("directive should parse"));
+
+ let (subscriber, finished) = subscriber::mock()
+ .event(event::mock().at_level(Level::INFO).with_target("hello"))
+ .event(event::mock().at_level(Level::TRACE).with_target("hello"))
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+
+ with_default(subscriber, || {
+ tracing::info!(target: "hello", "hello info");
+ tracing::trace!(target: "hello", "hello trace");
+ });
+
+ finished.assert_finished();
+}
+
+#[test]
+fn span_name_filter_is_dynamic() {
+ let filter: EnvFilter = "info,[cool_span]=debug"
+ .parse()
+ .expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .event(event::mock().at_level(Level::INFO))
+ .enter(span::mock().named("cool_span"))
+ .event(event::mock().at_level(Level::DEBUG))
+ .enter(span::mock().named("uncool_span"))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::DEBUG))
+ .exit(span::mock().named("uncool_span"))
+ .exit(span::mock().named("cool_span"))
+ .enter(span::mock().named("uncool_span"))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .exit(span::mock().named("uncool_span"))
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+
+ with_default(subscriber, || {
+ tracing::trace!("this should be disabled");
+ tracing::info!("this shouldn't be");
+ let cool_span = tracing::info_span!("cool_span");
+ let uncool_span = tracing::info_span!("uncool_span");
+
+ {
+ let _enter = cool_span.enter();
+ tracing::debug!("i'm a cool event");
+ tracing::trace!("i'm cool, but not cool enough");
+ let _enter2 = uncool_span.enter();
+ tracing::warn!("warning: extremely cool!");
+ tracing::debug!("i'm still cool");
+ }
+
+ let _enter = uncool_span.enter();
+ tracing::warn!("warning: not that cool");
+ tracing::trace!("im not cool enough");
+ tracing::error!("uncool error");
+ });
+
+ finished.assert_finished();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/filter_log.rs b/vendor/tracing-subscriber-0.3.3/tests/filter_log.rs
new file mode 100644
index 000000000..28e742501
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/filter_log.rs
@@ -0,0 +1,63 @@
+#![cfg(all(feature = "env-filter", feature = "tracing-log"))]
+mod support;
+use self::support::*;
+use tracing::{self, Level};
+use tracing_subscriber::{filter::EnvFilter, prelude::*};
+
+mod my_module {
+ pub(crate) fn test_records() {
+ log::trace!("this should be disabled");
+ log::info!("this shouldn't be");
+ log::debug!("this should be disabled");
+ log::warn!("this should be enabled");
+ log::warn!(target: "something else", "this shouldn't be enabled");
+ log::error!("this should be enabled too");
+ }
+
+ pub(crate) fn test_log_enabled() {
+ assert!(
+ log::log_enabled!(log::Level::Info),
+ "info should be enabled inside `my_module`"
+ );
+ assert!(
+ !log::log_enabled!(log::Level::Debug),
+ "debug should not be enabled inside `my_module`"
+ );
+ assert!(
+ log::log_enabled!(log::Level::Warn),
+ "warn should be enabled inside `my_module`"
+ );
+ }
+}
+
+#[test]
+fn log_is_enabled() {
+ let filter: EnvFilter = "filter_log::my_module=info"
+ .parse()
+ .expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle();
+
+ // Note: we have to set the global default in order to set the `log` max
+ // level, which can only be set once.
+ subscriber.with(filter).init();
+
+ my_module::test_records();
+ log::info!("this is disabled");
+
+ my_module::test_log_enabled();
+ assert!(
+ !log::log_enabled!(log::Level::Info),
+ "info should not be enabled outside `my_module`"
+ );
+ assert!(
+ !log::log_enabled!(log::Level::Warn),
+ "warn should not be enabled outside `my_module`"
+ );
+
+ finished.assert_finished();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/fmt_max_level_hint.rs b/vendor/tracing-subscriber-0.3.3/tests/fmt_max_level_hint.rs
new file mode 100644
index 000000000..57a0f6e3f
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/fmt_max_level_hint.rs
@@ -0,0 +1,10 @@
+#![cfg(feature = "fmt")]
+use tracing_subscriber::filter::LevelFilter;
+
+#[test]
+fn fmt_sets_max_level_hint() {
+ tracing_subscriber::fmt()
+ .with_max_level(LevelFilter::DEBUG)
+ .init();
+ assert_eq!(LevelFilter::current(), LevelFilter::DEBUG);
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/hinted_layer_filters_dont_break_other_layers.rs b/vendor/tracing-subscriber-0.3.3/tests/hinted_layer_filters_dont_break_other_layers.rs
new file mode 100644
index 000000000..897dae282
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/hinted_layer_filters_dont_break_other_layers.rs
@@ -0,0 +1,131 @@
+#![cfg(feature = "registry")]
+mod support;
+use self::support::*;
+use tracing::{Level, Metadata, Subscriber};
+use tracing_subscriber::{filter::DynFilterFn, layer::Context, prelude::*};
+
+#[test]
+fn layer_filters() {
+ let (unfiltered, unfiltered_handle) = unfiltered("unfiltered");
+ let (filtered, filtered_handle) = filtered("filtered");
+
+ let subscriber = tracing_subscriber::registry()
+ .with(unfiltered)
+ .with(filtered.with_filter(filter()));
+ assert_eq!(subscriber.max_level_hint(), None);
+ let _subscriber = subscriber.set_default();
+
+ events();
+
+ unfiltered_handle.assert_finished();
+ filtered_handle.assert_finished();
+}
+
+#[test]
+fn layered_layer_filters() {
+ let (unfiltered1, unfiltered1_handle) = unfiltered("unfiltered_1");
+ let (unfiltered2, unfiltered2_handle) = unfiltered("unfiltered_2");
+ let unfiltered = unfiltered1.and_then(unfiltered2);
+
+ let (filtered1, filtered1_handle) = filtered("filtered_1");
+ let (filtered2, filtered2_handle) = filtered("filtered_2");
+ let filtered = filtered1
+ .with_filter(filter())
+ .and_then(filtered2.with_filter(filter()));
+
+ let subscriber = tracing_subscriber::registry()
+ .with(unfiltered)
+ .with(filtered);
+ assert_eq!(subscriber.max_level_hint(), None);
+ let _subscriber = subscriber.set_default();
+
+ events();
+
+ unfiltered1_handle.assert_finished();
+ unfiltered2_handle.assert_finished();
+ filtered1_handle.assert_finished();
+ filtered2_handle.assert_finished();
+}
+
+#[test]
+fn out_of_order() {
+ let (unfiltered1, unfiltered1_handle) = unfiltered("unfiltered_1");
+ let (unfiltered2, unfiltered2_handle) = unfiltered("unfiltered_2");
+
+ let (filtered1, filtered1_handle) = filtered("filtered_1");
+ let (filtered2, filtered2_handle) = filtered("filtered_2");
+
+ let subscriber = tracing_subscriber::registry()
+ .with(unfiltered1)
+ .with(filtered1.with_filter(filter()))
+ .with(unfiltered2)
+ .with(filtered2.with_filter(filter()));
+ assert_eq!(subscriber.max_level_hint(), None);
+ let _subscriber = subscriber.set_default();
+
+ events();
+
+ unfiltered1_handle.assert_finished();
+ unfiltered2_handle.assert_finished();
+ filtered1_handle.assert_finished();
+ filtered2_handle.assert_finished();
+}
+
+#[test]
+fn mixed_layered() {
+ let (unfiltered1, unfiltered1_handle) = unfiltered("unfiltered_1");
+ let (unfiltered2, unfiltered2_handle) = unfiltered("unfiltered_2");
+ let (filtered1, filtered1_handle) = filtered("filtered_1");
+ let (filtered2, filtered2_handle) = filtered("filtered_2");
+
+ let layered1 = filtered1.with_filter(filter()).and_then(unfiltered1);
+ let layered2 = unfiltered2.and_then(filtered2.with_filter(filter()));
+
+ let subscriber = tracing_subscriber::registry().with(layered1).with(layered2);
+ assert_eq!(subscriber.max_level_hint(), None);
+ let _subscriber = subscriber.set_default();
+
+ events();
+
+ unfiltered1_handle.assert_finished();
+ unfiltered2_handle.assert_finished();
+ filtered1_handle.assert_finished();
+ filtered2_handle.assert_finished();
+}
+
+fn events() {
+ tracing::trace!("hello trace");
+ tracing::debug!("hello debug");
+ tracing::info!("hello info");
+ tracing::warn!("hello warn");
+ tracing::error!("hello error");
+}
+
+fn filter<S>() -> DynFilterFn<S> {
+ DynFilterFn::new(
+ (|metadata: &Metadata<'_>, _: &tracing_subscriber::layer::Context<'_, S>| {
+ metadata.level() <= &Level::INFO
+ }) as fn(&Metadata<'_>, &Context<'_, S>) -> bool,
+ )
+ .with_max_level_hint(Level::INFO)
+}
+
+fn unfiltered(name: &str) -> (ExpectLayer, subscriber::MockHandle) {
+ layer::named(name)
+ .event(event::mock().at_level(Level::TRACE))
+ .event(event::mock().at_level(Level::DEBUG))
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle()
+}
+
+fn filtered(name: &str) -> (ExpectLayer, subscriber::MockHandle) {
+ layer::named(name)
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle()
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/layer_filter_interests_are_cached.rs b/vendor/tracing-subscriber-0.3.3/tests/layer_filter_interests_are_cached.rs
new file mode 100644
index 000000000..d89d3bf17
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/layer_filter_interests_are_cached.rs
@@ -0,0 +1,69 @@
+#![cfg(feature = "registry")]
+mod support;
+use self::support::*;
+
+use std::{
+ collections::HashMap,
+ sync::{Arc, Mutex},
+};
+use tracing::{Level, Subscriber};
+use tracing_subscriber::{filter, prelude::*};
+
+#[test]
+fn layer_filter_interests_are_cached() {
+ let seen = Arc::new(Mutex::new(HashMap::new()));
+ let seen2 = seen.clone();
+ let filter = filter::filter_fn(move |meta| {
+ *seen
+ .lock()
+ .unwrap()
+ .entry(meta.callsite())
+ .or_insert(0usize) += 1;
+ meta.level() == &Level::INFO
+ });
+
+ let (expect, handle) = layer::mock()
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::INFO))
+ .done()
+ .run_with_handle();
+
+ let subscriber = tracing_subscriber::registry().with(expect.with_filter(filter));
+ assert!(subscriber.max_level_hint().is_none());
+
+ let _subscriber = subscriber.set_default();
+
+ fn events() {
+ tracing::trace!("hello trace");
+ tracing::debug!("hello debug");
+ tracing::info!("hello info");
+ tracing::warn!("hello warn");
+ tracing::error!("hello error");
+ }
+
+ events();
+ {
+ let lock = seen2.lock().unwrap();
+ for (callsite, &count) in lock.iter() {
+ assert_eq!(
+ count, 1,
+ "callsite {:?} should have been seen 1 time (after first set of events)",
+ callsite
+ );
+ }
+ }
+
+ events();
+ {
+ let lock = seen2.lock().unwrap();
+ for (callsite, &count) in lock.iter() {
+ assert_eq!(
+ count, 1,
+ "callsite {:?} should have been seen 1 time (after second set of events)",
+ callsite
+ );
+ }
+ }
+
+ handle.assert_finished();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/layer_filters/boxed.rs b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/boxed.rs
new file mode 100644
index 000000000..0fe37188e
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/boxed.rs
@@ -0,0 +1,42 @@
+use super::*;
+use tracing_subscriber::{filter, prelude::*, Layer};
+
+fn layer() -> (ExpectLayer, subscriber::MockHandle) {
+ layer::mock().done().run_with_handle()
+}
+
+fn filter<S>() -> filter::DynFilterFn<S> {
+ // Use dynamic filter fn to disable interest caching and max-level hints,
+ // allowing us to put all of these tests in the same file.
+ filter::dynamic_filter_fn(|_, _| false)
+}
+
+/// reproduces https://github.com/tokio-rs/tracing/issues/1563#issuecomment-921363629
+#[test]
+fn box_works() {
+ let (layer, handle) = layer();
+ let layer = Box::new(layer.with_filter(filter()));
+
+ let _guard = tracing_subscriber::registry().with(layer).set_default();
+
+ for i in 0..2 {
+ tracing::info!(i);
+ }
+
+ handle.assert_finished();
+}
+
+/// the same as `box_works` but with a type-erased `Box`.
+#[test]
+fn dyn_box_works() {
+ let (layer, handle) = layer();
+ let layer: Box<dyn Layer<_> + Send + Sync + 'static> = Box::new(layer.with_filter(filter()));
+
+ let _guard = tracing_subscriber::registry().with(layer).set_default();
+
+ for i in 0..2 {
+ tracing::info!(i);
+ }
+
+ handle.assert_finished();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/layer_filters/downcast_raw.rs b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/downcast_raw.rs
new file mode 100644
index 000000000..b5f7e35ce
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/downcast_raw.rs
@@ -0,0 +1,68 @@
+use tracing::Subscriber;
+use tracing_subscriber::filter::Targets;
+use tracing_subscriber::prelude::*;
+use tracing_subscriber::Layer;
+
+#[test]
+fn downcast_ref_to_inner_layer_and_filter() {
+ // Test that a filtered layer gives downcast_ref access to
+ // both the layer and the filter.
+
+ struct WrappedLayer;
+
+ impl<S> Layer<S> for WrappedLayer
+ where
+ S: Subscriber,
+ S: for<'lookup> tracing_subscriber::registry::LookupSpan<'lookup>,
+ {
+ }
+
+ let layer = WrappedLayer;
+ let filter = Targets::new().with_default(tracing::Level::INFO);
+ let registry = tracing_subscriber::registry().with(layer.with_filter(filter));
+ let dispatch = tracing::dispatcher::Dispatch::new(registry);
+
+ // The filter is available
+ assert!(dispatch.downcast_ref::<Targets>().is_some());
+ // The wrapped layer is available
+ assert!(dispatch.downcast_ref::<WrappedLayer>().is_some());
+}
+
+#[test]
+fn forward_downcast_raw_to_layer() {
+ // Test that a filtered layer still gives its wrapped layer a chance to
+ // return a custom struct from downcast_raw.
+ // https://github.com/tokio-rs/tracing/issues/1618
+
+ struct WrappedLayer {
+ with_context: WithContext,
+ }
+
+ struct WithContext;
+
+ impl<S> Layer<S> for WrappedLayer
+ where
+ S: Subscriber,
+ S: for<'lookup> tracing_subscriber::registry::LookupSpan<'lookup>,
+ {
+ unsafe fn downcast_raw(&self, id: std::any::TypeId) -> Option<*const ()> {
+ match id {
+ id if id == std::any::TypeId::of::<Self>() => Some(self as *const _ as *const ()),
+ id if id == std::any::TypeId::of::<WithContext>() => {
+ Some(&self.with_context as *const _ as *const ())
+ }
+ _ => None,
+ }
+ }
+ }
+
+ let layer = WrappedLayer {
+ with_context: WithContext,
+ };
+ let filter = Targets::new().with_default(tracing::Level::INFO);
+ let registry = tracing_subscriber::registry().with(layer.with_filter(filter));
+ let dispatch = tracing::dispatcher::Dispatch::new(registry);
+
+ // Types from a custom implementation of `downcast_raw` are available
+ assert!(dispatch.downcast_ref::<WithContext>().is_some());
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/layer_filters/filter_scopes.rs b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/filter_scopes.rs
new file mode 100644
index 000000000..7fd7d843b
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/filter_scopes.rs
@@ -0,0 +1,131 @@
+use super::*;
+
+#[test]
+fn filters_span_scopes() {
+ let (debug_layer, debug_handle) = layer::named("debug")
+ .enter(span::mock().at_level(Level::DEBUG))
+ .enter(span::mock().at_level(Level::INFO))
+ .enter(span::mock().at_level(Level::WARN))
+ .enter(span::mock().at_level(Level::ERROR))
+ .event(event::msg("hello world").in_scope(vec![
+ span::mock().at_level(Level::ERROR),
+ span::mock().at_level(Level::WARN),
+ span::mock().at_level(Level::INFO),
+ span::mock().at_level(Level::DEBUG),
+ ]))
+ .exit(span::mock().at_level(Level::ERROR))
+ .exit(span::mock().at_level(Level::WARN))
+ .exit(span::mock().at_level(Level::INFO))
+ .exit(span::mock().at_level(Level::DEBUG))
+ .done()
+ .run_with_handle();
+ let (info_layer, info_handle) = layer::named("info")
+ .enter(span::mock().at_level(Level::INFO))
+ .enter(span::mock().at_level(Level::WARN))
+ .enter(span::mock().at_level(Level::ERROR))
+ .event(event::msg("hello world").in_scope(vec![
+ span::mock().at_level(Level::ERROR),
+ span::mock().at_level(Level::WARN),
+ span::mock().at_level(Level::INFO),
+ ]))
+ .exit(span::mock().at_level(Level::ERROR))
+ .exit(span::mock().at_level(Level::WARN))
+ .exit(span::mock().at_level(Level::INFO))
+ .done()
+ .run_with_handle();
+ let (warn_layer, warn_handle) = layer::named("warn")
+ .enter(span::mock().at_level(Level::WARN))
+ .enter(span::mock().at_level(Level::ERROR))
+ .event(event::msg("hello world").in_scope(vec![
+ span::mock().at_level(Level::ERROR),
+ span::mock().at_level(Level::WARN),
+ ]))
+ .exit(span::mock().at_level(Level::ERROR))
+ .exit(span::mock().at_level(Level::WARN))
+ .done()
+ .run_with_handle();
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(debug_layer.with_filter(LevelFilter::DEBUG))
+ .with(info_layer.with_filter(LevelFilter::INFO))
+ .with(warn_layer.with_filter(LevelFilter::WARN))
+ .set_default();
+
+ {
+ let _trace = tracing::trace_span!("my_span").entered();
+ let _debug = tracing::debug_span!("my_span").entered();
+ let _info = tracing::info_span!("my_span").entered();
+ let _warn = tracing::warn_span!("my_span").entered();
+ let _error = tracing::error_span!("my_span").entered();
+ tracing::error!("hello world");
+ }
+
+ debug_handle.assert_finished();
+ info_handle.assert_finished();
+ warn_handle.assert_finished();
+}
+
+#[test]
+fn filters_interleaved_span_scopes() {
+ fn target_layer(target: &'static str) -> (ExpectLayer, subscriber::MockHandle) {
+ layer::named(format!("target_{}", target))
+ .enter(span::mock().with_target(target))
+ .enter(span::mock().with_target(target))
+ .event(event::msg("hello world").in_scope(vec![
+ span::mock().with_target(target),
+ span::mock().with_target(target),
+ ]))
+ .event(
+ event::msg("hello to my target")
+ .in_scope(vec![
+ span::mock().with_target(target),
+ span::mock().with_target(target),
+ ])
+ .with_target(target),
+ )
+ .exit(span::mock().with_target(target))
+ .exit(span::mock().with_target(target))
+ .done()
+ .run_with_handle()
+ }
+
+ let (a_layer, a_handle) = target_layer("a");
+ let (b_layer, b_handle) = target_layer("b");
+ let (all_layer, all_handle) = layer::named("all")
+ .enter(span::mock().with_target("b"))
+ .enter(span::mock().with_target("a"))
+ .event(event::msg("hello world").in_scope(vec![
+ span::mock().with_target("a"),
+ span::mock().with_target("b"),
+ ]))
+ .exit(span::mock().with_target("a"))
+ .exit(span::mock().with_target("b"))
+ .done()
+ .run_with_handle();
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(all_layer.with_filter(LevelFilter::INFO))
+ .with(a_layer.with_filter(filter::filter_fn(|meta| {
+ let target = meta.target();
+ target == "a" || target == module_path!()
+ })))
+ .with(b_layer.with_filter(filter::filter_fn(|meta| {
+ let target = meta.target();
+ target == "b" || target == module_path!()
+ })))
+ .set_default();
+
+ {
+ let _a1 = tracing::trace_span!(target: "a", "a/trace").entered();
+ let _b1 = tracing::info_span!(target: "b", "b/info").entered();
+ let _a2 = tracing::info_span!(target: "a", "a/info").entered();
+ let _b2 = tracing::trace_span!(target: "b", "b/trace").entered();
+ tracing::info!("hello world");
+ tracing::debug!(target: "a", "hello to my target");
+ tracing::debug!(target: "b", "hello to my target");
+ }
+
+ a_handle.assert_finished();
+ b_handle.assert_finished();
+ all_handle.assert_finished();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/layer_filters/main.rs b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/main.rs
new file mode 100644
index 000000000..2359584d7
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/main.rs
@@ -0,0 +1,188 @@
+#![cfg(feature = "registry")]
+#[path = "../support.rs"]
+mod support;
+use self::support::*;
+mod boxed;
+mod downcast_raw;
+mod filter_scopes;
+mod targets;
+mod trees;
+
+use tracing::{level_filters::LevelFilter, Level};
+use tracing_subscriber::{filter, prelude::*};
+
+#[test]
+fn basic_layer_filters() {
+ let (trace_layer, trace_handle) = layer::named("trace")
+ .event(event::mock().at_level(Level::TRACE))
+ .event(event::mock().at_level(Level::DEBUG))
+ .event(event::mock().at_level(Level::INFO))
+ .done()
+ .run_with_handle();
+
+ let (debug_layer, debug_handle) = layer::named("debug")
+ .event(event::mock().at_level(Level::DEBUG))
+ .event(event::mock().at_level(Level::INFO))
+ .done()
+ .run_with_handle();
+
+ let (info_layer, info_handle) = layer::named("info")
+ .event(event::mock().at_level(Level::INFO))
+ .done()
+ .run_with_handle();
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(trace_layer.with_filter(LevelFilter::TRACE))
+ .with(debug_layer.with_filter(LevelFilter::DEBUG))
+ .with(info_layer.with_filter(LevelFilter::INFO))
+ .set_default();
+
+ tracing::trace!("hello trace");
+ tracing::debug!("hello debug");
+ tracing::info!("hello info");
+
+ trace_handle.assert_finished();
+ debug_handle.assert_finished();
+ info_handle.assert_finished();
+}
+
+#[test]
+fn basic_layer_filters_spans() {
+ let (trace_layer, trace_handle) = layer::named("trace")
+ .new_span(span::mock().at_level(Level::TRACE))
+ .new_span(span::mock().at_level(Level::DEBUG))
+ .new_span(span::mock().at_level(Level::INFO))
+ .done()
+ .run_with_handle();
+
+ let (debug_layer, debug_handle) = layer::named("debug")
+ .new_span(span::mock().at_level(Level::DEBUG))
+ .new_span(span::mock().at_level(Level::INFO))
+ .done()
+ .run_with_handle();
+
+ let (info_layer, info_handle) = layer::named("info")
+ .new_span(span::mock().at_level(Level::INFO))
+ .done()
+ .run_with_handle();
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(trace_layer.with_filter(LevelFilter::TRACE))
+ .with(debug_layer.with_filter(LevelFilter::DEBUG))
+ .with(info_layer.with_filter(LevelFilter::INFO))
+ .set_default();
+
+ tracing::trace_span!("hello trace");
+ tracing::debug_span!("hello debug");
+ tracing::info_span!("hello info");
+
+ trace_handle.assert_finished();
+ debug_handle.assert_finished();
+ info_handle.assert_finished();
+}
+
+#[test]
+fn global_filters_layers_still_work() {
+ let (expect, handle) = layer::mock()
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle();
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(expect)
+ .with(LevelFilter::INFO)
+ .set_default();
+
+ tracing::trace!("hello trace");
+ tracing::debug!("hello debug");
+ tracing::info!("hello info");
+ tracing::warn!("hello warn");
+ tracing::error!("hello error");
+
+ handle.assert_finished();
+}
+
+#[test]
+fn global_filter_interests_are_cached() {
+ let (expect, handle) = layer::mock()
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle();
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(expect.with_filter(filter::filter_fn(|meta| {
+ assert!(
+ meta.level() <= &Level::INFO,
+ "enabled should not be called for callsites disabled by the global filter"
+ );
+ meta.level() <= &Level::WARN
+ })))
+ .with(LevelFilter::INFO)
+ .set_default();
+
+ tracing::trace!("hello trace");
+ tracing::debug!("hello debug");
+ tracing::info!("hello info");
+ tracing::warn!("hello warn");
+ tracing::error!("hello error");
+
+ handle.assert_finished();
+}
+
+#[test]
+fn global_filters_affect_layer_filters() {
+ let (expect, handle) = layer::named("debug")
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle();
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(expect.with_filter(LevelFilter::DEBUG))
+ .with(LevelFilter::INFO)
+ .set_default();
+
+ tracing::trace!("hello trace");
+ tracing::debug!("hello debug");
+ tracing::info!("hello info");
+ tracing::warn!("hello warn");
+ tracing::error!("hello error");
+
+ handle.assert_finished();
+}
+
+#[test]
+fn filter_fn() {
+ let (all, all_handle) = layer::named("all_targets")
+ .event(event::msg("hello foo"))
+ .event(event::msg("hello bar"))
+ .done()
+ .run_with_handle();
+
+ let (foo, foo_handle) = layer::named("foo_target")
+ .event(event::msg("hello foo"))
+ .done()
+ .run_with_handle();
+
+ let (bar, bar_handle) = layer::named("bar_target")
+ .event(event::msg("hello bar"))
+ .done()
+ .run_with_handle();
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(all)
+ .with(foo.with_filter(filter::filter_fn(|meta| meta.target().starts_with("foo"))))
+ .with(bar.with_filter(filter::filter_fn(|meta| meta.target().starts_with("bar"))))
+ .set_default();
+
+ tracing::trace!(target: "foo", "hello foo");
+ tracing::trace!(target: "bar", "hello bar");
+
+ foo_handle.assert_finished();
+ bar_handle.assert_finished();
+ all_handle.assert_finished();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/layer_filters/targets.rs b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/targets.rs
new file mode 100644
index 000000000..c8133044b
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/targets.rs
@@ -0,0 +1,59 @@
+use super::*;
+use tracing_subscriber::{
+ filter::{filter_fn, Targets},
+ prelude::*,
+};
+
+#[test]
+#[cfg_attr(not(feature = "tracing-log"), ignore)]
+fn log_events() {
+ // Reproduces https://github.com/tokio-rs/tracing/issues/1563
+ mod inner {
+ pub(super) const MODULE_PATH: &str = module_path!();
+
+ #[tracing::instrument]
+ pub(super) fn logs() {
+ log::debug!("inner");
+ }
+ }
+
+ let filter = Targets::new()
+ .with_default(LevelFilter::DEBUG)
+ .with_target(inner::MODULE_PATH, LevelFilter::WARN);
+
+ let layer =
+ tracing_subscriber::layer::Identity::new().with_filter(filter_fn(move |_meta| true));
+
+ let _guard = tracing_subscriber::registry()
+ .with(filter)
+ .with(layer)
+ .set_default();
+
+ inner::logs();
+}
+
+#[test]
+fn inner_layer_short_circuits() {
+ // This test ensures that when a global filter short-circuits `Interest`
+ // evaluation, we aren't left with a "dirty" per-layer filter state.
+
+ let (layer, handle) = layer::mock()
+ .event(event::msg("hello world"))
+ .done()
+ .run_with_handle();
+
+ let filter = Targets::new().with_target("magic_target", LevelFilter::DEBUG);
+
+ let _guard = tracing_subscriber::registry()
+ // Note: we don't just use a `LevelFilter` for the global filter here,
+ // because it will just return a max level filter, and the chain of
+ // `register_callsite` calls that would trigger the bug never happens...
+ .with(filter::filter_fn(|meta| meta.level() <= &Level::INFO))
+ .with(layer.with_filter(filter))
+ .set_default();
+
+ tracing::debug!("skip me please!");
+ tracing::info!(target: "magic_target", "hello world");
+
+ handle.assert_finished();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/layer_filters/trees.rs b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/trees.rs
new file mode 100644
index 000000000..18cdd8ccc
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/layer_filters/trees.rs
@@ -0,0 +1,146 @@
+use super::*;
+
+#[test]
+fn basic_trees() {
+ let (with_target, with_target_handle) = layer::named("info_with_target")
+ .event(event::mock().at_level(Level::INFO).with_target("my_target"))
+ .done()
+ .run_with_handle();
+
+ let (info, info_handle) = layer::named("info")
+ .event(
+ event::mock()
+ .at_level(Level::INFO)
+ .with_target(module_path!()),
+ )
+ .event(event::mock().at_level(Level::INFO).with_target("my_target"))
+ .done()
+ .run_with_handle();
+
+ let (all, all_handle) = layer::named("all")
+ .event(
+ event::mock()
+ .at_level(Level::INFO)
+ .with_target(module_path!()),
+ )
+ .event(event::mock().at_level(Level::TRACE))
+ .event(event::mock().at_level(Level::INFO).with_target("my_target"))
+ .event(
+ event::mock()
+ .at_level(Level::TRACE)
+ .with_target("my_target"),
+ )
+ .done()
+ .run_with_handle();
+
+ let info_tree = info
+ .and_then(
+ with_target.with_filter(filter::filter_fn(|meta| dbg!(meta.target()) == "my_target")),
+ )
+ .with_filter(LevelFilter::INFO);
+
+ let subscriber = tracing_subscriber::registry().with(info_tree).with(all);
+ let _guard = dbg!(subscriber).set_default();
+
+ tracing::info!("hello world");
+ tracing::trace!("hello trace");
+ tracing::info!(target: "my_target", "hi to my target");
+ tracing::trace!(target: "my_target", "hi to my target at trace");
+
+ all_handle.assert_finished();
+ info_handle.assert_finished();
+ with_target_handle.assert_finished();
+}
+
+#[test]
+fn filter_span_scopes() {
+ fn target_layer(target: &'static str) -> (ExpectLayer, subscriber::MockHandle) {
+ layer::named(format!("target_{}", target))
+ .enter(span::mock().with_target(target).at_level(Level::INFO))
+ .event(
+ event::msg("hello world")
+ .in_scope(vec![span::mock().with_target(target).at_level(Level::INFO)]),
+ )
+ .exit(span::mock().with_target(target).at_level(Level::INFO))
+ .done()
+ .run_with_handle()
+ }
+
+ let (a_layer, a_handle) = target_layer("a");
+ let (b_layer, b_handle) = target_layer("b");
+ let (info_layer, info_handle) = layer::named("info")
+ .enter(span::mock().with_target("b").at_level(Level::INFO))
+ .enter(span::mock().with_target("a").at_level(Level::INFO))
+ .event(event::msg("hello world").in_scope(vec![
+ span::mock().with_target("a").at_level(Level::INFO),
+ span::mock().with_target("b").at_level(Level::INFO),
+ ]))
+ .exit(span::mock().with_target("a").at_level(Level::INFO))
+ .exit(span::mock().with_target("b").at_level(Level::INFO))
+ .done()
+ .run_with_handle();
+
+ let full_scope = vec![
+ span::mock().with_target("b").at_level(Level::TRACE),
+ span::mock().with_target("a").at_level(Level::INFO),
+ span::mock().with_target("b").at_level(Level::INFO),
+ span::mock().with_target("a").at_level(Level::TRACE),
+ ];
+ let (all_layer, all_handle) = layer::named("all")
+ .enter(span::mock().with_target("a").at_level(Level::TRACE))
+ .enter(span::mock().with_target("b").at_level(Level::INFO))
+ .enter(span::mock().with_target("a").at_level(Level::INFO))
+ .enter(span::mock().with_target("b").at_level(Level::TRACE))
+ .event(event::msg("hello world").in_scope(full_scope.clone()))
+ .event(
+ event::msg("hello to my target")
+ .with_target("a")
+ .in_scope(full_scope.clone()),
+ )
+ .event(
+ event::msg("hello to my target")
+ .with_target("b")
+ .in_scope(full_scope),
+ )
+ .exit(span::mock().with_target("b").at_level(Level::TRACE))
+ .exit(span::mock().with_target("a").at_level(Level::INFO))
+ .exit(span::mock().with_target("b").at_level(Level::INFO))
+ .exit(span::mock().with_target("a").at_level(Level::TRACE))
+ .done()
+ .run_with_handle();
+
+ let a_layer = a_layer.with_filter(filter::filter_fn(|meta| {
+ let target = meta.target();
+ target == "a" || target == module_path!()
+ }));
+
+ let b_layer = b_layer.with_filter(filter::filter_fn(|meta| {
+ let target = meta.target();
+ target == "b" || target == module_path!()
+ }));
+
+ let info_tree = info_layer
+ .and_then(a_layer)
+ .and_then(b_layer)
+ .with_filter(LevelFilter::INFO);
+
+ let subscriber = tracing_subscriber::registry()
+ .with(info_tree)
+ .with(all_layer);
+ let _guard = dbg!(subscriber).set_default();
+
+ {
+ let _a1 = tracing::trace_span!(target: "a", "a/trace").entered();
+ let _b1 = tracing::info_span!(target: "b", "b/info").entered();
+ let _a2 = tracing::info_span!(target: "a", "a/info").entered();
+ let _b2 = tracing::trace_span!(target: "b", "b/trace").entered();
+ tracing::info!("hello world");
+ tracing::debug!(target: "a", "hello to my target");
+ tracing::debug!(target: "b", "hello to my target");
+ }
+
+ all_handle.assert_finished();
+ info_handle.assert_finished();
+ a_handle.assert_finished();
+ b_handle.assert_finished();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/multiple_layer_filter_interests_cached.rs b/vendor/tracing-subscriber-0.3.3/tests/multiple_layer_filter_interests_cached.rs
new file mode 100644
index 000000000..5c25e7f03
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/multiple_layer_filter_interests_cached.rs
@@ -0,0 +1,131 @@
+#![cfg(feature = "registry")]
+mod support;
+use self::support::*;
+
+use std::{
+ collections::HashMap,
+ sync::{Arc, Mutex},
+};
+use tracing::{Level, Subscriber};
+use tracing_subscriber::{filter, prelude::*};
+
+#[test]
+fn multiple_layer_filter_interests_are_cached() {
+ // This layer will return Interest::always for INFO and lower.
+ let seen_info = Arc::new(Mutex::new(HashMap::new()));
+ let seen_info2 = seen_info.clone();
+ let filter = filter::filter_fn(move |meta| {
+ *seen_info
+ .lock()
+ .unwrap()
+ .entry(*meta.level())
+ .or_insert(0usize) += 1;
+ meta.level() <= &Level::INFO
+ });
+ let seen_info = seen_info2;
+
+ let (info_layer, info_handle) = layer::named("info")
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle();
+ let info_layer = info_layer.with_filter(filter);
+
+ // This layer will return Interest::always for WARN and lower.
+ let seen_warn = Arc::new(Mutex::new(HashMap::new()));
+ let seen_warn2 = seen_warn.clone();
+ let filter = filter::filter_fn(move |meta| {
+ *seen_warn
+ .lock()
+ .unwrap()
+ .entry(*meta.level())
+ .or_insert(0usize) += 1;
+ meta.level() <= &Level::WARN
+ });
+ let seen_warn = seen_warn2;
+
+ let (warn_layer, warn_handle) = layer::named("warn")
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle();
+ let warn_layer = warn_layer.with_filter(filter);
+
+ let subscriber = tracing_subscriber::registry()
+ .with(warn_layer)
+ .with(info_layer);
+ assert!(subscriber.max_level_hint().is_none());
+
+ let _subscriber = subscriber.set_default();
+
+ fn events() {
+ tracing::trace!("hello trace");
+ tracing::debug!("hello debug");
+ tracing::info!("hello info");
+ tracing::warn!("hello warn");
+ tracing::error!("hello error");
+ }
+
+ events();
+ {
+ let lock = seen_info.lock().unwrap();
+ for (&level, &count) in lock.iter() {
+ if level == Level::INFO {
+ continue;
+ }
+ assert_eq!(
+ count, 1,
+ "level {:?} should have been seen 1 time by the INFO layer (after first set of events)",
+ level
+ );
+ }
+
+ let lock = seen_warn.lock().unwrap();
+ for (&level, &count) in lock.iter() {
+ if level == Level::INFO {
+ continue;
+ }
+ assert_eq!(
+ count, 1,
+ "level {:?} should have been seen 1 time by the WARN layer (after first set of events)",
+ level
+ );
+ }
+ }
+
+ events();
+ {
+ let lock = seen_info.lock().unwrap();
+ for (&level, &count) in lock.iter() {
+ if level == Level::INFO {
+ continue;
+ }
+ assert_eq!(
+ count, 1,
+ "level {:?} should have been seen 1 time by the INFO layer (after second set of events)",
+ level
+ );
+ }
+
+ let lock = seen_warn.lock().unwrap();
+ for (&level, &count) in lock.iter() {
+ if level == Level::INFO {
+ continue;
+ }
+ assert_eq!(
+ count, 1,
+ "level {:?} should have been seen 1 time by the WARN layer (after second set of events)",
+ level
+ );
+ }
+ }
+
+ info_handle.assert_finished();
+ warn_handle.assert_finished();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/registry_max_level_hint.rs b/vendor/tracing-subscriber-0.3.3/tests/registry_max_level_hint.rs
new file mode 100644
index 000000000..f94c8a1fb
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/registry_max_level_hint.rs
@@ -0,0 +1,11 @@
+#![cfg(all(feature = "registry", feature = "fmt"))]
+use tracing_subscriber::{filter::LevelFilter, prelude::*};
+
+#[test]
+fn registry_sets_max_level_hint() {
+ tracing_subscriber::registry()
+ .with(tracing_subscriber::fmt::layer())
+ .with(LevelFilter::DEBUG)
+ .init();
+ assert_eq!(LevelFilter::current(), LevelFilter::DEBUG);
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/registry_with_subscriber.rs b/vendor/tracing-subscriber-0.3.3/tests/registry_with_subscriber.rs
new file mode 100644
index 000000000..3f8d99b1d
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/registry_with_subscriber.rs
@@ -0,0 +1,25 @@
+#![cfg(feature = "registry")]
+use tracing_futures::{Instrument, WithSubscriber};
+use tracing_subscriber::prelude::*;
+
+#[tokio::test]
+async fn future_with_subscriber() {
+ let _default = tracing_subscriber::registry().init();
+ let span = tracing::info_span!("foo");
+ let _e = span.enter();
+ let span = tracing::info_span!("bar");
+ let _e = span.enter();
+ tokio::spawn(
+ async {
+ async {
+ let span = tracing::Span::current();
+ println!("{:?}", span);
+ }
+ .instrument(tracing::info_span!("hi"))
+ .await
+ }
+ .with_subscriber(tracing_subscriber::registry()),
+ )
+ .await
+ .unwrap();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/reload.rs b/vendor/tracing-subscriber-0.3.3/tests/reload.rs
new file mode 100644
index 000000000..5fe422e08
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/reload.rs
@@ -0,0 +1,81 @@
+#![cfg(feature = "reload")]
+use std::sync::atomic::{AtomicUsize, Ordering};
+use tracing_core::{
+ span::{Attributes, Id, Record},
+ subscriber::Interest,
+ Event, Metadata, Subscriber,
+};
+use tracing_subscriber::{layer, prelude::*, reload::*};
+
+pub struct NopSubscriber;
+
+impl Subscriber for NopSubscriber {
+ fn register_callsite(&self, _: &'static Metadata<'static>) -> Interest {
+ Interest::never()
+ }
+
+ fn enabled(&self, _: &Metadata<'_>) -> bool {
+ false
+ }
+
+ fn new_span(&self, _: &Attributes<'_>) -> Id {
+ Id::from_u64(1)
+ }
+
+ fn record(&self, _: &Id, _: &Record<'_>) {}
+ fn record_follows_from(&self, _: &Id, _: &Id) {}
+ fn event(&self, _: &Event<'_>) {}
+ fn enter(&self, _: &Id) {}
+ fn exit(&self, _: &Id) {}
+}
+
+#[test]
+fn reload_handle() {
+ static FILTER1_CALLS: AtomicUsize = AtomicUsize::new(0);
+ static FILTER2_CALLS: AtomicUsize = AtomicUsize::new(0);
+
+ enum Filter {
+ One,
+ Two,
+ }
+
+ impl<S: Subscriber> tracing_subscriber::Layer<S> for Filter {
+ fn register_callsite(&self, m: &Metadata<'_>) -> Interest {
+ println!("REGISTER: {:?}", m);
+ Interest::sometimes()
+ }
+
+ fn enabled(&self, m: &Metadata<'_>, _: layer::Context<'_, S>) -> bool {
+ println!("ENABLED: {:?}", m);
+ match self {
+ Filter::One => FILTER1_CALLS.fetch_add(1, Ordering::SeqCst),
+ Filter::Two => FILTER2_CALLS.fetch_add(1, Ordering::SeqCst),
+ };
+ true
+ }
+ }
+ fn event() {
+ tracing::trace!("my event");
+ }
+
+ let (layer, handle) = Layer::new(Filter::One);
+
+ let subscriber = tracing_core::dispatcher::Dispatch::new(layer.with_subscriber(NopSubscriber));
+
+ tracing_core::dispatcher::with_default(&subscriber, || {
+ assert_eq!(FILTER1_CALLS.load(Ordering::SeqCst), 0);
+ assert_eq!(FILTER2_CALLS.load(Ordering::SeqCst), 0);
+
+ event();
+
+ assert_eq!(FILTER1_CALLS.load(Ordering::SeqCst), 1);
+ assert_eq!(FILTER2_CALLS.load(Ordering::SeqCst), 0);
+
+ handle.reload(Filter::Two).expect("should reload");
+
+ event();
+
+ assert_eq!(FILTER1_CALLS.load(Ordering::SeqCst), 1);
+ assert_eq!(FILTER2_CALLS.load(Ordering::SeqCst), 1);
+ })
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/same_len_filters.rs b/vendor/tracing-subscriber-0.3.3/tests/same_len_filters.rs
new file mode 100644
index 000000000..b525ea6fd
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/same_len_filters.rs
@@ -0,0 +1,81 @@
+// These tests include field filters with no targets, so they have to go in a
+// separate file.
+#![cfg(feature = "env-filter")]
+mod support;
+use self::support::*;
+use tracing::{self, subscriber::with_default, Level};
+use tracing_subscriber::{filter::EnvFilter, prelude::*};
+
+#[test]
+fn same_length_targets() {
+ let filter: EnvFilter = "foo=trace,bar=trace".parse().expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .event(event::mock().at_level(Level::TRACE))
+ .event(event::mock().at_level(Level::TRACE))
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+
+ with_default(subscriber, || {
+ tracing::trace!(target: "foo", "foo");
+ tracing::trace!(target: "bar", "bar");
+ });
+
+ finished.assert_finished();
+}
+
+#[test]
+fn same_num_fields_event() {
+ let filter: EnvFilter = "[{foo}]=trace,[{bar}]=trace"
+ .parse()
+ .expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .event(
+ event::mock()
+ .at_level(Level::TRACE)
+ .with_fields(field::mock("foo")),
+ )
+ .event(
+ event::mock()
+ .at_level(Level::TRACE)
+ .with_fields(field::mock("bar")),
+ )
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+ with_default(subscriber, || {
+ tracing::trace!(foo = 1);
+ tracing::trace!(bar = 3);
+ });
+
+ finished.assert_finished();
+}
+
+#[test]
+fn same_num_fields_and_name_len() {
+ let filter: EnvFilter = "[foo{bar=1}]=trace,[baz{boz=1}]=trace"
+ .parse()
+ .expect("filter should parse");
+ let (subscriber, finished) = subscriber::mock()
+ .new_span(
+ span::mock()
+ .named("foo")
+ .at_level(Level::TRACE)
+ .with_field(field::mock("bar")),
+ )
+ .new_span(
+ span::mock()
+ .named("baz")
+ .at_level(Level::TRACE)
+ .with_field(field::mock("boz")),
+ )
+ .done()
+ .run_with_handle();
+ let subscriber = subscriber.with(filter);
+ with_default(subscriber, || {
+ tracing::trace_span!("foo", bar = 1);
+ tracing::trace_span!("baz", boz = 1);
+ });
+
+ finished.assert_finished();
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/support.rs b/vendor/tracing-subscriber-0.3.3/tests/support.rs
new file mode 100644
index 000000000..848ebdc63
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/support.rs
@@ -0,0 +1,412 @@
+#![allow(missing_docs, dead_code)]
+pub use self::support::{event, field, span, subscriber};
+// This has to have the same name as the module in `tracing`.
+// path attribute requires referenced module to have same name so allow module inception here
+#[allow(clippy::module_inception)]
+#[path = "../../tracing/tests/support/mod.rs"]
+mod support;
+
+use self::{
+ event::MockEvent,
+ span::{MockSpan, NewSpan},
+ subscriber::{Expect, MockHandle},
+};
+use tracing_core::{
+ span::{Attributes, Id, Record},
+ Event, Subscriber,
+};
+use tracing_subscriber::{
+ layer::{Context, Layer},
+ registry::{LookupSpan, SpanRef},
+};
+
+use std::{
+ collections::VecDeque,
+ fmt,
+ sync::{Arc, Mutex},
+};
+
+pub mod layer {
+ use super::ExpectLayerBuilder;
+
+ pub fn mock() -> ExpectLayerBuilder {
+ ExpectLayerBuilder {
+ expected: Default::default(),
+ name: std::thread::current()
+ .name()
+ .map(String::from)
+ .unwrap_or_default(),
+ }
+ }
+
+ pub fn named(name: impl std::fmt::Display) -> ExpectLayerBuilder {
+ mock().named(name)
+ }
+}
+
+pub struct ExpectLayerBuilder {
+ expected: VecDeque<Expect>,
+ name: String,
+}
+
+pub struct ExpectLayer {
+ expected: Arc<Mutex<VecDeque<Expect>>>,
+ current: Mutex<Vec<Id>>,
+ name: String,
+}
+
+impl ExpectLayerBuilder {
+ /// Overrides the name printed by the mock subscriber's debugging output.
+ ///
+ /// The debugging output is displayed if the test panics, or if the test is
+ /// run with `--nocapture`.
+ ///
+ /// By default, the mock subscriber's name is the name of the test
+ /// (*technically*, the name of the thread where it was created, which is
+ /// the name of the test unless tests are run with `--test-threads=1`).
+ /// When a test has only one mock subscriber, this is sufficient. However,
+ /// some tests may include multiple subscribers, in order to test
+ /// interactions between multiple subscribers. In that case, it can be
+ /// helpful to give each subscriber a separate name to distinguish where the
+ /// debugging output comes from.
+ pub fn named(mut self, name: impl fmt::Display) -> Self {
+ use std::fmt::Write;
+ if !self.name.is_empty() {
+ write!(&mut self.name, "::{}", name).unwrap();
+ } else {
+ self.name = name.to_string();
+ }
+ self
+ }
+
+ pub fn enter(mut self, span: MockSpan) -> Self {
+ self.expected.push_back(Expect::Enter(span));
+ self
+ }
+
+ pub fn event(mut self, event: MockEvent) -> Self {
+ self.expected.push_back(Expect::Event(event));
+ self
+ }
+
+ pub fn exit(mut self, span: MockSpan) -> Self {
+ self.expected.push_back(Expect::Exit(span));
+ self
+ }
+
+ pub fn done(mut self) -> Self {
+ self.expected.push_back(Expect::Nothing);
+ self
+ }
+
+ pub fn record<I>(mut self, span: MockSpan, fields: I) -> Self
+ where
+ I: Into<field::Expect>,
+ {
+ self.expected.push_back(Expect::Visit(span, fields.into()));
+ self
+ }
+
+ pub fn new_span<I>(mut self, new_span: I) -> Self
+ where
+ I: Into<NewSpan>,
+ {
+ self.expected.push_back(Expect::NewSpan(new_span.into()));
+ self
+ }
+
+ pub fn run(self) -> ExpectLayer {
+ ExpectLayer {
+ expected: Arc::new(Mutex::new(self.expected)),
+ name: self.name,
+ current: Mutex::new(Vec::new()),
+ }
+ }
+
+ pub fn run_with_handle(self) -> (ExpectLayer, MockHandle) {
+ let expected = Arc::new(Mutex::new(self.expected));
+ let handle = MockHandle::new(expected.clone(), self.name.clone());
+ let layer = ExpectLayer {
+ expected,
+ name: self.name,
+ current: Mutex::new(Vec::new()),
+ };
+ (layer, handle)
+ }
+}
+
+impl ExpectLayer {
+ fn check_span_ref<'spans, S>(
+ &self,
+ expected: &MockSpan,
+ actual: &SpanRef<'spans, S>,
+ what_happened: impl fmt::Display,
+ ) where
+ S: LookupSpan<'spans>,
+ {
+ if let Some(exp_name) = expected.name() {
+ assert_eq!(
+ actual.name(),
+ exp_name,
+ "\n[{}] expected {} a span named {:?}\n\
+ [{}] but it was named {:?} instead (span {} {:?})",
+ self.name,
+ what_happened,
+ exp_name,
+ self.name,
+ actual.name(),
+ actual.name(),
+ actual.id()
+ );
+ }
+
+ if let Some(exp_level) = expected.level() {
+ let actual_level = actual.metadata().level();
+ assert_eq!(
+ actual_level,
+ &exp_level,
+ "\n[{}] expected {} a span at {:?}\n\
+ [{}] but it was at {:?} instead (span {} {:?})",
+ self.name,
+ what_happened,
+ exp_level,
+ self.name,
+ actual_level,
+ actual.name(),
+ actual.id(),
+ );
+ }
+
+ if let Some(exp_target) = expected.target() {
+ let actual_target = actual.metadata().target();
+ assert_eq!(
+ actual_target,
+ exp_target,
+ "\n[{}] expected {} a span with target {:?}\n\
+ [{}] but it had the target {:?} instead (span {} {:?})",
+ self.name,
+ what_happened,
+ exp_target,
+ self.name,
+ actual_target,
+ actual.name(),
+ actual.id(),
+ );
+ }
+ }
+}
+
+impl<S> Layer<S> for ExpectLayer
+where
+ S: Subscriber + for<'a> LookupSpan<'a>,
+{
+ fn register_callsite(
+ &self,
+ metadata: &'static tracing::Metadata<'static>,
+ ) -> tracing_core::Interest {
+ println!("[{}] register_callsite {:#?}", self.name, metadata);
+ tracing_core::Interest::always()
+ }
+
+ fn on_record(&self, _: &Id, _: &Record<'_>, _: Context<'_, S>) {
+ unimplemented!(
+ "so far, we don't have any tests that need an `on_record` \
+ implementation.\nif you just wrote one that does, feel free to \
+ implement it!"
+ );
+ }
+
+ fn on_event(&self, event: &Event<'_>, cx: Context<'_, S>) {
+ let name = event.metadata().name();
+ println!(
+ "[{}] event: {}; level: {}; target: {}",
+ self.name,
+ name,
+ event.metadata().level(),
+ event.metadata().target(),
+ );
+ match self.expected.lock().unwrap().pop_front() {
+ None => {}
+ Some(Expect::Event(mut expected)) => {
+ let get_parent_name = || cx.event_span(event).map(|span| span.name().to_string());
+ expected.check(event, get_parent_name, &self.name);
+ let mut current_scope = cx.event_scope(event).into_iter().flatten();
+ let expected_scope = expected.scope_mut();
+ let mut i = 0;
+ for (expected, actual) in expected_scope.iter_mut().zip(&mut current_scope) {
+ println!(
+ "[{}] event_scope[{}] actual={} ({:?}); expected={}",
+ self.name,
+ i,
+ actual.name(),
+ actual.id(),
+ expected
+ );
+ self.check_span_ref(
+ expected,
+ &actual,
+ format_args!("the {}th span in the event's scope to be", i),
+ );
+ i += 1;
+ }
+ let remaining_expected = &expected_scope[i..];
+ assert!(
+ remaining_expected.is_empty(),
+ "\n[{}] did not observe all expected spans in event scope!\n[{}] missing: {:#?}",
+ self.name,
+ self.name,
+ remaining_expected,
+ );
+ assert!(
+ current_scope.next().is_none(),
+ "\n[{}] did not expect all spans in the actual event scope!",
+ self.name,
+ );
+ }
+ Some(ex) => ex.bad(&self.name, format_args!("observed event {:#?}", event)),
+ }
+ }
+
+ fn on_follows_from(&self, _span: &Id, _follows: &Id, _: Context<'_, S>) {
+ // TODO: it should be possible to expect spans to follow from other spans
+ }
+
+ fn on_new_span(&self, span: &Attributes<'_>, id: &Id, cx: Context<'_, S>) {
+ let meta = span.metadata();
+ println!(
+ "[{}] new_span: name={:?}; target={:?}; id={:?};",
+ self.name,
+ meta.name(),
+ meta.target(),
+ id
+ );
+ let mut expected = self.expected.lock().unwrap();
+ let was_expected = matches!(expected.front(), Some(Expect::NewSpan(_)));
+ if was_expected {
+ if let Expect::NewSpan(mut expected) = expected.pop_front().unwrap() {
+ let get_parent_name = || {
+ span.parent()
+ .and_then(|id| cx.span(id))
+ .or_else(|| cx.lookup_current())
+ .map(|span| span.name().to_string())
+ };
+ expected.check(span, get_parent_name, &self.name);
+ }
+ }
+ }
+
+ fn on_enter(&self, id: &Id, cx: Context<'_, S>) {
+ let span = cx
+ .span(id)
+ .unwrap_or_else(|| panic!("[{}] no span for ID {:?}", self.name, id));
+ println!("[{}] enter: {}; id={:?};", self.name, span.name(), id);
+ match self.expected.lock().unwrap().pop_front() {
+ None => {}
+ Some(Expect::Enter(ref expected_span)) => {
+ self.check_span_ref(expected_span, &span, "to enter");
+ }
+ Some(ex) => ex.bad(&self.name, format_args!("entered span {:?}", span.name())),
+ }
+ self.current.lock().unwrap().push(id.clone());
+ }
+
+ fn on_exit(&self, id: &Id, cx: Context<'_, S>) {
+ if std::thread::panicking() {
+ // `exit()` can be called in `drop` impls, so we must guard against
+ // double panics.
+ println!("[{}] exit {:?} while panicking", self.name, id);
+ return;
+ }
+ let span = cx
+ .span(id)
+ .unwrap_or_else(|| panic!("[{}] no span for ID {:?}", self.name, id));
+ println!("[{}] exit: {}; id={:?};", self.name, span.name(), id);
+ match self.expected.lock().unwrap().pop_front() {
+ None => {}
+ Some(Expect::Exit(ref expected_span)) => {
+ self.check_span_ref(expected_span, &span, "to exit");
+ let curr = self.current.lock().unwrap().pop();
+ assert_eq!(
+ Some(id),
+ curr.as_ref(),
+ "[{}] exited span {:?}, but the current span was {:?}",
+ self.name,
+ span.name(),
+ curr.as_ref().and_then(|id| cx.span(id)).map(|s| s.name())
+ );
+ }
+ Some(ex) => ex.bad(&self.name, format_args!("exited span {:?}", span.name())),
+ };
+ }
+
+ fn on_close(&self, id: Id, cx: Context<'_, S>) {
+ if std::thread::panicking() {
+ // `try_close` can be called in `drop` impls, so we must guard against
+ // double panics.
+ println!("[{}] close {:?} while panicking", self.name, id);
+ return;
+ }
+ let span = cx.span(&id);
+ let name = span.as_ref().map(|span| {
+ println!("[{}] close_span: {}; id={:?};", self.name, span.name(), id,);
+ span.name()
+ });
+ if name.is_none() {
+ println!("[{}] drop_span: id={:?}", self.name, id);
+ }
+ if let Ok(mut expected) = self.expected.try_lock() {
+ let was_expected = match expected.front() {
+ Some(Expect::DropSpan(ref expected_span)) => {
+ // Don't assert if this function was called while panicking,
+ // as failing the assertion can cause a double panic.
+ if !::std::thread::panicking() {
+ if let Some(ref span) = span {
+ self.check_span_ref(expected_span, span, "to close");
+ }
+ }
+ true
+ }
+ Some(Expect::Event(_)) => {
+ if !::std::thread::panicking() {
+ panic!(
+ "[{}] expected an event, but dropped span {} (id={:?}) instead",
+ self.name,
+ name.unwrap_or("<unknown name>"),
+ id
+ );
+ }
+ true
+ }
+ _ => false,
+ };
+ if was_expected {
+ expected.pop_front();
+ }
+ }
+ }
+
+ fn on_id_change(&self, _old: &Id, _new: &Id, _ctx: Context<'_, S>) {
+ panic!("well-behaved subscribers should never do this to us, lol");
+ }
+}
+
+impl fmt::Debug for ExpectLayer {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let mut s = f.debug_struct("ExpectLayer");
+ s.field("name", &self.name);
+
+ if let Ok(expected) = self.expected.try_lock() {
+ s.field("expected", &expected);
+ } else {
+ s.field("expected", &format_args!("<locked>"));
+ }
+
+ if let Ok(current) = self.current.try_lock() {
+ s.field("current", &format_args!("{:?}", &current));
+ } else {
+ s.field("current", &format_args!("<locked>"));
+ }
+
+ s.finish()
+ }
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/unhinted_layer_filters_dont_break_other_layers.rs b/vendor/tracing-subscriber-0.3.3/tests/unhinted_layer_filters_dont_break_other_layers.rs
new file mode 100644
index 000000000..9fa5c6bd4
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/unhinted_layer_filters_dont_break_other_layers.rs
@@ -0,0 +1,123 @@
+#![cfg(feature = "registry")]
+mod support;
+use self::support::*;
+use tracing::Level;
+use tracing_subscriber::{filter::DynFilterFn, prelude::*};
+
+#[test]
+fn layer_filters() {
+ let (unfiltered, unfiltered_handle) = unfiltered("unfiltered");
+ let (filtered, filtered_handle) = filtered("filtered");
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(unfiltered)
+ .with(filtered.with_filter(filter()))
+ .set_default();
+
+ events();
+
+ unfiltered_handle.assert_finished();
+ filtered_handle.assert_finished();
+}
+
+#[test]
+fn layered_layer_filters() {
+ let (unfiltered1, unfiltered1_handle) = unfiltered("unfiltered_1");
+ let (unfiltered2, unfiltered2_handle) = unfiltered("unfiltered_2");
+ let unfiltered = unfiltered1.and_then(unfiltered2);
+
+ let (filtered1, filtered1_handle) = filtered("filtered_1");
+ let (filtered2, filtered2_handle) = filtered("filtered_2");
+ let filtered = filtered1
+ .with_filter(filter())
+ .and_then(filtered2.with_filter(filter()));
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(unfiltered)
+ .with(filtered)
+ .set_default();
+
+ events();
+
+ unfiltered1_handle.assert_finished();
+ unfiltered2_handle.assert_finished();
+ filtered1_handle.assert_finished();
+ filtered2_handle.assert_finished();
+}
+
+#[test]
+fn out_of_order() {
+ let (unfiltered1, unfiltered1_handle) = unfiltered("unfiltered_1");
+ let (unfiltered2, unfiltered2_handle) = unfiltered("unfiltered_2");
+
+ let (filtered1, filtered1_handle) = filtered("filtered_1");
+ let (filtered2, filtered2_handle) = filtered("filtered_2");
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(unfiltered1)
+ .with(filtered1.with_filter(filter()))
+ .with(unfiltered2)
+ .with(filtered2.with_filter(filter()))
+ .set_default();
+ events();
+
+ unfiltered1_handle.assert_finished();
+ unfiltered2_handle.assert_finished();
+ filtered1_handle.assert_finished();
+ filtered2_handle.assert_finished();
+}
+
+#[test]
+fn mixed_layered() {
+ let (unfiltered1, unfiltered1_handle) = unfiltered("unfiltered_1");
+ let (unfiltered2, unfiltered2_handle) = unfiltered("unfiltered_2");
+ let (filtered1, filtered1_handle) = filtered("filtered_1");
+ let (filtered2, filtered2_handle) = filtered("filtered_2");
+
+ let layered1 = filtered1.with_filter(filter()).and_then(unfiltered1);
+ let layered2 = unfiltered2.and_then(filtered2.with_filter(filter()));
+
+ let _subscriber = tracing_subscriber::registry()
+ .with(layered1)
+ .with(layered2)
+ .set_default();
+
+ events();
+
+ unfiltered1_handle.assert_finished();
+ unfiltered2_handle.assert_finished();
+ filtered1_handle.assert_finished();
+ filtered2_handle.assert_finished();
+}
+
+fn events() {
+ tracing::trace!("hello trace");
+ tracing::debug!("hello debug");
+ tracing::info!("hello info");
+ tracing::warn!("hello warn");
+ tracing::error!("hello error");
+}
+
+fn filter<S>() -> DynFilterFn<S> {
+ DynFilterFn::new(|metadata, _| metadata.level() <= &Level::INFO)
+}
+
+fn unfiltered(name: &str) -> (ExpectLayer, subscriber::MockHandle) {
+ layer::named(name)
+ .event(event::mock().at_level(Level::TRACE))
+ .event(event::mock().at_level(Level::DEBUG))
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle()
+}
+
+fn filtered(name: &str) -> (ExpectLayer, subscriber::MockHandle) {
+ layer::named(name)
+ .event(event::mock().at_level(Level::INFO))
+ .event(event::mock().at_level(Level::WARN))
+ .event(event::mock().at_level(Level::ERROR))
+ .done()
+ .run_with_handle()
+}
diff --git a/vendor/tracing-subscriber-0.3.3/tests/utils.rs b/vendor/tracing-subscriber-0.3.3/tests/utils.rs
new file mode 100644
index 000000000..ff025a2a2
--- /dev/null
+++ b/vendor/tracing-subscriber-0.3.3/tests/utils.rs
@@ -0,0 +1,39 @@
+#![cfg(feature = "std")]
+mod support;
+use self::support::*;
+use tracing_subscriber::prelude::*;
+
+#[test]
+fn init_ext_works() {
+ let (subscriber, finished) = subscriber::mock()
+ .event(
+ event::mock()
+ .at_level(tracing::Level::INFO)
+ .with_target("init_works"),
+ )
+ .done()
+ .run_with_handle();
+
+ let _guard = subscriber.set_default();
+ tracing::info!(target: "init_works", "it worked!");
+ finished.assert_finished();
+}
+
+#[test]
+#[cfg(feature = "fmt")]
+fn builders_are_init_ext() {
+ tracing_subscriber::fmt().set_default();
+ let _ = tracing_subscriber::fmt()
+ .with_target(false)
+ .compact()
+ .try_init();
+}
+
+#[test]
+#[cfg(all(feature = "fmt", feature = "env-filter"))]
+fn layered_is_init_ext() {
+ tracing_subscriber::registry()
+ .with(tracing_subscriber::fmt::layer())
+ .with(tracing_subscriber::EnvFilter::new("foo=info"))
+ .set_default();
+}