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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
| commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
| tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /third_party/rust/env_logger | |
| parent | Initial commit. (diff) | |
| download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip | |
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/env_logger')
31 files changed, 5244 insertions, 0 deletions
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`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 = "2021" +rust-version = "1.60.0" +name = "env_logger" +version = "0.10.0" +include = [ + "build.rs", + "src/**/*", + "Cargo.toml", + "LICENSE*", + "README.md", + "tests/**/*", + "benches/**/*", + "examples/**/*", +] +description = """ +A logging implementation for `log` which is configured via an environment +variable. +""" +readme = "README.md" +keywords = [ + "logging", + "log", + "logger", +] +categories = ["development-tools::debugging"] +license = "MIT OR Apache-2.0" +repository = "https://github.com/rust-cli/env_logger/" + +[[package.metadata.release.pre-release-replacements]] +file = "CHANGELOG.md" +search = "Unreleased" +replace = "{{version}}" +min = 1 + 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true + +[dependencies.is-terminal] +version = "0.4.0" +optional = true + +[dependencies.log] +version = "0.4.8" +features = ["std"] + +[dependencies.regex] +version = "1.0.3" +features = [ + "std", + "perf", +] +optional = true +default-features = false + +[dependencies.termcolor] +version = "1.1.1" +optional = true + +[features] +auto-color = [ + "dep:is-terminal", + "color", +] +color = ["dep:termcolor"] +default = [ + "auto-color", + "humantime", + "regex", +] +humantime = ["dep:humantime"] +regex = ["dep:regex"] diff --git a/third_party/rust/env_logger/LICENSE-APACHE b/third_party/rust/env_logger/LICENSE-APACHE new file mode 100644 index 0000000000..16fe87b06e --- /dev/null +++ b/third_party/rust/env_logger/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + +Copyright [yyyy] [name of copyright owner] + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. diff --git a/third_party/rust/env_logger/LICENSE-MIT b/third_party/rust/env_logger/LICENSE-MIT new file mode 100644 index 0000000000..31aa79387f --- /dev/null +++ b/third_party/rust/env_logger/LICENSE-MIT @@ -0,0 +1,23 @@ +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/third_party/rust/env_logger/README.md b/third_party/rust/env_logger/README.md new file mode 100644 index 0000000000..75add88fe9 --- /dev/null +++ b/third_party/rust/env_logger/README.md @@ -0,0 +1,183 @@ +# env_logger + +[](https://crates.io/crates/env_logger) +[](https://docs.rs/env_logger) +[](https://env-logger-rs.github.io/env_logger/env_logger/index.html) + +Implements a logger that can be configured via environment variables. + +## Usage + +### In libraries + +`env_logger` makes sense when used in executables (binary projects). Libraries should use the [`log`](https://docs.rs/log) crate instead. + +### In executables + +It must be added along with `log` to the project dependencies: + +```toml +[dependencies] +log = "0.4.0" +env_logger = "0.9.0" +``` + +`env_logger` must be initialized as early as possible in the project. After it's initialized, you can use the `log` macros to do actual logging. + +```rust +#[macro_use] +extern crate log; + +fn main() { + env_logger::init(); + + info!("starting up"); + + // ... +} +``` + +Then when running the executable, specify a value for the **`RUST_LOG`** +environment variable that corresponds with the log messages you want to show. + +```bash +$ RUST_LOG=info ./main +[2018-11-03T06:09:06Z INFO default] starting up +``` + +The letter case is not significant for the logging level names; e.g., `debug`, +`DEBUG`, and `dEbuG` all represent the same logging level. Therefore, the +previous example could also have been written this way, specifying the log +level as `INFO` rather than as `info`: + +```bash +$ RUST_LOG=INFO ./main +[2018-11-03T06:09:06Z INFO default] starting up +``` + +So which form should you use? For consistency, our convention is to use lower +case names. Where our docs do use other forms, they do so in the context of +specific examples, so you won't be surprised if you see similar usage in the +wild. + +The log levels that may be specified correspond to the [`log::Level`][level-enum] +enum from the `log` crate. They are: + + * `error` + * `warn` + * `info` + * `debug` + * `trace` + +[level-enum]: https://docs.rs/log/latest/log/enum.Level.html "log::Level (docs.rs)" + +There is also a pseudo logging level, `off`, which may be specified to disable +all logging for a given module or for the entire application. As with the +logging levels, the letter case is not significant. + +`env_logger` can be configured in other ways besides an environment variable. See [the examples](https://github.com/env-logger-rs/env_logger/tree/main/examples) for more approaches. + +### In tests + +Tests can use the `env_logger` crate to see log messages generated during that test: + +```toml +[dependencies] +log = "0.4.0" + +[dev-dependencies] +env_logger = "0.9.0" +``` + +```rust +#[macro_use] +extern crate log; + +fn add_one(num: i32) -> i32 { + info!("add_one called with {}", num); + num + 1 +} + +#[cfg(test)] +mod tests { + use super::*; + + fn init() { + let _ = env_logger::builder().is_test(true).try_init(); + } + + #[test] + fn it_adds_one() { + init(); + + info!("can log from the test too"); + assert_eq!(3, add_one(2)); + } + + #[test] + fn it_handles_negative_numbers() { + init(); + + info!("logging from another test"); + assert_eq!(-7, add_one(-8)); + } +} +``` + +Assuming the module under test is called `my_lib`, running the tests with the +`RUST_LOG` filtering to info messages from this module looks like: + +```bash +$ RUST_LOG=my_lib=info cargo test + Running target/debug/my_lib-... + +running 2 tests +[INFO my_lib::tests] logging from another test +[INFO my_lib] add_one called with -8 +test tests::it_handles_negative_numbers ... ok +[INFO my_lib::tests] can log from the test too +[INFO my_lib] add_one called with 2 +test tests::it_adds_one ... ok + +test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured +``` + +Note that `env_logger::try_init()` needs to be called in each test in which you +want to enable logging. Additionally, the default behavior of tests to +run in parallel means that logging output may be interleaved with test output. +Either run tests in a single thread by specifying `RUST_TEST_THREADS=1` or by +running one test by specifying its name as an argument to the test binaries as +directed by the `cargo test` help docs: + +```bash +$ RUST_LOG=my_lib=info cargo test it_adds_one + Running target/debug/my_lib-... + +running 1 test +[INFO my_lib::tests] can log from the test too +[INFO my_lib] add_one called with 2 +test tests::it_adds_one ... ok + +test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured +``` + +## Configuring log target + +By default, `env_logger` logs to stderr. If you want to log to stdout instead, +you can use the `Builder` to change the log target: + +```rust +use std::env; +use env_logger::{Builder, Target}; + +let mut builder = Builder::from_default_env(); +builder.target(Target::Stdout); + +builder.init(); +``` + +## Stability of the default format + +The default format won't optimise for long-term stability, and explicitly makes no guarantees about the stability of its output across major, minor or patch version bumps during `0.x`. + +If you want to capture or interpret the output of `env_logger` programmatically then you should use a custom format. diff --git a/third_party/rust/env_logger/examples/custom_default_format.rs b/third_party/rust/env_logger/examples/custom_default_format.rs new file mode 100644 index 0000000000..b04eb6028d --- /dev/null +++ b/third_party/rust/env_logger/examples/custom_default_format.rs @@ -0,0 +1,40 @@ +/*! +Disabling parts of the default format. + +Before running this example, try setting the `MY_LOG_LEVEL` environment variable to `info`: + +```no_run,shell +$ export MY_LOG_LEVEL='info' +``` + +Also try setting the `MY_LOG_STYLE` environment variable to `never` to disable colors +or `auto` to enable them: + +```no_run,shell +$ export MY_LOG_STYLE=never +``` + +If you want to control the logging output completely, see the `custom_logger` example. +*/ + +#[macro_use] +extern crate log; + +use env_logger::{Builder, Env}; + +fn init_logger() { + let env = Env::default() + .filter("MY_LOG_LEVEL") + .write_style("MY_LOG_STYLE"); + + Builder::from_env(env) + .format_level(false) + .format_timestamp_nanos() + .init(); +} + +fn main() { + init_logger(); + + info!("a log from `MyLogger`"); +} diff --git a/third_party/rust/env_logger/examples/custom_format.rs b/third_party/rust/env_logger/examples/custom_format.rs new file mode 100644 index 0000000000..cc16b336ff --- /dev/null +++ b/third_party/rust/env_logger/examples/custom_format.rs @@ -0,0 +1,54 @@ +/*! +Changing the default logging format. + +Before running this example, try setting the `MY_LOG_LEVEL` environment variable to `info`: + +```no_run,shell +$ export MY_LOG_LEVEL='info' +``` + +Also try setting the `MY_LOG_STYLE` environment variable to `never` to disable colors +or `auto` to enable them: + +```no_run,shell +$ export MY_LOG_STYLE=never +``` + +If you want to control the logging output completely, see the `custom_logger` example. +*/ + +#[cfg(all(feature = "color", feature = "humantime"))] +fn main() { + use env_logger::{fmt::Color, Builder, Env}; + + use std::io::Write; + + fn init_logger() { + let env = Env::default() + .filter("MY_LOG_LEVEL") + .write_style("MY_LOG_STYLE"); + + Builder::from_env(env) + .format(|buf, record| { + let mut style = buf.style(); + style.set_bg(Color::Yellow).set_bold(true); + + let timestamp = buf.timestamp(); + + writeln!( + buf, + "My formatted log ({}): {}", + timestamp, + style.value(record.args()) + ) + }) + .init(); + } + + init_logger(); + + log::info!("a log from `MyLogger`"); +} + +#[cfg(not(all(feature = "color", feature = "humantime")))] +fn main() {} diff --git a/third_party/rust/env_logger/examples/custom_logger.rs b/third_party/rust/env_logger/examples/custom_logger.rs new file mode 100644 index 0000000000..ca3a4a9012 --- /dev/null +++ b/third_party/rust/env_logger/examples/custom_logger.rs @@ -0,0 +1,62 @@ +/*! +Using `env_logger` to drive a custom logger. + +Before running this example, try setting the `MY_LOG_LEVEL` environment variable to `info`: + +```no_run,shell +$ export MY_LOG_LEVEL='info' +``` + +If you only want to change the way logs are formatted, look at the `custom_format` example. +*/ + +#[macro_use] +extern crate log; + +use env_logger::filter::{Builder, Filter}; + +use log::{Log, Metadata, Record, SetLoggerError}; + +const FILTER_ENV: &str = "MY_LOG_LEVEL"; + +struct MyLogger { + inner: Filter, +} + +impl MyLogger { + fn new() -> MyLogger { + let mut builder = Builder::from_env(FILTER_ENV); + + MyLogger { + inner: builder.build(), + } + } + + fn init() -> Result<(), SetLoggerError> { + let logger = Self::new(); + + log::set_max_level(logger.inner.filter()); + log::set_boxed_logger(Box::new(logger)) + } +} + +impl Log for MyLogger { + fn enabled(&self, metadata: &Metadata) -> bool { + self.inner.enabled(metadata) + } + + fn log(&self, record: &Record) { + // Check if the record is matched by the logger before logging + if self.inner.matches(record) { + println!("{} - {}", record.level(), record.args()); + } + } + + fn flush(&self) {} +} + +fn main() { + MyLogger::init().unwrap(); + + info!("a log from `MyLogger`"); +} diff --git a/third_party/rust/env_logger/examples/default.rs b/third_party/rust/env_logger/examples/default.rs new file mode 100644 index 0000000000..67bb030745 --- /dev/null +++ b/third_party/rust/env_logger/examples/default.rs @@ -0,0 +1,38 @@ +/*! +Using `env_logger`. + +Before running this example, try setting the `MY_LOG_LEVEL` environment variable to `info`: + +```no_run,shell +$ export MY_LOG_LEVEL='info' +``` + +Also try setting the `MY_LOG_STYLE` environment variable to `never` to disable colors +or `auto` to enable them: + +```no_run,shell +$ export MY_LOG_STYLE=never +``` +*/ + +#[macro_use] +extern crate log; + +use env_logger::Env; + +fn main() { + // The `Env` lets us tweak what the environment + // variables to read are and what the default + // value is if they're missing + let env = Env::default() + .filter_or("MY_LOG_LEVEL", "trace") + .write_style_or("MY_LOG_STYLE", "always"); + + env_logger::init_from_env(env); + + trace!("some trace log"); + debug!("some debug log"); + info!("some information log"); + warn!("some warning log"); + error!("some error log"); +} diff --git a/third_party/rust/env_logger/examples/direct_logger.rs b/third_party/rust/env_logger/examples/direct_logger.rs new file mode 100644 index 0000000000..4d7f39d0ae --- /dev/null +++ b/third_party/rust/env_logger/examples/direct_logger.rs @@ -0,0 +1,39 @@ +/*! +Using `env_logger::Logger` and the `log::Log` trait directly. + +This example doesn't rely on environment variables, or having a static logger installed. +*/ + +use env_logger::{Builder, WriteStyle}; + +use log::{Level, LevelFilter, Log, MetadataBuilder, Record}; + +fn record() -> Record<'static> { + let error_metadata = MetadataBuilder::new() + .target("myApp") + .level(Level::Error) + .build(); + + Record::builder() + .metadata(error_metadata) + .args(format_args!("Error!")) + .line(Some(433)) + .file(Some("app.rs")) + .module_path(Some("server")) + .build() +} + +fn main() { + let stylish_logger = Builder::new() + .filter(None, LevelFilter::Error) + .write_style(WriteStyle::Always) + .build(); + + let unstylish_logger = Builder::new() + .filter(None, LevelFilter::Error) + .write_style(WriteStyle::Never) + .build(); + + stylish_logger.log(&record()); + unstylish_logger.log(&record()); +} diff --git a/third_party/rust/env_logger/examples/filters_from_code.rs b/third_party/rust/env_logger/examples/filters_from_code.rs new file mode 100644 index 0000000000..c877a44253 --- /dev/null +++ b/third_party/rust/env_logger/examples/filters_from_code.rs @@ -0,0 +1,20 @@ +/*! +Specify logging filters in code instead of using an environment variable. +*/ + +#[macro_use] +extern crate log; + +use env_logger::Builder; + +use log::LevelFilter; + +fn main() { + Builder::new().filter_level(LevelFilter::max()).init(); + + trace!("some trace log"); + debug!("some debug log"); + info!("some information log"); + warn!("some warning log"); + error!("some error log"); +} diff --git a/third_party/rust/env_logger/examples/in_tests.rs b/third_party/rust/env_logger/examples/in_tests.rs new file mode 100644 index 0000000000..c4487cc9c1 --- /dev/null +++ b/third_party/rust/env_logger/examples/in_tests.rs @@ -0,0 +1,54 @@ +/*! +Using `env_logger` in tests. + +Log events will be captured by `cargo` and only printed if the test fails. +You can run this example by calling: + +```text +cargo test --example in_tests +``` + +You should see the `it_does_not_work` test fail and include its log output. +*/ + +#[cfg_attr(test, macro_use)] +extern crate log; + +fn main() {} + +#[cfg(test)] +mod tests { + fn init_logger() { + let _ = env_logger::builder() + // Include all events in tests + .filter_level(log::LevelFilter::max()) + // Ensure events are captured by `cargo test` + .is_test(true) + // Ignore errors initializing the logger if tests race to configure it + .try_init(); + } + + #[test] + fn it_works() { + init_logger(); + + let a = 1; + let b = 2; + + debug!("checking whether {} + {} = 3", a, b); + + assert_eq!(3, a + b); + } + + #[test] + fn it_does_not_work() { + init_logger(); + + let a = 1; + let b = 2; + + debug!("checking whether {} + {} = 6", a, b); + + assert_eq!(6, a + b); + } +} diff --git a/third_party/rust/env_logger/examples/syslog_friendly_format.rs b/third_party/rust/env_logger/examples/syslog_friendly_format.rs new file mode 100644 index 0000000000..9809ab3f87 --- /dev/null +++ b/third_party/rust/env_logger/examples/syslog_friendly_format.rs @@ -0,0 +1,24 @@ +use std::io::Write;
+
+fn main() {
+ match std::env::var("RUST_LOG_STYLE") {
+ Ok(s) if s == "SYSTEMD" => env_logger::builder()
+ .format(|buf, record| {
+ writeln!(
+ buf,
+ "<{}>{}: {}",
+ match record.level() {
+ log::Level::Error => 3,
+ log::Level::Warn => 4,
+ log::Level::Info => 6,
+ log::Level::Debug => 7,
+ log::Level::Trace => 7,
+ },
+ record.target(),
+ record.args()
+ )
+ })
+ .init(),
+ _ => env_logger::init(),
+ };
+}
diff --git a/third_party/rust/env_logger/src/filter/mod.rs b/third_party/rust/env_logger/src/filter/mod.rs new file mode 100644 index 0000000000..721dcb4634 --- /dev/null +++ b/third_party/rust/env_logger/src/filter/mod.rs @@ -0,0 +1,868 @@ +//! Filtering for log records. +//! +//! This module contains the log filtering used by `env_logger` to match records. +//! You can use the `Filter` type in your own logger implementation to use the same +//! filter parsing and matching as `env_logger`. For more details about the format +//! for directive strings see [Enabling Logging]. +//! +//! ## Using `env_logger` in your own logger +//! +//! You can use `env_logger`'s filtering functionality with your own logger. +//! Call [`Builder::parse`] to parse directives from a string when constructing +//! your logger. Call [`Filter::matches`] to check whether a record should be +//! logged based on the parsed filters when log records are received. +//! +//! ``` +//! extern crate log; +//! extern crate env_logger; +//! use env_logger::filter::Filter; +//! use log::{Log, Metadata, Record}; +//! +//! struct MyLogger { +//! filter: Filter +//! } +//! +//! impl MyLogger { +//! fn new() -> MyLogger { +//! use env_logger::filter::Builder; +//! let mut builder = Builder::new(); +//! +//! // Parse a directives string from an environment variable +//! if let Ok(ref filter) = std::env::var("MY_LOG_LEVEL") { +//! builder.parse(filter); +//! } +//! +//! MyLogger { +//! filter: builder.build() +//! } +//! } +//! } +//! +//! impl Log for MyLogger { +//! fn enabled(&self, metadata: &Metadata) -> bool { +//! self.filter.enabled(metadata) +//! } +//! +//! fn log(&self, record: &Record) { +//! // Check if the record is matched by the filter +//! if self.filter.matches(record) { +//! println!("{:?}", record); +//! } +//! } +//! +//! fn flush(&self) {} +//! } +//! ``` +//! +//! [Enabling Logging]: ../index.html#enabling-logging +//! [`Builder::parse`]: struct.Builder.html#method.parse +//! [`Filter::matches`]: struct.Filter.html#method.matches + +use log::{Level, LevelFilter, Metadata, Record}; +use std::collections::HashMap; +use std::env; +use std::fmt; +use std::mem; + +#[cfg(feature = "regex")] +#[path = "regex.rs"] +mod inner; + +#[cfg(not(feature = "regex"))] +#[path = "string.rs"] +mod inner; + +/// A log filter. +/// +/// This struct can be used to determine whether or not a log record +/// should be written to the output. +/// Use the [`Builder`] type to parse and construct a `Filter`. +/// +/// [`Builder`]: struct.Builder.html +pub struct Filter { + directives: Vec<Directive>, + filter: Option<inner::Filter>, +} + +/// A builder for a log filter. +/// +/// It can be used to parse a set of directives from a string before building +/// a [`Filter`] instance. +/// +/// ## Example +/// +/// ``` +/// # #[macro_use] extern crate log; +/// # use std::env; +/// use env_logger::filter::Builder; +/// +/// let mut builder = Builder::new(); +/// +/// // Parse a logging filter from an environment variable. +/// if let Ok(rust_log) = env::var("RUST_LOG") { +/// builder.parse(&rust_log); +/// } +/// +/// let filter = builder.build(); +/// ``` +/// +/// [`Filter`]: struct.Filter.html +pub struct Builder { + directives: HashMap<Option<String>, LevelFilter>, + filter: Option<inner::Filter>, + built: bool, +} + +#[derive(Debug)] +struct Directive { + name: Option<String>, + level: LevelFilter, +} + +impl Filter { + /// Returns the maximum `LevelFilter` that this filter instance is + /// configured to output. + /// + /// # Example + /// + /// ```rust + /// use log::LevelFilter; + /// use env_logger::filter::Builder; + /// + /// let mut builder = Builder::new(); + /// builder.filter(Some("module1"), LevelFilter::Info); + /// builder.filter(Some("module2"), LevelFilter::Error); + /// + /// let filter = builder.build(); + /// assert_eq!(filter.filter(), LevelFilter::Info); + /// ``` + pub fn filter(&self) -> LevelFilter { + self.directives + .iter() + .map(|d| d.level) + .max() + .unwrap_or(LevelFilter::Off) + } + + /// Checks if this record matches the configured filter. + pub fn matches(&self, record: &Record) -> bool { + if !self.enabled(record.metadata()) { + return false; + } + + if let Some(filter) = self.filter.as_ref() { + if !filter.is_match(&record.args().to_string()) { + return false; + } + } + + true + } + + /// Determines if a log message with the specified metadata would be logged. + pub fn enabled(&self, metadata: &Metadata) -> bool { + let level = metadata.level(); + let target = metadata.target(); + + enabled(&self.directives, level, target) + } +} + +impl Builder { + /// Initializes the filter builder with defaults. + pub fn new() -> Builder { + Builder { + directives: HashMap::new(), + filter: None, + built: false, + } + } + + /// Initializes the filter builder from an environment. + pub fn from_env(env: &str) -> Builder { + let mut builder = Builder::new(); + + if let Ok(s) = env::var(env) { + builder.parse(&s); + } + + builder + } + + /// Adds a directive to the filter for a specific module. + pub fn filter_module(&mut self, module: &str, level: LevelFilter) -> &mut Self { + self.filter(Some(module), level) + } + + /// Adds a directive to the filter for all modules. + pub fn filter_level(&mut self, level: LevelFilter) -> &mut Self { + self.filter(None, level) + } + + /// Adds a directive to the filter. + /// + /// The given module (if any) will log at most the specified level provided. + /// If no module is provided then the filter will apply to all log messages. + pub fn filter(&mut self, module: Option<&str>, level: LevelFilter) -> &mut Self { + self.directives.insert(module.map(|s| s.to_string()), level); + self + } + + /// Parses the directives string. + /// + /// See the [Enabling Logging] section for more details. + /// + /// [Enabling Logging]: ../index.html#enabling-logging + pub fn parse(&mut self, filters: &str) -> &mut Self { + let (directives, filter) = parse_spec(filters); + + self.filter = filter; + + for directive in directives { + self.directives.insert(directive.name, directive.level); + } + self + } + + /// Build a log filter. + pub fn build(&mut self) -> Filter { + assert!(!self.built, "attempt to re-use consumed builder"); + self.built = true; + + let mut directives = Vec::new(); + if self.directives.is_empty() { + // Adds the default filter if none exist + directives.push(Directive { + name: None, + level: LevelFilter::Error, + }); + } else { + // Consume map of directives. + let directives_map = mem::take(&mut self.directives); + directives = directives_map + .into_iter() + .map(|(name, level)| Directive { name, level }) + .collect(); + // Sort the directives by length of their name, this allows a + // little more efficient lookup at runtime. + directives.sort_by(|a, b| { + let alen = a.name.as_ref().map(|a| a.len()).unwrap_or(0); + let blen = b.name.as_ref().map(|b| b.len()).unwrap_or(0); + alen.cmp(&blen) + }); + } + + Filter { + directives: mem::take(&mut directives), + filter: mem::replace(&mut self.filter, None), + } + } +} + +impl Default for Builder { + fn default() -> Self { + Builder::new() + } +} + +impl fmt::Debug for Filter { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.debug_struct("Filter") + .field("filter", &self.filter) + .field("directives", &self.directives) + .finish() + } +} + +impl fmt::Debug for Builder { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + if self.built { + f.debug_struct("Filter").field("built", &true).finish() + } else { + f.debug_struct("Filter") + .field("filter", &self.filter) + .field("directives", &self.directives) + .finish() + } + } +} + +/// Parse a logging specification string (e.g: "crate1,crate2::mod3,crate3::x=error/foo") +/// and return a vector with log directives. +fn parse_spec(spec: &str) -> (Vec<Directive>, Option<inner::Filter>) { + let mut dirs = Vec::new(); + + let mut parts = spec.split('/'); + let mods = parts.next(); + let filter = parts.next(); + if parts.next().is_some() { + eprintln!( + "warning: invalid logging spec '{}', \ + ignoring it (too many '/'s)", + spec + ); + return (dirs, None); + } + if let Some(m) = mods { + for s in m.split(',').map(|ss| ss.trim()) { + if s.is_empty() { + continue; + } + let mut parts = s.split('='); + let (log_level, name) = + match (parts.next(), parts.next().map(|s| s.trim()), parts.next()) { + (Some(part0), None, None) => { + // if the single argument is a log-level string or number, + // treat that as a global fallback + match part0.parse() { + Ok(num) => (num, None), + Err(_) => (LevelFilter::max(), Some(part0)), + } + } + (Some(part0), Some(""), None) => (LevelFilter::max(), Some(part0)), + (Some(part0), Some(part1), None) => match part1.parse() { + Ok(num) => (num, Some(part0)), + _ => { + eprintln!( + "warning: invalid logging spec '{}', \ + ignoring it", + part1 + ); + continue; + } + }, + _ => { + eprintln!( + "warning: invalid logging spec '{}', \ + ignoring it", + s + ); + continue; + } + }; + dirs.push(Directive { + name: name.map(|s| s.to_string()), + level: log_level, + }); + } + } + + let filter = filter.and_then(|filter| match inner::Filter::new(filter) { + Ok(re) => Some(re), + Err(e) => { + eprintln!("warning: invalid regex filter - {}", e); + None + } + }); + + (dirs, filter) +} + +// Check whether a level and target are enabled by the set of directives. +fn enabled(directives: &[Directive], level: Level, target: &str) -> bool { + // Search for the longest match, the vector is assumed to be pre-sorted. + for directive in directives.iter().rev() { + match directive.name { + Some(ref name) if !target.starts_with(&**name) => {} + Some(..) | None => return level <= directive.level, + } + } + false +} + +#[cfg(test)] +mod tests { + use log::{Level, LevelFilter}; + + use super::{enabled, parse_spec, Builder, Directive, Filter}; + + fn make_logger_filter(dirs: Vec<Directive>) -> Filter { + let mut logger = Builder::new().build(); + logger.directives = dirs; + logger + } + + #[test] + fn filter_info() { + let logger = Builder::new().filter(None, LevelFilter::Info).build(); + assert!(enabled(&logger.directives, Level::Info, "crate1")); + assert!(!enabled(&logger.directives, Level::Debug, "crate1")); + } + + #[test] + fn filter_beginning_longest_match() { + let logger = Builder::new() + .filter(Some("crate2"), LevelFilter::Info) + .filter(Some("crate2::mod"), LevelFilter::Debug) + .filter(Some("crate1::mod1"), LevelFilter::Warn) + .build(); + assert!(enabled(&logger.directives, Level::Debug, "crate2::mod1")); + assert!(!enabled(&logger.directives, Level::Debug, "crate2")); + } + + // Some of our tests are only correct or complete when they cover the full + // universe of variants for log::Level. In the unlikely event that a new + // variant is added in the future, this test will detect the scenario and + // alert us to the need to review and update the tests. In such a + // situation, this test will fail to compile, and the error message will + // look something like this: + // + // error[E0004]: non-exhaustive patterns: `NewVariant` not covered + // --> src/filter/mod.rs:413:15 + // | + // 413 | match level_universe { + // | ^^^^^^^^^^^^^^ pattern `NewVariant` not covered + #[test] + fn ensure_tests_cover_level_universe() { + let level_universe: Level = Level::Trace; // use of trace variant is arbitrary + match level_universe { + Level::Error | Level::Warn | Level::Info | Level::Debug | Level::Trace => (), + } + } + + #[test] + fn parse_default() { + let logger = Builder::new().parse("info,crate1::mod1=warn").build(); + assert!(enabled(&logger.directives, Level::Warn, "crate1::mod1")); + assert!(enabled(&logger.directives, Level::Info, "crate2::mod2")); + } + + #[test] + fn parse_default_bare_level_off_lc() { + let logger = Builder::new().parse("off").build(); + assert!(!enabled(&logger.directives, Level::Error, "")); + assert!(!enabled(&logger.directives, Level::Warn, "")); + assert!(!enabled(&logger.directives, Level::Info, "")); + assert!(!enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + + #[test] + fn parse_default_bare_level_off_uc() { + let logger = Builder::new().parse("OFF").build(); + assert!(!enabled(&logger.directives, Level::Error, "")); + assert!(!enabled(&logger.directives, Level::Warn, "")); + assert!(!enabled(&logger.directives, Level::Info, "")); + assert!(!enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + + #[test] + fn parse_default_bare_level_error_lc() { + let logger = Builder::new().parse("error").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(!enabled(&logger.directives, Level::Warn, "")); + assert!(!enabled(&logger.directives, Level::Info, "")); + assert!(!enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + + #[test] + fn parse_default_bare_level_error_uc() { + let logger = Builder::new().parse("ERROR").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(!enabled(&logger.directives, Level::Warn, "")); + assert!(!enabled(&logger.directives, Level::Info, "")); + assert!(!enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + + #[test] + fn parse_default_bare_level_warn_lc() { + let logger = Builder::new().parse("warn").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(!enabled(&logger.directives, Level::Info, "")); + assert!(!enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + + #[test] + fn parse_default_bare_level_warn_uc() { + let logger = Builder::new().parse("WARN").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(!enabled(&logger.directives, Level::Info, "")); + assert!(!enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + + #[test] + fn parse_default_bare_level_info_lc() { + let logger = Builder::new().parse("info").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(enabled(&logger.directives, Level::Info, "")); + assert!(!enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + + #[test] + fn parse_default_bare_level_info_uc() { + let logger = Builder::new().parse("INFO").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(enabled(&logger.directives, Level::Info, "")); + assert!(!enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + + #[test] + fn parse_default_bare_level_debug_lc() { + let logger = Builder::new().parse("debug").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(enabled(&logger.directives, Level::Info, "")); + assert!(enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + + #[test] + fn parse_default_bare_level_debug_uc() { + let logger = Builder::new().parse("DEBUG").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(enabled(&logger.directives, Level::Info, "")); + assert!(enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + + #[test] + fn parse_default_bare_level_trace_lc() { + let logger = Builder::new().parse("trace").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(enabled(&logger.directives, Level::Info, "")); + assert!(enabled(&logger.directives, Level::Debug, "")); + assert!(enabled(&logger.directives, Level::Trace, "")); + } + + #[test] + fn parse_default_bare_level_trace_uc() { + let logger = Builder::new().parse("TRACE").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(enabled(&logger.directives, Level::Info, "")); + assert!(enabled(&logger.directives, Level::Debug, "")); + assert!(enabled(&logger.directives, Level::Trace, "")); + } + + // In practice, the desired log level is typically specified by a token + // that is either all lowercase (e.g., 'trace') or all uppercase (.e.g, + // 'TRACE'), but this tests serves as a reminder that + // log::Level::from_str() ignores all case variants. + #[test] + fn parse_default_bare_level_debug_mixed() { + { + let logger = Builder::new().parse("Debug").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(enabled(&logger.directives, Level::Info, "")); + assert!(enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + { + let logger = Builder::new().parse("debuG").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(enabled(&logger.directives, Level::Info, "")); + assert!(enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + { + let logger = Builder::new().parse("deBug").build(); + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(enabled(&logger.directives, Level::Info, "")); + assert!(enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + { + let logger = Builder::new().parse("DeBuG").build(); // LaTeX flavor! + assert!(enabled(&logger.directives, Level::Error, "")); + assert!(enabled(&logger.directives, Level::Warn, "")); + assert!(enabled(&logger.directives, Level::Info, "")); + assert!(enabled(&logger.directives, Level::Debug, "")); + assert!(!enabled(&logger.directives, Level::Trace, "")); + } + } + + #[test] + fn match_full_path() { + let logger = make_logger_filter(vec![ + Directive { + name: Some("crate2".to_string()), + level: LevelFilter::Info, + }, + Directive { + name: Some("crate1::mod1".to_string()), + level: LevelFilter::Warn, + }, + ]); + assert!(enabled(&logger.directives, Level::Warn, "crate1::mod1")); + assert!(!enabled(&logger.directives, Level::Info, "crate1::mod1")); + assert!(enabled(&logger.directives, Level::Info, "crate2")); + assert!(!enabled(&logger.directives, Level::Debug, "crate2")); + } + + #[test] + fn no_match() { + let logger = make_logger_filter(vec![ + Directive { + name: Some("crate2".to_string()), + level: LevelFilter::Info, + }, + Directive { + name: Some("crate1::mod1".to_string()), + level: LevelFilter::Warn, + }, + ]); + assert!(!enabled(&logger.directives, Level::Warn, "crate3")); + } + + #[test] + fn match_beginning() { + let logger = make_logger_filter(vec![ + Directive { + name: Some("crate2".to_string()), + level: LevelFilter::Info, + }, + Directive { + name: Some("crate1::mod1".to_string()), + level: LevelFilter::Warn, + }, + ]); + assert!(enabled(&logger.directives, Level::Info, "crate2::mod1")); + } + + #[test] + fn match_beginning_longest_match() { + let logger = make_logger_filter(vec![ + Directive { + name: Some("crate2".to_string()), + level: LevelFilter::Info, + }, + Directive { + name: Some("crate2::mod".to_string()), + level: LevelFilter::Debug, + }, + Directive { + name: Some("crate1::mod1".to_string()), + level: LevelFilter::Warn, + }, + ]); + assert!(enabled(&logger.directives, Level::Debug, "crate2::mod1")); + assert!(!enabled(&logger.directives, Level::Debug, "crate2")); + } + + #[test] + fn match_default() { + let logger = make_logger_filter(vec![ + Directive { + name: None, + level: LevelFilter::Info, + }, + Directive { + name: Some("crate1::mod1".to_string()), + level: LevelFilter::Warn, + }, + ]); + assert!(enabled(&logger.directives, Level::Warn, "crate1::mod1")); + assert!(enabled(&logger.directives, Level::Info, "crate2::mod2")); + } + + #[test] + fn zero_level() { + let logger = make_logger_filter(vec![ + Directive { + name: None, + level: LevelFilter::Info, + }, + Directive { + name: Some("crate1::mod1".to_string()), + level: LevelFilter::Off, + }, + ]); + assert!(!enabled(&logger.directives, Level::Error, "crate1::mod1")); + assert!(enabled(&logger.directives, Level::Info, "crate2::mod2")); + } + + #[test] + fn parse_spec_valid() { + let (dirs, filter) = parse_spec("crate1::mod1=error,crate1::mod2,crate2=debug"); + assert_eq!(dirs.len(), 3); + assert_eq!(dirs[0].name, Some("crate1::mod1".to_string())); + assert_eq!(dirs[0].level, LevelFilter::Error); + + assert_eq!(dirs[1].name, Some("crate1::mod2".to_string())); + assert_eq!(dirs[1].level, LevelFilter::max()); + + assert_eq!(dirs[2].name, Some("crate2".to_string())); + assert_eq!(dirs[2].level, LevelFilter::Debug); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_invalid_crate() { + // test parse_spec with multiple = in specification + let (dirs, filter) = parse_spec("crate1::mod1=warn=info,crate2=debug"); + assert_eq!(dirs.len(), 1); + assert_eq!(dirs[0].name, Some("crate2".to_string())); + assert_eq!(dirs[0].level, LevelFilter::Debug); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_invalid_level() { + // test parse_spec with 'noNumber' as log level + let (dirs, filter) = parse_spec("crate1::mod1=noNumber,crate2=debug"); + assert_eq!(dirs.len(), 1); + assert_eq!(dirs[0].name, Some("crate2".to_string())); + assert_eq!(dirs[0].level, LevelFilter::Debug); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_string_level() { + // test parse_spec with 'warn' as log level + let (dirs, filter) = parse_spec("crate1::mod1=wrong,crate2=warn"); + assert_eq!(dirs.len(), 1); + assert_eq!(dirs[0].name, Some("crate2".to_string())); + assert_eq!(dirs[0].level, LevelFilter::Warn); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_empty_level() { + // test parse_spec with '' as log level + let (dirs, filter) = parse_spec("crate1::mod1=wrong,crate2="); + assert_eq!(dirs.len(), 1); + assert_eq!(dirs[0].name, Some("crate2".to_string())); + assert_eq!(dirs[0].level, LevelFilter::max()); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_empty_level_isolated() { + // test parse_spec with "" as log level (and the entire spec str) + let (dirs, filter) = parse_spec(""); // should be ignored + assert_eq!(dirs.len(), 0); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_blank_level_isolated() { + // test parse_spec with a white-space-only string specified as the log + // level (and the entire spec str) + let (dirs, filter) = parse_spec(" "); // should be ignored + assert_eq!(dirs.len(), 0); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_blank_level_isolated_comma_only() { + // The spec should contain zero or more comma-separated string slices, + // so a comma-only string should be interpreted as two empty strings + // (which should both be treated as invalid, so ignored). + let (dirs, filter) = parse_spec(","); // should be ignored + assert_eq!(dirs.len(), 0); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_blank_level_isolated_comma_blank() { + // The spec should contain zero or more comma-separated string slices, + // so this bogus spec should be interpreted as containing one empty + // string and one blank string. Both should both be treated as + // invalid, so ignored. + let (dirs, filter) = parse_spec(", "); // should be ignored + assert_eq!(dirs.len(), 0); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_blank_level_isolated_blank_comma() { + // The spec should contain zero or more comma-separated string slices, + // so this bogus spec should be interpreted as containing one blank + // string and one empty string. Both should both be treated as + // invalid, so ignored. + let (dirs, filter) = parse_spec(" ,"); // should be ignored + assert_eq!(dirs.len(), 0); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_global() { + // test parse_spec with no crate + let (dirs, filter) = parse_spec("warn,crate2=debug"); + assert_eq!(dirs.len(), 2); + assert_eq!(dirs[0].name, None); + assert_eq!(dirs[0].level, LevelFilter::Warn); + assert_eq!(dirs[1].name, Some("crate2".to_string())); + assert_eq!(dirs[1].level, LevelFilter::Debug); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_global_bare_warn_lc() { + // test parse_spec with no crate, in isolation, all lowercase + let (dirs, filter) = parse_spec("warn"); + assert_eq!(dirs.len(), 1); + assert_eq!(dirs[0].name, None); + assert_eq!(dirs[0].level, LevelFilter::Warn); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_global_bare_warn_uc() { + // test parse_spec with no crate, in isolation, all uppercase + let (dirs, filter) = parse_spec("WARN"); + assert_eq!(dirs.len(), 1); + assert_eq!(dirs[0].name, None); + assert_eq!(dirs[0].level, LevelFilter::Warn); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_global_bare_warn_mixed() { + // test parse_spec with no crate, in isolation, mixed case + let (dirs, filter) = parse_spec("wArN"); + assert_eq!(dirs.len(), 1); + assert_eq!(dirs[0].name, None); + assert_eq!(dirs[0].level, LevelFilter::Warn); + assert!(filter.is_none()); + } + + #[test] + fn parse_spec_valid_filter() { + let (dirs, filter) = parse_spec("crate1::mod1=error,crate1::mod2,crate2=debug/abc"); + assert_eq!(dirs.len(), 3); + assert_eq!(dirs[0].name, Some("crate1::mod1".to_string())); + assert_eq!(dirs[0].level, LevelFilter::Error); + + assert_eq!(dirs[1].name, Some("crate1::mod2".to_string())); + assert_eq!(dirs[1].level, LevelFilter::max()); + + assert_eq!(dirs[2].name, Some("crate2".to_string())); + assert_eq!(dirs[2].level, LevelFilter::Debug); + assert!(filter.is_some() && filter.unwrap().to_string() == "abc"); + } + + #[test] + fn parse_spec_invalid_crate_filter() { + let (dirs, filter) = parse_spec("crate1::mod1=error=warn,crate2=debug/a.c"); + assert_eq!(dirs.len(), 1); + assert_eq!(dirs[0].name, Some("crate2".to_string())); + assert_eq!(dirs[0].level, LevelFilter::Debug); + assert!(filter.is_some() && filter.unwrap().to_string() == "a.c"); + } + + #[test] + fn parse_spec_empty_with_filter() { + let (dirs, filter) = parse_spec("crate1/a*c"); + assert_eq!(dirs.len(), 1); + assert_eq!(dirs[0].name, Some("crate1".to_string())); + assert_eq!(dirs[0].level, LevelFilter::max()); + assert!(filter.is_some() && filter.unwrap().to_string() == "a*c"); + } +} diff --git a/third_party/rust/env_logger/src/filter/regex.rs b/third_party/rust/env_logger/src/filter/regex.rs new file mode 100644 index 0000000000..fb21528a12 --- /dev/null +++ b/third_party/rust/env_logger/src/filter/regex.rs @@ -0,0 +1,29 @@ +extern crate regex; + +use std::fmt; + +use self::regex::Regex; + +#[derive(Debug)] +pub struct Filter { + inner: Regex, +} + +impl Filter { + pub fn new(spec: &str) -> Result<Filter, String> { + match Regex::new(spec) { + Ok(r) => Ok(Filter { inner: r }), + Err(e) => Err(e.to_string()), + } + } + + pub fn is_match(&self, s: &str) -> bool { + self.inner.is_match(s) + } +} + +impl fmt::Display for Filter { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + self.inner.fmt(f) + } +} diff --git a/third_party/rust/env_logger/src/filter/string.rs b/third_party/rust/env_logger/src/filter/string.rs new file mode 100644 index 0000000000..ea476e42f9 --- /dev/null +++ b/third_party/rust/env_logger/src/filter/string.rs @@ -0,0 +1,24 @@ +use std::fmt; + +#[derive(Debug)] +pub struct Filter { + inner: String, +} + +impl Filter { + pub fn new(spec: &str) -> Result<Filter, String> { + Ok(Filter { + inner: spec.to_string(), + }) + } + + pub fn is_match(&self, s: &str) -> bool { + s.contains(&self.inner) + } +} + +impl fmt::Display for Filter { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + self.inner.fmt(f) + } +} diff --git a/third_party/rust/env_logger/src/fmt/humantime/extern_impl.rs b/third_party/rust/env_logger/src/fmt/humantime/extern_impl.rs new file mode 100644 index 0000000000..bdf165c4eb --- /dev/null +++ b/third_party/rust/env_logger/src/fmt/humantime/extern_impl.rs @@ -0,0 +1,118 @@ +use std::fmt; +use std::time::SystemTime; + +use humantime::{ + format_rfc3339_micros, format_rfc3339_millis, format_rfc3339_nanos, format_rfc3339_seconds, +}; + +use crate::fmt::{Formatter, TimestampPrecision}; + +pub(in crate::fmt) mod glob { + pub use super::*; +} + +impl Formatter { + /// Get a [`Timestamp`] for the current date and time in UTC. + /// + /// # Examples + /// + /// Include the current timestamp with the log record: + /// + /// ``` + /// use std::io::Write; + /// + /// let mut builder = env_logger::Builder::new(); + /// + /// builder.format(|buf, record| { + /// let ts = buf.timestamp(); + /// + /// writeln!(buf, "{}: {}: {}", ts, record.level(), record.args()) + /// }); + /// ``` + /// + /// [`Timestamp`]: struct.Timestamp.html + pub fn timestamp(&self) -> Timestamp { + Timestamp { + time: SystemTime::now(), + precision: TimestampPrecision::Seconds, + } + } + + /// Get a [`Timestamp`] for the current date and time in UTC with full + /// second precision. + pub fn timestamp_seconds(&self) -> Timestamp { + Timestamp { + time: SystemTime::now(), + precision: TimestampPrecision::Seconds, + } + } + + /// Get a [`Timestamp`] for the current date and time in UTC with + /// millisecond precision. + pub fn timestamp_millis(&self) -> Timestamp { + Timestamp { + time: SystemTime::now(), + precision: TimestampPrecision::Millis, + } + } + + /// Get a [`Timestamp`] for the current date and time in UTC with + /// microsecond precision. + pub fn timestamp_micros(&self) -> Timestamp { + Timestamp { + time: SystemTime::now(), + precision: TimestampPrecision::Micros, + } + } + + /// Get a [`Timestamp`] for the current date and time in UTC with + /// nanosecond precision. + pub fn timestamp_nanos(&self) -> Timestamp { + Timestamp { + time: SystemTime::now(), + precision: TimestampPrecision::Nanos, + } + } +} + +/// An [RFC3339] formatted timestamp. +/// +/// The timestamp implements [`Display`] and can be written to a [`Formatter`]. +/// +/// [RFC3339]: https://www.ietf.org/rfc/rfc3339.txt +/// [`Display`]: https://doc.rust-lang.org/stable/std/fmt/trait.Display.html +/// [`Formatter`]: struct.Formatter.html +pub struct Timestamp { + time: SystemTime, + precision: TimestampPrecision, +} + +impl fmt::Debug for Timestamp { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + /// A `Debug` wrapper for `Timestamp` that uses the `Display` implementation. + struct TimestampValue<'a>(&'a Timestamp); + + impl<'a> fmt::Debug for TimestampValue<'a> { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + fmt::Display::fmt(&self.0, f) + } + } + + f.debug_tuple("Timestamp") + .field(&TimestampValue(self)) + .finish() + } +} + +impl fmt::Display for Timestamp { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + let formatter = match self.precision { + TimestampPrecision::Seconds => format_rfc3339_seconds, + TimestampPrecision::Millis => format_rfc3339_millis, + TimestampPrecision::Micros => format_rfc3339_micros, + TimestampPrecision::Nanos => format_rfc3339_nanos, + }; + + formatter(self.time).fmt(f) + } +} diff --git a/third_party/rust/env_logger/src/fmt/humantime/mod.rs b/third_party/rust/env_logger/src/fmt/humantime/mod.rs new file mode 100644 index 0000000000..ac23ae2493 --- /dev/null +++ b/third_party/rust/env_logger/src/fmt/humantime/mod.rs @@ -0,0 +1,11 @@ +/* +This internal module contains the timestamp implementation. + +Its public API is available when the `humantime` crate is available. +*/ + +#[cfg_attr(feature = "humantime", path = "extern_impl.rs")] +#[cfg_attr(not(feature = "humantime"), path = "shim_impl.rs")] +mod imp; + +pub(in crate::fmt) use self::imp::*; diff --git a/third_party/rust/env_logger/src/fmt/humantime/shim_impl.rs b/third_party/rust/env_logger/src/fmt/humantime/shim_impl.rs new file mode 100644 index 0000000000..906bf9e4c1 --- /dev/null +++ b/third_party/rust/env_logger/src/fmt/humantime/shim_impl.rs @@ -0,0 +1,5 @@ +/* +Timestamps aren't available when we don't have a `humantime` dependency. +*/ + +pub(in crate::fmt) mod glob {} diff --git a/third_party/rust/env_logger/src/fmt/mod.rs b/third_party/rust/env_logger/src/fmt/mod.rs new file mode 100644 index 0000000000..86c093f0e0 --- /dev/null +++ b/third_party/rust/env_logger/src/fmt/mod.rs @@ -0,0 +1,652 @@ +//! Formatting for log records. +//! +//! This module contains a [`Formatter`] that can be used to format log records +//! into without needing temporary allocations. Usually you won't need to worry +//! about the contents of this module and can use the `Formatter` like an ordinary +//! [`Write`]. +//! +//! # Formatting log records +//! +//! The format used to print log records can be customised using the [`Builder::format`] +//! method. +//! Custom formats can apply different color and weight to printed values using +//! [`Style`] builders. +//! +//! ``` +//! use std::io::Write; +//! +//! let mut builder = env_logger::Builder::new(); +//! +//! builder.format(|buf, record| { +//! writeln!(buf, "{}: {}", +//! record.level(), +//! record.args()) +//! }); +//! ``` +//! +//! [`Formatter`]: struct.Formatter.html +//! [`Style`]: struct.Style.html +//! [`Builder::format`]: ../struct.Builder.html#method.format +//! [`Write`]: https://doc.rust-lang.org/stable/std/io/trait.Write.html + +use std::cell::RefCell; +use std::fmt::Display; +use std::io::prelude::*; +use std::rc::Rc; +use std::{fmt, io, mem}; + +use log::Record; + +mod humantime; +pub(crate) mod writer; + +pub use self::humantime::glob::*; +pub use self::writer::glob::*; + +use self::writer::{Buffer, Writer}; + +pub(crate) mod glob { + pub use super::{Target, TimestampPrecision, WriteStyle}; +} + +/// Formatting precision of timestamps. +/// +/// Seconds give precision of full seconds, milliseconds give thousands of a +/// second (3 decimal digits), microseconds are millionth of a second (6 decimal +/// digits) and nanoseconds are billionth of a second (9 decimal digits). +#[derive(Copy, Clone, Debug)] +pub enum TimestampPrecision { + /// Full second precision (0 decimal digits) + Seconds, + /// Millisecond precision (3 decimal digits) + Millis, + /// Microsecond precision (6 decimal digits) + Micros, + /// Nanosecond precision (9 decimal digits) + Nanos, +} + +/// The default timestamp precision is seconds. +impl Default for TimestampPrecision { + fn default() -> Self { + TimestampPrecision::Seconds + } +} + +/// A formatter to write logs into. +/// +/// `Formatter` implements the standard [`Write`] trait for writing log records. +/// It also supports terminal colors, through the [`style`] method. +/// +/// # Examples +/// +/// Use the [`writeln`] macro to format a log record. +/// An instance of a `Formatter` is passed to an `env_logger` format as `buf`: +/// +/// ``` +/// use std::io::Write; +/// +/// let mut builder = env_logger::Builder::new(); +/// +/// builder.format(|buf, record| writeln!(buf, "{}: {}", record.level(), record.args())); +/// ``` +/// +/// [`Write`]: https://doc.rust-lang.org/stable/std/io/trait.Write.html +/// [`writeln`]: https://doc.rust-lang.org/stable/std/macro.writeln.html +/// [`style`]: #method.style +pub struct Formatter { + buf: Rc<RefCell<Buffer>>, + write_style: WriteStyle, +} + +impl Formatter { + pub(crate) fn new(writer: &Writer) -> Self { + Formatter { + buf: Rc::new(RefCell::new(writer.buffer())), + write_style: writer.write_style(), + } + } + + pub(crate) fn write_style(&self) -> WriteStyle { + self.write_style + } + + pub(crate) fn print(&self, writer: &Writer) -> io::Result<()> { + writer.print(&self.buf.borrow()) + } + + pub(crate) fn clear(&mut self) { + self.buf.borrow_mut().clear() + } +} + +impl Write for Formatter { + fn write(&mut self, buf: &[u8]) -> io::Result<usize> { + self.buf.borrow_mut().write(buf) + } + + fn flush(&mut self) -> io::Result<()> { + self.buf.borrow_mut().flush() + } +} + +impl fmt::Debug for Formatter { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.debug_struct("Formatter").finish() + } +} + +pub(crate) type FormatFn = Box<dyn Fn(&mut Formatter, &Record) -> io::Result<()> + Sync + Send>; + +pub(crate) struct Builder { + pub format_timestamp: Option<TimestampPrecision>, + pub format_module_path: bool, + pub format_target: bool, + pub format_level: bool, + pub format_indent: Option<usize>, + pub custom_format: Option<FormatFn>, + pub format_suffix: &'static str, + built: bool, +} + +impl Default for Builder { + fn default() -> Self { + Builder { + format_timestamp: Some(Default::default()), + format_module_path: false, + format_target: true, + format_level: true, + format_indent: Some(4), + custom_format: None, + format_suffix: "\n", + built: false, + } + } +} + +impl Builder { + /// Convert the format into a callable function. + /// + /// If the `custom_format` is `Some`, then any `default_format` switches are ignored. + /// If the `custom_format` is `None`, then a default format is returned. + /// Any `default_format` switches set to `false` won't be written by the format. + pub fn build(&mut self) -> FormatFn { + assert!(!self.built, "attempt to re-use consumed builder"); + + let built = mem::replace( + self, + Builder { + built: true, + ..Default::default() + }, + ); + + if let Some(fmt) = built.custom_format { + fmt + } else { + Box::new(move |buf, record| { + let fmt = DefaultFormat { + timestamp: built.format_timestamp, + module_path: built.format_module_path, + target: built.format_target, + level: built.format_level, + written_header_value: false, + indent: built.format_indent, + suffix: built.format_suffix, + buf, + }; + + fmt.write(record) + }) + } + } +} + +#[cfg(feature = "color")] +type SubtleStyle = StyledValue<'static, &'static str>; +#[cfg(not(feature = "color"))] +type SubtleStyle = &'static str; + +/// The default format. +/// +/// This format needs to work with any combination of crate features. +struct DefaultFormat<'a> { + timestamp: Option<TimestampPrecision>, + module_path: bool, + target: bool, + level: bool, + written_header_value: bool, + indent: Option<usize>, + buf: &'a mut Formatter, + suffix: &'a str, +} + +impl<'a> DefaultFormat<'a> { + fn write(mut self, record: &Record) -> io::Result<()> { + self.write_timestamp()?; + self.write_level(record)?; + self.write_module_path(record)?; + self.write_target(record)?; + self.finish_header()?; + + self.write_args(record) + } + + fn subtle_style(&self, text: &'static str) -> SubtleStyle { + #[cfg(feature = "color")] + { + self.buf + .style() + .set_color(Color::Black) + .set_intense(true) + .clone() + .into_value(text) + } + #[cfg(not(feature = "color"))] + { + text + } + } + + fn write_header_value<T>(&mut self, value: T) -> io::Result<()> + where + T: Display, + { + if !self.written_header_value { + self.written_header_value = true; + + let open_brace = self.subtle_style("["); + write!(self.buf, "{}{}", open_brace, value) + } else { + write!(self.buf, " {}", value) + } + } + + fn write_level(&mut self, record: &Record) -> io::Result<()> { + if !self.level { + return Ok(()); + } + + let level = { + #[cfg(feature = "color")] + { + self.buf.default_styled_level(record.level()) + } + #[cfg(not(feature = "color"))] + { + record.level() + } + }; + + self.write_header_value(format_args!("{:<5}", level)) + } + + fn write_timestamp(&mut self) -> io::Result<()> { + #[cfg(feature = "humantime")] + { + use self::TimestampPrecision::*; + let ts = match self.timestamp { + None => return Ok(()), + Some(Seconds) => self.buf.timestamp_seconds(), + Some(Millis) => self.buf.timestamp_millis(), + Some(Micros) => self.buf.timestamp_micros(), + Some(Nanos) => self.buf.timestamp_nanos(), + }; + + self.write_header_value(ts) + } + #[cfg(not(feature = "humantime"))] + { + // Trick the compiler to think we have used self.timestamp + // Workaround for "field is never used: `timestamp`" compiler nag. + let _ = self.timestamp; + Ok(()) + } + } + + fn write_module_path(&mut self, record: &Record) -> io::Result<()> { + if !self.module_path { + return Ok(()); + } + + if let Some(module_path) = record.module_path() { + self.write_header_value(module_path) + } else { + Ok(()) + } + } + + fn write_target(&mut self, record: &Record) -> io::Result<()> { + if !self.target { + return Ok(()); + } + + match record.target() { + "" => Ok(()), + target => self.write_header_value(target), + } + } + + fn finish_header(&mut self) -> io::Result<()> { + if self.written_header_value { + let close_brace = self.subtle_style("]"); + write!(self.buf, "{} ", close_brace) + } else { + Ok(()) + } + } + + fn write_args(&mut self, record: &Record) -> io::Result<()> { + match self.indent { + // Fast path for no indentation + None => write!(self.buf, "{}{}", record.args(), self.suffix), + + Some(indent_count) => { + // Create a wrapper around the buffer only if we have to actually indent the message + + struct IndentWrapper<'a, 'b: 'a> { + fmt: &'a mut DefaultFormat<'b>, + indent_count: usize, + } + + impl<'a, 'b> Write for IndentWrapper<'a, 'b> { + fn write(&mut self, buf: &[u8]) -> io::Result<usize> { + let mut first = true; + for chunk in buf.split(|&x| x == b'\n') { + if !first { + write!( + self.fmt.buf, + "{}{:width$}", + self.fmt.suffix, + "", + width = self.indent_count + )?; + } + self.fmt.buf.write_all(chunk)?; + first = false; + } + + Ok(buf.len()) + } + + fn flush(&mut self) -> io::Result<()> { + self.fmt.buf.flush() + } + } + + // The explicit scope here is just to make older versions of Rust happy + { + let mut wrapper = IndentWrapper { + fmt: self, + indent_count, + }; + write!(wrapper, "{}", record.args())?; + } + + write!(self.buf, "{}", self.suffix)?; + + Ok(()) + } + } + } +} + +#[cfg(test)] +mod tests { + use super::*; + + use log::{Level, Record}; + + fn write_record(record: Record, fmt: DefaultFormat) -> String { + let buf = fmt.buf.buf.clone(); + + fmt.write(&record).expect("failed to write record"); + + let buf = buf.borrow(); + String::from_utf8(buf.bytes().to_vec()).expect("failed to read record") + } + + fn write_target(target: &str, fmt: DefaultFormat) -> String { + write_record( + Record::builder() + .args(format_args!("log\nmessage")) + .level(Level::Info) + .file(Some("test.rs")) + .line(Some(144)) + .module_path(Some("test::path")) + .target(target) + .build(), + fmt, + ) + } + + fn write(fmt: DefaultFormat) -> String { + write_target("", fmt) + } + + #[test] + fn format_with_header() { + let writer = writer::Builder::new() + .write_style(WriteStyle::Never) + .build(); + + let mut f = Formatter::new(&writer); + + let written = write(DefaultFormat { + timestamp: None, + module_path: true, + target: false, + level: true, + written_header_value: false, + indent: None, + suffix: "\n", + buf: &mut f, + }); + + assert_eq!("[INFO test::path] log\nmessage\n", written); + } + + #[test] + fn format_no_header() { + let writer = writer::Builder::new() + .write_style(WriteStyle::Never) + .build(); + + let mut f = Formatter::new(&writer); + + let written = write(DefaultFormat { + timestamp: None, + module_path: false, + target: false, + level: false, + written_header_value: false, + indent: None, + suffix: "\n", + buf: &mut f, + }); + + assert_eq!("log\nmessage\n", written); + } + + #[test] + fn format_indent_spaces() { + let writer = writer::Builder::new() + .write_style(WriteStyle::Never) + .build(); + + let mut f = Formatter::new(&writer); + + let written = write(DefaultFormat { + timestamp: None, + module_path: true, + target: false, + level: true, + written_header_value: false, + indent: Some(4), + suffix: "\n", + buf: &mut f, + }); + + assert_eq!("[INFO test::path] log\n message\n", written); + } + + #[test] + fn format_indent_zero_spaces() { + let writer = writer::Builder::new() + .write_style(WriteStyle::Never) + .build(); + + let mut f = Formatter::new(&writer); + + let written = write(DefaultFormat { + timestamp: None, + module_path: true, + target: false, + level: true, + written_header_value: false, + indent: Some(0), + suffix: "\n", + buf: &mut f, + }); + + assert_eq!("[INFO test::path] log\nmessage\n", written); + } + + #[test] + fn format_indent_spaces_no_header() { + let writer = writer::Builder::new() + .write_style(WriteStyle::Never) + .build(); + + let mut f = Formatter::new(&writer); + + let written = write(DefaultFormat { + timestamp: None, + module_path: false, + target: false, + level: false, + written_header_value: false, + indent: Some(4), + suffix: "\n", + buf: &mut f, + }); + + assert_eq!("log\n message\n", written); + } + + #[test] + fn format_suffix() { + let writer = writer::Builder::new() + .write_style(WriteStyle::Never) + .build(); + + let mut f = Formatter::new(&writer); + + let written = write(DefaultFormat { + timestamp: None, + module_path: false, + target: false, + level: false, + written_header_value: false, + indent: None, + suffix: "\n\n", + buf: &mut f, + }); + + assert_eq!("log\nmessage\n\n", written); + } + + #[test] + fn format_suffix_with_indent() { + let writer = writer::Builder::new() + .write_style(WriteStyle::Never) + .build(); + + let mut f = Formatter::new(&writer); + + let written = write(DefaultFormat { + timestamp: None, + module_path: false, + target: false, + level: false, + written_header_value: false, + indent: Some(4), + suffix: "\n\n", + buf: &mut f, + }); + + assert_eq!("log\n\n message\n\n", written); + } + + #[test] + fn format_target() { + let writer = writer::Builder::new() + .write_style(WriteStyle::Never) + .build(); + + let mut f = Formatter::new(&writer); + + let written = write_target( + "target", + DefaultFormat { + timestamp: None, + module_path: true, + target: true, + level: true, + written_header_value: false, + indent: None, + suffix: "\n", + buf: &mut f, + }, + ); + + assert_eq!("[INFO test::path target] log\nmessage\n", written); + } + + #[test] + fn format_empty_target() { + let writer = writer::Builder::new() + .write_style(WriteStyle::Never) + .build(); + + let mut f = Formatter::new(&writer); + + let written = write(DefaultFormat { + timestamp: None, + module_path: true, + target: true, + level: true, + written_header_value: false, + indent: None, + suffix: "\n", + buf: &mut f, + }); + + assert_eq!("[INFO test::path] log\nmessage\n", written); + } + + #[test] + fn format_no_target() { + let writer = writer::Builder::new() + .write_style(WriteStyle::Never) + .build(); + + let mut f = Formatter::new(&writer); + + let written = write_target( + "target", + DefaultFormat { + timestamp: None, + module_path: true, + target: false, + level: true, + written_header_value: false, + indent: None, + suffix: "\n", + buf: &mut f, + }, + ); + + assert_eq!("[INFO test::path] log\nmessage\n", written); + } +} diff --git a/third_party/rust/env_logger/src/fmt/writer/atty.rs b/third_party/rust/env_logger/src/fmt/writer/atty.rs new file mode 100644 index 0000000000..1a133eeff7 --- /dev/null +++ b/third_party/rust/env_logger/src/fmt/writer/atty.rs @@ -0,0 +1,33 @@ +/* +This internal module contains the terminal detection implementation. + +If the `auto-color` feature is enabled then we detect whether we're attached to a particular TTY. +Otherwise, assume we're not attached to anything. This effectively prevents styles from being +printed. +*/ + +#[cfg(feature = "auto-color")] +mod imp { + use is_terminal::IsTerminal; + + pub(in crate::fmt) fn is_stdout() -> bool { + std::io::stdout().is_terminal() + } + + pub(in crate::fmt) fn is_stderr() -> bool { + std::io::stderr().is_terminal() + } +} + +#[cfg(not(feature = "auto-color"))] +mod imp { + pub(in crate::fmt) fn is_stdout() -> bool { + false + } + + pub(in crate::fmt) fn is_stderr() -> bool { + false + } +} + +pub(in crate::fmt) use self::imp::*; diff --git a/third_party/rust/env_logger/src/fmt/writer/mod.rs b/third_party/rust/env_logger/src/fmt/writer/mod.rs new file mode 100644 index 0000000000..7f4b6f9495 --- /dev/null +++ b/third_party/rust/env_logger/src/fmt/writer/mod.rs @@ -0,0 +1,253 @@ +mod atty; +mod termcolor; + +use self::atty::{is_stderr, is_stdout}; +use self::termcolor::BufferWriter; +use std::{fmt, io, mem, sync::Mutex}; + +pub(super) mod glob { + pub use super::termcolor::glob::*; + pub use super::*; +} + +pub(super) use self::termcolor::Buffer; + +/// Log target, either `stdout`, `stderr` or a custom pipe. +#[non_exhaustive] +pub enum Target { + /// Logs will be sent to standard output. + Stdout, + /// Logs will be sent to standard error. + Stderr, + /// Logs will be sent to a custom pipe. + Pipe(Box<dyn io::Write + Send + 'static>), +} + +impl Default for Target { + fn default() -> Self { + Target::Stderr + } +} + +impl fmt::Debug for Target { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!( + f, + "{}", + match self { + Self::Stdout => "stdout", + Self::Stderr => "stderr", + Self::Pipe(_) => "pipe", + } + ) + } +} + +/// Log target, either `stdout`, `stderr` or a custom pipe. +/// +/// Same as `Target`, except the pipe is wrapped in a mutex for interior mutability. +pub(super) enum WritableTarget { + /// Logs will be sent to standard output. + Stdout, + /// Logs will be sent to standard error. + Stderr, + /// Logs will be sent to a custom pipe. + Pipe(Box<Mutex<dyn io::Write + Send + 'static>>), +} + +impl From<Target> for WritableTarget { + fn from(target: Target) -> Self { + match target { + Target::Stdout => Self::Stdout, + Target::Stderr => Self::Stderr, + Target::Pipe(pipe) => Self::Pipe(Box::new(Mutex::new(pipe))), + } + } +} + +impl Default for WritableTarget { + fn default() -> Self { + Self::from(Target::default()) + } +} + +impl fmt::Debug for WritableTarget { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!( + f, + "{}", + match self { + Self::Stdout => "stdout", + Self::Stderr => "stderr", + Self::Pipe(_) => "pipe", + } + ) + } +} +/// Whether or not to print styles to the target. +#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)] +pub enum WriteStyle { + /// Try to print styles, but don't force the issue. + Auto, + /// Try very hard to print styles. + Always, + /// Never print styles. + Never, +} + +impl Default for WriteStyle { + fn default() -> Self { + WriteStyle::Auto + } +} + +/// A terminal target with color awareness. +pub(crate) struct Writer { + inner: BufferWriter, + write_style: WriteStyle, +} + +impl Writer { + pub fn write_style(&self) -> WriteStyle { + self.write_style + } + + pub(super) fn buffer(&self) -> Buffer { + self.inner.buffer() + } + + pub(super) fn print(&self, buf: &Buffer) -> io::Result<()> { + self.inner.print(buf) + } +} + +/// A builder for a terminal writer. +/// +/// The target and style choice can be configured before building. +#[derive(Debug)] +pub(crate) struct Builder { + target: WritableTarget, + write_style: WriteStyle, + is_test: bool, + built: bool, +} + +impl Builder { + /// Initialize the writer builder with defaults. + pub(crate) fn new() -> Self { + Builder { + target: Default::default(), + write_style: Default::default(), + is_test: false, + built: false, + } + } + + /// Set the target to write to. + pub(crate) fn target(&mut self, target: Target) -> &mut Self { + self.target = target.into(); + self + } + + /// Parses a style choice string. + /// + /// See the [Disabling colors] section for more details. + /// + /// [Disabling colors]: ../index.html#disabling-colors + pub(crate) fn parse_write_style(&mut self, write_style: &str) -> &mut Self { + self.write_style(parse_write_style(write_style)) + } + + /// Whether or not to print style characters when writing. + pub(crate) fn write_style(&mut self, write_style: WriteStyle) -> &mut Self { + self.write_style = write_style; + self + } + + /// Whether or not to capture logs for `cargo test`. + #[allow(clippy::wrong_self_convention)] + pub(crate) fn is_test(&mut self, is_test: bool) -> &mut Self { + self.is_test = is_test; + self + } + + /// Build a terminal writer. + pub(crate) fn build(&mut self) -> Writer { + assert!(!self.built, "attempt to re-use consumed builder"); + self.built = true; + + let color_choice = match self.write_style { + WriteStyle::Auto => { + if match &self.target { + WritableTarget::Stderr => is_stderr(), + WritableTarget::Stdout => is_stdout(), + WritableTarget::Pipe(_) => false, + } { + WriteStyle::Auto + } else { + WriteStyle::Never + } + } + color_choice => color_choice, + }; + + let writer = match mem::take(&mut self.target) { + WritableTarget::Stderr => BufferWriter::stderr(self.is_test, color_choice), + WritableTarget::Stdout => BufferWriter::stdout(self.is_test, color_choice), + WritableTarget::Pipe(pipe) => BufferWriter::pipe(color_choice, pipe), + }; + + Writer { + inner: writer, + write_style: self.write_style, + } + } +} + +impl Default for Builder { + fn default() -> Self { + Builder::new() + } +} + +impl fmt::Debug for Writer { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.debug_struct("Writer").finish() + } +} + +fn parse_write_style(spec: &str) -> WriteStyle { + match spec { + "auto" => WriteStyle::Auto, + "always" => WriteStyle::Always, + "never" => WriteStyle::Never, + _ => Default::default(), + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn parse_write_style_valid() { + let inputs = vec![ + ("auto", WriteStyle::Auto), + ("always", WriteStyle::Always), + ("never", WriteStyle::Never), + ]; + + for (input, expected) in inputs { + assert_eq!(expected, parse_write_style(input)); + } + } + + #[test] + fn parse_write_style_invalid() { + let inputs = vec!["", "true", "false", "NEVER!!"]; + + for input in inputs { + assert_eq!(WriteStyle::Auto, parse_write_style(input)); + } + } +} diff --git a/third_party/rust/env_logger/src/fmt/writer/termcolor/extern_impl.rs b/third_party/rust/env_logger/src/fmt/writer/termcolor/extern_impl.rs new file mode 100644 index 0000000000..89c382239c --- /dev/null +++ b/third_party/rust/env_logger/src/fmt/writer/termcolor/extern_impl.rs @@ -0,0 +1,532 @@ +use std::borrow::Cow; +use std::cell::RefCell; +use std::fmt; +use std::io::{self, Write}; +use std::rc::Rc; +use std::sync::Mutex; + +use log::Level; +use termcolor::{self, ColorChoice, ColorSpec, WriteColor}; + +use crate::fmt::{Formatter, WritableTarget, WriteStyle}; + +pub(in crate::fmt::writer) mod glob { + pub use super::*; +} + +impl Formatter { + /// Begin a new [`Style`]. + /// + /// # Examples + /// + /// Create a bold, red colored style and use it to print the log level: + /// + /// ``` + /// use std::io::Write; + /// use env_logger::fmt::Color; + /// + /// let mut builder = env_logger::Builder::new(); + /// + /// builder.format(|buf, record| { + /// let mut level_style = buf.style(); + /// + /// level_style.set_color(Color::Red).set_bold(true); + /// + /// writeln!(buf, "{}: {}", + /// level_style.value(record.level()), + /// record.args()) + /// }); + /// ``` + /// + /// [`Style`]: struct.Style.html + pub fn style(&self) -> Style { + Style { + buf: self.buf.clone(), + spec: ColorSpec::new(), + } + } + + /// Get the default [`Style`] for the given level. + /// + /// The style can be used to print other values besides the level. + pub fn default_level_style(&self, level: Level) -> Style { + let mut level_style = self.style(); + match level { + Level::Trace => level_style.set_color(Color::Cyan), + Level::Debug => level_style.set_color(Color::Blue), + Level::Info => level_style.set_color(Color::Green), + Level::Warn => level_style.set_color(Color::Yellow), + Level::Error => level_style.set_color(Color::Red).set_bold(true), + }; + level_style + } + + /// Get a printable [`Style`] for the given level. + /// + /// The style can only be used to print the level. + pub fn default_styled_level(&self, level: Level) -> StyledValue<'static, Level> { + self.default_level_style(level).into_value(level) + } +} + +pub(in crate::fmt::writer) struct BufferWriter { + inner: termcolor::BufferWriter, + uncolored_target: Option<WritableTarget>, +} + +pub(in crate::fmt) struct Buffer { + inner: termcolor::Buffer, + has_uncolored_target: bool, +} + +impl BufferWriter { + pub(in crate::fmt::writer) fn stderr(is_test: bool, write_style: WriteStyle) -> Self { + BufferWriter { + inner: termcolor::BufferWriter::stderr(write_style.into_color_choice()), + uncolored_target: if is_test { + Some(WritableTarget::Stderr) + } else { + None + }, + } + } + + pub(in crate::fmt::writer) fn stdout(is_test: bool, write_style: WriteStyle) -> Self { + BufferWriter { + inner: termcolor::BufferWriter::stdout(write_style.into_color_choice()), + uncolored_target: if is_test { + Some(WritableTarget::Stdout) + } else { + None + }, + } + } + + pub(in crate::fmt::writer) fn pipe( + write_style: WriteStyle, + pipe: Box<Mutex<dyn io::Write + Send + 'static>>, + ) -> Self { + BufferWriter { + // The inner Buffer is never printed from, but it is still needed to handle coloring and other formatting + inner: termcolor::BufferWriter::stderr(write_style.into_color_choice()), + uncolored_target: Some(WritableTarget::Pipe(pipe)), + } + } + + pub(in crate::fmt::writer) fn buffer(&self) -> Buffer { + Buffer { + inner: self.inner.buffer(), + has_uncolored_target: self.uncolored_target.is_some(), + } + } + + pub(in crate::fmt::writer) fn print(&self, buf: &Buffer) -> io::Result<()> { + if let Some(target) = &self.uncolored_target { + // This impl uses the `eprint` and `print` macros + // instead of `termcolor`'s buffer. + // This is so their output can be captured by `cargo test` + let log = String::from_utf8_lossy(buf.bytes()); + + match target { + WritableTarget::Stderr => eprint!("{}", log), + WritableTarget::Stdout => print!("{}", log), + WritableTarget::Pipe(pipe) => write!(pipe.lock().unwrap(), "{}", log)?, + } + + Ok(()) + } else { + self.inner.print(&buf.inner) + } + } +} + +impl Buffer { + pub(in crate::fmt) fn clear(&mut self) { + self.inner.clear() + } + + pub(in crate::fmt) fn write(&mut self, buf: &[u8]) -> io::Result<usize> { + self.inner.write(buf) + } + + pub(in crate::fmt) fn flush(&mut self) -> io::Result<()> { + self.inner.flush() + } + + pub(in crate::fmt) fn bytes(&self) -> &[u8] { + self.inner.as_slice() + } + + fn set_color(&mut self, spec: &ColorSpec) -> io::Result<()> { + // Ignore styles for test captured logs because they can't be printed + if !self.has_uncolored_target { + self.inner.set_color(spec) + } else { + Ok(()) + } + } + + fn reset(&mut self) -> io::Result<()> { + // Ignore styles for test captured logs because they can't be printed + if !self.has_uncolored_target { + self.inner.reset() + } else { + Ok(()) + } + } +} + +impl WriteStyle { + fn into_color_choice(self) -> ColorChoice { + match self { + WriteStyle::Always => ColorChoice::Always, + WriteStyle::Auto => ColorChoice::Auto, + WriteStyle::Never => ColorChoice::Never, + } + } +} + +/// A set of styles to apply to the terminal output. +/// +/// Call [`Formatter::style`] to get a `Style` and use the builder methods to +/// set styling properties, like [color] and [weight]. +/// To print a value using the style, wrap it in a call to [`value`] when the log +/// record is formatted. +/// +/// # Examples +/// +/// Create a bold, red colored style and use it to print the log level: +/// +/// ``` +/// use std::io::Write; +/// use env_logger::fmt::Color; +/// +/// let mut builder = env_logger::Builder::new(); +/// +/// builder.format(|buf, record| { +/// let mut level_style = buf.style(); +/// +/// level_style.set_color(Color::Red).set_bold(true); +/// +/// writeln!(buf, "{}: {}", +/// level_style.value(record.level()), +/// record.args()) +/// }); +/// ``` +/// +/// Styles can be re-used to output multiple values: +/// +/// ``` +/// use std::io::Write; +/// use env_logger::fmt::Color; +/// +/// let mut builder = env_logger::Builder::new(); +/// +/// builder.format(|buf, record| { +/// let mut bold = buf.style(); +/// +/// bold.set_bold(true); +/// +/// writeln!(buf, "{}: {} {}", +/// bold.value(record.level()), +/// bold.value("some bold text"), +/// record.args()) +/// }); +/// ``` +/// +/// [`Formatter::style`]: struct.Formatter.html#method.style +/// [color]: #method.set_color +/// [weight]: #method.set_bold +/// [`value`]: #method.value +#[derive(Clone)] +pub struct Style { + buf: Rc<RefCell<Buffer>>, + spec: ColorSpec, +} + +/// A value that can be printed using the given styles. +/// +/// It is the result of calling [`Style::value`]. +/// +/// [`Style::value`]: struct.Style.html#method.value +pub struct StyledValue<'a, T> { + style: Cow<'a, Style>, + value: T, +} + +impl Style { + /// Set the text color. + /// + /// # Examples + /// + /// Create a style with red text: + /// + /// ``` + /// use std::io::Write; + /// use env_logger::fmt::Color; + /// + /// let mut builder = env_logger::Builder::new(); + /// + /// builder.format(|buf, record| { + /// let mut style = buf.style(); + /// + /// style.set_color(Color::Red); + /// + /// writeln!(buf, "{}", style.value(record.args())) + /// }); + /// ``` + pub fn set_color(&mut self, color: Color) -> &mut Style { + self.spec.set_fg(Some(color.into_termcolor())); + self + } + + /// Set the text weight. + /// + /// If `yes` is true then text will be written in bold. + /// If `yes` is false then text will be written in the default weight. + /// + /// # Examples + /// + /// Create a style with bold text: + /// + /// ``` + /// use std::io::Write; + /// + /// let mut builder = env_logger::Builder::new(); + /// + /// builder.format(|buf, record| { + /// let mut style = buf.style(); + /// + /// style.set_bold(true); + /// + /// writeln!(buf, "{}", style.value(record.args())) + /// }); + /// ``` + pub fn set_bold(&mut self, yes: bool) -> &mut Style { + self.spec.set_bold(yes); + self + } + + /// Set the text intensity. + /// + /// If `yes` is true then text will be written in a brighter color. + /// If `yes` is false then text will be written in the default color. + /// + /// # Examples + /// + /// Create a style with intense text: + /// + /// ``` + /// use std::io::Write; + /// + /// let mut builder = env_logger::Builder::new(); + /// + /// builder.format(|buf, record| { + /// let mut style = buf.style(); + /// + /// style.set_intense(true); + /// + /// writeln!(buf, "{}", style.value(record.args())) + /// }); + /// ``` + pub fn set_intense(&mut self, yes: bool) -> &mut Style { + self.spec.set_intense(yes); + self + } + + /// Set whether the text is dimmed. + /// + /// If `yes` is true then text will be written in a dimmer color. + /// If `yes` is false then text will be written in the default color. + /// + /// # Examples + /// + /// Create a style with dimmed text: + /// + /// ``` + /// use std::io::Write; + /// + /// let mut builder = env_logger::Builder::new(); + /// + /// builder.format(|buf, record| { + /// let mut style = buf.style(); + /// + /// style.set_dimmed(true); + /// + /// writeln!(buf, "{}", style.value(record.args())) + /// }); + /// ``` + pub fn set_dimmed(&mut self, yes: bool) -> &mut Style { + self.spec.set_dimmed(yes); + self + } + + /// Set the background color. + /// + /// # Examples + /// + /// Create a style with a yellow background: + /// + /// ``` + /// use std::io::Write; + /// use env_logger::fmt::Color; + /// + /// let mut builder = env_logger::Builder::new(); + /// + /// builder.format(|buf, record| { + /// let mut style = buf.style(); + /// + /// style.set_bg(Color::Yellow); + /// + /// writeln!(buf, "{}", style.value(record.args())) + /// }); + /// ``` + pub fn set_bg(&mut self, color: Color) -> &mut Style { + self.spec.set_bg(Some(color.into_termcolor())); + self + } + + /// Wrap a value in the style. + /// + /// The same `Style` can be used to print multiple different values. + /// + /// # Examples + /// + /// Create a bold, red colored style and use it to print the log level: + /// + /// ``` + /// use std::io::Write; + /// use env_logger::fmt::Color; + /// + /// let mut builder = env_logger::Builder::new(); + /// + /// builder.format(|buf, record| { + /// let mut style = buf.style(); + /// + /// style.set_color(Color::Red).set_bold(true); + /// + /// writeln!(buf, "{}: {}", + /// style.value(record.level()), + /// record.args()) + /// }); + /// ``` + pub fn value<T>(&self, value: T) -> StyledValue<T> { + StyledValue { + style: Cow::Borrowed(self), + value, + } + } + + /// Wrap a value in the style by taking ownership of it. + pub(crate) fn into_value<T>(self, value: T) -> StyledValue<'static, T> { + StyledValue { + style: Cow::Owned(self), + value, + } + } +} + +impl<'a, T> StyledValue<'a, T> { + fn write_fmt<F>(&self, f: F) -> fmt::Result + where + F: FnOnce() -> fmt::Result, + { + self.style + .buf + .borrow_mut() + .set_color(&self.style.spec) + .map_err(|_| fmt::Error)?; + + // Always try to reset the terminal style, even if writing failed + let write = f(); + let reset = self.style.buf.borrow_mut().reset().map_err(|_| fmt::Error); + + write.and(reset) + } +} + +impl fmt::Debug for Style { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.debug_struct("Style").field("spec", &self.spec).finish() + } +} + +macro_rules! impl_styled_value_fmt { + ($($fmt_trait:path),*) => { + $( + impl<'a, T: $fmt_trait> $fmt_trait for StyledValue<'a, T> { + fn fmt(&self, f: &mut fmt::Formatter)->fmt::Result { + self.write_fmt(|| T::fmt(&self.value, f)) + } + } + )* + }; +} + +impl_styled_value_fmt!( + fmt::Debug, + fmt::Display, + fmt::Pointer, + fmt::Octal, + fmt::Binary, + fmt::UpperHex, + fmt::LowerHex, + fmt::UpperExp, + fmt::LowerExp +); + +// The `Color` type is copied from https://github.com/BurntSushi/termcolor + +/// The set of available colors for the terminal foreground/background. +/// +/// The `Ansi256` and `Rgb` colors will only output the correct codes when +/// paired with the `Ansi` `WriteColor` implementation. +/// +/// The `Ansi256` and `Rgb` color types are not supported when writing colors +/// on Windows using the console. If they are used on Windows, then they are +/// silently ignored and no colors will be emitted. +/// +/// This set may expand over time. +/// +/// This type has a `FromStr` impl that can parse colors from their human +/// readable form. The format is as follows: +/// +/// 1. Any of the explicitly listed colors in English. They are matched +/// case insensitively. +/// 2. A single 8-bit integer, in either decimal or hexadecimal format. +/// 3. A triple of 8-bit integers separated by a comma, where each integer is +/// in decimal or hexadecimal format. +/// +/// Hexadecimal numbers are written with a `0x` prefix. +#[allow(missing_docs)] +#[non_exhaustive] +#[derive(Clone, Debug, Eq, PartialEq)] +pub enum Color { + Black, + Blue, + Green, + Red, + Cyan, + Magenta, + Yellow, + White, + Ansi256(u8), + Rgb(u8, u8, u8), +} + +impl Color { + fn into_termcolor(self) -> termcolor::Color { + match self { + Color::Black => termcolor::Color::Black, + Color::Blue => termcolor::Color::Blue, + Color::Green => termcolor::Color::Green, + Color::Red => termcolor::Color::Red, + Color::Cyan => termcolor::Color::Cyan, + Color::Magenta => termcolor::Color::Magenta, + Color::Yellow => termcolor::Color::Yellow, + Color::White => termcolor::Color::White, + Color::Ansi256(value) => termcolor::Color::Ansi256(value), + Color::Rgb(r, g, b) => termcolor::Color::Rgb(r, g, b), + } + } +} diff --git a/third_party/rust/env_logger/src/fmt/writer/termcolor/mod.rs b/third_party/rust/env_logger/src/fmt/writer/termcolor/mod.rs new file mode 100644 index 0000000000..20f01979e6 --- /dev/null +++ b/third_party/rust/env_logger/src/fmt/writer/termcolor/mod.rs @@ -0,0 +1,12 @@ +/* +This internal module contains the style and terminal writing implementation. + +Its public API is available when the `termcolor` crate is available. +The terminal printing is shimmed when the `termcolor` crate is not available. +*/ + +#[cfg_attr(feature = "color", path = "extern_impl.rs")] +#[cfg_attr(not(feature = "color"), path = "shim_impl.rs")] +mod imp; + +pub(in crate::fmt) use self::imp::*; diff --git a/third_party/rust/env_logger/src/fmt/writer/termcolor/shim_impl.rs b/third_party/rust/env_logger/src/fmt/writer/termcolor/shim_impl.rs new file mode 100644 index 0000000000..0705770c95 --- /dev/null +++ b/third_party/rust/env_logger/src/fmt/writer/termcolor/shim_impl.rs @@ -0,0 +1,72 @@ +use std::{io, sync::Mutex}; + +use crate::fmt::{WritableTarget, WriteStyle}; + +pub(in crate::fmt::writer) mod glob {} + +pub(in crate::fmt::writer) struct BufferWriter { + target: WritableTarget, +} + +pub(in crate::fmt) struct Buffer(Vec<u8>); + +impl BufferWriter { + pub(in crate::fmt::writer) fn stderr(_is_test: bool, _write_style: WriteStyle) -> Self { + BufferWriter { + target: WritableTarget::Stderr, + } + } + + pub(in crate::fmt::writer) fn stdout(_is_test: bool, _write_style: WriteStyle) -> Self { + BufferWriter { + target: WritableTarget::Stdout, + } + } + + pub(in crate::fmt::writer) fn pipe( + _write_style: WriteStyle, + pipe: Box<Mutex<dyn io::Write + Send + 'static>>, + ) -> Self { + BufferWriter { + target: WritableTarget::Pipe(pipe), + } + } + + pub(in crate::fmt::writer) fn buffer(&self) -> Buffer { + Buffer(Vec::new()) + } + + pub(in crate::fmt::writer) fn print(&self, buf: &Buffer) -> io::Result<()> { + // This impl uses the `eprint` and `print` macros + // instead of using the streams directly. + // This is so their output can be captured by `cargo test`. + match &self.target { + // Safety: If the target type is `Pipe`, `target_pipe` will always be non-empty. + WritableTarget::Pipe(pipe) => pipe.lock().unwrap().write_all(&buf.0)?, + WritableTarget::Stdout => print!("{}", String::from_utf8_lossy(&buf.0)), + WritableTarget::Stderr => eprint!("{}", String::from_utf8_lossy(&buf.0)), + } + + Ok(()) + } +} + +impl Buffer { + pub(in crate::fmt) fn clear(&mut self) { + self.0.clear(); + } + + pub(in crate::fmt) fn write(&mut self, buf: &[u8]) -> io::Result<usize> { + self.0.extend(buf); + Ok(buf.len()) + } + + pub(in crate::fmt) fn flush(&mut self) -> io::Result<()> { + Ok(()) + } + + #[cfg(test)] + pub(in crate::fmt) fn bytes(&self) -> &[u8] { + &self.0 + } +} diff --git a/third_party/rust/env_logger/src/lib.rs b/third_party/rust/env_logger/src/lib.rs new file mode 100644 index 0000000000..59fa2a3e1d --- /dev/null +++ b/third_party/rust/env_logger/src/lib.rs @@ -0,0 +1,1311 @@ +// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or +// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license +// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +//! A simple logger that can be configured via environment variables, for use +//! with the logging facade exposed by the [`log` crate][log-crate-url]. +//! +//! Despite having "env" in its name, **`env_logger`** can also be configured by +//! other means besides environment variables. See [the examples][gh-repo-examples] +//! in the source repository for more approaches. +//! +//! By default, `env_logger` writes logs to `stderr`, but can be configured to +//! instead write them to `stdout`. +//! +//! ## Example +//! +//! ``` +//! use log::{debug, error, log_enabled, info, Level}; +//! +//! env_logger::init(); +//! +//! debug!("this is a debug {}", "message"); +//! error!("this is printed by default"); +//! +//! if log_enabled!(Level::Info) { +//! let x = 3 * 4; // expensive computation +//! info!("the answer was: {}", x); +//! } +//! ``` +//! +//! Assumes the binary is `main`: +//! +//! ```{.bash} +//! $ RUST_LOG=error ./main +//! [2017-11-09T02:12:24Z ERROR main] this is printed by default +//! ``` +//! +//! ```{.bash} +//! $ RUST_LOG=info ./main +//! [2017-11-09T02:12:24Z ERROR main] this is printed by default +//! [2017-11-09T02:12:24Z INFO main] the answer was: 12 +//! ``` +//! +//! ```{.bash} +//! $ RUST_LOG=debug ./main +//! [2017-11-09T02:12:24Z DEBUG main] this is a debug message +//! [2017-11-09T02:12:24Z ERROR main] this is printed by default +//! [2017-11-09T02:12:24Z INFO main] the answer was: 12 +//! ``` +//! +//! You can also set the log level on a per module basis: +//! +//! ```{.bash} +//! $ RUST_LOG=main=info ./main +//! [2017-11-09T02:12:24Z ERROR main] this is printed by default +//! [2017-11-09T02:12:24Z INFO main] the answer was: 12 +//! ``` +//! +//! And enable all logging: +//! +//! ```{.bash} +//! $ RUST_LOG=main ./main +//! [2017-11-09T02:12:24Z DEBUG main] this is a debug message +//! [2017-11-09T02:12:24Z ERROR main] this is printed by default +//! [2017-11-09T02:12:24Z INFO main] the answer was: 12 +//! ``` +//! +//! If the binary name contains hyphens, you will need to replace +//! them with underscores: +//! +//! ```{.bash} +//! $ RUST_LOG=my_app ./my-app +//! [2017-11-09T02:12:24Z DEBUG my_app] this is a debug message +//! [2017-11-09T02:12:24Z ERROR my_app] this is printed by default +//! [2017-11-09T02:12:24Z INFO my_app] the answer was: 12 +//! ``` +//! +//! This is because Rust modules and crates cannot contain hyphens +//! in their name, although `cargo` continues to accept them. +//! +//! See the documentation for the [`log` crate][log-crate-url] for more +//! information about its API. +//! +//! ## Enabling logging +//! +//! Log levels are controlled on a per-module basis, and **by default all +//! logging is disabled except for the `error` level**. +//! +//! Logging is controlled via the **`RUST_LOG`** environment variable. The +//! value of this environment variable is a comma-separated list of *logging +//! directives*. A logging directive is of the form: +//! +//! ```text +//! example::log::target=level +//! ``` +//! +//! The log target is typically equal to the path of the module the message +//! in question originated from, though it can be overridden. +//! +//! The path is rooted in the name of the crate it was compiled for, so if +//! your program is in a file called, for example, `hello.rs`, the path would +//! simply be be `hello`. +//! +//! Furthermore, the log can be filtered using prefix-search based on the +//! specified log target. A value of, for example, `RUST_LOG=example`, would +//! match all of the messages with targets: +//! +//! * `example` +//! * `example::test` +//! * `example::test::module::submodule` +//! * `examples::and_more_examples` +//! +//! When providing the crate name or a module path, explicitly specifying the +//! log level is optional. If omitted, all logging for the item will be +//! enabled. +//! +//! The names of the log levels that may be specified correspond to the +//! variations of the [`log::Level`][level-enum] enum from the `log` +//! crate. They are: +//! +//! * `error` +//! * `warn` +//! * `info` +//! * `debug` +//! * `trace` +//! +//! There is also a pseudo logging level, `off`, which may be specified to +//! disable all logging for a given module or for the entire application. As +//! with the logging levels, the letter case is not significant[^fn-off]. +//! +//! [^fn-off]: Similar to the universe of log level names, the `off` pseudo +//! log level feature is also provided by the underlying `log` crate. +//! +//! The letter case is not significant for the logging level names; e.g., +//! `debug`, `DEBUG`, and `dEbuG` all represent the same logging level. For +//! consistency, our convention is to use the lower case names. Where our docs +//! do use other forms, they do so in the context of specific examples, so you +//! won't be surprised if you see similar usage in the wild. +//! +//! As the log level for a module is optional, the module to enable logging for +//! is also optional. **If only a level is provided, then the global log +//! level for all modules is set to this value.** +//! +//! Some examples of valid values of `RUST_LOG` are: +//! +//! * `hello` turns on all logging for the 'hello' module +//! * `trace` turns on all logging for the application, regardless of its name +//! * `TRACE` turns on all logging for the application, regardless of its name (same as previous) +//! * `info` turns on all info logging +//! * `INFO` turns on all info logging (same as previous) +//! * `hello=debug` turns on debug logging for 'hello' +//! * `hello=DEBUG` turns on debug logging for 'hello' (same as previous) +//! * `hello,std::option` turns on hello, and std's option logging +//! * `error,hello=warn` turn on global error logging and also warn for hello +//! * `error,hello=off` turn on global error logging, but turn off logging for hello +//! * `off` turns off all logging for the application +//! * `OFF` turns off all logging for the application (same as previous) +//! +//! ## Filtering results +//! +//! A `RUST_LOG` directive may include a regex filter. The syntax is to append `/` +//! followed by a regex. Each message is checked against the regex, and is only +//! logged if it matches. Note that the matching is done after formatting the +//! log string but before adding any logging meta-data. There is a single filter +//! for all modules. +//! +//! Some examples: +//! +//! * `hello/foo` turns on all logging for the 'hello' module where the log +//! message includes 'foo'. +//! * `info/f.o` turns on all info logging where the log message includes 'foo', +//! 'f1o', 'fao', etc. +//! * `hello=debug/foo*foo` turns on debug logging for 'hello' where the log +//! message includes 'foofoo' or 'fofoo' or 'fooooooofoo', etc. +//! * `error,hello=warn/[0-9]scopes` turn on global error logging and also +//! warn for hello. In both cases the log message must include a single digit +//! number followed by 'scopes'. +//! +//! ## Capturing logs in tests +//! +//! Records logged during `cargo test` will not be captured by the test harness by default. +//! The [`Builder::is_test`] method can be used in unit tests to ensure logs will be captured: +//! +//! ``` +//! # #[macro_use] extern crate log; +//! #[cfg(test)] +//! mod tests { +//! fn init() { +//! let _ = env_logger::builder().is_test(true).try_init(); +//! } +//! +//! #[test] +//! fn it_works() { +//! init(); +//! +//! info!("This record will be captured by `cargo test`"); +//! +//! assert_eq!(2, 1 + 1); +//! } +//! } +//! ``` +//! +//! Enabling test capturing comes at the expense of color and other style support +//! and may have performance implications. +//! +//! ## Disabling colors +//! +//! Colors and other styles can be configured with the `RUST_LOG_STYLE` +//! environment variable. It accepts the following values: +//! +//! * `auto` (default) will attempt to print style characters, but don't force the issue. +//! If the console isn't available on Windows, or if TERM=dumb, for example, then don't print colors. +//! * `always` will always print style characters even if they aren't supported by the terminal. +//! This includes emitting ANSI colors on Windows if the console API is unavailable. +//! * `never` will never print style characters. +//! +//! ## Tweaking the default format +//! +//! Parts of the default format can be excluded from the log output using the [`Builder`]. +//! The following example excludes the timestamp from the log output: +//! +//! ``` +//! env_logger::builder() +//! .format_timestamp(None) +//! .init(); +//! ``` +//! +//! ### Stability of the default format +//! +//! The default format won't optimise for long-term stability, and explicitly makes no +//! guarantees about the stability of its output across major, minor or patch version +//! bumps during `0.x`. +//! +//! If you want to capture or interpret the output of `env_logger` programmatically +//! then you should use a custom format. +//! +//! ### Using a custom format +//! +//! Custom formats can be provided as closures to the [`Builder`]. +//! These closures take a [`Formatter`] and `log::Record` as arguments: +//! +//! ``` +//! use std::io::Write; +//! +//! env_logger::builder() +//! .format(|buf, record| { +//! writeln!(buf, "{}: {}", record.level(), record.args()) +//! }) +//! .init(); +//! ``` +//! +//! See the [`fmt`] module for more details about custom formats. +//! +//! ## Specifying defaults for environment variables +//! +//! `env_logger` can read configuration from environment variables. +//! If these variables aren't present, the default value to use can be tweaked with the [`Env`] type. +//! The following example defaults to log `warn` and above if the `RUST_LOG` environment variable +//! isn't set: +//! +//! ``` +//! use env_logger::Env; +//! +//! env_logger::Builder::from_env(Env::default().default_filter_or("warn")).init(); +//! ``` +//! +//! [gh-repo-examples]: https://github.com/env-logger-rs/env_logger/tree/main/examples +//! [level-enum]: https://docs.rs/log/latest/log/enum.Level.html +//! [log-crate-url]: https://docs.rs/log/ +//! [`Builder`]: struct.Builder.html +//! [`Builder::is_test`]: struct.Builder.html#method.is_test +//! [`Env`]: struct.Env.html +//! [`fmt`]: fmt/index.html + +#![doc( + html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png", + html_favicon_url = "https://www.rust-lang.org/static/images/favicon.ico" +)] +// When compiled for the rustc compiler itself we want to make sure that this is +// an unstable crate +#![cfg_attr(rustbuild, feature(staged_api, rustc_private))] +#![cfg_attr(rustbuild, unstable(feature = "rustc_private", issue = "27812"))] +#![deny(missing_debug_implementations, missing_docs)] + +use std::{borrow::Cow, cell::RefCell, env, io}; + +use log::{LevelFilter, Log, Metadata, Record, SetLoggerError}; + +pub mod filter; +pub mod fmt; + +pub use self::fmt::glob::*; + +use self::filter::Filter; +use self::fmt::writer::{self, Writer}; +use self::fmt::{FormatFn, Formatter}; + +/// The default name for the environment variable to read filters from. +pub const DEFAULT_FILTER_ENV: &str = "RUST_LOG"; + +/// The default name for the environment variable to read style preferences from. +pub const DEFAULT_WRITE_STYLE_ENV: &str = "RUST_LOG_STYLE"; + +/// Set of environment variables to configure from. +/// +/// # Default environment variables +/// +/// By default, the `Env` will read the following environment variables: +/// +/// - `RUST_LOG`: the level filter +/// - `RUST_LOG_STYLE`: whether or not to print styles with records. +/// +/// These sources can be configured using the builder methods on `Env`. +#[derive(Debug)] +pub struct Env<'a> { + filter: Var<'a>, + write_style: Var<'a>, +} + +#[derive(Debug)] +struct Var<'a> { + name: Cow<'a, str>, + default: Option<Cow<'a, str>>, +} + +/// The env logger. +/// +/// This struct implements the `Log` trait from the [`log` crate][log-crate-url], +/// which allows it to act as a logger. +/// +/// The [`init()`], [`try_init()`], [`Builder::init()`] and [`Builder::try_init()`] +/// methods will each construct a `Logger` and immediately initialize it as the +/// default global logger. +/// +/// If you'd instead need access to the constructed `Logger`, you can use +/// the associated [`Builder`] and install it with the +/// [`log` crate][log-crate-url] directly. +/// +/// [log-crate-url]: https://docs.rs/log/ +/// [`init()`]: fn.init.html +/// [`try_init()`]: fn.try_init.html +/// [`Builder::init()`]: struct.Builder.html#method.init +/// [`Builder::try_init()`]: struct.Builder.html#method.try_init +/// [`Builder`]: struct.Builder.html +pub struct Logger { + writer: Writer, + filter: Filter, + format: FormatFn, +} + +/// `Builder` acts as builder for initializing a `Logger`. +/// +/// It can be used to customize the log format, change the environment variable used +/// to provide the logging directives and also set the default log level filter. +/// +/// # Examples +/// +/// ``` +/// # #[macro_use] extern crate log; +/// # use std::io::Write; +/// use env_logger::Builder; +/// use log::LevelFilter; +/// +/// let mut builder = Builder::from_default_env(); +/// +/// builder +/// .format(|buf, record| writeln!(buf, "{} - {}", record.level(), record.args())) +/// .filter(None, LevelFilter::Info) +/// .init(); +/// +/// error!("error message"); +/// info!("info message"); +/// ``` +#[derive(Default)] +pub struct Builder { + filter: filter::Builder, + writer: writer::Builder, + format: fmt::Builder, + built: bool, +} + +impl Builder { + /// Initializes the log builder with defaults. + /// + /// **NOTE:** This method won't read from any environment variables. + /// Use the [`filter`] and [`write_style`] methods to configure the builder + /// or use [`from_env`] or [`from_default_env`] instead. + /// + /// # Examples + /// + /// Create a new builder and configure filters and style: + /// + /// ``` + /// use log::LevelFilter; + /// use env_logger::{Builder, WriteStyle}; + /// + /// let mut builder = Builder::new(); + /// + /// builder + /// .filter(None, LevelFilter::Info) + /// .write_style(WriteStyle::Always) + /// .init(); + /// ``` + /// + /// [`filter`]: #method.filter + /// [`write_style`]: #method.write_style + /// [`from_env`]: #method.from_env + /// [`from_default_env`]: #method.from_default_env + pub fn new() -> Builder { + Default::default() + } + + /// Initializes the log builder from the environment. + /// + /// The variables used to read configuration from can be tweaked before + /// passing in. + /// + /// # Examples + /// + /// Initialise a logger reading the log filter from an environment variable + /// called `MY_LOG`: + /// + /// ``` + /// use env_logger::Builder; + /// + /// let mut builder = Builder::from_env("MY_LOG"); + /// builder.init(); + /// ``` + /// + /// Initialise a logger using the `MY_LOG` variable for filtering and + /// `MY_LOG_STYLE` for whether or not to write styles: + /// + /// ``` + /// use env_logger::{Builder, Env}; + /// + /// let env = Env::new().filter("MY_LOG").write_style("MY_LOG_STYLE"); + /// + /// let mut builder = Builder::from_env(env); + /// builder.init(); + /// ``` + pub fn from_env<'a, E>(env: E) -> Self + where + E: Into<Env<'a>>, + { + let mut builder = Builder::new(); + builder.parse_env(env); + builder + } + + /// Applies the configuration from the environment. + /// + /// This function allows a builder to be configured with default parameters, + /// to be then overridden by the environment. + /// + /// # Examples + /// + /// Initialise a logger with filter level `Off`, then override the log + /// filter from an environment variable called `MY_LOG`: + /// + /// ``` + /// use log::LevelFilter; + /// use env_logger::Builder; + /// + /// let mut builder = Builder::new(); + /// + /// builder.filter_level(LevelFilter::Off); + /// builder.parse_env("MY_LOG"); + /// builder.init(); + /// ``` + /// + /// Initialise a logger with filter level `Off`, then use the `MY_LOG` + /// variable to override filtering and `MY_LOG_STYLE` to override whether + /// or not to write styles: + /// + /// ``` + /// use log::LevelFilter; + /// use env_logger::{Builder, Env}; + /// + /// let env = Env::new().filter("MY_LOG").write_style("MY_LOG_STYLE"); + /// + /// let mut builder = Builder::new(); + /// builder.filter_level(LevelFilter::Off); + /// builder.parse_env(env); + /// builder.init(); + /// ``` + pub fn parse_env<'a, E>(&mut self, env: E) -> &mut Self + where + E: Into<Env<'a>>, + { + let env = env.into(); + + if let Some(s) = env.get_filter() { + self.parse_filters(&s); + } + + if let Some(s) = env.get_write_style() { + self.parse_write_style(&s); + } + + self + } + + /// Initializes the log builder from the environment using default variable names. + /// + /// This method is a convenient way to call `from_env(Env::default())` without + /// having to use the `Env` type explicitly. The builder will use the + /// [default environment variables]. + /// + /// # Examples + /// + /// Initialise a logger using the default environment variables: + /// + /// ``` + /// use env_logger::Builder; + /// + /// let mut builder = Builder::from_default_env(); + /// builder.init(); + /// ``` + /// + /// [default environment variables]: struct.Env.html#default-environment-variables + pub fn from_default_env() -> Self { + Self::from_env(Env::default()) + } + + /// Applies the configuration from the environment using default variable names. + /// + /// This method is a convenient way to call `parse_env(Env::default())` without + /// having to use the `Env` type explicitly. The builder will use the + /// [default environment variables]. + /// + /// # Examples + /// + /// Initialise a logger with filter level `Off`, then configure it using the + /// default environment variables: + /// + /// ``` + /// use log::LevelFilter; + /// use env_logger::Builder; + /// + /// let mut builder = Builder::new(); + /// builder.filter_level(LevelFilter::Off); + /// builder.parse_default_env(); + /// builder.init(); + /// ``` + /// + /// [default environment variables]: struct.Env.html#default-environment-variables + pub fn parse_default_env(&mut self) -> &mut Self { + self.parse_env(Env::default()) + } + + /// Sets the format function for formatting the log output. + /// + /// This function is called on each record logged and should format the + /// log record and output it to the given [`Formatter`]. + /// + /// The format function is expected to output the string directly to the + /// `Formatter` so that implementations can use the [`std::fmt`] macros + /// to format and output without intermediate heap allocations. The default + /// `env_logger` formatter takes advantage of this. + /// + /// # Examples + /// + /// Use a custom format to write only the log message: + /// + /// ``` + /// use std::io::Write; + /// use env_logger::Builder; + /// + /// let mut builder = Builder::new(); + /// + /// builder.format(|buf, record| writeln!(buf, "{}", record.args())); + /// ``` + /// + /// [`Formatter`]: fmt/struct.Formatter.html + /// [`String`]: https://doc.rust-lang.org/stable/std/string/struct.String.html + /// [`std::fmt`]: https://doc.rust-lang.org/std/fmt/index.html + pub fn format<F: 'static>(&mut self, format: F) -> &mut Self + where + F: Fn(&mut Formatter, &Record) -> io::Result<()> + Sync + Send, + { + self.format.custom_format = Some(Box::new(format)); + self + } + + /// Use the default format. + /// + /// This method will clear any custom format set on the builder. + pub fn default_format(&mut self) -> &mut Self { + self.format = Default::default(); + self + } + + /// Whether or not to write the level in the default format. + pub fn format_level(&mut self, write: bool) -> &mut Self { + self.format.format_level = write; + self + } + + /// Whether or not to write the module path in the default format. + pub fn format_module_path(&mut self, write: bool) -> &mut Self { + self.format.format_module_path = write; + self + } + + /// Whether or not to write the target in the default format. + pub fn format_target(&mut self, write: bool) -> &mut Self { + self.format.format_target = write; + self + } + + /// Configures the amount of spaces to use to indent multiline log records. + /// A value of `None` disables any kind of indentation. + pub fn format_indent(&mut self, indent: Option<usize>) -> &mut Self { + self.format.format_indent = indent; + self + } + + /// Configures if timestamp should be included and in what precision. + pub fn format_timestamp(&mut self, timestamp: Option<fmt::TimestampPrecision>) -> &mut Self { + self.format.format_timestamp = timestamp; + self + } + + /// Configures the timestamp to use second precision. + pub fn format_timestamp_secs(&mut self) -> &mut Self { + self.format_timestamp(Some(fmt::TimestampPrecision::Seconds)) + } + + /// Configures the timestamp to use millisecond precision. + pub fn format_timestamp_millis(&mut self) -> &mut Self { + self.format_timestamp(Some(fmt::TimestampPrecision::Millis)) + } + + /// Configures the timestamp to use microsecond precision. + pub fn format_timestamp_micros(&mut self) -> &mut Self { + self.format_timestamp(Some(fmt::TimestampPrecision::Micros)) + } + + /// Configures the timestamp to use nanosecond precision. + pub fn format_timestamp_nanos(&mut self) -> &mut Self { + self.format_timestamp(Some(fmt::TimestampPrecision::Nanos)) + } + + /// Configures the end of line suffix. + pub fn format_suffix(&mut self, suffix: &'static str) -> &mut Self { + self.format.format_suffix = suffix; + self + } + + /// Adds a directive to the filter for a specific module. + /// + /// # Examples + /// + /// Only include messages for info and above for logs in `path::to::module`: + /// + /// ``` + /// use env_logger::Builder; + /// use log::LevelFilter; + /// + /// let mut builder = Builder::new(); + /// + /// builder.filter_module("path::to::module", LevelFilter::Info); + /// ``` + pub fn filter_module(&mut self, module: &str, level: LevelFilter) -> &mut Self { + self.filter.filter_module(module, level); + self + } + + /// Adds a directive to the filter for all modules. + /// + /// # Examples + /// + /// Only include messages for info and above for logs globally: + /// + /// ``` + /// use env_logger::Builder; + /// use log::LevelFilter; + /// + /// let mut builder = Builder::new(); + /// + /// builder.filter_level(LevelFilter::Info); + /// ``` + pub fn filter_level(&mut self, level: LevelFilter) -> &mut Self { + self.filter.filter_level(level); + self + } + + /// Adds filters to the logger. + /// + /// The given module (if any) will log at most the specified level provided. + /// If no module is provided then the filter will apply to all log messages. + /// + /// # Examples + /// + /// Only include messages for info and above for logs in `path::to::module`: + /// + /// ``` + /// use env_logger::Builder; + /// use log::LevelFilter; + /// + /// let mut builder = Builder::new(); + /// + /// builder.filter(Some("path::to::module"), LevelFilter::Info); + /// ``` + pub fn filter(&mut self, module: Option<&str>, level: LevelFilter) -> &mut Self { + self.filter.filter(module, level); + self + } + + /// Parses the directives string in the same form as the `RUST_LOG` + /// environment variable. + /// + /// See the module documentation for more details. + pub fn parse_filters(&mut self, filters: &str) -> &mut Self { + self.filter.parse(filters); + self + } + + /// Sets the target for the log output. + /// + /// Env logger can log to either stdout, stderr or a custom pipe. The default is stderr. + /// + /// The custom pipe can be used to send the log messages to a custom sink (for example a file). + /// Do note that direct writes to a file can become a bottleneck due to IO operation times. + /// + /// # Examples + /// + /// Write log message to `stdout`: + /// + /// ``` + /// use env_logger::{Builder, Target}; + /// + /// let mut builder = Builder::new(); + /// + /// builder.target(Target::Stdout); + /// ``` + pub fn target(&mut self, target: fmt::Target) -> &mut Self { + self.writer.target(target); + self + } + + /// Sets whether or not styles will be written. + /// + /// This can be useful in environments that don't support control characters + /// for setting colors. + /// + /// # Examples + /// + /// Never attempt to write styles: + /// + /// ``` + /// use env_logger::{Builder, WriteStyle}; + /// + /// let mut builder = Builder::new(); + /// + /// builder.write_style(WriteStyle::Never); + /// ``` + pub fn write_style(&mut self, write_style: fmt::WriteStyle) -> &mut Self { + self.writer.write_style(write_style); + self + } + + /// Parses whether or not to write styles in the same form as the `RUST_LOG_STYLE` + /// environment variable. + /// + /// See the module documentation for more details. + pub fn parse_write_style(&mut self, write_style: &str) -> &mut Self { + self.writer.parse_write_style(write_style); + self + } + + /// Sets whether or not the logger will be used in unit tests. + /// + /// If `is_test` is `true` then the logger will allow the testing framework to + /// capture log records rather than printing them to the terminal directly. + pub fn is_test(&mut self, is_test: bool) -> &mut Self { + self.writer.is_test(is_test); + self + } + + /// Initializes the global logger with the built env logger. + /// + /// This should be called early in the execution of a Rust program. Any log + /// events that occur before initialization will be ignored. + /// + /// # Errors + /// + /// This function will fail if it is called more than once, or if another + /// library has already initialized a global logger. + pub fn try_init(&mut self) -> Result<(), SetLoggerError> { + let logger = self.build(); + + let max_level = logger.filter(); + let r = log::set_boxed_logger(Box::new(logger)); + + if r.is_ok() { + log::set_max_level(max_level); + } + + r + } + + /// Initializes the global logger with the built env logger. + /// + /// This should be called early in the execution of a Rust program. Any log + /// events that occur before initialization will be ignored. + /// + /// # Panics + /// + /// This function will panic if it is called more than once, or if another + /// library has already initialized a global logger. + pub fn init(&mut self) { + self.try_init() + .expect("Builder::init should not be called after logger initialized"); + } + + /// Build an env logger. + /// + /// The returned logger implements the `Log` trait and can be installed manually + /// or nested within another logger. + pub fn build(&mut self) -> Logger { + assert!(!self.built, "attempt to re-use consumed builder"); + self.built = true; + + Logger { + writer: self.writer.build(), + filter: self.filter.build(), + format: self.format.build(), + } + } +} + +impl Logger { + /// Creates the logger from the environment. + /// + /// The variables used to read configuration from can be tweaked before + /// passing in. + /// + /// # Examples + /// + /// Create a logger reading the log filter from an environment variable + /// called `MY_LOG`: + /// + /// ``` + /// use env_logger::Logger; + /// + /// let logger = Logger::from_env("MY_LOG"); + /// ``` + /// + /// Create a logger using the `MY_LOG` variable for filtering and + /// `MY_LOG_STYLE` for whether or not to write styles: + /// + /// ``` + /// use env_logger::{Logger, Env}; + /// + /// let env = Env::new().filter_or("MY_LOG", "info").write_style_or("MY_LOG_STYLE", "always"); + /// + /// let logger = Logger::from_env(env); + /// ``` + pub fn from_env<'a, E>(env: E) -> Self + where + E: Into<Env<'a>>, + { + Builder::from_env(env).build() + } + + /// Creates the logger from the environment using default variable names. + /// + /// This method is a convenient way to call `from_env(Env::default())` without + /// having to use the `Env` type explicitly. The logger will use the + /// [default environment variables]. + /// + /// # Examples + /// + /// Creates a logger using the default environment variables: + /// + /// ``` + /// use env_logger::Logger; + /// + /// let logger = Logger::from_default_env(); + /// ``` + /// + /// [default environment variables]: struct.Env.html#default-environment-variables + pub fn from_default_env() -> Self { + Builder::from_default_env().build() + } + + /// Returns the maximum `LevelFilter` that this env logger instance is + /// configured to output. + pub fn filter(&self) -> LevelFilter { + self.filter.filter() + } + + /// Checks if this record matches the configured filter. + pub fn matches(&self, record: &Record) -> bool { + self.filter.matches(record) + } +} + +impl Log for Logger { + fn enabled(&self, metadata: &Metadata) -> bool { + self.filter.enabled(metadata) + } + + fn log(&self, record: &Record) { + if self.matches(record) { + // Log records are written to a thread-local buffer before being printed + // to the terminal. We clear these buffers afterwards, but they aren't shrunk + // so will always at least have capacity for the largest log record formatted + // on that thread. + // + // If multiple `Logger`s are used by the same threads then the thread-local + // formatter might have different color support. If this is the case the + // formatter and its buffer are discarded and recreated. + + thread_local! { + static FORMATTER: RefCell<Option<Formatter>> = RefCell::new(None); + } + + let print = |formatter: &mut Formatter, record: &Record| { + let _ = + (self.format)(formatter, record).and_then(|_| formatter.print(&self.writer)); + + // Always clear the buffer afterwards + formatter.clear(); + }; + + let printed = FORMATTER + .try_with(|tl_buf| { + match tl_buf.try_borrow_mut() { + // There are no active borrows of the buffer + Ok(mut tl_buf) => match *tl_buf { + // We have a previously set formatter + Some(ref mut formatter) => { + // Check the buffer style. If it's different from the logger's + // style then drop the buffer and recreate it. + if formatter.write_style() != self.writer.write_style() { + *formatter = Formatter::new(&self.writer); + } + + print(formatter, record); + } + // We don't have a previously set formatter + None => { + let mut formatter = Formatter::new(&self.writer); + print(&mut formatter, record); + + *tl_buf = Some(formatter); + } + }, + // There's already an active borrow of the buffer (due to re-entrancy) + Err(_) => { + print(&mut Formatter::new(&self.writer), record); + } + } + }) + .is_ok(); + + if !printed { + // The thread-local storage was not available (because its + // destructor has already run). Create a new single-use + // Formatter on the stack for this call. + print(&mut Formatter::new(&self.writer), record); + } + } + } + + fn flush(&self) {} +} + +impl<'a> Env<'a> { + /// Get a default set of environment variables. + pub fn new() -> Self { + Self::default() + } + + /// Specify an environment variable to read the filter from. + pub fn filter<E>(mut self, filter_env: E) -> Self + where + E: Into<Cow<'a, str>>, + { + self.filter = Var::new(filter_env); + + self + } + + /// Specify an environment variable to read the filter from. + /// + /// If the variable is not set, the default value will be used. + pub fn filter_or<E, V>(mut self, filter_env: E, default: V) -> Self + where + E: Into<Cow<'a, str>>, + V: Into<Cow<'a, str>>, + { + self.filter = Var::new_with_default(filter_env, default); + + self + } + + /// Use the default environment variable to read the filter from. + /// + /// If the variable is not set, the default value will be used. + pub fn default_filter_or<V>(mut self, default: V) -> Self + where + V: Into<Cow<'a, str>>, + { + self.filter = Var::new_with_default(DEFAULT_FILTER_ENV, default); + + self + } + + fn get_filter(&self) -> Option<String> { + self.filter.get() + } + + /// Specify an environment variable to read the style from. + pub fn write_style<E>(mut self, write_style_env: E) -> Self + where + E: Into<Cow<'a, str>>, + { + self.write_style = Var::new(write_style_env); + + self + } + + /// Specify an environment variable to read the style from. + /// + /// If the variable is not set, the default value will be used. + pub fn write_style_or<E, V>(mut self, write_style_env: E, default: V) -> Self + where + E: Into<Cow<'a, str>>, + V: Into<Cow<'a, str>>, + { + self.write_style = Var::new_with_default(write_style_env, default); + + self + } + + /// Use the default environment variable to read the style from. + /// + /// If the variable is not set, the default value will be used. + pub fn default_write_style_or<V>(mut self, default: V) -> Self + where + V: Into<Cow<'a, str>>, + { + self.write_style = Var::new_with_default(DEFAULT_WRITE_STYLE_ENV, default); + + self + } + + fn get_write_style(&self) -> Option<String> { + self.write_style.get() + } +} + +impl<'a> Var<'a> { + fn new<E>(name: E) -> Self + where + E: Into<Cow<'a, str>>, + { + Var { + name: name.into(), + default: None, + } + } + + fn new_with_default<E, V>(name: E, default: V) -> Self + where + E: Into<Cow<'a, str>>, + V: Into<Cow<'a, str>>, + { + Var { + name: name.into(), + default: Some(default.into()), + } + } + + fn get(&self) -> Option<String> { + env::var(&*self.name) + .ok() + .or_else(|| self.default.to_owned().map(|v| v.into_owned())) + } +} + +impl<'a, T> From<T> for Env<'a> +where + T: Into<Cow<'a, str>>, +{ + fn from(filter_env: T) -> Self { + Env::default().filter(filter_env.into()) + } +} + +impl<'a> Default for Env<'a> { + fn default() -> Self { + Env { + filter: Var::new(DEFAULT_FILTER_ENV), + write_style: Var::new(DEFAULT_WRITE_STYLE_ENV), + } + } +} + +mod std_fmt_impls { + use super::*; + use std::fmt; + + impl fmt::Debug for Logger { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.debug_struct("Logger") + .field("filter", &self.filter) + .finish() + } + } + + impl fmt::Debug for Builder { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + if self.built { + f.debug_struct("Logger").field("built", &true).finish() + } else { + f.debug_struct("Logger") + .field("filter", &self.filter) + .field("writer", &self.writer) + .finish() + } + } + } +} + +/// Attempts to initialize the global logger with an env logger. +/// +/// This should be called early in the execution of a Rust program. Any log +/// events that occur before initialization will be ignored. +/// +/// # Errors +/// +/// This function will fail if it is called more than once, or if another +/// library has already initialized a global logger. +pub fn try_init() -> Result<(), SetLoggerError> { + try_init_from_env(Env::default()) +} + +/// Initializes the global logger with an env logger. +/// +/// This should be called early in the execution of a Rust program. Any log +/// events that occur before initialization will be ignored. +/// +/// # Panics +/// +/// This function will panic if it is called more than once, or if another +/// library has already initialized a global logger. +pub fn init() { + try_init().expect("env_logger::init should not be called after logger initialized"); +} + +/// Attempts to initialize the global logger with an env logger from the given +/// environment variables. +/// +/// This should be called early in the execution of a Rust program. Any log +/// events that occur before initialization will be ignored. +/// +/// # Examples +/// +/// Initialise a logger using the `MY_LOG` environment variable for filters +/// and `MY_LOG_STYLE` for writing colors: +/// +/// ``` +/// use env_logger::{Builder, Env}; +/// +/// # fn run() -> Result<(), Box<dyn ::std::error::Error>> { +/// let env = Env::new().filter("MY_LOG").write_style("MY_LOG_STYLE"); +/// +/// env_logger::try_init_from_env(env)?; +/// +/// Ok(()) +/// # } +/// # run().unwrap(); +/// ``` +/// +/// # Errors +/// +/// This function will fail if it is called more than once, or if another +/// library has already initialized a global logger. +pub fn try_init_from_env<'a, E>(env: E) -> Result<(), SetLoggerError> +where + E: Into<Env<'a>>, +{ + let mut builder = Builder::from_env(env); + + builder.try_init() +} + +/// Initializes the global logger with an env logger from the given environment +/// variables. +/// +/// This should be called early in the execution of a Rust program. Any log +/// events that occur before initialization will be ignored. +/// +/// # Examples +/// +/// Initialise a logger using the `MY_LOG` environment variable for filters +/// and `MY_LOG_STYLE` for writing colors: +/// +/// ``` +/// use env_logger::{Builder, Env}; +/// +/// let env = Env::new().filter("MY_LOG").write_style("MY_LOG_STYLE"); +/// +/// env_logger::init_from_env(env); +/// ``` +/// +/// # Panics +/// +/// This function will panic if it is called more than once, or if another +/// library has already initialized a global logger. +pub fn init_from_env<'a, E>(env: E) +where + E: Into<Env<'a>>, +{ + try_init_from_env(env) + .expect("env_logger::init_from_env should not be called after logger initialized"); +} + +/// Create a new builder with the default environment variables. +/// +/// The builder can be configured before being initialized. +/// This is a convenient way of calling [`Builder::from_default_env`]. +/// +/// [`Builder::from_default_env`]: struct.Builder.html#method.from_default_env +pub fn builder() -> Builder { + Builder::from_default_env() +} + +/// Create a builder from the given environment variables. +/// +/// The builder can be configured before being initialized. +#[deprecated( + since = "0.8.0", + note = "Prefer `env_logger::Builder::from_env()` instead." +)] +pub fn from_env<'a, E>(env: E) -> Builder +where + E: Into<Env<'a>>, +{ + Builder::from_env(env) +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn env_get_filter_reads_from_var_if_set() { + env::set_var("env_get_filter_reads_from_var_if_set", "from var"); + + let env = Env::new().filter_or("env_get_filter_reads_from_var_if_set", "from default"); + + assert_eq!(Some("from var".to_owned()), env.get_filter()); + } + + #[test] + fn env_get_filter_reads_from_default_if_var_not_set() { + env::remove_var("env_get_filter_reads_from_default_if_var_not_set"); + + let env = Env::new().filter_or( + "env_get_filter_reads_from_default_if_var_not_set", + "from default", + ); + + assert_eq!(Some("from default".to_owned()), env.get_filter()); + } + + #[test] + fn env_get_write_style_reads_from_var_if_set() { + env::set_var("env_get_write_style_reads_from_var_if_set", "from var"); + + let env = + Env::new().write_style_or("env_get_write_style_reads_from_var_if_set", "from default"); + + assert_eq!(Some("from var".to_owned()), env.get_write_style()); + } + + #[test] + fn env_get_write_style_reads_from_default_if_var_not_set() { + env::remove_var("env_get_write_style_reads_from_default_if_var_not_set"); + + let env = Env::new().write_style_or( + "env_get_write_style_reads_from_default_if_var_not_set", + "from default", + ); + + assert_eq!(Some("from default".to_owned()), env.get_write_style()); + } + + #[test] + fn builder_parse_env_overrides_existing_filters() { + env::set_var( + "builder_parse_default_env_overrides_existing_filters", + "debug", + ); + let env = Env::new().filter("builder_parse_default_env_overrides_existing_filters"); + + let mut builder = Builder::new(); + builder.filter_level(LevelFilter::Trace); + // Overrides global level to debug + builder.parse_env(env); + + assert_eq!(builder.filter.build().filter(), LevelFilter::Debug); + } +} diff --git a/third_party/rust/env_logger/tests/init-twice-retains-filter.rs b/third_party/rust/env_logger/tests/init-twice-retains-filter.rs new file mode 100644 index 0000000000..673da3fd28 --- /dev/null +++ b/third_party/rust/env_logger/tests/init-twice-retains-filter.rs @@ -0,0 +1,40 @@ +extern crate env_logger; +extern crate log; + +use std::env; +use std::process; +use std::str; + +fn main() { + if env::var("YOU_ARE_TESTING_NOW").is_ok() { + // Init from the env (which should set the max level to `Debug`) + env_logger::init(); + + assert_eq!(log::LevelFilter::Debug, log::max_level()); + + // Init again using a different max level + // This shouldn't clobber the level that was previously set + env_logger::Builder::new() + .parse_filters("info") + .try_init() + .unwrap_err(); + + assert_eq!(log::LevelFilter::Debug, log::max_level()); + return; + } + + let exe = env::current_exe().unwrap(); + let out = process::Command::new(exe) + .env("YOU_ARE_TESTING_NOW", "1") + .env("RUST_LOG", "debug") + .output() + .unwrap_or_else(|e| panic!("Unable to start child process: {}", e)); + if out.status.success() { + return; + } + + println!("test failed: {}", out.status); + println!("--- stdout\n{}", str::from_utf8(&out.stdout).unwrap()); + println!("--- stderr\n{}", str::from_utf8(&out.stderr).unwrap()); + process::exit(1); +} diff --git a/third_party/rust/env_logger/tests/log-in-log.rs b/third_party/rust/env_logger/tests/log-in-log.rs new file mode 100644 index 0000000000..89517ff362 --- /dev/null +++ b/third_party/rust/env_logger/tests/log-in-log.rs @@ -0,0 +1,39 @@ +#[macro_use] +extern crate log; +extern crate env_logger; + +use std::env; +use std::fmt; +use std::process; +use std::str; + +struct Foo; + +impl fmt::Display for Foo { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + info!("test"); + f.write_str("bar") + } +} + +fn main() { + env_logger::init(); + if env::var("YOU_ARE_TESTING_NOW").is_ok() { + return info!("{}", Foo); + } + + let exe = env::current_exe().unwrap(); + let out = process::Command::new(exe) + .env("YOU_ARE_TESTING_NOW", "1") + .env("RUST_LOG", "debug") + .output() + .unwrap_or_else(|e| panic!("Unable to start child process: {}", e)); + if out.status.success() { + return; + } + + println!("test failed: {}", out.status); + println!("--- stdout\n{}", str::from_utf8(&out.stdout).unwrap()); + println!("--- stderr\n{}", str::from_utf8(&out.stderr).unwrap()); + process::exit(1); +} diff --git a/third_party/rust/env_logger/tests/log_tls_dtors.rs b/third_party/rust/env_logger/tests/log_tls_dtors.rs new file mode 100644 index 0000000000..5db87bd6c5 --- /dev/null +++ b/third_party/rust/env_logger/tests/log_tls_dtors.rs @@ -0,0 +1,66 @@ +#[macro_use] +extern crate log; +extern crate env_logger; + +use std::env; +use std::process; +use std::str; +use std::thread; + +struct DropMe; + +impl Drop for DropMe { + fn drop(&mut self) { + debug!("Dropping now"); + } +} + +fn run() { + // Use multiple thread local values to increase the chance that our TLS + // value will get destroyed after the FORMATTER key in the library + thread_local! { + static DROP_ME_0: DropMe = DropMe; + static DROP_ME_1: DropMe = DropMe; + static DROP_ME_2: DropMe = DropMe; + static DROP_ME_3: DropMe = DropMe; + static DROP_ME_4: DropMe = DropMe; + static DROP_ME_5: DropMe = DropMe; + static DROP_ME_6: DropMe = DropMe; + static DROP_ME_7: DropMe = DropMe; + static DROP_ME_8: DropMe = DropMe; + static DROP_ME_9: DropMe = DropMe; + } + DROP_ME_0.with(|_| {}); + DROP_ME_1.with(|_| {}); + DROP_ME_2.with(|_| {}); + DROP_ME_3.with(|_| {}); + DROP_ME_4.with(|_| {}); + DROP_ME_5.with(|_| {}); + DROP_ME_6.with(|_| {}); + DROP_ME_7.with(|_| {}); + DROP_ME_8.with(|_| {}); + DROP_ME_9.with(|_| {}); +} + +fn main() { + env_logger::init(); + if env::var("YOU_ARE_TESTING_NOW").is_ok() { + // Run on a separate thread because TLS values on the main thread + // won't have their destructors run if pthread is used. + // https://doc.rust-lang.org/std/thread/struct.LocalKey.html#platform-specific-behavior + thread::spawn(run).join().unwrap(); + } else { + let exe = env::current_exe().unwrap(); + let out = process::Command::new(exe) + .env("YOU_ARE_TESTING_NOW", "1") + .env("RUST_LOG", "debug") + .output() + .unwrap_or_else(|e| panic!("Unable to start child process: {}", e)); + if !out.status.success() { + println!("test failed: {}", out.status); + println!("--- stdout\n{}", str::from_utf8(&out.stdout).unwrap()); + println!("--- stderr\n{}", str::from_utf8(&out.stderr).unwrap()); + process::exit(1); + } + } +} diff --git a/third_party/rust/env_logger/tests/regexp_filter.rs b/third_party/rust/env_logger/tests/regexp_filter.rs new file mode 100644 index 0000000000..40178bac7f --- /dev/null +++ b/third_party/rust/env_logger/tests/regexp_filter.rs @@ -0,0 +1,57 @@ +#[macro_use] +extern crate log; +extern crate env_logger; + +use std::env; +use std::process; +use std::str; + +fn main() { + if env::var("LOG_REGEXP_TEST").ok() == Some(String::from("1")) { + child_main(); + } else { + parent_main() + } +} + +fn child_main() { + env_logger::init(); + info!("XYZ Message"); +} + +fn run_child(rust_log: String) -> bool { + let exe = env::current_exe().unwrap(); + let out = process::Command::new(exe) + .env("LOG_REGEXP_TEST", "1") + .env("RUST_LOG", rust_log) + .output() + .unwrap_or_else(|e| panic!("Unable to start child process: {}", e)); + str::from_utf8(out.stderr.as_ref()) + .unwrap() + .contains("XYZ Message") +} + +fn assert_message_printed(rust_log: &str) { + if !run_child(rust_log.to_string()) { + panic!("RUST_LOG={} should allow the test log message", rust_log) + } +} + +fn assert_message_not_printed(rust_log: &str) { + if run_child(rust_log.to_string()) { + panic!( + "RUST_LOG={} should not allow the test log message", + rust_log + ) + } +} + +fn parent_main() { + // test normal log severity levels + assert_message_printed("info"); + assert_message_not_printed("warn"); + + // test of regular expression filters + assert_message_printed("info/XYZ"); + assert_message_not_printed("info/XXX"); +} |