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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/h2 | |
| 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 '')
62 files changed, 25872 insertions, 0 deletions
diff --git a/third_party/rust/h2/.cargo-checksum.json b/third_party/rust/h2/.cargo-checksum.json new file mode 100644 index 0000000000..1e68a22dc8 --- /dev/null +++ b/third_party/rust/h2/.cargo-checksum.json @@ -0,0 +1 @@ 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\ No newline at end of file diff --git a/third_party/rust/h2/CHANGELOG.md b/third_party/rust/h2/CHANGELOG.md new file mode 100644 index 0000000000..09c99aac32 --- /dev/null +++ b/third_party/rust/h2/CHANGELOG.md @@ -0,0 +1,272 @@ +# 0.3.15 (October 21, 2022) + +* Remove `B: Buf` bound on `SendStream`'s parameter +* add accessor for `StreamId` u32 + +# 0.3.14 (August 16, 2022) + +* Add `Error::is_reset` function. +* Bump MSRV to Rust 1.56. +* Return `RST_STREAM(NO_ERROR)` when the server early responds. + +# 0.3.13 (March 31, 2022) + +* Update private internal `tokio-util` dependency. + +# 0.3.12 (March 9, 2022) + +* Avoid time operations that can panic (#599) +* Bump MSRV to Rust 1.49 (#606) +* Fix header decoding error when a header name is contained at a continuation + header boundary (#589) +* Remove I/O type names from handshake `tracing` spans (#608) + +# 0.3.11 (January 26, 2022) + +* Make `SendStream::poll_capacity` never return `Ok(Some(0))` (#596) +* Fix panic when receiving already reset push promise (#597) + +# 0.3.10 (January 6, 2022) + +* Add `Error::is_go_away()` and `Error::is_remote()` methods. +* Fix panic if receiving malformed PUSH_PROMISE with stream ID of 0. + +# 0.3.9 (December 9, 2021) + +* Fix hang related to new `max_send_buffer_size`. + +# 0.3.8 (December 8, 2021) + +* Add "extended CONNECT support". Adds `h2::ext::Protocol`, which is used for request and response extensions to connect new protocols over an HTTP/2 stream. +* Add `max_send_buffer_size` options to client and server builders, and a default of ~400MB. This acts like a high-water mark for the `poll_capacity()` method. +* Fix panic if receiving malformed HEADERS with stream ID of 0. + +# 0.3.7 (October 22, 2021) + +* Fix panic if server sends a malformed frame on a stream client was about to open. +* Fix server to treat `:status` in a request as a stream error instead of connection error. + +# 0.3.6 (September 30, 2021) + +* Fix regression of `h2::Error` that were created via `From<h2::Reason>` not returning their reason code in `Error::reason()`. + +# 0.3.5 (September 29, 2021) + +* Fix sending of very large headers. Previously when a single header was too big to fit in a single `HEADERS` frame, an error was returned. Now it is broken up and sent correctly. +* Fix buffered data field to be a bigger integer size. +* Refactor error format to include what initiated the error (remote, local, or user), if it was a stream or connection-level error, and any received debug data. + +# 0.3.4 (August 20, 2021) + +* Fix panic when encoding header size update over a certain size. +* Fix `SendRequest` to wake up connection when dropped. +* Fix potential hang if `RecvStream` is placed in the request or response `extensions`. +* Stop calling `Instant::now` if zero reset streams are configured. + +# 0.3.3 (April 29, 2021) + +* Fix client being able to make `CONNECT` requests without a `:path`. +* Expose `RecvStream::poll_data`. +* Fix some docs. + +# 0.3.2 (March 24, 2021) + +* Fix incorrect handling of received 1xx responses on the client when the request body is still streaming. + +# 0.3.1 (February 26, 2021) + +* Add `Connection::max_concurrent_recv_streams()` getter. +* Add `Connection::max_concurrent_send_streams()` getter. +* Fix client to ignore receipt of 1xx headers frames. +* Fix incorrect calculation of pseudo header lengths when determining if a received header is too big. +* Reduce monomorphized code size of internal code. + +# 0.3.0 (December 23, 2020) + +* Update to Tokio v1 and Bytes v1. +* Disable `tracing`'s `log` feature. (It can still be enabled by a user in their own `Cargo.toml`.) + +# 0.2.7 (October 22, 2020) + +* Fix stream ref count when sending a push promise +* Fix receiving empty DATA frames in response to a HEAD request +* Fix handling of client disabling SERVER_PUSH + +# 0.2.6 (July 13, 2020) + +* Integrate `tracing` directly where `log` was used. (For 0.2.x, `log`s are still emitted by default.) + +# 0.2.5 (May 6, 2020) + +* Fix rare debug assert failure in store shutdown. + +# 0.2.4 (March 30, 2020) + +* Fix when receiving `SETTINGS_HEADER_TABLE_SIZE` setting. + +# 0.2.3 (March 25, 2020) + +* Fix server being able to accept `CONNECT` requests without `:scheme` or `:path`. +* Fix receiving a GOAWAY frame from updating the recv max ID, it should only update max send ID. + +# 0.2.2 (March 3, 2020) + +* Reduce size of `FlowControl` and `RecvStream`. + +# 0.2.1 (December 6, 2019) + +* Relax `Unpin` bounds on the send `Buf` generic. + +# 0.2.0 (December 3, 2019) + +* Add `server::Connection::set_initial_window_size` and `client::Connection::set_initial_window_size` which can adjust the `INITIAL_WINDOW_SIZE` setting on an existing connection (#421). +* Update to `http` v0.2. +* Update to `tokio` v0.2. +* Change `unstable-stream` feature to `stream`. +* Change `ReserveCapacity` to `FlowControl` (#423). +* Remove `From<io::Error>` for `Error`. + +# 0.2.0-alpha.3 (October 1, 2019) + +* Update to futures `0.3.0-alpha.19`. +* Update to tokio `0.2.0-alpha.6`. + +# 0.2.0-alpha.2 (September 20, 2019) + +* Add server support for `PUSH_PROMISE`s (#327). +* Update to tokio `0.2.0-alpha.5`. +* Change `stream` feature to `unstable-stream`. + +# 0.2.0-alpha.1 (August 30, 2019) + +* Update from `futures` 0.1 to `std::future::Future`. +* Update `AsyncRead`/`AsyncWrite` to `tokio-io` 0.2 alpha. +* Change `Stream` implementations to be optional, default disabled. Specific async and poll functions are now inherent, and `Stream` can be re-enabled with the `stream` cargo feature. + +# 0.1.25 (June 28, 2019) + +* Fix to send a `RST_STREAM` instead of `GOAWAY` if receiving a frame on a previously closed stream. +* Fix receiving trailers without an end-stream flag to be a stream error instead of connection error. + +# 0.1.24 (June 17, 2019) + +* Fix server wrongly rejecting requests that don't have an `:authority` header (#372). + +# 0.1.23 (June 4, 2019) + +* Fix leaking of received DATA frames if the `RecvStream` is never polled (#368). + +# 0.1.22 (June 3, 2019) + +* Fix rare panic when remote sends `RST_STREAM` or `GOAWAY` for a stream pending window capacity (#364). + +# 0.1.21 (May 30, 2019) + +* Fix write loop when a header didn't fit in write buffer. + +# 0.1.20 (May 16, 2019) + +* Fix lifetime conflict for older compilers. + +# 0.1.19 (May 15, 2019) + +* Fix rare crash if `CONTINUATION` frame resumed in the middle of headers with the same name. +* Fix HPACK encoder using an old evicted index for repeated header names. + +# 0.1.18 (April 9, 2019) + +* Fix `server::Connection::abrupt_shutdown` to no longer return the same error the user sent (#352). + +# 0.1.17 (March 12, 2019) + +* Add user PING support (#346). +* Fix notifying a `RecvStream` task if locally sending a reset. +* Fix connections "hanging" when all handles are dropped but some streams had been reset. + +# 0.1.16 (January 24, 2019) + +* Log header values when malformed (#342). + +# 0.1.15 (January 12, 2019) + +* Fix race condition bug related to shutting down the client (#338). + +# 0.1.14 (December 5, 2018) + +* Fix closed streams to always return window capacity to the connection (#334). +* Fix locking when `Debug` printing an `OpaqueStreamRef` (#333). +* Fix inverted split for DATA frame padding (#330). +* Reduce `Debug` noise for `Frame` (#329). + +# 0.1.13 (October 16, 2018) + +* Add client support for Push Promises (#314). +* Expose `io::Error` from `h2::Error` (#311) +* Misc bug fixes (#304, #309, #319, #313, #320). + +# 0.1.12 (August 8, 2018) + +* Fix initial send window size (#301). +* Fix panic when calling `reserve_capacity` after connection has been closed (#302). +* Fix handling of incoming `SETTINGS_INITIAL_WINDOW_SIZE`. (#299) + +# 0.1.11 (July 31, 2018) + +* Add `stream_id` accessors to public API types (#292). +* Fix potential panic when dropping clients (#295). +* Fix busy loop when shutting down server (#296). + +# 0.1.10 (June 15, 2018) + +* Fix potential panic in `SendRequest::poll_ready()` (#281). +* Fix infinite loop on reset connection during prefix (#285). + +# 0.1.9 (May 31, 2018) + +* Add `poll_reset` to `SendResponse` and `SendStream` (#279). + +# 0.1.8 (May 23, 2018) + +* Fix client bug when max streams is reached. (#277) + +# 0.1.7 (May 14, 2018) + +* Misc bug fixes (#266, #273, #261, #275). + +# 0.1.6 (April 24, 2018) + +* Misc bug fixes related to stream management (#258, #260, #262). + +# 0.1.5 (April 6, 2018) + +* Fix the `last_stream_id` sent during graceful GOAWAY (#254). + +# 0.1.4 (April 5, 2018) + +* Add `initial_connection_window_size` to client and server `Builder`s (#249). +* Add `graceful_shutdown` and `abrupt_shutdown` to `server::Connection`, + deprecating `close_connection` (#250). + +# 0.1.3 (March 28, 2018) + +* Allow configuring max streams before the peer's settings frame is + received (#242). +* Fix HPACK decoding bug with regards to large literals (#244). +* Fix state transition bug triggered by receiving a RST_STREAM frame (#247). + +# 0.1.2 (March 13, 2018) + +* Fix another bug relating to resetting connections and reaching + max concurrency (#238). + +# 0.1.1 (March 8, 2018) + +* When streams are dropped, close the connection (#222). +* Notify send tasks on connection error (#231). +* Fix bug relating to resetting connections and reaching max concurrency (#235). +* Normalize HTTP request path to satisfy HTTP/2.0 specification (#228). +* Update internal dependencies. + +# 0.1.0 (Jan 12, 2018) + +* Initial release diff --git a/third_party/rust/h2/CONTRIBUTING.md b/third_party/rust/h2/CONTRIBUTING.md new file mode 100644 index 0000000000..10e74bf290 --- /dev/null +++ b/third_party/rust/h2/CONTRIBUTING.md @@ -0,0 +1,84 @@ +# Contributing to _h2_ # + +:balloon: Thanks for your help improving the project! + +## Getting Help ## + +If you have a question about the h2 library or have encountered problems using it, you may +[file an issue][issue] or ask ask a question on the [Tokio Gitter][gitter]. + +## Submitting a Pull Request ## + +Do you have an improvement? + +1. Submit an [issue][issue] describing your proposed change. +2. We will try to respond to your issue promptly. +3. Fork this repo, develop and test your code changes. See the project's [README](README.md) for further information about working in this repository. +4. Submit a pull request against this repo's `master` branch. +6. Your branch may be merged once all configured checks pass, including: + - Code review has been completed. + - The branch has passed tests in CI. + +## Committing ## + +When initially submitting a pull request, we prefer a single squashed commit. It +is preferable to split up contributions into multiple pull requests if the +changes are unrelated. All pull requests are squashed when merged, but +squashing yourself gives you better control over the commit message. + +After the pull request is submitted, all changes should be done in separate +commits. This makes reviewing the evolution of the pull request easier. We will +squash all the changes into a single commit when we merge the pull request. + +### Commit messages ### + +Finalized commit messages should be in the following format: + +``` +Subject + +Problem + +Solution + +Validation +``` + +#### Subject #### + +- one line, <= 50 characters +- describe what is done; not the result +- use the active voice +- capitalize first word and proper nouns +- do not end in a period — this is a title/subject +- reference the github issue by number + +##### Examples ##### + +``` +bad: server disconnects should cause dst client disconnects. +good: Propagate disconnects from source to destination +``` + +``` +bad: support tls servers +good: Introduce support for server-side TLS (#347) +``` + +#### Problem #### + +Explain the context and why you're making that change. What is the problem +you're trying to solve? In some cases there is not a problem and this can be +thought of as being the motivation for your change. + +#### Solution #### + +Describe the modifications you've made. + +#### Validation #### + +Describe the testing you've done to validate your change. 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rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies. +# +# If you are reading this file be aware that the original Cargo.toml +# will likely look very different (and much more reasonable). +# See Cargo.toml.orig for the original contents. + +[package] +edition = "2018" +name = "h2" +version = "0.3.15" +authors = [ + "Carl Lerche <me@carllerche.com>", + "Sean McArthur <sean@seanmonstar.com>", +] +exclude = [ + "fixtures/**", + "ci/**", +] +description = "An HTTP/2 client and server" +documentation = "https://docs.rs/h2" +readme = "README.md" +keywords = [ + "http", + "async", + "non-blocking", +] +categories = [ + "asynchronous", + "web-programming", + "network-programming", +] +license = "MIT" +repository = "https://github.com/hyperium/h2" + +[package.metadata.docs.rs] +features = ["stream"] + +[dependencies.bytes] +version = "1" + +[dependencies.fnv] +version = "1.0.5" + +[dependencies.futures-core] +version = "0.3" +default-features = false + +[dependencies.futures-sink] +version = "0.3" +default-features = false + +[dependencies.futures-util] +version = "0.3" +default-features = false + +[dependencies.http] +version = "0.2" + +[dependencies.indexmap] +version = "1.5.2" +features = ["std"] + +[dependencies.slab] +version = "0.4.2" + +[dependencies.tokio] +version = "1" +features = ["io-util"] + +[dependencies.tokio-util] +version = "0.7.1" +features = ["codec"] + +[dependencies.tracing] +version = "0.1.21" +features = ["std"] +default-features = false + +[dev-dependencies.env_logger] +version = "0.9" +default-features = false + +[dev-dependencies.hex] +version = "0.4.3" + +[dev-dependencies.quickcheck] +version = "1.0.3" +default-features = false + +[dev-dependencies.rand] +version = "0.8.4" + +[dev-dependencies.serde] +version = "1.0.0" + +[dev-dependencies.serde_json] +version = "1.0.0" + +[dev-dependencies.tokio] +version = "1" +features = [ + "rt-multi-thread", + "macros", + "sync", + "net", +] + +[dev-dependencies.tokio-rustls] +version = "0.23.2" + +[dev-dependencies.walkdir] +version = "2.3.2" + +[dev-dependencies.webpki-roots] +version = "0.22.2" + +[features] +stream = [] +unstable = [] diff --git a/third_party/rust/h2/LICENSE b/third_party/rust/h2/LICENSE new file mode 100644 index 0000000000..11239dd1c1 --- /dev/null +++ b/third_party/rust/h2/LICENSE @@ -0,0 +1,25 @@ +Copyright (c) 2017 h2 authors + +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/h2/README.md b/third_party/rust/h2/README.md new file mode 100644 index 0000000000..2e15999149 --- /dev/null +++ b/third_party/rust/h2/README.md @@ -0,0 +1,71 @@ +# H2 + +A Tokio aware, HTTP/2 client & server implementation for Rust. + +[](https://opensource.org/licenses/MIT) +[](https://crates.io/crates/h2) +[][dox] + +More information about this crate can be found in the [crate documentation][dox]. + +[dox]: https://docs.rs/h2 + +## Features + +* Client and server HTTP/2 implementation. +* Implements the full HTTP/2 specification. +* Passes [h2spec](https://github.com/summerwind/h2spec). +* Focus on performance and correctness. +* Built on [Tokio](https://tokio.rs). + +## Non goals + +This crate is intended to only be an implementation of the HTTP/2 +specification. It does not handle: + +* Managing TCP connections +* HTTP 1.0 upgrade +* TLS +* Any feature not described by the HTTP/2 specification. + +This crate is now used by [hyper](https://github.com/hyperium/hyper), which will provide all of these features. + +## Usage + +To use `h2`, first add this to your `Cargo.toml`: + +```toml +[dependencies] +h2 = "0.3" +``` + +Next, add this to your crate: + +```rust +extern crate h2; + +use h2::server::Connection; + +fn main() { + // ... +} +``` + +## FAQ + +**How does h2 compare to [solicit] or [rust-http2]?** + +The h2 library has implemented more of the details of the HTTP/2 specification +than any other Rust library. It also passes the [h2spec] set of tests. The h2 +library is rapidly approaching "production ready" quality. + +Besides the above, Solicit is built on blocking I/O and does not appear to be +actively maintained. + +**Is this an embedded Java SQL database engine?** + +[No](https://www.h2database.com). + +[solicit]: https://github.com/mlalic/solicit +[rust-http2]: https://github.com/stepancheg/rust-http2 +[h2spec]: https://github.com/summerwind/h2spec diff --git a/third_party/rust/h2/examples/akamai.rs b/third_party/rust/h2/examples/akamai.rs new file mode 100644 index 0000000000..e522b37ff2 --- /dev/null +++ b/third_party/rust/h2/examples/akamai.rs @@ -0,0 +1,85 @@ +use h2::client; +use http::{Method, Request}; +use tokio::net::TcpStream; +use tokio_rustls::TlsConnector; + +use tokio_rustls::rustls::{OwnedTrustAnchor, RootCertStore, ServerName}; + +use std::convert::TryFrom; +use std::error::Error; +use std::net::ToSocketAddrs; + +const ALPN_H2: &str = "h2"; + +#[tokio::main] +pub async fn main() -> Result<(), Box<dyn Error>> { + let _ = env_logger::try_init(); + + let tls_client_config = std::sync::Arc::new({ + let mut root_store = RootCertStore::empty(); + root_store.add_server_trust_anchors(webpki_roots::TLS_SERVER_ROOTS.0.iter().map(|ta| { + OwnedTrustAnchor::from_subject_spki_name_constraints( + ta.subject, + ta.spki, + ta.name_constraints, + ) + })); + + let mut c = tokio_rustls::rustls::ClientConfig::builder() + .with_safe_defaults() + .with_root_certificates(root_store) + .with_no_client_auth(); + c.alpn_protocols.push(ALPN_H2.as_bytes().to_owned()); + c + }); + + // Sync DNS resolution. + let addr = "http2.akamai.com:443" + .to_socket_addrs() + .unwrap() + .next() + .unwrap(); + + println!("ADDR: {:?}", addr); + + let tcp = TcpStream::connect(&addr).await?; + let dns_name = ServerName::try_from("http2.akamai.com").unwrap(); + let connector = TlsConnector::from(tls_client_config); + let res = connector.connect(dns_name, tcp).await; + let tls = res.unwrap(); + { + let (_, session) = tls.get_ref(); + let negotiated_protocol = session.alpn_protocol(); + assert_eq!( + Some(ALPN_H2.as_bytes()), + negotiated_protocol.as_ref().map(|x| &**x) + ); + } + + println!("Starting client handshake"); + let (mut client, h2) = client::handshake(tls).await?; + + println!("building request"); + let request = Request::builder() + .method(Method::GET) + .uri("https://http2.akamai.com/") + .body(()) + .unwrap(); + + println!("sending request"); + let (response, other) = client.send_request(request, true).unwrap(); + + tokio::spawn(async move { + if let Err(e) = h2.await { + println!("GOT ERR={:?}", e); + } + }); + + println!("waiting on response : {:?}", other); + let (_, mut body) = response.await?.into_parts(); + println!("processing body"); + while let Some(chunk) = body.data().await { + println!("RX: {:?}", chunk?); + } + Ok(()) +} diff --git a/third_party/rust/h2/examples/client.rs b/third_party/rust/h2/examples/client.rs new file mode 100644 index 0000000000..61e237aa3c --- /dev/null +++ b/third_party/rust/h2/examples/client.rs @@ -0,0 +1,52 @@ +use h2::client; +use http::{HeaderMap, Request}; + +use std::error::Error; + +use tokio::net::TcpStream; + +#[tokio::main] +pub async fn main() -> Result<(), Box<dyn Error>> { + let _ = env_logger::try_init(); + + let tcp = TcpStream::connect("127.0.0.1:5928").await?; + let (mut client, h2) = client::handshake(tcp).await?; + + println!("sending request"); + + let request = Request::builder() + .uri("https://http2.akamai.com/") + .body(()) + .unwrap(); + + let mut trailers = HeaderMap::new(); + trailers.insert("zomg", "hello".parse().unwrap()); + + let (response, mut stream) = client.send_request(request, false).unwrap(); + + // send trailers + stream.send_trailers(trailers).unwrap(); + + // Spawn a task to run the conn... + tokio::spawn(async move { + if let Err(e) = h2.await { + println!("GOT ERR={:?}", e); + } + }); + + let response = response.await?; + println!("GOT RESPONSE: {:?}", response); + + // Get the body + let mut body = response.into_body(); + + while let Some(chunk) = body.data().await { + println!("GOT CHUNK = {:?}", chunk?); + } + + if let Some(trailers) = body.trailers().await? { + println!("GOT TRAILERS: {:?}", trailers); + } + + Ok(()) +} diff --git a/third_party/rust/h2/examples/server.rs b/third_party/rust/h2/examples/server.rs new file mode 100644 index 0000000000..6d6490db08 --- /dev/null +++ b/third_party/rust/h2/examples/server.rs @@ -0,0 +1,65 @@ +use std::error::Error; + +use bytes::Bytes; +use h2::server::{self, SendResponse}; +use h2::RecvStream; +use http::Request; +use tokio::net::{TcpListener, TcpStream}; + +#[tokio::main] +async fn main() -> Result<(), Box<dyn Error + Send + Sync>> { + let _ = env_logger::try_init(); + + let listener = TcpListener::bind("127.0.0.1:5928").await?; + + println!("listening on {:?}", listener.local_addr()); + + loop { + if let Ok((socket, _peer_addr)) = listener.accept().await { + tokio::spawn(async move { + if let Err(e) = serve(socket).await { + println!(" -> err={:?}", e); + } + }); + } + } +} + +async fn serve(socket: TcpStream) -> Result<(), Box<dyn Error + Send + Sync>> { + let mut connection = server::handshake(socket).await?; + println!("H2 connection bound"); + + while let Some(result) = connection.accept().await { + let (request, respond) = result?; + tokio::spawn(async move { + if let Err(e) = handle_request(request, respond).await { + println!("error while handling request: {}", e); + } + }); + } + + println!("~~~~~~~~~~~ H2 connection CLOSE !!!!!! ~~~~~~~~~~~"); + Ok(()) +} + +async fn handle_request( + mut request: Request<RecvStream>, + mut respond: SendResponse<Bytes>, +) -> Result<(), Box<dyn Error + Send + Sync>> { + println!("GOT request: {:?}", request); + + let body = request.body_mut(); + while let Some(data) = body.data().await { + let data = data?; + println!("<<<< recv {:?}", data); + let _ = body.flow_control().release_capacity(data.len()); + } + + let response = http::Response::new(()); + let mut send = respond.send_response(response, false)?; + println!(">>>> send"); + send.send_data(Bytes::from_static(b"hello "), false)?; + send.send_data(Bytes::from_static(b"world\n"), true)?; + + Ok(()) +} diff --git a/third_party/rust/h2/src/client.rs b/third_party/rust/h2/src/client.rs new file mode 100644 index 0000000000..a6c6498116 --- /dev/null +++ b/third_party/rust/h2/src/client.rs @@ -0,0 +1,1555 @@ +//! Client implementation of the HTTP/2 protocol. +//! +//! # Getting started +//! +//! Running an HTTP/2 client requires the caller to establish the underlying +//! connection as well as get the connection to a state that is ready to begin +//! the HTTP/2 handshake. See [here](../index.html#handshake) for more +//! details. +//! +//! This could be as basic as using Tokio's [`TcpStream`] to connect to a remote +//! host, but usually it means using either ALPN or HTTP/1.1 protocol upgrades. +//! +//! Once a connection is obtained, it is passed to [`handshake`], which will +//! begin the [HTTP/2 handshake]. This returns a future that completes once +//! the handshake process is performed and HTTP/2 streams may be initialized. +//! +//! [`handshake`] uses default configuration values. There are a number of +//! settings that can be changed by using [`Builder`] instead. +//! +//! Once the handshake future completes, the caller is provided with a +//! [`Connection`] instance and a [`SendRequest`] instance. The [`Connection`] +//! instance is used to drive the connection (see [Managing the connection]). +//! The [`SendRequest`] instance is used to initialize new streams (see [Making +//! requests]). +//! +//! # Making requests +//! +//! Requests are made using the [`SendRequest`] handle provided by the handshake +//! future. Once a request is submitted, an HTTP/2 stream is initialized and +//! the request is sent to the server. +//! +//! A request body and request trailers are sent using [`SendRequest`] and the +//! server's response is returned once the [`ResponseFuture`] future completes. +//! Both the [`SendStream`] and [`ResponseFuture`] instances are returned by +//! [`SendRequest::send_request`] and are tied to the HTTP/2 stream +//! initialized by the sent request. +//! +//! The [`SendRequest::poll_ready`] function returns `Ready` when a new HTTP/2 +//! stream can be created, i.e. as long as the current number of active streams +//! is below [`MAX_CONCURRENT_STREAMS`]. If a new stream cannot be created, the +//! caller will be notified once an existing stream closes, freeing capacity for +//! the caller. The caller should use [`SendRequest::poll_ready`] to check for +//! capacity before sending a request to the server. +//! +//! [`SendRequest`] enforces the [`MAX_CONCURRENT_STREAMS`] setting. The user +//! must not send a request if `poll_ready` does not return `Ready`. Attempting +//! to do so will result in an [`Error`] being returned. +//! +//! # Managing the connection +//! +//! The [`Connection`] instance is used to manage connection state. The caller +//! is required to call [`Connection::poll`] in order to advance state. +//! [`SendRequest::send_request`] and other functions have no effect unless +//! [`Connection::poll`] is called. +//! +//! The [`Connection`] instance should only be dropped once [`Connection::poll`] +//! returns `Ready`. At this point, the underlying socket has been closed and no +//! further work needs to be done. +//! +//! The easiest way to ensure that the [`Connection`] instance gets polled is to +//! submit the [`Connection`] instance to an [executor]. The executor will then +//! manage polling the connection until the connection is complete. +//! Alternatively, the caller can call `poll` manually. +//! +//! # Example +//! +//! ```rust, no_run +//! +//! use h2::client; +//! +//! use http::{Request, Method}; +//! use std::error::Error; +//! use tokio::net::TcpStream; +//! +//! #[tokio::main] +//! pub async fn main() -> Result<(), Box<dyn Error>> { +//! // Establish TCP connection to the server. +//! let tcp = TcpStream::connect("127.0.0.1:5928").await?; +//! let (h2, connection) = client::handshake(tcp).await?; +//! tokio::spawn(async move { +//! connection.await.unwrap(); +//! }); +//! +//! let mut h2 = h2.ready().await?; +//! // Prepare the HTTP request to send to the server. +//! let request = Request::builder() +//! .method(Method::GET) +//! .uri("https://www.example.com/") +//! .body(()) +//! .unwrap(); +//! +//! // Send the request. The second tuple item allows the caller +//! // to stream a request body. +//! let (response, _) = h2.send_request(request, true).unwrap(); +//! +//! let (head, mut body) = response.await?.into_parts(); +//! +//! println!("Received response: {:?}", head); +//! +//! // The `flow_control` handle allows the caller to manage +//! // flow control. +//! // +//! // Whenever data is received, the caller is responsible for +//! // releasing capacity back to the server once it has freed +//! // the data from memory. +//! let mut flow_control = body.flow_control().clone(); +//! +//! while let Some(chunk) = body.data().await { +//! let chunk = chunk?; +//! println!("RX: {:?}", chunk); +//! +//! // Let the server send more data. +//! let _ = flow_control.release_capacity(chunk.len()); +//! } +//! +//! Ok(()) +//! } +//! ``` +//! +//! [`TcpStream`]: https://docs.rs/tokio-core/0.1/tokio_core/net/struct.TcpStream.html +//! [`handshake`]: fn.handshake.html +//! [executor]: https://docs.rs/futures/0.1/futures/future/trait.Executor.html +//! [`SendRequest`]: struct.SendRequest.html +//! [`SendStream`]: ../struct.SendStream.html +//! [Making requests]: #making-requests +//! [Managing the connection]: #managing-the-connection +//! [`Connection`]: struct.Connection.html +//! [`Connection::poll`]: struct.Connection.html#method.poll +//! [`SendRequest::send_request`]: struct.SendRequest.html#method.send_request +//! [`MAX_CONCURRENT_STREAMS`]: http://httpwg.org/specs/rfc7540.html#SettingValues +//! [`SendRequest`]: struct.SendRequest.html +//! [`ResponseFuture`]: struct.ResponseFuture.html +//! [`SendRequest::poll_ready`]: struct.SendRequest.html#method.poll_ready +//! [HTTP/2 handshake]: http://httpwg.org/specs/rfc7540.html#ConnectionHeader +//! [`Builder`]: struct.Builder.html +//! [`Error`]: ../struct.Error.html + +use crate::codec::{Codec, SendError, UserError}; +use crate::ext::Protocol; +use crate::frame::{Headers, Pseudo, Reason, Settings, StreamId}; +use crate::proto::{self, Error}; +use crate::{FlowControl, PingPong, RecvStream, SendStream}; + +use bytes::{Buf, Bytes}; +use http::{uri, HeaderMap, Method, Request, Response, Version}; +use std::fmt; +use std::future::Future; +use std::pin::Pin; +use std::task::{Context, Poll}; +use std::time::Duration; +use std::usize; +use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt}; +use tracing::Instrument; + +/// Initializes new HTTP/2 streams on a connection by sending a request. +/// +/// This type does no work itself. Instead, it is a handle to the inner +/// connection state held by [`Connection`]. If the associated connection +/// instance is dropped, all `SendRequest` functions will return [`Error`]. +/// +/// [`SendRequest`] instances are able to move to and operate on separate tasks +/// / threads than their associated [`Connection`] instance. Internally, there +/// is a buffer used to stage requests before they get written to the +/// connection. There is no guarantee that requests get written to the +/// connection in FIFO order as HTTP/2 prioritization logic can play a role. +/// +/// [`SendRequest`] implements [`Clone`], enabling the creation of many +/// instances that are backed by a single connection. +/// +/// See [module] level documentation for more details. +/// +/// [module]: index.html +/// [`Connection`]: struct.Connection.html +/// [`Clone`]: https://doc.rust-lang.org/std/clone/trait.Clone.html +/// [`Error`]: ../struct.Error.html +pub struct SendRequest<B: Buf> { + inner: proto::Streams<B, Peer>, + pending: Option<proto::OpaqueStreamRef>, +} + +/// Returns a `SendRequest` instance once it is ready to send at least one +/// request. +#[derive(Debug)] +pub struct ReadySendRequest<B: Buf> { + inner: Option<SendRequest<B>>, +} + +/// Manages all state associated with an HTTP/2 client connection. +/// +/// A `Connection` is backed by an I/O resource (usually a TCP socket) and +/// implements the HTTP/2 client logic for that connection. It is responsible +/// for driving the internal state forward, performing the work requested of the +/// associated handles ([`SendRequest`], [`ResponseFuture`], [`SendStream`], +/// [`RecvStream`]). +/// +/// `Connection` values are created by calling [`handshake`]. Once a +/// `Connection` value is obtained, the caller must repeatedly call [`poll`] +/// until `Ready` is returned. The easiest way to do this is to submit the +/// `Connection` instance to an [executor]. +/// +/// [module]: index.html +/// [`handshake`]: fn.handshake.html +/// [`SendRequest`]: struct.SendRequest.html +/// [`ResponseFuture`]: struct.ResponseFuture.html +/// [`SendStream`]: ../struct.SendStream.html +/// [`RecvStream`]: ../struct.RecvStream.html +/// [`poll`]: #method.poll +/// [executor]: https://docs.rs/futures/0.1/futures/future/trait.Executor.html +/// +/// # Examples +/// +/// ``` +/// # use tokio::io::{AsyncRead, AsyncWrite}; +/// # use h2::client; +/// # use h2::client::*; +/// # +/// # async fn doc<T>(my_io: T) -> Result<(), h2::Error> +/// # where T: AsyncRead + AsyncWrite + Send + Unpin + 'static, +/// # { +/// let (send_request, connection) = client::handshake(my_io).await?; +/// // Submit the connection handle to an executor. +/// tokio::spawn(async { connection.await.expect("connection failed"); }); +/// +/// // Now, use `send_request` to initialize HTTP/2 streams. +/// // ... +/// # Ok(()) +/// # } +/// # +/// # pub fn main() {} +/// ``` +#[must_use = "futures do nothing unless polled"] +pub struct Connection<T, B: Buf = Bytes> { + inner: proto::Connection<T, Peer, B>, +} + +/// A future of an HTTP response. +#[derive(Debug)] +#[must_use = "futures do nothing unless polled"] +pub struct ResponseFuture { + inner: proto::OpaqueStreamRef, + push_promise_consumed: bool, +} + +/// A future of a pushed HTTP response. +/// +/// We have to differentiate between pushed and non pushed because of the spec +/// <https://httpwg.org/specs/rfc7540.html#PUSH_PROMISE> +/// > PUSH_PROMISE frames MUST only be sent on a peer-initiated stream +/// > that is in either the "open" or "half-closed (remote)" state. +#[derive(Debug)] +#[must_use = "futures do nothing unless polled"] +pub struct PushedResponseFuture { + inner: ResponseFuture, +} + +/// A pushed response and corresponding request headers +#[derive(Debug)] +pub struct PushPromise { + /// The request headers + request: Request<()>, + + /// The pushed response + response: PushedResponseFuture, +} + +/// A stream of pushed responses and corresponding promised requests +#[derive(Debug)] +#[must_use = "streams do nothing unless polled"] +pub struct PushPromises { + inner: proto::OpaqueStreamRef, +} + +/// Builds client connections with custom configuration values. +/// +/// Methods can be chained in order to set the configuration values. +/// +/// The client is constructed by calling [`handshake`] and passing the I/O +/// handle that will back the HTTP/2 server. +/// +/// New instances of `Builder` are obtained via [`Builder::new`]. +/// +/// See function level documentation for details on the various client +/// configuration settings. +/// +/// [`Builder::new`]: struct.Builder.html#method.new +/// [`handshake`]: struct.Builder.html#method.handshake +/// +/// # Examples +/// +/// ``` +/// # use tokio::io::{AsyncRead, AsyncWrite}; +/// # use h2::client::*; +/// # use bytes::Bytes; +/// # +/// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) +/// -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> +/// # { +/// // `client_fut` is a future representing the completion of the HTTP/2 +/// // handshake. +/// let client_fut = Builder::new() +/// .initial_window_size(1_000_000) +/// .max_concurrent_streams(1000) +/// .handshake(my_io); +/// # client_fut.await +/// # } +/// # +/// # pub fn main() {} +/// ``` +#[derive(Clone, Debug)] +pub struct Builder { + /// Time to keep locally reset streams around before reaping. + reset_stream_duration: Duration, + + /// Initial maximum number of locally initiated (send) streams. + /// After receiving a Settings frame from the remote peer, + /// the connection will overwrite this value with the + /// MAX_CONCURRENT_STREAMS specified in the frame. + initial_max_send_streams: usize, + + /// Initial target window size for new connections. + initial_target_connection_window_size: Option<u32>, + + /// Maximum amount of bytes to "buffer" for writing per stream. + max_send_buffer_size: usize, + + /// Maximum number of locally reset streams to keep at a time. + reset_stream_max: usize, + + /// Initial `Settings` frame to send as part of the handshake. + settings: Settings, + + /// The stream ID of the first (lowest) stream. Subsequent streams will use + /// monotonically increasing stream IDs. + stream_id: StreamId, +} + +#[derive(Debug)] +pub(crate) struct Peer; + +// ===== impl SendRequest ===== + +impl<B> SendRequest<B> +where + B: Buf + 'static, +{ + /// Returns `Ready` when the connection can initialize a new HTTP/2 + /// stream. + /// + /// This function must return `Ready` before `send_request` is called. When + /// `Poll::Pending` is returned, the task will be notified once the readiness + /// state changes. + /// + /// See [module] level docs for more details. + /// + /// [module]: index.html + pub fn poll_ready(&mut self, cx: &mut Context) -> Poll<Result<(), crate::Error>> { + ready!(self.inner.poll_pending_open(cx, self.pending.as_ref()))?; + self.pending = None; + Poll::Ready(Ok(())) + } + + /// Consumes `self`, returning a future that returns `self` back once it is + /// ready to send a request. + /// + /// This function should be called before calling `send_request`. + /// + /// This is a functional combinator for [`poll_ready`]. The returned future + /// will call `SendStream::poll_ready` until `Ready`, then returns `self` to + /// the caller. + /// + /// # Examples + /// + /// ```rust + /// # use h2::client::*; + /// # use http::*; + /// # async fn doc(send_request: SendRequest<&'static [u8]>) + /// # { + /// // First, wait until the `send_request` handle is ready to send a new + /// // request + /// let mut send_request = send_request.ready().await.unwrap(); + /// // Use `send_request` here. + /// # } + /// # pub fn main() {} + /// ``` + /// + /// See [module] level docs for more details. + /// + /// [`poll_ready`]: #method.poll_ready + /// [module]: index.html + pub fn ready(self) -> ReadySendRequest<B> { + ReadySendRequest { inner: Some(self) } + } + + /// Sends a HTTP/2 request to the server. + /// + /// `send_request` initializes a new HTTP/2 stream on the associated + /// connection, then sends the given request using this new stream. Only the + /// request head is sent. + /// + /// On success, a [`ResponseFuture`] instance and [`SendStream`] instance + /// are returned. The [`ResponseFuture`] instance is used to get the + /// server's response and the [`SendStream`] instance is used to send a + /// request body or trailers to the server over the same HTTP/2 stream. + /// + /// To send a request body or trailers, set `end_of_stream` to `false`. + /// Then, use the returned [`SendStream`] instance to stream request body + /// chunks or send trailers. If `end_of_stream` is **not** set to `false` + /// then attempting to call [`SendStream::send_data`] or + /// [`SendStream::send_trailers`] will result in an error. + /// + /// If no request body or trailers are to be sent, set `end_of_stream` to + /// `true` and drop the returned [`SendStream`] instance. + /// + /// # A note on HTTP versions + /// + /// The provided `Request` will be encoded differently depending on the + /// value of its version field. If the version is set to 2.0, then the + /// request is encoded as per the specification recommends. + /// + /// If the version is set to a lower value, then the request is encoded to + /// preserve the characteristics of HTTP 1.1 and lower. Specifically, host + /// headers are permitted and the `:authority` pseudo header is not + /// included. + /// + /// The caller should always set the request's version field to 2.0 unless + /// specifically transmitting an HTTP 1.1 request over 2.0. + /// + /// # Examples + /// + /// Sending a request with no body + /// + /// ```rust + /// # use h2::client::*; + /// # use http::*; + /// # async fn doc(send_request: SendRequest<&'static [u8]>) + /// # { + /// // First, wait until the `send_request` handle is ready to send a new + /// // request + /// let mut send_request = send_request.ready().await.unwrap(); + /// // Prepare the HTTP request to send to the server. + /// let request = Request::get("https://www.example.com/") + /// .body(()) + /// .unwrap(); + /// + /// // Send the request to the server. Since we are not sending a + /// // body or trailers, we can drop the `SendStream` instance. + /// let (response, _) = send_request.send_request(request, true).unwrap(); + /// let response = response.await.unwrap(); + /// // Process the response + /// # } + /// # pub fn main() {} + /// ``` + /// + /// Sending a request with a body and trailers + /// + /// ```rust + /// # use h2::client::*; + /// # use http::*; + /// # async fn doc(send_request: SendRequest<&'static [u8]>) + /// # { + /// // First, wait until the `send_request` handle is ready to send a new + /// // request + /// let mut send_request = send_request.ready().await.unwrap(); + /// + /// // Prepare the HTTP request to send to the server. + /// let request = Request::get("https://www.example.com/") + /// .body(()) + /// .unwrap(); + /// + /// // Send the request to the server. If we are not sending a + /// // body or trailers, we can drop the `SendStream` instance. + /// let (response, mut send_stream) = send_request + /// .send_request(request, false).unwrap(); + /// + /// // At this point, one option would be to wait for send capacity. + /// // Doing so would allow us to not hold data in memory that + /// // cannot be sent. However, this is not a requirement, so this + /// // example will skip that step. See `SendStream` documentation + /// // for more details. + /// send_stream.send_data(b"hello", false).unwrap(); + /// send_stream.send_data(b"world", false).unwrap(); + /// + /// // Send the trailers. + /// let mut trailers = HeaderMap::new(); + /// trailers.insert( + /// header::HeaderName::from_bytes(b"my-trailer").unwrap(), + /// header::HeaderValue::from_bytes(b"hello").unwrap()); + /// + /// send_stream.send_trailers(trailers).unwrap(); + /// + /// let response = response.await.unwrap(); + /// // Process the response + /// # } + /// # pub fn main() {} + /// ``` + /// + /// [`ResponseFuture`]: struct.ResponseFuture.html + /// [`SendStream`]: ../struct.SendStream.html + /// [`SendStream::send_data`]: ../struct.SendStream.html#method.send_data + /// [`SendStream::send_trailers`]: ../struct.SendStream.html#method.send_trailers + pub fn send_request( + &mut self, + request: Request<()>, + end_of_stream: bool, + ) -> Result<(ResponseFuture, SendStream<B>), crate::Error> { + self.inner + .send_request(request, end_of_stream, self.pending.as_ref()) + .map_err(Into::into) + .map(|stream| { + if stream.is_pending_open() { + self.pending = Some(stream.clone_to_opaque()); + } + + let response = ResponseFuture { + inner: stream.clone_to_opaque(), + push_promise_consumed: false, + }; + + let stream = SendStream::new(stream); + + (response, stream) + }) + } + + /// Returns whether the [extended CONNECT protocol][1] is enabled or not. + /// + /// This setting is configured by the server peer by sending the + /// [`SETTINGS_ENABLE_CONNECT_PROTOCOL` parameter][2] in a `SETTINGS` frame. + /// This method returns the currently acknowledged value received from the + /// remote. + /// + /// [1]: https://datatracker.ietf.org/doc/html/rfc8441#section-4 + /// [2]: https://datatracker.ietf.org/doc/html/rfc8441#section-3 + pub fn is_extended_connect_protocol_enabled(&self) -> bool { + self.inner.is_extended_connect_protocol_enabled() + } +} + +impl<B> fmt::Debug for SendRequest<B> +where + B: Buf, +{ + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + fmt.debug_struct("SendRequest").finish() + } +} + +impl<B> Clone for SendRequest<B> +where + B: Buf, +{ + fn clone(&self) -> Self { + SendRequest { + inner: self.inner.clone(), + pending: None, + } + } +} + +#[cfg(feature = "unstable")] +impl<B> SendRequest<B> +where + B: Buf, +{ + /// Returns the number of active streams. + /// + /// An active stream is a stream that has not yet transitioned to a closed + /// state. + pub fn num_active_streams(&self) -> usize { + self.inner.num_active_streams() + } + + /// Returns the number of streams that are held in memory. + /// + /// A wired stream is a stream that is either active or is closed but must + /// stay in memory for some reason. For example, there are still outstanding + /// userspace handles pointing to the slot. + pub fn num_wired_streams(&self) -> usize { + self.inner.num_wired_streams() + } +} + +// ===== impl ReadySendRequest ===== + +impl<B> Future for ReadySendRequest<B> +where + B: Buf + 'static, +{ + type Output = Result<SendRequest<B>, crate::Error>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { + match &mut self.inner { + Some(send_request) => { + ready!(send_request.poll_ready(cx))?; + } + None => panic!("called `poll` after future completed"), + } + + Poll::Ready(Ok(self.inner.take().unwrap())) + } +} + +// ===== impl Builder ===== + +impl Builder { + /// Returns a new client builder instance initialized with default + /// configuration values. + /// + /// Configuration methods can be chained on the return value. + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # use bytes::Bytes; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .initial_window_size(1_000_000) + /// .max_concurrent_streams(1000) + /// .handshake(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn new() -> Builder { + Builder { + max_send_buffer_size: proto::DEFAULT_MAX_SEND_BUFFER_SIZE, + reset_stream_duration: Duration::from_secs(proto::DEFAULT_RESET_STREAM_SECS), + reset_stream_max: proto::DEFAULT_RESET_STREAM_MAX, + initial_target_connection_window_size: None, + initial_max_send_streams: usize::MAX, + settings: Default::default(), + stream_id: 1.into(), + } + } + + /// Indicates the initial window size (in octets) for stream-level + /// flow control for received data. + /// + /// The initial window of a stream is used as part of flow control. For more + /// details, see [`FlowControl`]. + /// + /// The default value is 65,535. + /// + /// [`FlowControl`]: ../struct.FlowControl.html + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # use bytes::Bytes; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .initial_window_size(1_000_000) + /// .handshake(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn initial_window_size(&mut self, size: u32) -> &mut Self { + self.settings.set_initial_window_size(Some(size)); + self + } + + /// Indicates the initial window size (in octets) for connection-level flow control + /// for received data. + /// + /// The initial window of a connection is used as part of flow control. For more details, + /// see [`FlowControl`]. + /// + /// The default value is 65,535. + /// + /// [`FlowControl`]: ../struct.FlowControl.html + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # use bytes::Bytes; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .initial_connection_window_size(1_000_000) + /// .handshake(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn initial_connection_window_size(&mut self, size: u32) -> &mut Self { + self.initial_target_connection_window_size = Some(size); + self + } + + /// Indicates the size (in octets) of the largest HTTP/2 frame payload that the + /// configured client is able to accept. + /// + /// The sender may send data frames that are **smaller** than this value, + /// but any data larger than `max` will be broken up into multiple `DATA` + /// frames. + /// + /// The value **must** be between 16,384 and 16,777,215. The default value is 16,384. + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # use bytes::Bytes; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .max_frame_size(1_000_000) + /// .handshake(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + /// + /// # Panics + /// + /// This function panics if `max` is not within the legal range specified + /// above. + pub fn max_frame_size(&mut self, max: u32) -> &mut Self { + self.settings.set_max_frame_size(Some(max)); + self + } + + /// Sets the max size of received header frames. + /// + /// This advisory setting informs a peer of the maximum size of header list + /// that the sender is prepared to accept, in octets. The value is based on + /// the uncompressed size of header fields, including the length of the name + /// and value in octets plus an overhead of 32 octets for each header field. + /// + /// This setting is also used to limit the maximum amount of data that is + /// buffered to decode HEADERS frames. + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # use bytes::Bytes; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .max_header_list_size(16 * 1024) + /// .handshake(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn max_header_list_size(&mut self, max: u32) -> &mut Self { + self.settings.set_max_header_list_size(Some(max)); + self + } + + /// Sets the maximum number of concurrent streams. + /// + /// The maximum concurrent streams setting only controls the maximum number + /// of streams that can be initiated by the remote peer. In other words, + /// when this setting is set to 100, this does not limit the number of + /// concurrent streams that can be created by the caller. + /// + /// It is recommended that this value be no smaller than 100, so as to not + /// unnecessarily limit parallelism. However, any value is legal, including + /// 0. If `max` is set to 0, then the remote will not be permitted to + /// initiate streams. + /// + /// Note that streams in the reserved state, i.e., push promises that have + /// been reserved but the stream has not started, do not count against this + /// setting. + /// + /// Also note that if the remote *does* exceed the value set here, it is not + /// a protocol level error. Instead, the `h2` library will immediately reset + /// the stream. + /// + /// See [Section 5.1.2] in the HTTP/2 spec for more details. + /// + /// [Section 5.1.2]: https://http2.github.io/http2-spec/#rfc.section.5.1.2 + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # use bytes::Bytes; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .max_concurrent_streams(1000) + /// .handshake(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn max_concurrent_streams(&mut self, max: u32) -> &mut Self { + self.settings.set_max_concurrent_streams(Some(max)); + self + } + + /// Sets the initial maximum of locally initiated (send) streams. + /// + /// The initial settings will be overwritten by the remote peer when + /// the Settings frame is received. The new value will be set to the + /// `max_concurrent_streams()` from the frame. + /// + /// This setting prevents the caller from exceeding this number of + /// streams that are counted towards the concurrency limit. + /// + /// Sending streams past the limit returned by the peer will be treated + /// as a stream error of type PROTOCOL_ERROR or REFUSED_STREAM. + /// + /// See [Section 5.1.2] in the HTTP/2 spec for more details. + /// + /// [Section 5.1.2]: https://http2.github.io/http2-spec/#rfc.section.5.1.2 + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # use bytes::Bytes; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .initial_max_send_streams(1000) + /// .handshake(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn initial_max_send_streams(&mut self, initial: usize) -> &mut Self { + self.initial_max_send_streams = initial; + self + } + + /// Sets the maximum number of concurrent locally reset streams. + /// + /// When a stream is explicitly reset, the HTTP/2 specification requires + /// that any further frames received for that stream must be ignored for + /// "some time". + /// + /// In order to satisfy the specification, internal state must be maintained + /// to implement the behavior. This state grows linearly with the number of + /// streams that are locally reset. + /// + /// The `max_concurrent_reset_streams` setting configures sets an upper + /// bound on the amount of state that is maintained. When this max value is + /// reached, the oldest reset stream is purged from memory. + /// + /// Once the stream has been fully purged from memory, any additional frames + /// received for that stream will result in a connection level protocol + /// error, forcing the connection to terminate. + /// + /// The default value is 10. + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # use bytes::Bytes; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .max_concurrent_reset_streams(1000) + /// .handshake(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn max_concurrent_reset_streams(&mut self, max: usize) -> &mut Self { + self.reset_stream_max = max; + self + } + + /// Sets the duration to remember locally reset streams. + /// + /// When a stream is explicitly reset, the HTTP/2 specification requires + /// that any further frames received for that stream must be ignored for + /// "some time". + /// + /// In order to satisfy the specification, internal state must be maintained + /// to implement the behavior. This state grows linearly with the number of + /// streams that are locally reset. + /// + /// The `reset_stream_duration` setting configures the max amount of time + /// this state will be maintained in memory. Once the duration elapses, the + /// stream state is purged from memory. + /// + /// Once the stream has been fully purged from memory, any additional frames + /// received for that stream will result in a connection level protocol + /// error, forcing the connection to terminate. + /// + /// The default value is 30 seconds. + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # use std::time::Duration; + /// # use bytes::Bytes; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .reset_stream_duration(Duration::from_secs(10)) + /// .handshake(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn reset_stream_duration(&mut self, dur: Duration) -> &mut Self { + self.reset_stream_duration = dur; + self + } + + /// Sets the maximum send buffer size per stream. + /// + /// Once a stream has buffered up to (or over) the maximum, the stream's + /// flow control will not "poll" additional capacity. Once bytes for the + /// stream have been written to the connection, the send buffer capacity + /// will be freed up again. + /// + /// The default is currently ~400MB, but may change. + /// + /// # Panics + /// + /// This function panics if `max` is larger than `u32::MAX`. + pub fn max_send_buffer_size(&mut self, max: usize) -> &mut Self { + assert!(max <= std::u32::MAX as usize); + self.max_send_buffer_size = max; + self + } + + /// Enables or disables server push promises. + /// + /// This value is included in the initial SETTINGS handshake. When set, the + /// server MUST NOT send a push promise. Setting this value to value to + /// false in the initial SETTINGS handshake guarantees that the remote server + /// will never send a push promise. + /// + /// This setting can be changed during the life of a single HTTP/2 + /// connection by sending another settings frame updating the value. + /// + /// Default value: `true`. + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # use std::time::Duration; + /// # use bytes::Bytes; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .enable_push(false) + /// .handshake(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn enable_push(&mut self, enabled: bool) -> &mut Self { + self.settings.set_enable_push(enabled); + self + } + + /// Sets the first stream ID to something other than 1. + #[cfg(feature = "unstable")] + pub fn initial_stream_id(&mut self, stream_id: u32) -> &mut Self { + self.stream_id = stream_id.into(); + assert!( + self.stream_id.is_client_initiated(), + "stream id must be odd" + ); + self + } + + /// Creates a new configured HTTP/2 client backed by `io`. + /// + /// It is expected that `io` already be in an appropriate state to commence + /// the [HTTP/2 handshake]. The handshake is completed once both the connection + /// preface and the initial settings frame is sent by the client. + /// + /// The handshake future does not wait for the initial settings frame from the + /// server. + /// + /// Returns a future which resolves to the [`Connection`] / [`SendRequest`] + /// tuple once the HTTP/2 handshake has been completed. + /// + /// This function also allows the caller to configure the send payload data + /// type. See [Outbound data type] for more details. + /// + /// [HTTP/2 handshake]: http://httpwg.org/specs/rfc7540.html#ConnectionHeader + /// [`Connection`]: struct.Connection.html + /// [`SendRequest`]: struct.SendRequest.html + /// [Outbound data type]: ../index.html#outbound-data-type. + /// + /// # Examples + /// + /// Basic usage: + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # use bytes::Bytes; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// -> Result<((SendRequest<Bytes>, Connection<T, Bytes>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .handshake(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + /// + /// Configures the send-payload data type. In this case, the outbound data + /// type will be `&'static [u8]`. + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::client::*; + /// # + /// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Result<((SendRequest<&'static [u8]>, Connection<T, &'static [u8]>)), h2::Error> + /// # { + /// // `client_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let client_fut = Builder::new() + /// .handshake::<_, &'static [u8]>(my_io); + /// # client_fut.await + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn handshake<T, B>( + &self, + io: T, + ) -> impl Future<Output = Result<(SendRequest<B>, Connection<T, B>), crate::Error>> + where + T: AsyncRead + AsyncWrite + Unpin, + B: Buf + 'static, + { + Connection::handshake2(io, self.clone()) + } +} + +impl Default for Builder { + fn default() -> Builder { + Builder::new() + } +} + +/// Creates a new configured HTTP/2 client with default configuration +/// values backed by `io`. +/// +/// It is expected that `io` already be in an appropriate state to commence +/// the [HTTP/2 handshake]. See [Handshake] for more details. +/// +/// Returns a future which resolves to the [`Connection`] / [`SendRequest`] +/// tuple once the HTTP/2 handshake has been completed. The returned +/// [`Connection`] instance will be using default configuration values. Use +/// [`Builder`] to customize the configuration values used by a [`Connection`] +/// instance. +/// +/// [HTTP/2 handshake]: http://httpwg.org/specs/rfc7540.html#ConnectionHeader +/// [Handshake]: ../index.html#handshake +/// [`Connection`]: struct.Connection.html +/// [`SendRequest`]: struct.SendRequest.html +/// +/// # Examples +/// +/// ``` +/// # use tokio::io::{AsyncRead, AsyncWrite}; +/// # use h2::client; +/// # use h2::client::*; +/// # +/// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) -> Result<(), h2::Error> +/// # { +/// let (send_request, connection) = client::handshake(my_io).await?; +/// // The HTTP/2 handshake has completed, now start polling +/// // `connection` and use `send_request` to send requests to the +/// // server. +/// # Ok(()) +/// # } +/// # +/// # pub fn main() {} +/// ``` +pub async fn handshake<T>(io: T) -> Result<(SendRequest<Bytes>, Connection<T, Bytes>), crate::Error> +where + T: AsyncRead + AsyncWrite + Unpin, +{ + let builder = Builder::new(); + builder + .handshake(io) + .instrument(tracing::trace_span!("client_handshake")) + .await +} + +// ===== impl Connection ===== + +async fn bind_connection<T>(io: &mut T) -> Result<(), crate::Error> +where + T: AsyncRead + AsyncWrite + Unpin, +{ + tracing::debug!("binding client connection"); + + let msg: &'static [u8] = b"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"; + io.write_all(msg).await.map_err(crate::Error::from_io)?; + + tracing::debug!("client connection bound"); + + Ok(()) +} + +impl<T, B> Connection<T, B> +where + T: AsyncRead + AsyncWrite + Unpin, + B: Buf + 'static, +{ + async fn handshake2( + mut io: T, + builder: Builder, + ) -> Result<(SendRequest<B>, Connection<T, B>), crate::Error> { + bind_connection(&mut io).await?; + + // Create the codec + let mut codec = Codec::new(io); + + if let Some(max) = builder.settings.max_frame_size() { + codec.set_max_recv_frame_size(max as usize); + } + + if let Some(max) = builder.settings.max_header_list_size() { + codec.set_max_recv_header_list_size(max as usize); + } + + // Send initial settings frame + codec + .buffer(builder.settings.clone().into()) + .expect("invalid SETTINGS frame"); + + let inner = proto::Connection::new( + codec, + proto::Config { + next_stream_id: builder.stream_id, + initial_max_send_streams: builder.initial_max_send_streams, + max_send_buffer_size: builder.max_send_buffer_size, + reset_stream_duration: builder.reset_stream_duration, + reset_stream_max: builder.reset_stream_max, + settings: builder.settings.clone(), + }, + ); + let send_request = SendRequest { + inner: inner.streams().clone(), + pending: None, + }; + + let mut connection = Connection { inner }; + if let Some(sz) = builder.initial_target_connection_window_size { + connection.set_target_window_size(sz); + } + + Ok((send_request, connection)) + } + + /// Sets the target window size for the whole connection. + /// + /// If `size` is greater than the current value, then a `WINDOW_UPDATE` + /// frame will be immediately sent to the remote, increasing the connection + /// level window by `size - current_value`. + /// + /// If `size` is less than the current value, nothing will happen + /// immediately. However, as window capacity is released by + /// [`FlowControl`] instances, no `WINDOW_UPDATE` frames will be sent + /// out until the number of "in flight" bytes drops below `size`. + /// + /// The default value is 65,535. + /// + /// See [`FlowControl`] documentation for more details. + /// + /// [`FlowControl`]: ../struct.FlowControl.html + /// [library level]: ../index.html#flow-control + pub fn set_target_window_size(&mut self, size: u32) { + assert!(size <= proto::MAX_WINDOW_SIZE); + self.inner.set_target_window_size(size); + } + + /// Set a new `INITIAL_WINDOW_SIZE` setting (in octets) for stream-level + /// flow control for received data. + /// + /// The `SETTINGS` will be sent to the remote, and only applied once the + /// remote acknowledges the change. + /// + /// This can be used to increase or decrease the window size for existing + /// streams. + /// + /// # Errors + /// + /// Returns an error if a previous call is still pending acknowledgement + /// from the remote endpoint. + pub fn set_initial_window_size(&mut self, size: u32) -> Result<(), crate::Error> { + assert!(size <= proto::MAX_WINDOW_SIZE); + self.inner.set_initial_window_size(size)?; + Ok(()) + } + + /// Takes a `PingPong` instance from the connection. + /// + /// # Note + /// + /// This may only be called once. Calling multiple times will return `None`. + pub fn ping_pong(&mut self) -> Option<PingPong> { + self.inner.take_user_pings().map(PingPong::new) + } + + /// Returns the maximum number of concurrent streams that may be initiated + /// by this client. + /// + /// This limit is configured by the server peer by sending the + /// [`SETTINGS_MAX_CONCURRENT_STREAMS` parameter][1] in a `SETTINGS` frame. + /// This method returns the currently acknowledged value received from the + /// remote. + /// + /// [1]: https://tools.ietf.org/html/rfc7540#section-5.1.2 + pub fn max_concurrent_send_streams(&self) -> usize { + self.inner.max_send_streams() + } + /// Returns the maximum number of concurrent streams that may be initiated + /// by the server on this connection. + /// + /// This returns the value of the [`SETTINGS_MAX_CONCURRENT_STREAMS` + /// parameter][1] sent in a `SETTINGS` frame that has been + /// acknowledged by the remote peer. The value to be sent is configured by + /// the [`Builder::max_concurrent_streams`][2] method before handshaking + /// with the remote peer. + /// + /// [1]: https://tools.ietf.org/html/rfc7540#section-5.1.2 + /// [2]: ../struct.Builder.html#method.max_concurrent_streams + pub fn max_concurrent_recv_streams(&self) -> usize { + self.inner.max_recv_streams() + } +} + +impl<T, B> Future for Connection<T, B> +where + T: AsyncRead + AsyncWrite + Unpin, + B: Buf + 'static, +{ + type Output = Result<(), crate::Error>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { + self.inner.maybe_close_connection_if_no_streams(); + self.inner.poll(cx).map_err(Into::into) + } +} + +impl<T, B> fmt::Debug for Connection<T, B> +where + T: AsyncRead + AsyncWrite, + T: fmt::Debug, + B: fmt::Debug + Buf, +{ + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + fmt::Debug::fmt(&self.inner, fmt) + } +} + +// ===== impl ResponseFuture ===== + +impl Future for ResponseFuture { + type Output = Result<Response<RecvStream>, crate::Error>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { + let (parts, _) = ready!(self.inner.poll_response(cx))?.into_parts(); + let body = RecvStream::new(FlowControl::new(self.inner.clone())); + + Poll::Ready(Ok(Response::from_parts(parts, body))) + } +} + +impl ResponseFuture { + /// Returns the stream ID of the response stream. + /// + /// # Panics + /// + /// If the lock on the stream store has been poisoned. + pub fn stream_id(&self) -> crate::StreamId { + crate::StreamId::from_internal(self.inner.stream_id()) + } + /// Returns a stream of PushPromises + /// + /// # Panics + /// + /// If this method has been called before + /// or the stream was itself was pushed + pub fn push_promises(&mut self) -> PushPromises { + if self.push_promise_consumed { + panic!("Reference to push promises stream taken!"); + } + self.push_promise_consumed = true; + PushPromises { + inner: self.inner.clone(), + } + } +} + +// ===== impl PushPromises ===== + +impl PushPromises { + /// Get the next `PushPromise`. + pub async fn push_promise(&mut self) -> Option<Result<PushPromise, crate::Error>> { + futures_util::future::poll_fn(move |cx| self.poll_push_promise(cx)).await + } + + #[doc(hidden)] + pub fn poll_push_promise( + &mut self, + cx: &mut Context<'_>, + ) -> Poll<Option<Result<PushPromise, crate::Error>>> { + match self.inner.poll_pushed(cx) { + Poll::Ready(Some(Ok((request, response)))) => { + let response = PushedResponseFuture { + inner: ResponseFuture { + inner: response, + push_promise_consumed: false, + }, + }; + Poll::Ready(Some(Ok(PushPromise { request, response }))) + } + Poll::Ready(Some(Err(e))) => Poll::Ready(Some(Err(e.into()))), + Poll::Ready(None) => Poll::Ready(None), + Poll::Pending => Poll::Pending, + } + } +} + +#[cfg(feature = "stream")] +impl futures_core::Stream for PushPromises { + type Item = Result<PushPromise, crate::Error>; + + fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> { + self.poll_push_promise(cx) + } +} + +// ===== impl PushPromise ===== + +impl PushPromise { + /// Returns a reference to the push promise's request headers. + pub fn request(&self) -> &Request<()> { + &self.request + } + + /// Returns a mutable reference to the push promise's request headers. + pub fn request_mut(&mut self) -> &mut Request<()> { + &mut self.request + } + + /// Consumes `self`, returning the push promise's request headers and + /// response future. + pub fn into_parts(self) -> (Request<()>, PushedResponseFuture) { + (self.request, self.response) + } +} + +// ===== impl PushedResponseFuture ===== + +impl Future for PushedResponseFuture { + type Output = Result<Response<RecvStream>, crate::Error>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { + Pin::new(&mut self.inner).poll(cx) + } +} + +impl PushedResponseFuture { + /// Returns the stream ID of the response stream. + /// + /// # Panics + /// + /// If the lock on the stream store has been poisoned. + pub fn stream_id(&self) -> crate::StreamId { + self.inner.stream_id() + } +} + +// ===== impl Peer ===== + +impl Peer { + pub fn convert_send_message( + id: StreamId, + request: Request<()>, + protocol: Option<Protocol>, + end_of_stream: bool, + ) -> Result<Headers, SendError> { + use http::request::Parts; + + let ( + Parts { + method, + uri, + headers, + version, + .. + }, + _, + ) = request.into_parts(); + + let is_connect = method == Method::CONNECT; + + // Build the set pseudo header set. All requests will include `method` + // and `path`. + let mut pseudo = Pseudo::request(method, uri, protocol); + + if pseudo.scheme.is_none() { + // If the scheme is not set, then there are a two options. + // + // 1) Authority is not set. In this case, a request was issued with + // a relative URI. This is permitted **only** when forwarding + // HTTP 1.x requests. If the HTTP version is set to 2.0, then + // this is an error. + // + // 2) Authority is set, then the HTTP method *must* be CONNECT. + // + // It is not possible to have a scheme but not an authority set (the + // `http` crate does not allow it). + // + if pseudo.authority.is_none() { + if version == Version::HTTP_2 { + return Err(UserError::MissingUriSchemeAndAuthority.into()); + } else { + // This is acceptable as per the above comment. However, + // HTTP/2 requires that a scheme is set. Since we are + // forwarding an HTTP 1.1 request, the scheme is set to + // "http". + pseudo.set_scheme(uri::Scheme::HTTP); + } + } else if !is_connect { + // TODO: Error + } + } + + // Create the HEADERS frame + let mut frame = Headers::new(id, pseudo, headers); + + if end_of_stream { + frame.set_end_stream() + } + + Ok(frame) + } +} + +impl proto::Peer for Peer { + type Poll = Response<()>; + + const NAME: &'static str = "Client"; + + fn r#dyn() -> proto::DynPeer { + proto::DynPeer::Client + } + + fn is_server() -> bool { + false + } + + fn convert_poll_message( + pseudo: Pseudo, + fields: HeaderMap, + stream_id: StreamId, + ) -> Result<Self::Poll, Error> { + let mut b = Response::builder(); + + b = b.version(Version::HTTP_2); + + if let Some(status) = pseudo.status { + b = b.status(status); + } + + let mut response = match b.body(()) { + Ok(response) => response, + Err(_) => { + // TODO: Should there be more specialized handling for different + // kinds of errors + return Err(Error::library_reset(stream_id, Reason::PROTOCOL_ERROR)); + } + }; + + *response.headers_mut() = fields; + + Ok(response) + } +} diff --git a/third_party/rust/h2/src/codec/error.rs b/third_party/rust/h2/src/codec/error.rs new file mode 100644 index 0000000000..0acb913e52 --- /dev/null +++ b/third_party/rust/h2/src/codec/error.rs @@ -0,0 +1,102 @@ +use crate::proto::Error; + +use std::{error, fmt, io}; + +/// Errors caused by sending a message +#[derive(Debug)] +pub enum SendError { + Connection(Error), + User(UserError), +} + +/// Errors caused by users of the library +#[derive(Debug)] +pub enum UserError { + /// The stream ID is no longer accepting frames. + InactiveStreamId, + + /// The stream is not currently expecting a frame of this type. + UnexpectedFrameType, + + /// The payload size is too big + PayloadTooBig, + + /// The application attempted to initiate too many streams to remote. + Rejected, + + /// The released capacity is larger than claimed capacity. + ReleaseCapacityTooBig, + + /// The stream ID space is overflowed. + /// + /// A new connection is needed. + OverflowedStreamId, + + /// Illegal headers, such as connection-specific headers. + MalformedHeaders, + + /// Request submitted with relative URI. + MissingUriSchemeAndAuthority, + + /// Calls `SendResponse::poll_reset` after having called `send_response`. + PollResetAfterSendResponse, + + /// Calls `PingPong::send_ping` before receiving a pong. + SendPingWhilePending, + + /// Tries to update local SETTINGS while ACK has not been received. + SendSettingsWhilePending, + + /// Tries to send push promise to peer who has disabled server push + PeerDisabledServerPush, +} + +// ===== impl SendError ===== + +impl error::Error for SendError {} + +impl fmt::Display for SendError { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + match *self { + Self::Connection(ref e) => e.fmt(fmt), + Self::User(ref e) => e.fmt(fmt), + } + } +} + +impl From<io::Error> for SendError { + fn from(src: io::Error) -> Self { + Self::Connection(src.into()) + } +} + +impl From<UserError> for SendError { + fn from(src: UserError) -> Self { + SendError::User(src) + } +} + +// ===== impl UserError ===== + +impl error::Error for UserError {} + +impl fmt::Display for UserError { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + use self::UserError::*; + + fmt.write_str(match *self { + InactiveStreamId => "inactive stream", + UnexpectedFrameType => "unexpected frame type", + PayloadTooBig => "payload too big", + Rejected => "rejected", + ReleaseCapacityTooBig => "release capacity too big", + OverflowedStreamId => "stream ID overflowed", + MalformedHeaders => "malformed headers", + MissingUriSchemeAndAuthority => "request URI missing scheme and authority", + PollResetAfterSendResponse => "poll_reset after send_response is illegal", + SendPingWhilePending => "send_ping before received previous pong", + SendSettingsWhilePending => "sending SETTINGS before received previous ACK", + PeerDisabledServerPush => "sending PUSH_PROMISE to peer who disabled server push", + }) + } +} diff --git a/third_party/rust/h2/src/codec/framed_read.rs b/third_party/rust/h2/src/codec/framed_read.rs new file mode 100644 index 0000000000..7c3bbb3ba2 --- /dev/null +++ b/third_party/rust/h2/src/codec/framed_read.rs @@ -0,0 +1,415 @@ +use crate::frame::{self, Frame, Kind, Reason}; +use crate::frame::{ + DEFAULT_MAX_FRAME_SIZE, DEFAULT_SETTINGS_HEADER_TABLE_SIZE, MAX_MAX_FRAME_SIZE, +}; +use crate::proto::Error; + +use crate::hpack; + +use futures_core::Stream; + +use bytes::BytesMut; + +use std::io; + +use std::pin::Pin; +use std::task::{Context, Poll}; +use tokio::io::AsyncRead; +use tokio_util::codec::FramedRead as InnerFramedRead; +use tokio_util::codec::{LengthDelimitedCodec, LengthDelimitedCodecError}; + +// 16 MB "sane default" taken from golang http2 +const DEFAULT_SETTINGS_MAX_HEADER_LIST_SIZE: usize = 16 << 20; + +#[derive(Debug)] +pub struct FramedRead<T> { + inner: InnerFramedRead<T, LengthDelimitedCodec>, + + // hpack decoder state + hpack: hpack::Decoder, + + max_header_list_size: usize, + + partial: Option<Partial>, +} + +/// Partially loaded headers frame +#[derive(Debug)] +struct Partial { + /// Empty frame + frame: Continuable, + + /// Partial header payload + buf: BytesMut, +} + +#[derive(Debug)] +enum Continuable { + Headers(frame::Headers), + PushPromise(frame::PushPromise), +} + +impl<T> FramedRead<T> { + pub fn new(inner: InnerFramedRead<T, LengthDelimitedCodec>) -> FramedRead<T> { + FramedRead { + inner, + hpack: hpack::Decoder::new(DEFAULT_SETTINGS_HEADER_TABLE_SIZE), + max_header_list_size: DEFAULT_SETTINGS_MAX_HEADER_LIST_SIZE, + partial: None, + } + } + + pub fn get_ref(&self) -> &T { + self.inner.get_ref() + } + + pub fn get_mut(&mut self) -> &mut T { + self.inner.get_mut() + } + + /// Returns the current max frame size setting + #[cfg(feature = "unstable")] + #[inline] + pub fn max_frame_size(&self) -> usize { + self.inner.decoder().max_frame_length() + } + + /// Updates the max frame size setting. + /// + /// Must be within 16,384 and 16,777,215. + #[inline] + pub fn set_max_frame_size(&mut self, val: usize) { + assert!(DEFAULT_MAX_FRAME_SIZE as usize <= val && val <= MAX_MAX_FRAME_SIZE as usize); + self.inner.decoder_mut().set_max_frame_length(val) + } + + /// Update the max header list size setting. + #[inline] + pub fn set_max_header_list_size(&mut self, val: usize) { + self.max_header_list_size = val; + } +} + +/// Decodes a frame. +/// +/// This method is intentionally de-generified and outlined because it is very large. +fn decode_frame( + hpack: &mut hpack::Decoder, + max_header_list_size: usize, + partial_inout: &mut Option<Partial>, + mut bytes: BytesMut, +) -> Result<Option<Frame>, Error> { + let span = tracing::trace_span!("FramedRead::decode_frame", offset = bytes.len()); + let _e = span.enter(); + + tracing::trace!("decoding frame from {}B", bytes.len()); + + // Parse the head + let head = frame::Head::parse(&bytes); + + if partial_inout.is_some() && head.kind() != Kind::Continuation { + proto_err!(conn: "expected CONTINUATION, got {:?}", head.kind()); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR).into()); + } + + let kind = head.kind(); + + tracing::trace!(frame.kind = ?kind); + + macro_rules! header_block { + ($frame:ident, $head:ident, $bytes:ident) => ({ + // Drop the frame header + // TODO: Change to drain: carllerche/bytes#130 + let _ = $bytes.split_to(frame::HEADER_LEN); + + // Parse the header frame w/o parsing the payload + let (mut frame, mut payload) = match frame::$frame::load($head, $bytes) { + Ok(res) => res, + Err(frame::Error::InvalidDependencyId) => { + proto_err!(stream: "invalid HEADERS dependency ID"); + // A stream cannot depend on itself. An endpoint MUST + // treat this as a stream error (Section 5.4.2) of type + // `PROTOCOL_ERROR`. + return Err(Error::library_reset($head.stream_id(), Reason::PROTOCOL_ERROR)); + }, + Err(e) => { + proto_err!(conn: "failed to load frame; err={:?}", e); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + }; + + let is_end_headers = frame.is_end_headers(); + + // Load the HPACK encoded headers + match frame.load_hpack(&mut payload, max_header_list_size, hpack) { + Ok(_) => {}, + Err(frame::Error::Hpack(hpack::DecoderError::NeedMore(_))) if !is_end_headers => {}, + Err(frame::Error::MalformedMessage) => { + let id = $head.stream_id(); + proto_err!(stream: "malformed header block; stream={:?}", id); + return Err(Error::library_reset(id, Reason::PROTOCOL_ERROR)); + }, + Err(e) => { + proto_err!(conn: "failed HPACK decoding; err={:?}", e); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + } + + if is_end_headers { + frame.into() + } else { + tracing::trace!("loaded partial header block"); + // Defer returning the frame + *partial_inout = Some(Partial { + frame: Continuable::$frame(frame), + buf: payload, + }); + + return Ok(None); + } + }); + } + + let frame = match kind { + Kind::Settings => { + let res = frame::Settings::load(head, &bytes[frame::HEADER_LEN..]); + + res.map_err(|e| { + proto_err!(conn: "failed to load SETTINGS frame; err={:?}", e); + Error::library_go_away(Reason::PROTOCOL_ERROR) + })? + .into() + } + Kind::Ping => { + let res = frame::Ping::load(head, &bytes[frame::HEADER_LEN..]); + + res.map_err(|e| { + proto_err!(conn: "failed to load PING frame; err={:?}", e); + Error::library_go_away(Reason::PROTOCOL_ERROR) + })? + .into() + } + Kind::WindowUpdate => { + let res = frame::WindowUpdate::load(head, &bytes[frame::HEADER_LEN..]); + + res.map_err(|e| { + proto_err!(conn: "failed to load WINDOW_UPDATE frame; err={:?}", e); + Error::library_go_away(Reason::PROTOCOL_ERROR) + })? + .into() + } + Kind::Data => { + let _ = bytes.split_to(frame::HEADER_LEN); + let res = frame::Data::load(head, bytes.freeze()); + + // TODO: Should this always be connection level? Probably not... + res.map_err(|e| { + proto_err!(conn: "failed to load DATA frame; err={:?}", e); + Error::library_go_away(Reason::PROTOCOL_ERROR) + })? + .into() + } + Kind::Headers => header_block!(Headers, head, bytes), + Kind::Reset => { + let res = frame::Reset::load(head, &bytes[frame::HEADER_LEN..]); + res.map_err(|e| { + proto_err!(conn: "failed to load RESET frame; err={:?}", e); + Error::library_go_away(Reason::PROTOCOL_ERROR) + })? + .into() + } + Kind::GoAway => { + let res = frame::GoAway::load(&bytes[frame::HEADER_LEN..]); + res.map_err(|e| { + proto_err!(conn: "failed to load GO_AWAY frame; err={:?}", e); + Error::library_go_away(Reason::PROTOCOL_ERROR) + })? + .into() + } + Kind::PushPromise => header_block!(PushPromise, head, bytes), + Kind::Priority => { + if head.stream_id() == 0 { + // Invalid stream identifier + proto_err!(conn: "invalid stream ID 0"); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR).into()); + } + + match frame::Priority::load(head, &bytes[frame::HEADER_LEN..]) { + Ok(frame) => frame.into(), + Err(frame::Error::InvalidDependencyId) => { + // A stream cannot depend on itself. An endpoint MUST + // treat this as a stream error (Section 5.4.2) of type + // `PROTOCOL_ERROR`. + let id = head.stream_id(); + proto_err!(stream: "PRIORITY invalid dependency ID; stream={:?}", id); + return Err(Error::library_reset(id, Reason::PROTOCOL_ERROR)); + } + Err(e) => { + proto_err!(conn: "failed to load PRIORITY frame; err={:?};", e); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + } + } + Kind::Continuation => { + let is_end_headers = (head.flag() & 0x4) == 0x4; + + let mut partial = match partial_inout.take() { + Some(partial) => partial, + None => { + proto_err!(conn: "received unexpected CONTINUATION frame"); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR).into()); + } + }; + + // The stream identifiers must match + if partial.frame.stream_id() != head.stream_id() { + proto_err!(conn: "CONTINUATION frame stream ID does not match previous frame stream ID"); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR).into()); + } + + // Extend the buf + if partial.buf.is_empty() { + partial.buf = bytes.split_off(frame::HEADER_LEN); + } else { + if partial.frame.is_over_size() { + // If there was left over bytes previously, they may be + // needed to continue decoding, even though we will + // be ignoring this frame. This is done to keep the HPACK + // decoder state up-to-date. + // + // Still, we need to be careful, because if a malicious + // attacker were to try to send a gigantic string, such + // that it fits over multiple header blocks, we could + // grow memory uncontrollably again, and that'd be a shame. + // + // Instead, we use a simple heuristic to determine if + // we should continue to ignore decoding, or to tell + // the attacker to go away. + if partial.buf.len() + bytes.len() > max_header_list_size { + proto_err!(conn: "CONTINUATION frame header block size over ignorable limit"); + return Err(Error::library_go_away(Reason::COMPRESSION_ERROR).into()); + } + } + partial.buf.extend_from_slice(&bytes[frame::HEADER_LEN..]); + } + + match partial + .frame + .load_hpack(&mut partial.buf, max_header_list_size, hpack) + { + Ok(_) => {} + Err(frame::Error::Hpack(hpack::DecoderError::NeedMore(_))) if !is_end_headers => {} + Err(frame::Error::MalformedMessage) => { + let id = head.stream_id(); + proto_err!(stream: "malformed CONTINUATION frame; stream={:?}", id); + return Err(Error::library_reset(id, Reason::PROTOCOL_ERROR)); + } + Err(e) => { + proto_err!(conn: "failed HPACK decoding; err={:?}", e); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + } + + if is_end_headers { + partial.frame.into() + } else { + *partial_inout = Some(partial); + return Ok(None); + } + } + Kind::Unknown => { + // Unknown frames are ignored + return Ok(None); + } + }; + + Ok(Some(frame)) +} + +impl<T> Stream for FramedRead<T> +where + T: AsyncRead + Unpin, +{ + type Item = Result<Frame, Error>; + + fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> { + let span = tracing::trace_span!("FramedRead::poll_next"); + let _e = span.enter(); + loop { + tracing::trace!("poll"); + let bytes = match ready!(Pin::new(&mut self.inner).poll_next(cx)) { + Some(Ok(bytes)) => bytes, + Some(Err(e)) => return Poll::Ready(Some(Err(map_err(e)))), + None => return Poll::Ready(None), + }; + + tracing::trace!(read.bytes = bytes.len()); + let Self { + ref mut hpack, + max_header_list_size, + ref mut partial, + .. + } = *self; + if let Some(frame) = decode_frame(hpack, max_header_list_size, partial, bytes)? { + tracing::debug!(?frame, "received"); + return Poll::Ready(Some(Ok(frame))); + } + } + } +} + +fn map_err(err: io::Error) -> Error { + if let io::ErrorKind::InvalidData = err.kind() { + if let Some(custom) = err.get_ref() { + if custom.is::<LengthDelimitedCodecError>() { + return Error::library_go_away(Reason::FRAME_SIZE_ERROR); + } + } + } + err.into() +} + +// ===== impl Continuable ===== + +impl Continuable { + fn stream_id(&self) -> frame::StreamId { + match *self { + Continuable::Headers(ref h) => h.stream_id(), + Continuable::PushPromise(ref p) => p.stream_id(), + } + } + + fn is_over_size(&self) -> bool { + match *self { + Continuable::Headers(ref h) => h.is_over_size(), + Continuable::PushPromise(ref p) => p.is_over_size(), + } + } + + fn load_hpack( + &mut self, + src: &mut BytesMut, + max_header_list_size: usize, + decoder: &mut hpack::Decoder, + ) -> Result<(), frame::Error> { + match *self { + Continuable::Headers(ref mut h) => h.load_hpack(src, max_header_list_size, decoder), + Continuable::PushPromise(ref mut p) => p.load_hpack(src, max_header_list_size, decoder), + } + } +} + +impl<T> From<Continuable> for Frame<T> { + fn from(cont: Continuable) -> Self { + match cont { + Continuable::Headers(mut headers) => { + headers.set_end_headers(); + headers.into() + } + Continuable::PushPromise(mut push) => { + push.set_end_headers(); + push.into() + } + } + } +} diff --git a/third_party/rust/h2/src/codec/framed_write.rs b/third_party/rust/h2/src/codec/framed_write.rs new file mode 100644 index 0000000000..4b1b4accc4 --- /dev/null +++ b/third_party/rust/h2/src/codec/framed_write.rs @@ -0,0 +1,374 @@ +use crate::codec::UserError; +use crate::codec::UserError::*; +use crate::frame::{self, Frame, FrameSize}; +use crate::hpack; + +use bytes::{Buf, BufMut, BytesMut}; +use std::pin::Pin; +use std::task::{Context, Poll}; +use tokio::io::{AsyncRead, AsyncWrite, ReadBuf}; + +use std::io::{self, Cursor, IoSlice}; + +// A macro to get around a method needing to borrow &mut self +macro_rules! limited_write_buf { + ($self:expr) => {{ + let limit = $self.max_frame_size() + frame::HEADER_LEN; + $self.buf.get_mut().limit(limit) + }}; +} + +#[derive(Debug)] +pub struct FramedWrite<T, B> { + /// Upstream `AsyncWrite` + inner: T, + + encoder: Encoder<B>, +} + +#[derive(Debug)] +struct Encoder<B> { + /// HPACK encoder + hpack: hpack::Encoder, + + /// Write buffer + /// + /// TODO: Should this be a ring buffer? + buf: Cursor<BytesMut>, + + /// Next frame to encode + next: Option<Next<B>>, + + /// Last data frame + last_data_frame: Option<frame::Data<B>>, + + /// Max frame size, this is specified by the peer + max_frame_size: FrameSize, + + /// Whether or not the wrapped `AsyncWrite` supports vectored IO. + is_write_vectored: bool, +} + +#[derive(Debug)] +enum Next<B> { + Data(frame::Data<B>), + Continuation(frame::Continuation), +} + +/// Initialize the connection with this amount of write buffer. +/// +/// The minimum MAX_FRAME_SIZE is 16kb, so always be able to send a HEADERS +/// frame that big. +const DEFAULT_BUFFER_CAPACITY: usize = 16 * 1_024; + +/// Min buffer required to attempt to write a frame +const MIN_BUFFER_CAPACITY: usize = frame::HEADER_LEN + CHAIN_THRESHOLD; + +/// Chain payloads bigger than this. The remote will never advertise a max frame +/// size less than this (well, the spec says the max frame size can't be less +/// than 16kb, so not even close). +const CHAIN_THRESHOLD: usize = 256; + +// TODO: Make generic +impl<T, B> FramedWrite<T, B> +where + T: AsyncWrite + Unpin, + B: Buf, +{ + pub fn new(inner: T) -> FramedWrite<T, B> { + let is_write_vectored = inner.is_write_vectored(); + FramedWrite { + inner, + encoder: Encoder { + hpack: hpack::Encoder::default(), + buf: Cursor::new(BytesMut::with_capacity(DEFAULT_BUFFER_CAPACITY)), + next: None, + last_data_frame: None, + max_frame_size: frame::DEFAULT_MAX_FRAME_SIZE, + is_write_vectored, + }, + } + } + + /// Returns `Ready` when `send` is able to accept a frame + /// + /// Calling this function may result in the current contents of the buffer + /// to be flushed to `T`. + pub fn poll_ready(&mut self, cx: &mut Context) -> Poll<io::Result<()>> { + if !self.encoder.has_capacity() { + // Try flushing + ready!(self.flush(cx))?; + + if !self.encoder.has_capacity() { + return Poll::Pending; + } + } + + Poll::Ready(Ok(())) + } + + /// Buffer a frame. + /// + /// `poll_ready` must be called first to ensure that a frame may be + /// accepted. + pub fn buffer(&mut self, item: Frame<B>) -> Result<(), UserError> { + self.encoder.buffer(item) + } + + /// Flush buffered data to the wire + pub fn flush(&mut self, cx: &mut Context) -> Poll<io::Result<()>> { + let span = tracing::trace_span!("FramedWrite::flush"); + let _e = span.enter(); + + loop { + while !self.encoder.is_empty() { + match self.encoder.next { + Some(Next::Data(ref mut frame)) => { + tracing::trace!(queued_data_frame = true); + let mut buf = (&mut self.encoder.buf).chain(frame.payload_mut()); + ready!(write( + &mut self.inner, + self.encoder.is_write_vectored, + &mut buf, + cx, + ))? + } + _ => { + tracing::trace!(queued_data_frame = false); + ready!(write( + &mut self.inner, + self.encoder.is_write_vectored, + &mut self.encoder.buf, + cx, + ))? + } + } + } + + match self.encoder.unset_frame() { + ControlFlow::Continue => (), + ControlFlow::Break => break, + } + } + + tracing::trace!("flushing buffer"); + // Flush the upstream + ready!(Pin::new(&mut self.inner).poll_flush(cx))?; + + Poll::Ready(Ok(())) + } + + /// Close the codec + pub fn shutdown(&mut self, cx: &mut Context) -> Poll<io::Result<()>> { + ready!(self.flush(cx))?; + Pin::new(&mut self.inner).poll_shutdown(cx) + } +} + +fn write<T, B>( + writer: &mut T, + is_write_vectored: bool, + buf: &mut B, + cx: &mut Context<'_>, +) -> Poll<io::Result<()>> +where + T: AsyncWrite + Unpin, + B: Buf, +{ + // TODO(eliza): when tokio-util 0.5.1 is released, this + // could just use `poll_write_buf`... + const MAX_IOVS: usize = 64; + let n = if is_write_vectored { + let mut bufs = [IoSlice::new(&[]); MAX_IOVS]; + let cnt = buf.chunks_vectored(&mut bufs); + ready!(Pin::new(writer).poll_write_vectored(cx, &bufs[..cnt]))? + } else { + ready!(Pin::new(writer).poll_write(cx, buf.chunk()))? + }; + buf.advance(n); + Ok(()).into() +} + +#[must_use] +enum ControlFlow { + Continue, + Break, +} + +impl<B> Encoder<B> +where + B: Buf, +{ + fn unset_frame(&mut self) -> ControlFlow { + // Clear internal buffer + self.buf.set_position(0); + self.buf.get_mut().clear(); + + // The data frame has been written, so unset it + match self.next.take() { + Some(Next::Data(frame)) => { + self.last_data_frame = Some(frame); + debug_assert!(self.is_empty()); + ControlFlow::Break + } + Some(Next::Continuation(frame)) => { + // Buffer the continuation frame, then try to write again + let mut buf = limited_write_buf!(self); + if let Some(continuation) = frame.encode(&mut buf) { + self.next = Some(Next::Continuation(continuation)); + } + ControlFlow::Continue + } + None => ControlFlow::Break, + } + } + + fn buffer(&mut self, item: Frame<B>) -> Result<(), UserError> { + // Ensure that we have enough capacity to accept the write. + assert!(self.has_capacity()); + let span = tracing::trace_span!("FramedWrite::buffer", frame = ?item); + let _e = span.enter(); + + tracing::debug!(frame = ?item, "send"); + + match item { + Frame::Data(mut v) => { + // Ensure that the payload is not greater than the max frame. + let len = v.payload().remaining(); + + if len > self.max_frame_size() { + return Err(PayloadTooBig); + } + + if len >= CHAIN_THRESHOLD { + let head = v.head(); + + // Encode the frame head to the buffer + head.encode(len, self.buf.get_mut()); + + // Save the data frame + self.next = Some(Next::Data(v)); + } else { + v.encode_chunk(self.buf.get_mut()); + + // The chunk has been fully encoded, so there is no need to + // keep it around + assert_eq!(v.payload().remaining(), 0, "chunk not fully encoded"); + + // Save off the last frame... + self.last_data_frame = Some(v); + } + } + Frame::Headers(v) => { + let mut buf = limited_write_buf!(self); + if let Some(continuation) = v.encode(&mut self.hpack, &mut buf) { + self.next = Some(Next::Continuation(continuation)); + } + } + Frame::PushPromise(v) => { + let mut buf = limited_write_buf!(self); + if let Some(continuation) = v.encode(&mut self.hpack, &mut buf) { + self.next = Some(Next::Continuation(continuation)); + } + } + Frame::Settings(v) => { + v.encode(self.buf.get_mut()); + tracing::trace!(rem = self.buf.remaining(), "encoded settings"); + } + Frame::GoAway(v) => { + v.encode(self.buf.get_mut()); + tracing::trace!(rem = self.buf.remaining(), "encoded go_away"); + } + Frame::Ping(v) => { + v.encode(self.buf.get_mut()); + tracing::trace!(rem = self.buf.remaining(), "encoded ping"); + } + Frame::WindowUpdate(v) => { + v.encode(self.buf.get_mut()); + tracing::trace!(rem = self.buf.remaining(), "encoded window_update"); + } + + Frame::Priority(_) => { + /* + v.encode(self.buf.get_mut()); + tracing::trace!("encoded priority; rem={:?}", self.buf.remaining()); + */ + unimplemented!(); + } + Frame::Reset(v) => { + v.encode(self.buf.get_mut()); + tracing::trace!(rem = self.buf.remaining(), "encoded reset"); + } + } + + Ok(()) + } + + fn has_capacity(&self) -> bool { + self.next.is_none() && self.buf.get_ref().remaining_mut() >= MIN_BUFFER_CAPACITY + } + + fn is_empty(&self) -> bool { + match self.next { + Some(Next::Data(ref frame)) => !frame.payload().has_remaining(), + _ => !self.buf.has_remaining(), + } + } +} + +impl<B> Encoder<B> { + fn max_frame_size(&self) -> usize { + self.max_frame_size as usize + } +} + +impl<T, B> FramedWrite<T, B> { + /// Returns the max frame size that can be sent + pub fn max_frame_size(&self) -> usize { + self.encoder.max_frame_size() + } + + /// Set the peer's max frame size. + pub fn set_max_frame_size(&mut self, val: usize) { + assert!(val <= frame::MAX_MAX_FRAME_SIZE as usize); + self.encoder.max_frame_size = val as FrameSize; + } + + /// Set the peer's header table size. + pub fn set_header_table_size(&mut self, val: usize) { + self.encoder.hpack.update_max_size(val); + } + + /// Retrieve the last data frame that has been sent + pub fn take_last_data_frame(&mut self) -> Option<frame::Data<B>> { + self.encoder.last_data_frame.take() + } + + pub fn get_mut(&mut self) -> &mut T { + &mut self.inner + } +} + +impl<T: AsyncRead + Unpin, B> AsyncRead for FramedWrite<T, B> { + fn poll_read( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf, + ) -> Poll<io::Result<()>> { + Pin::new(&mut self.inner).poll_read(cx, buf) + } +} + +// We never project the Pin to `B`. +impl<T: Unpin, B> Unpin for FramedWrite<T, B> {} + +#[cfg(feature = "unstable")] +mod unstable { + use super::*; + + impl<T, B> FramedWrite<T, B> { + pub fn get_ref(&self) -> &T { + &self.inner + } + } +} diff --git a/third_party/rust/h2/src/codec/mod.rs b/third_party/rust/h2/src/codec/mod.rs new file mode 100644 index 0000000000..359adf6e47 --- /dev/null +++ b/third_party/rust/h2/src/codec/mod.rs @@ -0,0 +1,201 @@ +mod error; +mod framed_read; +mod framed_write; + +pub use self::error::{SendError, UserError}; + +use self::framed_read::FramedRead; +use self::framed_write::FramedWrite; + +use crate::frame::{self, Data, Frame}; +use crate::proto::Error; + +use bytes::Buf; +use futures_core::Stream; +use futures_sink::Sink; +use std::pin::Pin; +use std::task::{Context, Poll}; +use tokio::io::{AsyncRead, AsyncWrite}; +use tokio_util::codec::length_delimited; + +use std::io; + +#[derive(Debug)] +pub struct Codec<T, B> { + inner: FramedRead<FramedWrite<T, B>>, +} + +impl<T, B> Codec<T, B> +where + T: AsyncRead + AsyncWrite + Unpin, + B: Buf, +{ + /// Returns a new `Codec` with the default max frame size + #[inline] + pub fn new(io: T) -> Self { + Self::with_max_recv_frame_size(io, frame::DEFAULT_MAX_FRAME_SIZE as usize) + } + + /// Returns a new `Codec` with the given maximum frame size + pub fn with_max_recv_frame_size(io: T, max_frame_size: usize) -> Self { + // Wrap with writer + let framed_write = FramedWrite::new(io); + + // Delimit the frames + let delimited = length_delimited::Builder::new() + .big_endian() + .length_field_length(3) + .length_adjustment(9) + .num_skip(0) // Don't skip the header + .new_read(framed_write); + + let mut inner = FramedRead::new(delimited); + + // Use FramedRead's method since it checks the value is within range. + inner.set_max_frame_size(max_frame_size); + + Codec { inner } + } +} + +impl<T, B> Codec<T, B> { + /// Updates the max received frame size. + /// + /// The change takes effect the next time a frame is decoded. In other + /// words, if a frame is currently in process of being decoded with a frame + /// size greater than `val` but less than the max frame size in effect + /// before calling this function, then the frame will be allowed. + #[inline] + pub fn set_max_recv_frame_size(&mut self, val: usize) { + self.inner.set_max_frame_size(val) + } + + /// Returns the current max received frame size setting. + /// + /// This is the largest size this codec will accept from the wire. Larger + /// frames will be rejected. + #[cfg(feature = "unstable")] + #[inline] + pub fn max_recv_frame_size(&self) -> usize { + self.inner.max_frame_size() + } + + /// Returns the max frame size that can be sent to the peer. + pub fn max_send_frame_size(&self) -> usize { + self.inner.get_ref().max_frame_size() + } + + /// Set the peer's max frame size. + pub fn set_max_send_frame_size(&mut self, val: usize) { + self.framed_write().set_max_frame_size(val) + } + + /// Set the peer's header table size size. + pub fn set_send_header_table_size(&mut self, val: usize) { + self.framed_write().set_header_table_size(val) + } + + /// Set the max header list size that can be received. + pub fn set_max_recv_header_list_size(&mut self, val: usize) { + self.inner.set_max_header_list_size(val); + } + + /// Get a reference to the inner stream. + #[cfg(feature = "unstable")] + pub fn get_ref(&self) -> &T { + self.inner.get_ref().get_ref() + } + + /// Get a mutable reference to the inner stream. + pub fn get_mut(&mut self) -> &mut T { + self.inner.get_mut().get_mut() + } + + /// Takes the data payload value that was fully written to the socket + pub(crate) fn take_last_data_frame(&mut self) -> Option<Data<B>> { + self.framed_write().take_last_data_frame() + } + + fn framed_write(&mut self) -> &mut FramedWrite<T, B> { + self.inner.get_mut() + } +} + +impl<T, B> Codec<T, B> +where + T: AsyncWrite + Unpin, + B: Buf, +{ + /// Returns `Ready` when the codec can buffer a frame + pub fn poll_ready(&mut self, cx: &mut Context) -> Poll<io::Result<()>> { + self.framed_write().poll_ready(cx) + } + + /// Buffer a frame. + /// + /// `poll_ready` must be called first to ensure that a frame may be + /// accepted. + /// + /// TODO: Rename this to avoid conflicts with Sink::buffer + pub fn buffer(&mut self, item: Frame<B>) -> Result<(), UserError> { + self.framed_write().buffer(item) + } + + /// Flush buffered data to the wire + pub fn flush(&mut self, cx: &mut Context) -> Poll<io::Result<()>> { + self.framed_write().flush(cx) + } + + /// Shutdown the send half + pub fn shutdown(&mut self, cx: &mut Context) -> Poll<io::Result<()>> { + self.framed_write().shutdown(cx) + } +} + +impl<T, B> Stream for Codec<T, B> +where + T: AsyncRead + Unpin, +{ + type Item = Result<Frame, Error>; + + fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> { + Pin::new(&mut self.inner).poll_next(cx) + } +} + +impl<T, B> Sink<Frame<B>> for Codec<T, B> +where + T: AsyncWrite + Unpin, + B: Buf, +{ + type Error = SendError; + + fn start_send(mut self: Pin<&mut Self>, item: Frame<B>) -> Result<(), Self::Error> { + Codec::buffer(&mut self, item)?; + Ok(()) + } + /// Returns `Ready` when the codec can buffer a frame + fn poll_ready(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { + self.framed_write().poll_ready(cx).map_err(Into::into) + } + + /// Flush buffered data to the wire + fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { + self.framed_write().flush(cx).map_err(Into::into) + } + + fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { + ready!(self.shutdown(cx))?; + Poll::Ready(Ok(())) + } +} + +// TODO: remove (or improve) this +impl<T> From<T> for Codec<T, bytes::Bytes> +where + T: AsyncRead + AsyncWrite + Unpin, +{ + fn from(src: T) -> Self { + Self::new(src) + } +} diff --git a/third_party/rust/h2/src/error.rs b/third_party/rust/h2/src/error.rs new file mode 100644 index 0000000000..d45827e36f --- /dev/null +++ b/third_party/rust/h2/src/error.rs @@ -0,0 +1,200 @@ +use crate::codec::{SendError, UserError}; +use crate::frame::StreamId; +use crate::proto::{self, Initiator}; + +use bytes::Bytes; +use std::{error, fmt, io}; + +pub use crate::frame::Reason; + +/// Represents HTTP/2 operation errors. +/// +/// `Error` covers error cases raised by protocol errors caused by the +/// peer, I/O (transport) errors, and errors caused by the user of the library. +/// +/// If the error was caused by the remote peer, then it will contain a +/// [`Reason`] which can be obtained with the [`reason`] function. +/// +/// [`Reason`]: struct.Reason.html +/// [`reason`]: #method.reason +#[derive(Debug)] +pub struct Error { + kind: Kind, +} + +#[derive(Debug)] +enum Kind { + /// A RST_STREAM frame was received or sent. + Reset(StreamId, Reason, Initiator), + + /// A GO_AWAY frame was received or sent. + GoAway(Bytes, Reason, Initiator), + + /// The user created an error from a bare Reason. + Reason(Reason), + + /// An error resulting from an invalid action taken by the user of this + /// library. + User(UserError), + + /// An `io::Error` occurred while trying to read or write. + Io(io::Error), +} + +// ===== impl Error ===== + +impl Error { + /// If the error was caused by the remote peer, the error reason. + /// + /// This is either an error received by the peer or caused by an invalid + /// action taken by the peer (i.e. a protocol error). + pub fn reason(&self) -> Option<Reason> { + match self.kind { + Kind::Reset(_, reason, _) | Kind::GoAway(_, reason, _) | Kind::Reason(reason) => { + Some(reason) + } + _ => None, + } + } + + /// Returns true if the error is an io::Error + pub fn is_io(&self) -> bool { + matches!(self.kind, Kind::Io(..)) + } + + /// Returns the error if the error is an io::Error + pub fn get_io(&self) -> Option<&io::Error> { + match self.kind { + Kind::Io(ref e) => Some(e), + _ => None, + } + } + + /// Returns the error if the error is an io::Error + pub fn into_io(self) -> Option<io::Error> { + match self.kind { + Kind::Io(e) => Some(e), + _ => None, + } + } + + pub(crate) fn from_io(err: io::Error) -> Self { + Error { + kind: Kind::Io(err), + } + } + + /// Returns true if the error is from a `GOAWAY`. + pub fn is_go_away(&self) -> bool { + matches!(self.kind, Kind::GoAway(..)) + } + + /// Returns true if the error is from a `RST_STREAM`. + pub fn is_reset(&self) -> bool { + matches!(self.kind, Kind::Reset(..)) + } + + /// Returns true if the error was received in a frame from the remote. + /// + /// Such as from a received `RST_STREAM` or `GOAWAY` frame. + pub fn is_remote(&self) -> bool { + matches!( + self.kind, + Kind::GoAway(_, _, Initiator::Remote) | Kind::Reset(_, _, Initiator::Remote) + ) + } +} + +impl From<proto::Error> for Error { + fn from(src: proto::Error) -> Error { + use crate::proto::Error::*; + + Error { + kind: match src { + Reset(stream_id, reason, initiator) => Kind::Reset(stream_id, reason, initiator), + GoAway(debug_data, reason, initiator) => { + Kind::GoAway(debug_data, reason, initiator) + } + Io(kind, inner) => { + Kind::Io(inner.map_or_else(|| kind.into(), |inner| io::Error::new(kind, inner))) + } + }, + } + } +} + +impl From<Reason> for Error { + fn from(src: Reason) -> Error { + Error { + kind: Kind::Reason(src), + } + } +} + +impl From<SendError> for Error { + fn from(src: SendError) -> Error { + match src { + SendError::User(e) => e.into(), + SendError::Connection(e) => e.into(), + } + } +} + +impl From<UserError> for Error { + fn from(src: UserError) -> Error { + Error { + kind: Kind::User(src), + } + } +} + +impl fmt::Display for Error { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + let debug_data = match self.kind { + Kind::Reset(_, reason, Initiator::User) => { + return write!(fmt, "stream error sent by user: {}", reason) + } + Kind::Reset(_, reason, Initiator::Library) => { + return write!(fmt, "stream error detected: {}", reason) + } + Kind::Reset(_, reason, Initiator::Remote) => { + return write!(fmt, "stream error received: {}", reason) + } + Kind::GoAway(ref debug_data, reason, Initiator::User) => { + write!(fmt, "connection error sent by user: {}", reason)?; + debug_data + } + Kind::GoAway(ref debug_data, reason, Initiator::Library) => { + write!(fmt, "connection error detected: {}", reason)?; + debug_data + } + Kind::GoAway(ref debug_data, reason, Initiator::Remote) => { + write!(fmt, "connection error received: {}", reason)?; + debug_data + } + Kind::Reason(reason) => return write!(fmt, "protocol error: {}", reason), + Kind::User(ref e) => return write!(fmt, "user error: {}", e), + Kind::Io(ref e) => return e.fmt(fmt), + }; + + if !debug_data.is_empty() { + write!(fmt, " ({:?})", debug_data)?; + } + + Ok(()) + } +} + +impl error::Error for Error {} + +#[cfg(test)] +mod tests { + use super::Error; + use crate::Reason; + + #[test] + fn error_from_reason() { + let err = Error::from(Reason::HTTP_1_1_REQUIRED); + assert_eq!(err.reason(), Some(Reason::HTTP_1_1_REQUIRED)); + } +} diff --git a/third_party/rust/h2/src/ext.rs b/third_party/rust/h2/src/ext.rs new file mode 100644 index 0000000000..cf383a4950 --- /dev/null +++ b/third_party/rust/h2/src/ext.rs @@ -0,0 +1,55 @@ +//! Extensions specific to the HTTP/2 protocol. + +use crate::hpack::BytesStr; + +use bytes::Bytes; +use std::fmt; + +/// Represents the `:protocol` pseudo-header used by +/// the [Extended CONNECT Protocol]. +/// +/// [Extended CONNECT Protocol]: https://datatracker.ietf.org/doc/html/rfc8441#section-4 +#[derive(Clone, Eq, PartialEq)] +pub struct Protocol { + value: BytesStr, +} + +impl Protocol { + /// Converts a static string to a protocol name. + pub const fn from_static(value: &'static str) -> Self { + Self { + value: BytesStr::from_static(value), + } + } + + /// Returns a str representation of the header. + pub fn as_str(&self) -> &str { + self.value.as_str() + } + + pub(crate) fn try_from(bytes: Bytes) -> Result<Self, std::str::Utf8Error> { + Ok(Self { + value: BytesStr::try_from(bytes)?, + }) + } +} + +impl<'a> From<&'a str> for Protocol { + fn from(value: &'a str) -> Self { + Self { + value: BytesStr::from(value), + } + } +} + +impl AsRef<[u8]> for Protocol { + fn as_ref(&self) -> &[u8] { + self.value.as_ref() + } +} + +impl fmt::Debug for Protocol { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + self.value.fmt(f) + } +} diff --git a/third_party/rust/h2/src/frame/data.rs b/third_party/rust/h2/src/frame/data.rs new file mode 100644 index 0000000000..e253d5e23d --- /dev/null +++ b/third_party/rust/h2/src/frame/data.rs @@ -0,0 +1,233 @@ +use crate::frame::{util, Error, Frame, Head, Kind, StreamId}; +use bytes::{Buf, BufMut, Bytes}; + +use std::fmt; + +/// Data frame +/// +/// Data frames convey arbitrary, variable-length sequences of octets associated +/// with a stream. One or more DATA frames are used, for instance, to carry HTTP +/// request or response payloads. +#[derive(Eq, PartialEq)] +pub struct Data<T = Bytes> { + stream_id: StreamId, + data: T, + flags: DataFlags, + pad_len: Option<u8>, +} + +#[derive(Copy, Clone, Eq, PartialEq)] +struct DataFlags(u8); + +const END_STREAM: u8 = 0x1; +const PADDED: u8 = 0x8; +const ALL: u8 = END_STREAM | PADDED; + +impl<T> Data<T> { + /// Creates a new DATA frame. + pub fn new(stream_id: StreamId, payload: T) -> Self { + assert!(!stream_id.is_zero()); + + Data { + stream_id, + data: payload, + flags: DataFlags::default(), + pad_len: None, + } + } + + /// Returns the stream identifier that this frame is associated with. + /// + /// This cannot be a zero stream identifier. + pub fn stream_id(&self) -> StreamId { + self.stream_id + } + + /// Gets the value of the `END_STREAM` flag for this frame. + /// + /// If true, this frame is the last that the endpoint will send for the + /// identified stream. + /// + /// Setting this flag causes the stream to enter one of the "half-closed" + /// states or the "closed" state (Section 5.1). + pub fn is_end_stream(&self) -> bool { + self.flags.is_end_stream() + } + + /// Sets the value for the `END_STREAM` flag on this frame. + pub fn set_end_stream(&mut self, val: bool) { + if val { + self.flags.set_end_stream(); + } else { + self.flags.unset_end_stream(); + } + } + + /// Returns whether the `PADDED` flag is set on this frame. + #[cfg(feature = "unstable")] + pub fn is_padded(&self) -> bool { + self.flags.is_padded() + } + + /// Sets the value for the `PADDED` flag on this frame. + #[cfg(feature = "unstable")] + pub fn set_padded(&mut self) { + self.flags.set_padded(); + } + + /// Returns a reference to this frame's payload. + /// + /// This does **not** include any padding that might have been originally + /// included. + pub fn payload(&self) -> &T { + &self.data + } + + /// Returns a mutable reference to this frame's payload. + /// + /// This does **not** include any padding that might have been originally + /// included. + pub fn payload_mut(&mut self) -> &mut T { + &mut self.data + } + + /// Consumes `self` and returns the frame's payload. + /// + /// This does **not** include any padding that might have been originally + /// included. + pub fn into_payload(self) -> T { + self.data + } + + pub(crate) fn head(&self) -> Head { + Head::new(Kind::Data, self.flags.into(), self.stream_id) + } + + pub(crate) fn map<F, U>(self, f: F) -> Data<U> + where + F: FnOnce(T) -> U, + { + Data { + stream_id: self.stream_id, + data: f(self.data), + flags: self.flags, + pad_len: self.pad_len, + } + } +} + +impl Data<Bytes> { + pub(crate) fn load(head: Head, mut payload: Bytes) -> Result<Self, Error> { + let flags = DataFlags::load(head.flag()); + + // The stream identifier must not be zero + if head.stream_id().is_zero() { + return Err(Error::InvalidStreamId); + } + + let pad_len = if flags.is_padded() { + let len = util::strip_padding(&mut payload)?; + Some(len) + } else { + None + }; + + Ok(Data { + stream_id: head.stream_id(), + data: payload, + flags, + pad_len, + }) + } +} + +impl<T: Buf> Data<T> { + /// Encode the data frame into the `dst` buffer. + /// + /// # Panics + /// + /// Panics if `dst` cannot contain the data frame. + pub(crate) fn encode_chunk<U: BufMut>(&mut self, dst: &mut U) { + let len = self.data.remaining() as usize; + + assert!(dst.remaining_mut() >= len); + + self.head().encode(len, dst); + dst.put(&mut self.data); + } +} + +impl<T> From<Data<T>> for Frame<T> { + fn from(src: Data<T>) -> Self { + Frame::Data(src) + } +} + +impl<T> fmt::Debug for Data<T> { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + let mut f = fmt.debug_struct("Data"); + f.field("stream_id", &self.stream_id); + if !self.flags.is_empty() { + f.field("flags", &self.flags); + } + if let Some(ref pad_len) = self.pad_len { + f.field("pad_len", pad_len); + } + // `data` bytes purposefully excluded + f.finish() + } +} + +// ===== impl DataFlags ===== + +impl DataFlags { + fn load(bits: u8) -> DataFlags { + DataFlags(bits & ALL) + } + + fn is_empty(&self) -> bool { + self.0 == 0 + } + + fn is_end_stream(&self) -> bool { + self.0 & END_STREAM == END_STREAM + } + + fn set_end_stream(&mut self) { + self.0 |= END_STREAM + } + + fn unset_end_stream(&mut self) { + self.0 &= !END_STREAM + } + + fn is_padded(&self) -> bool { + self.0 & PADDED == PADDED + } + + #[cfg(feature = "unstable")] + fn set_padded(&mut self) { + self.0 |= PADDED + } +} + +impl Default for DataFlags { + fn default() -> Self { + DataFlags(0) + } +} + +impl From<DataFlags> for u8 { + fn from(src: DataFlags) -> u8 { + src.0 + } +} + +impl fmt::Debug for DataFlags { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + util::debug_flags(fmt, self.0) + .flag_if(self.is_end_stream(), "END_STREAM") + .flag_if(self.is_padded(), "PADDED") + .finish() + } +} diff --git a/third_party/rust/h2/src/frame/go_away.rs b/third_party/rust/h2/src/frame/go_away.rs new file mode 100644 index 0000000000..91d9c4c6b5 --- /dev/null +++ b/third_party/rust/h2/src/frame/go_away.rs @@ -0,0 +1,79 @@ +use std::fmt; + +use bytes::{BufMut, Bytes}; + +use crate::frame::{self, Error, Head, Kind, Reason, StreamId}; + +#[derive(Clone, Eq, PartialEq)] +pub struct GoAway { + last_stream_id: StreamId, + error_code: Reason, + #[allow(unused)] + debug_data: Bytes, +} + +impl GoAway { + pub fn new(last_stream_id: StreamId, reason: Reason) -> Self { + GoAway { + last_stream_id, + error_code: reason, + debug_data: Bytes::new(), + } + } + + pub fn last_stream_id(&self) -> StreamId { + self.last_stream_id + } + + pub fn reason(&self) -> Reason { + self.error_code + } + + pub fn debug_data(&self) -> &Bytes { + &self.debug_data + } + + pub fn load(payload: &[u8]) -> Result<GoAway, Error> { + if payload.len() < 8 { + return Err(Error::BadFrameSize); + } + + let (last_stream_id, _) = StreamId::parse(&payload[..4]); + let error_code = unpack_octets_4!(payload, 4, u32); + let debug_data = Bytes::copy_from_slice(&payload[8..]); + + Ok(GoAway { + last_stream_id, + error_code: error_code.into(), + debug_data, + }) + } + + pub fn encode<B: BufMut>(&self, dst: &mut B) { + tracing::trace!("encoding GO_AWAY; code={:?}", self.error_code); + let head = Head::new(Kind::GoAway, 0, StreamId::zero()); + head.encode(8, dst); + dst.put_u32(self.last_stream_id.into()); + dst.put_u32(self.error_code.into()); + } +} + +impl<B> From<GoAway> for frame::Frame<B> { + fn from(src: GoAway) -> Self { + frame::Frame::GoAway(src) + } +} + +impl fmt::Debug for GoAway { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + let mut builder = f.debug_struct("GoAway"); + builder.field("error_code", &self.error_code); + builder.field("last_stream_id", &self.last_stream_id); + + if !self.debug_data.is_empty() { + builder.field("debug_data", &self.debug_data); + } + + builder.finish() + } +} diff --git a/third_party/rust/h2/src/frame/head.rs b/third_party/rust/h2/src/frame/head.rs new file mode 100644 index 0000000000..38be2f6973 --- /dev/null +++ b/third_party/rust/h2/src/frame/head.rs @@ -0,0 +1,94 @@ +use super::StreamId; + +use bytes::BufMut; + +#[derive(Debug, Copy, Clone, PartialEq, Eq)] +pub struct Head { + kind: Kind, + flag: u8, + stream_id: StreamId, +} + +#[repr(u8)] +#[derive(Debug, Copy, Clone, PartialEq, Eq)] +pub enum Kind { + Data = 0, + Headers = 1, + Priority = 2, + Reset = 3, + Settings = 4, + PushPromise = 5, + Ping = 6, + GoAway = 7, + WindowUpdate = 8, + Continuation = 9, + Unknown, +} + +// ===== impl Head ===== + +impl Head { + pub fn new(kind: Kind, flag: u8, stream_id: StreamId) -> Head { + Head { + kind, + flag, + stream_id, + } + } + + /// Parse an HTTP/2 frame header + pub fn parse(header: &[u8]) -> Head { + let (stream_id, _) = StreamId::parse(&header[5..]); + + Head { + kind: Kind::new(header[3]), + flag: header[4], + stream_id, + } + } + + pub fn stream_id(&self) -> StreamId { + self.stream_id + } + + pub fn kind(&self) -> Kind { + self.kind + } + + pub fn flag(&self) -> u8 { + self.flag + } + + pub fn encode_len(&self) -> usize { + super::HEADER_LEN + } + + pub fn encode<T: BufMut>(&self, payload_len: usize, dst: &mut T) { + debug_assert!(self.encode_len() <= dst.remaining_mut()); + + dst.put_uint(payload_len as u64, 3); + dst.put_u8(self.kind as u8); + dst.put_u8(self.flag); + dst.put_u32(self.stream_id.into()); + } +} + +// ===== impl Kind ===== + +impl Kind { + pub fn new(byte: u8) -> Kind { + match byte { + 0 => Kind::Data, + 1 => Kind::Headers, + 2 => Kind::Priority, + 3 => Kind::Reset, + 4 => Kind::Settings, + 5 => Kind::PushPromise, + 6 => Kind::Ping, + 7 => Kind::GoAway, + 8 => Kind::WindowUpdate, + 9 => Kind::Continuation, + _ => Kind::Unknown, + } + } +} diff --git a/third_party/rust/h2/src/frame/headers.rs b/third_party/rust/h2/src/frame/headers.rs new file mode 100644 index 0000000000..bcb9050133 --- /dev/null +++ b/third_party/rust/h2/src/frame/headers.rs @@ -0,0 +1,1039 @@ +use super::{util, StreamDependency, StreamId}; +use crate::ext::Protocol; +use crate::frame::{Error, Frame, Head, Kind}; +use crate::hpack::{self, BytesStr}; + +use http::header::{self, HeaderName, HeaderValue}; +use http::{uri, HeaderMap, Method, Request, StatusCode, Uri}; + +use bytes::{BufMut, Bytes, BytesMut}; + +use std::fmt; +use std::io::Cursor; + +type EncodeBuf<'a> = bytes::buf::Limit<&'a mut BytesMut>; +/// Header frame +/// +/// This could be either a request or a response. +#[derive(Eq, PartialEq)] +pub struct Headers { + /// The ID of the stream with which this frame is associated. + stream_id: StreamId, + + /// The stream dependency information, if any. + stream_dep: Option<StreamDependency>, + + /// The header block fragment + header_block: HeaderBlock, + + /// The associated flags + flags: HeadersFlag, +} + +#[derive(Copy, Clone, Eq, PartialEq)] +pub struct HeadersFlag(u8); + +#[derive(Eq, PartialEq)] +pub struct PushPromise { + /// The ID of the stream with which this frame is associated. + stream_id: StreamId, + + /// The ID of the stream being reserved by this PushPromise. + promised_id: StreamId, + + /// The header block fragment + header_block: HeaderBlock, + + /// The associated flags + flags: PushPromiseFlag, +} + +#[derive(Copy, Clone, Eq, PartialEq)] +pub struct PushPromiseFlag(u8); + +#[derive(Debug)] +pub struct Continuation { + /// Stream ID of continuation frame + stream_id: StreamId, + + header_block: EncodingHeaderBlock, +} + +// TODO: These fields shouldn't be `pub` +#[derive(Debug, Default, Eq, PartialEq)] +pub struct Pseudo { + // Request + pub method: Option<Method>, + pub scheme: Option<BytesStr>, + pub authority: Option<BytesStr>, + pub path: Option<BytesStr>, + pub protocol: Option<Protocol>, + + // Response + pub status: Option<StatusCode>, +} + +#[derive(Debug)] +pub struct Iter { + /// Pseudo headers + pseudo: Option<Pseudo>, + + /// Header fields + fields: header::IntoIter<HeaderValue>, +} + +#[derive(Debug, PartialEq, Eq)] +struct HeaderBlock { + /// The decoded header fields + fields: HeaderMap, + + /// Set to true if decoding went over the max header list size. + is_over_size: bool, + + /// Pseudo headers, these are broken out as they must be sent as part of the + /// headers frame. + pseudo: Pseudo, +} + +#[derive(Debug)] +struct EncodingHeaderBlock { + hpack: Bytes, +} + +const END_STREAM: u8 = 0x1; +const END_HEADERS: u8 = 0x4; +const PADDED: u8 = 0x8; +const PRIORITY: u8 = 0x20; +const ALL: u8 = END_STREAM | END_HEADERS | PADDED | PRIORITY; + +// ===== impl Headers ===== + +impl Headers { + /// Create a new HEADERS frame + pub fn new(stream_id: StreamId, pseudo: Pseudo, fields: HeaderMap) -> Self { + Headers { + stream_id, + stream_dep: None, + header_block: HeaderBlock { + fields, + is_over_size: false, + pseudo, + }, + flags: HeadersFlag::default(), + } + } + + pub fn trailers(stream_id: StreamId, fields: HeaderMap) -> Self { + let mut flags = HeadersFlag::default(); + flags.set_end_stream(); + + Headers { + stream_id, + stream_dep: None, + header_block: HeaderBlock { + fields, + is_over_size: false, + pseudo: Pseudo::default(), + }, + flags, + } + } + + /// Loads the header frame but doesn't actually do HPACK decoding. + /// + /// HPACK decoding is done in the `load_hpack` step. + pub fn load(head: Head, mut src: BytesMut) -> Result<(Self, BytesMut), Error> { + let flags = HeadersFlag(head.flag()); + let mut pad = 0; + + tracing::trace!("loading headers; flags={:?}", flags); + + if head.stream_id().is_zero() { + return Err(Error::InvalidStreamId); + } + + // Read the padding length + if flags.is_padded() { + if src.is_empty() { + return Err(Error::MalformedMessage); + } + pad = src[0] as usize; + + // Drop the padding + let _ = src.split_to(1); + } + + // Read the stream dependency + let stream_dep = if flags.is_priority() { + if src.len() < 5 { + return Err(Error::MalformedMessage); + } + let stream_dep = StreamDependency::load(&src[..5])?; + + if stream_dep.dependency_id() == head.stream_id() { + return Err(Error::InvalidDependencyId); + } + + // Drop the next 5 bytes + let _ = src.split_to(5); + + Some(stream_dep) + } else { + None + }; + + if pad > 0 { + if pad > src.len() { + return Err(Error::TooMuchPadding); + } + + let len = src.len() - pad; + src.truncate(len); + } + + let headers = Headers { + stream_id: head.stream_id(), + stream_dep, + header_block: HeaderBlock { + fields: HeaderMap::new(), + is_over_size: false, + pseudo: Pseudo::default(), + }, + flags, + }; + + Ok((headers, src)) + } + + pub fn load_hpack( + &mut self, + src: &mut BytesMut, + max_header_list_size: usize, + decoder: &mut hpack::Decoder, + ) -> Result<(), Error> { + self.header_block.load(src, max_header_list_size, decoder) + } + + pub fn stream_id(&self) -> StreamId { + self.stream_id + } + + pub fn is_end_headers(&self) -> bool { + self.flags.is_end_headers() + } + + pub fn set_end_headers(&mut self) { + self.flags.set_end_headers(); + } + + pub fn is_end_stream(&self) -> bool { + self.flags.is_end_stream() + } + + pub fn set_end_stream(&mut self) { + self.flags.set_end_stream() + } + + pub fn is_over_size(&self) -> bool { + self.header_block.is_over_size + } + + pub fn into_parts(self) -> (Pseudo, HeaderMap) { + (self.header_block.pseudo, self.header_block.fields) + } + + #[cfg(feature = "unstable")] + pub fn pseudo_mut(&mut self) -> &mut Pseudo { + &mut self.header_block.pseudo + } + + /// Whether it has status 1xx + pub(crate) fn is_informational(&self) -> bool { + self.header_block.pseudo.is_informational() + } + + pub fn fields(&self) -> &HeaderMap { + &self.header_block.fields + } + + pub fn into_fields(self) -> HeaderMap { + self.header_block.fields + } + + pub fn encode( + self, + encoder: &mut hpack::Encoder, + dst: &mut EncodeBuf<'_>, + ) -> Option<Continuation> { + // At this point, the `is_end_headers` flag should always be set + debug_assert!(self.flags.is_end_headers()); + + // Get the HEADERS frame head + let head = self.head(); + + self.header_block + .into_encoding(encoder) + .encode(&head, dst, |_| {}) + } + + fn head(&self) -> Head { + Head::new(Kind::Headers, self.flags.into(), self.stream_id) + } +} + +impl<T> From<Headers> for Frame<T> { + fn from(src: Headers) -> Self { + Frame::Headers(src) + } +} + +impl fmt::Debug for Headers { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + let mut builder = f.debug_struct("Headers"); + builder + .field("stream_id", &self.stream_id) + .field("flags", &self.flags); + + if let Some(ref protocol) = self.header_block.pseudo.protocol { + builder.field("protocol", protocol); + } + + if let Some(ref dep) = self.stream_dep { + builder.field("stream_dep", dep); + } + + // `fields` and `pseudo` purposefully not included + builder.finish() + } +} + +// ===== util ===== + +pub fn parse_u64(src: &[u8]) -> Result<u64, ()> { + if src.len() > 19 { + // At danger for overflow... + return Err(()); + } + + let mut ret = 0; + + for &d in src { + if d < b'0' || d > b'9' { + return Err(()); + } + + ret *= 10; + ret += (d - b'0') as u64; + } + + Ok(ret) +} + +// ===== impl PushPromise ===== + +#[derive(Debug)] +pub enum PushPromiseHeaderError { + InvalidContentLength(Result<u64, ()>), + NotSafeAndCacheable, +} + +impl PushPromise { + pub fn new( + stream_id: StreamId, + promised_id: StreamId, + pseudo: Pseudo, + fields: HeaderMap, + ) -> Self { + PushPromise { + flags: PushPromiseFlag::default(), + header_block: HeaderBlock { + fields, + is_over_size: false, + pseudo, + }, + promised_id, + stream_id, + } + } + + pub fn validate_request(req: &Request<()>) -> Result<(), PushPromiseHeaderError> { + use PushPromiseHeaderError::*; + // The spec has some requirements for promised request headers + // [https://httpwg.org/specs/rfc7540.html#PushRequests] + + // A promised request "that indicates the presence of a request body + // MUST reset the promised stream with a stream error" + if let Some(content_length) = req.headers().get(header::CONTENT_LENGTH) { + let parsed_length = parse_u64(content_length.as_bytes()); + if parsed_length != Ok(0) { + return Err(InvalidContentLength(parsed_length)); + } + } + // "The server MUST include a method in the :method pseudo-header field + // that is safe and cacheable" + if !Self::safe_and_cacheable(req.method()) { + return Err(NotSafeAndCacheable); + } + + Ok(()) + } + + fn safe_and_cacheable(method: &Method) -> bool { + // Cacheable: https://httpwg.org/specs/rfc7231.html#cacheable.methods + // Safe: https://httpwg.org/specs/rfc7231.html#safe.methods + return method == Method::GET || method == Method::HEAD; + } + + pub fn fields(&self) -> &HeaderMap { + &self.header_block.fields + } + + #[cfg(feature = "unstable")] + pub fn into_fields(self) -> HeaderMap { + self.header_block.fields + } + + /// Loads the push promise frame but doesn't actually do HPACK decoding. + /// + /// HPACK decoding is done in the `load_hpack` step. + pub fn load(head: Head, mut src: BytesMut) -> Result<(Self, BytesMut), Error> { + let flags = PushPromiseFlag(head.flag()); + let mut pad = 0; + + if head.stream_id().is_zero() { + return Err(Error::InvalidStreamId); + } + + // Read the padding length + if flags.is_padded() { + if src.is_empty() { + return Err(Error::MalformedMessage); + } + + // TODO: Ensure payload is sized correctly + pad = src[0] as usize; + + // Drop the padding + let _ = src.split_to(1); + } + + if src.len() < 5 { + return Err(Error::MalformedMessage); + } + + let (promised_id, _) = StreamId::parse(&src[..4]); + // Drop promised_id bytes + let _ = src.split_to(4); + + if pad > 0 { + if pad > src.len() { + return Err(Error::TooMuchPadding); + } + + let len = src.len() - pad; + src.truncate(len); + } + + let frame = PushPromise { + flags, + header_block: HeaderBlock { + fields: HeaderMap::new(), + is_over_size: false, + pseudo: Pseudo::default(), + }, + promised_id, + stream_id: head.stream_id(), + }; + Ok((frame, src)) + } + + pub fn load_hpack( + &mut self, + src: &mut BytesMut, + max_header_list_size: usize, + decoder: &mut hpack::Decoder, + ) -> Result<(), Error> { + self.header_block.load(src, max_header_list_size, decoder) + } + + pub fn stream_id(&self) -> StreamId { + self.stream_id + } + + pub fn promised_id(&self) -> StreamId { + self.promised_id + } + + pub fn is_end_headers(&self) -> bool { + self.flags.is_end_headers() + } + + pub fn set_end_headers(&mut self) { + self.flags.set_end_headers(); + } + + pub fn is_over_size(&self) -> bool { + self.header_block.is_over_size + } + + pub fn encode( + self, + encoder: &mut hpack::Encoder, + dst: &mut EncodeBuf<'_>, + ) -> Option<Continuation> { + // At this point, the `is_end_headers` flag should always be set + debug_assert!(self.flags.is_end_headers()); + + let head = self.head(); + let promised_id = self.promised_id; + + self.header_block + .into_encoding(encoder) + .encode(&head, dst, |dst| { + dst.put_u32(promised_id.into()); + }) + } + + fn head(&self) -> Head { + Head::new(Kind::PushPromise, self.flags.into(), self.stream_id) + } + + /// Consume `self`, returning the parts of the frame + pub fn into_parts(self) -> (Pseudo, HeaderMap) { + (self.header_block.pseudo, self.header_block.fields) + } +} + +impl<T> From<PushPromise> for Frame<T> { + fn from(src: PushPromise) -> Self { + Frame::PushPromise(src) + } +} + +impl fmt::Debug for PushPromise { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.debug_struct("PushPromise") + .field("stream_id", &self.stream_id) + .field("promised_id", &self.promised_id) + .field("flags", &self.flags) + // `fields` and `pseudo` purposefully not included + .finish() + } +} + +// ===== impl Continuation ===== + +impl Continuation { + fn head(&self) -> Head { + Head::new(Kind::Continuation, END_HEADERS, self.stream_id) + } + + pub fn encode(self, dst: &mut EncodeBuf<'_>) -> Option<Continuation> { + // Get the CONTINUATION frame head + let head = self.head(); + + self.header_block.encode(&head, dst, |_| {}) + } +} + +// ===== impl Pseudo ===== + +impl Pseudo { + pub fn request(method: Method, uri: Uri, protocol: Option<Protocol>) -> Self { + let parts = uri::Parts::from(uri); + + let mut path = parts + .path_and_query + .map(|v| BytesStr::from(v.as_str())) + .unwrap_or(BytesStr::from_static("")); + + match method { + Method::OPTIONS | Method::CONNECT => {} + _ if path.is_empty() => { + path = BytesStr::from_static("/"); + } + _ => {} + } + + let mut pseudo = Pseudo { + method: Some(method), + scheme: None, + authority: None, + path: Some(path).filter(|p| !p.is_empty()), + protocol, + status: None, + }; + + // If the URI includes a scheme component, add it to the pseudo headers + // + // TODO: Scheme must be set... + if let Some(scheme) = parts.scheme { + pseudo.set_scheme(scheme); + } + + // If the URI includes an authority component, add it to the pseudo + // headers + if let Some(authority) = parts.authority { + pseudo.set_authority(BytesStr::from(authority.as_str())); + } + + pseudo + } + + pub fn response(status: StatusCode) -> Self { + Pseudo { + method: None, + scheme: None, + authority: None, + path: None, + protocol: None, + status: Some(status), + } + } + + #[cfg(feature = "unstable")] + pub fn set_status(&mut self, value: StatusCode) { + self.status = Some(value); + } + + pub fn set_scheme(&mut self, scheme: uri::Scheme) { + let bytes_str = match scheme.as_str() { + "http" => BytesStr::from_static("http"), + "https" => BytesStr::from_static("https"), + s => BytesStr::from(s), + }; + self.scheme = Some(bytes_str); + } + + #[cfg(feature = "unstable")] + pub fn set_protocol(&mut self, protocol: Protocol) { + self.protocol = Some(protocol); + } + + pub fn set_authority(&mut self, authority: BytesStr) { + self.authority = Some(authority); + } + + /// Whether it has status 1xx + pub(crate) fn is_informational(&self) -> bool { + self.status + .map_or(false, |status| status.is_informational()) + } +} + +// ===== impl EncodingHeaderBlock ===== + +impl EncodingHeaderBlock { + fn encode<F>(mut self, head: &Head, dst: &mut EncodeBuf<'_>, f: F) -> Option<Continuation> + where + F: FnOnce(&mut EncodeBuf<'_>), + { + let head_pos = dst.get_ref().len(); + + // At this point, we don't know how big the h2 frame will be. + // So, we write the head with length 0, then write the body, and + // finally write the length once we know the size. + head.encode(0, dst); + + let payload_pos = dst.get_ref().len(); + + f(dst); + + // Now, encode the header payload + let continuation = if self.hpack.len() > dst.remaining_mut() { + dst.put_slice(&self.hpack.split_to(dst.remaining_mut())); + + Some(Continuation { + stream_id: head.stream_id(), + header_block: self, + }) + } else { + dst.put_slice(&self.hpack); + + None + }; + + // Compute the header block length + let payload_len = (dst.get_ref().len() - payload_pos) as u64; + + // Write the frame length + let payload_len_be = payload_len.to_be_bytes(); + assert!(payload_len_be[0..5].iter().all(|b| *b == 0)); + (dst.get_mut()[head_pos..head_pos + 3]).copy_from_slice(&payload_len_be[5..]); + + if continuation.is_some() { + // There will be continuation frames, so the `is_end_headers` flag + // must be unset + debug_assert!(dst.get_ref()[head_pos + 4] & END_HEADERS == END_HEADERS); + + dst.get_mut()[head_pos + 4] -= END_HEADERS; + } + + continuation + } +} + +// ===== impl Iter ===== + +impl Iterator for Iter { + type Item = hpack::Header<Option<HeaderName>>; + + fn next(&mut self) -> Option<Self::Item> { + use crate::hpack::Header::*; + + if let Some(ref mut pseudo) = self.pseudo { + if let Some(method) = pseudo.method.take() { + return Some(Method(method)); + } + + if let Some(scheme) = pseudo.scheme.take() { + return Some(Scheme(scheme)); + } + + if let Some(authority) = pseudo.authority.take() { + return Some(Authority(authority)); + } + + if let Some(path) = pseudo.path.take() { + return Some(Path(path)); + } + + if let Some(protocol) = pseudo.protocol.take() { + return Some(Protocol(protocol)); + } + + if let Some(status) = pseudo.status.take() { + return Some(Status(status)); + } + } + + self.pseudo = None; + + self.fields + .next() + .map(|(name, value)| Field { name, value }) + } +} + +// ===== impl HeadersFlag ===== + +impl HeadersFlag { + pub fn empty() -> HeadersFlag { + HeadersFlag(0) + } + + pub fn load(bits: u8) -> HeadersFlag { + HeadersFlag(bits & ALL) + } + + pub fn is_end_stream(&self) -> bool { + self.0 & END_STREAM == END_STREAM + } + + pub fn set_end_stream(&mut self) { + self.0 |= END_STREAM; + } + + pub fn is_end_headers(&self) -> bool { + self.0 & END_HEADERS == END_HEADERS + } + + pub fn set_end_headers(&mut self) { + self.0 |= END_HEADERS; + } + + pub fn is_padded(&self) -> bool { + self.0 & PADDED == PADDED + } + + pub fn is_priority(&self) -> bool { + self.0 & PRIORITY == PRIORITY + } +} + +impl Default for HeadersFlag { + /// Returns a `HeadersFlag` value with `END_HEADERS` set. + fn default() -> Self { + HeadersFlag(END_HEADERS) + } +} + +impl From<HeadersFlag> for u8 { + fn from(src: HeadersFlag) -> u8 { + src.0 + } +} + +impl fmt::Debug for HeadersFlag { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + util::debug_flags(fmt, self.0) + .flag_if(self.is_end_headers(), "END_HEADERS") + .flag_if(self.is_end_stream(), "END_STREAM") + .flag_if(self.is_padded(), "PADDED") + .flag_if(self.is_priority(), "PRIORITY") + .finish() + } +} + +// ===== impl PushPromiseFlag ===== + +impl PushPromiseFlag { + pub fn empty() -> PushPromiseFlag { + PushPromiseFlag(0) + } + + pub fn load(bits: u8) -> PushPromiseFlag { + PushPromiseFlag(bits & ALL) + } + + pub fn is_end_headers(&self) -> bool { + self.0 & END_HEADERS == END_HEADERS + } + + pub fn set_end_headers(&mut self) { + self.0 |= END_HEADERS; + } + + pub fn is_padded(&self) -> bool { + self.0 & PADDED == PADDED + } +} + +impl Default for PushPromiseFlag { + /// Returns a `PushPromiseFlag` value with `END_HEADERS` set. + fn default() -> Self { + PushPromiseFlag(END_HEADERS) + } +} + +impl From<PushPromiseFlag> for u8 { + fn from(src: PushPromiseFlag) -> u8 { + src.0 + } +} + +impl fmt::Debug for PushPromiseFlag { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + util::debug_flags(fmt, self.0) + .flag_if(self.is_end_headers(), "END_HEADERS") + .flag_if(self.is_padded(), "PADDED") + .finish() + } +} + +// ===== HeaderBlock ===== + +impl HeaderBlock { + fn load( + &mut self, + src: &mut BytesMut, + max_header_list_size: usize, + decoder: &mut hpack::Decoder, + ) -> Result<(), Error> { + let mut reg = !self.fields.is_empty(); + let mut malformed = false; + let mut headers_size = self.calculate_header_list_size(); + + macro_rules! set_pseudo { + ($field:ident, $val:expr) => {{ + if reg { + tracing::trace!("load_hpack; header malformed -- pseudo not at head of block"); + malformed = true; + } else if self.pseudo.$field.is_some() { + tracing::trace!("load_hpack; header malformed -- repeated pseudo"); + malformed = true; + } else { + let __val = $val; + headers_size += + decoded_header_size(stringify!($field).len() + 1, __val.as_str().len()); + if headers_size < max_header_list_size { + self.pseudo.$field = Some(__val); + } else if !self.is_over_size { + tracing::trace!("load_hpack; header list size over max"); + self.is_over_size = true; + } + } + }}; + } + + let mut cursor = Cursor::new(src); + + // If the header frame is malformed, we still have to continue decoding + // the headers. A malformed header frame is a stream level error, but + // the hpack state is connection level. In order to maintain correct + // state for other streams, the hpack decoding process must complete. + let res = decoder.decode(&mut cursor, |header| { + use crate::hpack::Header::*; + + match header { + Field { name, value } => { + // Connection level header fields are not supported and must + // result in a protocol error. + + if name == header::CONNECTION + || name == header::TRANSFER_ENCODING + || name == header::UPGRADE + || name == "keep-alive" + || name == "proxy-connection" + { + tracing::trace!("load_hpack; connection level header"); + malformed = true; + } else if name == header::TE && value != "trailers" { + tracing::trace!( + "load_hpack; TE header not set to trailers; val={:?}", + value + ); + malformed = true; + } else { + reg = true; + + headers_size += decoded_header_size(name.as_str().len(), value.len()); + if headers_size < max_header_list_size { + self.fields.append(name, value); + } else if !self.is_over_size { + tracing::trace!("load_hpack; header list size over max"); + self.is_over_size = true; + } + } + } + Authority(v) => set_pseudo!(authority, v), + Method(v) => set_pseudo!(method, v), + Scheme(v) => set_pseudo!(scheme, v), + Path(v) => set_pseudo!(path, v), + Protocol(v) => set_pseudo!(protocol, v), + Status(v) => set_pseudo!(status, v), + } + }); + + if let Err(e) = res { + tracing::trace!("hpack decoding error; err={:?}", e); + return Err(e.into()); + } + + if malformed { + tracing::trace!("malformed message"); + return Err(Error::MalformedMessage); + } + + Ok(()) + } + + fn into_encoding(self, encoder: &mut hpack::Encoder) -> EncodingHeaderBlock { + let mut hpack = BytesMut::new(); + let headers = Iter { + pseudo: Some(self.pseudo), + fields: self.fields.into_iter(), + }; + + encoder.encode(headers, &mut hpack); + + EncodingHeaderBlock { + hpack: hpack.freeze(), + } + } + + /// Calculates the size of the currently decoded header list. + /// + /// According to http://httpwg.org/specs/rfc7540.html#SETTINGS_MAX_HEADER_LIST_SIZE + /// + /// > The value is based on the uncompressed size of header fields, + /// > including the length of the name and value in octets plus an + /// > overhead of 32 octets for each header field. + fn calculate_header_list_size(&self) -> usize { + macro_rules! pseudo_size { + ($name:ident) => {{ + self.pseudo + .$name + .as_ref() + .map(|m| decoded_header_size(stringify!($name).len() + 1, m.as_str().len())) + .unwrap_or(0) + }}; + } + + pseudo_size!(method) + + pseudo_size!(scheme) + + pseudo_size!(status) + + pseudo_size!(authority) + + pseudo_size!(path) + + self + .fields + .iter() + .map(|(name, value)| decoded_header_size(name.as_str().len(), value.len())) + .sum::<usize>() + } +} + +fn decoded_header_size(name: usize, value: usize) -> usize { + name + value + 32 +} + +#[cfg(test)] +mod test { + use std::iter::FromIterator; + + use http::HeaderValue; + + use super::*; + use crate::frame; + use crate::hpack::{huffman, Encoder}; + + #[test] + fn test_nameless_header_at_resume() { + let mut encoder = Encoder::default(); + let mut dst = BytesMut::new(); + + let headers = Headers::new( + StreamId::ZERO, + Default::default(), + HeaderMap::from_iter(vec![ + ( + HeaderName::from_static("hello"), + HeaderValue::from_static("world"), + ), + ( + HeaderName::from_static("hello"), + HeaderValue::from_static("zomg"), + ), + ( + HeaderName::from_static("hello"), + HeaderValue::from_static("sup"), + ), + ]), + ); + + let continuation = headers + .encode(&mut encoder, &mut (&mut dst).limit(frame::HEADER_LEN + 8)) + .unwrap(); + + assert_eq!(17, dst.len()); + assert_eq!([0, 0, 8, 1, 0, 0, 0, 0, 0], &dst[0..9]); + assert_eq!(&[0x40, 0x80 | 4], &dst[9..11]); + assert_eq!("hello", huff_decode(&dst[11..15])); + assert_eq!(0x80 | 4, dst[15]); + + let mut world = dst[16..17].to_owned(); + + dst.clear(); + + assert!(continuation + .encode(&mut (&mut dst).limit(frame::HEADER_LEN + 16)) + .is_none()); + + world.extend_from_slice(&dst[9..12]); + assert_eq!("world", huff_decode(&world)); + + assert_eq!(24, dst.len()); + assert_eq!([0, 0, 15, 9, 4, 0, 0, 0, 0], &dst[0..9]); + + // // Next is not indexed + assert_eq!(&[15, 47, 0x80 | 3], &dst[12..15]); + assert_eq!("zomg", huff_decode(&dst[15..18])); + assert_eq!(&[15, 47, 0x80 | 3], &dst[18..21]); + assert_eq!("sup", huff_decode(&dst[21..])); + } + + fn huff_decode(src: &[u8]) -> BytesMut { + let mut buf = BytesMut::new(); + huffman::decode(src, &mut buf).unwrap() + } +} diff --git a/third_party/rust/h2/src/frame/mod.rs b/third_party/rust/h2/src/frame/mod.rs new file mode 100644 index 0000000000..570a162a8d --- /dev/null +++ b/third_party/rust/h2/src/frame/mod.rs @@ -0,0 +1,171 @@ +use crate::hpack; + +use bytes::Bytes; + +use std::fmt; + +/// A helper macro that unpacks a sequence of 4 bytes found in the buffer with +/// the given identifier, starting at the given offset, into the given integer +/// type. Obviously, the integer type should be able to support at least 4 +/// bytes. +/// +/// # Examples +/// +/// ```ignore +/// # // We ignore this doctest because the macro is not exported. +/// let buf: [u8; 4] = [0, 0, 0, 1]; +/// assert_eq!(1u32, unpack_octets_4!(buf, 0, u32)); +/// ``` +macro_rules! unpack_octets_4 { + // TODO: Get rid of this macro + ($buf:expr, $offset:expr, $tip:ty) => { + (($buf[$offset + 0] as $tip) << 24) + | (($buf[$offset + 1] as $tip) << 16) + | (($buf[$offset + 2] as $tip) << 8) + | (($buf[$offset + 3] as $tip) << 0) + }; +} + +#[cfg(test)] +mod tests { + #[test] + fn test_unpack_octets_4() { + let buf: [u8; 4] = [0, 0, 0, 1]; + assert_eq!(1u32, unpack_octets_4!(buf, 0, u32)); + } +} + +mod data; +mod go_away; +mod head; +mod headers; +mod ping; +mod priority; +mod reason; +mod reset; +mod settings; +mod stream_id; +mod util; +mod window_update; + +pub use self::data::Data; +pub use self::go_away::GoAway; +pub use self::head::{Head, Kind}; +pub use self::headers::{ + parse_u64, Continuation, Headers, Pseudo, PushPromise, PushPromiseHeaderError, +}; +pub use self::ping::Ping; +pub use self::priority::{Priority, StreamDependency}; +pub use self::reason::Reason; +pub use self::reset::Reset; +pub use self::settings::Settings; +pub use self::stream_id::{StreamId, StreamIdOverflow}; +pub use self::window_update::WindowUpdate; + +#[cfg(feature = "unstable")] +pub use crate::hpack::BytesStr; + +// Re-export some constants + +pub use self::settings::{ + DEFAULT_INITIAL_WINDOW_SIZE, DEFAULT_MAX_FRAME_SIZE, DEFAULT_SETTINGS_HEADER_TABLE_SIZE, + MAX_INITIAL_WINDOW_SIZE, MAX_MAX_FRAME_SIZE, +}; + +pub type FrameSize = u32; + +pub const HEADER_LEN: usize = 9; + +#[derive(Eq, PartialEq)] +pub enum Frame<T = Bytes> { + Data(Data<T>), + Headers(Headers), + Priority(Priority), + PushPromise(PushPromise), + Settings(Settings), + Ping(Ping), + GoAway(GoAway), + WindowUpdate(WindowUpdate), + Reset(Reset), +} + +impl<T> Frame<T> { + pub fn map<F, U>(self, f: F) -> Frame<U> + where + F: FnOnce(T) -> U, + { + use self::Frame::*; + + match self { + Data(frame) => frame.map(f).into(), + Headers(frame) => frame.into(), + Priority(frame) => frame.into(), + PushPromise(frame) => frame.into(), + Settings(frame) => frame.into(), + Ping(frame) => frame.into(), + GoAway(frame) => frame.into(), + WindowUpdate(frame) => frame.into(), + Reset(frame) => frame.into(), + } + } +} + +impl<T> fmt::Debug for Frame<T> { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + use self::Frame::*; + + match *self { + Data(ref frame) => fmt::Debug::fmt(frame, fmt), + Headers(ref frame) => fmt::Debug::fmt(frame, fmt), + Priority(ref frame) => fmt::Debug::fmt(frame, fmt), + PushPromise(ref frame) => fmt::Debug::fmt(frame, fmt), + Settings(ref frame) => fmt::Debug::fmt(frame, fmt), + Ping(ref frame) => fmt::Debug::fmt(frame, fmt), + GoAway(ref frame) => fmt::Debug::fmt(frame, fmt), + WindowUpdate(ref frame) => fmt::Debug::fmt(frame, fmt), + Reset(ref frame) => fmt::Debug::fmt(frame, fmt), + } + } +} + +/// Errors that can occur during parsing an HTTP/2 frame. +#[derive(Debug, Clone, PartialEq, Eq)] +pub enum Error { + /// A length value other than 8 was set on a PING message. + BadFrameSize, + + /// The padding length was larger than the frame-header-specified + /// length of the payload. + TooMuchPadding, + + /// An invalid setting value was provided + InvalidSettingValue, + + /// An invalid window update value + InvalidWindowUpdateValue, + + /// The payload length specified by the frame header was not the + /// value necessary for the specific frame type. + InvalidPayloadLength, + + /// Received a payload with an ACK settings frame + InvalidPayloadAckSettings, + + /// An invalid stream identifier was provided. + /// + /// This is returned if a SETTINGS or PING frame is received with a stream + /// identifier other than zero. + InvalidStreamId, + + /// A request or response is malformed. + MalformedMessage, + + /// An invalid stream dependency ID was provided + /// + /// This is returned if a HEADERS or PRIORITY frame is received with an + /// invalid stream identifier. + InvalidDependencyId, + + /// Failed to perform HPACK decoding + Hpack(hpack::DecoderError), +} diff --git a/third_party/rust/h2/src/frame/ping.rs b/third_party/rust/h2/src/frame/ping.rs new file mode 100644 index 0000000000..241d06ea17 --- /dev/null +++ b/third_party/rust/h2/src/frame/ping.rs @@ -0,0 +1,102 @@ +use crate::frame::{Error, Frame, Head, Kind, StreamId}; +use bytes::BufMut; + +const ACK_FLAG: u8 = 0x1; + +pub type Payload = [u8; 8]; + +#[derive(Debug, Eq, PartialEq)] +pub struct Ping { + ack: bool, + payload: Payload, +} + +// This was just 8 randomly generated bytes. We use something besides just +// zeroes to distinguish this specific PING from any other. +const SHUTDOWN_PAYLOAD: Payload = [0x0b, 0x7b, 0xa2, 0xf0, 0x8b, 0x9b, 0xfe, 0x54]; +const USER_PAYLOAD: Payload = [0x3b, 0x7c, 0xdb, 0x7a, 0x0b, 0x87, 0x16, 0xb4]; + +impl Ping { + #[cfg(feature = "unstable")] + pub const SHUTDOWN: Payload = SHUTDOWN_PAYLOAD; + + #[cfg(not(feature = "unstable"))] + pub(crate) const SHUTDOWN: Payload = SHUTDOWN_PAYLOAD; + + #[cfg(feature = "unstable")] + pub const USER: Payload = USER_PAYLOAD; + + #[cfg(not(feature = "unstable"))] + pub(crate) const USER: Payload = USER_PAYLOAD; + + pub fn new(payload: Payload) -> Ping { + Ping { + ack: false, + payload, + } + } + + pub fn pong(payload: Payload) -> Ping { + Ping { ack: true, payload } + } + + pub fn is_ack(&self) -> bool { + self.ack + } + + pub fn payload(&self) -> &Payload { + &self.payload + } + + pub fn into_payload(self) -> Payload { + self.payload + } + + /// Builds a `Ping` frame from a raw frame. + pub fn load(head: Head, bytes: &[u8]) -> Result<Ping, Error> { + debug_assert_eq!(head.kind(), crate::frame::Kind::Ping); + + // PING frames are not associated with any individual stream. If a PING + // frame is received with a stream identifier field value other than + // 0x0, the recipient MUST respond with a connection error + // (Section 5.4.1) of type PROTOCOL_ERROR. + if !head.stream_id().is_zero() { + return Err(Error::InvalidStreamId); + } + + // In addition to the frame header, PING frames MUST contain 8 octets of opaque + // data in the payload. + if bytes.len() != 8 { + return Err(Error::BadFrameSize); + } + + let mut payload = [0; 8]; + payload.copy_from_slice(bytes); + + // The PING frame defines the following flags: + // + // ACK (0x1): When set, bit 0 indicates that this PING frame is a PING + // response. An endpoint MUST set this flag in PING responses. An + // endpoint MUST NOT respond to PING frames containing this flag. + let ack = head.flag() & ACK_FLAG != 0; + + Ok(Ping { ack, payload }) + } + + pub fn encode<B: BufMut>(&self, dst: &mut B) { + let sz = self.payload.len(); + tracing::trace!("encoding PING; ack={} len={}", self.ack, sz); + + let flags = if self.ack { ACK_FLAG } else { 0 }; + let head = Head::new(Kind::Ping, flags, StreamId::zero()); + + head.encode(sz, dst); + dst.put_slice(&self.payload); + } +} + +impl<T> From<Ping> for Frame<T> { + fn from(src: Ping) -> Frame<T> { + Frame::Ping(src) + } +} diff --git a/third_party/rust/h2/src/frame/priority.rs b/third_party/rust/h2/src/frame/priority.rs new file mode 100644 index 0000000000..d7d47dbb01 --- /dev/null +++ b/third_party/rust/h2/src/frame/priority.rs @@ -0,0 +1,72 @@ +use crate::frame::*; + +#[derive(Debug, Eq, PartialEq)] +pub struct Priority { + stream_id: StreamId, + dependency: StreamDependency, +} + +#[derive(Debug, Eq, PartialEq)] +pub struct StreamDependency { + /// The ID of the stream dependency target + dependency_id: StreamId, + + /// The weight for the stream. The value exposed (and set) here is always in + /// the range [0, 255], instead of [1, 256] (as defined in section 5.3.2.) + /// so that the value fits into a `u8`. + weight: u8, + + /// True if the stream dependency is exclusive. + is_exclusive: bool, +} + +impl Priority { + pub fn load(head: Head, payload: &[u8]) -> Result<Self, Error> { + let dependency = StreamDependency::load(payload)?; + + if dependency.dependency_id() == head.stream_id() { + return Err(Error::InvalidDependencyId); + } + + Ok(Priority { + stream_id: head.stream_id(), + dependency, + }) + } +} + +impl<B> From<Priority> for Frame<B> { + fn from(src: Priority) -> Self { + Frame::Priority(src) + } +} + +// ===== impl StreamDependency ===== + +impl StreamDependency { + pub fn new(dependency_id: StreamId, weight: u8, is_exclusive: bool) -> Self { + StreamDependency { + dependency_id, + weight, + is_exclusive, + } + } + + pub fn load(src: &[u8]) -> Result<Self, Error> { + if src.len() != 5 { + return Err(Error::InvalidPayloadLength); + } + + // Parse the stream ID and exclusive flag + let (dependency_id, is_exclusive) = StreamId::parse(&src[..4]); + + // Read the weight + let weight = src[4]; + + Ok(StreamDependency::new(dependency_id, weight, is_exclusive)) + } + + pub fn dependency_id(&self) -> StreamId { + self.dependency_id + } +} diff --git a/third_party/rust/h2/src/frame/reason.rs b/third_party/rust/h2/src/frame/reason.rs new file mode 100644 index 0000000000..ff5e2012f8 --- /dev/null +++ b/third_party/rust/h2/src/frame/reason.rs @@ -0,0 +1,134 @@ +use std::fmt; + +/// HTTP/2 error codes. +/// +/// Error codes are used in `RST_STREAM` and `GOAWAY` frames to convey the +/// reasons for the stream or connection error. For example, +/// [`SendStream::send_reset`] takes a `Reason` argument. Also, the `Error` type +/// may contain a `Reason`. +/// +/// Error codes share a common code space. Some error codes apply only to +/// streams, others apply only to connections, and others may apply to either. +/// See [RFC 7540] for more information. +/// +/// See [Error Codes in the spec][spec]. +/// +/// [spec]: http://httpwg.org/specs/rfc7540.html#ErrorCodes +/// [`SendStream::send_reset`]: struct.SendStream.html#method.send_reset +#[derive(PartialEq, Eq, Clone, Copy)] +pub struct Reason(u32); + +impl Reason { + /// The associated condition is not a result of an error. + /// + /// For example, a GOAWAY might include this code to indicate graceful + /// shutdown of a connection. + pub const NO_ERROR: Reason = Reason(0); + /// The endpoint detected an unspecific protocol error. + /// + /// This error is for use when a more specific error code is not available. + pub const PROTOCOL_ERROR: Reason = Reason(1); + /// The endpoint encountered an unexpected internal error. + pub const INTERNAL_ERROR: Reason = Reason(2); + /// The endpoint detected that its peer violated the flow-control protocol. + pub const FLOW_CONTROL_ERROR: Reason = Reason(3); + /// The endpoint sent a SETTINGS frame but did not receive a response in + /// a timely manner. + pub const SETTINGS_TIMEOUT: Reason = Reason(4); + /// The endpoint received a frame after a stream was half-closed. + pub const STREAM_CLOSED: Reason = Reason(5); + /// The endpoint received a frame with an invalid size. + pub const FRAME_SIZE_ERROR: Reason = Reason(6); + /// The endpoint refused the stream prior to performing any application + /// processing. + pub const REFUSED_STREAM: Reason = Reason(7); + /// Used by the endpoint to indicate that the stream is no longer needed. + pub const CANCEL: Reason = Reason(8); + /// The endpoint is unable to maintain the header compression context for + /// the connection. + pub const COMPRESSION_ERROR: Reason = Reason(9); + /// The connection established in response to a CONNECT request was reset + /// or abnormally closed. + pub const CONNECT_ERROR: Reason = Reason(10); + /// The endpoint detected that its peer is exhibiting a behavior that might + /// be generating excessive load. + pub const ENHANCE_YOUR_CALM: Reason = Reason(11); + /// The underlying transport has properties that do not meet minimum + /// security requirements. + pub const INADEQUATE_SECURITY: Reason = Reason(12); + /// The endpoint requires that HTTP/1.1 be used instead of HTTP/2. + pub const HTTP_1_1_REQUIRED: Reason = Reason(13); + + /// Get a string description of the error code. + pub fn description(&self) -> &str { + match self.0 { + 0 => "not a result of an error", + 1 => "unspecific protocol error detected", + 2 => "unexpected internal error encountered", + 3 => "flow-control protocol violated", + 4 => "settings ACK not received in timely manner", + 5 => "received frame when stream half-closed", + 6 => "frame with invalid size", + 7 => "refused stream before processing any application logic", + 8 => "stream no longer needed", + 9 => "unable to maintain the header compression context", + 10 => { + "connection established in response to a CONNECT request was reset or abnormally \ + closed" + } + 11 => "detected excessive load generating behavior", + 12 => "security properties do not meet minimum requirements", + 13 => "endpoint requires HTTP/1.1", + _ => "unknown reason", + } + } +} + +impl From<u32> for Reason { + fn from(src: u32) -> Reason { + Reason(src) + } +} + +impl From<Reason> for u32 { + fn from(src: Reason) -> u32 { + src.0 + } +} + +impl fmt::Debug for Reason { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + let name = match self.0 { + 0 => "NO_ERROR", + 1 => "PROTOCOL_ERROR", + 2 => "INTERNAL_ERROR", + 3 => "FLOW_CONTROL_ERROR", + 4 => "SETTINGS_TIMEOUT", + 5 => "STREAM_CLOSED", + 6 => "FRAME_SIZE_ERROR", + 7 => "REFUSED_STREAM", + 8 => "CANCEL", + 9 => "COMPRESSION_ERROR", + 10 => "CONNECT_ERROR", + 11 => "ENHANCE_YOUR_CALM", + 12 => "INADEQUATE_SECURITY", + 13 => "HTTP_1_1_REQUIRED", + other => return f.debug_tuple("Reason").field(&Hex(other)).finish(), + }; + f.write_str(name) + } +} + +struct Hex(u32); + +impl fmt::Debug for Hex { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + fmt::LowerHex::fmt(&self.0, f) + } +} + +impl fmt::Display for Reason { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + write!(fmt, "{}", self.description()) + } +} diff --git a/third_party/rust/h2/src/frame/reset.rs b/third_party/rust/h2/src/frame/reset.rs new file mode 100644 index 0000000000..39f6ac2022 --- /dev/null +++ b/third_party/rust/h2/src/frame/reset.rs @@ -0,0 +1,56 @@ +use crate::frame::{self, Error, Head, Kind, Reason, StreamId}; + +use bytes::BufMut; + +#[derive(Copy, Clone, Debug, Eq, PartialEq)] +pub struct Reset { + stream_id: StreamId, + error_code: Reason, +} + +impl Reset { + pub fn new(stream_id: StreamId, error: Reason) -> Reset { + Reset { + stream_id, + error_code: error, + } + } + + pub fn stream_id(&self) -> StreamId { + self.stream_id + } + + pub fn reason(&self) -> Reason { + self.error_code + } + + pub fn load(head: Head, payload: &[u8]) -> Result<Reset, Error> { + if payload.len() != 4 { + return Err(Error::InvalidPayloadLength); + } + + let error_code = unpack_octets_4!(payload, 0, u32); + + Ok(Reset { + stream_id: head.stream_id(), + error_code: error_code.into(), + }) + } + + pub fn encode<B: BufMut>(&self, dst: &mut B) { + tracing::trace!( + "encoding RESET; id={:?} code={:?}", + self.stream_id, + self.error_code + ); + let head = Head::new(Kind::Reset, 0, self.stream_id); + head.encode(4, dst); + dst.put_u32(self.error_code.into()); + } +} + +impl<B> From<Reset> for frame::Frame<B> { + fn from(src: Reset) -> Self { + frame::Frame::Reset(src) + } +} diff --git a/third_party/rust/h2/src/frame/settings.rs b/third_party/rust/h2/src/frame/settings.rs new file mode 100644 index 0000000000..080d0f4e58 --- /dev/null +++ b/third_party/rust/h2/src/frame/settings.rs @@ -0,0 +1,391 @@ +use std::fmt; + +use crate::frame::{util, Error, Frame, FrameSize, Head, Kind, StreamId}; +use bytes::{BufMut, BytesMut}; + +#[derive(Clone, Default, Eq, PartialEq)] +pub struct Settings { + flags: SettingsFlags, + // Fields + header_table_size: Option<u32>, + enable_push: Option<u32>, + max_concurrent_streams: Option<u32>, + initial_window_size: Option<u32>, + max_frame_size: Option<u32>, + max_header_list_size: Option<u32>, + enable_connect_protocol: Option<u32>, +} + +/// An enum that lists all valid settings that can be sent in a SETTINGS +/// frame. +/// +/// Each setting has a value that is a 32 bit unsigned integer (6.5.1.). +#[derive(Debug)] +pub enum Setting { + HeaderTableSize(u32), + EnablePush(u32), + MaxConcurrentStreams(u32), + InitialWindowSize(u32), + MaxFrameSize(u32), + MaxHeaderListSize(u32), + EnableConnectProtocol(u32), +} + +#[derive(Copy, Clone, Eq, PartialEq, Default)] +pub struct SettingsFlags(u8); + +const ACK: u8 = 0x1; +const ALL: u8 = ACK; + +/// The default value of SETTINGS_HEADER_TABLE_SIZE +pub const DEFAULT_SETTINGS_HEADER_TABLE_SIZE: usize = 4_096; + +/// The default value of SETTINGS_INITIAL_WINDOW_SIZE +pub const DEFAULT_INITIAL_WINDOW_SIZE: u32 = 65_535; + +/// The default value of MAX_FRAME_SIZE +pub const DEFAULT_MAX_FRAME_SIZE: FrameSize = 16_384; + +/// INITIAL_WINDOW_SIZE upper bound +pub const MAX_INITIAL_WINDOW_SIZE: usize = (1 << 31) - 1; + +/// MAX_FRAME_SIZE upper bound +pub const MAX_MAX_FRAME_SIZE: FrameSize = (1 << 24) - 1; + +// ===== impl Settings ===== + +impl Settings { + pub fn ack() -> Settings { + Settings { + flags: SettingsFlags::ack(), + ..Settings::default() + } + } + + pub fn is_ack(&self) -> bool { + self.flags.is_ack() + } + + pub fn initial_window_size(&self) -> Option<u32> { + self.initial_window_size + } + + pub fn set_initial_window_size(&mut self, size: Option<u32>) { + self.initial_window_size = size; + } + + pub fn max_concurrent_streams(&self) -> Option<u32> { + self.max_concurrent_streams + } + + pub fn set_max_concurrent_streams(&mut self, max: Option<u32>) { + self.max_concurrent_streams = max; + } + + pub fn max_frame_size(&self) -> Option<u32> { + self.max_frame_size + } + + pub fn set_max_frame_size(&mut self, size: Option<u32>) { + if let Some(val) = size { + assert!(DEFAULT_MAX_FRAME_SIZE <= val && val <= MAX_MAX_FRAME_SIZE); + } + self.max_frame_size = size; + } + + pub fn max_header_list_size(&self) -> Option<u32> { + self.max_header_list_size + } + + pub fn set_max_header_list_size(&mut self, size: Option<u32>) { + self.max_header_list_size = size; + } + + pub fn is_push_enabled(&self) -> Option<bool> { + self.enable_push.map(|val| val != 0) + } + + pub fn set_enable_push(&mut self, enable: bool) { + self.enable_push = Some(enable as u32); + } + + pub fn is_extended_connect_protocol_enabled(&self) -> Option<bool> { + self.enable_connect_protocol.map(|val| val != 0) + } + + pub fn set_enable_connect_protocol(&mut self, val: Option<u32>) { + self.enable_connect_protocol = val; + } + + pub fn header_table_size(&self) -> Option<u32> { + self.header_table_size + } + + /* + pub fn set_header_table_size(&mut self, size: Option<u32>) { + self.header_table_size = size; + } + */ + + pub fn load(head: Head, payload: &[u8]) -> Result<Settings, Error> { + use self::Setting::*; + + debug_assert_eq!(head.kind(), crate::frame::Kind::Settings); + + if !head.stream_id().is_zero() { + return Err(Error::InvalidStreamId); + } + + // Load the flag + let flag = SettingsFlags::load(head.flag()); + + if flag.is_ack() { + // Ensure that the payload is empty + if !payload.is_empty() { + return Err(Error::InvalidPayloadLength); + } + + // Return the ACK frame + return Ok(Settings::ack()); + } + + // Ensure the payload length is correct, each setting is 6 bytes long. + if payload.len() % 6 != 0 { + tracing::debug!("invalid settings payload length; len={:?}", payload.len()); + return Err(Error::InvalidPayloadAckSettings); + } + + let mut settings = Settings::default(); + debug_assert!(!settings.flags.is_ack()); + + for raw in payload.chunks(6) { + match Setting::load(raw) { + Some(HeaderTableSize(val)) => { + settings.header_table_size = Some(val); + } + Some(EnablePush(val)) => match val { + 0 | 1 => { + settings.enable_push = Some(val); + } + _ => { + return Err(Error::InvalidSettingValue); + } + }, + Some(MaxConcurrentStreams(val)) => { + settings.max_concurrent_streams = Some(val); + } + Some(InitialWindowSize(val)) => { + if val as usize > MAX_INITIAL_WINDOW_SIZE { + return Err(Error::InvalidSettingValue); + } else { + settings.initial_window_size = Some(val); + } + } + Some(MaxFrameSize(val)) => { + if val < DEFAULT_MAX_FRAME_SIZE || val > MAX_MAX_FRAME_SIZE { + return Err(Error::InvalidSettingValue); + } else { + settings.max_frame_size = Some(val); + } + } + Some(MaxHeaderListSize(val)) => { + settings.max_header_list_size = Some(val); + } + Some(EnableConnectProtocol(val)) => match val { + 0 | 1 => { + settings.enable_connect_protocol = Some(val); + } + _ => { + return Err(Error::InvalidSettingValue); + } + }, + None => {} + } + } + + Ok(settings) + } + + fn payload_len(&self) -> usize { + let mut len = 0; + self.for_each(|_| len += 6); + len + } + + pub fn encode(&self, dst: &mut BytesMut) { + // Create & encode an appropriate frame head + let head = Head::new(Kind::Settings, self.flags.into(), StreamId::zero()); + let payload_len = self.payload_len(); + + tracing::trace!("encoding SETTINGS; len={}", payload_len); + + head.encode(payload_len, dst); + + // Encode the settings + self.for_each(|setting| { + tracing::trace!("encoding setting; val={:?}", setting); + setting.encode(dst) + }); + } + + fn for_each<F: FnMut(Setting)>(&self, mut f: F) { + use self::Setting::*; + + if let Some(v) = self.header_table_size { + f(HeaderTableSize(v)); + } + + if let Some(v) = self.enable_push { + f(EnablePush(v)); + } + + if let Some(v) = self.max_concurrent_streams { + f(MaxConcurrentStreams(v)); + } + + if let Some(v) = self.initial_window_size { + f(InitialWindowSize(v)); + } + + if let Some(v) = self.max_frame_size { + f(MaxFrameSize(v)); + } + + if let Some(v) = self.max_header_list_size { + f(MaxHeaderListSize(v)); + } + + if let Some(v) = self.enable_connect_protocol { + f(EnableConnectProtocol(v)); + } + } +} + +impl<T> From<Settings> for Frame<T> { + fn from(src: Settings) -> Frame<T> { + Frame::Settings(src) + } +} + +impl fmt::Debug for Settings { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + let mut builder = f.debug_struct("Settings"); + builder.field("flags", &self.flags); + + self.for_each(|setting| match setting { + Setting::EnablePush(v) => { + builder.field("enable_push", &v); + } + Setting::HeaderTableSize(v) => { + builder.field("header_table_size", &v); + } + Setting::InitialWindowSize(v) => { + builder.field("initial_window_size", &v); + } + Setting::MaxConcurrentStreams(v) => { + builder.field("max_concurrent_streams", &v); + } + Setting::MaxFrameSize(v) => { + builder.field("max_frame_size", &v); + } + Setting::MaxHeaderListSize(v) => { + builder.field("max_header_list_size", &v); + } + Setting::EnableConnectProtocol(v) => { + builder.field("enable_connect_protocol", &v); + } + }); + + builder.finish() + } +} + +// ===== impl Setting ===== + +impl Setting { + /// Creates a new `Setting` with the correct variant corresponding to the + /// given setting id, based on the settings IDs defined in section + /// 6.5.2. + pub fn from_id(id: u16, val: u32) -> Option<Setting> { + use self::Setting::*; + + match id { + 1 => Some(HeaderTableSize(val)), + 2 => Some(EnablePush(val)), + 3 => Some(MaxConcurrentStreams(val)), + 4 => Some(InitialWindowSize(val)), + 5 => Some(MaxFrameSize(val)), + 6 => Some(MaxHeaderListSize(val)), + 8 => Some(EnableConnectProtocol(val)), + _ => None, + } + } + + /// Creates a new `Setting` by parsing the given buffer of 6 bytes, which + /// contains the raw byte representation of the setting, according to the + /// "SETTINGS format" defined in section 6.5.1. + /// + /// The `raw` parameter should have length at least 6 bytes, since the + /// length of the raw setting is exactly 6 bytes. + /// + /// # Panics + /// + /// If given a buffer shorter than 6 bytes, the function will panic. + fn load(raw: &[u8]) -> Option<Setting> { + let id: u16 = (u16::from(raw[0]) << 8) | u16::from(raw[1]); + let val: u32 = unpack_octets_4!(raw, 2, u32); + + Setting::from_id(id, val) + } + + fn encode(&self, dst: &mut BytesMut) { + use self::Setting::*; + + let (kind, val) = match *self { + HeaderTableSize(v) => (1, v), + EnablePush(v) => (2, v), + MaxConcurrentStreams(v) => (3, v), + InitialWindowSize(v) => (4, v), + MaxFrameSize(v) => (5, v), + MaxHeaderListSize(v) => (6, v), + EnableConnectProtocol(v) => (8, v), + }; + + dst.put_u16(kind); + dst.put_u32(val); + } +} + +// ===== impl SettingsFlags ===== + +impl SettingsFlags { + pub fn empty() -> SettingsFlags { + SettingsFlags(0) + } + + pub fn load(bits: u8) -> SettingsFlags { + SettingsFlags(bits & ALL) + } + + pub fn ack() -> SettingsFlags { + SettingsFlags(ACK) + } + + pub fn is_ack(&self) -> bool { + self.0 & ACK == ACK + } +} + +impl From<SettingsFlags> for u8 { + fn from(src: SettingsFlags) -> u8 { + src.0 + } +} + +impl fmt::Debug for SettingsFlags { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + util::debug_flags(f, self.0) + .flag_if(self.is_ack(), "ACK") + .finish() + } +} diff --git a/third_party/rust/h2/src/frame/stream_id.rs b/third_party/rust/h2/src/frame/stream_id.rs new file mode 100644 index 0000000000..10a14d3c82 --- /dev/null +++ b/third_party/rust/h2/src/frame/stream_id.rs @@ -0,0 +1,96 @@ +use std::u32; + +/// A stream identifier, as described in [Section 5.1.1] of RFC 7540. +/// +/// Streams are identified with an unsigned 31-bit integer. Streams +/// initiated by a client MUST use odd-numbered stream identifiers; those +/// initiated by the server MUST use even-numbered stream identifiers. A +/// stream identifier of zero (0x0) is used for connection control +/// messages; the stream identifier of zero cannot be used to establish a +/// new stream. +/// +/// [Section 5.1.1]: https://tools.ietf.org/html/rfc7540#section-5.1.1 +#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)] +pub struct StreamId(u32); + +#[derive(Debug, Copy, Clone)] +pub struct StreamIdOverflow; + +const STREAM_ID_MASK: u32 = 1 << 31; + +impl StreamId { + /// Stream ID 0. + pub const ZERO: StreamId = StreamId(0); + + /// The maximum allowed stream ID. + pub const MAX: StreamId = StreamId(u32::MAX >> 1); + + /// Parse the stream ID + #[inline] + pub fn parse(buf: &[u8]) -> (StreamId, bool) { + let mut ubuf = [0; 4]; + ubuf.copy_from_slice(&buf[0..4]); + let unpacked = u32::from_be_bytes(ubuf); + let flag = unpacked & STREAM_ID_MASK == STREAM_ID_MASK; + + // Now clear the most significant bit, as that is reserved and MUST be + // ignored when received. + (StreamId(unpacked & !STREAM_ID_MASK), flag) + } + + /// Returns true if this stream ID corresponds to a stream that + /// was initiated by the client. + pub fn is_client_initiated(&self) -> bool { + let id = self.0; + id != 0 && id % 2 == 1 + } + + /// Returns true if this stream ID corresponds to a stream that + /// was initiated by the server. + pub fn is_server_initiated(&self) -> bool { + let id = self.0; + id != 0 && id % 2 == 0 + } + + /// Return a new `StreamId` for stream 0. + #[inline] + pub fn zero() -> StreamId { + StreamId::ZERO + } + + /// Returns true if this stream ID is zero. + pub fn is_zero(&self) -> bool { + self.0 == 0 + } + + /// Returns the next stream ID initiated by the same peer as this stream + /// ID, or an error if incrementing this stream ID would overflow the + /// maximum. + pub fn next_id(&self) -> Result<StreamId, StreamIdOverflow> { + let next = self.0 + 2; + if next > StreamId::MAX.0 { + Err(StreamIdOverflow) + } else { + Ok(StreamId(next)) + } + } +} + +impl From<u32> for StreamId { + fn from(src: u32) -> Self { + assert_eq!(src & STREAM_ID_MASK, 0, "invalid stream ID -- MSB is set"); + StreamId(src) + } +} + +impl From<StreamId> for u32 { + fn from(src: StreamId) -> Self { + src.0 + } +} + +impl PartialEq<u32> for StreamId { + fn eq(&self, other: &u32) -> bool { + self.0 == *other + } +} diff --git a/third_party/rust/h2/src/frame/util.rs b/third_party/rust/h2/src/frame/util.rs new file mode 100644 index 0000000000..6bee7bd9bb --- /dev/null +++ b/third_party/rust/h2/src/frame/util.rs @@ -0,0 +1,79 @@ +use std::fmt; + +use super::Error; +use bytes::Bytes; + +/// Strip padding from the given payload. +/// +/// It is assumed that the frame had the padded flag set. This means that the +/// first byte is the length of the padding with that many +/// 0 bytes expected to follow the actual payload. +/// +/// # Returns +/// +/// A slice of the given payload where the actual one is found and the length +/// of the padding. +/// +/// If the padded payload is invalid (e.g. the length of the padding is equal +/// to the total length), returns `None`. +pub fn strip_padding(payload: &mut Bytes) -> Result<u8, Error> { + let payload_len = payload.len(); + if payload_len == 0 { + // If this is the case, the frame is invalid as no padding length can be + // extracted, even though the frame should be padded. + return Err(Error::TooMuchPadding); + } + + let pad_len = payload[0] as usize; + + if pad_len >= payload_len { + // This is invalid: the padding length MUST be less than the + // total frame size. + return Err(Error::TooMuchPadding); + } + + let _ = payload.split_to(1); + let _ = payload.split_off(payload_len - pad_len - 1); + + Ok(pad_len as u8) +} + +pub(super) fn debug_flags<'a, 'f: 'a>( + fmt: &'a mut fmt::Formatter<'f>, + bits: u8, +) -> DebugFlags<'a, 'f> { + let result = write!(fmt, "({:#x}", bits); + DebugFlags { + fmt, + result, + started: false, + } +} + +pub(super) struct DebugFlags<'a, 'f: 'a> { + fmt: &'a mut fmt::Formatter<'f>, + result: fmt::Result, + started: bool, +} + +impl<'a, 'f: 'a> DebugFlags<'a, 'f> { + pub(super) fn flag_if(&mut self, enabled: bool, name: &str) -> &mut Self { + if enabled { + self.result = self.result.and_then(|()| { + let prefix = if self.started { + " | " + } else { + self.started = true; + ": " + }; + + write!(self.fmt, "{}{}", prefix, name) + }); + } + self + } + + pub(super) fn finish(&mut self) -> fmt::Result { + self.result.and_then(|()| write!(self.fmt, ")")) + } +} diff --git a/third_party/rust/h2/src/frame/window_update.rs b/third_party/rust/h2/src/frame/window_update.rs new file mode 100644 index 0000000000..eed2ce17ec --- /dev/null +++ b/third_party/rust/h2/src/frame/window_update.rs @@ -0,0 +1,62 @@ +use crate::frame::{self, Error, Head, Kind, StreamId}; + +use bytes::BufMut; + +const SIZE_INCREMENT_MASK: u32 = 1 << 31; + +#[derive(Debug, Copy, Clone, Eq, PartialEq)] +pub struct WindowUpdate { + stream_id: StreamId, + size_increment: u32, +} + +impl WindowUpdate { + pub fn new(stream_id: StreamId, size_increment: u32) -> WindowUpdate { + WindowUpdate { + stream_id, + size_increment, + } + } + + pub fn stream_id(&self) -> StreamId { + self.stream_id + } + + pub fn size_increment(&self) -> u32 { + self.size_increment + } + + /// Builds a `WindowUpdate` frame from a raw frame. + pub fn load(head: Head, payload: &[u8]) -> Result<WindowUpdate, Error> { + debug_assert_eq!(head.kind(), crate::frame::Kind::WindowUpdate); + if payload.len() != 4 { + return Err(Error::BadFrameSize); + } + + // Clear the most significant bit, as that is reserved and MUST be ignored + // when received. + let size_increment = unpack_octets_4!(payload, 0, u32) & !SIZE_INCREMENT_MASK; + + if size_increment == 0 { + return Err(Error::InvalidWindowUpdateValue); + } + + Ok(WindowUpdate { + stream_id: head.stream_id(), + size_increment, + }) + } + + pub fn encode<B: BufMut>(&self, dst: &mut B) { + tracing::trace!("encoding WINDOW_UPDATE; id={:?}", self.stream_id); + let head = Head::new(Kind::WindowUpdate, 0, self.stream_id); + head.encode(4, dst); + dst.put_u32(self.size_increment); + } +} + +impl<B> From<WindowUpdate> for frame::Frame<B> { + fn from(src: WindowUpdate) -> Self { + frame::Frame::WindowUpdate(src) + } +} diff --git a/third_party/rust/h2/src/fuzz_bridge.rs b/third_party/rust/h2/src/fuzz_bridge.rs new file mode 100644 index 0000000000..3ea8b591c9 --- /dev/null +++ b/third_party/rust/h2/src/fuzz_bridge.rs @@ -0,0 +1,28 @@ +#[cfg(fuzzing)] +pub mod fuzz_logic { + use crate::hpack; + use bytes::BytesMut; + use http::header::HeaderName; + use std::io::Cursor; + + pub fn fuzz_hpack(data_: &[u8]) { + let mut decoder_ = hpack::Decoder::new(0); + let mut buf = BytesMut::new(); + buf.extend(data_); + let _dec_res = decoder_.decode(&mut Cursor::new(&mut buf), |_h| {}); + + if let Ok(s) = std::str::from_utf8(data_) { + if let Ok(h) = http::Method::from_bytes(s.as_bytes()) { + let m_ = hpack::Header::Method(h); + let mut encoder = hpack::Encoder::new(0, 0); + let _res = encode(&mut encoder, vec![m_]); + } + } + } + + fn encode(e: &mut hpack::Encoder, hdrs: Vec<hpack::Header<Option<HeaderName>>>) -> BytesMut { + let mut dst = BytesMut::with_capacity(1024); + e.encode(&mut hdrs.into_iter(), &mut dst); + dst + } +} diff --git a/third_party/rust/h2/src/hpack/decoder.rs b/third_party/rust/h2/src/hpack/decoder.rs new file mode 100644 index 0000000000..988b48db11 --- /dev/null +++ b/third_party/rust/h2/src/hpack/decoder.rs @@ -0,0 +1,940 @@ +use super::{header::BytesStr, huffman, Header}; +use crate::frame; + +use bytes::{Buf, Bytes, BytesMut}; +use http::header; +use http::method::{self, Method}; +use http::status::{self, StatusCode}; + +use std::cmp; +use std::collections::VecDeque; +use std::io::Cursor; +use std::str::Utf8Error; + +/// Decodes headers using HPACK +#[derive(Debug)] +pub struct Decoder { + // Protocol indicated that the max table size will update + max_size_update: Option<usize>, + last_max_update: usize, + table: Table, + buffer: BytesMut, +} + +/// Represents all errors that can be encountered while performing the decoding +/// of an HPACK header set. +#[derive(Debug, Copy, Clone, PartialEq, Eq)] +pub enum DecoderError { + InvalidRepresentation, + InvalidIntegerPrefix, + InvalidTableIndex, + InvalidHuffmanCode, + InvalidUtf8, + InvalidStatusCode, + InvalidPseudoheader, + InvalidMaxDynamicSize, + IntegerOverflow, + NeedMore(NeedMore), +} + +#[derive(Debug, Copy, Clone, PartialEq, Eq)] +pub enum NeedMore { + UnexpectedEndOfStream, + IntegerUnderflow, + StringUnderflow, +} + +enum Representation { + /// Indexed header field representation + /// + /// An indexed header field representation identifies an entry in either the + /// static table or the dynamic table (see Section 2.3). + /// + /// # Header encoding + /// + /// ```text + /// 0 1 2 3 4 5 6 7 + /// +---+---+---+---+---+---+---+---+ + /// | 1 | Index (7+) | + /// +---+---------------------------+ + /// ``` + Indexed, + + /// Literal Header Field with Incremental Indexing + /// + /// A literal header field with incremental indexing representation results + /// in appending a header field to the decoded header list and inserting it + /// as a new entry into the dynamic table. + /// + /// # Header encoding + /// + /// ```text + /// 0 1 2 3 4 5 6 7 + /// +---+---+---+---+---+---+---+---+ + /// | 0 | 1 | Index (6+) | + /// +---+---+-----------------------+ + /// | H | Value Length (7+) | + /// +---+---------------------------+ + /// | Value String (Length octets) | + /// +-------------------------------+ + /// ``` + LiteralWithIndexing, + + /// Literal Header Field without Indexing + /// + /// A literal header field without indexing representation results in + /// appending a header field to the decoded header list without altering the + /// dynamic table. + /// + /// # Header encoding + /// + /// ```text + /// 0 1 2 3 4 5 6 7 + /// +---+---+---+---+---+---+---+---+ + /// | 0 | 0 | 0 | 0 | Index (4+) | + /// +---+---+-----------------------+ + /// | H | Value Length (7+) | + /// +---+---------------------------+ + /// | Value String (Length octets) | + /// +-------------------------------+ + /// ``` + LiteralWithoutIndexing, + + /// Literal Header Field Never Indexed + /// + /// A literal header field never-indexed representation results in appending + /// a header field to the decoded header list without altering the dynamic + /// table. Intermediaries MUST use the same representation for encoding this + /// header field. + /// + /// ```text + /// 0 1 2 3 4 5 6 7 + /// +---+---+---+---+---+---+---+---+ + /// | 0 | 0 | 0 | 1 | Index (4+) | + /// +---+---+-----------------------+ + /// | H | Value Length (7+) | + /// +---+---------------------------+ + /// | Value String (Length octets) | + /// +-------------------------------+ + /// ``` + LiteralNeverIndexed, + + /// Dynamic Table Size Update + /// + /// A dynamic table size update signals a change to the size of the dynamic + /// table. + /// + /// # Header encoding + /// + /// ```text + /// 0 1 2 3 4 5 6 7 + /// +---+---+---+---+---+---+---+---+ + /// | 0 | 0 | 1 | Max size (5+) | + /// +---+---------------------------+ + /// ``` + SizeUpdate, +} + +#[derive(Debug)] +struct Table { + entries: VecDeque<Header>, + size: usize, + max_size: usize, +} + +struct StringMarker { + offset: usize, + len: usize, + string: Option<Bytes>, +} + +// ===== impl Decoder ===== + +impl Decoder { + /// Creates a new `Decoder` with all settings set to default values. + pub fn new(size: usize) -> Decoder { + Decoder { + max_size_update: None, + last_max_update: size, + table: Table::new(size), + buffer: BytesMut::with_capacity(4096), + } + } + + /// Queues a potential size update + #[allow(dead_code)] + pub fn queue_size_update(&mut self, size: usize) { + let size = match self.max_size_update { + Some(v) => cmp::max(v, size), + None => size, + }; + + self.max_size_update = Some(size); + } + + /// Decodes the headers found in the given buffer. + pub fn decode<F>( + &mut self, + src: &mut Cursor<&mut BytesMut>, + mut f: F, + ) -> Result<(), DecoderError> + where + F: FnMut(Header), + { + use self::Representation::*; + + let mut can_resize = true; + + if let Some(size) = self.max_size_update.take() { + self.last_max_update = size; + } + + let span = tracing::trace_span!("hpack::decode"); + let _e = span.enter(); + + tracing::trace!("decode"); + + while let Some(ty) = peek_u8(src) { + // At this point we are always at the beginning of the next block + // within the HPACK data. The type of the block can always be + // determined from the first byte. + match Representation::load(ty)? { + Indexed => { + tracing::trace!(rem = src.remaining(), kind = %"Indexed"); + can_resize = false; + let entry = self.decode_indexed(src)?; + consume(src); + f(entry); + } + LiteralWithIndexing => { + tracing::trace!(rem = src.remaining(), kind = %"LiteralWithIndexing"); + can_resize = false; + let entry = self.decode_literal(src, true)?; + + // Insert the header into the table + self.table.insert(entry.clone()); + consume(src); + + f(entry); + } + LiteralWithoutIndexing => { + tracing::trace!(rem = src.remaining(), kind = %"LiteralWithoutIndexing"); + can_resize = false; + let entry = self.decode_literal(src, false)?; + consume(src); + f(entry); + } + LiteralNeverIndexed => { + tracing::trace!(rem = src.remaining(), kind = %"LiteralNeverIndexed"); + can_resize = false; + let entry = self.decode_literal(src, false)?; + consume(src); + + // TODO: Track that this should never be indexed + + f(entry); + } + SizeUpdate => { + tracing::trace!(rem = src.remaining(), kind = %"SizeUpdate"); + if !can_resize { + return Err(DecoderError::InvalidMaxDynamicSize); + } + + // Handle the dynamic table size update + self.process_size_update(src)?; + consume(src); + } + } + } + + Ok(()) + } + + fn process_size_update(&mut self, buf: &mut Cursor<&mut BytesMut>) -> Result<(), DecoderError> { + let new_size = decode_int(buf, 5)?; + + if new_size > self.last_max_update { + return Err(DecoderError::InvalidMaxDynamicSize); + } + + tracing::debug!( + from = self.table.size(), + to = new_size, + "Decoder changed max table size" + ); + + self.table.set_max_size(new_size); + + Ok(()) + } + + fn decode_indexed(&self, buf: &mut Cursor<&mut BytesMut>) -> Result<Header, DecoderError> { + let index = decode_int(buf, 7)?; + self.table.get(index) + } + + fn decode_literal( + &mut self, + buf: &mut Cursor<&mut BytesMut>, + index: bool, + ) -> Result<Header, DecoderError> { + let prefix = if index { 6 } else { 4 }; + + // Extract the table index for the name, or 0 if not indexed + let table_idx = decode_int(buf, prefix)?; + + // First, read the header name + if table_idx == 0 { + let old_pos = buf.position(); + let name_marker = self.try_decode_string(buf)?; + let value_marker = self.try_decode_string(buf)?; + buf.set_position(old_pos); + // Read the name as a literal + let name = name_marker.consume(buf); + let value = value_marker.consume(buf); + Header::new(name, value) + } else { + let e = self.table.get(table_idx)?; + let value = self.decode_string(buf)?; + + e.name().into_entry(value) + } + } + + fn try_decode_string( + &mut self, + buf: &mut Cursor<&mut BytesMut>, + ) -> Result<StringMarker, DecoderError> { + let old_pos = buf.position(); + const HUFF_FLAG: u8 = 0b1000_0000; + + // The first bit in the first byte contains the huffman encoded flag. + let huff = match peek_u8(buf) { + Some(hdr) => (hdr & HUFF_FLAG) == HUFF_FLAG, + None => return Err(DecoderError::NeedMore(NeedMore::UnexpectedEndOfStream)), + }; + + // Decode the string length using 7 bit prefix + let len = decode_int(buf, 7)?; + + if len > buf.remaining() { + tracing::trace!(len, remaining = buf.remaining(), "decode_string underflow",); + return Err(DecoderError::NeedMore(NeedMore::StringUnderflow)); + } + + let offset = (buf.position() - old_pos) as usize; + if huff { + let ret = { + let raw = &buf.chunk()[..len]; + huffman::decode(raw, &mut self.buffer).map(|buf| StringMarker { + offset, + len, + string: Some(BytesMut::freeze(buf)), + }) + }; + + buf.advance(len); + ret + } else { + buf.advance(len); + Ok(StringMarker { + offset, + len, + string: None, + }) + } + } + + fn decode_string(&mut self, buf: &mut Cursor<&mut BytesMut>) -> Result<Bytes, DecoderError> { + let old_pos = buf.position(); + let marker = self.try_decode_string(buf)?; + buf.set_position(old_pos); + Ok(marker.consume(buf)) + } +} + +impl Default for Decoder { + fn default() -> Decoder { + Decoder::new(4096) + } +} + +// ===== impl Representation ===== + +impl Representation { + pub fn load(byte: u8) -> Result<Representation, DecoderError> { + const INDEXED: u8 = 0b1000_0000; + const LITERAL_WITH_INDEXING: u8 = 0b0100_0000; + const LITERAL_WITHOUT_INDEXING: u8 = 0b1111_0000; + const LITERAL_NEVER_INDEXED: u8 = 0b0001_0000; + const SIZE_UPDATE_MASK: u8 = 0b1110_0000; + const SIZE_UPDATE: u8 = 0b0010_0000; + + // TODO: What did I even write here? + + if byte & INDEXED == INDEXED { + Ok(Representation::Indexed) + } else if byte & LITERAL_WITH_INDEXING == LITERAL_WITH_INDEXING { + Ok(Representation::LiteralWithIndexing) + } else if byte & LITERAL_WITHOUT_INDEXING == 0 { + Ok(Representation::LiteralWithoutIndexing) + } else if byte & LITERAL_WITHOUT_INDEXING == LITERAL_NEVER_INDEXED { + Ok(Representation::LiteralNeverIndexed) + } else if byte & SIZE_UPDATE_MASK == SIZE_UPDATE { + Ok(Representation::SizeUpdate) + } else { + Err(DecoderError::InvalidRepresentation) + } + } +} + +fn decode_int<B: Buf>(buf: &mut B, prefix_size: u8) -> Result<usize, DecoderError> { + // The octet limit is chosen such that the maximum allowed *value* can + // never overflow an unsigned 32-bit integer. The maximum value of any + // integer that can be encoded with 5 octets is ~2^28 + const MAX_BYTES: usize = 5; + const VARINT_MASK: u8 = 0b0111_1111; + const VARINT_FLAG: u8 = 0b1000_0000; + + if prefix_size < 1 || prefix_size > 8 { + return Err(DecoderError::InvalidIntegerPrefix); + } + + if !buf.has_remaining() { + return Err(DecoderError::NeedMore(NeedMore::IntegerUnderflow)); + } + + let mask = if prefix_size == 8 { + 0xFF + } else { + (1u8 << prefix_size).wrapping_sub(1) + }; + + let mut ret = (buf.get_u8() & mask) as usize; + + if ret < mask as usize { + // Value fits in the prefix bits + return Ok(ret); + } + + // The int did not fit in the prefix bits, so continue reading. + // + // The total number of bytes used to represent the int. The first byte was + // the prefix, so start at 1. + let mut bytes = 1; + + // The rest of the int is stored as a varint -- 7 bits for the value and 1 + // bit to indicate if it is the last byte. + let mut shift = 0; + + while buf.has_remaining() { + let b = buf.get_u8(); + + bytes += 1; + ret += ((b & VARINT_MASK) as usize) << shift; + shift += 7; + + if b & VARINT_FLAG == 0 { + return Ok(ret); + } + + if bytes == MAX_BYTES { + // The spec requires that this situation is an error + return Err(DecoderError::IntegerOverflow); + } + } + + Err(DecoderError::NeedMore(NeedMore::IntegerUnderflow)) +} + +fn peek_u8<B: Buf>(buf: &mut B) -> Option<u8> { + if buf.has_remaining() { + Some(buf.chunk()[0]) + } else { + None + } +} + +fn take(buf: &mut Cursor<&mut BytesMut>, n: usize) -> Bytes { + let pos = buf.position() as usize; + let mut head = buf.get_mut().split_to(pos + n); + buf.set_position(0); + head.advance(pos); + head.freeze() +} + +impl StringMarker { + fn consume(self, buf: &mut Cursor<&mut BytesMut>) -> Bytes { + buf.advance(self.offset); + match self.string { + Some(string) => { + buf.advance(self.len); + string + } + None => take(buf, self.len), + } + } +} + +fn consume(buf: &mut Cursor<&mut BytesMut>) { + // remove bytes from the internal BytesMut when they have been successfully + // decoded. This is a more permanent cursor position, which will be + // used to resume if decoding was only partial. + take(buf, 0); +} + +// ===== impl Table ===== + +impl Table { + fn new(max_size: usize) -> Table { + Table { + entries: VecDeque::new(), + size: 0, + max_size, + } + } + + fn size(&self) -> usize { + self.size + } + + /// Returns the entry located at the given index. + /// + /// The table is 1-indexed and constructed in such a way that the first + /// entries belong to the static table, followed by entries in the dynamic + /// table. They are merged into a single index address space, though. + /// + /// This is according to the [HPACK spec, section 2.3.3.] + /// (http://http2.github.io/http2-spec/compression.html#index.address.space) + pub fn get(&self, index: usize) -> Result<Header, DecoderError> { + if index == 0 { + return Err(DecoderError::InvalidTableIndex); + } + + if index <= 61 { + return Ok(get_static(index)); + } + + // Convert the index for lookup in the entries structure. + match self.entries.get(index - 62) { + Some(e) => Ok(e.clone()), + None => Err(DecoderError::InvalidTableIndex), + } + } + + fn insert(&mut self, entry: Header) { + let len = entry.len(); + + self.reserve(len); + + if self.size + len <= self.max_size { + self.size += len; + + // Track the entry + self.entries.push_front(entry); + } + } + + fn set_max_size(&mut self, size: usize) { + self.max_size = size; + // Make the table size fit within the new constraints. + self.consolidate(); + } + + fn reserve(&mut self, size: usize) { + while self.size + size > self.max_size { + match self.entries.pop_back() { + Some(last) => { + self.size -= last.len(); + } + None => return, + } + } + } + + fn consolidate(&mut self) { + while self.size > self.max_size { + { + let last = match self.entries.back() { + Some(x) => x, + None => { + // Can never happen as the size of the table must reach + // 0 by the time we've exhausted all elements. + panic!("Size of table != 0, but no headers left!"); + } + }; + + self.size -= last.len(); + } + + self.entries.pop_back(); + } + } +} + +// ===== impl DecoderError ===== + +impl From<Utf8Error> for DecoderError { + fn from(_: Utf8Error) -> DecoderError { + // TODO: Better error? + DecoderError::InvalidUtf8 + } +} + +impl From<header::InvalidHeaderValue> for DecoderError { + fn from(_: header::InvalidHeaderValue) -> DecoderError { + // TODO: Better error? + DecoderError::InvalidUtf8 + } +} + +impl From<header::InvalidHeaderName> for DecoderError { + fn from(_: header::InvalidHeaderName) -> DecoderError { + // TODO: Better error + DecoderError::InvalidUtf8 + } +} + +impl From<method::InvalidMethod> for DecoderError { + fn from(_: method::InvalidMethod) -> DecoderError { + // TODO: Better error + DecoderError::InvalidUtf8 + } +} + +impl From<status::InvalidStatusCode> for DecoderError { + fn from(_: status::InvalidStatusCode) -> DecoderError { + // TODO: Better error + DecoderError::InvalidUtf8 + } +} + +impl From<DecoderError> for frame::Error { + fn from(src: DecoderError) -> Self { + frame::Error::Hpack(src) + } +} + +/// Get an entry from the static table +pub fn get_static(idx: usize) -> Header { + use http::header::HeaderValue; + + match idx { + 1 => Header::Authority(BytesStr::from_static("")), + 2 => Header::Method(Method::GET), + 3 => Header::Method(Method::POST), + 4 => Header::Path(BytesStr::from_static("/")), + 5 => Header::Path(BytesStr::from_static("/index.html")), + 6 => Header::Scheme(BytesStr::from_static("http")), + 7 => Header::Scheme(BytesStr::from_static("https")), + 8 => Header::Status(StatusCode::OK), + 9 => Header::Status(StatusCode::NO_CONTENT), + 10 => Header::Status(StatusCode::PARTIAL_CONTENT), + 11 => Header::Status(StatusCode::NOT_MODIFIED), + 12 => Header::Status(StatusCode::BAD_REQUEST), + 13 => Header::Status(StatusCode::NOT_FOUND), + 14 => Header::Status(StatusCode::INTERNAL_SERVER_ERROR), + 15 => Header::Field { + name: header::ACCEPT_CHARSET, + value: HeaderValue::from_static(""), + }, + 16 => Header::Field { + name: header::ACCEPT_ENCODING, + value: HeaderValue::from_static("gzip, deflate"), + }, + 17 => Header::Field { + name: header::ACCEPT_LANGUAGE, + value: HeaderValue::from_static(""), + }, + 18 => Header::Field { + name: header::ACCEPT_RANGES, + value: HeaderValue::from_static(""), + }, + 19 => Header::Field { + name: header::ACCEPT, + value: HeaderValue::from_static(""), + }, + 20 => Header::Field { + name: header::ACCESS_CONTROL_ALLOW_ORIGIN, + value: HeaderValue::from_static(""), + }, + 21 => Header::Field { + name: header::AGE, + value: HeaderValue::from_static(""), + }, + 22 => Header::Field { + name: header::ALLOW, + value: HeaderValue::from_static(""), + }, + 23 => Header::Field { + name: header::AUTHORIZATION, + value: HeaderValue::from_static(""), + }, + 24 => Header::Field { + name: header::CACHE_CONTROL, + value: HeaderValue::from_static(""), + }, + 25 => Header::Field { + name: header::CONTENT_DISPOSITION, + value: HeaderValue::from_static(""), + }, + 26 => Header::Field { + name: header::CONTENT_ENCODING, + value: HeaderValue::from_static(""), + }, + 27 => Header::Field { + name: header::CONTENT_LANGUAGE, + value: HeaderValue::from_static(""), + }, + 28 => Header::Field { + name: header::CONTENT_LENGTH, + value: HeaderValue::from_static(""), + }, + 29 => Header::Field { + name: header::CONTENT_LOCATION, + value: HeaderValue::from_static(""), + }, + 30 => Header::Field { + name: header::CONTENT_RANGE, + value: HeaderValue::from_static(""), + }, + 31 => Header::Field { + name: header::CONTENT_TYPE, + value: HeaderValue::from_static(""), + }, + 32 => Header::Field { + name: header::COOKIE, + value: HeaderValue::from_static(""), + }, + 33 => Header::Field { + name: header::DATE, + value: HeaderValue::from_static(""), + }, + 34 => Header::Field { + name: header::ETAG, + value: HeaderValue::from_static(""), + }, + 35 => Header::Field { + name: header::EXPECT, + value: HeaderValue::from_static(""), + }, + 36 => Header::Field { + name: header::EXPIRES, + value: HeaderValue::from_static(""), + }, + 37 => Header::Field { + name: header::FROM, + value: HeaderValue::from_static(""), + }, + 38 => Header::Field { + name: header::HOST, + value: HeaderValue::from_static(""), + }, + 39 => Header::Field { + name: header::IF_MATCH, + value: HeaderValue::from_static(""), + }, + 40 => Header::Field { + name: header::IF_MODIFIED_SINCE, + value: HeaderValue::from_static(""), + }, + 41 => Header::Field { + name: header::IF_NONE_MATCH, + value: HeaderValue::from_static(""), + }, + 42 => Header::Field { + name: header::IF_RANGE, + value: HeaderValue::from_static(""), + }, + 43 => Header::Field { + name: header::IF_UNMODIFIED_SINCE, + value: HeaderValue::from_static(""), + }, + 44 => Header::Field { + name: header::LAST_MODIFIED, + value: HeaderValue::from_static(""), + }, + 45 => Header::Field { + name: header::LINK, + value: HeaderValue::from_static(""), + }, + 46 => Header::Field { + name: header::LOCATION, + value: HeaderValue::from_static(""), + }, + 47 => Header::Field { + name: header::MAX_FORWARDS, + value: HeaderValue::from_static(""), + }, + 48 => Header::Field { + name: header::PROXY_AUTHENTICATE, + value: HeaderValue::from_static(""), + }, + 49 => Header::Field { + name: header::PROXY_AUTHORIZATION, + value: HeaderValue::from_static(""), + }, + 50 => Header::Field { + name: header::RANGE, + value: HeaderValue::from_static(""), + }, + 51 => Header::Field { + name: header::REFERER, + value: HeaderValue::from_static(""), + }, + 52 => Header::Field { + name: header::REFRESH, + value: HeaderValue::from_static(""), + }, + 53 => Header::Field { + name: header::RETRY_AFTER, + value: HeaderValue::from_static(""), + }, + 54 => Header::Field { + name: header::SERVER, + value: HeaderValue::from_static(""), + }, + 55 => Header::Field { + name: header::SET_COOKIE, + value: HeaderValue::from_static(""), + }, + 56 => Header::Field { + name: header::STRICT_TRANSPORT_SECURITY, + value: HeaderValue::from_static(""), + }, + 57 => Header::Field { + name: header::TRANSFER_ENCODING, + value: HeaderValue::from_static(""), + }, + 58 => Header::Field { + name: header::USER_AGENT, + value: HeaderValue::from_static(""), + }, + 59 => Header::Field { + name: header::VARY, + value: HeaderValue::from_static(""), + }, + 60 => Header::Field { + name: header::VIA, + value: HeaderValue::from_static(""), + }, + 61 => Header::Field { + name: header::WWW_AUTHENTICATE, + value: HeaderValue::from_static(""), + }, + _ => unreachable!(), + } +} + +#[cfg(test)] +mod test { + use super::*; + use crate::hpack::Header; + + #[test] + fn test_peek_u8() { + let b = 0xff; + let mut buf = Cursor::new(vec![b]); + assert_eq!(peek_u8(&mut buf), Some(b)); + assert_eq!(buf.get_u8(), b); + assert_eq!(peek_u8(&mut buf), None); + } + + #[test] + fn test_decode_string_empty() { + let mut de = Decoder::new(0); + let mut buf = BytesMut::new(); + let err = de.decode_string(&mut Cursor::new(&mut buf)).unwrap_err(); + assert_eq!(err, DecoderError::NeedMore(NeedMore::UnexpectedEndOfStream)); + } + + #[test] + fn test_decode_empty() { + let mut de = Decoder::new(0); + let mut buf = BytesMut::new(); + let empty = de.decode(&mut Cursor::new(&mut buf), |_| {}).unwrap(); + assert_eq!(empty, ()); + } + + #[test] + fn test_decode_indexed_larger_than_table() { + let mut de = Decoder::new(0); + + let mut buf = BytesMut::new(); + buf.extend(&[0b01000000, 0x80 | 2]); + buf.extend(huff_encode(b"foo")); + buf.extend(&[0x80 | 3]); + buf.extend(huff_encode(b"bar")); + + let mut res = vec![]; + let _ = de + .decode(&mut Cursor::new(&mut buf), |h| { + res.push(h); + }) + .unwrap(); + + assert_eq!(res.len(), 1); + assert_eq!(de.table.size(), 0); + + match res[0] { + Header::Field { + ref name, + ref value, + } => { + assert_eq!(name, "foo"); + assert_eq!(value, "bar"); + } + _ => panic!(), + } + } + + fn huff_encode(src: &[u8]) -> BytesMut { + let mut buf = BytesMut::new(); + huffman::encode(src, &mut buf); + buf + } + + #[test] + fn test_decode_continuation_header_with_non_huff_encoded_name() { + let mut de = Decoder::new(0); + let value = huff_encode(b"bar"); + let mut buf = BytesMut::new(); + // header name is non_huff encoded + buf.extend(&[0b01000000, 0x00 | 3]); + buf.extend(b"foo"); + // header value is partial + buf.extend(&[0x80 | 3]); + buf.extend(&value[0..1]); + + let mut res = vec![]; + let e = de + .decode(&mut Cursor::new(&mut buf), |h| { + res.push(h); + }) + .unwrap_err(); + // decode error because the header value is partial + assert_eq!(e, DecoderError::NeedMore(NeedMore::StringUnderflow)); + + // extend buf with the remaining header value + buf.extend(&value[1..]); + let _ = de + .decode(&mut Cursor::new(&mut buf), |h| { + res.push(h); + }) + .unwrap(); + + assert_eq!(res.len(), 1); + assert_eq!(de.table.size(), 0); + + match res[0] { + Header::Field { + ref name, + ref value, + } => { + assert_eq!(name, "foo"); + assert_eq!(value, "bar"); + } + _ => panic!(), + } + } +} diff --git a/third_party/rust/h2/src/hpack/encoder.rs b/third_party/rust/h2/src/hpack/encoder.rs new file mode 100644 index 0000000000..76b373830e --- /dev/null +++ b/third_party/rust/h2/src/hpack/encoder.rs @@ -0,0 +1,721 @@ +use super::table::{Index, Table}; +use super::{huffman, Header}; + +use bytes::{BufMut, BytesMut}; +use http::header::{HeaderName, HeaderValue}; + +#[derive(Debug)] +pub struct Encoder { + table: Table, + size_update: Option<SizeUpdate>, +} + +#[derive(Debug, Copy, Clone, Eq, PartialEq)] +enum SizeUpdate { + One(usize), + Two(usize, usize), // min, max +} + +impl Encoder { + pub fn new(max_size: usize, capacity: usize) -> Encoder { + Encoder { + table: Table::new(max_size, capacity), + size_update: None, + } + } + + /// Queues a max size update. + /// + /// The next call to `encode` will include a dynamic size update frame. + pub fn update_max_size(&mut self, val: usize) { + match self.size_update { + Some(SizeUpdate::One(old)) => { + if val > old { + if old > self.table.max_size() { + self.size_update = Some(SizeUpdate::One(val)); + } else { + self.size_update = Some(SizeUpdate::Two(old, val)); + } + } else { + self.size_update = Some(SizeUpdate::One(val)); + } + } + Some(SizeUpdate::Two(min, _)) => { + if val < min { + self.size_update = Some(SizeUpdate::One(val)); + } else { + self.size_update = Some(SizeUpdate::Two(min, val)); + } + } + None => { + if val != self.table.max_size() { + // Don't bother writing a frame if the value already matches + // the table's max size. + self.size_update = Some(SizeUpdate::One(val)); + } + } + } + } + + /// Encode a set of headers into the provide buffer + pub fn encode<I>(&mut self, headers: I, dst: &mut BytesMut) + where + I: IntoIterator<Item = Header<Option<HeaderName>>>, + { + let span = tracing::trace_span!("hpack::encode"); + let _e = span.enter(); + + self.encode_size_updates(dst); + + let mut last_index = None; + + for header in headers { + match header.reify() { + // The header has an associated name. In which case, try to + // index it in the table. + Ok(header) => { + let index = self.table.index(header); + self.encode_header(&index, dst); + + last_index = Some(index); + } + // The header does not have an associated name. This means that + // the name is the same as the previously yielded header. In + // which case, we skip table lookup and just use the same index + // as the previous entry. + Err(value) => { + self.encode_header_without_name( + last_index.as_ref().unwrap_or_else(|| { + panic!("encoding header without name, but no previous index to use for name"); + }), + &value, + dst, + ); + } + } + } + } + + fn encode_size_updates(&mut self, dst: &mut BytesMut) { + match self.size_update.take() { + Some(SizeUpdate::One(val)) => { + self.table.resize(val); + encode_size_update(val, dst); + } + Some(SizeUpdate::Two(min, max)) => { + self.table.resize(min); + self.table.resize(max); + encode_size_update(min, dst); + encode_size_update(max, dst); + } + None => {} + } + } + + fn encode_header(&mut self, index: &Index, dst: &mut BytesMut) { + match *index { + Index::Indexed(idx, _) => { + encode_int(idx, 7, 0x80, dst); + } + Index::Name(idx, _) => { + let header = self.table.resolve(&index); + + encode_not_indexed(idx, header.value_slice(), header.is_sensitive(), dst); + } + Index::Inserted(_) => { + let header = self.table.resolve(&index); + + assert!(!header.is_sensitive()); + + dst.put_u8(0b0100_0000); + + encode_str(header.name().as_slice(), dst); + encode_str(header.value_slice(), dst); + } + Index::InsertedValue(idx, _) => { + let header = self.table.resolve(&index); + + assert!(!header.is_sensitive()); + + encode_int(idx, 6, 0b0100_0000, dst); + encode_str(header.value_slice(), dst); + } + Index::NotIndexed(_) => { + let header = self.table.resolve(&index); + + encode_not_indexed2( + header.name().as_slice(), + header.value_slice(), + header.is_sensitive(), + dst, + ); + } + } + } + + fn encode_header_without_name( + &mut self, + last: &Index, + value: &HeaderValue, + dst: &mut BytesMut, + ) { + match *last { + Index::Indexed(..) + | Index::Name(..) + | Index::Inserted(..) + | Index::InsertedValue(..) => { + let idx = self.table.resolve_idx(last); + + encode_not_indexed(idx, value.as_ref(), value.is_sensitive(), dst); + } + Index::NotIndexed(_) => { + let last = self.table.resolve(last); + + encode_not_indexed2( + last.name().as_slice(), + value.as_ref(), + value.is_sensitive(), + dst, + ); + } + } + } +} + +impl Default for Encoder { + fn default() -> Encoder { + Encoder::new(4096, 0) + } +} + +fn encode_size_update(val: usize, dst: &mut BytesMut) { + encode_int(val, 5, 0b0010_0000, dst) +} + +fn encode_not_indexed(name: usize, value: &[u8], sensitive: bool, dst: &mut BytesMut) { + if sensitive { + encode_int(name, 4, 0b10000, dst); + } else { + encode_int(name, 4, 0, dst); + } + + encode_str(value, dst); +} + +fn encode_not_indexed2(name: &[u8], value: &[u8], sensitive: bool, dst: &mut BytesMut) { + if sensitive { + dst.put_u8(0b10000); + } else { + dst.put_u8(0); + } + + encode_str(name, dst); + encode_str(value, dst); +} + +fn encode_str(val: &[u8], dst: &mut BytesMut) { + if !val.is_empty() { + let idx = position(dst); + + // Push a placeholder byte for the length header + dst.put_u8(0); + + // Encode with huffman + huffman::encode(val, dst); + + let huff_len = position(dst) - (idx + 1); + + if encode_int_one_byte(huff_len, 7) { + // Write the string head + dst[idx] = 0x80 | huff_len as u8; + } else { + // Write the head to a placeholder + const PLACEHOLDER_LEN: usize = 8; + let mut buf = [0u8; PLACEHOLDER_LEN]; + + let head_len = { + let mut head_dst = &mut buf[..]; + encode_int(huff_len, 7, 0x80, &mut head_dst); + PLACEHOLDER_LEN - head_dst.remaining_mut() + }; + + // This is just done to reserve space in the destination + dst.put_slice(&buf[1..head_len]); + + // Shift the header forward + for i in 0..huff_len { + let src_i = idx + 1 + (huff_len - (i + 1)); + let dst_i = idx + head_len + (huff_len - (i + 1)); + dst[dst_i] = dst[src_i]; + } + + // Copy in the head + for i in 0..head_len { + dst[idx + i] = buf[i]; + } + } + } else { + // Write an empty string + dst.put_u8(0); + } +} + +/// Encode an integer into the given destination buffer +fn encode_int<B: BufMut>( + mut value: usize, // The integer to encode + prefix_bits: usize, // The number of bits in the prefix + first_byte: u8, // The base upon which to start encoding the int + dst: &mut B, +) { + if encode_int_one_byte(value, prefix_bits) { + dst.put_u8(first_byte | value as u8); + return; + } + + let low = (1 << prefix_bits) - 1; + + value -= low; + + dst.put_u8(first_byte | low as u8); + + while value >= 128 { + dst.put_u8(0b1000_0000 | value as u8); + + value >>= 7; + } + + dst.put_u8(value as u8); +} + +/// Returns true if the in the int can be fully encoded in the first byte. +fn encode_int_one_byte(value: usize, prefix_bits: usize) -> bool { + value < (1 << prefix_bits) - 1 +} + +fn position(buf: &BytesMut) -> usize { + buf.len() +} + +#[cfg(test)] +mod test { + use super::*; + use crate::hpack::Header; + use http::*; + + #[test] + fn test_encode_method_get() { + let mut encoder = Encoder::default(); + let res = encode(&mut encoder, vec![method("GET")]); + assert_eq!(*res, [0x80 | 2]); + assert_eq!(encoder.table.len(), 0); + } + + #[test] + fn test_encode_method_post() { + let mut encoder = Encoder::default(); + let res = encode(&mut encoder, vec![method("POST")]); + assert_eq!(*res, [0x80 | 3]); + assert_eq!(encoder.table.len(), 0); + } + + #[test] + fn test_encode_method_patch() { + let mut encoder = Encoder::default(); + let res = encode(&mut encoder, vec![method("PATCH")]); + + assert_eq!(res[0], 0b01000000 | 2); // Incremental indexing w/ name pulled from table + assert_eq!(res[1], 0x80 | 5); // header value w/ huffman coding + + assert_eq!("PATCH", huff_decode(&res[2..7])); + assert_eq!(encoder.table.len(), 1); + + let res = encode(&mut encoder, vec![method("PATCH")]); + + assert_eq!(1 << 7 | 62, res[0]); + assert_eq!(1, res.len()); + } + + #[test] + fn test_encode_indexed_name_literal_value() { + let mut encoder = Encoder::default(); + let res = encode(&mut encoder, vec![header("content-language", "foo")]); + + assert_eq!(res[0], 0b01000000 | 27); // Indexed name + assert_eq!(res[1], 0x80 | 2); // header value w/ huffman coding + + assert_eq!("foo", huff_decode(&res[2..4])); + + // Same name, new value should still use incremental + let res = encode(&mut encoder, vec![header("content-language", "bar")]); + assert_eq!(res[0], 0b01000000 | 27); // Indexed name + assert_eq!(res[1], 0x80 | 3); // header value w/ huffman coding + assert_eq!("bar", huff_decode(&res[2..5])); + } + + #[test] + fn test_repeated_headers_are_indexed() { + let mut encoder = Encoder::default(); + let res = encode(&mut encoder, vec![header("foo", "hello")]); + + assert_eq!(&[0b01000000, 0x80 | 2], &res[0..2]); + assert_eq!("foo", huff_decode(&res[2..4])); + assert_eq!(0x80 | 4, res[4]); + assert_eq!("hello", huff_decode(&res[5..])); + assert_eq!(9, res.len()); + + assert_eq!(1, encoder.table.len()); + + let res = encode(&mut encoder, vec![header("foo", "hello")]); + assert_eq!([0x80 | 62], *res); + + assert_eq!(encoder.table.len(), 1); + } + + #[test] + fn test_evicting_headers() { + let mut encoder = Encoder::default(); + + // Fill the table + for i in 0..64 { + let key = format!("x-hello-world-{:02}", i); + let res = encode(&mut encoder, vec![header(&key, &key)]); + + assert_eq!(&[0b01000000, 0x80 | 12], &res[0..2]); + assert_eq!(key, huff_decode(&res[2..14])); + assert_eq!(0x80 | 12, res[14]); + assert_eq!(key, huff_decode(&res[15..])); + assert_eq!(27, res.len()); + + // Make sure the header can be found... + let res = encode(&mut encoder, vec![header(&key, &key)]); + + // Only check that it is found + assert_eq!(0x80, res[0] & 0x80); + } + + assert_eq!(4096, encoder.table.size()); + assert_eq!(64, encoder.table.len()); + + // Find existing headers + for i in 0..64 { + let key = format!("x-hello-world-{:02}", i); + let res = encode(&mut encoder, vec![header(&key, &key)]); + assert_eq!(0x80, res[0] & 0x80); + } + + // Insert a new header + let key = "x-hello-world-64"; + let res = encode(&mut encoder, vec![header(key, key)]); + + assert_eq!(&[0b01000000, 0x80 | 12], &res[0..2]); + assert_eq!(key, huff_decode(&res[2..14])); + assert_eq!(0x80 | 12, res[14]); + assert_eq!(key, huff_decode(&res[15..])); + assert_eq!(27, res.len()); + + assert_eq!(64, encoder.table.len()); + + // Now try encoding entries that should exist in the table + for i in 1..65 { + let key = format!("x-hello-world-{:02}", i); + let res = encode(&mut encoder, vec![header(&key, &key)]); + assert_eq!(0x80 | (61 + (65 - i)), res[0]); + } + } + + #[test] + fn test_large_headers_are_not_indexed() { + let mut encoder = Encoder::new(128, 0); + let key = "hello-world-hello-world-HELLO-zzz"; + + let res = encode(&mut encoder, vec![header(key, key)]); + + assert_eq!(&[0, 0x80 | 25], &res[..2]); + + assert_eq!(0, encoder.table.len()); + assert_eq!(0, encoder.table.size()); + } + + #[test] + fn test_sensitive_headers_are_never_indexed() { + use http::header::HeaderValue; + + let name = "my-password".parse().unwrap(); + let mut value = HeaderValue::from_bytes(b"12345").unwrap(); + value.set_sensitive(true); + + let header = Header::Field { + name: Some(name), + value, + }; + + // Now, try to encode the sensitive header + + let mut encoder = Encoder::default(); + let res = encode(&mut encoder, vec![header]); + + assert_eq!(&[0b10000, 0x80 | 8], &res[..2]); + assert_eq!("my-password", huff_decode(&res[2..10])); + assert_eq!(0x80 | 4, res[10]); + assert_eq!("12345", huff_decode(&res[11..])); + + // Now, try to encode a sensitive header w/ a name in the static table + let name = "authorization".parse().unwrap(); + let mut value = HeaderValue::from_bytes(b"12345").unwrap(); + value.set_sensitive(true); + + let header = Header::Field { + name: Some(name), + value, + }; + + let mut encoder = Encoder::default(); + let res = encode(&mut encoder, vec![header]); + + assert_eq!(&[0b11111, 8], &res[..2]); + assert_eq!(0x80 | 4, res[2]); + assert_eq!("12345", huff_decode(&res[3..])); + + // Using the name component of a previously indexed header (without + // sensitive flag set) + + let _ = encode( + &mut encoder, + vec![self::header("my-password", "not-so-secret")], + ); + + let name = "my-password".parse().unwrap(); + let mut value = HeaderValue::from_bytes(b"12345").unwrap(); + value.set_sensitive(true); + + let header = Header::Field { + name: Some(name), + value, + }; + let res = encode(&mut encoder, vec![header]); + + assert_eq!(&[0b11111, 47], &res[..2]); + assert_eq!(0x80 | 4, res[2]); + assert_eq!("12345", huff_decode(&res[3..])); + } + + #[test] + fn test_content_length_value_not_indexed() { + let mut encoder = Encoder::default(); + let res = encode(&mut encoder, vec![header("content-length", "1234")]); + + assert_eq!(&[15, 13, 0x80 | 3], &res[0..3]); + assert_eq!("1234", huff_decode(&res[3..])); + assert_eq!(6, res.len()); + } + + #[test] + fn test_encoding_headers_with_same_name() { + let mut encoder = Encoder::default(); + let name = "hello"; + + // Encode first one + let _ = encode(&mut encoder, vec![header(name, "one")]); + + // Encode second one + let res = encode(&mut encoder, vec![header(name, "two")]); + assert_eq!(&[0x40 | 62, 0x80 | 3], &res[0..2]); + assert_eq!("two", huff_decode(&res[2..])); + assert_eq!(5, res.len()); + + // Encode the first one again + let res = encode(&mut encoder, vec![header(name, "one")]); + assert_eq!(&[0x80 | 63], &res[..]); + + // Now the second one + let res = encode(&mut encoder, vec![header(name, "two")]); + assert_eq!(&[0x80 | 62], &res[..]); + } + + #[test] + fn test_evicting_headers_when_multiple_of_same_name_are_in_table() { + // The encoder only has space for 2 headers + let mut encoder = Encoder::new(76, 0); + + let _ = encode(&mut encoder, vec![header("foo", "bar")]); + assert_eq!(1, encoder.table.len()); + + let _ = encode(&mut encoder, vec![header("bar", "foo")]); + assert_eq!(2, encoder.table.len()); + + // This will evict the first header, while still referencing the header + // name + let res = encode(&mut encoder, vec![header("foo", "baz")]); + assert_eq!(&[0x40 | 63, 0, 0x80 | 3], &res[..3]); + assert_eq!(2, encoder.table.len()); + + // Try adding the same header again + let res = encode(&mut encoder, vec![header("foo", "baz")]); + assert_eq!(&[0x80 | 62], &res[..]); + assert_eq!(2, encoder.table.len()); + } + + #[test] + fn test_max_size_zero() { + // Static table only + let mut encoder = Encoder::new(0, 0); + let res = encode(&mut encoder, vec![method("GET")]); + assert_eq!(*res, [0x80 | 2]); + assert_eq!(encoder.table.len(), 0); + + let res = encode(&mut encoder, vec![header("foo", "bar")]); + assert_eq!(&[0, 0x80 | 2], &res[..2]); + assert_eq!("foo", huff_decode(&res[2..4])); + assert_eq!(0x80 | 3, res[4]); + assert_eq!("bar", huff_decode(&res[5..8])); + assert_eq!(0, encoder.table.len()); + + // Encode a custom value + let res = encode(&mut encoder, vec![header("transfer-encoding", "chunked")]); + assert_eq!(&[15, 42, 0x80 | 6], &res[..3]); + assert_eq!("chunked", huff_decode(&res[3..])); + } + + #[test] + fn test_update_max_size_combos() { + let mut encoder = Encoder::default(); + assert!(encoder.size_update.is_none()); + assert_eq!(4096, encoder.table.max_size()); + + encoder.update_max_size(4096); // Default size + assert!(encoder.size_update.is_none()); + + encoder.update_max_size(0); + assert_eq!(Some(SizeUpdate::One(0)), encoder.size_update); + + encoder.update_max_size(100); + assert_eq!(Some(SizeUpdate::Two(0, 100)), encoder.size_update); + + let mut encoder = Encoder::default(); + encoder.update_max_size(8000); + assert_eq!(Some(SizeUpdate::One(8000)), encoder.size_update); + + encoder.update_max_size(100); + assert_eq!(Some(SizeUpdate::One(100)), encoder.size_update); + + encoder.update_max_size(8000); + assert_eq!(Some(SizeUpdate::Two(100, 8000)), encoder.size_update); + + encoder.update_max_size(4000); + assert_eq!(Some(SizeUpdate::Two(100, 4000)), encoder.size_update); + + encoder.update_max_size(50); + assert_eq!(Some(SizeUpdate::One(50)), encoder.size_update); + } + + #[test] + fn test_resizing_table() { + let mut encoder = Encoder::default(); + + // Add a header + let _ = encode(&mut encoder, vec![header("foo", "bar")]); + + encoder.update_max_size(1); + assert_eq!(1, encoder.table.len()); + + let res = encode(&mut encoder, vec![method("GET")]); + assert_eq!(&[32 | 1, 0x80 | 2], &res[..]); + assert_eq!(0, encoder.table.len()); + + let res = encode(&mut encoder, vec![header("foo", "bar")]); + assert_eq!(0, res[0]); + + encoder.update_max_size(100); + let res = encode(&mut encoder, vec![header("foo", "bar")]); + assert_eq!(&[32 | 31, 69, 64], &res[..3]); + + encoder.update_max_size(0); + let res = encode(&mut encoder, vec![header("foo", "bar")]); + assert_eq!(&[32, 0], &res[..2]); + } + + #[test] + fn test_decreasing_table_size_without_eviction() { + let mut encoder = Encoder::default(); + + // Add a header + let _ = encode(&mut encoder, vec![header("foo", "bar")]); + + encoder.update_max_size(100); + assert_eq!(1, encoder.table.len()); + + let res = encode(&mut encoder, vec![header("foo", "bar")]); + assert_eq!(&[32 | 31, 69, 0x80 | 62], &res[..]); + } + + #[test] + fn test_nameless_header() { + let mut encoder = Encoder::default(); + + let res = encode( + &mut encoder, + vec![ + Header::Field { + name: Some("hello".parse().unwrap()), + value: HeaderValue::from_bytes(b"world").unwrap(), + }, + Header::Field { + name: None, + value: HeaderValue::from_bytes(b"zomg").unwrap(), + }, + ], + ); + + assert_eq!(&[0x40, 0x80 | 4], &res[0..2]); + assert_eq!("hello", huff_decode(&res[2..6])); + assert_eq!(0x80 | 4, res[6]); + assert_eq!("world", huff_decode(&res[7..11])); + + // Next is not indexed + assert_eq!(&[15, 47, 0x80 | 3], &res[11..14]); + assert_eq!("zomg", huff_decode(&res[14..])); + } + + #[test] + fn test_large_size_update() { + let mut encoder = Encoder::default(); + + encoder.update_max_size(1912930560); + assert_eq!(Some(SizeUpdate::One(1912930560)), encoder.size_update); + + let mut dst = BytesMut::with_capacity(6); + encoder.encode_size_updates(&mut dst); + assert_eq!([63, 225, 129, 148, 144, 7], &dst[..]); + } + + #[test] + #[ignore] + fn test_evicted_overflow() { + // Not sure what the best way to do this is. + } + + fn encode(e: &mut Encoder, hdrs: Vec<Header<Option<HeaderName>>>) -> BytesMut { + let mut dst = BytesMut::with_capacity(1024); + e.encode(&mut hdrs.into_iter(), &mut dst); + dst + } + + fn method(s: &str) -> Header<Option<HeaderName>> { + Header::Method(Method::from_bytes(s.as_bytes()).unwrap()) + } + + fn header(name: &str, val: &str) -> Header<Option<HeaderName>> { + let name = HeaderName::from_bytes(name.as_bytes()).unwrap(); + let value = HeaderValue::from_bytes(val.as_bytes()).unwrap(); + + Header::Field { + name: Some(name), + value, + } + } + + fn huff_decode(src: &[u8]) -> BytesMut { + let mut buf = BytesMut::new(); + huffman::decode(src, &mut buf).unwrap() + } +} diff --git a/third_party/rust/h2/src/hpack/header.rs b/third_party/rust/h2/src/hpack/header.rs new file mode 100644 index 0000000000..e6df555abf --- /dev/null +++ b/third_party/rust/h2/src/hpack/header.rs @@ -0,0 +1,308 @@ +use super::{DecoderError, NeedMore}; +use crate::ext::Protocol; + +use bytes::Bytes; +use http::header::{HeaderName, HeaderValue}; +use http::{Method, StatusCode}; +use std::fmt; + +/// HTTP/2 Header +#[derive(Debug, Clone, Eq, PartialEq)] +pub enum Header<T = HeaderName> { + Field { name: T, value: HeaderValue }, + // TODO: Change these types to `http::uri` types. + Authority(BytesStr), + Method(Method), + Scheme(BytesStr), + Path(BytesStr), + Protocol(Protocol), + Status(StatusCode), +} + +/// The header field name +#[derive(Debug, Clone, Eq, PartialEq, Hash)] +pub enum Name<'a> { + Field(&'a HeaderName), + Authority, + Method, + Scheme, + Path, + Protocol, + Status, +} + +#[doc(hidden)] +#[derive(Clone, Eq, PartialEq, Default)] +pub struct BytesStr(Bytes); + +pub fn len(name: &HeaderName, value: &HeaderValue) -> usize { + let n: &str = name.as_ref(); + 32 + n.len() + value.len() +} + +impl Header<Option<HeaderName>> { + pub fn reify(self) -> Result<Header, HeaderValue> { + use self::Header::*; + + Ok(match self { + Field { + name: Some(n), + value, + } => Field { name: n, value }, + Field { name: None, value } => return Err(value), + Authority(v) => Authority(v), + Method(v) => Method(v), + Scheme(v) => Scheme(v), + Path(v) => Path(v), + Protocol(v) => Protocol(v), + Status(v) => Status(v), + }) + } +} + +impl Header { + pub fn new(name: Bytes, value: Bytes) -> Result<Header, DecoderError> { + if name.is_empty() { + return Err(DecoderError::NeedMore(NeedMore::UnexpectedEndOfStream)); + } + if name[0] == b':' { + match &name[1..] { + b"authority" => { + let value = BytesStr::try_from(value)?; + Ok(Header::Authority(value)) + } + b"method" => { + let method = Method::from_bytes(&value)?; + Ok(Header::Method(method)) + } + b"scheme" => { + let value = BytesStr::try_from(value)?; + Ok(Header::Scheme(value)) + } + b"path" => { + let value = BytesStr::try_from(value)?; + Ok(Header::Path(value)) + } + b"protocol" => { + let value = Protocol::try_from(value)?; + Ok(Header::Protocol(value)) + } + b"status" => { + let status = StatusCode::from_bytes(&value)?; + Ok(Header::Status(status)) + } + _ => Err(DecoderError::InvalidPseudoheader), + } + } else { + // HTTP/2 requires lower case header names + let name = HeaderName::from_lowercase(&name)?; + let value = HeaderValue::from_bytes(&value)?; + + Ok(Header::Field { name, value }) + } + } + + pub fn len(&self) -> usize { + match *self { + Header::Field { + ref name, + ref value, + } => len(name, value), + Header::Authority(ref v) => 32 + 10 + v.len(), + Header::Method(ref v) => 32 + 7 + v.as_ref().len(), + Header::Scheme(ref v) => 32 + 7 + v.len(), + Header::Path(ref v) => 32 + 5 + v.len(), + Header::Protocol(ref v) => 32 + 9 + v.as_str().len(), + Header::Status(_) => 32 + 7 + 3, + } + } + + /// Returns the header name + pub fn name(&self) -> Name { + match *self { + Header::Field { ref name, .. } => Name::Field(name), + Header::Authority(..) => Name::Authority, + Header::Method(..) => Name::Method, + Header::Scheme(..) => Name::Scheme, + Header::Path(..) => Name::Path, + Header::Protocol(..) => Name::Protocol, + Header::Status(..) => Name::Status, + } + } + + pub fn value_slice(&self) -> &[u8] { + match *self { + Header::Field { ref value, .. } => value.as_ref(), + Header::Authority(ref v) => v.as_ref(), + Header::Method(ref v) => v.as_ref().as_ref(), + Header::Scheme(ref v) => v.as_ref(), + Header::Path(ref v) => v.as_ref(), + Header::Protocol(ref v) => v.as_ref(), + Header::Status(ref v) => v.as_str().as_ref(), + } + } + + pub fn value_eq(&self, other: &Header) -> bool { + match *self { + Header::Field { ref value, .. } => { + let a = value; + match *other { + Header::Field { ref value, .. } => a == value, + _ => false, + } + } + Header::Authority(ref a) => match *other { + Header::Authority(ref b) => a == b, + _ => false, + }, + Header::Method(ref a) => match *other { + Header::Method(ref b) => a == b, + _ => false, + }, + Header::Scheme(ref a) => match *other { + Header::Scheme(ref b) => a == b, + _ => false, + }, + Header::Path(ref a) => match *other { + Header::Path(ref b) => a == b, + _ => false, + }, + Header::Protocol(ref a) => match *other { + Header::Protocol(ref b) => a == b, + _ => false, + }, + Header::Status(ref a) => match *other { + Header::Status(ref b) => a == b, + _ => false, + }, + } + } + + pub fn is_sensitive(&self) -> bool { + match *self { + Header::Field { ref value, .. } => value.is_sensitive(), + // TODO: Technically these other header values can be sensitive too. + _ => false, + } + } + + pub fn skip_value_index(&self) -> bool { + use http::header; + + match *self { + Header::Field { ref name, .. } => match *name { + header::AGE + | header::AUTHORIZATION + | header::CONTENT_LENGTH + | header::ETAG + | header::IF_MODIFIED_SINCE + | header::IF_NONE_MATCH + | header::LOCATION + | header::COOKIE + | header::SET_COOKIE => true, + _ => false, + }, + Header::Path(..) => true, + _ => false, + } + } +} + +// Mostly for tests +impl From<Header> for Header<Option<HeaderName>> { + fn from(src: Header) -> Self { + match src { + Header::Field { name, value } => Header::Field { + name: Some(name), + value, + }, + Header::Authority(v) => Header::Authority(v), + Header::Method(v) => Header::Method(v), + Header::Scheme(v) => Header::Scheme(v), + Header::Path(v) => Header::Path(v), + Header::Protocol(v) => Header::Protocol(v), + Header::Status(v) => Header::Status(v), + } + } +} + +impl<'a> Name<'a> { + pub fn into_entry(self, value: Bytes) -> Result<Header, DecoderError> { + match self { + Name::Field(name) => Ok(Header::Field { + name: name.clone(), + value: HeaderValue::from_bytes(&*value)?, + }), + Name::Authority => Ok(Header::Authority(BytesStr::try_from(value)?)), + Name::Method => Ok(Header::Method(Method::from_bytes(&*value)?)), + Name::Scheme => Ok(Header::Scheme(BytesStr::try_from(value)?)), + Name::Path => Ok(Header::Path(BytesStr::try_from(value)?)), + Name::Protocol => Ok(Header::Protocol(Protocol::try_from(value)?)), + Name::Status => { + match StatusCode::from_bytes(&value) { + Ok(status) => Ok(Header::Status(status)), + // TODO: better error handling + Err(_) => Err(DecoderError::InvalidStatusCode), + } + } + } + } + + pub fn as_slice(&self) -> &[u8] { + match *self { + Name::Field(ref name) => name.as_ref(), + Name::Authority => b":authority", + Name::Method => b":method", + Name::Scheme => b":scheme", + Name::Path => b":path", + Name::Protocol => b":protocol", + Name::Status => b":status", + } + } +} + +// ===== impl BytesStr ===== + +impl BytesStr { + pub(crate) const fn from_static(value: &'static str) -> Self { + BytesStr(Bytes::from_static(value.as_bytes())) + } + + pub(crate) fn from(value: &str) -> Self { + BytesStr(Bytes::copy_from_slice(value.as_bytes())) + } + + #[doc(hidden)] + pub fn try_from(bytes: Bytes) -> Result<Self, std::str::Utf8Error> { + std::str::from_utf8(bytes.as_ref())?; + Ok(BytesStr(bytes)) + } + + pub(crate) fn as_str(&self) -> &str { + // Safety: check valid utf-8 in constructor + unsafe { std::str::from_utf8_unchecked(self.0.as_ref()) } + } + + pub(crate) fn into_inner(self) -> Bytes { + self.0 + } +} + +impl std::ops::Deref for BytesStr { + type Target = str; + fn deref(&self) -> &str { + self.as_str() + } +} + +impl AsRef<[u8]> for BytesStr { + fn as_ref(&self) -> &[u8] { + self.0.as_ref() + } +} + +impl fmt::Debug for BytesStr { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + self.0.fmt(f) + } +} diff --git a/third_party/rust/h2/src/hpack/huffman/mod.rs b/third_party/rust/h2/src/hpack/huffman/mod.rs new file mode 100644 index 0000000000..07b3fd925b --- /dev/null +++ b/third_party/rust/h2/src/hpack/huffman/mod.rs @@ -0,0 +1,200 @@ +mod table; + +use self::table::{DECODE_TABLE, ENCODE_TABLE}; +use crate::hpack::DecoderError; + +use bytes::{BufMut, BytesMut}; + +// Constructed in the generated `table.rs` file +struct Decoder { + state: usize, + maybe_eos: bool, +} + +// These flags must match the ones in genhuff.rs + +const MAYBE_EOS: u8 = 1; +const DECODED: u8 = 2; +const ERROR: u8 = 4; + +pub fn decode(src: &[u8], buf: &mut BytesMut) -> Result<BytesMut, DecoderError> { + let mut decoder = Decoder::new(); + + // Max compression ratio is >= 0.5 + buf.reserve(src.len() << 1); + + for b in src { + if let Some(b) = decoder.decode4(b >> 4)? { + buf.put_u8(b); + } + + if let Some(b) = decoder.decode4(b & 0xf)? { + buf.put_u8(b); + } + } + + if !decoder.is_final() { + return Err(DecoderError::InvalidHuffmanCode); + } + + Ok(buf.split()) +} + +pub fn encode(src: &[u8], dst: &mut BytesMut) { + let mut bits: u64 = 0; + let mut bits_left = 40; + + for &b in src { + let (nbits, code) = ENCODE_TABLE[b as usize]; + + bits |= code << (bits_left - nbits); + bits_left -= nbits; + + while bits_left <= 32 { + dst.put_u8((bits >> 32) as u8); + + bits <<= 8; + bits_left += 8; + } + } + + if bits_left != 40 { + // This writes the EOS token + bits |= (1 << bits_left) - 1; + dst.put_u8((bits >> 32) as u8); + } +} + +impl Decoder { + fn new() -> Decoder { + Decoder { + state: 0, + maybe_eos: false, + } + } + + // Decodes 4 bits + fn decode4(&mut self, input: u8) -> Result<Option<u8>, DecoderError> { + // (next-state, byte, flags) + let (next, byte, flags) = DECODE_TABLE[self.state][input as usize]; + + if flags & ERROR == ERROR { + // Data followed the EOS marker + return Err(DecoderError::InvalidHuffmanCode); + } + + let mut ret = None; + + if flags & DECODED == DECODED { + ret = Some(byte); + } + + self.state = next; + self.maybe_eos = flags & MAYBE_EOS == MAYBE_EOS; + + Ok(ret) + } + + fn is_final(&self) -> bool { + self.state == 0 || self.maybe_eos + } +} + +#[cfg(test)] +mod test { + use super::*; + + fn decode(src: &[u8]) -> Result<BytesMut, DecoderError> { + let mut buf = BytesMut::new(); + super::decode(src, &mut buf) + } + + #[test] + fn decode_single_byte() { + assert_eq!("o", decode(&[0b00111111]).unwrap()); + assert_eq!("0", decode(&[0x0 + 7]).unwrap()); + assert_eq!("A", decode(&[(0x21 << 2) + 3]).unwrap()); + } + + #[test] + fn single_char_multi_byte() { + assert_eq!("#", decode(&[255, 160 + 15]).unwrap()); + assert_eq!("$", decode(&[255, 200 + 7]).unwrap()); + assert_eq!("\x0a", decode(&[255, 255, 255, 240 + 3]).unwrap()); + } + + #[test] + fn multi_char() { + assert_eq!("!0", decode(&[254, 1]).unwrap()); + assert_eq!(" !", decode(&[0b01010011, 0b11111000]).unwrap()); + } + + #[test] + fn encode_single_byte() { + let mut dst = BytesMut::with_capacity(1); + + encode(b"o", &mut dst); + assert_eq!(&dst[..], &[0b00111111]); + + dst.clear(); + encode(b"0", &mut dst); + assert_eq!(&dst[..], &[0x0 + 7]); + + dst.clear(); + encode(b"A", &mut dst); + assert_eq!(&dst[..], &[(0x21 << 2) + 3]); + } + + #[test] + fn encode_decode_str() { + const DATA: &'static [&'static str] = &[ + "hello world", + ":method", + ":scheme", + ":authority", + "yahoo.co.jp", + "GET", + "http", + ":path", + "/images/top/sp2/cmn/logo-ns-130528.png", + "example.com", + "hpack-test", + "xxxxxxx1", + "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:16.0) Gecko/20100101 Firefox/16.0", + "accept", + "Accept", + "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", + "cookie", + "B=76j09a189a6h4&b=3&s=0b", + "TE", + "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi non bibendum libero. \ + Etiam ultrices lorem ut.", + ]; + + for s in DATA { + let mut dst = BytesMut::with_capacity(s.len()); + + encode(s.as_bytes(), &mut dst); + + let decoded = decode(&dst).unwrap(); + + assert_eq!(&decoded[..], s.as_bytes()); + } + } + + #[test] + fn encode_decode_u8() { + const DATA: &'static [&'static [u8]] = + &[b"\0", b"\0\0\0", b"\0\x01\x02\x03\x04\x05", b"\xFF\xF8"]; + + for s in DATA { + let mut dst = BytesMut::with_capacity(s.len()); + + encode(s, &mut dst); + + let decoded = decode(&dst).unwrap(); + + assert_eq!(&decoded[..], &s[..]); + } + } +} diff --git a/third_party/rust/h2/src/hpack/huffman/table.rs b/third_party/rust/h2/src/hpack/huffman/table.rs new file mode 100644 index 0000000000..560cfaf7be --- /dev/null +++ b/third_party/rust/h2/src/hpack/huffman/table.rs @@ -0,0 +1,5130 @@ +// !!! DO NOT EDIT !!! Generated by util/genhuff/src/main.rs + +// (num-bits, bits) +pub const ENCODE_TABLE: [(usize, u64); 257] = [ + (13, 0x1ff8), + (23, 0x007f_ffd8), + (28, 0x0fff_ffe2), + (28, 0x0fff_ffe3), + (28, 0x0fff_ffe4), + (28, 0x0fff_ffe5), + (28, 0x0fff_ffe6), + (28, 0x0fff_ffe7), + (28, 0x0fff_ffe8), + (24, 0x00ff_ffea), + (30, 0x3fff_fffc), + (28, 0x0fff_ffe9), + (28, 0x0fff_ffea), + (30, 0x3fff_fffd), + (28, 0x0fff_ffeb), + (28, 0x0fff_ffec), + (28, 0x0fff_ffed), + (28, 0x0fff_ffee), + (28, 0x0fff_ffef), + (28, 0x0fff_fff0), + (28, 0x0fff_fff1), + (28, 0x0fff_fff2), + (30, 0x3fff_fffe), + (28, 0x0fff_fff3), + (28, 0x0fff_fff4), + (28, 0x0fff_fff5), + (28, 0x0fff_fff6), + (28, 0x0fff_fff7), + (28, 0x0fff_fff8), + (28, 0x0fff_fff9), + (28, 0x0fff_fffa), + (28, 0x0fff_fffb), + (6, 0x14), + (10, 0x3f8), + (10, 0x3f9), + (12, 0xffa), + (13, 0x1ff9), + (6, 0x15), + (8, 0xf8), + (11, 0x7fa), + (10, 0x3fa), + (10, 0x3fb), + (8, 0xf9), + (11, 0x7fb), + (8, 0xfa), + (6, 0x16), + (6, 0x17), + (6, 0x18), + (5, 0x0), + (5, 0x1), + (5, 0x2), + (6, 0x19), + (6, 0x1a), + (6, 0x1b), + (6, 0x1c), + (6, 0x1d), + (6, 0x1e), + (6, 0x1f), + (7, 0x5c), + (8, 0xfb), + (15, 0x7ffc), + (6, 0x20), + (12, 0xffb), + (10, 0x3fc), + (13, 0x1ffa), + (6, 0x21), + (7, 0x5d), + (7, 0x5e), + (7, 0x5f), + (7, 0x60), + (7, 0x61), + (7, 0x62), + (7, 0x63), + (7, 0x64), + (7, 0x65), + (7, 0x66), + (7, 0x67), + (7, 0x68), + (7, 0x69), + (7, 0x6a), + (7, 0x6b), + (7, 0x6c), + (7, 0x6d), + (7, 0x6e), + (7, 0x6f), + (7, 0x70), + (7, 0x71), + (7, 0x72), + (8, 0xfc), + (7, 0x73), + (8, 0xfd), + (13, 0x1ffb), + (19, 0x7fff0), + (13, 0x1ffc), + (14, 0x3ffc), + (6, 0x22), + (15, 0x7ffd), + (5, 0x3), + (6, 0x23), + (5, 0x4), + (6, 0x24), + (5, 0x5), + (6, 0x25), + (6, 0x26), + (6, 0x27), + (5, 0x6), + (7, 0x74), + (7, 0x75), + (6, 0x28), + (6, 0x29), + (6, 0x2a), + (5, 0x7), + (6, 0x2b), + (7, 0x76), + (6, 0x2c), + (5, 0x8), + (5, 0x9), + (6, 0x2d), + (7, 0x77), + (7, 0x78), + (7, 0x79), + (7, 0x7a), + (7, 0x7b), + (15, 0x7ffe), + (11, 0x7fc), + (14, 0x3ffd), + (13, 0x1ffd), + (28, 0x0fff_fffc), + (20, 0xfffe6), + (22, 0x003f_ffd2), + (20, 0xfffe7), + (20, 0xfffe8), + (22, 0x003f_ffd3), + (22, 0x003f_ffd4), + (22, 0x003f_ffd5), + (23, 0x007f_ffd9), + (22, 0x003f_ffd6), + (23, 0x007f_ffda), + (23, 0x007f_ffdb), + (23, 0x007f_ffdc), + (23, 0x007f_ffdd), + (23, 0x007f_ffde), + (24, 0x00ff_ffeb), + (23, 0x007f_ffdf), + (24, 0x00ff_ffec), + (24, 0x00ff_ffed), + (22, 0x003f_ffd7), + (23, 0x007f_ffe0), + (24, 0x00ff_ffee), + (23, 0x007f_ffe1), + (23, 0x007f_ffe2), + (23, 0x007f_ffe3), + (23, 0x007f_ffe4), + (21, 0x001f_ffdc), + (22, 0x003f_ffd8), + (23, 0x007f_ffe5), + (22, 0x003f_ffd9), + (23, 0x007f_ffe6), + (23, 0x007f_ffe7), + (24, 0x00ff_ffef), + (22, 0x003f_ffda), + (21, 0x001f_ffdd), + (20, 0xfffe9), + (22, 0x003f_ffdb), + (22, 0x003f_ffdc), + (23, 0x007f_ffe8), + (23, 0x007f_ffe9), + (21, 0x001f_ffde), + (23, 0x007f_ffea), + (22, 0x003f_ffdd), + (22, 0x003f_ffde), + (24, 0x00ff_fff0), + (21, 0x001f_ffdf), + (22, 0x003f_ffdf), + (23, 0x007f_ffeb), + (23, 0x007f_ffec), + (21, 0x001f_ffe0), + (21, 0x001f_ffe1), + (22, 0x003f_ffe0), + (21, 0x001f_ffe2), + (23, 0x007f_ffed), + (22, 0x003f_ffe1), + (23, 0x007f_ffee), + (23, 0x007f_ffef), + (20, 0xfffea), + (22, 0x003f_ffe2), + (22, 0x003f_ffe3), + (22, 0x003f_ffe4), + (23, 0x007f_fff0), + (22, 0x003f_ffe5), + (22, 0x003f_ffe6), + (23, 0x007f_fff1), + (26, 0x03ff_ffe0), + (26, 0x03ff_ffe1), + (20, 0xfffeb), + (19, 0x7fff1), + (22, 0x003f_ffe7), + (23, 0x007f_fff2), + (22, 0x003f_ffe8), + (25, 0x01ff_ffec), + (26, 0x03ff_ffe2), + (26, 0x03ff_ffe3), + (26, 0x03ff_ffe4), + (27, 0x07ff_ffde), + (27, 0x07ff_ffdf), + (26, 0x03ff_ffe5), + (24, 0x00ff_fff1), + (25, 0x01ff_ffed), + (19, 0x7fff2), + (21, 0x001f_ffe3), + (26, 0x03ff_ffe6), + (27, 0x07ff_ffe0), + (27, 0x07ff_ffe1), + (26, 0x03ff_ffe7), + (27, 0x07ff_ffe2), + (24, 0x00ff_fff2), + (21, 0x001f_ffe4), + (21, 0x001f_ffe5), + (26, 0x03ff_ffe8), + (26, 0x03ff_ffe9), + (28, 0x0fff_fffd), + (27, 0x07ff_ffe3), + (27, 0x07ff_ffe4), + (27, 0x07ff_ffe5), + (20, 0xfffec), + (24, 0x00ff_fff3), + (20, 0xfffed), + (21, 0x001f_ffe6), + (22, 0x003f_ffe9), + (21, 0x001f_ffe7), + (21, 0x001f_ffe8), + (23, 0x007f_fff3), + (22, 0x003f_ffea), + (22, 0x003f_ffeb), + (25, 0x01ff_ffee), + (25, 0x01ff_ffef), + (24, 0x00ff_fff4), + (24, 0x00ff_fff5), + (26, 0x03ff_ffea), + (23, 0x007f_fff4), + (26, 0x03ff_ffeb), + (27, 0x07ff_ffe6), + (26, 0x03ff_ffec), + (26, 0x03ff_ffed), + (27, 0x07ff_ffe7), + (27, 0x07ff_ffe8), + (27, 0x07ff_ffe9), + (27, 0x07ff_ffea), + (27, 0x07ff_ffeb), + (28, 0x0fff_fffe), + (27, 0x07ff_ffec), + (27, 0x07ff_ffed), + (27, 0x07ff_ffee), + (27, 0x07ff_ffef), + (27, 0x07ff_fff0), + (26, 0x03ff_ffee), + (30, 0x3fff_ffff), +]; + +// (next-state, byte, flags) +pub const DECODE_TABLE: [[(usize, u8, u8); 16]; 256] = [ + // 0 + [ + (4, 0, 0x00), + (5, 0, 0x00), + (7, 0, 0x00), + (8, 0, 0x00), + (11, 0, 0x00), + (12, 0, 0x00), + (16, 0, 0x00), + (19, 0, 0x00), + (25, 0, 0x00), + (28, 0, 0x00), + (32, 0, 0x00), + (35, 0, 0x00), + (42, 0, 0x00), + (49, 0, 0x00), + (57, 0, 0x00), + (64, 0, 0x01), + ], + // 1 + [ + (0, 48, 0x02), + (0, 49, 0x02), + (0, 50, 0x02), + (0, 97, 0x02), + (0, 99, 0x02), + (0, 101, 0x02), + (0, 105, 0x02), + (0, 111, 0x02), + (0, 115, 0x02), + (0, 116, 0x02), + (13, 0, 0x00), + (14, 0, 0x00), + (17, 0, 0x00), + (18, 0, 0x00), + (20, 0, 0x00), + (21, 0, 0x00), + ], + // 2 + [ + (1, 48, 0x02), + (22, 48, 0x03), + (1, 49, 0x02), + (22, 49, 0x03), + (1, 50, 0x02), + (22, 50, 0x03), + (1, 97, 0x02), + (22, 97, 0x03), + (1, 99, 0x02), + (22, 99, 0x03), + (1, 101, 0x02), + (22, 101, 0x03), + (1, 105, 0x02), + (22, 105, 0x03), + (1, 111, 0x02), + (22, 111, 0x03), + ], + // 3 + [ + (2, 48, 0x02), + (9, 48, 0x02), + (23, 48, 0x02), + (40, 48, 0x03), + (2, 49, 0x02), + (9, 49, 0x02), + (23, 49, 0x02), + (40, 49, 0x03), + (2, 50, 0x02), + (9, 50, 0x02), + (23, 50, 0x02), + (40, 50, 0x03), + (2, 97, 0x02), + (9, 97, 0x02), + (23, 97, 0x02), + (40, 97, 0x03), + ], + // 4 + [ + (3, 48, 0x02), + (6, 48, 0x02), + (10, 48, 0x02), + (15, 48, 0x02), + (24, 48, 0x02), + (31, 48, 0x02), + (41, 48, 0x02), + (56, 48, 0x03), + (3, 49, 0x02), + (6, 49, 0x02), + (10, 49, 0x02), + (15, 49, 0x02), + (24, 49, 0x02), + (31, 49, 0x02), + (41, 49, 0x02), + (56, 49, 0x03), + ], + // 5 + [ + (3, 50, 0x02), + (6, 50, 0x02), + (10, 50, 0x02), + (15, 50, 0x02), + (24, 50, 0x02), + (31, 50, 0x02), + (41, 50, 0x02), + (56, 50, 0x03), + (3, 97, 0x02), + (6, 97, 0x02), + (10, 97, 0x02), + (15, 97, 0x02), + (24, 97, 0x02), + (31, 97, 0x02), + (41, 97, 0x02), + (56, 97, 0x03), + ], + // 6 + [ + (2, 99, 0x02), + (9, 99, 0x02), + (23, 99, 0x02), + (40, 99, 0x03), + (2, 101, 0x02), + (9, 101, 0x02), + (23, 101, 0x02), + (40, 101, 0x03), + (2, 105, 0x02), + (9, 105, 0x02), + (23, 105, 0x02), + (40, 105, 0x03), + (2, 111, 0x02), + (9, 111, 0x02), + (23, 111, 0x02), + (40, 111, 0x03), + ], + // 7 + [ + (3, 99, 0x02), + (6, 99, 0x02), + (10, 99, 0x02), + (15, 99, 0x02), + (24, 99, 0x02), + (31, 99, 0x02), + (41, 99, 0x02), + (56, 99, 0x03), + (3, 101, 0x02), + (6, 101, 0x02), + (10, 101, 0x02), + (15, 101, 0x02), + (24, 101, 0x02), + (31, 101, 0x02), + (41, 101, 0x02), + (56, 101, 0x03), + ], + // 8 + [ + (3, 105, 0x02), + (6, 105, 0x02), + (10, 105, 0x02), + (15, 105, 0x02), + (24, 105, 0x02), + (31, 105, 0x02), + (41, 105, 0x02), + (56, 105, 0x03), + (3, 111, 0x02), + (6, 111, 0x02), + (10, 111, 0x02), + (15, 111, 0x02), + (24, 111, 0x02), + (31, 111, 0x02), + (41, 111, 0x02), + (56, 111, 0x03), + ], + // 9 + [ + (1, 115, 0x02), + (22, 115, 0x03), + (1, 116, 0x02), + (22, 116, 0x03), + (0, 32, 0x02), + (0, 37, 0x02), + (0, 45, 0x02), + (0, 46, 0x02), + (0, 47, 0x02), + (0, 51, 0x02), + (0, 52, 0x02), + (0, 53, 0x02), + (0, 54, 0x02), + (0, 55, 0x02), + (0, 56, 0x02), + (0, 57, 0x02), + ], + // 10 + [ + (2, 115, 0x02), + (9, 115, 0x02), + (23, 115, 0x02), + (40, 115, 0x03), + (2, 116, 0x02), + (9, 116, 0x02), + (23, 116, 0x02), + (40, 116, 0x03), + (1, 32, 0x02), + (22, 32, 0x03), + (1, 37, 0x02), + (22, 37, 0x03), + (1, 45, 0x02), + (22, 45, 0x03), + (1, 46, 0x02), + (22, 46, 0x03), + ], + // 11 + [ + (3, 115, 0x02), + (6, 115, 0x02), + (10, 115, 0x02), + (15, 115, 0x02), + (24, 115, 0x02), + (31, 115, 0x02), + (41, 115, 0x02), + (56, 115, 0x03), + (3, 116, 0x02), + (6, 116, 0x02), + (10, 116, 0x02), + (15, 116, 0x02), + (24, 116, 0x02), + (31, 116, 0x02), + (41, 116, 0x02), + (56, 116, 0x03), + ], + // 12 + [ + (2, 32, 0x02), + (9, 32, 0x02), + (23, 32, 0x02), + (40, 32, 0x03), + (2, 37, 0x02), + (9, 37, 0x02), + (23, 37, 0x02), + (40, 37, 0x03), + (2, 45, 0x02), + (9, 45, 0x02), + (23, 45, 0x02), + (40, 45, 0x03), + (2, 46, 0x02), + (9, 46, 0x02), + (23, 46, 0x02), + (40, 46, 0x03), + ], + // 13 + [ + (3, 32, 0x02), + (6, 32, 0x02), + (10, 32, 0x02), + (15, 32, 0x02), + (24, 32, 0x02), + (31, 32, 0x02), + (41, 32, 0x02), + (56, 32, 0x03), + (3, 37, 0x02), + (6, 37, 0x02), + (10, 37, 0x02), + (15, 37, 0x02), + (24, 37, 0x02), + (31, 37, 0x02), + (41, 37, 0x02), + (56, 37, 0x03), + ], + // 14 + [ + (3, 45, 0x02), + (6, 45, 0x02), + (10, 45, 0x02), + (15, 45, 0x02), + (24, 45, 0x02), + (31, 45, 0x02), + (41, 45, 0x02), + (56, 45, 0x03), + (3, 46, 0x02), + (6, 46, 0x02), + (10, 46, 0x02), + (15, 46, 0x02), + (24, 46, 0x02), + (31, 46, 0x02), + (41, 46, 0x02), + (56, 46, 0x03), + ], + // 15 + [ + (1, 47, 0x02), + (22, 47, 0x03), + (1, 51, 0x02), + (22, 51, 0x03), + (1, 52, 0x02), + (22, 52, 0x03), + (1, 53, 0x02), + (22, 53, 0x03), + (1, 54, 0x02), + (22, 54, 0x03), + (1, 55, 0x02), + (22, 55, 0x03), + (1, 56, 0x02), + (22, 56, 0x03), + (1, 57, 0x02), + (22, 57, 0x03), + ], + // 16 + [ + (2, 47, 0x02), + (9, 47, 0x02), + (23, 47, 0x02), + (40, 47, 0x03), + (2, 51, 0x02), + (9, 51, 0x02), + (23, 51, 0x02), + (40, 51, 0x03), + (2, 52, 0x02), + (9, 52, 0x02), + (23, 52, 0x02), + (40, 52, 0x03), + (2, 53, 0x02), + (9, 53, 0x02), + (23, 53, 0x02), + (40, 53, 0x03), + ], + // 17 + [ + (3, 47, 0x02), + (6, 47, 0x02), + (10, 47, 0x02), + (15, 47, 0x02), + (24, 47, 0x02), + (31, 47, 0x02), + (41, 47, 0x02), + (56, 47, 0x03), + (3, 51, 0x02), + (6, 51, 0x02), + (10, 51, 0x02), + (15, 51, 0x02), + (24, 51, 0x02), + (31, 51, 0x02), + (41, 51, 0x02), + (56, 51, 0x03), + ], + // 18 + [ + (3, 52, 0x02), + (6, 52, 0x02), + (10, 52, 0x02), + (15, 52, 0x02), + (24, 52, 0x02), + (31, 52, 0x02), + (41, 52, 0x02), + (56, 52, 0x03), + (3, 53, 0x02), + (6, 53, 0x02), + (10, 53, 0x02), + (15, 53, 0x02), + (24, 53, 0x02), + (31, 53, 0x02), + (41, 53, 0x02), + (56, 53, 0x03), + ], + // 19 + [ + (2, 54, 0x02), + (9, 54, 0x02), + (23, 54, 0x02), + (40, 54, 0x03), + (2, 55, 0x02), + (9, 55, 0x02), + (23, 55, 0x02), + (40, 55, 0x03), + (2, 56, 0x02), + (9, 56, 0x02), + (23, 56, 0x02), + (40, 56, 0x03), + (2, 57, 0x02), + (9, 57, 0x02), + (23, 57, 0x02), + (40, 57, 0x03), + ], + // 20 + [ + (3, 54, 0x02), + (6, 54, 0x02), + (10, 54, 0x02), + (15, 54, 0x02), + (24, 54, 0x02), + (31, 54, 0x02), + (41, 54, 0x02), + (56, 54, 0x03), + (3, 55, 0x02), + (6, 55, 0x02), + (10, 55, 0x02), + (15, 55, 0x02), + (24, 55, 0x02), + (31, 55, 0x02), + (41, 55, 0x02), + (56, 55, 0x03), + ], + // 21 + [ + (3, 56, 0x02), + (6, 56, 0x02), + (10, 56, 0x02), + (15, 56, 0x02), + (24, 56, 0x02), + (31, 56, 0x02), + (41, 56, 0x02), + (56, 56, 0x03), + (3, 57, 0x02), + (6, 57, 0x02), + (10, 57, 0x02), + (15, 57, 0x02), + (24, 57, 0x02), + (31, 57, 0x02), + (41, 57, 0x02), + (56, 57, 0x03), + ], + // 22 + [ + (26, 0, 0x00), + (27, 0, 0x00), + (29, 0, 0x00), + (30, 0, 0x00), + (33, 0, 0x00), + (34, 0, 0x00), + (36, 0, 0x00), + (37, 0, 0x00), + (43, 0, 0x00), + (46, 0, 0x00), + (50, 0, 0x00), + (53, 0, 0x00), + (58, 0, 0x00), + (61, 0, 0x00), + (65, 0, 0x00), + (68, 0, 0x01), + ], + // 23 + [ + (0, 61, 0x02), + (0, 65, 0x02), + (0, 95, 0x02), + (0, 98, 0x02), + (0, 100, 0x02), + (0, 102, 0x02), + (0, 103, 0x02), + (0, 104, 0x02), + (0, 108, 0x02), + (0, 109, 0x02), + (0, 110, 0x02), + (0, 112, 0x02), + (0, 114, 0x02), + (0, 117, 0x02), + (38, 0, 0x00), + (39, 0, 0x00), + ], + // 24 + [ + (1, 61, 0x02), + (22, 61, 0x03), + (1, 65, 0x02), + (22, 65, 0x03), + (1, 95, 0x02), + (22, 95, 0x03), + (1, 98, 0x02), + (22, 98, 0x03), + (1, 100, 0x02), + (22, 100, 0x03), + (1, 102, 0x02), + (22, 102, 0x03), + (1, 103, 0x02), + (22, 103, 0x03), + (1, 104, 0x02), + (22, 104, 0x03), + ], + // 25 + [ + (2, 61, 0x02), + (9, 61, 0x02), + (23, 61, 0x02), + (40, 61, 0x03), + (2, 65, 0x02), + (9, 65, 0x02), + (23, 65, 0x02), + (40, 65, 0x03), + (2, 95, 0x02), + (9, 95, 0x02), + (23, 95, 0x02), + (40, 95, 0x03), + (2, 98, 0x02), + (9, 98, 0x02), + (23, 98, 0x02), + (40, 98, 0x03), + ], + // 26 + [ + (3, 61, 0x02), + (6, 61, 0x02), + (10, 61, 0x02), + (15, 61, 0x02), + (24, 61, 0x02), + (31, 61, 0x02), + (41, 61, 0x02), + (56, 61, 0x03), + (3, 65, 0x02), + (6, 65, 0x02), + (10, 65, 0x02), + (15, 65, 0x02), + (24, 65, 0x02), + (31, 65, 0x02), + (41, 65, 0x02), + (56, 65, 0x03), + ], + // 27 + [ + (3, 95, 0x02), + (6, 95, 0x02), + (10, 95, 0x02), + (15, 95, 0x02), + (24, 95, 0x02), + (31, 95, 0x02), + (41, 95, 0x02), + (56, 95, 0x03), + (3, 98, 0x02), + (6, 98, 0x02), + (10, 98, 0x02), + (15, 98, 0x02), + (24, 98, 0x02), + (31, 98, 0x02), + (41, 98, 0x02), + (56, 98, 0x03), + ], + // 28 + [ + (2, 100, 0x02), + (9, 100, 0x02), + (23, 100, 0x02), + (40, 100, 0x03), + (2, 102, 0x02), + (9, 102, 0x02), + (23, 102, 0x02), + (40, 102, 0x03), + (2, 103, 0x02), + (9, 103, 0x02), + (23, 103, 0x02), + (40, 103, 0x03), + (2, 104, 0x02), + (9, 104, 0x02), + (23, 104, 0x02), + (40, 104, 0x03), + ], + // 29 + [ + (3, 100, 0x02), + (6, 100, 0x02), + (10, 100, 0x02), + (15, 100, 0x02), + (24, 100, 0x02), + (31, 100, 0x02), + (41, 100, 0x02), + (56, 100, 0x03), + (3, 102, 0x02), + (6, 102, 0x02), + (10, 102, 0x02), + (15, 102, 0x02), + (24, 102, 0x02), + (31, 102, 0x02), + (41, 102, 0x02), + (56, 102, 0x03), + ], + // 30 + [ + (3, 103, 0x02), + (6, 103, 0x02), + (10, 103, 0x02), + (15, 103, 0x02), + (24, 103, 0x02), + (31, 103, 0x02), + (41, 103, 0x02), + (56, 103, 0x03), + (3, 104, 0x02), + (6, 104, 0x02), + (10, 104, 0x02), + (15, 104, 0x02), + (24, 104, 0x02), + (31, 104, 0x02), + (41, 104, 0x02), + (56, 104, 0x03), + ], + // 31 + [ + (1, 108, 0x02), + (22, 108, 0x03), + (1, 109, 0x02), + (22, 109, 0x03), + (1, 110, 0x02), + (22, 110, 0x03), + (1, 112, 0x02), + (22, 112, 0x03), + (1, 114, 0x02), + (22, 114, 0x03), + (1, 117, 0x02), + (22, 117, 0x03), + (0, 58, 0x02), + (0, 66, 0x02), + (0, 67, 0x02), + (0, 68, 0x02), + ], + // 32 + [ + (2, 108, 0x02), + (9, 108, 0x02), + (23, 108, 0x02), + (40, 108, 0x03), + (2, 109, 0x02), + (9, 109, 0x02), + (23, 109, 0x02), + (40, 109, 0x03), + (2, 110, 0x02), + (9, 110, 0x02), + (23, 110, 0x02), + (40, 110, 0x03), + (2, 112, 0x02), + (9, 112, 0x02), + (23, 112, 0x02), + (40, 112, 0x03), + ], + // 33 + [ + (3, 108, 0x02), + (6, 108, 0x02), + (10, 108, 0x02), + (15, 108, 0x02), + (24, 108, 0x02), + (31, 108, 0x02), + (41, 108, 0x02), + (56, 108, 0x03), + (3, 109, 0x02), + (6, 109, 0x02), + (10, 109, 0x02), + (15, 109, 0x02), + (24, 109, 0x02), + (31, 109, 0x02), + (41, 109, 0x02), + (56, 109, 0x03), + ], + // 34 + [ + (3, 110, 0x02), + (6, 110, 0x02), + (10, 110, 0x02), + (15, 110, 0x02), + (24, 110, 0x02), + (31, 110, 0x02), + (41, 110, 0x02), + (56, 110, 0x03), + (3, 112, 0x02), + (6, 112, 0x02), + (10, 112, 0x02), + (15, 112, 0x02), + (24, 112, 0x02), + (31, 112, 0x02), + (41, 112, 0x02), + (56, 112, 0x03), + ], + // 35 + [ + (2, 114, 0x02), + (9, 114, 0x02), + (23, 114, 0x02), + (40, 114, 0x03), + (2, 117, 0x02), + (9, 117, 0x02), + (23, 117, 0x02), + (40, 117, 0x03), + (1, 58, 0x02), + (22, 58, 0x03), + (1, 66, 0x02), + (22, 66, 0x03), + (1, 67, 0x02), + (22, 67, 0x03), + (1, 68, 0x02), + (22, 68, 0x03), + ], + // 36 + [ + (3, 114, 0x02), + (6, 114, 0x02), + (10, 114, 0x02), + (15, 114, 0x02), + (24, 114, 0x02), + (31, 114, 0x02), + (41, 114, 0x02), + (56, 114, 0x03), + (3, 117, 0x02), + (6, 117, 0x02), + (10, 117, 0x02), + (15, 117, 0x02), + (24, 117, 0x02), + (31, 117, 0x02), + (41, 117, 0x02), + (56, 117, 0x03), + ], + // 37 + [ + (2, 58, 0x02), + (9, 58, 0x02), + (23, 58, 0x02), + (40, 58, 0x03), + (2, 66, 0x02), + (9, 66, 0x02), + (23, 66, 0x02), + (40, 66, 0x03), + (2, 67, 0x02), + (9, 67, 0x02), + (23, 67, 0x02), + (40, 67, 0x03), + (2, 68, 0x02), + (9, 68, 0x02), + (23, 68, 0x02), + (40, 68, 0x03), + ], + // 38 + [ + (3, 58, 0x02), + (6, 58, 0x02), + (10, 58, 0x02), + (15, 58, 0x02), + (24, 58, 0x02), + (31, 58, 0x02), + (41, 58, 0x02), + (56, 58, 0x03), + (3, 66, 0x02), + (6, 66, 0x02), + (10, 66, 0x02), + (15, 66, 0x02), + (24, 66, 0x02), + (31, 66, 0x02), + (41, 66, 0x02), + (56, 66, 0x03), + ], + // 39 + [ + (3, 67, 0x02), + (6, 67, 0x02), + (10, 67, 0x02), + (15, 67, 0x02), + (24, 67, 0x02), + (31, 67, 0x02), + (41, 67, 0x02), + (56, 67, 0x03), + (3, 68, 0x02), + (6, 68, 0x02), + (10, 68, 0x02), + (15, 68, 0x02), + (24, 68, 0x02), + (31, 68, 0x02), + (41, 68, 0x02), + (56, 68, 0x03), + ], + // 40 + [ + (44, 0, 0x00), + (45, 0, 0x00), + (47, 0, 0x00), + (48, 0, 0x00), + (51, 0, 0x00), + (52, 0, 0x00), + (54, 0, 0x00), + (55, 0, 0x00), + (59, 0, 0x00), + (60, 0, 0x00), + (62, 0, 0x00), + (63, 0, 0x00), + (66, 0, 0x00), + (67, 0, 0x00), + (69, 0, 0x00), + (72, 0, 0x01), + ], + // 41 + [ + (0, 69, 0x02), + (0, 70, 0x02), + (0, 71, 0x02), + (0, 72, 0x02), + (0, 73, 0x02), + (0, 74, 0x02), + (0, 75, 0x02), + (0, 76, 0x02), + (0, 77, 0x02), + (0, 78, 0x02), + (0, 79, 0x02), + (0, 80, 0x02), + (0, 81, 0x02), + (0, 82, 0x02), + (0, 83, 0x02), + (0, 84, 0x02), + ], + // 42 + [ + (1, 69, 0x02), + (22, 69, 0x03), + (1, 70, 0x02), + (22, 70, 0x03), + (1, 71, 0x02), + (22, 71, 0x03), + (1, 72, 0x02), + (22, 72, 0x03), + (1, 73, 0x02), + (22, 73, 0x03), + (1, 74, 0x02), + (22, 74, 0x03), + (1, 75, 0x02), + (22, 75, 0x03), + (1, 76, 0x02), + (22, 76, 0x03), + ], + // 43 + [ + (2, 69, 0x02), + (9, 69, 0x02), + (23, 69, 0x02), + (40, 69, 0x03), + (2, 70, 0x02), + (9, 70, 0x02), + (23, 70, 0x02), + (40, 70, 0x03), + (2, 71, 0x02), + (9, 71, 0x02), + (23, 71, 0x02), + (40, 71, 0x03), + (2, 72, 0x02), + (9, 72, 0x02), + (23, 72, 0x02), + (40, 72, 0x03), + ], + // 44 + [ + (3, 69, 0x02), + (6, 69, 0x02), + (10, 69, 0x02), + (15, 69, 0x02), + (24, 69, 0x02), + (31, 69, 0x02), + (41, 69, 0x02), + (56, 69, 0x03), + (3, 70, 0x02), + (6, 70, 0x02), + (10, 70, 0x02), + (15, 70, 0x02), + (24, 70, 0x02), + (31, 70, 0x02), + (41, 70, 0x02), + (56, 70, 0x03), + ], + // 45 + [ + (3, 71, 0x02), + (6, 71, 0x02), + (10, 71, 0x02), + (15, 71, 0x02), + (24, 71, 0x02), + (31, 71, 0x02), + (41, 71, 0x02), + (56, 71, 0x03), + (3, 72, 0x02), + (6, 72, 0x02), + (10, 72, 0x02), + (15, 72, 0x02), + (24, 72, 0x02), + (31, 72, 0x02), + (41, 72, 0x02), + (56, 72, 0x03), + ], + // 46 + [ + (2, 73, 0x02), + (9, 73, 0x02), + (23, 73, 0x02), + (40, 73, 0x03), + (2, 74, 0x02), + (9, 74, 0x02), + (23, 74, 0x02), + (40, 74, 0x03), + (2, 75, 0x02), + (9, 75, 0x02), + (23, 75, 0x02), + (40, 75, 0x03), + (2, 76, 0x02), + (9, 76, 0x02), + (23, 76, 0x02), + (40, 76, 0x03), + ], + // 47 + [ + (3, 73, 0x02), + (6, 73, 0x02), + (10, 73, 0x02), + (15, 73, 0x02), + (24, 73, 0x02), + (31, 73, 0x02), + (41, 73, 0x02), + (56, 73, 0x03), + (3, 74, 0x02), + (6, 74, 0x02), + (10, 74, 0x02), + (15, 74, 0x02), + (24, 74, 0x02), + (31, 74, 0x02), + (41, 74, 0x02), + (56, 74, 0x03), + ], + // 48 + [ + (3, 75, 0x02), + (6, 75, 0x02), + (10, 75, 0x02), + (15, 75, 0x02), + (24, 75, 0x02), + (31, 75, 0x02), + (41, 75, 0x02), + (56, 75, 0x03), + (3, 76, 0x02), + (6, 76, 0x02), + (10, 76, 0x02), + (15, 76, 0x02), + (24, 76, 0x02), + (31, 76, 0x02), + (41, 76, 0x02), + (56, 76, 0x03), + ], + // 49 + [ + (1, 77, 0x02), + (22, 77, 0x03), + (1, 78, 0x02), + (22, 78, 0x03), + (1, 79, 0x02), + (22, 79, 0x03), + (1, 80, 0x02), + (22, 80, 0x03), + (1, 81, 0x02), + (22, 81, 0x03), + (1, 82, 0x02), + (22, 82, 0x03), + (1, 83, 0x02), + (22, 83, 0x03), + (1, 84, 0x02), + (22, 84, 0x03), + ], + // 50 + [ + (2, 77, 0x02), + (9, 77, 0x02), + (23, 77, 0x02), + (40, 77, 0x03), + (2, 78, 0x02), + (9, 78, 0x02), + (23, 78, 0x02), + (40, 78, 0x03), + (2, 79, 0x02), + (9, 79, 0x02), + (23, 79, 0x02), + (40, 79, 0x03), + (2, 80, 0x02), + (9, 80, 0x02), + (23, 80, 0x02), + (40, 80, 0x03), + ], + // 51 + [ + (3, 77, 0x02), + (6, 77, 0x02), + (10, 77, 0x02), + (15, 77, 0x02), + (24, 77, 0x02), + (31, 77, 0x02), + (41, 77, 0x02), + (56, 77, 0x03), + (3, 78, 0x02), + (6, 78, 0x02), + (10, 78, 0x02), + (15, 78, 0x02), + (24, 78, 0x02), + (31, 78, 0x02), + (41, 78, 0x02), + (56, 78, 0x03), + ], + // 52 + [ + (3, 79, 0x02), + (6, 79, 0x02), + (10, 79, 0x02), + (15, 79, 0x02), + (24, 79, 0x02), + (31, 79, 0x02), + (41, 79, 0x02), + (56, 79, 0x03), + (3, 80, 0x02), + (6, 80, 0x02), + (10, 80, 0x02), + (15, 80, 0x02), + (24, 80, 0x02), + (31, 80, 0x02), + (41, 80, 0x02), + (56, 80, 0x03), + ], + // 53 + [ + (2, 81, 0x02), + (9, 81, 0x02), + (23, 81, 0x02), + (40, 81, 0x03), + (2, 82, 0x02), + (9, 82, 0x02), + (23, 82, 0x02), + 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0x00), + (71, 0, 0x00), + (73, 0, 0x00), + (74, 0, 0x01), + ], + // 57 + [ + (1, 85, 0x02), + (22, 85, 0x03), + (1, 86, 0x02), + (22, 86, 0x03), + (1, 87, 0x02), + (22, 87, 0x03), + (1, 89, 0x02), + (22, 89, 0x03), + (1, 106, 0x02), + (22, 106, 0x03), + (1, 107, 0x02), + (22, 107, 0x03), + (1, 113, 0x02), + (22, 113, 0x03), + (1, 118, 0x02), + (22, 118, 0x03), + ], + // 58 + [ + (2, 85, 0x02), + (9, 85, 0x02), + (23, 85, 0x02), + (40, 85, 0x03), + (2, 86, 0x02), + (9, 86, 0x02), + (23, 86, 0x02), + (40, 86, 0x03), + (2, 87, 0x02), + (9, 87, 0x02), + (23, 87, 0x02), + (40, 87, 0x03), + (2, 89, 0x02), + (9, 89, 0x02), + (23, 89, 0x02), + (40, 89, 0x03), + ], + // 59 + [ + (3, 85, 0x02), + (6, 85, 0x02), + (10, 85, 0x02), + (15, 85, 0x02), + (24, 85, 0x02), + (31, 85, 0x02), + (41, 85, 0x02), + (56, 85, 0x03), + (3, 86, 0x02), + (6, 86, 0x02), + (10, 86, 0x02), + (15, 86, 0x02), + (24, 86, 0x02), + (31, 86, 0x02), + (41, 86, 0x02), + (56, 86, 0x03), + ], + // 60 + [ + (3, 87, 0x02), + (6, 87, 0x02), + (10, 87, 0x02), + (15, 87, 0x02), + (24, 87, 0x02), + (31, 87, 0x02), + (41, 87, 0x02), + (56, 87, 0x03), + (3, 89, 0x02), + (6, 89, 0x02), + (10, 89, 0x02), + (15, 89, 0x02), + (24, 89, 0x02), + (31, 89, 0x02), + (41, 89, 0x02), + (56, 89, 0x03), + ], + // 61 + [ + (2, 106, 0x02), + (9, 106, 0x02), + (23, 106, 0x02), + (40, 106, 0x03), + (2, 107, 0x02), + (9, 107, 0x02), + (23, 107, 0x02), + (40, 107, 0x03), + (2, 113, 0x02), + (9, 113, 0x02), + (23, 113, 0x02), + (40, 113, 0x03), + (2, 118, 0x02), + (9, 118, 0x02), + (23, 118, 0x02), + (40, 118, 0x03), + ], + // 62 + [ + (3, 106, 0x02), + (6, 106, 0x02), + (10, 106, 0x02), + (15, 106, 0x02), + (24, 106, 0x02), + (31, 106, 0x02), + (41, 106, 0x02), + (56, 106, 0x03), + (3, 107, 0x02), + (6, 107, 0x02), + (10, 107, 0x02), + (15, 107, 0x02), + (24, 107, 0x02), + (31, 107, 0x02), + (41, 107, 0x02), + (56, 107, 0x03), + ], + // 63 + [ + (3, 113, 0x02), + (6, 113, 0x02), + (10, 113, 0x02), + (15, 113, 0x02), + (24, 113, 0x02), + (31, 113, 0x02), + (41, 113, 0x02), + (56, 113, 0x03), + (3, 118, 0x02), + (6, 118, 0x02), + (10, 118, 0x02), + (15, 118, 0x02), + (24, 118, 0x02), + (31, 118, 0x02), + (41, 118, 0x02), + (56, 118, 0x03), + ], + // 64 + [ + (1, 119, 0x02), + (22, 119, 0x03), + (1, 120, 0x02), + (22, 120, 0x03), + (1, 121, 0x02), + (22, 121, 0x03), + (1, 122, 0x02), + (22, 122, 0x03), + (0, 38, 0x02), + (0, 42, 0x02), + (0, 44, 0x02), + (0, 59, 0x02), + (0, 88, 0x02), + (0, 90, 0x02), + (75, 0, 0x00), + (78, 0, 0x00), + ], + // 65 + [ + (2, 119, 0x02), + (9, 119, 0x02), + (23, 119, 0x02), + (40, 119, 0x03), + (2, 120, 0x02), + (9, 120, 0x02), + (23, 120, 0x02), + (40, 120, 0x03), + (2, 121, 0x02), + (9, 121, 0x02), + (23, 121, 0x02), + (40, 121, 0x03), + (2, 122, 0x02), + (9, 122, 0x02), + (23, 122, 0x02), + (40, 122, 0x03), + ], + // 66 + [ + (3, 119, 0x02), + (6, 119, 0x02), + (10, 119, 0x02), + (15, 119, 0x02), + (24, 119, 0x02), + (31, 119, 0x02), + (41, 119, 0x02), + (56, 119, 0x03), + (3, 120, 0x02), + (6, 120, 0x02), + (10, 120, 0x02), + (15, 120, 0x02), + (24, 120, 0x02), + (31, 120, 0x02), + (41, 120, 0x02), + (56, 120, 0x03), + ], + // 67 + [ + (3, 121, 0x02), + (6, 121, 0x02), + (10, 121, 0x02), + (15, 121, 0x02), + (24, 121, 0x02), + (31, 121, 0x02), + (41, 121, 0x02), + (56, 121, 0x03), + (3, 122, 0x02), + (6, 122, 0x02), + (10, 122, 0x02), + (15, 122, 0x02), + (24, 122, 0x02), + (31, 122, 0x02), + (41, 122, 0x02), + (56, 122, 0x03), + ], + // 68 + [ + (1, 38, 0x02), + (22, 38, 0x03), + (1, 42, 0x02), + (22, 42, 0x03), + (1, 44, 0x02), + (22, 44, 0x03), + (1, 59, 0x02), + (22, 59, 0x03), + (1, 88, 0x02), + (22, 88, 0x03), + (1, 90, 0x02), + (22, 90, 0x03), + (76, 0, 0x00), + (77, 0, 0x00), + (79, 0, 0x00), + (81, 0, 0x00), + ], + // 69 + [ + (2, 38, 0x02), + (9, 38, 0x02), + (23, 38, 0x02), + (40, 38, 0x03), + (2, 42, 0x02), + (9, 42, 0x02), + (23, 42, 0x02), + (40, 42, 0x03), + (2, 44, 0x02), + (9, 44, 0x02), + (23, 44, 0x02), + (40, 44, 0x03), + (2, 59, 0x02), + (9, 59, 0x02), + (23, 59, 0x02), + (40, 59, 0x03), + ], + // 70 + [ + (3, 38, 0x02), + (6, 38, 0x02), + (10, 38, 0x02), + (15, 38, 0x02), + (24, 38, 0x02), + (31, 38, 0x02), + (41, 38, 0x02), + (56, 38, 0x03), + (3, 42, 0x02), + (6, 42, 0x02), + (10, 42, 0x02), + (15, 42, 0x02), + (24, 42, 0x02), + (31, 42, 0x02), + (41, 42, 0x02), + (56, 42, 0x03), + ], + // 71 + [ + (3, 44, 0x02), + (6, 44, 0x02), + (10, 44, 0x02), + (15, 44, 0x02), + (24, 44, 0x02), + (31, 44, 0x02), + (41, 44, 0x02), + (56, 44, 0x03), + (3, 59, 0x02), + (6, 59, 0x02), + (10, 59, 0x02), + (15, 59, 0x02), + (24, 59, 0x02), + (31, 59, 0x02), + (41, 59, 0x02), + (56, 59, 0x03), + ], + // 72 + [ + (2, 88, 0x02), + (9, 88, 0x02), + (23, 88, 0x02), + (40, 88, 0x03), + (2, 90, 0x02), + (9, 90, 0x02), + (23, 90, 0x02), + (40, 90, 0x03), + (0, 33, 0x02), + (0, 34, 0x02), + (0, 40, 0x02), + (0, 41, 0x02), + (0, 63, 0x02), + (80, 0, 0x00), + (82, 0, 0x00), + (84, 0, 0x00), + ], + // 73 + [ + (3, 88, 0x02), + (6, 88, 0x02), + (10, 88, 0x02), + (15, 88, 0x02), + (24, 88, 0x02), + (31, 88, 0x02), + (41, 88, 0x02), + (56, 88, 0x03), + (3, 90, 0x02), + (6, 90, 0x02), + (10, 90, 0x02), + (15, 90, 0x02), + (24, 90, 0x02), + (31, 90, 0x02), + (41, 90, 0x02), + (56, 90, 0x03), + ], + // 74 + [ + (1, 33, 0x02), + (22, 33, 0x03), + (1, 34, 0x02), + (22, 34, 0x03), + (1, 40, 0x02), + (22, 40, 0x03), + (1, 41, 0x02), + (22, 41, 0x03), + (1, 63, 0x02), + (22, 63, 0x03), + (0, 39, 0x02), + (0, 43, 0x02), + (0, 124, 0x02), + (83, 0, 0x00), + (85, 0, 0x00), + (88, 0, 0x00), + ], + // 75 + [ + (2, 33, 0x02), + (9, 33, 0x02), + (23, 33, 0x02), + (40, 33, 0x03), + (2, 34, 0x02), + (9, 34, 0x02), + (23, 34, 0x02), + (40, 34, 0x03), + (2, 40, 0x02), + (9, 40, 0x02), + (23, 40, 0x02), + (40, 40, 0x03), + (2, 41, 0x02), + (9, 41, 0x02), + (23, 41, 0x02), + (40, 41, 0x03), + ], + // 76 + [ + (3, 33, 0x02), + (6, 33, 0x02), + (10, 33, 0x02), + (15, 33, 0x02), + (24, 33, 0x02), + (31, 33, 0x02), + (41, 33, 0x02), + (56, 33, 0x03), + (3, 34, 0x02), + (6, 34, 0x02), + (10, 34, 0x02), + (15, 34, 0x02), + (24, 34, 0x02), + (31, 34, 0x02), + (41, 34, 0x02), + (56, 34, 0x03), + ], + // 77 + [ + (3, 40, 0x02), + (6, 40, 0x02), + (10, 40, 0x02), + (15, 40, 0x02), + (24, 40, 0x02), + (31, 40, 0x02), + (41, 40, 0x02), + (56, 40, 0x03), + (3, 41, 0x02), + (6, 41, 0x02), + (10, 41, 0x02), + (15, 41, 0x02), + (24, 41, 0x02), + (31, 41, 0x02), + (41, 41, 0x02), + (56, 41, 0x03), + ], + // 78 + [ + (2, 63, 0x02), + (9, 63, 0x02), + (23, 63, 0x02), + (40, 63, 0x03), + (1, 39, 0x02), + (22, 39, 0x03), + (1, 43, 0x02), + (22, 43, 0x03), + (1, 124, 0x02), + (22, 124, 0x03), + (0, 35, 0x02), + (0, 62, 0x02), + (86, 0, 0x00), + (87, 0, 0x00), + (89, 0, 0x00), + (90, 0, 0x00), + ], + // 79 + [ + (3, 63, 0x02), + (6, 63, 0x02), + (10, 63, 0x02), + (15, 63, 0x02), + (24, 63, 0x02), + (31, 63, 0x02), + (41, 63, 0x02), + (56, 63, 0x03), + (2, 39, 0x02), + (9, 39, 0x02), + (23, 39, 0x02), + (40, 39, 0x03), + (2, 43, 0x02), + (9, 43, 0x02), + (23, 43, 0x02), + (40, 43, 0x03), + ], + // 80 + [ + (3, 39, 0x02), + (6, 39, 0x02), + (10, 39, 0x02), + (15, 39, 0x02), + (24, 39, 0x02), + (31, 39, 0x02), + (41, 39, 0x02), + (56, 39, 0x03), + (3, 43, 0x02), + (6, 43, 0x02), + (10, 43, 0x02), + (15, 43, 0x02), + (24, 43, 0x02), + (31, 43, 0x02), + (41, 43, 0x02), + (56, 43, 0x03), + ], + // 81 + [ + (2, 124, 0x02), + (9, 124, 0x02), + (23, 124, 0x02), + (40, 124, 0x03), + (1, 35, 0x02), + (22, 35, 0x03), + (1, 62, 0x02), + (22, 62, 0x03), + (0, 0, 0x02), + (0, 36, 0x02), + (0, 64, 0x02), + (0, 91, 0x02), + (0, 93, 0x02), + (0, 126, 0x02), + (91, 0, 0x00), + (92, 0, 0x00), + ], + // 82 + [ + (3, 124, 0x02), + (6, 124, 0x02), + (10, 124, 0x02), + (15, 124, 0x02), + (24, 124, 0x02), + (31, 124, 0x02), + (41, 124, 0x02), + (56, 124, 0x03), + (2, 35, 0x02), + (9, 35, 0x02), + (23, 35, 0x02), + (40, 35, 0x03), + (2, 62, 0x02), + (9, 62, 0x02), + (23, 62, 0x02), + (40, 62, 0x03), + ], + // 83 + [ + (3, 35, 0x02), + (6, 35, 0x02), + (10, 35, 0x02), + (15, 35, 0x02), + (24, 35, 0x02), + (31, 35, 0x02), + (41, 35, 0x02), + (56, 35, 0x03), + (3, 62, 0x02), + (6, 62, 0x02), + (10, 62, 0x02), + (15, 62, 0x02), + (24, 62, 0x02), + (31, 62, 0x02), + (41, 62, 0x02), + (56, 62, 0x03), + ], + // 84 + [ + (1, 0, 0x02), + (22, 0, 0x03), + (1, 36, 0x02), + (22, 36, 0x03), + (1, 64, 0x02), + (22, 64, 0x03), + (1, 91, 0x02), + (22, 91, 0x03), + (1, 93, 0x02), + (22, 93, 0x03), + (1, 126, 0x02), + (22, 126, 0x03), + (0, 94, 0x02), + (0, 125, 0x02), + (93, 0, 0x00), + (94, 0, 0x00), + ], + // 85 + [ + (2, 0, 0x02), + (9, 0, 0x02), + (23, 0, 0x02), + (40, 0, 0x03), + (2, 36, 0x02), + (9, 36, 0x02), + (23, 36, 0x02), + (40, 36, 0x03), + (2, 64, 0x02), + (9, 64, 0x02), + (23, 64, 0x02), + (40, 64, 0x03), + (2, 91, 0x02), + (9, 91, 0x02), + (23, 91, 0x02), + (40, 91, 0x03), + ], + // 86 + [ + (3, 0, 0x02), + (6, 0, 0x02), + (10, 0, 0x02), + (15, 0, 0x02), + (24, 0, 0x02), + (31, 0, 0x02), + (41, 0, 0x02), + (56, 0, 0x03), + (3, 36, 0x02), + (6, 36, 0x02), + (10, 36, 0x02), + (15, 36, 0x02), + (24, 36, 0x02), + (31, 36, 0x02), + (41, 36, 0x02), + (56, 36, 0x03), + ], + // 87 + [ + (3, 64, 0x02), + (6, 64, 0x02), + (10, 64, 0x02), + (15, 64, 0x02), + (24, 64, 0x02), + (31, 64, 0x02), + (41, 64, 0x02), + (56, 64, 0x03), + (3, 91, 0x02), + (6, 91, 0x02), + (10, 91, 0x02), + (15, 91, 0x02), + (24, 91, 0x02), + (31, 91, 0x02), + (41, 91, 0x02), + (56, 91, 0x03), + ], + // 88 + [ + (2, 93, 0x02), + (9, 93, 0x02), + (23, 93, 0x02), + (40, 93, 0x03), + (2, 126, 0x02), + (9, 126, 0x02), + (23, 126, 0x02), + (40, 126, 0x03), + (1, 94, 0x02), + (22, 94, 0x03), + (1, 125, 0x02), + (22, 125, 0x03), + (0, 60, 0x02), + (0, 96, 0x02), + (0, 123, 0x02), + (95, 0, 0x00), + ], + // 89 + [ + (3, 93, 0x02), + (6, 93, 0x02), + (10, 93, 0x02), + (15, 93, 0x02), + (24, 93, 0x02), + (31, 93, 0x02), + (41, 93, 0x02), + (56, 93, 0x03), + (3, 126, 0x02), + (6, 126, 0x02), + (10, 126, 0x02), + (15, 126, 0x02), + (24, 126, 0x02), + (31, 126, 0x02), + (41, 126, 0x02), + (56, 126, 0x03), + ], + // 90 + [ + (2, 94, 0x02), + (9, 94, 0x02), + (23, 94, 0x02), + (40, 94, 0x03), + (2, 125, 0x02), + (9, 125, 0x02), + (23, 125, 0x02), + (40, 125, 0x03), + (1, 60, 0x02), + (22, 60, 0x03), + (1, 96, 0x02), + (22, 96, 0x03), + (1, 123, 0x02), + (22, 123, 0x03), + (96, 0, 0x00), + (110, 0, 0x00), + ], + // 91 + [ + (3, 94, 0x02), + (6, 94, 0x02), + (10, 94, 0x02), + (15, 94, 0x02), + (24, 94, 0x02), + (31, 94, 0x02), + (41, 94, 0x02), + (56, 94, 0x03), + (3, 125, 0x02), + (6, 125, 0x02), + (10, 125, 0x02), + (15, 125, 0x02), + (24, 125, 0x02), + (31, 125, 0x02), + (41, 125, 0x02), + (56, 125, 0x03), + ], + // 92 + [ + (2, 60, 0x02), + (9, 60, 0x02), + (23, 60, 0x02), + (40, 60, 0x03), + (2, 96, 0x02), + (9, 96, 0x02), + (23, 96, 0x02), + (40, 96, 0x03), + (2, 123, 0x02), + (9, 123, 0x02), + (23, 123, 0x02), + (40, 123, 0x03), + (97, 0, 0x00), + (101, 0, 0x00), + (111, 0, 0x00), + (133, 0, 0x00), + ], + // 93 + [ + (3, 60, 0x02), + (6, 60, 0x02), + (10, 60, 0x02), + (15, 60, 0x02), + (24, 60, 0x02), + (31, 60, 0x02), + (41, 60, 0x02), + (56, 60, 0x03), + (3, 96, 0x02), + (6, 96, 0x02), + (10, 96, 0x02), + (15, 96, 0x02), + (24, 96, 0x02), + (31, 96, 0x02), + (41, 96, 0x02), + (56, 96, 0x03), + ], + // 94 + [ + (3, 123, 0x02), + (6, 123, 0x02), + (10, 123, 0x02), + (15, 123, 0x02), + (24, 123, 0x02), + (31, 123, 0x02), + (41, 123, 0x02), + (56, 123, 0x03), + (98, 0, 0x00), + (99, 0, 0x00), + (102, 0, 0x00), + (105, 0, 0x00), + (112, 0, 0x00), + (119, 0, 0x00), + (134, 0, 0x00), + (153, 0, 0x00), + ], + // 95 + [ + (0, 92, 0x02), + (0, 195, 0x02), + (0, 208, 0x02), + (100, 0, 0x00), + (103, 0, 0x00), + (104, 0, 0x00), + (106, 0, 0x00), + (107, 0, 0x00), + (113, 0, 0x00), + (116, 0, 0x00), + (120, 0, 0x00), + (126, 0, 0x00), + (135, 0, 0x00), + (142, 0, 0x00), + (154, 0, 0x00), + (169, 0, 0x00), + ], + // 96 + [ + (1, 92, 0x02), + (22, 92, 0x03), + (1, 195, 0x02), + (22, 195, 0x03), + (1, 208, 0x02), + (22, 208, 0x03), + (0, 128, 0x02), + (0, 130, 0x02), + (0, 131, 0x02), + (0, 162, 0x02), + (0, 184, 0x02), + (0, 194, 0x02), + (0, 224, 0x02), + (0, 226, 0x02), + (108, 0, 0x00), + (109, 0, 0x00), + ], + // 97 + [ + (2, 92, 0x02), + (9, 92, 0x02), + (23, 92, 0x02), + (40, 92, 0x03), + (2, 195, 0x02), + (9, 195, 0x02), + (23, 195, 0x02), + (40, 195, 0x03), + (2, 208, 0x02), + (9, 208, 0x02), + (23, 208, 0x02), + (40, 208, 0x03), + (1, 128, 0x02), + (22, 128, 0x03), + (1, 130, 0x02), + (22, 130, 0x03), + ], + // 98 + [ + (3, 92, 0x02), + (6, 92, 0x02), + (10, 92, 0x02), + (15, 92, 0x02), + (24, 92, 0x02), + (31, 92, 0x02), + (41, 92, 0x02), + (56, 92, 0x03), + (3, 195, 0x02), + (6, 195, 0x02), + (10, 195, 0x02), + (15, 195, 0x02), + (24, 195, 0x02), + (31, 195, 0x02), + (41, 195, 0x02), + (56, 195, 0x03), + ], + // 99 + [ + (3, 208, 0x02), + (6, 208, 0x02), + (10, 208, 0x02), + (15, 208, 0x02), + (24, 208, 0x02), + (31, 208, 0x02), + (41, 208, 0x02), + (56, 208, 0x03), + (2, 128, 0x02), + (9, 128, 0x02), + (23, 128, 0x02), + (40, 128, 0x03), + (2, 130, 0x02), + (9, 130, 0x02), + (23, 130, 0x02), + (40, 130, 0x03), + ], + // 100 + [ + (3, 128, 0x02), + (6, 128, 0x02), + (10, 128, 0x02), + (15, 128, 0x02), + (24, 128, 0x02), + (31, 128, 0x02), + (41, 128, 0x02), + (56, 128, 0x03), + (3, 130, 0x02), + (6, 130, 0x02), + (10, 130, 0x02), + (15, 130, 0x02), + (24, 130, 0x02), + (31, 130, 0x02), + (41, 130, 0x02), + (56, 130, 0x03), + ], + // 101 + [ + (1, 131, 0x02), + (22, 131, 0x03), + (1, 162, 0x02), + (22, 162, 0x03), + (1, 184, 0x02), + (22, 184, 0x03), + (1, 194, 0x02), + (22, 194, 0x03), + (1, 224, 0x02), + (22, 224, 0x03), + (1, 226, 0x02), + (22, 226, 0x03), + (0, 153, 0x02), + (0, 161, 0x02), + (0, 167, 0x02), + (0, 172, 0x02), + ], + // 102 + [ + (2, 131, 0x02), + (9, 131, 0x02), + (23, 131, 0x02), + (40, 131, 0x03), + (2, 162, 0x02), + (9, 162, 0x02), + (23, 162, 0x02), + (40, 162, 0x03), + (2, 184, 0x02), + (9, 184, 0x02), + (23, 184, 0x02), + (40, 184, 0x03), + (2, 194, 0x02), + (9, 194, 0x02), + (23, 194, 0x02), + (40, 194, 0x03), + ], + // 103 + [ + (3, 131, 0x02), + (6, 131, 0x02), + (10, 131, 0x02), + (15, 131, 0x02), + (24, 131, 0x02), + (31, 131, 0x02), + (41, 131, 0x02), + (56, 131, 0x03), + (3, 162, 0x02), + (6, 162, 0x02), + (10, 162, 0x02), + (15, 162, 0x02), + (24, 162, 0x02), + (31, 162, 0x02), + (41, 162, 0x02), + (56, 162, 0x03), + ], + // 104 + [ + (3, 184, 0x02), + (6, 184, 0x02), + (10, 184, 0x02), + (15, 184, 0x02), + (24, 184, 0x02), + (31, 184, 0x02), + (41, 184, 0x02), + (56, 184, 0x03), + (3, 194, 0x02), + (6, 194, 0x02), + (10, 194, 0x02), + (15, 194, 0x02), + (24, 194, 0x02), + (31, 194, 0x02), + (41, 194, 0x02), + (56, 194, 0x03), + ], + // 105 + [ + (2, 224, 0x02), + (9, 224, 0x02), + (23, 224, 0x02), + (40, 224, 0x03), + (2, 226, 0x02), + (9, 226, 0x02), + (23, 226, 0x02), + (40, 226, 0x03), + (1, 153, 0x02), + (22, 153, 0x03), + (1, 161, 0x02), + (22, 161, 0x03), + (1, 167, 0x02), + (22, 167, 0x03), + (1, 172, 0x02), + (22, 172, 0x03), + ], + // 106 + [ + (3, 224, 0x02), + (6, 224, 0x02), + (10, 224, 0x02), + (15, 224, 0x02), + (24, 224, 0x02), + (31, 224, 0x02), + (41, 224, 0x02), + (56, 224, 0x03), + (3, 226, 0x02), + (6, 226, 0x02), + (10, 226, 0x02), + (15, 226, 0x02), + (24, 226, 0x02), + (31, 226, 0x02), + (41, 226, 0x02), + (56, 226, 0x03), + ], + // 107 + [ + (2, 153, 0x02), + (9, 153, 0x02), + (23, 153, 0x02), + (40, 153, 0x03), + (2, 161, 0x02), + (9, 161, 0x02), + (23, 161, 0x02), + (40, 161, 0x03), + (2, 167, 0x02), + (9, 167, 0x02), + (23, 167, 0x02), + (40, 167, 0x03), + (2, 172, 0x02), + (9, 172, 0x02), + (23, 172, 0x02), + (40, 172, 0x03), + ], + // 108 + [ + (3, 153, 0x02), + (6, 153, 0x02), + (10, 153, 0x02), + (15, 153, 0x02), + (24, 153, 0x02), + (31, 153, 0x02), + (41, 153, 0x02), + (56, 153, 0x03), + (3, 161, 0x02), + (6, 161, 0x02), + (10, 161, 0x02), + (15, 161, 0x02), + (24, 161, 0x02), + (31, 161, 0x02), + (41, 161, 0x02), + (56, 161, 0x03), + ], + // 109 + [ + (3, 167, 0x02), + (6, 167, 0x02), + (10, 167, 0x02), + (15, 167, 0x02), + (24, 167, 0x02), + (31, 167, 0x02), + (41, 167, 0x02), + (56, 167, 0x03), + (3, 172, 0x02), + (6, 172, 0x02), + (10, 172, 0x02), + (15, 172, 0x02), + (24, 172, 0x02), + (31, 172, 0x02), + (41, 172, 0x02), + (56, 172, 0x03), + ], + // 110 + [ + (114, 0, 0x00), + (115, 0, 0x00), + (117, 0, 0x00), + (118, 0, 0x00), + (121, 0, 0x00), + (123, 0, 0x00), + (127, 0, 0x00), + (130, 0, 0x00), + (136, 0, 0x00), + (139, 0, 0x00), + (143, 0, 0x00), + (146, 0, 0x00), + (155, 0, 0x00), + (162, 0, 0x00), + (170, 0, 0x00), + (180, 0, 0x00), + ], + // 111 + [ + (0, 176, 0x02), + (0, 177, 0x02), + (0, 179, 0x02), + (0, 209, 0x02), + (0, 216, 0x02), + (0, 217, 0x02), + (0, 227, 0x02), + (0, 229, 0x02), + (0, 230, 0x02), + (122, 0, 0x00), + (124, 0, 0x00), + (125, 0, 0x00), + (128, 0, 0x00), + (129, 0, 0x00), + (131, 0, 0x00), + (132, 0, 0x00), + ], + // 112 + [ + (1, 176, 0x02), + (22, 176, 0x03), + (1, 177, 0x02), + (22, 177, 0x03), + (1, 179, 0x02), + (22, 179, 0x03), + (1, 209, 0x02), + (22, 209, 0x03), + (1, 216, 0x02), + (22, 216, 0x03), + (1, 217, 0x02), + (22, 217, 0x03), + (1, 227, 0x02), + (22, 227, 0x03), + (1, 229, 0x02), + (22, 229, 0x03), + ], + // 113 + [ + (2, 176, 0x02), + (9, 176, 0x02), + (23, 176, 0x02), + (40, 176, 0x03), + (2, 177, 0x02), + (9, 177, 0x02), + (23, 177, 0x02), + (40, 177, 0x03), + (2, 179, 0x02), + (9, 179, 0x02), + (23, 179, 0x02), + (40, 179, 0x03), + (2, 209, 0x02), + (9, 209, 0x02), + (23, 209, 0x02), + (40, 209, 0x03), + ], + // 114 + [ + (3, 176, 0x02), + (6, 176, 0x02), + (10, 176, 0x02), + (15, 176, 0x02), + (24, 176, 0x02), + (31, 176, 0x02), + (41, 176, 0x02), + (56, 176, 0x03), + (3, 177, 0x02), + (6, 177, 0x02), + (10, 177, 0x02), + (15, 177, 0x02), + (24, 177, 0x02), + (31, 177, 0x02), + (41, 177, 0x02), + (56, 177, 0x03), + ], + // 115 + [ + (3, 179, 0x02), + (6, 179, 0x02), + (10, 179, 0x02), + (15, 179, 0x02), + (24, 179, 0x02), + (31, 179, 0x02), + (41, 179, 0x02), + (56, 179, 0x03), + (3, 209, 0x02), + (6, 209, 0x02), + (10, 209, 0x02), + (15, 209, 0x02), + (24, 209, 0x02), + (31, 209, 0x02), + (41, 209, 0x02), + (56, 209, 0x03), + ], + // 116 + [ + (2, 216, 0x02), + (9, 216, 0x02), + (23, 216, 0x02), + (40, 216, 0x03), + (2, 217, 0x02), + (9, 217, 0x02), + (23, 217, 0x02), + (40, 217, 0x03), + (2, 227, 0x02), + (9, 227, 0x02), + (23, 227, 0x02), + (40, 227, 0x03), + (2, 229, 0x02), + (9, 229, 0x02), + (23, 229, 0x02), + (40, 229, 0x03), + ], + // 117 + [ + (3, 216, 0x02), + (6, 216, 0x02), + (10, 216, 0x02), + (15, 216, 0x02), + (24, 216, 0x02), + (31, 216, 0x02), + (41, 216, 0x02), + (56, 216, 0x03), + (3, 217, 0x02), + (6, 217, 0x02), + (10, 217, 0x02), + (15, 217, 0x02), + (24, 217, 0x02), + (31, 217, 0x02), + (41, 217, 0x02), + (56, 217, 0x03), + ], + // 118 + [ + (3, 227, 0x02), + (6, 227, 0x02), + (10, 227, 0x02), + (15, 227, 0x02), + (24, 227, 0x02), + (31, 227, 0x02), + (41, 227, 0x02), + (56, 227, 0x03), + (3, 229, 0x02), + (6, 229, 0x02), + (10, 229, 0x02), + (15, 229, 0x02), + (24, 229, 0x02), + (31, 229, 0x02), + (41, 229, 0x02), + (56, 229, 0x03), + ], + // 119 + [ + (1, 230, 0x02), + (22, 230, 0x03), + (0, 129, 0x02), + (0, 132, 0x02), + (0, 133, 0x02), + (0, 134, 0x02), + (0, 136, 0x02), + (0, 146, 0x02), + (0, 154, 0x02), + (0, 156, 0x02), + (0, 160, 0x02), + (0, 163, 0x02), + (0, 164, 0x02), + (0, 169, 0x02), + (0, 170, 0x02), + (0, 173, 0x02), + ], + // 120 + [ + (2, 230, 0x02), + (9, 230, 0x02), + (23, 230, 0x02), + (40, 230, 0x03), + (1, 129, 0x02), + (22, 129, 0x03), + (1, 132, 0x02), + (22, 132, 0x03), + (1, 133, 0x02), + (22, 133, 0x03), + (1, 134, 0x02), + (22, 134, 0x03), + (1, 136, 0x02), + (22, 136, 0x03), + (1, 146, 0x02), + (22, 146, 0x03), + ], + // 121 + [ + (3, 230, 0x02), + (6, 230, 0x02), + (10, 230, 0x02), + (15, 230, 0x02), + (24, 230, 0x02), + (31, 230, 0x02), + (41, 230, 0x02), + (56, 230, 0x03), + (2, 129, 0x02), + (9, 129, 0x02), + (23, 129, 0x02), + (40, 129, 0x03), + (2, 132, 0x02), + (9, 132, 0x02), + (23, 132, 0x02), + (40, 132, 0x03), + ], + // 122 + [ + (3, 129, 0x02), + (6, 129, 0x02), + (10, 129, 0x02), + (15, 129, 0x02), + (24, 129, 0x02), + (31, 129, 0x02), + (41, 129, 0x02), + (56, 129, 0x03), + (3, 132, 0x02), + (6, 132, 0x02), + (10, 132, 0x02), + (15, 132, 0x02), + (24, 132, 0x02), + (31, 132, 0x02), + (41, 132, 0x02), + (56, 132, 0x03), + ], + // 123 + [ + (2, 133, 0x02), + (9, 133, 0x02), + (23, 133, 0x02), + (40, 133, 0x03), + (2, 134, 0x02), + (9, 134, 0x02), + (23, 134, 0x02), + (40, 134, 0x03), + (2, 136, 0x02), + (9, 136, 0x02), + (23, 136, 0x02), + (40, 136, 0x03), + (2, 146, 0x02), + (9, 146, 0x02), + (23, 146, 0x02), + (40, 146, 0x03), + ], + // 124 + [ + (3, 133, 0x02), + (6, 133, 0x02), + (10, 133, 0x02), + (15, 133, 0x02), + (24, 133, 0x02), + (31, 133, 0x02), + (41, 133, 0x02), + (56, 133, 0x03), + (3, 134, 0x02), + (6, 134, 0x02), + (10, 134, 0x02), + (15, 134, 0x02), + (24, 134, 0x02), + (31, 134, 0x02), + (41, 134, 0x02), + (56, 134, 0x03), + ], + // 125 + [ + (3, 136, 0x02), + (6, 136, 0x02), + (10, 136, 0x02), + (15, 136, 0x02), + (24, 136, 0x02), + (31, 136, 0x02), + (41, 136, 0x02), + (56, 136, 0x03), + (3, 146, 0x02), + (6, 146, 0x02), + (10, 146, 0x02), + (15, 146, 0x02), + (24, 146, 0x02), + (31, 146, 0x02), + (41, 146, 0x02), + (56, 146, 0x03), + ], + // 126 + [ + (1, 154, 0x02), + (22, 154, 0x03), + (1, 156, 0x02), + (22, 156, 0x03), + (1, 160, 0x02), + (22, 160, 0x03), + (1, 163, 0x02), + (22, 163, 0x03), + (1, 164, 0x02), + (22, 164, 0x03), + (1, 169, 0x02), + (22, 169, 0x03), + (1, 170, 0x02), + (22, 170, 0x03), + (1, 173, 0x02), + (22, 173, 0x03), + ], + // 127 + [ + (2, 154, 0x02), + (9, 154, 0x02), + (23, 154, 0x02), + (40, 154, 0x03), + (2, 156, 0x02), + (9, 156, 0x02), + (23, 156, 0x02), + (40, 156, 0x03), + (2, 160, 0x02), + (9, 160, 0x02), + (23, 160, 0x02), + (40, 160, 0x03), + (2, 163, 0x02), + (9, 163, 0x02), + (23, 163, 0x02), + (40, 163, 0x03), + ], + // 128 + [ + (3, 154, 0x02), + (6, 154, 0x02), + (10, 154, 0x02), + (15, 154, 0x02), + (24, 154, 0x02), + (31, 154, 0x02), + (41, 154, 0x02), + (56, 154, 0x03), + (3, 156, 0x02), + (6, 156, 0x02), + (10, 156, 0x02), + (15, 156, 0x02), + (24, 156, 0x02), + (31, 156, 0x02), + (41, 156, 0x02), + (56, 156, 0x03), + ], + // 129 + [ + (3, 160, 0x02), + (6, 160, 0x02), + (10, 160, 0x02), + (15, 160, 0x02), + (24, 160, 0x02), + (31, 160, 0x02), + (41, 160, 0x02), + (56, 160, 0x03), + (3, 163, 0x02), + (6, 163, 0x02), + (10, 163, 0x02), + (15, 163, 0x02), + (24, 163, 0x02), + (31, 163, 0x02), + (41, 163, 0x02), + (56, 163, 0x03), + ], + // 130 + [ + (2, 164, 0x02), + (9, 164, 0x02), + (23, 164, 0x02), + (40, 164, 0x03), + (2, 169, 0x02), + (9, 169, 0x02), + (23, 169, 0x02), + (40, 169, 0x03), + (2, 170, 0x02), + (9, 170, 0x02), + (23, 170, 0x02), + (40, 170, 0x03), + (2, 173, 0x02), + (9, 173, 0x02), + (23, 173, 0x02), + (40, 173, 0x03), + ], + // 131 + [ + (3, 164, 0x02), + (6, 164, 0x02), + (10, 164, 0x02), + (15, 164, 0x02), + (24, 164, 0x02), + (31, 164, 0x02), + (41, 164, 0x02), + (56, 164, 0x03), + (3, 169, 0x02), + (6, 169, 0x02), + (10, 169, 0x02), + (15, 169, 0x02), + (24, 169, 0x02), + (31, 169, 0x02), + (41, 169, 0x02), + (56, 169, 0x03), + ], + // 132 + [ + (3, 170, 0x02), + (6, 170, 0x02), + (10, 170, 0x02), + (15, 170, 0x02), + (24, 170, 0x02), + (31, 170, 0x02), + (41, 170, 0x02), + (56, 170, 0x03), + (3, 173, 0x02), + (6, 173, 0x02), + (10, 173, 0x02), + (15, 173, 0x02), + (24, 173, 0x02), + (31, 173, 0x02), + (41, 173, 0x02), + (56, 173, 0x03), + ], + // 133 + [ + (137, 0, 0x00), + (138, 0, 0x00), + (140, 0, 0x00), + (141, 0, 0x00), + (144, 0, 0x00), + (145, 0, 0x00), + (147, 0, 0x00), + (150, 0, 0x00), + (156, 0, 0x00), + (159, 0, 0x00), + (163, 0, 0x00), + (166, 0, 0x00), + (171, 0, 0x00), + (174, 0, 0x00), + (181, 0, 0x00), + (190, 0, 0x00), + ], + // 134 + [ + (0, 178, 0x02), + (0, 181, 0x02), + (0, 185, 0x02), + (0, 186, 0x02), + (0, 187, 0x02), + (0, 189, 0x02), + (0, 190, 0x02), + (0, 196, 0x02), + (0, 198, 0x02), + (0, 228, 0x02), + (0, 232, 0x02), + (0, 233, 0x02), + (148, 0, 0x00), + (149, 0, 0x00), + (151, 0, 0x00), + (152, 0, 0x00), + ], + // 135 + [ + (1, 178, 0x02), + (22, 178, 0x03), + (1, 181, 0x02), + (22, 181, 0x03), + (1, 185, 0x02), + (22, 185, 0x03), + (1, 186, 0x02), + (22, 186, 0x03), + (1, 187, 0x02), + (22, 187, 0x03), + (1, 189, 0x02), + (22, 189, 0x03), + (1, 190, 0x02), + (22, 190, 0x03), + (1, 196, 0x02), + (22, 196, 0x03), + ], + // 136 + [ + (2, 178, 0x02), + (9, 178, 0x02), + (23, 178, 0x02), + (40, 178, 0x03), + (2, 181, 0x02), + (9, 181, 0x02), + (23, 181, 0x02), + (40, 181, 0x03), + (2, 185, 0x02), + (9, 185, 0x02), + (23, 185, 0x02), + (40, 185, 0x03), + (2, 186, 0x02), + (9, 186, 0x02), + (23, 186, 0x02), + (40, 186, 0x03), + ], + // 137 + [ + (3, 178, 0x02), + (6, 178, 0x02), + (10, 178, 0x02), + (15, 178, 0x02), + (24, 178, 0x02), + (31, 178, 0x02), + (41, 178, 0x02), + (56, 178, 0x03), + (3, 181, 0x02), + (6, 181, 0x02), + (10, 181, 0x02), + (15, 181, 0x02), + (24, 181, 0x02), + (31, 181, 0x02), + (41, 181, 0x02), + (56, 181, 0x03), + ], + // 138 + [ + (3, 185, 0x02), + (6, 185, 0x02), + (10, 185, 0x02), + (15, 185, 0x02), + (24, 185, 0x02), + (31, 185, 0x02), + (41, 185, 0x02), + (56, 185, 0x03), + (3, 186, 0x02), + (6, 186, 0x02), + (10, 186, 0x02), + (15, 186, 0x02), + (24, 186, 0x02), + (31, 186, 0x02), + (41, 186, 0x02), + (56, 186, 0x03), + ], + // 139 + [ + (2, 187, 0x02), + (9, 187, 0x02), + (23, 187, 0x02), + (40, 187, 0x03), + (2, 189, 0x02), + (9, 189, 0x02), + (23, 189, 0x02), + (40, 189, 0x03), + (2, 190, 0x02), + (9, 190, 0x02), + (23, 190, 0x02), + (40, 190, 0x03), + (2, 196, 0x02), + (9, 196, 0x02), + (23, 196, 0x02), + (40, 196, 0x03), + ], + // 140 + [ + (3, 187, 0x02), + (6, 187, 0x02), + (10, 187, 0x02), + (15, 187, 0x02), + (24, 187, 0x02), + (31, 187, 0x02), + (41, 187, 0x02), + (56, 187, 0x03), + (3, 189, 0x02), + (6, 189, 0x02), + (10, 189, 0x02), + (15, 189, 0x02), + (24, 189, 0x02), + (31, 189, 0x02), + (41, 189, 0x02), + (56, 189, 0x03), + ], + // 141 + [ + (3, 190, 0x02), + (6, 190, 0x02), + (10, 190, 0x02), + (15, 190, 0x02), + (24, 190, 0x02), + (31, 190, 0x02), + (41, 190, 0x02), + (56, 190, 0x03), + (3, 196, 0x02), + (6, 196, 0x02), + (10, 196, 0x02), + (15, 196, 0x02), + (24, 196, 0x02), + (31, 196, 0x02), + (41, 196, 0x02), + (56, 196, 0x03), + ], + // 142 + [ + (1, 198, 0x02), + (22, 198, 0x03), + (1, 228, 0x02), + (22, 228, 0x03), + (1, 232, 0x02), + (22, 232, 0x03), + (1, 233, 0x02), + (22, 233, 0x03), + (0, 1, 0x02), + (0, 135, 0x02), + (0, 137, 0x02), + (0, 138, 0x02), + (0, 139, 0x02), + (0, 140, 0x02), + (0, 141, 0x02), + (0, 143, 0x02), + ], + // 143 + [ + (2, 198, 0x02), + (9, 198, 0x02), + (23, 198, 0x02), + (40, 198, 0x03), + (2, 228, 0x02), + (9, 228, 0x02), + (23, 228, 0x02), + (40, 228, 0x03), + (2, 232, 0x02), + (9, 232, 0x02), + (23, 232, 0x02), + (40, 232, 0x03), + (2, 233, 0x02), + (9, 233, 0x02), + (23, 233, 0x02), + (40, 233, 0x03), + ], + // 144 + [ + (3, 198, 0x02), + (6, 198, 0x02), + (10, 198, 0x02), + (15, 198, 0x02), + (24, 198, 0x02), + (31, 198, 0x02), + (41, 198, 0x02), + (56, 198, 0x03), + (3, 228, 0x02), + (6, 228, 0x02), + (10, 228, 0x02), + (15, 228, 0x02), + (24, 228, 0x02), + (31, 228, 0x02), + (41, 228, 0x02), + (56, 228, 0x03), + ], + // 145 + [ + (3, 232, 0x02), + (6, 232, 0x02), + (10, 232, 0x02), + (15, 232, 0x02), + (24, 232, 0x02), + (31, 232, 0x02), + (41, 232, 0x02), + (56, 232, 0x03), + (3, 233, 0x02), + (6, 233, 0x02), + (10, 233, 0x02), + (15, 233, 0x02), + (24, 233, 0x02), + (31, 233, 0x02), + (41, 233, 0x02), + (56, 233, 0x03), + ], + // 146 + [ + (1, 1, 0x02), + (22, 1, 0x03), + (1, 135, 0x02), + (22, 135, 0x03), + (1, 137, 0x02), + (22, 137, 0x03), + (1, 138, 0x02), + (22, 138, 0x03), + (1, 139, 0x02), + (22, 139, 0x03), + (1, 140, 0x02), + (22, 140, 0x03), + (1, 141, 0x02), + (22, 141, 0x03), + (1, 143, 0x02), + (22, 143, 0x03), + ], + // 147 + [ + (2, 1, 0x02), + (9, 1, 0x02), + (23, 1, 0x02), + (40, 1, 0x03), + (2, 135, 0x02), + (9, 135, 0x02), + (23, 135, 0x02), + (40, 135, 0x03), + (2, 137, 0x02), + (9, 137, 0x02), + (23, 137, 0x02), + (40, 137, 0x03), + (2, 138, 0x02), + (9, 138, 0x02), + (23, 138, 0x02), + (40, 138, 0x03), + ], + // 148 + [ + (3, 1, 0x02), + (6, 1, 0x02), + (10, 1, 0x02), + (15, 1, 0x02), + (24, 1, 0x02), + (31, 1, 0x02), + (41, 1, 0x02), + (56, 1, 0x03), + (3, 135, 0x02), + (6, 135, 0x02), + (10, 135, 0x02), + (15, 135, 0x02), + (24, 135, 0x02), + (31, 135, 0x02), + (41, 135, 0x02), + (56, 135, 0x03), + ], + // 149 + [ + (3, 137, 0x02), + (6, 137, 0x02), + (10, 137, 0x02), + (15, 137, 0x02), + (24, 137, 0x02), + (31, 137, 0x02), + (41, 137, 0x02), + (56, 137, 0x03), + (3, 138, 0x02), + (6, 138, 0x02), + (10, 138, 0x02), + (15, 138, 0x02), + (24, 138, 0x02), + (31, 138, 0x02), + (41, 138, 0x02), + (56, 138, 0x03), + ], + // 150 + [ + (2, 139, 0x02), + (9, 139, 0x02), + (23, 139, 0x02), + (40, 139, 0x03), + (2, 140, 0x02), + (9, 140, 0x02), + (23, 140, 0x02), + (40, 140, 0x03), + (2, 141, 0x02), + (9, 141, 0x02), + (23, 141, 0x02), + (40, 141, 0x03), + (2, 143, 0x02), + (9, 143, 0x02), + (23, 143, 0x02), + (40, 143, 0x03), + ], + // 151 + [ + (3, 139, 0x02), + (6, 139, 0x02), + (10, 139, 0x02), + (15, 139, 0x02), + (24, 139, 0x02), + (31, 139, 0x02), + (41, 139, 0x02), + (56, 139, 0x03), + (3, 140, 0x02), + (6, 140, 0x02), + (10, 140, 0x02), + (15, 140, 0x02), + (24, 140, 0x02), + (31, 140, 0x02), + (41, 140, 0x02), + (56, 140, 0x03), + ], + // 152 + [ + (3, 141, 0x02), + (6, 141, 0x02), + (10, 141, 0x02), + (15, 141, 0x02), + (24, 141, 0x02), + (31, 141, 0x02), + (41, 141, 0x02), + (56, 141, 0x03), + (3, 143, 0x02), + (6, 143, 0x02), + (10, 143, 0x02), + (15, 143, 0x02), + (24, 143, 0x02), + (31, 143, 0x02), + (41, 143, 0x02), + (56, 143, 0x03), + ], + // 153 + [ + (157, 0, 0x00), + (158, 0, 0x00), + (160, 0, 0x00), + (161, 0, 0x00), + (164, 0, 0x00), + (165, 0, 0x00), + (167, 0, 0x00), + (168, 0, 0x00), + (172, 0, 0x00), + (173, 0, 0x00), + (175, 0, 0x00), + (177, 0, 0x00), + (182, 0, 0x00), + (185, 0, 0x00), + (191, 0, 0x00), + (207, 0, 0x00), + ], + // 154 + [ + (0, 147, 0x02), + (0, 149, 0x02), + (0, 150, 0x02), + (0, 151, 0x02), + (0, 152, 0x02), + (0, 155, 0x02), + (0, 157, 0x02), + (0, 158, 0x02), + (0, 165, 0x02), + (0, 166, 0x02), + (0, 168, 0x02), + (0, 174, 0x02), + (0, 175, 0x02), + (0, 180, 0x02), + (0, 182, 0x02), + (0, 183, 0x02), + ], + // 155 + [ + (1, 147, 0x02), + (22, 147, 0x03), + (1, 149, 0x02), + (22, 149, 0x03), + (1, 150, 0x02), + (22, 150, 0x03), + (1, 151, 0x02), + (22, 151, 0x03), + (1, 152, 0x02), + (22, 152, 0x03), + (1, 155, 0x02), + (22, 155, 0x03), + (1, 157, 0x02), + (22, 157, 0x03), + (1, 158, 0x02), + (22, 158, 0x03), + ], + // 156 + [ + (2, 147, 0x02), + (9, 147, 0x02), + (23, 147, 0x02), + (40, 147, 0x03), + (2, 149, 0x02), + (9, 149, 0x02), + (23, 149, 0x02), + (40, 149, 0x03), + (2, 150, 0x02), + (9, 150, 0x02), + (23, 150, 0x02), + (40, 150, 0x03), + (2, 151, 0x02), + (9, 151, 0x02), + (23, 151, 0x02), + (40, 151, 0x03), + ], + // 157 + [ + (3, 147, 0x02), + (6, 147, 0x02), + (10, 147, 0x02), + (15, 147, 0x02), + (24, 147, 0x02), + (31, 147, 0x02), + (41, 147, 0x02), + (56, 147, 0x03), + (3, 149, 0x02), + (6, 149, 0x02), + (10, 149, 0x02), + (15, 149, 0x02), + (24, 149, 0x02), + (31, 149, 0x02), + (41, 149, 0x02), + (56, 149, 0x03), + ], + // 158 + [ + (3, 150, 0x02), + (6, 150, 0x02), + (10, 150, 0x02), + (15, 150, 0x02), + (24, 150, 0x02), + (31, 150, 0x02), + (41, 150, 0x02), + (56, 150, 0x03), + (3, 151, 0x02), + (6, 151, 0x02), + (10, 151, 0x02), + (15, 151, 0x02), + (24, 151, 0x02), + (31, 151, 0x02), + (41, 151, 0x02), + (56, 151, 0x03), + ], + // 159 + [ + (2, 152, 0x02), + (9, 152, 0x02), + (23, 152, 0x02), + (40, 152, 0x03), + (2, 155, 0x02), + (9, 155, 0x02), + (23, 155, 0x02), + (40, 155, 0x03), + (2, 157, 0x02), + (9, 157, 0x02), + (23, 157, 0x02), + (40, 157, 0x03), + (2, 158, 0x02), + (9, 158, 0x02), + (23, 158, 0x02), + (40, 158, 0x03), + ], + // 160 + [ + (3, 152, 0x02), + (6, 152, 0x02), + (10, 152, 0x02), + (15, 152, 0x02), + (24, 152, 0x02), + (31, 152, 0x02), + (41, 152, 0x02), + (56, 152, 0x03), + (3, 155, 0x02), + (6, 155, 0x02), + (10, 155, 0x02), + (15, 155, 0x02), + (24, 155, 0x02), + (31, 155, 0x02), + (41, 155, 0x02), + (56, 155, 0x03), + ], + // 161 + [ + (3, 157, 0x02), + (6, 157, 0x02), + (10, 157, 0x02), + (15, 157, 0x02), + (24, 157, 0x02), + (31, 157, 0x02), + (41, 157, 0x02), + (56, 157, 0x03), + (3, 158, 0x02), + (6, 158, 0x02), + (10, 158, 0x02), + (15, 158, 0x02), + (24, 158, 0x02), + (31, 158, 0x02), + (41, 158, 0x02), + (56, 158, 0x03), + ], + // 162 + [ + (1, 165, 0x02), + (22, 165, 0x03), + (1, 166, 0x02), + (22, 166, 0x03), + (1, 168, 0x02), + (22, 168, 0x03), + (1, 174, 0x02), + (22, 174, 0x03), + (1, 175, 0x02), + (22, 175, 0x03), + (1, 180, 0x02), + (22, 180, 0x03), + (1, 182, 0x02), + (22, 182, 0x03), + (1, 183, 0x02), + (22, 183, 0x03), + ], + // 163 + [ + (2, 165, 0x02), + (9, 165, 0x02), + (23, 165, 0x02), + (40, 165, 0x03), + (2, 166, 0x02), + (9, 166, 0x02), + (23, 166, 0x02), + (40, 166, 0x03), + (2, 168, 0x02), + (9, 168, 0x02), + (23, 168, 0x02), + (40, 168, 0x03), + (2, 174, 0x02), + (9, 174, 0x02), + (23, 174, 0x02), + (40, 174, 0x03), + ], + // 164 + [ + (3, 165, 0x02), + (6, 165, 0x02), + (10, 165, 0x02), + (15, 165, 0x02), + (24, 165, 0x02), + (31, 165, 0x02), + (41, 165, 0x02), + (56, 165, 0x03), + (3, 166, 0x02), + (6, 166, 0x02), + (10, 166, 0x02), + (15, 166, 0x02), + (24, 166, 0x02), + (31, 166, 0x02), + (41, 166, 0x02), + (56, 166, 0x03), + ], + // 165 + [ + (3, 168, 0x02), + (6, 168, 0x02), + (10, 168, 0x02), + (15, 168, 0x02), + (24, 168, 0x02), + (31, 168, 0x02), + (41, 168, 0x02), + (56, 168, 0x03), + (3, 174, 0x02), + (6, 174, 0x02), + (10, 174, 0x02), + (15, 174, 0x02), + (24, 174, 0x02), + (31, 174, 0x02), + (41, 174, 0x02), + (56, 174, 0x03), + ], + // 166 + [ + (2, 175, 0x02), + (9, 175, 0x02), + (23, 175, 0x02), + (40, 175, 0x03), + (2, 180, 0x02), + (9, 180, 0x02), + (23, 180, 0x02), + (40, 180, 0x03), + (2, 182, 0x02), + (9, 182, 0x02), + (23, 182, 0x02), + (40, 182, 0x03), + (2, 183, 0x02), + (9, 183, 0x02), + (23, 183, 0x02), + (40, 183, 0x03), + ], + // 167 + [ + (3, 175, 0x02), + (6, 175, 0x02), + (10, 175, 0x02), + (15, 175, 0x02), + (24, 175, 0x02), + (31, 175, 0x02), + (41, 175, 0x02), + (56, 175, 0x03), + (3, 180, 0x02), + (6, 180, 0x02), + (10, 180, 0x02), + (15, 180, 0x02), + (24, 180, 0x02), + (31, 180, 0x02), + (41, 180, 0x02), + (56, 180, 0x03), + ], + // 168 + [ + (3, 182, 0x02), + (6, 182, 0x02), + (10, 182, 0x02), + (15, 182, 0x02), + (24, 182, 0x02), + (31, 182, 0x02), + (41, 182, 0x02), + (56, 182, 0x03), + (3, 183, 0x02), + (6, 183, 0x02), + (10, 183, 0x02), + (15, 183, 0x02), + (24, 183, 0x02), + (31, 183, 0x02), + (41, 183, 0x02), + (56, 183, 0x03), + ], + // 169 + [ + (0, 188, 0x02), + (0, 191, 0x02), + (0, 197, 0x02), + (0, 231, 0x02), + (0, 239, 0x02), + (176, 0, 0x00), + (178, 0, 0x00), + (179, 0, 0x00), + (183, 0, 0x00), + (184, 0, 0x00), + (186, 0, 0x00), + (187, 0, 0x00), + (192, 0, 0x00), + (199, 0, 0x00), + (208, 0, 0x00), + (223, 0, 0x00), + ], + // 170 + [ + (1, 188, 0x02), + (22, 188, 0x03), + (1, 191, 0x02), + (22, 191, 0x03), + (1, 197, 0x02), + (22, 197, 0x03), + (1, 231, 0x02), + (22, 231, 0x03), + (1, 239, 0x02), + (22, 239, 0x03), + (0, 9, 0x02), + (0, 142, 0x02), + (0, 144, 0x02), + (0, 145, 0x02), + (0, 148, 0x02), + (0, 159, 0x02), + ], + // 171 + [ + (2, 188, 0x02), + (9, 188, 0x02), + (23, 188, 0x02), + (40, 188, 0x03), + (2, 191, 0x02), + (9, 191, 0x02), + (23, 191, 0x02), + (40, 191, 0x03), + (2, 197, 0x02), + (9, 197, 0x02), + (23, 197, 0x02), + (40, 197, 0x03), + (2, 231, 0x02), + (9, 231, 0x02), + (23, 231, 0x02), + (40, 231, 0x03), + ], + // 172 + [ + (3, 188, 0x02), + (6, 188, 0x02), + (10, 188, 0x02), + (15, 188, 0x02), + (24, 188, 0x02), + (31, 188, 0x02), + (41, 188, 0x02), + (56, 188, 0x03), + (3, 191, 0x02), + (6, 191, 0x02), + (10, 191, 0x02), + (15, 191, 0x02), + (24, 191, 0x02), + (31, 191, 0x02), + (41, 191, 0x02), + (56, 191, 0x03), + ], + // 173 + [ + (3, 197, 0x02), + (6, 197, 0x02), + (10, 197, 0x02), + (15, 197, 0x02), + (24, 197, 0x02), + (31, 197, 0x02), + (41, 197, 0x02), + (56, 197, 0x03), + (3, 231, 0x02), + (6, 231, 0x02), + (10, 231, 0x02), + (15, 231, 0x02), + (24, 231, 0x02), + (31, 231, 0x02), + (41, 231, 0x02), + (56, 231, 0x03), + ], + // 174 + [ + (2, 239, 0x02), + (9, 239, 0x02), + (23, 239, 0x02), + (40, 239, 0x03), + (1, 9, 0x02), + (22, 9, 0x03), + (1, 142, 0x02), + (22, 142, 0x03), + (1, 144, 0x02), + (22, 144, 0x03), + (1, 145, 0x02), + (22, 145, 0x03), + (1, 148, 0x02), + (22, 148, 0x03), + (1, 159, 0x02), + (22, 159, 0x03), + ], + // 175 + [ + (3, 239, 0x02), + (6, 239, 0x02), + (10, 239, 0x02), + (15, 239, 0x02), + (24, 239, 0x02), + (31, 239, 0x02), + (41, 239, 0x02), + (56, 239, 0x03), + (2, 9, 0x02), + (9, 9, 0x02), + (23, 9, 0x02), + (40, 9, 0x03), + (2, 142, 0x02), + (9, 142, 0x02), + (23, 142, 0x02), + (40, 142, 0x03), + ], + // 176 + [ + (3, 9, 0x02), + (6, 9, 0x02), + (10, 9, 0x02), + (15, 9, 0x02), + (24, 9, 0x02), + (31, 9, 0x02), + (41, 9, 0x02), + (56, 9, 0x03), + (3, 142, 0x02), + (6, 142, 0x02), + (10, 142, 0x02), + (15, 142, 0x02), + (24, 142, 0x02), + (31, 142, 0x02), + (41, 142, 0x02), + (56, 142, 0x03), + ], + // 177 + [ + (2, 144, 0x02), + (9, 144, 0x02), + (23, 144, 0x02), + (40, 144, 0x03), + (2, 145, 0x02), + (9, 145, 0x02), + (23, 145, 0x02), + (40, 145, 0x03), + (2, 148, 0x02), + (9, 148, 0x02), + (23, 148, 0x02), + (40, 148, 0x03), + (2, 159, 0x02), + (9, 159, 0x02), + (23, 159, 0x02), + (40, 159, 0x03), + ], + // 178 + [ + (3, 144, 0x02), + (6, 144, 0x02), + (10, 144, 0x02), + (15, 144, 0x02), + (24, 144, 0x02), + (31, 144, 0x02), + (41, 144, 0x02), + (56, 144, 0x03), + (3, 145, 0x02), + (6, 145, 0x02), + (10, 145, 0x02), + (15, 145, 0x02), + (24, 145, 0x02), + (31, 145, 0x02), + (41, 145, 0x02), + (56, 145, 0x03), + ], + // 179 + [ + (3, 148, 0x02), + (6, 148, 0x02), + (10, 148, 0x02), + (15, 148, 0x02), + (24, 148, 0x02), + (31, 148, 0x02), + (41, 148, 0x02), + (56, 148, 0x03), + (3, 159, 0x02), + (6, 159, 0x02), + (10, 159, 0x02), + (15, 159, 0x02), + (24, 159, 0x02), + (31, 159, 0x02), + (41, 159, 0x02), + (56, 159, 0x03), + ], + // 180 + [ + (0, 171, 0x02), + (0, 206, 0x02), + (0, 215, 0x02), + (0, 225, 0x02), + (0, 236, 0x02), + (0, 237, 0x02), + (188, 0, 0x00), + (189, 0, 0x00), + (193, 0, 0x00), + (196, 0, 0x00), + (200, 0, 0x00), + (203, 0, 0x00), + (209, 0, 0x00), + (216, 0, 0x00), + (224, 0, 0x00), + (238, 0, 0x00), + ], + // 181 + [ + (1, 171, 0x02), + (22, 171, 0x03), + (1, 206, 0x02), + (22, 206, 0x03), + (1, 215, 0x02), + (22, 215, 0x03), + (1, 225, 0x02), + (22, 225, 0x03), + (1, 236, 0x02), + (22, 236, 0x03), + (1, 237, 0x02), + (22, 237, 0x03), + (0, 199, 0x02), + (0, 207, 0x02), + (0, 234, 0x02), + (0, 235, 0x02), + ], + // 182 + [ + (2, 171, 0x02), + (9, 171, 0x02), + (23, 171, 0x02), + (40, 171, 0x03), + (2, 206, 0x02), + (9, 206, 0x02), + (23, 206, 0x02), + (40, 206, 0x03), + (2, 215, 0x02), + (9, 215, 0x02), + (23, 215, 0x02), + (40, 215, 0x03), + (2, 225, 0x02), + (9, 225, 0x02), + (23, 225, 0x02), + (40, 225, 0x03), + ], + // 183 + [ + (3, 171, 0x02), + (6, 171, 0x02), + (10, 171, 0x02), + (15, 171, 0x02), + (24, 171, 0x02), + (31, 171, 0x02), + (41, 171, 0x02), + (56, 171, 0x03), + (3, 206, 0x02), + (6, 206, 0x02), + (10, 206, 0x02), + (15, 206, 0x02), + (24, 206, 0x02), + (31, 206, 0x02), + (41, 206, 0x02), + (56, 206, 0x03), + ], + // 184 + [ + (3, 215, 0x02), + (6, 215, 0x02), + (10, 215, 0x02), + (15, 215, 0x02), + (24, 215, 0x02), + (31, 215, 0x02), + (41, 215, 0x02), + (56, 215, 0x03), + (3, 225, 0x02), + (6, 225, 0x02), + (10, 225, 0x02), + (15, 225, 0x02), + (24, 225, 0x02), + (31, 225, 0x02), + (41, 225, 0x02), + (56, 225, 0x03), + ], + // 185 + [ + (2, 236, 0x02), + (9, 236, 0x02), + (23, 236, 0x02), + (40, 236, 0x03), + (2, 237, 0x02), + (9, 237, 0x02), + (23, 237, 0x02), + (40, 237, 0x03), + (1, 199, 0x02), + (22, 199, 0x03), + (1, 207, 0x02), + (22, 207, 0x03), + (1, 234, 0x02), + (22, 234, 0x03), + (1, 235, 0x02), + (22, 235, 0x03), + ], + // 186 + [ + (3, 236, 0x02), + (6, 236, 0x02), + (10, 236, 0x02), + (15, 236, 0x02), + (24, 236, 0x02), + (31, 236, 0x02), + (41, 236, 0x02), + (56, 236, 0x03), + (3, 237, 0x02), + (6, 237, 0x02), + (10, 237, 0x02), + (15, 237, 0x02), + (24, 237, 0x02), + (31, 237, 0x02), + (41, 237, 0x02), + (56, 237, 0x03), + ], + // 187 + [ + (2, 199, 0x02), + (9, 199, 0x02), + (23, 199, 0x02), + (40, 199, 0x03), + (2, 207, 0x02), + (9, 207, 0x02), + (23, 207, 0x02), + (40, 207, 0x03), + (2, 234, 0x02), + (9, 234, 0x02), + (23, 234, 0x02), + (40, 234, 0x03), + (2, 235, 0x02), + (9, 235, 0x02), + (23, 235, 0x02), + (40, 235, 0x03), + ], + // 188 + [ + (3, 199, 0x02), + (6, 199, 0x02), + (10, 199, 0x02), + (15, 199, 0x02), + (24, 199, 0x02), + (31, 199, 0x02), + (41, 199, 0x02), + (56, 199, 0x03), + (3, 207, 0x02), + (6, 207, 0x02), + (10, 207, 0x02), + (15, 207, 0x02), + (24, 207, 0x02), + (31, 207, 0x02), + (41, 207, 0x02), + (56, 207, 0x03), + ], + // 189 + [ + (3, 234, 0x02), + (6, 234, 0x02), + (10, 234, 0x02), + (15, 234, 0x02), + (24, 234, 0x02), + (31, 234, 0x02), + (41, 234, 0x02), + (56, 234, 0x03), + (3, 235, 0x02), + (6, 235, 0x02), + (10, 235, 0x02), + (15, 235, 0x02), + (24, 235, 0x02), + (31, 235, 0x02), + (41, 235, 0x02), + (56, 235, 0x03), + ], + // 190 + [ + (194, 0, 0x00), + (195, 0, 0x00), + (197, 0, 0x00), + (198, 0, 0x00), + (201, 0, 0x00), + (202, 0, 0x00), + (204, 0, 0x00), + (205, 0, 0x00), + (210, 0, 0x00), + (213, 0, 0x00), + (217, 0, 0x00), + (220, 0, 0x00), + (225, 0, 0x00), + (231, 0, 0x00), + (239, 0, 0x00), + (246, 0, 0x00), + ], + // 191 + [ + (0, 192, 0x02), + (0, 193, 0x02), + (0, 200, 0x02), + (0, 201, 0x02), + (0, 202, 0x02), + (0, 205, 0x02), + (0, 210, 0x02), + (0, 213, 0x02), + (0, 218, 0x02), + (0, 219, 0x02), + (0, 238, 0x02), + (0, 240, 0x02), + (0, 242, 0x02), + (0, 243, 0x02), + (0, 255, 0x02), + (206, 0, 0x00), + ], + // 192 + [ + (1, 192, 0x02), + (22, 192, 0x03), + (1, 193, 0x02), + (22, 193, 0x03), + (1, 200, 0x02), + (22, 200, 0x03), + (1, 201, 0x02), + (22, 201, 0x03), + (1, 202, 0x02), + (22, 202, 0x03), + (1, 205, 0x02), + (22, 205, 0x03), + (1, 210, 0x02), + (22, 210, 0x03), + (1, 213, 0x02), + (22, 213, 0x03), + ], + // 193 + [ + (2, 192, 0x02), + (9, 192, 0x02), + (23, 192, 0x02), + (40, 192, 0x03), + (2, 193, 0x02), + (9, 193, 0x02), + (23, 193, 0x02), + (40, 193, 0x03), + (2, 200, 0x02), + (9, 200, 0x02), + (23, 200, 0x02), + (40, 200, 0x03), + (2, 201, 0x02), + (9, 201, 0x02), + (23, 201, 0x02), + (40, 201, 0x03), + ], + // 194 + [ + (3, 192, 0x02), + (6, 192, 0x02), + (10, 192, 0x02), + (15, 192, 0x02), + (24, 192, 0x02), + (31, 192, 0x02), + (41, 192, 0x02), + (56, 192, 0x03), + (3, 193, 0x02), + (6, 193, 0x02), + (10, 193, 0x02), + (15, 193, 0x02), + (24, 193, 0x02), + (31, 193, 0x02), + (41, 193, 0x02), + (56, 193, 0x03), + ], + // 195 + [ + (3, 200, 0x02), + (6, 200, 0x02), + (10, 200, 0x02), + (15, 200, 0x02), + (24, 200, 0x02), + (31, 200, 0x02), + (41, 200, 0x02), + (56, 200, 0x03), + (3, 201, 0x02), + (6, 201, 0x02), + (10, 201, 0x02), + (15, 201, 0x02), + (24, 201, 0x02), + (31, 201, 0x02), + (41, 201, 0x02), + (56, 201, 0x03), + ], + // 196 + [ + (2, 202, 0x02), + (9, 202, 0x02), + (23, 202, 0x02), + (40, 202, 0x03), + (2, 205, 0x02), + (9, 205, 0x02), + (23, 205, 0x02), + (40, 205, 0x03), + (2, 210, 0x02), + (9, 210, 0x02), + (23, 210, 0x02), + (40, 210, 0x03), + (2, 213, 0x02), + (9, 213, 0x02), + (23, 213, 0x02), + (40, 213, 0x03), + ], + // 197 + [ + (3, 202, 0x02), + (6, 202, 0x02), + (10, 202, 0x02), + (15, 202, 0x02), + (24, 202, 0x02), + (31, 202, 0x02), + (41, 202, 0x02), + (56, 202, 0x03), + (3, 205, 0x02), + (6, 205, 0x02), + (10, 205, 0x02), + (15, 205, 0x02), + (24, 205, 0x02), + (31, 205, 0x02), + (41, 205, 0x02), + (56, 205, 0x03), + ], + // 198 + [ + (3, 210, 0x02), + (6, 210, 0x02), + (10, 210, 0x02), + (15, 210, 0x02), + (24, 210, 0x02), + (31, 210, 0x02), + (41, 210, 0x02), + (56, 210, 0x03), + (3, 213, 0x02), + (6, 213, 0x02), + (10, 213, 0x02), + (15, 213, 0x02), + (24, 213, 0x02), + (31, 213, 0x02), + (41, 213, 0x02), + (56, 213, 0x03), + ], + // 199 + [ + (1, 218, 0x02), + (22, 218, 0x03), + (1, 219, 0x02), + (22, 219, 0x03), + (1, 238, 0x02), + (22, 238, 0x03), + (1, 240, 0x02), + (22, 240, 0x03), + (1, 242, 0x02), + (22, 242, 0x03), + (1, 243, 0x02), + (22, 243, 0x03), + (1, 255, 0x02), + (22, 255, 0x03), + (0, 203, 0x02), + (0, 204, 0x02), + ], + // 200 + [ + (2, 218, 0x02), + (9, 218, 0x02), + (23, 218, 0x02), + (40, 218, 0x03), + (2, 219, 0x02), + (9, 219, 0x02), + (23, 219, 0x02), + (40, 219, 0x03), + (2, 238, 0x02), + (9, 238, 0x02), + (23, 238, 0x02), + (40, 238, 0x03), + (2, 240, 0x02), + (9, 240, 0x02), + (23, 240, 0x02), + (40, 240, 0x03), + ], + // 201 + [ + (3, 218, 0x02), + (6, 218, 0x02), + (10, 218, 0x02), + (15, 218, 0x02), + (24, 218, 0x02), + (31, 218, 0x02), + (41, 218, 0x02), + (56, 218, 0x03), + (3, 219, 0x02), + (6, 219, 0x02), + (10, 219, 0x02), + (15, 219, 0x02), + (24, 219, 0x02), + (31, 219, 0x02), + (41, 219, 0x02), + (56, 219, 0x03), + ], + // 202 + [ + (3, 238, 0x02), + (6, 238, 0x02), + (10, 238, 0x02), + (15, 238, 0x02), + (24, 238, 0x02), + (31, 238, 0x02), + (41, 238, 0x02), + (56, 238, 0x03), + (3, 240, 0x02), + (6, 240, 0x02), + (10, 240, 0x02), + (15, 240, 0x02), + (24, 240, 0x02), + (31, 240, 0x02), + (41, 240, 0x02), + (56, 240, 0x03), + ], + // 203 + [ + (2, 242, 0x02), + (9, 242, 0x02), + (23, 242, 0x02), + (40, 242, 0x03), + (2, 243, 0x02), + (9, 243, 0x02), + (23, 243, 0x02), + (40, 243, 0x03), + (2, 255, 0x02), + (9, 255, 0x02), + (23, 255, 0x02), + (40, 255, 0x03), + (1, 203, 0x02), + (22, 203, 0x03), + (1, 204, 0x02), + (22, 204, 0x03), + ], + // 204 + [ + (3, 242, 0x02), + (6, 242, 0x02), + (10, 242, 0x02), + (15, 242, 0x02), + (24, 242, 0x02), + (31, 242, 0x02), + (41, 242, 0x02), + (56, 242, 0x03), + (3, 243, 0x02), + (6, 243, 0x02), + (10, 243, 0x02), + (15, 243, 0x02), + (24, 243, 0x02), + (31, 243, 0x02), + (41, 243, 0x02), + (56, 243, 0x03), + ], + // 205 + [ + (3, 255, 0x02), + (6, 255, 0x02), + (10, 255, 0x02), + (15, 255, 0x02), + (24, 255, 0x02), + (31, 255, 0x02), + (41, 255, 0x02), + (56, 255, 0x03), + (2, 203, 0x02), + (9, 203, 0x02), + (23, 203, 0x02), + (40, 203, 0x03), + (2, 204, 0x02), + (9, 204, 0x02), + (23, 204, 0x02), + (40, 204, 0x03), + ], + // 206 + [ + (3, 203, 0x02), + (6, 203, 0x02), + (10, 203, 0x02), + (15, 203, 0x02), + (24, 203, 0x02), + (31, 203, 0x02), + (41, 203, 0x02), + (56, 203, 0x03), + (3, 204, 0x02), + (6, 204, 0x02), + (10, 204, 0x02), + (15, 204, 0x02), + (24, 204, 0x02), + (31, 204, 0x02), + (41, 204, 0x02), + (56, 204, 0x03), + ], + // 207 + [ + (211, 0, 0x00), + (212, 0, 0x00), + (214, 0, 0x00), + (215, 0, 0x00), + (218, 0, 0x00), + (219, 0, 0x00), + (221, 0, 0x00), + (222, 0, 0x00), + (226, 0, 0x00), + (228, 0, 0x00), + (232, 0, 0x00), + (235, 0, 0x00), + (240, 0, 0x00), + (243, 0, 0x00), + (247, 0, 0x00), + (250, 0, 0x00), + ], + // 208 + [ + (0, 211, 0x02), + (0, 212, 0x02), + (0, 214, 0x02), + (0, 221, 0x02), + (0, 222, 0x02), + (0, 223, 0x02), + (0, 241, 0x02), + (0, 244, 0x02), + (0, 245, 0x02), + (0, 246, 0x02), + (0, 247, 0x02), + (0, 248, 0x02), + (0, 250, 0x02), + (0, 251, 0x02), + (0, 252, 0x02), + (0, 253, 0x02), + ], + // 209 + [ + (1, 211, 0x02), + (22, 211, 0x03), + (1, 212, 0x02), + (22, 212, 0x03), + (1, 214, 0x02), + (22, 214, 0x03), + (1, 221, 0x02), + (22, 221, 0x03), + (1, 222, 0x02), + (22, 222, 0x03), + (1, 223, 0x02), + (22, 223, 0x03), + (1, 241, 0x02), + (22, 241, 0x03), + (1, 244, 0x02), + (22, 244, 0x03), + ], + // 210 + [ + (2, 211, 0x02), + (9, 211, 0x02), + (23, 211, 0x02), + (40, 211, 0x03), + (2, 212, 0x02), + (9, 212, 0x02), + (23, 212, 0x02), + (40, 212, 0x03), + (2, 214, 0x02), + (9, 214, 0x02), + (23, 214, 0x02), + (40, 214, 0x03), + (2, 221, 0x02), + (9, 221, 0x02), + (23, 221, 0x02), + (40, 221, 0x03), + ], + // 211 + [ + (3, 211, 0x02), + (6, 211, 0x02), + (10, 211, 0x02), + (15, 211, 0x02), + (24, 211, 0x02), + (31, 211, 0x02), + (41, 211, 0x02), + (56, 211, 0x03), + (3, 212, 0x02), + (6, 212, 0x02), + (10, 212, 0x02), + (15, 212, 0x02), + (24, 212, 0x02), + (31, 212, 0x02), + (41, 212, 0x02), + (56, 212, 0x03), + ], + // 212 + [ + (3, 214, 0x02), + (6, 214, 0x02), + (10, 214, 0x02), + (15, 214, 0x02), + (24, 214, 0x02), + (31, 214, 0x02), + (41, 214, 0x02), + (56, 214, 0x03), + (3, 221, 0x02), + (6, 221, 0x02), + (10, 221, 0x02), + (15, 221, 0x02), + (24, 221, 0x02), + (31, 221, 0x02), + (41, 221, 0x02), + (56, 221, 0x03), + ], + // 213 + [ + (2, 222, 0x02), + (9, 222, 0x02), + (23, 222, 0x02), + (40, 222, 0x03), + (2, 223, 0x02), + (9, 223, 0x02), + (23, 223, 0x02), + (40, 223, 0x03), + (2, 241, 0x02), + (9, 241, 0x02), + (23, 241, 0x02), + (40, 241, 0x03), + (2, 244, 0x02), + (9, 244, 0x02), + (23, 244, 0x02), + (40, 244, 0x03), + ], + // 214 + [ + (3, 222, 0x02), + (6, 222, 0x02), + (10, 222, 0x02), + (15, 222, 0x02), + (24, 222, 0x02), + (31, 222, 0x02), + (41, 222, 0x02), + (56, 222, 0x03), + (3, 223, 0x02), + (6, 223, 0x02), + (10, 223, 0x02), + (15, 223, 0x02), + (24, 223, 0x02), + (31, 223, 0x02), + (41, 223, 0x02), + (56, 223, 0x03), + ], + // 215 + [ + (3, 241, 0x02), + (6, 241, 0x02), + (10, 241, 0x02), + (15, 241, 0x02), + (24, 241, 0x02), + (31, 241, 0x02), + (41, 241, 0x02), + (56, 241, 0x03), + (3, 244, 0x02), + (6, 244, 0x02), + (10, 244, 0x02), + (15, 244, 0x02), + (24, 244, 0x02), + (31, 244, 0x02), + (41, 244, 0x02), + (56, 244, 0x03), + ], + // 216 + [ + (1, 245, 0x02), + (22, 245, 0x03), + (1, 246, 0x02), + (22, 246, 0x03), + (1, 247, 0x02), + (22, 247, 0x03), + (1, 248, 0x02), + (22, 248, 0x03), + (1, 250, 0x02), + (22, 250, 0x03), + (1, 251, 0x02), + (22, 251, 0x03), + (1, 252, 0x02), + (22, 252, 0x03), + (1, 253, 0x02), + (22, 253, 0x03), + ], + // 217 + [ + (2, 245, 0x02), + (9, 245, 0x02), + (23, 245, 0x02), + (40, 245, 0x03), + (2, 246, 0x02), + (9, 246, 0x02), + (23, 246, 0x02), + (40, 246, 0x03), + (2, 247, 0x02), + (9, 247, 0x02), + (23, 247, 0x02), + (40, 247, 0x03), + (2, 248, 0x02), + (9, 248, 0x02), + (23, 248, 0x02), + (40, 248, 0x03), + ], + // 218 + [ + (3, 245, 0x02), + (6, 245, 0x02), + (10, 245, 0x02), + (15, 245, 0x02), + (24, 245, 0x02), + (31, 245, 0x02), + (41, 245, 0x02), + (56, 245, 0x03), + (3, 246, 0x02), + (6, 246, 0x02), + (10, 246, 0x02), + (15, 246, 0x02), + (24, 246, 0x02), + (31, 246, 0x02), + (41, 246, 0x02), + (56, 246, 0x03), + ], + // 219 + [ + (3, 247, 0x02), + (6, 247, 0x02), + (10, 247, 0x02), + (15, 247, 0x02), + (24, 247, 0x02), + (31, 247, 0x02), + (41, 247, 0x02), + (56, 247, 0x03), + (3, 248, 0x02), + (6, 248, 0x02), + (10, 248, 0x02), + (15, 248, 0x02), + (24, 248, 0x02), + (31, 248, 0x02), + (41, 248, 0x02), + (56, 248, 0x03), + ], + // 220 + [ + (2, 250, 0x02), + (9, 250, 0x02), + (23, 250, 0x02), + (40, 250, 0x03), + (2, 251, 0x02), + (9, 251, 0x02), + (23, 251, 0x02), + (40, 251, 0x03), + (2, 252, 0x02), + (9, 252, 0x02), + (23, 252, 0x02), + (40, 252, 0x03), + (2, 253, 0x02), + (9, 253, 0x02), + (23, 253, 0x02), + (40, 253, 0x03), + ], + // 221 + [ + (3, 250, 0x02), + (6, 250, 0x02), + (10, 250, 0x02), + (15, 250, 0x02), + (24, 250, 0x02), + (31, 250, 0x02), + (41, 250, 0x02), + (56, 250, 0x03), + (3, 251, 0x02), + (6, 251, 0x02), + (10, 251, 0x02), + (15, 251, 0x02), + (24, 251, 0x02), + (31, 251, 0x02), + (41, 251, 0x02), + (56, 251, 0x03), + ], + // 222 + [ + (3, 252, 0x02), + (6, 252, 0x02), + (10, 252, 0x02), + (15, 252, 0x02), + (24, 252, 0x02), + (31, 252, 0x02), + (41, 252, 0x02), + (56, 252, 0x03), + (3, 253, 0x02), + (6, 253, 0x02), + (10, 253, 0x02), + (15, 253, 0x02), + (24, 253, 0x02), + (31, 253, 0x02), + (41, 253, 0x02), + (56, 253, 0x03), + ], + // 223 + [ + (0, 254, 0x02), + (227, 0, 0x00), + (229, 0, 0x00), + (230, 0, 0x00), + (233, 0, 0x00), + (234, 0, 0x00), + (236, 0, 0x00), + (237, 0, 0x00), + (241, 0, 0x00), + (242, 0, 0x00), + (244, 0, 0x00), + (245, 0, 0x00), + (248, 0, 0x00), + (249, 0, 0x00), + (251, 0, 0x00), + (252, 0, 0x00), + ], + // 224 + [ + (1, 254, 0x02), + (22, 254, 0x03), + (0, 2, 0x02), + (0, 3, 0x02), + (0, 4, 0x02), + (0, 5, 0x02), + (0, 6, 0x02), + (0, 7, 0x02), + (0, 8, 0x02), + (0, 11, 0x02), + (0, 12, 0x02), + (0, 14, 0x02), + (0, 15, 0x02), + (0, 16, 0x02), + (0, 17, 0x02), + (0, 18, 0x02), + ], + // 225 + [ + (2, 254, 0x02), + (9, 254, 0x02), + (23, 254, 0x02), + (40, 254, 0x03), + (1, 2, 0x02), + (22, 2, 0x03), + (1, 3, 0x02), + (22, 3, 0x03), + (1, 4, 0x02), + (22, 4, 0x03), + (1, 5, 0x02), + (22, 5, 0x03), + (1, 6, 0x02), + (22, 6, 0x03), + (1, 7, 0x02), + (22, 7, 0x03), + ], + // 226 + [ + (3, 254, 0x02), + (6, 254, 0x02), + (10, 254, 0x02), + (15, 254, 0x02), + (24, 254, 0x02), + (31, 254, 0x02), + (41, 254, 0x02), + (56, 254, 0x03), + (2, 2, 0x02), + (9, 2, 0x02), + (23, 2, 0x02), + (40, 2, 0x03), + (2, 3, 0x02), + (9, 3, 0x02), + (23, 3, 0x02), + (40, 3, 0x03), + ], + // 227 + [ + (3, 2, 0x02), + (6, 2, 0x02), + (10, 2, 0x02), + (15, 2, 0x02), + (24, 2, 0x02), + (31, 2, 0x02), + (41, 2, 0x02), + (56, 2, 0x03), + (3, 3, 0x02), + (6, 3, 0x02), + (10, 3, 0x02), + (15, 3, 0x02), + (24, 3, 0x02), + (31, 3, 0x02), + (41, 3, 0x02), + (56, 3, 0x03), + ], + // 228 + [ + (2, 4, 0x02), + (9, 4, 0x02), + (23, 4, 0x02), + (40, 4, 0x03), + (2, 5, 0x02), + (9, 5, 0x02), + (23, 5, 0x02), + (40, 5, 0x03), + (2, 6, 0x02), + (9, 6, 0x02), + (23, 6, 0x02), + (40, 6, 0x03), + (2, 7, 0x02), + (9, 7, 0x02), + (23, 7, 0x02), + (40, 7, 0x03), + ], + // 229 + [ + (3, 4, 0x02), + (6, 4, 0x02), + (10, 4, 0x02), + (15, 4, 0x02), + (24, 4, 0x02), + (31, 4, 0x02), + (41, 4, 0x02), + (56, 4, 0x03), + (3, 5, 0x02), + (6, 5, 0x02), + (10, 5, 0x02), + (15, 5, 0x02), + (24, 5, 0x02), + (31, 5, 0x02), + (41, 5, 0x02), + (56, 5, 0x03), + ], + // 230 + [ + (3, 6, 0x02), + (6, 6, 0x02), + (10, 6, 0x02), + (15, 6, 0x02), + (24, 6, 0x02), + (31, 6, 0x02), + (41, 6, 0x02), + (56, 6, 0x03), + (3, 7, 0x02), + (6, 7, 0x02), + (10, 7, 0x02), + (15, 7, 0x02), + (24, 7, 0x02), + (31, 7, 0x02), + (41, 7, 0x02), + (56, 7, 0x03), + ], + // 231 + [ + (1, 8, 0x02), + (22, 8, 0x03), + (1, 11, 0x02), + (22, 11, 0x03), + (1, 12, 0x02), + (22, 12, 0x03), + (1, 14, 0x02), + (22, 14, 0x03), + (1, 15, 0x02), + (22, 15, 0x03), + (1, 16, 0x02), + (22, 16, 0x03), + (1, 17, 0x02), + (22, 17, 0x03), + (1, 18, 0x02), + (22, 18, 0x03), + ], + // 232 + [ + (2, 8, 0x02), + (9, 8, 0x02), + (23, 8, 0x02), + (40, 8, 0x03), + (2, 11, 0x02), + (9, 11, 0x02), + (23, 11, 0x02), + (40, 11, 0x03), + (2, 12, 0x02), + (9, 12, 0x02), + (23, 12, 0x02), + (40, 12, 0x03), + (2, 14, 0x02), + (9, 14, 0x02), + (23, 14, 0x02), + (40, 14, 0x03), + ], + // 233 + [ + (3, 8, 0x02), + (6, 8, 0x02), + (10, 8, 0x02), + (15, 8, 0x02), + (24, 8, 0x02), + (31, 8, 0x02), + (41, 8, 0x02), + (56, 8, 0x03), + (3, 11, 0x02), + (6, 11, 0x02), + (10, 11, 0x02), + (15, 11, 0x02), + (24, 11, 0x02), + (31, 11, 0x02), + (41, 11, 0x02), + (56, 11, 0x03), + ], + // 234 + [ + (3, 12, 0x02), + (6, 12, 0x02), + (10, 12, 0x02), + (15, 12, 0x02), + (24, 12, 0x02), + (31, 12, 0x02), + (41, 12, 0x02), + (56, 12, 0x03), + (3, 14, 0x02), + (6, 14, 0x02), + (10, 14, 0x02), + (15, 14, 0x02), + (24, 14, 0x02), + (31, 14, 0x02), + (41, 14, 0x02), + (56, 14, 0x03), + ], + // 235 + [ + (2, 15, 0x02), + (9, 15, 0x02), + (23, 15, 0x02), + (40, 15, 0x03), + (2, 16, 0x02), + (9, 16, 0x02), + (23, 16, 0x02), + (40, 16, 0x03), + (2, 17, 0x02), + (9, 17, 0x02), + (23, 17, 0x02), + (40, 17, 0x03), + (2, 18, 0x02), + (9, 18, 0x02), + (23, 18, 0x02), + (40, 18, 0x03), + ], + // 236 + [ + (3, 15, 0x02), + (6, 15, 0x02), + (10, 15, 0x02), + (15, 15, 0x02), + (24, 15, 0x02), + (31, 15, 0x02), + (41, 15, 0x02), + (56, 15, 0x03), + (3, 16, 0x02), + (6, 16, 0x02), + (10, 16, 0x02), + (15, 16, 0x02), + (24, 16, 0x02), + (31, 16, 0x02), + (41, 16, 0x02), + (56, 16, 0x03), + ], + // 237 + [ + (3, 17, 0x02), + (6, 17, 0x02), + (10, 17, 0x02), + (15, 17, 0x02), + (24, 17, 0x02), + (31, 17, 0x02), + (41, 17, 0x02), + (56, 17, 0x03), + (3, 18, 0x02), + (6, 18, 0x02), + (10, 18, 0x02), + (15, 18, 0x02), + (24, 18, 0x02), + (31, 18, 0x02), + (41, 18, 0x02), + (56, 18, 0x03), + ], + // 238 + [ + (0, 19, 0x02), + (0, 20, 0x02), + (0, 21, 0x02), + (0, 23, 0x02), + (0, 24, 0x02), + (0, 25, 0x02), + (0, 26, 0x02), + (0, 27, 0x02), + (0, 28, 0x02), + (0, 29, 0x02), + (0, 30, 0x02), + (0, 31, 0x02), + (0, 127, 0x02), + (0, 220, 0x02), + (0, 249, 0x02), + (253, 0, 0x00), + ], + // 239 + [ + (1, 19, 0x02), + (22, 19, 0x03), + (1, 20, 0x02), + (22, 20, 0x03), + (1, 21, 0x02), + (22, 21, 0x03), + (1, 23, 0x02), + (22, 23, 0x03), + (1, 24, 0x02), + (22, 24, 0x03), + (1, 25, 0x02), + (22, 25, 0x03), + (1, 26, 0x02), + (22, 26, 0x03), + (1, 27, 0x02), + (22, 27, 0x03), + ], + // 240 + [ + (2, 19, 0x02), + (9, 19, 0x02), + (23, 19, 0x02), + (40, 19, 0x03), + (2, 20, 0x02), + (9, 20, 0x02), + (23, 20, 0x02), + (40, 20, 0x03), + (2, 21, 0x02), + (9, 21, 0x02), + (23, 21, 0x02), + (40, 21, 0x03), + (2, 23, 0x02), + (9, 23, 0x02), + (23, 23, 0x02), + (40, 23, 0x03), + ], + // 241 + [ + (3, 19, 0x02), + (6, 19, 0x02), + (10, 19, 0x02), + (15, 19, 0x02), + (24, 19, 0x02), + (31, 19, 0x02), + (41, 19, 0x02), + (56, 19, 0x03), + (3, 20, 0x02), + (6, 20, 0x02), + (10, 20, 0x02), + (15, 20, 0x02), + (24, 20, 0x02), + (31, 20, 0x02), + (41, 20, 0x02), + (56, 20, 0x03), + ], + // 242 + [ + (3, 21, 0x02), + (6, 21, 0x02), + (10, 21, 0x02), + (15, 21, 0x02), + (24, 21, 0x02), + (31, 21, 0x02), + (41, 21, 0x02), + (56, 21, 0x03), + (3, 23, 0x02), + (6, 23, 0x02), + (10, 23, 0x02), + (15, 23, 0x02), + (24, 23, 0x02), + (31, 23, 0x02), + (41, 23, 0x02), + (56, 23, 0x03), + ], + // 243 + [ + (2, 24, 0x02), + (9, 24, 0x02), + (23, 24, 0x02), + (40, 24, 0x03), + (2, 25, 0x02), + (9, 25, 0x02), + (23, 25, 0x02), + (40, 25, 0x03), + (2, 26, 0x02), + (9, 26, 0x02), + (23, 26, 0x02), + (40, 26, 0x03), + (2, 27, 0x02), + (9, 27, 0x02), + (23, 27, 0x02), + (40, 27, 0x03), + ], + // 244 + [ + (3, 24, 0x02), + (6, 24, 0x02), + (10, 24, 0x02), + (15, 24, 0x02), + (24, 24, 0x02), + (31, 24, 0x02), + (41, 24, 0x02), + (56, 24, 0x03), + (3, 25, 0x02), + (6, 25, 0x02), + (10, 25, 0x02), + (15, 25, 0x02), + (24, 25, 0x02), + (31, 25, 0x02), + (41, 25, 0x02), + (56, 25, 0x03), + ], + // 245 + [ + (3, 26, 0x02), + (6, 26, 0x02), + (10, 26, 0x02), + (15, 26, 0x02), + (24, 26, 0x02), + (31, 26, 0x02), + (41, 26, 0x02), + (56, 26, 0x03), + (3, 27, 0x02), + (6, 27, 0x02), + (10, 27, 0x02), + (15, 27, 0x02), + (24, 27, 0x02), + (31, 27, 0x02), + (41, 27, 0x02), + (56, 27, 0x03), + ], + // 246 + [ + (1, 28, 0x02), + (22, 28, 0x03), + (1, 29, 0x02), + (22, 29, 0x03), + (1, 30, 0x02), + (22, 30, 0x03), + (1, 31, 0x02), + (22, 31, 0x03), + (1, 127, 0x02), + (22, 127, 0x03), + (1, 220, 0x02), + (22, 220, 0x03), + (1, 249, 0x02), + (22, 249, 0x03), + (254, 0, 0x00), + (255, 0, 0x00), + ], + // 247 + [ + (2, 28, 0x02), + (9, 28, 0x02), + (23, 28, 0x02), + (40, 28, 0x03), + (2, 29, 0x02), + (9, 29, 0x02), + (23, 29, 0x02), + (40, 29, 0x03), + (2, 30, 0x02), + (9, 30, 0x02), + (23, 30, 0x02), + (40, 30, 0x03), + (2, 31, 0x02), + (9, 31, 0x02), + (23, 31, 0x02), + (40, 31, 0x03), + ], + // 248 + [ + (3, 28, 0x02), + (6, 28, 0x02), + (10, 28, 0x02), + (15, 28, 0x02), + (24, 28, 0x02), + (31, 28, 0x02), + (41, 28, 0x02), + (56, 28, 0x03), + (3, 29, 0x02), + (6, 29, 0x02), + (10, 29, 0x02), + (15, 29, 0x02), + (24, 29, 0x02), + (31, 29, 0x02), + (41, 29, 0x02), + (56, 29, 0x03), + ], + // 249 + [ + (3, 30, 0x02), + (6, 30, 0x02), + (10, 30, 0x02), + (15, 30, 0x02), + (24, 30, 0x02), + (31, 30, 0x02), + (41, 30, 0x02), + (56, 30, 0x03), + (3, 31, 0x02), + (6, 31, 0x02), + (10, 31, 0x02), + (15, 31, 0x02), + (24, 31, 0x02), + (31, 31, 0x02), + (41, 31, 0x02), + (56, 31, 0x03), + ], + // 250 + [ + (2, 127, 0x02), + (9, 127, 0x02), + (23, 127, 0x02), + (40, 127, 0x03), + (2, 220, 0x02), + (9, 220, 0x02), + (23, 220, 0x02), + (40, 220, 0x03), + (2, 249, 0x02), + (9, 249, 0x02), + (23, 249, 0x02), + (40, 249, 0x03), + (0, 10, 0x02), + (0, 13, 0x02), + (0, 22, 0x02), + (0, 0, 0x04), + ], + // 251 + [ + (3, 127, 0x02), + (6, 127, 0x02), + (10, 127, 0x02), + (15, 127, 0x02), + (24, 127, 0x02), + (31, 127, 0x02), + (41, 127, 0x02), + (56, 127, 0x03), + (3, 220, 0x02), + (6, 220, 0x02), + (10, 220, 0x02), + (15, 220, 0x02), + (24, 220, 0x02), + (31, 220, 0x02), + (41, 220, 0x02), + (56, 220, 0x03), + ], + // 252 + [ + (3, 249, 0x02), + (6, 249, 0x02), + (10, 249, 0x02), + (15, 249, 0x02), + (24, 249, 0x02), + (31, 249, 0x02), + (41, 249, 0x02), + (56, 249, 0x03), + (1, 10, 0x02), + (22, 10, 0x03), + (1, 13, 0x02), + (22, 13, 0x03), + (1, 22, 0x02), + (22, 22, 0x03), + (0, 0, 0x04), + (0, 0, 0x05), + ], + // 253 + [ + (2, 10, 0x02), + (9, 10, 0x02), + (23, 10, 0x02), + (40, 10, 0x03), + (2, 13, 0x02), + (9, 13, 0x02), + (23, 13, 0x02), + (40, 13, 0x03), + (2, 22, 0x02), + (9, 22, 0x02), + (23, 22, 0x02), + (40, 22, 0x03), + (0, 0, 0x04), + (0, 0, 0x04), + (0, 0, 0x04), + (0, 0, 0x05), + ], + // 254 + [ + (3, 10, 0x02), + (6, 10, 0x02), + (10, 10, 0x02), + (15, 10, 0x02), + (24, 10, 0x02), + (31, 10, 0x02), + (41, 10, 0x02), + (56, 10, 0x03), + (3, 13, 0x02), + (6, 13, 0x02), + (10, 13, 0x02), + (15, 13, 0x02), + (24, 13, 0x02), + (31, 13, 0x02), + (41, 13, 0x02), + (56, 13, 0x03), + ], + // 255 + [ + (3, 22, 0x02), + (6, 22, 0x02), + (10, 22, 0x02), + (15, 22, 0x02), + (24, 22, 0x02), + (31, 22, 0x02), + (41, 22, 0x02), + (56, 22, 0x03), + (0, 0, 0x04), + (0, 0, 0x04), + (0, 0, 0x04), + (0, 0, 0x04), + (0, 0, 0x04), + (0, 0, 0x04), + (0, 0, 0x04), + (0, 0, 0x05), + ], +]; diff --git a/third_party/rust/h2/src/hpack/mod.rs b/third_party/rust/h2/src/hpack/mod.rs new file mode 100644 index 0000000000..12c75d5535 --- /dev/null +++ b/third_party/rust/h2/src/hpack/mod.rs @@ -0,0 +1,12 @@ +mod decoder; +mod encoder; +pub(crate) mod header; +pub(crate) mod huffman; +mod table; + +#[cfg(test)] +mod test; + +pub use self::decoder::{Decoder, DecoderError, NeedMore}; +pub use self::encoder::Encoder; +pub use self::header::{BytesStr, Header}; diff --git a/third_party/rust/h2/src/hpack/table.rs b/third_party/rust/h2/src/hpack/table.rs new file mode 100644 index 0000000000..0124f216d5 --- /dev/null +++ b/third_party/rust/h2/src/hpack/table.rs @@ -0,0 +1,766 @@ +use super::Header; + +use fnv::FnvHasher; +use http::header; +use http::method::Method; + +use std::collections::VecDeque; +use std::hash::{Hash, Hasher}; +use std::{cmp, mem, usize}; + +/// HPACK encoder table +#[derive(Debug)] +pub struct Table { + mask: usize, + indices: Vec<Option<Pos>>, + slots: VecDeque<Slot>, + inserted: usize, + // Size is in bytes + size: usize, + max_size: usize, +} + +#[derive(Debug)] +pub enum Index { + // The header is already fully indexed + Indexed(usize, Header), + + // The name is indexed, but not the value + Name(usize, Header), + + // The full header has been inserted into the table. + Inserted(usize), + + // Only the value has been inserted (hpack table idx, slots idx) + InsertedValue(usize, usize), + + // The header is not indexed by this table + NotIndexed(Header), +} + +#[derive(Debug)] +struct Slot { + hash: HashValue, + header: Header, + next: Option<usize>, +} + +#[derive(Debug, Clone, Copy, Eq, PartialEq)] +struct Pos { + index: usize, + hash: HashValue, +} + +#[derive(Debug, Copy, Clone, Eq, PartialEq)] +struct HashValue(usize); + +const MAX_SIZE: usize = 1 << 16; +const DYN_OFFSET: usize = 62; + +macro_rules! probe_loop { + ($probe_var: ident < $len: expr, $body: expr) => { + debug_assert!($len > 0); + loop { + if $probe_var < $len { + $body + $probe_var += 1; + } else { + $probe_var = 0; + } + } + }; +} + +impl Table { + pub fn new(max_size: usize, capacity: usize) -> Table { + if capacity == 0 { + Table { + mask: 0, + indices: vec![], + slots: VecDeque::new(), + inserted: 0, + size: 0, + max_size, + } + } else { + let capacity = cmp::max(to_raw_capacity(capacity).next_power_of_two(), 8); + + Table { + mask: capacity.wrapping_sub(1), + indices: vec![None; capacity], + slots: VecDeque::with_capacity(usable_capacity(capacity)), + inserted: 0, + size: 0, + max_size, + } + } + } + + #[inline] + pub fn capacity(&self) -> usize { + usable_capacity(self.indices.len()) + } + + pub fn max_size(&self) -> usize { + self.max_size + } + + /// Gets the header stored in the table + pub fn resolve<'a>(&'a self, index: &'a Index) -> &'a Header { + use self::Index::*; + + match *index { + Indexed(_, ref h) => h, + Name(_, ref h) => h, + Inserted(idx) => &self.slots[idx].header, + InsertedValue(_, idx) => &self.slots[idx].header, + NotIndexed(ref h) => h, + } + } + + pub fn resolve_idx(&self, index: &Index) -> usize { + use self::Index::*; + + match *index { + Indexed(idx, ..) => idx, + Name(idx, ..) => idx, + Inserted(idx) => idx + DYN_OFFSET, + InsertedValue(_name_idx, slot_idx) => slot_idx + DYN_OFFSET, + NotIndexed(_) => panic!("cannot resolve index"), + } + } + + /// Index the header in the HPACK table. + pub fn index(&mut self, header: Header) -> Index { + // Check the static table + let statik = index_static(&header); + + // Don't index certain headers. This logic is borrowed from nghttp2. + if header.skip_value_index() { + // Right now, if this is true, the header name is always in the + // static table. At some point in the future, this might not be true + // and this logic will need to be updated. + debug_assert!(statik.is_some(), "skip_value_index requires a static name",); + return Index::new(statik, header); + } + + // If the header is already indexed by the static table, return that + if let Some((n, true)) = statik { + return Index::Indexed(n, header); + } + + // Don't index large headers + if header.len() * 4 > self.max_size * 3 { + return Index::new(statik, header); + } + + self.index_dynamic(header, statik) + } + + fn index_dynamic(&mut self, header: Header, statik: Option<(usize, bool)>) -> Index { + debug_assert!(self.assert_valid_state("one")); + + if header.len() + self.size < self.max_size || !header.is_sensitive() { + // Only grow internal storage if needed + self.reserve_one(); + } + + if self.indices.is_empty() { + // If `indices` is not empty, then it is impossible for all + // `indices` entries to be `Some`. So, we only need to check for the + // empty case. + return Index::new(statik, header); + } + + let hash = hash_header(&header); + + let desired_pos = desired_pos(self.mask, hash); + let mut probe = desired_pos; + let mut dist = 0; + + // Start at the ideal position, checking all slots + probe_loop!(probe < self.indices.len(), { + if let Some(pos) = self.indices[probe] { + // The slot is already occupied, but check if it has a lower + // displacement. + let their_dist = probe_distance(self.mask, pos.hash, probe); + + let slot_idx = pos.index.wrapping_add(self.inserted); + + if their_dist < dist { + // Index robinhood + return self.index_vacant(header, hash, dist, probe, statik); + } else if pos.hash == hash && self.slots[slot_idx].header.name() == header.name() { + // Matching name, check values + return self.index_occupied(header, hash, pos.index, statik.map(|(n, _)| n)); + } + } else { + return self.index_vacant(header, hash, dist, probe, statik); + } + + dist += 1; + }); + } + + fn index_occupied( + &mut self, + header: Header, + hash: HashValue, + mut index: usize, + statik: Option<usize>, + ) -> Index { + debug_assert!(self.assert_valid_state("top")); + + // There already is a match for the given header name. Check if a value + // matches. The header will also only be inserted if the table is not at + // capacity. + loop { + // Compute the real index into the VecDeque + let real_idx = index.wrapping_add(self.inserted); + + if self.slots[real_idx].header.value_eq(&header) { + // We have a full match! + return Index::Indexed(real_idx + DYN_OFFSET, header); + } + + if let Some(next) = self.slots[real_idx].next { + index = next; + continue; + } + + if header.is_sensitive() { + // Should we assert this? + // debug_assert!(statik.is_none()); + return Index::Name(real_idx + DYN_OFFSET, header); + } + + self.update_size(header.len(), Some(index)); + + // Insert the new header + self.insert(header, hash); + + // Recompute real_idx as it just changed. + let new_real_idx = index.wrapping_add(self.inserted); + + // The previous node in the linked list may have gotten evicted + // while making room for this header. + if new_real_idx < self.slots.len() { + let idx = 0usize.wrapping_sub(self.inserted); + + self.slots[new_real_idx].next = Some(idx); + } + + debug_assert!(self.assert_valid_state("bottom")); + + // Even if the previous header was evicted, we can still reference + // it when inserting the new one... + return if let Some(n) = statik { + // If name is in static table, use it instead + Index::InsertedValue(n, 0) + } else { + Index::InsertedValue(real_idx + DYN_OFFSET, 0) + }; + } + } + + fn index_vacant( + &mut self, + header: Header, + hash: HashValue, + mut dist: usize, + mut probe: usize, + statik: Option<(usize, bool)>, + ) -> Index { + if header.is_sensitive() { + return Index::new(statik, header); + } + + debug_assert!(self.assert_valid_state("top")); + debug_assert!(dist == 0 || self.indices[probe.wrapping_sub(1) & self.mask].is_some()); + + // Passing in `usize::MAX` for prev_idx since there is no previous + // header in this case. + if self.update_size(header.len(), None) { + while dist != 0 { + let back = probe.wrapping_sub(1) & self.mask; + + if let Some(pos) = self.indices[back] { + let their_dist = probe_distance(self.mask, pos.hash, back); + + if their_dist < (dist - 1) { + probe = back; + dist -= 1; + } else { + break; + } + } else { + probe = back; + dist -= 1; + } + } + } + + debug_assert!(self.assert_valid_state("after update")); + + self.insert(header, hash); + + let pos_idx = 0usize.wrapping_sub(self.inserted); + + let prev = mem::replace( + &mut self.indices[probe], + Some(Pos { + index: pos_idx, + hash, + }), + ); + + if let Some(mut prev) = prev { + // Shift forward + let mut probe = probe + 1; + + probe_loop!(probe < self.indices.len(), { + let pos = &mut self.indices[probe as usize]; + + prev = match mem::replace(pos, Some(prev)) { + Some(p) => p, + None => break, + }; + }); + } + + debug_assert!(self.assert_valid_state("bottom")); + + if let Some((n, _)) = statik { + Index::InsertedValue(n, 0) + } else { + Index::Inserted(0) + } + } + + fn insert(&mut self, header: Header, hash: HashValue) { + self.inserted = self.inserted.wrapping_add(1); + + self.slots.push_front(Slot { + hash, + header, + next: None, + }); + } + + pub fn resize(&mut self, size: usize) { + self.max_size = size; + + if size == 0 { + self.size = 0; + + for i in &mut self.indices { + *i = None; + } + + self.slots.clear(); + self.inserted = 0; + } else { + self.converge(None); + } + } + + fn update_size(&mut self, len: usize, prev_idx: Option<usize>) -> bool { + self.size += len; + self.converge(prev_idx) + } + + fn converge(&mut self, prev_idx: Option<usize>) -> bool { + let mut ret = false; + + while self.size > self.max_size { + ret = true; + self.evict(prev_idx); + } + + ret + } + + fn evict(&mut self, prev_idx: Option<usize>) { + let pos_idx = (self.slots.len() - 1).wrapping_sub(self.inserted); + + debug_assert!(!self.slots.is_empty()); + debug_assert!(self.assert_valid_state("one")); + + // Remove the header + let slot = self.slots.pop_back().unwrap(); + let mut probe = desired_pos(self.mask, slot.hash); + + // Update the size + self.size -= slot.header.len(); + + debug_assert_eq!( + self.indices + .iter() + .filter_map(|p| *p) + .filter(|p| p.index == pos_idx) + .count(), + 1 + ); + + // Find the associated position + probe_loop!(probe < self.indices.len(), { + debug_assert!(!self.indices[probe].is_none()); + + let mut pos = self.indices[probe].unwrap(); + + if pos.index == pos_idx { + if let Some(idx) = slot.next { + pos.index = idx; + self.indices[probe] = Some(pos); + } else if Some(pos.index) == prev_idx { + pos.index = 0usize.wrapping_sub(self.inserted + 1); + self.indices[probe] = Some(pos); + } else { + self.indices[probe] = None; + self.remove_phase_two(probe); + } + + break; + } + }); + + debug_assert!(self.assert_valid_state("two")); + } + + // Shifts all indices that were displaced by the header that has just been + // removed. + fn remove_phase_two(&mut self, probe: usize) { + let mut last_probe = probe; + let mut probe = probe + 1; + + probe_loop!(probe < self.indices.len(), { + if let Some(pos) = self.indices[probe] { + if probe_distance(self.mask, pos.hash, probe) > 0 { + self.indices[last_probe] = self.indices[probe].take(); + } else { + break; + } + } else { + break; + } + + last_probe = probe; + }); + + debug_assert!(self.assert_valid_state("two")); + } + + fn reserve_one(&mut self) { + let len = self.slots.len(); + + if len == self.capacity() { + if len == 0 { + let new_raw_cap = 8; + self.mask = 8 - 1; + self.indices = vec![None; new_raw_cap]; + } else { + let raw_cap = self.indices.len(); + self.grow(raw_cap << 1); + } + } + } + + #[inline] + fn grow(&mut self, new_raw_cap: usize) { + // This path can never be reached when handling the first allocation in + // the map. + + debug_assert!(self.assert_valid_state("top")); + + // find first ideally placed element -- start of cluster + let mut first_ideal = 0; + + for (i, pos) in self.indices.iter().enumerate() { + if let Some(pos) = *pos { + if 0 == probe_distance(self.mask, pos.hash, i) { + first_ideal = i; + break; + } + } + } + + // visit the entries in an order where we can simply reinsert them + // into self.indices without any bucket stealing. + let old_indices = mem::replace(&mut self.indices, vec![None; new_raw_cap]); + self.mask = new_raw_cap.wrapping_sub(1); + + for &pos in &old_indices[first_ideal..] { + self.reinsert_entry_in_order(pos); + } + + for &pos in &old_indices[..first_ideal] { + self.reinsert_entry_in_order(pos); + } + + debug_assert!(self.assert_valid_state("bottom")); + } + + fn reinsert_entry_in_order(&mut self, pos: Option<Pos>) { + if let Some(pos) = pos { + // Find first empty bucket and insert there + let mut probe = desired_pos(self.mask, pos.hash); + + probe_loop!(probe < self.indices.len(), { + if self.indices[probe].is_none() { + // empty bucket, insert here + self.indices[probe] = Some(pos); + return; + } + + debug_assert!({ + let them = self.indices[probe].unwrap(); + let their_distance = probe_distance(self.mask, them.hash, probe); + let our_distance = probe_distance(self.mask, pos.hash, probe); + + their_distance >= our_distance + }); + }); + } + } + + #[cfg(not(test))] + fn assert_valid_state(&self, _: &'static str) -> bool { + true + } + + #[cfg(test)] + fn assert_valid_state(&self, _msg: &'static str) -> bool { + /* + // Checks that the internal map structure is valid + // + // Ensure all hash codes in indices match the associated slot + for pos in &self.indices { + if let Some(pos) = *pos { + let real_idx = pos.index.wrapping_add(self.inserted); + + if real_idx.wrapping_add(1) != 0 { + assert!(real_idx < self.slots.len(), + "out of index; real={}; len={}, msg={}", + real_idx, self.slots.len(), msg); + + assert_eq!(pos.hash, self.slots[real_idx].hash, + "index hash does not match slot; msg={}", msg); + } + } + } + + // Every index is only available once + for i in 0..self.indices.len() { + if self.indices[i].is_none() { + continue; + } + + for j in i+1..self.indices.len() { + assert_ne!(self.indices[i], self.indices[j], + "duplicate indices; msg={}", msg); + } + } + + for (index, slot) in self.slots.iter().enumerate() { + let mut indexed = None; + + // First, see if the slot is indexed + for (i, pos) in self.indices.iter().enumerate() { + if let Some(pos) = *pos { + let real_idx = pos.index.wrapping_add(self.inserted); + if real_idx == index { + indexed = Some(i); + // Already know that there is no dup, so break + break; + } + } + } + + if let Some(actual) = indexed { + // Ensure that it is accessible.. + let desired = desired_pos(self.mask, slot.hash); + let mut probe = desired; + let mut dist = 0; + + probe_loop!(probe < self.indices.len(), { + assert!(self.indices[probe].is_some(), + "unexpected empty slot; probe={}; hash={:?}; msg={}", + probe, slot.hash, msg); + + let pos = self.indices[probe].unwrap(); + + let their_dist = probe_distance(self.mask, pos.hash, probe); + let real_idx = pos.index.wrapping_add(self.inserted); + + if real_idx == index { + break; + } + + assert!(dist <= their_dist, + "could not find entry; actual={}; desired={}" + + "probe={}, dist={}; their_dist={}; index={}; msg={}", + actual, desired, probe, dist, their_dist, + index.wrapping_sub(self.inserted), msg); + + dist += 1; + }); + } else { + // There is exactly one next link + let cnt = self.slots.iter().map(|s| s.next) + .filter(|n| *n == Some(index.wrapping_sub(self.inserted))) + .count(); + + assert_eq!(1, cnt, "more than one node pointing here; msg={}", msg); + } + } + */ + + // TODO: Ensure linked lists are correct: no cycles, etc... + + true + } +} + +#[cfg(test)] +impl Table { + /// Returns the number of headers in the table + pub fn len(&self) -> usize { + self.slots.len() + } + + /// Returns the table size + pub fn size(&self) -> usize { + self.size + } +} + +impl Index { + fn new(v: Option<(usize, bool)>, e: Header) -> Index { + match v { + None => Index::NotIndexed(e), + Some((n, true)) => Index::Indexed(n, e), + Some((n, false)) => Index::Name(n, e), + } + } +} + +#[inline] +fn usable_capacity(cap: usize) -> usize { + cap - cap / 4 +} + +#[inline] +fn to_raw_capacity(n: usize) -> usize { + n + n / 3 +} + +#[inline] +fn desired_pos(mask: usize, hash: HashValue) -> usize { + (hash.0 & mask) as usize +} + +#[inline] +fn probe_distance(mask: usize, hash: HashValue, current: usize) -> usize { + current.wrapping_sub(desired_pos(mask, hash)) & mask as usize +} + +fn hash_header(header: &Header) -> HashValue { + const MASK: u64 = (MAX_SIZE as u64) - 1; + + let mut h = FnvHasher::default(); + header.name().hash(&mut h); + HashValue((h.finish() & MASK) as usize) +} + +/// Checks the static table for the header. If found, returns the index and a +/// boolean representing if the value matched as well. +fn index_static(header: &Header) -> Option<(usize, bool)> { + match *header { + Header::Field { + ref name, + ref value, + } => match *name { + header::ACCEPT_CHARSET => Some((15, false)), + header::ACCEPT_ENCODING => { + if value == "gzip, deflate" { + Some((16, true)) + } else { + Some((16, false)) + } + } + header::ACCEPT_LANGUAGE => Some((17, false)), + header::ACCEPT_RANGES => Some((18, false)), + header::ACCEPT => Some((19, false)), + header::ACCESS_CONTROL_ALLOW_ORIGIN => Some((20, false)), + header::AGE => Some((21, false)), + header::ALLOW => Some((22, false)), + header::AUTHORIZATION => Some((23, false)), + header::CACHE_CONTROL => Some((24, false)), + header::CONTENT_DISPOSITION => Some((25, false)), + header::CONTENT_ENCODING => Some((26, false)), + header::CONTENT_LANGUAGE => Some((27, false)), + header::CONTENT_LENGTH => Some((28, false)), + header::CONTENT_LOCATION => Some((29, false)), + header::CONTENT_RANGE => Some((30, false)), + header::CONTENT_TYPE => Some((31, false)), + header::COOKIE => Some((32, false)), + header::DATE => Some((33, false)), + header::ETAG => Some((34, false)), + header::EXPECT => Some((35, false)), + header::EXPIRES => Some((36, false)), + header::FROM => Some((37, false)), + header::HOST => Some((38, false)), + header::IF_MATCH => Some((39, false)), + header::IF_MODIFIED_SINCE => Some((40, false)), + header::IF_NONE_MATCH => Some((41, false)), + header::IF_RANGE => Some((42, false)), + header::IF_UNMODIFIED_SINCE => Some((43, false)), + header::LAST_MODIFIED => Some((44, false)), + header::LINK => Some((45, false)), + header::LOCATION => Some((46, false)), + header::MAX_FORWARDS => Some((47, false)), + header::PROXY_AUTHENTICATE => Some((48, false)), + header::PROXY_AUTHORIZATION => Some((49, false)), + header::RANGE => Some((50, false)), + header::REFERER => Some((51, false)), + header::REFRESH => Some((52, false)), + header::RETRY_AFTER => Some((53, false)), + header::SERVER => Some((54, false)), + header::SET_COOKIE => Some((55, false)), + header::STRICT_TRANSPORT_SECURITY => Some((56, false)), + header::TRANSFER_ENCODING => Some((57, false)), + header::USER_AGENT => Some((58, false)), + header::VARY => Some((59, false)), + header::VIA => Some((60, false)), + header::WWW_AUTHENTICATE => Some((61, false)), + _ => None, + }, + Header::Authority(_) => Some((1, false)), + Header::Method(ref v) => match *v { + Method::GET => Some((2, true)), + Method::POST => Some((3, true)), + _ => Some((2, false)), + }, + Header::Scheme(ref v) => match &**v { + "http" => Some((6, true)), + "https" => Some((7, true)), + _ => Some((6, false)), + }, + Header::Path(ref v) => match &**v { + "/" => Some((4, true)), + "/index.html" => Some((5, true)), + _ => Some((4, false)), + }, + Header::Protocol(..) => None, + Header::Status(ref v) => match u16::from(*v) { + 200 => Some((8, true)), + 204 => Some((9, true)), + 206 => Some((10, true)), + 304 => Some((11, true)), + 400 => Some((12, true)), + 404 => Some((13, true)), + 500 => Some((14, true)), + _ => Some((8, false)), + }, + } +} diff --git a/third_party/rust/h2/src/hpack/test/fixture.rs b/third_party/rust/h2/src/hpack/test/fixture.rs new file mode 100644 index 0000000000..3428c39583 --- /dev/null +++ b/third_party/rust/h2/src/hpack/test/fixture.rs @@ -0,0 +1,615 @@ +use crate::hpack::{Decoder, Encoder, Header}; + +use bytes::BytesMut; +use hex::FromHex; +use serde_json::Value; + +use std::fs::File; +use std::io::prelude::*; +use std::io::Cursor; +use std::path::Path; +use std::str; + +fn test_fixture(path: &Path) { + let mut file = File::open(path).unwrap(); + let mut data = String::new(); + file.read_to_string(&mut data).unwrap(); + + let story: Value = serde_json::from_str(&data).unwrap(); + test_story(story); +} + +fn test_story(story: Value) { + let story = story.as_object().unwrap(); + + if let Some(cases) = story.get("cases") { + let mut cases: Vec<_> = cases + .as_array() + .unwrap() + .iter() + .map(|case| { + let case = case.as_object().unwrap(); + + let size = case + .get("header_table_size") + .map(|v| v.as_u64().unwrap() as usize); + + let wire = case.get("wire").unwrap().as_str().unwrap(); + let wire: Vec<u8> = FromHex::from_hex(wire.as_bytes()).unwrap(); + + let expect: Vec<_> = case + .get("headers") + .unwrap() + .as_array() + .unwrap() + .iter() + .map(|h| { + let h = h.as_object().unwrap(); + let (name, val) = h.iter().next().unwrap(); + (name.clone(), val.as_str().unwrap().to_string()) + }) + .collect(); + + Case { + seqno: case.get("seqno").unwrap().as_u64().unwrap(), + wire: wire, + expect: expect, + header_table_size: size, + } + }) + .collect(); + + cases.sort_by_key(|c| c.seqno); + + let mut decoder = Decoder::default(); + + // First, check decoding against the fixtures + for case in &cases { + let mut expect = case.expect.clone(); + + if let Some(size) = case.header_table_size { + decoder.queue_size_update(size); + } + + let mut buf = BytesMut::with_capacity(case.wire.len()); + buf.extend_from_slice(&case.wire); + decoder + .decode(&mut Cursor::new(&mut buf), |e| { + let (name, value) = expect.remove(0); + assert_eq!(name, key_str(&e)); + assert_eq!(value, value_str(&e)); + }) + .unwrap(); + + assert_eq!(0, expect.len()); + } + + let mut encoder = Encoder::default(); + let mut decoder = Decoder::default(); + + // Now, encode the headers + for case in &cases { + let limit = 64 * 1024; + let mut buf = BytesMut::with_capacity(limit); + + if let Some(size) = case.header_table_size { + encoder.update_max_size(size); + decoder.queue_size_update(size); + } + + let mut input: Vec<_> = case + .expect + .iter() + .map(|&(ref name, ref value)| { + Header::new(name.clone().into(), value.clone().into()) + .unwrap() + .into() + }) + .collect(); + + encoder.encode(&mut input.clone().into_iter(), &mut buf); + + decoder + .decode(&mut Cursor::new(&mut buf), |e| { + assert_eq!(e, input.remove(0).reify().unwrap()); + }) + .unwrap(); + + assert_eq!(0, input.len()); + } + } +} + +struct Case { + seqno: u64, + wire: Vec<u8>, + expect: Vec<(String, String)>, + header_table_size: Option<usize>, +} + +fn key_str(e: &Header) -> &str { + match *e { + Header::Field { ref name, .. } => name.as_str(), + Header::Authority(..) => ":authority", + Header::Method(..) => ":method", + Header::Scheme(..) => ":scheme", + Header::Path(..) => ":path", + Header::Protocol(..) => ":protocol", + Header::Status(..) => ":status", + } +} + +fn value_str(e: &Header) -> &str { + match *e { + Header::Field { ref value, .. } => value.to_str().unwrap(), + Header::Authority(ref v) => &**v, + Header::Method(ref m) => m.as_str(), + Header::Scheme(ref v) => &**v, + Header::Path(ref v) => &**v, + Header::Protocol(ref v) => v.as_str(), + Header::Status(ref v) => v.as_str(), + } +} + +macro_rules! fixture_mod { + ($module:ident => { + $( + ($fn:ident, $path:expr); + )+ + }) => { + mod $module { + $( + #[test] + fn $fn() { + let path = ::std::path::Path::new(env!("CARGO_MANIFEST_DIR")) + .join("fixtures/hpack") + .join($path); + + super::test_fixture(path.as_ref()); + } + )+ + } + } +} + +fixture_mod!( + haskell_http2_linear_huffman => { + (story_00, "haskell-http2-linear-huffman/story_00.json"); + (story_01, "haskell-http2-linear-huffman/story_01.json"); + (story_02, "haskell-http2-linear-huffman/story_02.json"); + (story_03, "haskell-http2-linear-huffman/story_03.json"); + (story_04, "haskell-http2-linear-huffman/story_04.json"); + (story_05, "haskell-http2-linear-huffman/story_05.json"); + (story_06, "haskell-http2-linear-huffman/story_06.json"); + (story_07, "haskell-http2-linear-huffman/story_07.json"); + (story_08, "haskell-http2-linear-huffman/story_08.json"); + (story_09, "haskell-http2-linear-huffman/story_09.json"); + (story_10, "haskell-http2-linear-huffman/story_10.json"); + (story_11, "haskell-http2-linear-huffman/story_11.json"); + (story_12, "haskell-http2-linear-huffman/story_12.json"); + (story_13, "haskell-http2-linear-huffman/story_13.json"); + (story_14, "haskell-http2-linear-huffman/story_14.json"); + (story_15, "haskell-http2-linear-huffman/story_15.json"); + (story_16, "haskell-http2-linear-huffman/story_16.json"); + (story_17, "haskell-http2-linear-huffman/story_17.json"); + (story_18, "haskell-http2-linear-huffman/story_18.json"); + (story_19, "haskell-http2-linear-huffman/story_19.json"); + (story_20, "haskell-http2-linear-huffman/story_20.json"); + (story_21, "haskell-http2-linear-huffman/story_21.json"); + (story_22, "haskell-http2-linear-huffman/story_22.json"); + (story_23, "haskell-http2-linear-huffman/story_23.json"); + (story_24, "haskell-http2-linear-huffman/story_24.json"); + (story_25, "haskell-http2-linear-huffman/story_25.json"); + (story_26, "haskell-http2-linear-huffman/story_26.json"); + (story_27, "haskell-http2-linear-huffman/story_27.json"); + (story_28, "haskell-http2-linear-huffman/story_28.json"); + (story_29, "haskell-http2-linear-huffman/story_29.json"); + (story_30, "haskell-http2-linear-huffman/story_30.json"); + (story_31, "haskell-http2-linear-huffman/story_31.json"); + } +); + +fixture_mod!( + python_hpack => { + (story_00, "python-hpack/story_00.json"); + (story_01, "python-hpack/story_01.json"); + (story_02, "python-hpack/story_02.json"); + (story_03, "python-hpack/story_03.json"); + (story_04, "python-hpack/story_04.json"); + (story_05, "python-hpack/story_05.json"); + (story_06, "python-hpack/story_06.json"); + (story_07, "python-hpack/story_07.json"); + (story_08, "python-hpack/story_08.json"); + (story_09, "python-hpack/story_09.json"); + (story_10, "python-hpack/story_10.json"); + (story_11, "python-hpack/story_11.json"); + (story_12, "python-hpack/story_12.json"); + (story_13, "python-hpack/story_13.json"); + (story_14, "python-hpack/story_14.json"); + (story_15, "python-hpack/story_15.json"); + (story_16, "python-hpack/story_16.json"); + (story_17, "python-hpack/story_17.json"); + (story_18, "python-hpack/story_18.json"); + (story_19, "python-hpack/story_19.json"); + (story_20, "python-hpack/story_20.json"); + (story_21, "python-hpack/story_21.json"); + (story_22, "python-hpack/story_22.json"); + (story_23, "python-hpack/story_23.json"); + (story_24, "python-hpack/story_24.json"); + (story_25, "python-hpack/story_25.json"); + (story_26, "python-hpack/story_26.json"); + (story_27, "python-hpack/story_27.json"); + (story_28, "python-hpack/story_28.json"); + (story_29, "python-hpack/story_29.json"); + (story_30, "python-hpack/story_30.json"); + (story_31, "python-hpack/story_31.json"); + } +); + +fixture_mod!( + nghttp2_16384_4096 => { + (story_00, "nghttp2-16384-4096/story_00.json"); + (story_01, "nghttp2-16384-4096/story_01.json"); + (story_02, "nghttp2-16384-4096/story_02.json"); + (story_03, "nghttp2-16384-4096/story_03.json"); + (story_04, "nghttp2-16384-4096/story_04.json"); + (story_05, "nghttp2-16384-4096/story_05.json"); + (story_06, "nghttp2-16384-4096/story_06.json"); + (story_07, "nghttp2-16384-4096/story_07.json"); + (story_08, "nghttp2-16384-4096/story_08.json"); + (story_09, "nghttp2-16384-4096/story_09.json"); + (story_10, "nghttp2-16384-4096/story_10.json"); + (story_11, "nghttp2-16384-4096/story_11.json"); + (story_12, "nghttp2-16384-4096/story_12.json"); + (story_13, "nghttp2-16384-4096/story_13.json"); + (story_14, "nghttp2-16384-4096/story_14.json"); + (story_15, "nghttp2-16384-4096/story_15.json"); + (story_16, "nghttp2-16384-4096/story_16.json"); + (story_17, "nghttp2-16384-4096/story_17.json"); + (story_18, "nghttp2-16384-4096/story_18.json"); + (story_19, "nghttp2-16384-4096/story_19.json"); + (story_20, "nghttp2-16384-4096/story_20.json"); + (story_21, "nghttp2-16384-4096/story_21.json"); + (story_22, "nghttp2-16384-4096/story_22.json"); + (story_23, "nghttp2-16384-4096/story_23.json"); + (story_24, "nghttp2-16384-4096/story_24.json"); + (story_25, "nghttp2-16384-4096/story_25.json"); + (story_26, "nghttp2-16384-4096/story_26.json"); + (story_27, "nghttp2-16384-4096/story_27.json"); + (story_28, "nghttp2-16384-4096/story_28.json"); + (story_29, "nghttp2-16384-4096/story_29.json"); + (story_30, "nghttp2-16384-4096/story_30.json"); + } +); + +fixture_mod!( + node_http2_hpack => { + (story_00, "node-http2-hpack/story_00.json"); + (story_01, "node-http2-hpack/story_01.json"); + (story_02, "node-http2-hpack/story_02.json"); + (story_03, "node-http2-hpack/story_03.json"); + (story_04, "node-http2-hpack/story_04.json"); + (story_05, "node-http2-hpack/story_05.json"); + (story_06, "node-http2-hpack/story_06.json"); + (story_07, "node-http2-hpack/story_07.json"); + (story_08, "node-http2-hpack/story_08.json"); + (story_09, "node-http2-hpack/story_09.json"); + (story_10, "node-http2-hpack/story_10.json"); + (story_11, "node-http2-hpack/story_11.json"); + (story_12, "node-http2-hpack/story_12.json"); + (story_13, "node-http2-hpack/story_13.json"); + (story_14, "node-http2-hpack/story_14.json"); + (story_15, "node-http2-hpack/story_15.json"); + (story_16, "node-http2-hpack/story_16.json"); + (story_17, "node-http2-hpack/story_17.json"); + (story_18, "node-http2-hpack/story_18.json"); + (story_19, "node-http2-hpack/story_19.json"); + (story_20, "node-http2-hpack/story_20.json"); + (story_21, "node-http2-hpack/story_21.json"); + (story_22, "node-http2-hpack/story_22.json"); + (story_23, "node-http2-hpack/story_23.json"); + (story_24, "node-http2-hpack/story_24.json"); + (story_25, "node-http2-hpack/story_25.json"); + (story_26, "node-http2-hpack/story_26.json"); + (story_27, "node-http2-hpack/story_27.json"); + (story_28, "node-http2-hpack/story_28.json"); + (story_29, "node-http2-hpack/story_29.json"); + (story_30, "node-http2-hpack/story_30.json"); + (story_31, "node-http2-hpack/story_31.json"); + } +); + +fixture_mod!( + nghttp2_change_table_size => { + (story_00, "nghttp2-change-table-size/story_00.json"); + (story_01, "nghttp2-change-table-size/story_01.json"); + (story_02, "nghttp2-change-table-size/story_02.json"); + (story_03, "nghttp2-change-table-size/story_03.json"); + (story_04, "nghttp2-change-table-size/story_04.json"); + (story_05, "nghttp2-change-table-size/story_05.json"); + (story_06, "nghttp2-change-table-size/story_06.json"); + (story_07, "nghttp2-change-table-size/story_07.json"); + (story_08, "nghttp2-change-table-size/story_08.json"); + (story_09, "nghttp2-change-table-size/story_09.json"); + (story_10, "nghttp2-change-table-size/story_10.json"); + (story_11, "nghttp2-change-table-size/story_11.json"); + (story_12, "nghttp2-change-table-size/story_12.json"); + (story_13, "nghttp2-change-table-size/story_13.json"); + (story_14, "nghttp2-change-table-size/story_14.json"); + (story_15, "nghttp2-change-table-size/story_15.json"); + (story_16, "nghttp2-change-table-size/story_16.json"); + (story_17, "nghttp2-change-table-size/story_17.json"); + (story_18, "nghttp2-change-table-size/story_18.json"); + (story_19, "nghttp2-change-table-size/story_19.json"); + (story_20, "nghttp2-change-table-size/story_20.json"); + (story_21, "nghttp2-change-table-size/story_21.json"); + (story_22, "nghttp2-change-table-size/story_22.json"); + (story_23, "nghttp2-change-table-size/story_23.json"); + (story_24, "nghttp2-change-table-size/story_24.json"); + (story_25, "nghttp2-change-table-size/story_25.json"); + (story_26, "nghttp2-change-table-size/story_26.json"); + (story_27, "nghttp2-change-table-size/story_27.json"); + (story_28, "nghttp2-change-table-size/story_28.json"); + (story_29, "nghttp2-change-table-size/story_29.json"); + (story_30, "nghttp2-change-table-size/story_30.json"); + } +); + +fixture_mod!( + haskell_http2_static_huffman => { + (story_00, "haskell-http2-static-huffman/story_00.json"); + (story_01, "haskell-http2-static-huffman/story_01.json"); + (story_02, "haskell-http2-static-huffman/story_02.json"); + (story_03, "haskell-http2-static-huffman/story_03.json"); + (story_04, "haskell-http2-static-huffman/story_04.json"); + (story_05, "haskell-http2-static-huffman/story_05.json"); + (story_06, "haskell-http2-static-huffman/story_06.json"); + (story_07, "haskell-http2-static-huffman/story_07.json"); + (story_08, "haskell-http2-static-huffman/story_08.json"); + (story_09, "haskell-http2-static-huffman/story_09.json"); + (story_10, "haskell-http2-static-huffman/story_10.json"); + (story_11, "haskell-http2-static-huffman/story_11.json"); + (story_12, "haskell-http2-static-huffman/story_12.json"); + (story_13, "haskell-http2-static-huffman/story_13.json"); + (story_14, "haskell-http2-static-huffman/story_14.json"); + (story_15, "haskell-http2-static-huffman/story_15.json"); + (story_16, "haskell-http2-static-huffman/story_16.json"); + (story_17, "haskell-http2-static-huffman/story_17.json"); + (story_18, "haskell-http2-static-huffman/story_18.json"); + (story_19, "haskell-http2-static-huffman/story_19.json"); + (story_20, "haskell-http2-static-huffman/story_20.json"); + (story_21, "haskell-http2-static-huffman/story_21.json"); + (story_22, "haskell-http2-static-huffman/story_22.json"); + (story_23, "haskell-http2-static-huffman/story_23.json"); + (story_24, "haskell-http2-static-huffman/story_24.json"); + (story_25, "haskell-http2-static-huffman/story_25.json"); + (story_26, "haskell-http2-static-huffman/story_26.json"); + (story_27, "haskell-http2-static-huffman/story_27.json"); + (story_28, "haskell-http2-static-huffman/story_28.json"); + (story_29, "haskell-http2-static-huffman/story_29.json"); + (story_30, "haskell-http2-static-huffman/story_30.json"); + (story_31, "haskell-http2-static-huffman/story_31.json"); + } +); + +fixture_mod!( + haskell_http2_naive_huffman => { + (story_00, "haskell-http2-naive-huffman/story_00.json"); + (story_01, "haskell-http2-naive-huffman/story_01.json"); + (story_02, "haskell-http2-naive-huffman/story_02.json"); + (story_03, "haskell-http2-naive-huffman/story_03.json"); + (story_04, "haskell-http2-naive-huffman/story_04.json"); + (story_05, "haskell-http2-naive-huffman/story_05.json"); + (story_06, "haskell-http2-naive-huffman/story_06.json"); + (story_07, "haskell-http2-naive-huffman/story_07.json"); + (story_08, "haskell-http2-naive-huffman/story_08.json"); + (story_09, "haskell-http2-naive-huffman/story_09.json"); + (story_10, "haskell-http2-naive-huffman/story_10.json"); + (story_11, "haskell-http2-naive-huffman/story_11.json"); + (story_12, "haskell-http2-naive-huffman/story_12.json"); + (story_13, "haskell-http2-naive-huffman/story_13.json"); + (story_14, "haskell-http2-naive-huffman/story_14.json"); + (story_15, "haskell-http2-naive-huffman/story_15.json"); + (story_16, "haskell-http2-naive-huffman/story_16.json"); + (story_17, "haskell-http2-naive-huffman/story_17.json"); + (story_18, "haskell-http2-naive-huffman/story_18.json"); + (story_19, "haskell-http2-naive-huffman/story_19.json"); + (story_20, "haskell-http2-naive-huffman/story_20.json"); + (story_21, "haskell-http2-naive-huffman/story_21.json"); + (story_22, "haskell-http2-naive-huffman/story_22.json"); + (story_23, "haskell-http2-naive-huffman/story_23.json"); + (story_24, "haskell-http2-naive-huffman/story_24.json"); + (story_25, "haskell-http2-naive-huffman/story_25.json"); + (story_26, "haskell-http2-naive-huffman/story_26.json"); + (story_27, "haskell-http2-naive-huffman/story_27.json"); + (story_28, "haskell-http2-naive-huffman/story_28.json"); + (story_29, "haskell-http2-naive-huffman/story_29.json"); + (story_30, "haskell-http2-naive-huffman/story_30.json"); + (story_31, "haskell-http2-naive-huffman/story_31.json"); + } +); + +fixture_mod!( + haskell_http2_naive => { + (story_00, "haskell-http2-naive/story_00.json"); + (story_01, "haskell-http2-naive/story_01.json"); + (story_02, "haskell-http2-naive/story_02.json"); + (story_03, "haskell-http2-naive/story_03.json"); + (story_04, "haskell-http2-naive/story_04.json"); + (story_05, "haskell-http2-naive/story_05.json"); + (story_06, "haskell-http2-naive/story_06.json"); + (story_07, "haskell-http2-naive/story_07.json"); + (story_08, "haskell-http2-naive/story_08.json"); + (story_09, "haskell-http2-naive/story_09.json"); + (story_10, "haskell-http2-naive/story_10.json"); + (story_11, "haskell-http2-naive/story_11.json"); + (story_12, "haskell-http2-naive/story_12.json"); + (story_13, "haskell-http2-naive/story_13.json"); + (story_14, "haskell-http2-naive/story_14.json"); + (story_15, "haskell-http2-naive/story_15.json"); + (story_16, "haskell-http2-naive/story_16.json"); + (story_17, "haskell-http2-naive/story_17.json"); + (story_18, "haskell-http2-naive/story_18.json"); + (story_19, "haskell-http2-naive/story_19.json"); + (story_20, "haskell-http2-naive/story_20.json"); + (story_21, "haskell-http2-naive/story_21.json"); + (story_22, "haskell-http2-naive/story_22.json"); + (story_23, "haskell-http2-naive/story_23.json"); + (story_24, "haskell-http2-naive/story_24.json"); + (story_25, "haskell-http2-naive/story_25.json"); + (story_26, "haskell-http2-naive/story_26.json"); + (story_27, "haskell-http2-naive/story_27.json"); + (story_28, "haskell-http2-naive/story_28.json"); + (story_29, "haskell-http2-naive/story_29.json"); + (story_30, "haskell-http2-naive/story_30.json"); + (story_31, "haskell-http2-naive/story_31.json"); + } +); + +fixture_mod!( + haskell_http2_static => { + (story_00, "haskell-http2-static/story_00.json"); + (story_01, "haskell-http2-static/story_01.json"); + (story_02, "haskell-http2-static/story_02.json"); + (story_03, "haskell-http2-static/story_03.json"); + (story_04, "haskell-http2-static/story_04.json"); + (story_05, "haskell-http2-static/story_05.json"); + (story_06, "haskell-http2-static/story_06.json"); + (story_07, "haskell-http2-static/story_07.json"); + (story_08, "haskell-http2-static/story_08.json"); + (story_09, "haskell-http2-static/story_09.json"); + (story_10, "haskell-http2-static/story_10.json"); + (story_11, "haskell-http2-static/story_11.json"); + (story_12, "haskell-http2-static/story_12.json"); + (story_13, "haskell-http2-static/story_13.json"); + (story_14, "haskell-http2-static/story_14.json"); + (story_15, "haskell-http2-static/story_15.json"); + (story_16, "haskell-http2-static/story_16.json"); + (story_17, "haskell-http2-static/story_17.json"); + (story_18, "haskell-http2-static/story_18.json"); + (story_19, "haskell-http2-static/story_19.json"); + (story_20, "haskell-http2-static/story_20.json"); + (story_21, "haskell-http2-static/story_21.json"); + (story_22, "haskell-http2-static/story_22.json"); + (story_23, "haskell-http2-static/story_23.json"); + (story_24, "haskell-http2-static/story_24.json"); + (story_25, "haskell-http2-static/story_25.json"); + (story_26, "haskell-http2-static/story_26.json"); + (story_27, "haskell-http2-static/story_27.json"); + (story_28, "haskell-http2-static/story_28.json"); + (story_29, "haskell-http2-static/story_29.json"); + (story_30, "haskell-http2-static/story_30.json"); + (story_31, "haskell-http2-static/story_31.json"); + } +); + +fixture_mod!( + nghttp2 => { + (story_00, "nghttp2/story_00.json"); + (story_01, "nghttp2/story_01.json"); + (story_02, "nghttp2/story_02.json"); + (story_03, "nghttp2/story_03.json"); + (story_04, "nghttp2/story_04.json"); + (story_05, "nghttp2/story_05.json"); + (story_06, "nghttp2/story_06.json"); + (story_07, "nghttp2/story_07.json"); + (story_08, "nghttp2/story_08.json"); + (story_09, "nghttp2/story_09.json"); + (story_10, "nghttp2/story_10.json"); + (story_11, "nghttp2/story_11.json"); + (story_12, "nghttp2/story_12.json"); + (story_13, "nghttp2/story_13.json"); + (story_14, "nghttp2/story_14.json"); + (story_15, "nghttp2/story_15.json"); + (story_16, "nghttp2/story_16.json"); + (story_17, "nghttp2/story_17.json"); + (story_18, "nghttp2/story_18.json"); + (story_19, "nghttp2/story_19.json"); + (story_20, "nghttp2/story_20.json"); + (story_21, "nghttp2/story_21.json"); + (story_22, "nghttp2/story_22.json"); + (story_23, "nghttp2/story_23.json"); + (story_24, "nghttp2/story_24.json"); + (story_25, "nghttp2/story_25.json"); + (story_26, "nghttp2/story_26.json"); + (story_27, "nghttp2/story_27.json"); + (story_28, "nghttp2/story_28.json"); + (story_29, "nghttp2/story_29.json"); + (story_30, "nghttp2/story_30.json"); + (story_31, "nghttp2/story_31.json"); + } +); + +fixture_mod!( + haskell_http2_linear => { + (story_00, "haskell-http2-linear/story_00.json"); + (story_01, "haskell-http2-linear/story_01.json"); + (story_02, "haskell-http2-linear/story_02.json"); + (story_03, "haskell-http2-linear/story_03.json"); + (story_04, "haskell-http2-linear/story_04.json"); + (story_05, "haskell-http2-linear/story_05.json"); + (story_06, "haskell-http2-linear/story_06.json"); + (story_07, "haskell-http2-linear/story_07.json"); + (story_08, "haskell-http2-linear/story_08.json"); + (story_09, "haskell-http2-linear/story_09.json"); + (story_10, "haskell-http2-linear/story_10.json"); + (story_11, "haskell-http2-linear/story_11.json"); + (story_12, "haskell-http2-linear/story_12.json"); + (story_13, "haskell-http2-linear/story_13.json"); + (story_14, "haskell-http2-linear/story_14.json"); + (story_15, "haskell-http2-linear/story_15.json"); + (story_16, "haskell-http2-linear/story_16.json"); + (story_17, "haskell-http2-linear/story_17.json"); + (story_18, "haskell-http2-linear/story_18.json"); + (story_19, "haskell-http2-linear/story_19.json"); + (story_20, "haskell-http2-linear/story_20.json"); + (story_21, "haskell-http2-linear/story_21.json"); + (story_22, "haskell-http2-linear/story_22.json"); + (story_23, "haskell-http2-linear/story_23.json"); + (story_24, "haskell-http2-linear/story_24.json"); + (story_25, "haskell-http2-linear/story_25.json"); + (story_26, "haskell-http2-linear/story_26.json"); + (story_27, "haskell-http2-linear/story_27.json"); + (story_28, "haskell-http2-linear/story_28.json"); + (story_29, "haskell-http2-linear/story_29.json"); + (story_30, "haskell-http2-linear/story_30.json"); + (story_31, "haskell-http2-linear/story_31.json"); + } +); + +fixture_mod!( + go_hpack => { + (story_00, "go-hpack/story_00.json"); + (story_01, "go-hpack/story_01.json"); + (story_02, "go-hpack/story_02.json"); + (story_03, "go-hpack/story_03.json"); + (story_04, "go-hpack/story_04.json"); + (story_05, "go-hpack/story_05.json"); + (story_06, "go-hpack/story_06.json"); + (story_07, "go-hpack/story_07.json"); + (story_08, "go-hpack/story_08.json"); + (story_09, "go-hpack/story_09.json"); + (story_10, "go-hpack/story_10.json"); + (story_11, "go-hpack/story_11.json"); + (story_12, "go-hpack/story_12.json"); + (story_13, "go-hpack/story_13.json"); + (story_14, "go-hpack/story_14.json"); + (story_15, "go-hpack/story_15.json"); + (story_16, "go-hpack/story_16.json"); + (story_17, "go-hpack/story_17.json"); + (story_18, "go-hpack/story_18.json"); + (story_19, "go-hpack/story_19.json"); + (story_20, "go-hpack/story_20.json"); + (story_21, "go-hpack/story_21.json"); + (story_22, "go-hpack/story_22.json"); + (story_23, "go-hpack/story_23.json"); + (story_24, "go-hpack/story_24.json"); + (story_25, "go-hpack/story_25.json"); + (story_26, "go-hpack/story_26.json"); + (story_27, "go-hpack/story_27.json"); + (story_28, "go-hpack/story_28.json"); + (story_29, "go-hpack/story_29.json"); + (story_30, "go-hpack/story_30.json"); + (story_31, "go-hpack/story_31.json"); + } +); diff --git a/third_party/rust/h2/src/hpack/test/fuzz.rs b/third_party/rust/h2/src/hpack/test/fuzz.rs new file mode 100644 index 0000000000..ad0d47b6b1 --- /dev/null +++ b/third_party/rust/h2/src/hpack/test/fuzz.rs @@ -0,0 +1,365 @@ +use crate::hpack::{Decoder, Encoder, Header}; + +use http::header::{HeaderName, HeaderValue}; + +use bytes::BytesMut; +use quickcheck::{Arbitrary, Gen, QuickCheck, TestResult}; +use rand::distributions::Slice; +use rand::rngs::StdRng; +use rand::{thread_rng, Rng, SeedableRng}; + +use std::io::Cursor; + +const MAX_CHUNK: usize = 2 * 1024; + +#[test] +fn hpack_fuzz() { + let _ = env_logger::try_init(); + fn prop(fuzz: FuzzHpack) -> TestResult { + fuzz.run(); + TestResult::from_bool(true) + } + + QuickCheck::new() + .tests(100) + .quickcheck(prop as fn(FuzzHpack) -> TestResult) +} + +/* +// If wanting to test with a specific feed, uncomment and fill in the seed. +#[test] +fn hpack_fuzz_seeded() { + let _ = env_logger::try_init(); + let seed = [/* fill me in*/]; + FuzzHpack::new(seed).run(); +} +*/ + +#[derive(Debug, Clone)] +struct FuzzHpack { + // The set of headers to encode / decode + frames: Vec<HeaderFrame>, +} + +#[derive(Debug, Clone)] +struct HeaderFrame { + resizes: Vec<usize>, + headers: Vec<Header<Option<HeaderName>>>, +} + +impl FuzzHpack { + fn new(seed: [u8; 32]) -> FuzzHpack { + // Seed the RNG + let mut rng = StdRng::from_seed(seed); + + // Generates a bunch of source headers + let mut source: Vec<Header<Option<HeaderName>>> = vec![]; + + for _ in 0..2000 { + source.push(gen_header(&mut rng)); + } + + // Actual test run headers + let num: usize = rng.gen_range(40..500); + + let mut frames: Vec<HeaderFrame> = vec![]; + let mut added = 0; + + let skew: i32 = rng.gen_range(1..5); + + // Rough number of headers to add + while added < num { + let mut frame = HeaderFrame { + resizes: vec![], + headers: vec![], + }; + + match rng.gen_range(0..20) { + 0 => { + // Two resizes + let high = rng.gen_range(128..MAX_CHUNK * 2); + let low = rng.gen_range(0..high); + + frame.resizes.extend(&[low, high]); + } + 1..=3 => { + frame.resizes.push(rng.gen_range(128..MAX_CHUNK * 2)); + } + _ => {} + } + + let mut is_name_required = true; + + for _ in 0..rng.gen_range(1..(num - added) + 1) { + let x: f64 = rng.gen_range(0.0..1.0); + let x = x.powi(skew); + + let i = (x * source.len() as f64) as usize; + + let header = &source[i]; + match header { + Header::Field { name: None, .. } => { + if is_name_required { + continue; + } + } + Header::Field { .. } => { + is_name_required = false; + } + _ => { + // pseudos can't be followed by a header with no name + is_name_required = true; + } + } + + frame.headers.push(header.clone()); + + added += 1; + } + + frames.push(frame); + } + + FuzzHpack { frames } + } + + fn run(self) { + let frames = self.frames; + let mut expect = vec![]; + + let mut encoder = Encoder::default(); + let mut decoder = Decoder::default(); + + for frame in frames { + // build "expected" frames, such that decoding headers always + // includes a name + let mut prev_name = None; + for header in &frame.headers { + match header.clone().reify() { + Ok(h) => { + prev_name = match h { + Header::Field { ref name, .. } => Some(name.clone()), + _ => None, + }; + expect.push(h); + } + Err(value) => { + expect.push(Header::Field { + name: prev_name.as_ref().cloned().expect("previous header name"), + value, + }); + } + } + } + + let mut buf = BytesMut::new(); + + if let Some(max) = frame.resizes.iter().max() { + decoder.queue_size_update(*max); + } + + // Apply resizes + for resize in &frame.resizes { + encoder.update_max_size(*resize); + } + + encoder.encode(frame.headers, &mut buf); + + // Decode the chunk! + decoder + .decode(&mut Cursor::new(&mut buf), |h| { + let e = expect.remove(0); + assert_eq!(h, e); + }) + .expect("full decode"); + } + + assert_eq!(0, expect.len()); + } +} + +impl Arbitrary for FuzzHpack { + fn arbitrary(_: &mut Gen) -> Self { + FuzzHpack::new(thread_rng().gen()) + } +} + +fn gen_header(g: &mut StdRng) -> Header<Option<HeaderName>> { + use http::{Method, StatusCode}; + + if g.gen_ratio(1, 10) { + match g.gen_range(0u32..5) { + 0 => { + let value = gen_string(g, 4, 20); + Header::Authority(to_shared(value)) + } + 1 => { + let method = match g.gen_range(0u32..6) { + 0 => Method::GET, + 1 => Method::POST, + 2 => Method::PUT, + 3 => Method::PATCH, + 4 => Method::DELETE, + 5 => { + let n: usize = g.gen_range(3..7); + let bytes: Vec<u8> = (0..n) + .map(|_| *g.sample(Slice::new(b"ABCDEFGHIJKLMNOPQRSTUVWXYZ").unwrap())) + .collect(); + + Method::from_bytes(&bytes).unwrap() + } + _ => unreachable!(), + }; + + Header::Method(method) + } + 2 => { + let value = match g.gen_range(0u32..2) { + 0 => "http", + 1 => "https", + _ => unreachable!(), + }; + + Header::Scheme(to_shared(value.to_string())) + } + 3 => { + let value = match g.gen_range(0u32..100) { + 0 => "/".to_string(), + 1 => "/index.html".to_string(), + _ => gen_string(g, 2, 20), + }; + + Header::Path(to_shared(value)) + } + 4 => { + let status = (g.gen::<u16>() % 500) + 100; + + Header::Status(StatusCode::from_u16(status).unwrap()) + } + _ => unreachable!(), + } + } else { + let name = if g.gen_ratio(1, 10) { + None + } else { + Some(gen_header_name(g)) + }; + let mut value = gen_header_value(g); + + if g.gen_ratio(1, 30) { + value.set_sensitive(true); + } + + Header::Field { name, value } + } +} + +fn gen_header_name(g: &mut StdRng) -> HeaderName { + use http::header; + + if g.gen_ratio(1, 2) { + g.sample( + Slice::new(&[ + header::ACCEPT, + header::ACCEPT_CHARSET, + header::ACCEPT_ENCODING, + header::ACCEPT_LANGUAGE, + header::ACCEPT_RANGES, + header::ACCESS_CONTROL_ALLOW_CREDENTIALS, + header::ACCESS_CONTROL_ALLOW_HEADERS, + header::ACCESS_CONTROL_ALLOW_METHODS, + header::ACCESS_CONTROL_ALLOW_ORIGIN, + header::ACCESS_CONTROL_EXPOSE_HEADERS, + header::ACCESS_CONTROL_MAX_AGE, + header::ACCESS_CONTROL_REQUEST_HEADERS, + header::ACCESS_CONTROL_REQUEST_METHOD, + header::AGE, + header::ALLOW, + header::ALT_SVC, + header::AUTHORIZATION, + header::CACHE_CONTROL, + header::CONNECTION, + header::CONTENT_DISPOSITION, + header::CONTENT_ENCODING, + header::CONTENT_LANGUAGE, + header::CONTENT_LENGTH, + header::CONTENT_LOCATION, + header::CONTENT_RANGE, + header::CONTENT_SECURITY_POLICY, + header::CONTENT_SECURITY_POLICY_REPORT_ONLY, + header::CONTENT_TYPE, + header::COOKIE, + header::DNT, + header::DATE, + header::ETAG, + header::EXPECT, + header::EXPIRES, + header::FORWARDED, + header::FROM, + header::HOST, + header::IF_MATCH, + header::IF_MODIFIED_SINCE, + header::IF_NONE_MATCH, + header::IF_RANGE, + header::IF_UNMODIFIED_SINCE, + header::LAST_MODIFIED, + header::LINK, + header::LOCATION, + header::MAX_FORWARDS, + header::ORIGIN, + header::PRAGMA, + header::PROXY_AUTHENTICATE, + header::PROXY_AUTHORIZATION, + header::PUBLIC_KEY_PINS, + header::PUBLIC_KEY_PINS_REPORT_ONLY, + header::RANGE, + header::REFERER, + header::REFERRER_POLICY, + header::REFRESH, + header::RETRY_AFTER, + header::SERVER, + header::SET_COOKIE, + header::STRICT_TRANSPORT_SECURITY, + header::TE, + header::TRAILER, + header::TRANSFER_ENCODING, + header::USER_AGENT, + header::UPGRADE, + header::UPGRADE_INSECURE_REQUESTS, + header::VARY, + header::VIA, + header::WARNING, + header::WWW_AUTHENTICATE, + header::X_CONTENT_TYPE_OPTIONS, + header::X_DNS_PREFETCH_CONTROL, + header::X_FRAME_OPTIONS, + header::X_XSS_PROTECTION, + ]) + .unwrap(), + ) + .clone() + } else { + let value = gen_string(g, 1, 25); + HeaderName::from_bytes(value.as_bytes()).unwrap() + } +} + +fn gen_header_value(g: &mut StdRng) -> HeaderValue { + let value = gen_string(g, 0, 70); + HeaderValue::from_bytes(value.as_bytes()).unwrap() +} + +fn gen_string(g: &mut StdRng, min: usize, max: usize) -> String { + let bytes: Vec<_> = (min..max) + .map(|_| { + // Chars to pick from + *g.sample(Slice::new(b"ABCDEFGHIJKLMNOPQRSTUVabcdefghilpqrstuvwxyz----").unwrap()) + }) + .collect(); + + String::from_utf8(bytes).unwrap() +} + +fn to_shared(src: String) -> crate::hpack::BytesStr { + crate::hpack::BytesStr::from(src.as_str()) +} diff --git a/third_party/rust/h2/src/hpack/test/mod.rs b/third_party/rust/h2/src/hpack/test/mod.rs new file mode 100644 index 0000000000..9b1f27169d --- /dev/null +++ b/third_party/rust/h2/src/hpack/test/mod.rs @@ -0,0 +1,2 @@ +mod fixture; +mod fuzz; diff --git a/third_party/rust/h2/src/lib.rs b/third_party/rust/h2/src/lib.rs new file mode 100644 index 0000000000..376d15c9ae --- /dev/null +++ b/third_party/rust/h2/src/lib.rs @@ -0,0 +1,135 @@ +//! An asynchronous, HTTP/2 server and client implementation. +//! +//! This library implements the [HTTP/2] specification. The implementation is +//! asynchronous, using [futures] as the basis for the API. The implementation +//! is also decoupled from TCP or TLS details. The user must handle ALPN and +//! HTTP/1.1 upgrades themselves. +//! +//! # Getting started +//! +//! Add the following to your `Cargo.toml` file: +//! +//! ```toml +//! [dependencies] +//! h2 = "0.3" +//! ``` +//! +//! # Layout +//! +//! The crate is split into [`client`] and [`server`] modules. Types that are +//! common to both clients and servers are located at the root of the crate. +//! +//! See module level documentation for more details on how to use `h2`. +//! +//! # Handshake +//! +//! Both the client and the server require a connection to already be in a state +//! ready to start the HTTP/2 handshake. This library does not provide +//! facilities to do this. +//! +//! There are three ways to reach an appropriate state to start the HTTP/2 +//! handshake. +//! +//! * Opening an HTTP/1.1 connection and performing an [upgrade]. +//! * Opening a connection with TLS and use ALPN to negotiate the protocol. +//! * Open a connection with prior knowledge, i.e. both the client and the +//! server assume that the connection is immediately ready to start the +//! HTTP/2 handshake once opened. +//! +//! Once the connection is ready to start the HTTP/2 handshake, it can be +//! passed to [`server::handshake`] or [`client::handshake`]. At this point, the +//! library will start the handshake process, which consists of: +//! +//! * The client sends the connection preface (a predefined sequence of 24 +//! octets). +//! * Both the client and the server sending a SETTINGS frame. +//! +//! See the [Starting HTTP/2] in the specification for more details. +//! +//! # Flow control +//! +//! [Flow control] is a fundamental feature of HTTP/2. The `h2` library +//! exposes flow control to the user. +//! +//! An HTTP/2 client or server may not send unlimited data to the peer. When a +//! stream is initiated, both the client and the server are provided with an +//! initial window size for that stream. A window size is the number of bytes +//! the endpoint can send to the peer. At any point in time, the peer may +//! increase this window size by sending a `WINDOW_UPDATE` frame. Once a client +//! or server has sent data filling the window for a stream, no further data may +//! be sent on that stream until the peer increases the window. +//! +//! There is also a **connection level** window governing data sent across all +//! streams. +//! +//! Managing flow control for inbound data is done through [`FlowControl`]. +//! Managing flow control for outbound data is done through [`SendStream`]. See +//! the struct level documentation for those two types for more details. +//! +//! [HTTP/2]: https://http2.github.io/ +//! [futures]: https://docs.rs/futures/ +//! [`client`]: client/index.html +//! [`server`]: server/index.html +//! [Flow control]: http://httpwg.org/specs/rfc7540.html#FlowControl +//! [`FlowControl`]: struct.FlowControl.html +//! [`SendStream`]: struct.SendStream.html +//! [Starting HTTP/2]: http://httpwg.org/specs/rfc7540.html#starting +//! [upgrade]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism +//! [`server::handshake`]: server/fn.handshake.html +//! [`client::handshake`]: client/fn.handshake.html + +#![doc(html_root_url = "https://docs.rs/h2/0.3.15")] +#![deny(missing_debug_implementations, missing_docs)] +#![cfg_attr(test, deny(warnings))] + +macro_rules! proto_err { + (conn: $($msg:tt)+) => { + tracing::debug!("connection error PROTOCOL_ERROR -- {};", format_args!($($msg)+)) + }; + (stream: $($msg:tt)+) => { + tracing::debug!("stream error PROTOCOL_ERROR -- {};", format_args!($($msg)+)) + }; +} + +macro_rules! ready { + ($e:expr) => { + match $e { + ::std::task::Poll::Ready(r) => r, + ::std::task::Poll::Pending => return ::std::task::Poll::Pending, + } + }; +} + +#[cfg_attr(feature = "unstable", allow(missing_docs))] +mod codec; +mod error; +mod hpack; + +#[cfg(not(feature = "unstable"))] +mod proto; + +#[cfg(feature = "unstable")] +#[allow(missing_docs)] +pub mod proto; + +#[cfg(not(feature = "unstable"))] +mod frame; + +#[cfg(feature = "unstable")] +#[allow(missing_docs)] +pub mod frame; + +pub mod client; +pub mod ext; +pub mod server; +mod share; + +#[cfg(fuzzing)] +#[cfg_attr(feature = "unstable", allow(missing_docs))] +pub mod fuzz_bridge; + +pub use crate::error::{Error, Reason}; +pub use crate::share::{FlowControl, Ping, PingPong, Pong, RecvStream, SendStream, StreamId}; + +#[cfg(feature = "unstable")] +pub use codec::{Codec, SendError, UserError}; diff --git a/third_party/rust/h2/src/proto/connection.rs b/third_party/rust/h2/src/proto/connection.rs new file mode 100644 index 0000000000..cd011a1d58 --- /dev/null +++ b/third_party/rust/h2/src/proto/connection.rs @@ -0,0 +1,583 @@ +use crate::codec::UserError; +use crate::frame::{Reason, StreamId}; +use crate::{client, frame, server}; + +use crate::frame::DEFAULT_INITIAL_WINDOW_SIZE; +use crate::proto::*; + +use bytes::{Buf, Bytes}; +use futures_core::Stream; +use std::io; +use std::marker::PhantomData; +use std::pin::Pin; +use std::task::{Context, Poll}; +use std::time::Duration; +use tokio::io::{AsyncRead, AsyncWrite}; + +/// An H2 connection +#[derive(Debug)] +pub(crate) struct Connection<T, P, B: Buf = Bytes> +where + P: Peer, +{ + /// Read / write frame values + codec: Codec<T, Prioritized<B>>, + + inner: ConnectionInner<P, B>, +} + +// Extracted part of `Connection` which does not depend on `T`. Reduces the amount of duplicated +// method instantiations. +#[derive(Debug)] +struct ConnectionInner<P, B: Buf = Bytes> +where + P: Peer, +{ + /// Tracks the connection level state transitions. + state: State, + + /// An error to report back once complete. + /// + /// This exists separately from State in order to support + /// graceful shutdown. + error: Option<frame::GoAway>, + + /// Pending GOAWAY frames to write. + go_away: GoAway, + + /// Ping/pong handler + ping_pong: PingPong, + + /// Connection settings + settings: Settings, + + /// Stream state handler + streams: Streams<B, P>, + + /// A `tracing` span tracking the lifetime of the connection. + span: tracing::Span, + + /// Client or server + _phantom: PhantomData<P>, +} + +struct DynConnection<'a, B: Buf = Bytes> { + state: &'a mut State, + + go_away: &'a mut GoAway, + + streams: DynStreams<'a, B>, + + error: &'a mut Option<frame::GoAway>, + + ping_pong: &'a mut PingPong, +} + +#[derive(Debug, Clone)] +pub(crate) struct Config { + pub next_stream_id: StreamId, + pub initial_max_send_streams: usize, + pub max_send_buffer_size: usize, + pub reset_stream_duration: Duration, + pub reset_stream_max: usize, + pub settings: frame::Settings, +} + +#[derive(Debug)] +enum State { + /// Currently open in a sane state + Open, + + /// The codec must be flushed + Closing(Reason, Initiator), + + /// In a closed state + Closed(Reason, Initiator), +} + +impl<T, P, B> Connection<T, P, B> +where + T: AsyncRead + AsyncWrite + Unpin, + P: Peer, + B: Buf, +{ + pub fn new(codec: Codec<T, Prioritized<B>>, config: Config) -> Connection<T, P, B> { + fn streams_config(config: &Config) -> streams::Config { + streams::Config { + local_init_window_sz: config + .settings + .initial_window_size() + .unwrap_or(DEFAULT_INITIAL_WINDOW_SIZE), + initial_max_send_streams: config.initial_max_send_streams, + local_max_buffer_size: config.max_send_buffer_size, + local_next_stream_id: config.next_stream_id, + local_push_enabled: config.settings.is_push_enabled().unwrap_or(true), + extended_connect_protocol_enabled: config + .settings + .is_extended_connect_protocol_enabled() + .unwrap_or(false), + local_reset_duration: config.reset_stream_duration, + local_reset_max: config.reset_stream_max, + remote_init_window_sz: DEFAULT_INITIAL_WINDOW_SIZE, + remote_max_initiated: config + .settings + .max_concurrent_streams() + .map(|max| max as usize), + } + } + let streams = Streams::new(streams_config(&config)); + Connection { + codec, + inner: ConnectionInner { + state: State::Open, + error: None, + go_away: GoAway::new(), + ping_pong: PingPong::new(), + settings: Settings::new(config.settings), + streams, + span: tracing::debug_span!("Connection", peer = %P::NAME), + _phantom: PhantomData, + }, + } + } + + /// connection flow control + pub(crate) fn set_target_window_size(&mut self, size: WindowSize) { + self.inner.streams.set_target_connection_window_size(size); + } + + /// Send a new SETTINGS frame with an updated initial window size. + pub(crate) fn set_initial_window_size(&mut self, size: WindowSize) -> Result<(), UserError> { + let mut settings = frame::Settings::default(); + settings.set_initial_window_size(Some(size)); + self.inner.settings.send_settings(settings) + } + + /// Send a new SETTINGS frame with extended CONNECT protocol enabled. + pub(crate) fn set_enable_connect_protocol(&mut self) -> Result<(), UserError> { + let mut settings = frame::Settings::default(); + settings.set_enable_connect_protocol(Some(1)); + self.inner.settings.send_settings(settings) + } + + /// Returns the maximum number of concurrent streams that may be initiated + /// by this peer. + pub(crate) fn max_send_streams(&self) -> usize { + self.inner.streams.max_send_streams() + } + + /// Returns the maximum number of concurrent streams that may be initiated + /// by the remote peer. + pub(crate) fn max_recv_streams(&self) -> usize { + self.inner.streams.max_recv_streams() + } + + /// Returns `Ready` when the connection is ready to receive a frame. + /// + /// Returns `Error` as this may raise errors that are caused by delayed + /// processing of received frames. + fn poll_ready(&mut self, cx: &mut Context) -> Poll<Result<(), Error>> { + let _e = self.inner.span.enter(); + let span = tracing::trace_span!("poll_ready"); + let _e = span.enter(); + // The order of these calls don't really matter too much + ready!(self.inner.ping_pong.send_pending_pong(cx, &mut self.codec))?; + ready!(self.inner.ping_pong.send_pending_ping(cx, &mut self.codec))?; + ready!(self + .inner + .settings + .poll_send(cx, &mut self.codec, &mut self.inner.streams))?; + ready!(self.inner.streams.send_pending_refusal(cx, &mut self.codec))?; + + Poll::Ready(Ok(())) + } + + /// Send any pending GOAWAY frames. + /// + /// This will return `Some(reason)` if the connection should be closed + /// afterwards. If this is a graceful shutdown, this returns `None`. + fn poll_go_away(&mut self, cx: &mut Context) -> Poll<Option<io::Result<Reason>>> { + self.inner.go_away.send_pending_go_away(cx, &mut self.codec) + } + + pub fn go_away_from_user(&mut self, e: Reason) { + self.inner.as_dyn().go_away_from_user(e) + } + + fn take_error(&mut self, ours: Reason, initiator: Initiator) -> Result<(), Error> { + let (debug_data, theirs) = self + .inner + .error + .take() + .as_ref() + .map_or((Bytes::new(), Reason::NO_ERROR), |frame| { + (frame.debug_data().clone(), frame.reason()) + }); + + match (ours, theirs) { + (Reason::NO_ERROR, Reason::NO_ERROR) => return Ok(()), + (ours, Reason::NO_ERROR) => Err(Error::GoAway(Bytes::new(), ours, initiator)), + // If both sides reported an error, give their + // error back to th user. We assume our error + // was a consequence of their error, and less + // important. + (_, theirs) => Err(Error::remote_go_away(debug_data, theirs)), + } + } + + /// Closes the connection by transitioning to a GOAWAY state + /// iff there are no streams or references + pub fn maybe_close_connection_if_no_streams(&mut self) { + // If we poll() and realize that there are no streams or references + // then we can close the connection by transitioning to GOAWAY + if !self.inner.streams.has_streams_or_other_references() { + self.inner.as_dyn().go_away_now(Reason::NO_ERROR); + } + } + + pub(crate) fn take_user_pings(&mut self) -> Option<UserPings> { + self.inner.ping_pong.take_user_pings() + } + + /// Advances the internal state of the connection. + pub fn poll(&mut self, cx: &mut Context) -> Poll<Result<(), Error>> { + // XXX(eliza): cloning the span is unfortunately necessary here in + // order to placate the borrow checker — `self` is mutably borrowed by + // `poll2`, which means that we can't borrow `self.span` to enter it. + // The clone is just an atomic ref bump. + let span = self.inner.span.clone(); + let _e = span.enter(); + let span = tracing::trace_span!("poll"); + let _e = span.enter(); + + loop { + tracing::trace!(connection.state = ?self.inner.state); + // TODO: probably clean up this glob of code + match self.inner.state { + // When open, continue to poll a frame + State::Open => { + let result = match self.poll2(cx) { + Poll::Ready(result) => result, + // The connection is not ready to make progress + Poll::Pending => { + // Ensure all window updates have been sent. + // + // This will also handle flushing `self.codec` + ready!(self.inner.streams.poll_complete(cx, &mut self.codec))?; + + if (self.inner.error.is_some() + || self.inner.go_away.should_close_on_idle()) + && !self.inner.streams.has_streams() + { + self.inner.as_dyn().go_away_now(Reason::NO_ERROR); + continue; + } + + return Poll::Pending; + } + }; + + self.inner.as_dyn().handle_poll2_result(result)? + } + State::Closing(reason, initiator) => { + tracing::trace!("connection closing after flush"); + // Flush/shutdown the codec + ready!(self.codec.shutdown(cx))?; + + // Transition the state to error + self.inner.state = State::Closed(reason, initiator); + } + State::Closed(reason, initiator) => { + return Poll::Ready(self.take_error(reason, initiator)); + } + } + } + } + + fn poll2(&mut self, cx: &mut Context) -> Poll<Result<(), Error>> { + // This happens outside of the loop to prevent needing to do a clock + // check and then comparison of the queue possibly multiple times a + // second (and thus, the clock wouldn't have changed enough to matter). + self.clear_expired_reset_streams(); + + loop { + // First, ensure that the `Connection` is able to receive a frame + // + // The order here matters: + // - poll_go_away may buffer a graceful shutdown GOAWAY frame + // - If it has, we've also added a PING to be sent in poll_ready + if let Some(reason) = ready!(self.poll_go_away(cx)?) { + if self.inner.go_away.should_close_now() { + if self.inner.go_away.is_user_initiated() { + // A user initiated abrupt shutdown shouldn't return + // the same error back to the user. + return Poll::Ready(Ok(())); + } else { + return Poll::Ready(Err(Error::library_go_away(reason))); + } + } + // Only NO_ERROR should be waiting for idle + debug_assert_eq!( + reason, + Reason::NO_ERROR, + "graceful GOAWAY should be NO_ERROR" + ); + } + ready!(self.poll_ready(cx))?; + + match self + .inner + .as_dyn() + .recv_frame(ready!(Pin::new(&mut self.codec).poll_next(cx)?))? + { + ReceivedFrame::Settings(frame) => { + self.inner.settings.recv_settings( + frame, + &mut self.codec, + &mut self.inner.streams, + )?; + } + ReceivedFrame::Continue => (), + ReceivedFrame::Done => { + return Poll::Ready(Ok(())); + } + } + } + } + + fn clear_expired_reset_streams(&mut self) { + self.inner.streams.clear_expired_reset_streams(); + } +} + +impl<P, B> ConnectionInner<P, B> +where + P: Peer, + B: Buf, +{ + fn as_dyn(&mut self) -> DynConnection<'_, B> { + let ConnectionInner { + state, + go_away, + streams, + error, + ping_pong, + .. + } = self; + let streams = streams.as_dyn(); + DynConnection { + state, + go_away, + streams, + error, + ping_pong, + } + } +} + +impl<B> DynConnection<'_, B> +where + B: Buf, +{ + fn go_away(&mut self, id: StreamId, e: Reason) { + let frame = frame::GoAway::new(id, e); + self.streams.send_go_away(id); + self.go_away.go_away(frame); + } + + fn go_away_now(&mut self, e: Reason) { + let last_processed_id = self.streams.last_processed_id(); + let frame = frame::GoAway::new(last_processed_id, e); + self.go_away.go_away_now(frame); + } + + fn go_away_from_user(&mut self, e: Reason) { + let last_processed_id = self.streams.last_processed_id(); + let frame = frame::GoAway::new(last_processed_id, e); + self.go_away.go_away_from_user(frame); + + // Notify all streams of reason we're abruptly closing. + self.streams.handle_error(Error::user_go_away(e)); + } + + fn handle_poll2_result(&mut self, result: Result<(), Error>) -> Result<(), Error> { + match result { + // The connection has shutdown normally + Ok(()) => { + *self.state = State::Closing(Reason::NO_ERROR, Initiator::Library); + Ok(()) + } + // Attempting to read a frame resulted in a connection level + // error. This is handled by setting a GOAWAY frame followed by + // terminating the connection. + Err(Error::GoAway(debug_data, reason, initiator)) => { + let e = Error::GoAway(debug_data, reason, initiator); + tracing::debug!(error = ?e, "Connection::poll; connection error"); + + // We may have already sent a GOAWAY for this error, + // if so, don't send another, just flush and close up. + if self + .go_away + .going_away() + .map_or(false, |frame| frame.reason() == reason) + { + tracing::trace!(" -> already going away"); + *self.state = State::Closing(reason, initiator); + return Ok(()); + } + + // Reset all active streams + self.streams.handle_error(e); + self.go_away_now(reason); + Ok(()) + } + // Attempting to read a frame resulted in a stream level error. + // This is handled by resetting the frame then trying to read + // another frame. + Err(Error::Reset(id, reason, initiator)) => { + debug_assert_eq!(initiator, Initiator::Library); + tracing::trace!(?id, ?reason, "stream error"); + self.streams.send_reset(id, reason); + Ok(()) + } + // Attempting to read a frame resulted in an I/O error. All + // active streams must be reset. + // + // TODO: Are I/O errors recoverable? + Err(Error::Io(e, inner)) => { + tracing::debug!(error = ?e, "Connection::poll; IO error"); + let e = Error::Io(e, inner); + + // Reset all active streams + self.streams.handle_error(e.clone()); + + // Return the error + Err(e) + } + } + } + + fn recv_frame(&mut self, frame: Option<Frame>) -> Result<ReceivedFrame, Error> { + use crate::frame::Frame::*; + match frame { + Some(Headers(frame)) => { + tracing::trace!(?frame, "recv HEADERS"); + self.streams.recv_headers(frame)?; + } + Some(Data(frame)) => { + tracing::trace!(?frame, "recv DATA"); + self.streams.recv_data(frame)?; + } + Some(Reset(frame)) => { + tracing::trace!(?frame, "recv RST_STREAM"); + self.streams.recv_reset(frame)?; + } + Some(PushPromise(frame)) => { + tracing::trace!(?frame, "recv PUSH_PROMISE"); + self.streams.recv_push_promise(frame)?; + } + Some(Settings(frame)) => { + tracing::trace!(?frame, "recv SETTINGS"); + return Ok(ReceivedFrame::Settings(frame)); + } + Some(GoAway(frame)) => { + tracing::trace!(?frame, "recv GOAWAY"); + // This should prevent starting new streams, + // but should allow continuing to process current streams + // until they are all EOS. Once they are, State should + // transition to GoAway. + self.streams.recv_go_away(&frame)?; + *self.error = Some(frame); + } + Some(Ping(frame)) => { + tracing::trace!(?frame, "recv PING"); + let status = self.ping_pong.recv_ping(frame); + if status.is_shutdown() { + assert!( + self.go_away.is_going_away(), + "received unexpected shutdown ping" + ); + + let last_processed_id = self.streams.last_processed_id(); + self.go_away(last_processed_id, Reason::NO_ERROR); + } + } + Some(WindowUpdate(frame)) => { + tracing::trace!(?frame, "recv WINDOW_UPDATE"); + self.streams.recv_window_update(frame)?; + } + Some(Priority(frame)) => { + tracing::trace!(?frame, "recv PRIORITY"); + // TODO: handle + } + None => { + tracing::trace!("codec closed"); + self.streams.recv_eof(false).expect("mutex poisoned"); + return Ok(ReceivedFrame::Done); + } + } + Ok(ReceivedFrame::Continue) + } +} + +enum ReceivedFrame { + Settings(frame::Settings), + Continue, + Done, +} + +impl<T, B> Connection<T, client::Peer, B> +where + T: AsyncRead + AsyncWrite, + B: Buf, +{ + pub(crate) fn streams(&self) -> &Streams<B, client::Peer> { + &self.inner.streams + } +} + +impl<T, B> Connection<T, server::Peer, B> +where + T: AsyncRead + AsyncWrite + Unpin, + B: Buf, +{ + pub fn next_incoming(&mut self) -> Option<StreamRef<B>> { + self.inner.streams.next_incoming() + } + + // Graceful shutdown only makes sense for server peers. + pub fn go_away_gracefully(&mut self) { + if self.inner.go_away.is_going_away() { + // No reason to start a new one. + return; + } + + // According to http://httpwg.org/specs/rfc7540.html#GOAWAY: + // + // > A server that is attempting to gracefully shut down a connection + // > SHOULD send an initial GOAWAY frame with the last stream + // > identifier set to 2^31-1 and a NO_ERROR code. This signals to the + // > client that a shutdown is imminent and that initiating further + // > requests is prohibited. After allowing time for any in-flight + // > stream creation (at least one round-trip time), the server can + // > send another GOAWAY frame with an updated last stream identifier. + // > This ensures that a connection can be cleanly shut down without + // > losing requests. + self.inner.as_dyn().go_away(StreamId::MAX, Reason::NO_ERROR); + + // We take the advice of waiting 1 RTT literally, and wait + // for a pong before proceeding. + self.inner.ping_pong.ping_shutdown(); + } +} + +impl<T, P, B> Drop for Connection<T, P, B> +where + P: Peer, + B: Buf, +{ + fn drop(&mut self) { + // Ignore errors as this indicates that the mutex is poisoned. + let _ = self.inner.streams.recv_eof(true); + } +} diff --git a/third_party/rust/h2/src/proto/error.rs b/third_party/rust/h2/src/proto/error.rs new file mode 100644 index 0000000000..1972372637 --- /dev/null +++ b/third_party/rust/h2/src/proto/error.rs @@ -0,0 +1,87 @@ +use crate::codec::SendError; +use crate::frame::{Reason, StreamId}; + +use bytes::Bytes; +use std::fmt; +use std::io; + +/// Either an H2 reason or an I/O error +#[derive(Clone, Debug)] +pub enum Error { + Reset(StreamId, Reason, Initiator), + GoAway(Bytes, Reason, Initiator), + Io(io::ErrorKind, Option<String>), +} + +#[derive(Clone, Copy, Debug, PartialEq)] +pub enum Initiator { + User, + Library, + Remote, +} + +impl Error { + pub(crate) fn is_local(&self) -> bool { + match *self { + Self::Reset(_, _, initiator) | Self::GoAway(_, _, initiator) => initiator.is_local(), + Self::Io(..) => true, + } + } + + pub(crate) fn user_go_away(reason: Reason) -> Self { + Self::GoAway(Bytes::new(), reason, Initiator::User) + } + + pub(crate) fn library_reset(stream_id: StreamId, reason: Reason) -> Self { + Self::Reset(stream_id, reason, Initiator::Library) + } + + pub(crate) fn library_go_away(reason: Reason) -> Self { + Self::GoAway(Bytes::new(), reason, Initiator::Library) + } + + pub(crate) fn remote_reset(stream_id: StreamId, reason: Reason) -> Self { + Self::Reset(stream_id, reason, Initiator::Remote) + } + + pub(crate) fn remote_go_away(debug_data: Bytes, reason: Reason) -> Self { + Self::GoAway(debug_data, reason, Initiator::Remote) + } +} + +impl Initiator { + fn is_local(&self) -> bool { + match *self { + Self::User | Self::Library => true, + Self::Remote => false, + } + } +} + +impl fmt::Display for Error { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + match *self { + Self::Reset(_, reason, _) | Self::GoAway(_, reason, _) => reason.fmt(fmt), + Self::Io(_, Some(ref inner)) => inner.fmt(fmt), + Self::Io(kind, None) => io::Error::from(kind).fmt(fmt), + } + } +} + +impl From<io::ErrorKind> for Error { + fn from(src: io::ErrorKind) -> Self { + Error::Io(src.into(), None) + } +} + +impl From<io::Error> for Error { + fn from(src: io::Error) -> Self { + Error::Io(src.kind(), src.get_ref().map(|inner| inner.to_string())) + } +} + +impl From<Error> for SendError { + fn from(src: Error) -> Self { + Self::Connection(src) + } +} diff --git a/third_party/rust/h2/src/proto/go_away.rs b/third_party/rust/h2/src/proto/go_away.rs new file mode 100644 index 0000000000..7594278784 --- /dev/null +++ b/third_party/rust/h2/src/proto/go_away.rs @@ -0,0 +1,158 @@ +use crate::codec::Codec; +use crate::frame::{self, Reason, StreamId}; + +use bytes::Buf; +use std::io; +use std::task::{Context, Poll}; +use tokio::io::AsyncWrite; + +/// Manages our sending of GOAWAY frames. +#[derive(Debug)] +pub(super) struct GoAway { + /// Whether the connection should close now, or wait until idle. + close_now: bool, + /// Records if we've sent any GOAWAY before. + going_away: Option<GoingAway>, + /// Whether the user started the GOAWAY by calling `abrupt_shutdown`. + is_user_initiated: bool, + /// A GOAWAY frame that must be buffered in the Codec immediately. + pending: Option<frame::GoAway>, +} + +/// Keeps a memory of any GOAWAY frames we've sent before. +/// +/// This looks very similar to a `frame::GoAway`, but is a separate type. Why? +/// Mostly for documentation purposes. This type is to record status. If it +/// were a `frame::GoAway`, it might appear like we eventually wanted to +/// serialize it. We **only** want to be able to look up these fields at a +/// later time. +/// +/// (Technically, `frame::GoAway` should gain an opaque_debug_data field as +/// well, and we wouldn't want to save that here to accidentally dump in logs, +/// or waste struct space.) +#[derive(Debug)] +pub(crate) struct GoingAway { + /// Stores the highest stream ID of a GOAWAY that has been sent. + /// + /// It's illegal to send a subsequent GOAWAY with a higher ID. + last_processed_id: StreamId, + + /// Records the error code of any GOAWAY frame sent. + reason: Reason, +} + +impl GoAway { + pub fn new() -> Self { + GoAway { + close_now: false, + going_away: None, + is_user_initiated: false, + pending: None, + } + } + + /// Enqueue a GOAWAY frame to be written. + /// + /// The connection is expected to continue to run until idle. + pub fn go_away(&mut self, f: frame::GoAway) { + if let Some(ref going_away) = self.going_away { + assert!( + f.last_stream_id() <= going_away.last_processed_id, + "GOAWAY stream IDs shouldn't be higher; \ + last_processed_id = {:?}, f.last_stream_id() = {:?}", + going_away.last_processed_id, + f.last_stream_id(), + ); + } + + self.going_away = Some(GoingAway { + last_processed_id: f.last_stream_id(), + reason: f.reason(), + }); + self.pending = Some(f); + } + + pub fn go_away_now(&mut self, f: frame::GoAway) { + self.close_now = true; + if let Some(ref going_away) = self.going_away { + // Prevent sending the same GOAWAY twice. + if going_away.last_processed_id == f.last_stream_id() && going_away.reason == f.reason() + { + return; + } + } + self.go_away(f); + } + + pub fn go_away_from_user(&mut self, f: frame::GoAway) { + self.is_user_initiated = true; + self.go_away_now(f); + } + + /// Return if a GOAWAY has ever been scheduled. + pub fn is_going_away(&self) -> bool { + self.going_away.is_some() + } + + pub fn is_user_initiated(&self) -> bool { + self.is_user_initiated + } + + /// Returns the going away info, if any. + pub fn going_away(&self) -> Option<&GoingAway> { + self.going_away.as_ref() + } + + /// Returns if the connection should close now, or wait until idle. + pub fn should_close_now(&self) -> bool { + self.pending.is_none() && self.close_now + } + + /// Returns if the connection should be closed when idle. + pub fn should_close_on_idle(&self) -> bool { + !self.close_now + && self + .going_away + .as_ref() + .map(|g| g.last_processed_id != StreamId::MAX) + .unwrap_or(false) + } + + /// Try to write a pending GOAWAY frame to the buffer. + /// + /// If a frame is written, the `Reason` of the GOAWAY is returned. + pub fn send_pending_go_away<T, B>( + &mut self, + cx: &mut Context, + dst: &mut Codec<T, B>, + ) -> Poll<Option<io::Result<Reason>>> + where + T: AsyncWrite + Unpin, + B: Buf, + { + if let Some(frame) = self.pending.take() { + if !dst.poll_ready(cx)?.is_ready() { + self.pending = Some(frame); + return Poll::Pending; + } + + let reason = frame.reason(); + dst.buffer(frame.into()).expect("invalid GOAWAY frame"); + + return Poll::Ready(Some(Ok(reason))); + } else if self.should_close_now() { + return match self.going_away().map(|going_away| going_away.reason) { + Some(reason) => Poll::Ready(Some(Ok(reason))), + None => Poll::Ready(None), + }; + } + + Poll::Ready(None) + } +} + +impl GoingAway { + pub(crate) fn reason(&self) -> Reason { + self.reason + } +} diff --git a/third_party/rust/h2/src/proto/mod.rs b/third_party/rust/h2/src/proto/mod.rs new file mode 100644 index 0000000000..5ec7bf992a --- /dev/null +++ b/third_party/rust/h2/src/proto/mod.rs @@ -0,0 +1,36 @@ +mod connection; +mod error; +mod go_away; +mod peer; +mod ping_pong; +mod settings; +mod streams; + +pub(crate) use self::connection::{Config, Connection}; +pub use self::error::{Error, Initiator}; +pub(crate) use self::peer::{Dyn as DynPeer, Peer}; +pub(crate) use self::ping_pong::UserPings; +pub(crate) use self::streams::{DynStreams, OpaqueStreamRef, StreamRef, Streams}; +pub(crate) use self::streams::{Open, PollReset, Prioritized}; + +use crate::codec::Codec; + +use self::go_away::GoAway; +use self::ping_pong::PingPong; +use self::settings::Settings; + +use crate::frame::{self, Frame}; + +use bytes::Buf; + +use tokio::io::AsyncWrite; + +pub type PingPayload = [u8; 8]; + +pub type WindowSize = u32; + +// Constants +pub const MAX_WINDOW_SIZE: WindowSize = (1 << 31) - 1; +pub const DEFAULT_RESET_STREAM_MAX: usize = 10; +pub const DEFAULT_RESET_STREAM_SECS: u64 = 30; +pub const DEFAULT_MAX_SEND_BUFFER_SIZE: usize = 1024 * 400; diff --git a/third_party/rust/h2/src/proto/peer.rs b/third_party/rust/h2/src/proto/peer.rs new file mode 100644 index 0000000000..d62d9e24e0 --- /dev/null +++ b/third_party/rust/h2/src/proto/peer.rs @@ -0,0 +1,93 @@ +use crate::error::Reason; +use crate::frame::{Pseudo, StreamId}; +use crate::proto::{Error, Open}; + +use http::{HeaderMap, Request, Response}; + +use std::fmt; + +/// Either a Client or a Server +pub(crate) trait Peer { + /// Message type polled from the transport + type Poll: fmt::Debug; + const NAME: &'static str; + + fn r#dyn() -> Dyn; + + fn is_server() -> bool; + + fn convert_poll_message( + pseudo: Pseudo, + fields: HeaderMap, + stream_id: StreamId, + ) -> Result<Self::Poll, Error>; + + fn is_local_init(id: StreamId) -> bool { + assert!(!id.is_zero()); + Self::is_server() == id.is_server_initiated() + } +} + +/// A dynamic representation of `Peer`. +/// +/// This is used internally to avoid incurring a generic on all internal types. +#[derive(Debug, Copy, Clone, Eq, PartialEq)] +pub(crate) enum Dyn { + Client, + Server, +} + +#[derive(Debug)] +pub enum PollMessage { + Client(Response<()>), + Server(Request<()>), +} + +// ===== impl Dyn ===== + +impl Dyn { + pub fn is_server(&self) -> bool { + *self == Dyn::Server + } + + pub fn is_local_init(&self, id: StreamId) -> bool { + assert!(!id.is_zero()); + self.is_server() == id.is_server_initiated() + } + + pub fn convert_poll_message( + &self, + pseudo: Pseudo, + fields: HeaderMap, + stream_id: StreamId, + ) -> Result<PollMessage, Error> { + if self.is_server() { + crate::server::Peer::convert_poll_message(pseudo, fields, stream_id) + .map(PollMessage::Server) + } else { + crate::client::Peer::convert_poll_message(pseudo, fields, stream_id) + .map(PollMessage::Client) + } + } + + /// Returns true if the remote peer can initiate a stream with the given ID. + pub fn ensure_can_open(&self, id: StreamId, mode: Open) -> Result<(), Error> { + if self.is_server() { + // Ensure that the ID is a valid client initiated ID + if mode.is_push_promise() || !id.is_client_initiated() { + proto_err!(conn: "cannot open stream {:?} - not client initiated", id); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + + Ok(()) + } else { + // Ensure that the ID is a valid server initiated ID + if !mode.is_push_promise() || !id.is_server_initiated() { + proto_err!(conn: "cannot open stream {:?} - not server initiated", id); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + + Ok(()) + } + } +} diff --git a/third_party/rust/h2/src/proto/ping_pong.rs b/third_party/rust/h2/src/proto/ping_pong.rs new file mode 100644 index 0000000000..844c5fbb91 --- /dev/null +++ b/third_party/rust/h2/src/proto/ping_pong.rs @@ -0,0 +1,294 @@ +use crate::codec::Codec; +use crate::frame::Ping; +use crate::proto::{self, PingPayload}; + +use bytes::Buf; +use futures_util::task::AtomicWaker; +use std::io; +use std::sync::atomic::{AtomicUsize, Ordering}; +use std::sync::Arc; +use std::task::{Context, Poll}; +use tokio::io::AsyncWrite; + +/// Acknowledges ping requests from the remote. +#[derive(Debug)] +pub(crate) struct PingPong { + pending_ping: Option<PendingPing>, + pending_pong: Option<PingPayload>, + user_pings: Option<UserPingsRx>, +} + +#[derive(Debug)] +pub(crate) struct UserPings(Arc<UserPingsInner>); + +#[derive(Debug)] +struct UserPingsRx(Arc<UserPingsInner>); + +#[derive(Debug)] +struct UserPingsInner { + state: AtomicUsize, + /// Task to wake up the main `Connection`. + ping_task: AtomicWaker, + /// Task to wake up `share::PingPong::poll_pong`. + pong_task: AtomicWaker, +} + +#[derive(Debug)] +struct PendingPing { + payload: PingPayload, + sent: bool, +} + +/// Status returned from `PingPong::recv_ping`. +#[derive(Debug)] +pub(crate) enum ReceivedPing { + MustAck, + Unknown, + Shutdown, +} + +/// No user ping pending. +const USER_STATE_EMPTY: usize = 0; +/// User has called `send_ping`, but PING hasn't been written yet. +const USER_STATE_PENDING_PING: usize = 1; +/// User PING has been written, waiting for PONG. +const USER_STATE_PENDING_PONG: usize = 2; +/// We've received user PONG, waiting for user to `poll_pong`. +const USER_STATE_RECEIVED_PONG: usize = 3; +/// The connection is closed. +const USER_STATE_CLOSED: usize = 4; + +// ===== impl PingPong ===== + +impl PingPong { + pub(crate) fn new() -> Self { + PingPong { + pending_ping: None, + pending_pong: None, + user_pings: None, + } + } + + /// Can only be called once. If called a second time, returns `None`. + pub(crate) fn take_user_pings(&mut self) -> Option<UserPings> { + if self.user_pings.is_some() { + return None; + } + + let user_pings = Arc::new(UserPingsInner { + state: AtomicUsize::new(USER_STATE_EMPTY), + ping_task: AtomicWaker::new(), + pong_task: AtomicWaker::new(), + }); + self.user_pings = Some(UserPingsRx(user_pings.clone())); + Some(UserPings(user_pings)) + } + + pub(crate) fn ping_shutdown(&mut self) { + assert!(self.pending_ping.is_none()); + + self.pending_ping = Some(PendingPing { + payload: Ping::SHUTDOWN, + sent: false, + }); + } + + /// Process a ping + pub(crate) fn recv_ping(&mut self, ping: Ping) -> ReceivedPing { + // The caller should always check that `send_pongs` returns ready before + // calling `recv_ping`. + assert!(self.pending_pong.is_none()); + + if ping.is_ack() { + if let Some(pending) = self.pending_ping.take() { + if &pending.payload == ping.payload() { + assert_eq!( + &pending.payload, + &Ping::SHUTDOWN, + "pending_ping should be for shutdown", + ); + tracing::trace!("recv PING SHUTDOWN ack"); + return ReceivedPing::Shutdown; + } + + // if not the payload we expected, put it back. + self.pending_ping = Some(pending); + } + + if let Some(ref users) = self.user_pings { + if ping.payload() == &Ping::USER && users.receive_pong() { + tracing::trace!("recv PING USER ack"); + return ReceivedPing::Unknown; + } + } + + // else we were acked a ping we didn't send? + // The spec doesn't require us to do anything about this, + // so for resiliency, just ignore it for now. + tracing::warn!("recv PING ack that we never sent: {:?}", ping); + ReceivedPing::Unknown + } else { + // Save the ping's payload to be sent as an acknowledgement. + self.pending_pong = Some(ping.into_payload()); + ReceivedPing::MustAck + } + } + + /// Send any pending pongs. + pub(crate) fn send_pending_pong<T, B>( + &mut self, + cx: &mut Context, + dst: &mut Codec<T, B>, + ) -> Poll<io::Result<()>> + where + T: AsyncWrite + Unpin, + B: Buf, + { + if let Some(pong) = self.pending_pong.take() { + if !dst.poll_ready(cx)?.is_ready() { + self.pending_pong = Some(pong); + return Poll::Pending; + } + + dst.buffer(Ping::pong(pong).into()) + .expect("invalid pong frame"); + } + + Poll::Ready(Ok(())) + } + + /// Send any pending pings. + pub(crate) fn send_pending_ping<T, B>( + &mut self, + cx: &mut Context, + dst: &mut Codec<T, B>, + ) -> Poll<io::Result<()>> + where + T: AsyncWrite + Unpin, + B: Buf, + { + if let Some(ref mut ping) = self.pending_ping { + if !ping.sent { + if !dst.poll_ready(cx)?.is_ready() { + return Poll::Pending; + } + + dst.buffer(Ping::new(ping.payload).into()) + .expect("invalid ping frame"); + ping.sent = true; + } + } else if let Some(ref users) = self.user_pings { + if users.0.state.load(Ordering::Acquire) == USER_STATE_PENDING_PING { + if !dst.poll_ready(cx)?.is_ready() { + return Poll::Pending; + } + + dst.buffer(Ping::new(Ping::USER).into()) + .expect("invalid ping frame"); + users + .0 + .state + .store(USER_STATE_PENDING_PONG, Ordering::Release); + } else { + users.0.ping_task.register(cx.waker()); + } + } + + Poll::Ready(Ok(())) + } +} + +impl ReceivedPing { + pub(crate) fn is_shutdown(&self) -> bool { + match *self { + ReceivedPing::Shutdown => true, + _ => false, + } + } +} + +// ===== impl UserPings ===== + +impl UserPings { + pub(crate) fn send_ping(&self) -> Result<(), Option<proto::Error>> { + let prev = self + .0 + .state + .compare_exchange( + USER_STATE_EMPTY, // current + USER_STATE_PENDING_PING, // new + Ordering::AcqRel, + Ordering::Acquire, + ) + .unwrap_or_else(|v| v); + + match prev { + USER_STATE_EMPTY => { + self.0.ping_task.wake(); + Ok(()) + } + USER_STATE_CLOSED => Err(Some(broken_pipe().into())), + _ => { + // Was already pending, user error! + Err(None) + } + } + } + + pub(crate) fn poll_pong(&self, cx: &mut Context) -> Poll<Result<(), proto::Error>> { + // Must register before checking state, in case state were to change + // before we could register, and then the ping would just be lost. + self.0.pong_task.register(cx.waker()); + let prev = self + .0 + .state + .compare_exchange( + USER_STATE_RECEIVED_PONG, // current + USER_STATE_EMPTY, // new + Ordering::AcqRel, + Ordering::Acquire, + ) + .unwrap_or_else(|v| v); + + match prev { + USER_STATE_RECEIVED_PONG => Poll::Ready(Ok(())), + USER_STATE_CLOSED => Poll::Ready(Err(broken_pipe().into())), + _ => Poll::Pending, + } + } +} + +// ===== impl UserPingsRx ===== + +impl UserPingsRx { + fn receive_pong(&self) -> bool { + let prev = self + .0 + .state + .compare_exchange( + USER_STATE_PENDING_PONG, // current + USER_STATE_RECEIVED_PONG, // new + Ordering::AcqRel, + Ordering::Acquire, + ) + .unwrap_or_else(|v| v); + + if prev == USER_STATE_PENDING_PONG { + self.0.pong_task.wake(); + true + } else { + false + } + } +} + +impl Drop for UserPingsRx { + fn drop(&mut self) { + self.0.state.store(USER_STATE_CLOSED, Ordering::Release); + self.0.pong_task.wake(); + } +} + +fn broken_pipe() -> io::Error { + io::ErrorKind::BrokenPipe.into() +} diff --git a/third_party/rust/h2/src/proto/settings.rs b/third_party/rust/h2/src/proto/settings.rs new file mode 100644 index 0000000000..6cc6172099 --- /dev/null +++ b/third_party/rust/h2/src/proto/settings.rs @@ -0,0 +1,151 @@ +use crate::codec::UserError; +use crate::error::Reason; +use crate::frame; +use crate::proto::*; +use std::task::{Context, Poll}; + +#[derive(Debug)] +pub(crate) struct Settings { + /// Our local SETTINGS sync state with the remote. + local: Local, + /// Received SETTINGS frame pending processing. The ACK must be written to + /// the socket first then the settings applied **before** receiving any + /// further frames. + remote: Option<frame::Settings>, +} + +#[derive(Debug)] +enum Local { + /// We want to send these SETTINGS to the remote when the socket is ready. + ToSend(frame::Settings), + /// We have sent these SETTINGS and are waiting for the remote to ACK + /// before we apply them. + WaitingAck(frame::Settings), + /// Our local settings are in sync with the remote. + Synced, +} + +impl Settings { + pub(crate) fn new(local: frame::Settings) -> Self { + Settings { + // We assume the initial local SETTINGS were flushed during + // the handshake process. + local: Local::WaitingAck(local), + remote: None, + } + } + + pub(crate) fn recv_settings<T, B, C, P>( + &mut self, + frame: frame::Settings, + codec: &mut Codec<T, B>, + streams: &mut Streams<C, P>, + ) -> Result<(), Error> + where + T: AsyncWrite + Unpin, + B: Buf, + C: Buf, + P: Peer, + { + if frame.is_ack() { + match &self.local { + Local::WaitingAck(local) => { + tracing::debug!("received settings ACK; applying {:?}", local); + + if let Some(max) = local.max_frame_size() { + codec.set_max_recv_frame_size(max as usize); + } + + if let Some(max) = local.max_header_list_size() { + codec.set_max_recv_header_list_size(max as usize); + } + + streams.apply_local_settings(local)?; + self.local = Local::Synced; + Ok(()) + } + Local::ToSend(..) | Local::Synced => { + // We haven't sent any SETTINGS frames to be ACKed, so + // this is very bizarre! Remote is either buggy or malicious. + proto_err!(conn: "received unexpected settings ack"); + Err(Error::library_go_away(Reason::PROTOCOL_ERROR)) + } + } + } else { + // We always ACK before reading more frames, so `remote` should + // always be none! + assert!(self.remote.is_none()); + self.remote = Some(frame); + Ok(()) + } + } + + pub(crate) fn send_settings(&mut self, frame: frame::Settings) -> Result<(), UserError> { + assert!(!frame.is_ack()); + match &self.local { + Local::ToSend(..) | Local::WaitingAck(..) => Err(UserError::SendSettingsWhilePending), + Local::Synced => { + tracing::trace!("queue to send local settings: {:?}", frame); + self.local = Local::ToSend(frame); + Ok(()) + } + } + } + + pub(crate) fn poll_send<T, B, C, P>( + &mut self, + cx: &mut Context, + dst: &mut Codec<T, B>, + streams: &mut Streams<C, P>, + ) -> Poll<Result<(), Error>> + where + T: AsyncWrite + Unpin, + B: Buf, + C: Buf, + P: Peer, + { + if let Some(settings) = &self.remote { + if !dst.poll_ready(cx)?.is_ready() { + return Poll::Pending; + } + + // Create an ACK settings frame + let frame = frame::Settings::ack(); + + // Buffer the settings frame + dst.buffer(frame.into()).expect("invalid settings frame"); + + tracing::trace!("ACK sent; applying settings"); + + streams.apply_remote_settings(settings)?; + + if let Some(val) = settings.header_table_size() { + dst.set_send_header_table_size(val as usize); + } + + if let Some(val) = settings.max_frame_size() { + dst.set_max_send_frame_size(val as usize); + } + } + + self.remote = None; + + match &self.local { + Local::ToSend(settings) => { + if !dst.poll_ready(cx)?.is_ready() { + return Poll::Pending; + } + + // Buffer the settings frame + dst.buffer(settings.clone().into()) + .expect("invalid settings frame"); + tracing::trace!("local settings sent; waiting for ack: {:?}", settings); + + self.local = Local::WaitingAck(settings.clone()); + } + Local::WaitingAck(..) | Local::Synced => {} + } + + Poll::Ready(Ok(())) + } +} diff --git a/third_party/rust/h2/src/proto/streams/buffer.rs b/third_party/rust/h2/src/proto/streams/buffer.rs new file mode 100644 index 0000000000..2648a410e4 --- /dev/null +++ b/third_party/rust/h2/src/proto/streams/buffer.rs @@ -0,0 +1,95 @@ +use slab::Slab; + +/// Buffers frames for multiple streams. +#[derive(Debug)] +pub struct Buffer<T> { + slab: Slab<Slot<T>>, +} + +/// A sequence of frames in a `Buffer` +#[derive(Debug)] +pub struct Deque { + indices: Option<Indices>, +} + +/// Tracks the head & tail for a sequence of frames in a `Buffer`. +#[derive(Debug, Default, Copy, Clone)] +struct Indices { + head: usize, + tail: usize, +} + +#[derive(Debug)] +struct Slot<T> { + value: T, + next: Option<usize>, +} + +impl<T> Buffer<T> { + pub fn new() -> Self { + Buffer { slab: Slab::new() } + } +} + +impl Deque { + pub fn new() -> Self { + Deque { indices: None } + } + + pub fn is_empty(&self) -> bool { + self.indices.is_none() + } + + pub fn push_back<T>(&mut self, buf: &mut Buffer<T>, value: T) { + let key = buf.slab.insert(Slot { value, next: None }); + + match self.indices { + Some(ref mut idxs) => { + buf.slab[idxs.tail].next = Some(key); + idxs.tail = key; + } + None => { + self.indices = Some(Indices { + head: key, + tail: key, + }); + } + } + } + + pub fn push_front<T>(&mut self, buf: &mut Buffer<T>, value: T) { + let key = buf.slab.insert(Slot { value, next: None }); + + match self.indices { + Some(ref mut idxs) => { + buf.slab[key].next = Some(idxs.head); + idxs.head = key; + } + None => { + self.indices = Some(Indices { + head: key, + tail: key, + }); + } + } + } + + pub fn pop_front<T>(&mut self, buf: &mut Buffer<T>) -> Option<T> { + match self.indices { + Some(mut idxs) => { + let mut slot = buf.slab.remove(idxs.head); + + if idxs.head == idxs.tail { + assert!(slot.next.is_none()); + self.indices = None; + } else { + idxs.head = slot.next.take().unwrap(); + self.indices = Some(idxs); + } + + Some(slot.value) + } + None => None, + } + } +} diff --git a/third_party/rust/h2/src/proto/streams/counts.rs b/third_party/rust/h2/src/proto/streams/counts.rs new file mode 100644 index 0000000000..70dfc7851d --- /dev/null +++ b/third_party/rust/h2/src/proto/streams/counts.rs @@ -0,0 +1,210 @@ +use super::*; + +use std::usize; + +#[derive(Debug)] +pub(super) struct Counts { + /// Acting as a client or server. This allows us to track which values to + /// inc / dec. + peer: peer::Dyn, + + /// Maximum number of locally initiated streams + max_send_streams: usize, + + /// Current number of remote initiated streams + num_send_streams: usize, + + /// Maximum number of remote initiated streams + max_recv_streams: usize, + + /// Current number of locally initiated streams + num_recv_streams: usize, + + /// Maximum number of pending locally reset streams + max_reset_streams: usize, + + /// Current number of pending locally reset streams + num_reset_streams: usize, +} + +impl Counts { + /// Create a new `Counts` using the provided configuration values. + pub fn new(peer: peer::Dyn, config: &Config) -> Self { + Counts { + peer, + max_send_streams: config.initial_max_send_streams, + num_send_streams: 0, + max_recv_streams: config.remote_max_initiated.unwrap_or(usize::MAX), + num_recv_streams: 0, + max_reset_streams: config.local_reset_max, + num_reset_streams: 0, + } + } + + /// Returns the current peer + pub fn peer(&self) -> peer::Dyn { + self.peer + } + + pub fn has_streams(&self) -> bool { + self.num_send_streams != 0 || self.num_recv_streams != 0 + } + + /// Returns true if the receive stream concurrency can be incremented + pub fn can_inc_num_recv_streams(&self) -> bool { + self.max_recv_streams > self.num_recv_streams + } + + /// Increments the number of concurrent receive streams. + /// + /// # Panics + /// + /// Panics on failure as this should have been validated before hand. + pub fn inc_num_recv_streams(&mut self, stream: &mut store::Ptr) { + assert!(self.can_inc_num_recv_streams()); + assert!(!stream.is_counted); + + // Increment the number of remote initiated streams + self.num_recv_streams += 1; + stream.is_counted = true; + } + + /// Returns true if the send stream concurrency can be incremented + pub fn can_inc_num_send_streams(&self) -> bool { + self.max_send_streams > self.num_send_streams + } + + /// Increments the number of concurrent send streams. + /// + /// # Panics + /// + /// Panics on failure as this should have been validated before hand. + pub fn inc_num_send_streams(&mut self, stream: &mut store::Ptr) { + assert!(self.can_inc_num_send_streams()); + assert!(!stream.is_counted); + + // Increment the number of remote initiated streams + self.num_send_streams += 1; + stream.is_counted = true; + } + + /// Returns true if the number of pending reset streams can be incremented. + pub fn can_inc_num_reset_streams(&self) -> bool { + self.max_reset_streams > self.num_reset_streams + } + + /// Increments the number of pending reset streams. + /// + /// # Panics + /// + /// Panics on failure as this should have been validated before hand. + pub fn inc_num_reset_streams(&mut self) { + assert!(self.can_inc_num_reset_streams()); + + self.num_reset_streams += 1; + } + + pub fn apply_remote_settings(&mut self, settings: &frame::Settings) { + if let Some(val) = settings.max_concurrent_streams() { + self.max_send_streams = val as usize; + } + } + + /// Run a block of code that could potentially transition a stream's state. + /// + /// If the stream state transitions to closed, this function will perform + /// all necessary cleanup. + /// + /// TODO: Is this function still needed? + pub fn transition<F, U>(&mut self, mut stream: store::Ptr, f: F) -> U + where + F: FnOnce(&mut Self, &mut store::Ptr) -> U, + { + // TODO: Does this need to be computed before performing the action? + let is_pending_reset = stream.is_pending_reset_expiration(); + + // Run the action + let ret = f(self, &mut stream); + + self.transition_after(stream, is_pending_reset); + + ret + } + + // TODO: move this to macro? + pub fn transition_after(&mut self, mut stream: store::Ptr, is_reset_counted: bool) { + tracing::trace!( + "transition_after; stream={:?}; state={:?}; is_closed={:?}; \ + pending_send_empty={:?}; buffered_send_data={}; \ + num_recv={}; num_send={}", + stream.id, + stream.state, + stream.is_closed(), + stream.pending_send.is_empty(), + stream.buffered_send_data, + self.num_recv_streams, + self.num_send_streams + ); + + if stream.is_closed() { + if !stream.is_pending_reset_expiration() { + stream.unlink(); + if is_reset_counted { + self.dec_num_reset_streams(); + } + } + + if stream.is_counted { + tracing::trace!("dec_num_streams; stream={:?}", stream.id); + // Decrement the number of active streams. + self.dec_num_streams(&mut stream); + } + } + + // Release the stream if it requires releasing + if stream.is_released() { + stream.remove(); + } + } + + /// Returns the maximum number of streams that can be initiated by this + /// peer. + pub(crate) fn max_send_streams(&self) -> usize { + self.max_send_streams + } + + /// Returns the maximum number of streams that can be initiated by the + /// remote peer. + pub(crate) fn max_recv_streams(&self) -> usize { + self.max_recv_streams + } + + fn dec_num_streams(&mut self, stream: &mut store::Ptr) { + assert!(stream.is_counted); + + if self.peer.is_local_init(stream.id) { + assert!(self.num_send_streams > 0); + self.num_send_streams -= 1; + stream.is_counted = false; + } else { + assert!(self.num_recv_streams > 0); + self.num_recv_streams -= 1; + stream.is_counted = false; + } + } + + fn dec_num_reset_streams(&mut self) { + assert!(self.num_reset_streams > 0); + self.num_reset_streams -= 1; + } +} + +impl Drop for Counts { + fn drop(&mut self) { + use std::thread; + + if !thread::panicking() { + debug_assert!(!self.has_streams()); + } + } +} diff --git a/third_party/rust/h2/src/proto/streams/flow_control.rs b/third_party/rust/h2/src/proto/streams/flow_control.rs new file mode 100644 index 0000000000..4a47f08ddf --- /dev/null +++ b/third_party/rust/h2/src/proto/streams/flow_control.rs @@ -0,0 +1,258 @@ +use crate::frame::Reason; +use crate::proto::{WindowSize, MAX_WINDOW_SIZE}; + +use std::fmt; + +// We don't want to send WINDOW_UPDATE frames for tiny changes, but instead +// aggregate them when the changes are significant. Many implementations do +// this by keeping a "ratio" of the update version the allowed window size. +// +// While some may wish to represent this ratio as percentage, using a f32, +// we skip having to deal with float math and stick to integers. To do so, +// the "ratio" is represented by 2 i32s, split into the numerator and +// denominator. For example, a 50% ratio is simply represented as 1/2. +// +// An example applying this ratio: If a stream has an allowed window size of +// 100 bytes, WINDOW_UPDATE frames are scheduled when the unclaimed change +// becomes greater than 1/2, or 50 bytes. +const UNCLAIMED_NUMERATOR: i32 = 1; +const UNCLAIMED_DENOMINATOR: i32 = 2; + +#[test] +fn sanity_unclaimed_ratio() { + assert!(UNCLAIMED_NUMERATOR < UNCLAIMED_DENOMINATOR); + assert!(UNCLAIMED_NUMERATOR >= 0); + assert!(UNCLAIMED_DENOMINATOR > 0); +} + +#[derive(Copy, Clone, Debug)] +pub struct FlowControl { + /// Window the peer knows about. + /// + /// This can go negative if a SETTINGS_INITIAL_WINDOW_SIZE is received. + /// + /// For example, say the peer sends a request and uses 32kb of the window. + /// We send a SETTINGS_INITIAL_WINDOW_SIZE of 16kb. The peer has to adjust + /// its understanding of the capacity of the window, and that would be: + /// + /// ```notrust + /// default (64kb) - used (32kb) - settings_diff (64kb - 16kb): -16kb + /// ``` + window_size: Window, + + /// Window that we know about. + /// + /// This can go negative if a user declares a smaller target window than + /// the peer knows about. + available: Window, +} + +impl FlowControl { + pub fn new() -> FlowControl { + FlowControl { + window_size: Window(0), + available: Window(0), + } + } + + /// Returns the window size as known by the peer + pub fn window_size(&self) -> WindowSize { + self.window_size.as_size() + } + + /// Returns the window size available to the consumer + pub fn available(&self) -> Window { + self.available + } + + /// Returns true if there is unavailable window capacity + pub fn has_unavailable(&self) -> bool { + if self.window_size < 0 { + return false; + } + + self.window_size > self.available + } + + pub fn claim_capacity(&mut self, capacity: WindowSize) { + self.available -= capacity; + } + + pub fn assign_capacity(&mut self, capacity: WindowSize) { + self.available += capacity; + } + + /// If a WINDOW_UPDATE frame should be sent, returns a positive number + /// representing the increment to be used. + /// + /// If there is no available bytes to be reclaimed, or the number of + /// available bytes does not reach the threshold, this returns `None`. + /// + /// This represents pending outbound WINDOW_UPDATE frames. + pub fn unclaimed_capacity(&self) -> Option<WindowSize> { + let available = self.available; + + if self.window_size >= available { + return None; + } + + let unclaimed = available.0 - self.window_size.0; + let threshold = self.window_size.0 / UNCLAIMED_DENOMINATOR * UNCLAIMED_NUMERATOR; + + if unclaimed < threshold { + None + } else { + Some(unclaimed as WindowSize) + } + } + + /// Increase the window size. + /// + /// This is called after receiving a WINDOW_UPDATE frame + pub fn inc_window(&mut self, sz: WindowSize) -> Result<(), Reason> { + let (val, overflow) = self.window_size.0.overflowing_add(sz as i32); + + if overflow { + return Err(Reason::FLOW_CONTROL_ERROR); + } + + if val > MAX_WINDOW_SIZE as i32 { + return Err(Reason::FLOW_CONTROL_ERROR); + } + + tracing::trace!( + "inc_window; sz={}; old={}; new={}", + sz, + self.window_size, + val + ); + + self.window_size = Window(val); + Ok(()) + } + + /// Decrement the send-side window size. + /// + /// This is called after receiving a SETTINGS frame with a lower + /// INITIAL_WINDOW_SIZE value. + pub fn dec_send_window(&mut self, sz: WindowSize) { + tracing::trace!( + "dec_window; sz={}; window={}, available={}", + sz, + self.window_size, + self.available + ); + // This should not be able to overflow `window_size` from the bottom. + self.window_size -= sz; + } + + /// Decrement the recv-side window size. + /// + /// This is called after receiving a SETTINGS ACK frame with a lower + /// INITIAL_WINDOW_SIZE value. + pub fn dec_recv_window(&mut self, sz: WindowSize) { + tracing::trace!( + "dec_recv_window; sz={}; window={}, available={}", + sz, + self.window_size, + self.available + ); + // This should not be able to overflow `window_size` from the bottom. + self.window_size -= sz; + self.available -= sz; + } + + /// Decrements the window reflecting data has actually been sent. The caller + /// must ensure that the window has capacity. + pub fn send_data(&mut self, sz: WindowSize) { + tracing::trace!( + "send_data; sz={}; window={}; available={}", + sz, + self.window_size, + self.available + ); + + // Ensure that the argument is correct + assert!(self.window_size >= sz as usize); + + // Update values + self.window_size -= sz; + self.available -= sz; + } +} + +/// The current capacity of a flow-controlled Window. +/// +/// This number can go negative when either side has used a certain amount +/// of capacity when the other side advertises a reduction in size. +/// +/// This type tries to centralize the knowledge of addition and subtraction +/// to this capacity, instead of having integer casts throughout the source. +#[derive(Clone, Copy, Debug, PartialEq, PartialOrd)] +pub struct Window(i32); + +impl Window { + pub fn as_size(&self) -> WindowSize { + if self.0 < 0 { + 0 + } else { + self.0 as WindowSize + } + } + + pub fn checked_size(&self) -> WindowSize { + assert!(self.0 >= 0, "negative Window"); + self.0 as WindowSize + } +} + +impl PartialEq<usize> for Window { + fn eq(&self, other: &usize) -> bool { + if self.0 < 0 { + false + } else { + (self.0 as usize).eq(other) + } + } +} + +impl PartialOrd<usize> for Window { + fn partial_cmp(&self, other: &usize) -> Option<::std::cmp::Ordering> { + if self.0 < 0 { + Some(::std::cmp::Ordering::Less) + } else { + (self.0 as usize).partial_cmp(other) + } + } +} + +impl ::std::ops::SubAssign<WindowSize> for Window { + fn sub_assign(&mut self, other: WindowSize) { + self.0 -= other as i32; + } +} + +impl ::std::ops::Add<WindowSize> for Window { + type Output = Self; + fn add(self, other: WindowSize) -> Self::Output { + Window(self.0 + other as i32) + } +} + +impl ::std::ops::AddAssign<WindowSize> for Window { + fn add_assign(&mut self, other: WindowSize) { + self.0 += other as i32; + } +} + +impl fmt::Display for Window { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + fmt::Display::fmt(&self.0, f) + } +} + +impl From<Window> for isize { + fn from(w: Window) -> isize { + w.0 as isize + } +} diff --git a/third_party/rust/h2/src/proto/streams/mod.rs b/third_party/rust/h2/src/proto/streams/mod.rs new file mode 100644 index 0000000000..de2a2c85a0 --- /dev/null +++ b/third_party/rust/h2/src/proto/streams/mod.rs @@ -0,0 +1,67 @@ +mod buffer; +mod counts; +mod flow_control; +mod prioritize; +mod recv; +mod send; +mod state; +mod store; +mod stream; +mod streams; + +pub(crate) use self::prioritize::Prioritized; +pub(crate) use self::recv::Open; +pub(crate) use self::send::PollReset; +pub(crate) use self::streams::{DynStreams, OpaqueStreamRef, StreamRef, Streams}; + +use self::buffer::Buffer; +use self::counts::Counts; +use self::flow_control::FlowControl; +use self::prioritize::Prioritize; +use self::recv::Recv; +use self::send::Send; +use self::state::State; +use self::store::Store; +use self::stream::Stream; + +use crate::frame::{StreamId, StreamIdOverflow}; +use crate::proto::*; + +use bytes::Bytes; +use std::time::Duration; + +#[derive(Debug)] +pub struct Config { + /// Initial window size of locally initiated streams + pub local_init_window_sz: WindowSize, + + /// Initial maximum number of locally initiated streams. + /// After receiving a Settings frame from the remote peer, + /// the connection will overwrite this value with the + /// MAX_CONCURRENT_STREAMS specified in the frame. + pub initial_max_send_streams: usize, + + /// Max amount of DATA bytes to buffer per stream. + pub local_max_buffer_size: usize, + + /// The stream ID to start the next local stream with + pub local_next_stream_id: StreamId, + + /// If the local peer is willing to receive push promises + pub local_push_enabled: bool, + + /// If extended connect protocol is enabled. + pub extended_connect_protocol_enabled: bool, + + /// How long a locally reset stream should ignore frames + pub local_reset_duration: Duration, + + /// Maximum number of locally reset streams to keep at a time + pub local_reset_max: usize, + + /// Initial window size of remote initiated streams + pub remote_init_window_sz: WindowSize, + + /// Maximum number of remote initiated streams + pub remote_max_initiated: Option<usize>, +} diff --git a/third_party/rust/h2/src/proto/streams/prioritize.rs b/third_party/rust/h2/src/proto/streams/prioritize.rs new file mode 100644 index 0000000000..c2904aca9b --- /dev/null +++ b/third_party/rust/h2/src/proto/streams/prioritize.rs @@ -0,0 +1,903 @@ +use super::store::Resolve; +use super::*; + +use crate::frame::{Reason, StreamId}; + +use crate::codec::UserError; +use crate::codec::UserError::*; + +use bytes::buf::{Buf, Take}; +use std::io; +use std::task::{Context, Poll, Waker}; +use std::{cmp, fmt, mem}; + +/// # Warning +/// +/// Queued streams are ordered by stream ID, as we need to ensure that +/// lower-numbered streams are sent headers before higher-numbered ones. +/// This is because "idle" stream IDs – those which have been initiated but +/// have yet to receive frames – will be implicitly closed on receipt of a +/// frame on a higher stream ID. If these queues was not ordered by stream +/// IDs, some mechanism would be necessary to ensure that the lowest-numbered] +/// idle stream is opened first. +#[derive(Debug)] +pub(super) struct Prioritize { + /// Queue of streams waiting for socket capacity to send a frame. + pending_send: store::Queue<stream::NextSend>, + + /// Queue of streams waiting for window capacity to produce data. + pending_capacity: store::Queue<stream::NextSendCapacity>, + + /// Streams waiting for capacity due to max concurrency + /// + /// The `SendRequest` handle is `Clone`. This enables initiating requests + /// from many tasks. However, offering this capability while supporting + /// backpressure at some level is tricky. If there are many `SendRequest` + /// handles and a single stream becomes available, which handle gets + /// assigned that stream? Maybe that handle is no longer ready to send a + /// request. + /// + /// The strategy used is to allow each `SendRequest` handle one buffered + /// request. A `SendRequest` handle is ready to send a request if it has no + /// associated buffered requests. This is the same strategy as `mpsc` in the + /// futures library. + pending_open: store::Queue<stream::NextOpen>, + + /// Connection level flow control governing sent data + flow: FlowControl, + + /// Stream ID of the last stream opened. + last_opened_id: StreamId, + + /// What `DATA` frame is currently being sent in the codec. + in_flight_data_frame: InFlightData, + + /// The maximum amount of bytes a stream should buffer. + max_buffer_size: usize, +} + +#[derive(Debug, Eq, PartialEq)] +enum InFlightData { + /// There is no `DATA` frame in flight. + Nothing, + /// There is a `DATA` frame in flight belonging to the given stream. + DataFrame(store::Key), + /// There was a `DATA` frame, but the stream's queue was since cleared. + Drop, +} + +pub(crate) struct Prioritized<B> { + // The buffer + inner: Take<B>, + + end_of_stream: bool, + + // The stream that this is associated with + stream: store::Key, +} + +// ===== impl Prioritize ===== + +impl Prioritize { + pub fn new(config: &Config) -> Prioritize { + let mut flow = FlowControl::new(); + + flow.inc_window(config.remote_init_window_sz) + .expect("invalid initial window size"); + + flow.assign_capacity(config.remote_init_window_sz); + + tracing::trace!("Prioritize::new; flow={:?}", flow); + + Prioritize { + pending_send: store::Queue::new(), + pending_capacity: store::Queue::new(), + pending_open: store::Queue::new(), + flow, + last_opened_id: StreamId::ZERO, + in_flight_data_frame: InFlightData::Nothing, + max_buffer_size: config.local_max_buffer_size, + } + } + + pub(crate) fn max_buffer_size(&self) -> usize { + self.max_buffer_size + } + + /// Queue a frame to be sent to the remote + pub fn queue_frame<B>( + &mut self, + frame: Frame<B>, + buffer: &mut Buffer<Frame<B>>, + stream: &mut store::Ptr, + task: &mut Option<Waker>, + ) { + let span = tracing::trace_span!("Prioritize::queue_frame", ?stream.id); + let _e = span.enter(); + // Queue the frame in the buffer + stream.pending_send.push_back(buffer, frame); + self.schedule_send(stream, task); + } + + pub fn schedule_send(&mut self, stream: &mut store::Ptr, task: &mut Option<Waker>) { + // If the stream is waiting to be opened, nothing more to do. + if stream.is_send_ready() { + tracing::trace!(?stream.id, "schedule_send"); + // Queue the stream + self.pending_send.push(stream); + + // Notify the connection. + if let Some(task) = task.take() { + task.wake(); + } + } + } + + pub fn queue_open(&mut self, stream: &mut store::Ptr) { + self.pending_open.push(stream); + } + + /// Send a data frame + pub fn send_data<B>( + &mut self, + frame: frame::Data<B>, + buffer: &mut Buffer<Frame<B>>, + stream: &mut store::Ptr, + counts: &mut Counts, + task: &mut Option<Waker>, + ) -> Result<(), UserError> + where + B: Buf, + { + let sz = frame.payload().remaining(); + + if sz > MAX_WINDOW_SIZE as usize { + return Err(UserError::PayloadTooBig); + } + + let sz = sz as WindowSize; + + if !stream.state.is_send_streaming() { + if stream.state.is_closed() { + return Err(InactiveStreamId); + } else { + return Err(UnexpectedFrameType); + } + } + + // Update the buffered data counter + stream.buffered_send_data += sz as usize; + + let span = + tracing::trace_span!("send_data", sz, requested = stream.requested_send_capacity); + let _e = span.enter(); + tracing::trace!(buffered = stream.buffered_send_data); + + // Implicitly request more send capacity if not enough has been + // requested yet. + if (stream.requested_send_capacity as usize) < stream.buffered_send_data { + // Update the target requested capacity + stream.requested_send_capacity = + cmp::min(stream.buffered_send_data, WindowSize::MAX as usize) as WindowSize; + + self.try_assign_capacity(stream); + } + + if frame.is_end_stream() { + stream.state.send_close(); + self.reserve_capacity(0, stream, counts); + } + + tracing::trace!( + available = %stream.send_flow.available(), + buffered = stream.buffered_send_data, + ); + + // The `stream.buffered_send_data == 0` check is here so that, if a zero + // length data frame is queued to the front (there is no previously + // queued data), it gets sent out immediately even if there is no + // available send window. + // + // Sending out zero length data frames can be done to signal + // end-of-stream. + // + if stream.send_flow.available() > 0 || stream.buffered_send_data == 0 { + // The stream currently has capacity to send the data frame, so + // queue it up and notify the connection task. + self.queue_frame(frame.into(), buffer, stream, task); + } else { + // The stream has no capacity to send the frame now, save it but + // don't notify the connection task. Once additional capacity + // becomes available, the frame will be flushed. + stream.pending_send.push_back(buffer, frame.into()); + } + + Ok(()) + } + + /// Request capacity to send data + pub fn reserve_capacity( + &mut self, + capacity: WindowSize, + stream: &mut store::Ptr, + counts: &mut Counts, + ) { + let span = tracing::trace_span!( + "reserve_capacity", + ?stream.id, + requested = capacity, + effective = (capacity as usize) + stream.buffered_send_data, + curr = stream.requested_send_capacity + ); + let _e = span.enter(); + + // Actual capacity is `capacity` + the current amount of buffered data. + // If it were less, then we could never send out the buffered data. + let capacity = (capacity as usize) + stream.buffered_send_data; + + if capacity == stream.requested_send_capacity as usize { + // Nothing to do + } else if capacity < stream.requested_send_capacity as usize { + // Update the target requested capacity + stream.requested_send_capacity = capacity as WindowSize; + + // Currently available capacity assigned to the stream + let available = stream.send_flow.available().as_size(); + + // If the stream has more assigned capacity than requested, reclaim + // some for the connection + if available as usize > capacity { + let diff = available - capacity as WindowSize; + + stream.send_flow.claim_capacity(diff); + + self.assign_connection_capacity(diff, stream, counts); + } + } else { + // If trying to *add* capacity, but the stream send side is closed, + // there's nothing to be done. + if stream.state.is_send_closed() { + return; + } + + // Update the target requested capacity + stream.requested_send_capacity = + cmp::min(capacity, WindowSize::MAX as usize) as WindowSize; + + // Try to assign additional capacity to the stream. If none is + // currently available, the stream will be queued to receive some + // when more becomes available. + self.try_assign_capacity(stream); + } + } + + pub fn recv_stream_window_update( + &mut self, + inc: WindowSize, + stream: &mut store::Ptr, + ) -> Result<(), Reason> { + let span = tracing::trace_span!( + "recv_stream_window_update", + ?stream.id, + ?stream.state, + inc, + flow = ?stream.send_flow + ); + let _e = span.enter(); + + if stream.state.is_send_closed() && stream.buffered_send_data == 0 { + // We can't send any data, so don't bother doing anything else. + return Ok(()); + } + + // Update the stream level flow control. + stream.send_flow.inc_window(inc)?; + + // If the stream is waiting on additional capacity, then this will + // assign it (if available on the connection) and notify the producer + self.try_assign_capacity(stream); + + Ok(()) + } + + pub fn recv_connection_window_update( + &mut self, + inc: WindowSize, + store: &mut Store, + counts: &mut Counts, + ) -> Result<(), Reason> { + // Update the connection's window + self.flow.inc_window(inc)?; + + self.assign_connection_capacity(inc, store, counts); + Ok(()) + } + + /// Reclaim all capacity assigned to the stream and re-assign it to the + /// connection + pub fn reclaim_all_capacity(&mut self, stream: &mut store::Ptr, counts: &mut Counts) { + let available = stream.send_flow.available().as_size(); + stream.send_flow.claim_capacity(available); + // Re-assign all capacity to the connection + self.assign_connection_capacity(available, stream, counts); + } + + /// Reclaim just reserved capacity, not buffered capacity, and re-assign + /// it to the connection + pub fn reclaim_reserved_capacity(&mut self, stream: &mut store::Ptr, counts: &mut Counts) { + // only reclaim requested capacity that isn't already buffered + if stream.requested_send_capacity as usize > stream.buffered_send_data { + let reserved = stream.requested_send_capacity - stream.buffered_send_data as WindowSize; + + stream.send_flow.claim_capacity(reserved); + self.assign_connection_capacity(reserved, stream, counts); + } + } + + pub fn clear_pending_capacity(&mut self, store: &mut Store, counts: &mut Counts) { + let span = tracing::trace_span!("clear_pending_capacity"); + let _e = span.enter(); + while let Some(stream) = self.pending_capacity.pop(store) { + counts.transition(stream, |_, stream| { + tracing::trace!(?stream.id, "clear_pending_capacity"); + }) + } + } + + pub fn assign_connection_capacity<R>( + &mut self, + inc: WindowSize, + store: &mut R, + counts: &mut Counts, + ) where + R: Resolve, + { + let span = tracing::trace_span!("assign_connection_capacity", inc); + let _e = span.enter(); + + self.flow.assign_capacity(inc); + + // Assign newly acquired capacity to streams pending capacity. + while self.flow.available() > 0 { + let stream = match self.pending_capacity.pop(store) { + Some(stream) => stream, + None => return, + }; + + // Streams pending capacity may have been reset before capacity + // became available. In that case, the stream won't want any + // capacity, and so we shouldn't "transition" on it, but just evict + // it and continue the loop. + if !(stream.state.is_send_streaming() || stream.buffered_send_data > 0) { + continue; + } + + counts.transition(stream, |_, mut stream| { + // Try to assign capacity to the stream. This will also re-queue the + // stream if there isn't enough connection level capacity to fulfill + // the capacity request. + self.try_assign_capacity(&mut stream); + }) + } + } + + /// Request capacity to send data + fn try_assign_capacity(&mut self, stream: &mut store::Ptr) { + let total_requested = stream.requested_send_capacity; + + // Total requested should never go below actual assigned + // (Note: the window size can go lower than assigned) + debug_assert!(stream.send_flow.available() <= total_requested as usize); + + // The amount of additional capacity that the stream requests. + // Don't assign more than the window has available! + let additional = cmp::min( + total_requested - stream.send_flow.available().as_size(), + // Can't assign more than what is available + stream.send_flow.window_size() - stream.send_flow.available().as_size(), + ); + let span = tracing::trace_span!("try_assign_capacity", ?stream.id); + let _e = span.enter(); + tracing::trace!( + requested = total_requested, + additional, + buffered = stream.buffered_send_data, + window = stream.send_flow.window_size(), + conn = %self.flow.available() + ); + + if additional == 0 { + // Nothing more to do + return; + } + + // If the stream has requested capacity, then it must be in the + // streaming state (more data could be sent) or there is buffered data + // waiting to be sent. + debug_assert!( + stream.state.is_send_streaming() || stream.buffered_send_data > 0, + "state={:?}", + stream.state + ); + + // The amount of currently available capacity on the connection + let conn_available = self.flow.available().as_size(); + + // First check if capacity is immediately available + if conn_available > 0 { + // The amount of capacity to assign to the stream + // TODO: Should prioritization factor into this? + let assign = cmp::min(conn_available, additional); + + tracing::trace!(capacity = assign, "assigning"); + + // Assign the capacity to the stream + stream.assign_capacity(assign, self.max_buffer_size); + + // Claim the capacity from the connection + self.flow.claim_capacity(assign); + } + + tracing::trace!( + available = %stream.send_flow.available(), + requested = stream.requested_send_capacity, + buffered = stream.buffered_send_data, + has_unavailable = %stream.send_flow.has_unavailable() + ); + + if stream.send_flow.available() < stream.requested_send_capacity as usize + && stream.send_flow.has_unavailable() + { + // The stream requires additional capacity and the stream's + // window has available capacity, but the connection window + // does not. + // + // In this case, the stream needs to be queued up for when the + // connection has more capacity. + self.pending_capacity.push(stream); + } + + // If data is buffered and the stream is send ready, then + // schedule the stream for execution + if stream.buffered_send_data > 0 && stream.is_send_ready() { + // TODO: This assertion isn't *exactly* correct. There can still be + // buffered send data while the stream's pending send queue is + // empty. This can happen when a large data frame is in the process + // of being **partially** sent. Once the window has been sent, the + // data frame will be returned to the prioritization layer to be + // re-scheduled. + // + // That said, it would be nice to figure out how to make this + // assertion correctly. + // + // debug_assert!(!stream.pending_send.is_empty()); + + self.pending_send.push(stream); + } + } + + pub fn poll_complete<T, B>( + &mut self, + cx: &mut Context, + buffer: &mut Buffer<Frame<B>>, + store: &mut Store, + counts: &mut Counts, + dst: &mut Codec<T, Prioritized<B>>, + ) -> Poll<io::Result<()>> + where + T: AsyncWrite + Unpin, + B: Buf, + { + // Ensure codec is ready + ready!(dst.poll_ready(cx))?; + + // Reclaim any frame that has previously been written + self.reclaim_frame(buffer, store, dst); + + // The max frame length + let max_frame_len = dst.max_send_frame_size(); + + tracing::trace!("poll_complete"); + + loop { + self.schedule_pending_open(store, counts); + + match self.pop_frame(buffer, store, max_frame_len, counts) { + Some(frame) => { + tracing::trace!(?frame, "writing"); + + debug_assert_eq!(self.in_flight_data_frame, InFlightData::Nothing); + if let Frame::Data(ref frame) = frame { + self.in_flight_data_frame = InFlightData::DataFrame(frame.payload().stream); + } + dst.buffer(frame).expect("invalid frame"); + + // Ensure the codec is ready to try the loop again. + ready!(dst.poll_ready(cx))?; + + // Because, always try to reclaim... + self.reclaim_frame(buffer, store, dst); + } + None => { + // Try to flush the codec. + ready!(dst.flush(cx))?; + + // This might release a data frame... + if !self.reclaim_frame(buffer, store, dst) { + return Poll::Ready(Ok(())); + } + + // No need to poll ready as poll_complete() does this for + // us... + } + } + } + } + + /// Tries to reclaim a pending data frame from the codec. + /// + /// Returns true if a frame was reclaimed. + /// + /// When a data frame is written to the codec, it may not be written in its + /// entirety (large chunks are split up into potentially many data frames). + /// In this case, the stream needs to be reprioritized. + fn reclaim_frame<T, B>( + &mut self, + buffer: &mut Buffer<Frame<B>>, + store: &mut Store, + dst: &mut Codec<T, Prioritized<B>>, + ) -> bool + where + B: Buf, + { + let span = tracing::trace_span!("try_reclaim_frame"); + let _e = span.enter(); + + // First check if there are any data chunks to take back + if let Some(frame) = dst.take_last_data_frame() { + self.reclaim_frame_inner(buffer, store, frame) + } else { + false + } + } + + fn reclaim_frame_inner<B>( + &mut self, + buffer: &mut Buffer<Frame<B>>, + store: &mut Store, + frame: frame::Data<Prioritized<B>>, + ) -> bool + where + B: Buf, + { + tracing::trace!( + ?frame, + sz = frame.payload().inner.get_ref().remaining(), + "reclaimed" + ); + + let mut eos = false; + let key = frame.payload().stream; + + match mem::replace(&mut self.in_flight_data_frame, InFlightData::Nothing) { + InFlightData::Nothing => panic!("wasn't expecting a frame to reclaim"), + InFlightData::Drop => { + tracing::trace!("not reclaiming frame for cancelled stream"); + return false; + } + InFlightData::DataFrame(k) => { + debug_assert_eq!(k, key); + } + } + + let mut frame = frame.map(|prioritized| { + // TODO: Ensure fully written + eos = prioritized.end_of_stream; + prioritized.inner.into_inner() + }); + + if frame.payload().has_remaining() { + let mut stream = store.resolve(key); + + if eos { + frame.set_end_stream(true); + } + + self.push_back_frame(frame.into(), buffer, &mut stream); + + return true; + } + + false + } + + /// Push the frame to the front of the stream's deque, scheduling the + /// stream if needed. + fn push_back_frame<B>( + &mut self, + frame: Frame<B>, + buffer: &mut Buffer<Frame<B>>, + stream: &mut store::Ptr, + ) { + // Push the frame to the front of the stream's deque + stream.pending_send.push_front(buffer, frame); + + // If needed, schedule the sender + if stream.send_flow.available() > 0 { + debug_assert!(!stream.pending_send.is_empty()); + self.pending_send.push(stream); + } + } + + pub fn clear_queue<B>(&mut self, buffer: &mut Buffer<Frame<B>>, stream: &mut store::Ptr) { + let span = tracing::trace_span!("clear_queue", ?stream.id); + let _e = span.enter(); + + // TODO: make this more efficient? + while let Some(frame) = stream.pending_send.pop_front(buffer) { + tracing::trace!(?frame, "dropping"); + } + + stream.buffered_send_data = 0; + stream.requested_send_capacity = 0; + if let InFlightData::DataFrame(key) = self.in_flight_data_frame { + if stream.key() == key { + // This stream could get cleaned up now - don't allow the buffered frame to get reclaimed. + self.in_flight_data_frame = InFlightData::Drop; + } + } + } + + pub fn clear_pending_send(&mut self, store: &mut Store, counts: &mut Counts) { + while let Some(stream) = self.pending_send.pop(store) { + let is_pending_reset = stream.is_pending_reset_expiration(); + counts.transition_after(stream, is_pending_reset); + } + } + + pub fn clear_pending_open(&mut self, store: &mut Store, counts: &mut Counts) { + while let Some(stream) = self.pending_open.pop(store) { + let is_pending_reset = stream.is_pending_reset_expiration(); + counts.transition_after(stream, is_pending_reset); + } + } + + fn pop_frame<B>( + &mut self, + buffer: &mut Buffer<Frame<B>>, + store: &mut Store, + max_len: usize, + counts: &mut Counts, + ) -> Option<Frame<Prioritized<B>>> + where + B: Buf, + { + let span = tracing::trace_span!("pop_frame"); + let _e = span.enter(); + + loop { + match self.pending_send.pop(store) { + Some(mut stream) => { + let span = tracing::trace_span!("popped", ?stream.id, ?stream.state); + let _e = span.enter(); + + // It's possible that this stream, besides having data to send, + // is also queued to send a reset, and thus is already in the queue + // to wait for "some time" after a reset. + // + // To be safe, we just always ask the stream. + let is_pending_reset = stream.is_pending_reset_expiration(); + + tracing::trace!(is_pending_reset); + + let frame = match stream.pending_send.pop_front(buffer) { + Some(Frame::Data(mut frame)) => { + // Get the amount of capacity remaining for stream's + // window. + let stream_capacity = stream.send_flow.available(); + let sz = frame.payload().remaining(); + + tracing::trace!( + sz, + eos = frame.is_end_stream(), + window = %stream_capacity, + available = %stream.send_flow.available(), + requested = stream.requested_send_capacity, + buffered = stream.buffered_send_data, + "data frame" + ); + + // Zero length data frames always have capacity to + // be sent. + if sz > 0 && stream_capacity == 0 { + tracing::trace!("stream capacity is 0"); + + // Ensure that the stream is waiting for + // connection level capacity + // + // TODO: uncomment + // debug_assert!(stream.is_pending_send_capacity); + + // The stream has no more capacity, this can + // happen if the remote reduced the stream + // window. In this case, we need to buffer the + // frame and wait for a window update... + stream.pending_send.push_front(buffer, frame.into()); + + continue; + } + + // Only send up to the max frame length + let len = cmp::min(sz, max_len); + + // Only send up to the stream's window capacity + let len = + cmp::min(len, stream_capacity.as_size() as usize) as WindowSize; + + // There *must* be be enough connection level + // capacity at this point. + debug_assert!(len <= self.flow.window_size()); + + tracing::trace!(len, "sending data frame"); + + // Update the flow control + tracing::trace_span!("updating stream flow").in_scope(|| { + stream.send_flow.send_data(len); + + // Decrement the stream's buffered data counter + debug_assert!(stream.buffered_send_data >= len as usize); + stream.buffered_send_data -= len as usize; + stream.requested_send_capacity -= len; + + // If the capacity was limited because of the + // max_send_buffer_size, then consider waking + // the send task again... + stream.notify_if_can_buffer_more(self.max_buffer_size); + + // Assign the capacity back to the connection that + // was just consumed from the stream in the previous + // line. + self.flow.assign_capacity(len); + }); + + let (eos, len) = tracing::trace_span!("updating connection flow") + .in_scope(|| { + self.flow.send_data(len); + + // Wrap the frame's data payload to ensure that the + // correct amount of data gets written. + + let eos = frame.is_end_stream(); + let len = len as usize; + + if frame.payload().remaining() > len { + frame.set_end_stream(false); + } + (eos, len) + }); + + Frame::Data(frame.map(|buf| Prioritized { + inner: buf.take(len), + end_of_stream: eos, + stream: stream.key(), + })) + } + Some(Frame::PushPromise(pp)) => { + let mut pushed = + stream.store_mut().find_mut(&pp.promised_id()).unwrap(); + pushed.is_pending_push = false; + // Transition stream from pending_push to pending_open + // if possible + if !pushed.pending_send.is_empty() { + if counts.can_inc_num_send_streams() { + counts.inc_num_send_streams(&mut pushed); + self.pending_send.push(&mut pushed); + } else { + self.queue_open(&mut pushed); + } + } + Frame::PushPromise(pp) + } + Some(frame) => frame.map(|_| { + unreachable!( + "Frame::map closure will only be called \ + on DATA frames." + ) + }), + None => { + if let Some(reason) = stream.state.get_scheduled_reset() { + let stream_id = stream.id; + stream + .state + .set_reset(stream_id, reason, Initiator::Library); + + let frame = frame::Reset::new(stream.id, reason); + Frame::Reset(frame) + } else { + // If the stream receives a RESET from the peer, it may have + // had data buffered to be sent, but all the frames are cleared + // in clear_queue(). Instead of doing O(N) traversal through queue + // to remove, lets just ignore the stream here. + tracing::trace!("removing dangling stream from pending_send"); + // Since this should only happen as a consequence of `clear_queue`, + // we must be in a closed state of some kind. + debug_assert!(stream.state.is_closed()); + counts.transition_after(stream, is_pending_reset); + continue; + } + } + }; + + tracing::trace!("pop_frame; frame={:?}", frame); + + if cfg!(debug_assertions) && stream.state.is_idle() { + debug_assert!(stream.id > self.last_opened_id); + self.last_opened_id = stream.id; + } + + if !stream.pending_send.is_empty() || stream.state.is_scheduled_reset() { + // TODO: Only requeue the sender IF it is ready to send + // the next frame. i.e. don't requeue it if the next + // frame is a data frame and the stream does not have + // any more capacity. + self.pending_send.push(&mut stream); + } + + counts.transition_after(stream, is_pending_reset); + + return Some(frame); + } + None => return None, + } + } + } + + fn schedule_pending_open(&mut self, store: &mut Store, counts: &mut Counts) { + tracing::trace!("schedule_pending_open"); + // check for any pending open streams + while counts.can_inc_num_send_streams() { + if let Some(mut stream) = self.pending_open.pop(store) { + tracing::trace!("schedule_pending_open; stream={:?}", stream.id); + + counts.inc_num_send_streams(&mut stream); + self.pending_send.push(&mut stream); + stream.notify_send(); + } else { + return; + } + } + } +} + +// ===== impl Prioritized ===== + +impl<B> Buf for Prioritized<B> +where + B: Buf, +{ + fn remaining(&self) -> usize { + self.inner.remaining() + } + + fn chunk(&self) -> &[u8] { + self.inner.chunk() + } + + fn chunks_vectored<'a>(&'a self, dst: &mut [std::io::IoSlice<'a>]) -> usize { + self.inner.chunks_vectored(dst) + } + + fn advance(&mut self, cnt: usize) { + self.inner.advance(cnt) + } +} + +impl<B: Buf> fmt::Debug for Prioritized<B> { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + fmt.debug_struct("Prioritized") + .field("remaining", &self.inner.get_ref().remaining()) + .field("end_of_stream", &self.end_of_stream) + .field("stream", &self.stream) + .finish() + } +} diff --git a/third_party/rust/h2/src/proto/streams/recv.rs b/third_party/rust/h2/src/proto/streams/recv.rs new file mode 100644 index 0000000000..3af1af3a1d --- /dev/null +++ b/third_party/rust/h2/src/proto/streams/recv.rs @@ -0,0 +1,1097 @@ +use super::*; +use crate::codec::UserError; +use crate::frame::{self, PushPromiseHeaderError, Reason, DEFAULT_INITIAL_WINDOW_SIZE}; +use crate::proto::{self, Error}; +use std::task::Context; + +use http::{HeaderMap, Request, Response}; + +use std::io; +use std::task::{Poll, Waker}; +use std::time::{Duration, Instant}; + +#[derive(Debug)] +pub(super) struct Recv { + /// Initial window size of remote initiated streams + init_window_sz: WindowSize, + + /// Connection level flow control governing received data + flow: FlowControl, + + /// Amount of connection window capacity currently used by outstanding streams. + in_flight_data: WindowSize, + + /// The lowest stream ID that is still idle + next_stream_id: Result<StreamId, StreamIdOverflow>, + + /// The stream ID of the last processed stream + last_processed_id: StreamId, + + /// Any streams with a higher ID are ignored. + /// + /// This starts as MAX, but is lowered when a GOAWAY is received. + /// + /// > After sending a GOAWAY frame, the sender can discard frames for + /// > streams initiated by the receiver with identifiers higher than + /// > the identified last stream. + max_stream_id: StreamId, + + /// Streams that have pending window updates + pending_window_updates: store::Queue<stream::NextWindowUpdate>, + + /// New streams to be accepted + pending_accept: store::Queue<stream::NextAccept>, + + /// Locally reset streams that should be reaped when they expire + pending_reset_expired: store::Queue<stream::NextResetExpire>, + + /// How long locally reset streams should ignore received frames + reset_duration: Duration, + + /// Holds frames that are waiting to be read + buffer: Buffer<Event>, + + /// Refused StreamId, this represents a frame that must be sent out. + refused: Option<StreamId>, + + /// If push promises are allowed to be received. + is_push_enabled: bool, + + /// If extended connect protocol is enabled. + is_extended_connect_protocol_enabled: bool, +} + +#[derive(Debug)] +pub(super) enum Event { + Headers(peer::PollMessage), + Data(Bytes), + Trailers(HeaderMap), +} + +#[derive(Debug)] +pub(super) enum RecvHeaderBlockError<T> { + Oversize(T), + State(Error), +} + +#[derive(Debug)] +pub(crate) enum Open { + PushPromise, + Headers, +} + +impl Recv { + pub fn new(peer: peer::Dyn, config: &Config) -> Self { + let next_stream_id = if peer.is_server() { 1 } else { 2 }; + + let mut flow = FlowControl::new(); + + // connections always have the default window size, regardless of + // settings + flow.inc_window(DEFAULT_INITIAL_WINDOW_SIZE) + .expect("invalid initial remote window size"); + flow.assign_capacity(DEFAULT_INITIAL_WINDOW_SIZE); + + Recv { + init_window_sz: config.local_init_window_sz, + flow, + in_flight_data: 0 as WindowSize, + next_stream_id: Ok(next_stream_id.into()), + pending_window_updates: store::Queue::new(), + last_processed_id: StreamId::ZERO, + max_stream_id: StreamId::MAX, + pending_accept: store::Queue::new(), + pending_reset_expired: store::Queue::new(), + reset_duration: config.local_reset_duration, + buffer: Buffer::new(), + refused: None, + is_push_enabled: config.local_push_enabled, + is_extended_connect_protocol_enabled: config.extended_connect_protocol_enabled, + } + } + + /// Returns the initial receive window size + pub fn init_window_sz(&self) -> WindowSize { + self.init_window_sz + } + + /// Returns the ID of the last processed stream + pub fn last_processed_id(&self) -> StreamId { + self.last_processed_id + } + + /// Update state reflecting a new, remotely opened stream + /// + /// Returns the stream state if successful. `None` if refused + pub fn open( + &mut self, + id: StreamId, + mode: Open, + counts: &mut Counts, + ) -> Result<Option<StreamId>, Error> { + assert!(self.refused.is_none()); + + counts.peer().ensure_can_open(id, mode)?; + + let next_id = self.next_stream_id()?; + if id < next_id { + proto_err!(conn: "id ({:?}) < next_id ({:?})", id, next_id); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + + self.next_stream_id = id.next_id(); + + if !counts.can_inc_num_recv_streams() { + self.refused = Some(id); + return Ok(None); + } + + Ok(Some(id)) + } + + /// Transition the stream state based on receiving headers + /// + /// The caller ensures that the frame represents headers and not trailers. + pub fn recv_headers( + &mut self, + frame: frame::Headers, + stream: &mut store::Ptr, + counts: &mut Counts, + ) -> Result<(), RecvHeaderBlockError<Option<frame::Headers>>> { + tracing::trace!("opening stream; init_window={}", self.init_window_sz); + let is_initial = stream.state.recv_open(&frame)?; + + if is_initial { + // TODO: be smarter about this logic + if frame.stream_id() > self.last_processed_id { + self.last_processed_id = frame.stream_id(); + } + + // Increment the number of concurrent streams + counts.inc_num_recv_streams(stream); + } + + if !stream.content_length.is_head() { + use super::stream::ContentLength; + use http::header; + + if let Some(content_length) = frame.fields().get(header::CONTENT_LENGTH) { + let content_length = match frame::parse_u64(content_length.as_bytes()) { + Ok(v) => v, + Err(()) => { + proto_err!(stream: "could not parse content-length; stream={:?}", stream.id); + return Err(Error::library_reset(stream.id, Reason::PROTOCOL_ERROR).into()); + } + }; + + stream.content_length = ContentLength::Remaining(content_length); + } + } + + if frame.is_over_size() { + // A frame is over size if the decoded header block was bigger than + // SETTINGS_MAX_HEADER_LIST_SIZE. + // + // > A server that receives a larger header block than it is willing + // > to handle can send an HTTP 431 (Request Header Fields Too + // > Large) status code [RFC6585]. A client can discard responses + // > that it cannot process. + // + // So, if peer is a server, we'll send a 431. In either case, + // an error is recorded, which will send a REFUSED_STREAM, + // since we don't want any of the data frames either. + tracing::debug!( + "stream error REQUEST_HEADER_FIELDS_TOO_LARGE -- \ + recv_headers: frame is over size; stream={:?}", + stream.id + ); + return if counts.peer().is_server() && is_initial { + let mut res = frame::Headers::new( + stream.id, + frame::Pseudo::response(::http::StatusCode::REQUEST_HEADER_FIELDS_TOO_LARGE), + HeaderMap::new(), + ); + res.set_end_stream(); + Err(RecvHeaderBlockError::Oversize(Some(res))) + } else { + Err(RecvHeaderBlockError::Oversize(None)) + }; + } + + let stream_id = frame.stream_id(); + let (pseudo, fields) = frame.into_parts(); + + if pseudo.protocol.is_some() { + if counts.peer().is_server() && !self.is_extended_connect_protocol_enabled { + proto_err!(stream: "cannot use :protocol if extended connect protocol is disabled; stream={:?}", stream.id); + return Err(Error::library_reset(stream.id, Reason::PROTOCOL_ERROR).into()); + } + } + + if !pseudo.is_informational() { + let message = counts + .peer() + .convert_poll_message(pseudo, fields, stream_id)?; + + // Push the frame onto the stream's recv buffer + stream + .pending_recv + .push_back(&mut self.buffer, Event::Headers(message)); + stream.notify_recv(); + } + + // Only servers can receive a headers frame that initiates the stream. + // This is verified in `Streams` before calling this function. + if counts.peer().is_server() { + self.pending_accept.push(stream); + } + + Ok(()) + } + + /// Called by the server to get the request + /// + /// TODO: Should this fn return `Result`? + pub fn take_request(&mut self, stream: &mut store::Ptr) -> Request<()> { + use super::peer::PollMessage::*; + + match stream.pending_recv.pop_front(&mut self.buffer) { + Some(Event::Headers(Server(request))) => request, + _ => panic!(), + } + } + + /// Called by the client to get pushed response + pub fn poll_pushed( + &mut self, + cx: &Context, + stream: &mut store::Ptr, + ) -> Poll<Option<Result<(Request<()>, store::Key), proto::Error>>> { + use super::peer::PollMessage::*; + + let mut ppp = stream.pending_push_promises.take(); + let pushed = ppp.pop(stream.store_mut()).map(|mut pushed| { + match pushed.pending_recv.pop_front(&mut self.buffer) { + Some(Event::Headers(Server(headers))) => (headers, pushed.key()), + // When frames are pushed into the queue, it is verified that + // the first frame is a HEADERS frame. + _ => panic!("Headers not set on pushed stream"), + } + }); + stream.pending_push_promises = ppp; + if let Some(p) = pushed { + Poll::Ready(Some(Ok(p))) + } else { + let is_open = stream.state.ensure_recv_open()?; + + if is_open { + stream.recv_task = Some(cx.waker().clone()); + Poll::Pending + } else { + Poll::Ready(None) + } + } + } + + /// Called by the client to get the response + pub fn poll_response( + &mut self, + cx: &Context, + stream: &mut store::Ptr, + ) -> Poll<Result<Response<()>, proto::Error>> { + use super::peer::PollMessage::*; + + // If the buffer is not empty, then the first frame must be a HEADERS + // frame or the user violated the contract. + match stream.pending_recv.pop_front(&mut self.buffer) { + Some(Event::Headers(Client(response))) => Poll::Ready(Ok(response)), + Some(_) => panic!("poll_response called after response returned"), + None => { + stream.state.ensure_recv_open()?; + + stream.recv_task = Some(cx.waker().clone()); + Poll::Pending + } + } + } + + /// Transition the stream based on receiving trailers + pub fn recv_trailers( + &mut self, + frame: frame::Headers, + stream: &mut store::Ptr, + ) -> Result<(), Error> { + // Transition the state + stream.state.recv_close()?; + + if stream.ensure_content_length_zero().is_err() { + proto_err!(stream: "recv_trailers: content-length is not zero; stream={:?};", stream.id); + return Err(Error::library_reset(stream.id, Reason::PROTOCOL_ERROR)); + } + + let trailers = frame.into_fields(); + + // Push the frame onto the stream's recv buffer + stream + .pending_recv + .push_back(&mut self.buffer, Event::Trailers(trailers)); + stream.notify_recv(); + + Ok(()) + } + + /// Releases capacity of the connection + pub fn release_connection_capacity(&mut self, capacity: WindowSize, task: &mut Option<Waker>) { + tracing::trace!( + "release_connection_capacity; size={}, connection in_flight_data={}", + capacity, + self.in_flight_data, + ); + + // Decrement in-flight data + self.in_flight_data -= capacity; + + // Assign capacity to connection + self.flow.assign_capacity(capacity); + + if self.flow.unclaimed_capacity().is_some() { + if let Some(task) = task.take() { + task.wake(); + } + } + } + + /// Releases capacity back to the connection & stream + pub fn release_capacity( + &mut self, + capacity: WindowSize, + stream: &mut store::Ptr, + task: &mut Option<Waker>, + ) -> Result<(), UserError> { + tracing::trace!("release_capacity; size={}", capacity); + + if capacity > stream.in_flight_recv_data { + return Err(UserError::ReleaseCapacityTooBig); + } + + self.release_connection_capacity(capacity, task); + + // Decrement in-flight data + stream.in_flight_recv_data -= capacity; + + // Assign capacity to stream + stream.recv_flow.assign_capacity(capacity); + + if stream.recv_flow.unclaimed_capacity().is_some() { + // Queue the stream for sending the WINDOW_UPDATE frame. + self.pending_window_updates.push(stream); + + if let Some(task) = task.take() { + task.wake(); + } + } + + Ok(()) + } + + /// Release any unclaimed capacity for a closed stream. + pub fn release_closed_capacity(&mut self, stream: &mut store::Ptr, task: &mut Option<Waker>) { + debug_assert_eq!(stream.ref_count, 0); + + if stream.in_flight_recv_data == 0 { + return; + } + + tracing::trace!( + "auto-release closed stream ({:?}) capacity: {:?}", + stream.id, + stream.in_flight_recv_data, + ); + + self.release_connection_capacity(stream.in_flight_recv_data, task); + stream.in_flight_recv_data = 0; + + self.clear_recv_buffer(stream); + } + + /// Set the "target" connection window size. + /// + /// By default, all new connections start with 64kb of window size. As + /// streams used and release capacity, we will send WINDOW_UPDATEs for the + /// connection to bring it back up to the initial "target". + /// + /// Setting a target means that we will try to tell the peer about + /// WINDOW_UPDATEs so the peer knows it has about `target` window to use + /// for the whole connection. + /// + /// The `task` is an optional parked task for the `Connection` that might + /// be blocked on needing more window capacity. + pub fn set_target_connection_window(&mut self, target: WindowSize, task: &mut Option<Waker>) { + tracing::trace!( + "set_target_connection_window; target={}; available={}, reserved={}", + target, + self.flow.available(), + self.in_flight_data, + ); + + // The current target connection window is our `available` plus any + // in-flight data reserved by streams. + // + // Update the flow controller with the difference between the new + // target and the current target. + let current = (self.flow.available() + self.in_flight_data).checked_size(); + if target > current { + self.flow.assign_capacity(target - current); + } else { + self.flow.claim_capacity(current - target); + } + + // If changing the target capacity means we gained a bunch of capacity, + // enough that we went over the update threshold, then schedule sending + // a connection WINDOW_UPDATE. + if self.flow.unclaimed_capacity().is_some() { + if let Some(task) = task.take() { + task.wake(); + } + } + } + + pub(crate) fn apply_local_settings( + &mut self, + settings: &frame::Settings, + store: &mut Store, + ) -> Result<(), proto::Error> { + if let Some(val) = settings.is_extended_connect_protocol_enabled() { + self.is_extended_connect_protocol_enabled = val; + } + + if let Some(target) = settings.initial_window_size() { + let old_sz = self.init_window_sz; + self.init_window_sz = target; + + tracing::trace!("update_initial_window_size; new={}; old={}", target, old_sz,); + + // Per RFC 7540 §6.9.2: + // + // In addition to changing the flow-control window for streams that are + // not yet active, a SETTINGS frame can alter the initial flow-control + // window size for streams with active flow-control windows (that is, + // streams in the "open" or "half-closed (remote)" state). When the + // value of SETTINGS_INITIAL_WINDOW_SIZE changes, a receiver MUST adjust + // the size of all stream flow-control windows that it maintains by the + // difference between the new value and the old value. + // + // A change to `SETTINGS_INITIAL_WINDOW_SIZE` can cause the available + // space in a flow-control window to become negative. A sender MUST + // track the negative flow-control window and MUST NOT send new + // flow-controlled frames until it receives WINDOW_UPDATE frames that + // cause the flow-control window to become positive. + + if target < old_sz { + // We must decrease the (local) window on every open stream. + let dec = old_sz - target; + tracing::trace!("decrementing all windows; dec={}", dec); + + store.for_each(|mut stream| { + stream.recv_flow.dec_recv_window(dec); + }) + } else if target > old_sz { + // We must increase the (local) window on every open stream. + let inc = target - old_sz; + tracing::trace!("incrementing all windows; inc={}", inc); + store.try_for_each(|mut stream| { + // XXX: Shouldn't the peer have already noticed our + // overflow and sent us a GOAWAY? + stream + .recv_flow + .inc_window(inc) + .map_err(proto::Error::library_go_away)?; + stream.recv_flow.assign_capacity(inc); + Ok::<_, proto::Error>(()) + })?; + } + } + + Ok(()) + } + + pub fn is_end_stream(&self, stream: &store::Ptr) -> bool { + if !stream.state.is_recv_closed() { + return false; + } + + stream.pending_recv.is_empty() + } + + pub fn recv_data(&mut self, frame: frame::Data, stream: &mut store::Ptr) -> Result<(), Error> { + let sz = frame.payload().len(); + + // This should have been enforced at the codec::FramedRead layer, so + // this is just a sanity check. + assert!(sz <= MAX_WINDOW_SIZE as usize); + + let sz = sz as WindowSize; + + let is_ignoring_frame = stream.state.is_local_reset(); + + if !is_ignoring_frame && !stream.state.is_recv_streaming() { + // TODO: There are cases where this can be a stream error of + // STREAM_CLOSED instead... + + // Receiving a DATA frame when not expecting one is a protocol + // error. + proto_err!(conn: "unexpected DATA frame; stream={:?}", stream.id); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + + tracing::trace!( + "recv_data; size={}; connection={}; stream={}", + sz, + self.flow.window_size(), + stream.recv_flow.window_size() + ); + + if is_ignoring_frame { + tracing::trace!( + "recv_data; frame ignored on locally reset {:?} for some time", + stream.id, + ); + return Ok(self.ignore_data(sz)?); + } + + // Ensure that there is enough capacity on the connection before acting + // on the stream. + self.consume_connection_window(sz)?; + + if stream.recv_flow.window_size() < sz { + // http://httpwg.org/specs/rfc7540.html#WINDOW_UPDATE + // > A receiver MAY respond with a stream error (Section 5.4.2) or + // > connection error (Section 5.4.1) of type FLOW_CONTROL_ERROR if + // > it is unable to accept a frame. + // + // So, for violating the **stream** window, we can send either a + // stream or connection error. We've opted to send a stream + // error. + return Err(Error::library_reset(stream.id, Reason::FLOW_CONTROL_ERROR)); + } + + if stream.dec_content_length(frame.payload().len()).is_err() { + proto_err!(stream: + "recv_data: content-length overflow; stream={:?}; len={:?}", + stream.id, + frame.payload().len(), + ); + return Err(Error::library_reset(stream.id, Reason::PROTOCOL_ERROR)); + } + + if frame.is_end_stream() { + if stream.ensure_content_length_zero().is_err() { + proto_err!(stream: + "recv_data: content-length underflow; stream={:?}; len={:?}", + stream.id, + frame.payload().len(), + ); + return Err(Error::library_reset(stream.id, Reason::PROTOCOL_ERROR)); + } + + if stream.state.recv_close().is_err() { + proto_err!(conn: "recv_data: failed to transition to closed state; stream={:?}", stream.id); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR).into()); + } + } + + // Update stream level flow control + stream.recv_flow.send_data(sz); + + // Track the data as in-flight + stream.in_flight_recv_data += sz; + + let event = Event::Data(frame.into_payload()); + + // Push the frame onto the recv buffer + stream.pending_recv.push_back(&mut self.buffer, event); + stream.notify_recv(); + + Ok(()) + } + + pub fn ignore_data(&mut self, sz: WindowSize) -> Result<(), Error> { + // Ensure that there is enough capacity on the connection... + self.consume_connection_window(sz)?; + + // Since we are ignoring this frame, + // we aren't returning the frame to the user. That means they + // have no way to release the capacity back to the connection. So + // we have to release it automatically. + // + // This call doesn't send a WINDOW_UPDATE immediately, just marks + // the capacity as available to be reclaimed. When the available + // capacity meets a threshold, a WINDOW_UPDATE is then sent. + self.release_connection_capacity(sz, &mut None); + Ok(()) + } + + pub fn consume_connection_window(&mut self, sz: WindowSize) -> Result<(), Error> { + if self.flow.window_size() < sz { + tracing::debug!( + "connection error FLOW_CONTROL_ERROR -- window_size ({:?}) < sz ({:?});", + self.flow.window_size(), + sz, + ); + return Err(Error::library_go_away(Reason::FLOW_CONTROL_ERROR)); + } + + // Update connection level flow control + self.flow.send_data(sz); + + // Track the data as in-flight + self.in_flight_data += sz; + Ok(()) + } + + pub fn recv_push_promise( + &mut self, + frame: frame::PushPromise, + stream: &mut store::Ptr, + ) -> Result<(), Error> { + stream.state.reserve_remote()?; + if frame.is_over_size() { + // A frame is over size if the decoded header block was bigger than + // SETTINGS_MAX_HEADER_LIST_SIZE. + // + // > A server that receives a larger header block than it is willing + // > to handle can send an HTTP 431 (Request Header Fields Too + // > Large) status code [RFC6585]. A client can discard responses + // > that it cannot process. + // + // So, if peer is a server, we'll send a 431. In either case, + // an error is recorded, which will send a REFUSED_STREAM, + // since we don't want any of the data frames either. + tracing::debug!( + "stream error REFUSED_STREAM -- recv_push_promise: \ + headers frame is over size; promised_id={:?};", + frame.promised_id(), + ); + return Err(Error::library_reset( + frame.promised_id(), + Reason::REFUSED_STREAM, + )); + } + + let promised_id = frame.promised_id(); + let (pseudo, fields) = frame.into_parts(); + let req = crate::server::Peer::convert_poll_message(pseudo, fields, promised_id)?; + + if let Err(e) = frame::PushPromise::validate_request(&req) { + use PushPromiseHeaderError::*; + match e { + NotSafeAndCacheable => proto_err!( + stream: + "recv_push_promise: method {} is not safe and cacheable; promised_id={:?}", + req.method(), + promised_id, + ), + InvalidContentLength(e) => proto_err!( + stream: + "recv_push_promise; promised request has invalid content-length {:?}; promised_id={:?}", + e, + promised_id, + ), + } + return Err(Error::library_reset(promised_id, Reason::PROTOCOL_ERROR)); + } + + use super::peer::PollMessage::*; + stream + .pending_recv + .push_back(&mut self.buffer, Event::Headers(Server(req))); + stream.notify_recv(); + Ok(()) + } + + /// Ensures that `id` is not in the `Idle` state. + pub fn ensure_not_idle(&self, id: StreamId) -> Result<(), Reason> { + if let Ok(next) = self.next_stream_id { + if id >= next { + tracing::debug!( + "stream ID implicitly closed, PROTOCOL_ERROR; stream={:?}", + id + ); + return Err(Reason::PROTOCOL_ERROR); + } + } + // if next_stream_id is overflowed, that's ok. + + Ok(()) + } + + /// Handle remote sending an explicit RST_STREAM. + pub fn recv_reset(&mut self, frame: frame::Reset, stream: &mut Stream) { + // Notify the stream + stream.state.recv_reset(frame, stream.is_pending_send); + + stream.notify_send(); + stream.notify_recv(); + } + + /// Handle a connection-level error + pub fn handle_error(&mut self, err: &proto::Error, stream: &mut Stream) { + // Receive an error + stream.state.handle_error(err); + + // If a receiver is waiting, notify it + stream.notify_send(); + stream.notify_recv(); + } + + pub fn go_away(&mut self, last_processed_id: StreamId) { + assert!(self.max_stream_id >= last_processed_id); + self.max_stream_id = last_processed_id; + } + + pub fn recv_eof(&mut self, stream: &mut Stream) { + stream.state.recv_eof(); + stream.notify_send(); + stream.notify_recv(); + } + + pub(super) fn clear_recv_buffer(&mut self, stream: &mut Stream) { + while let Some(_) = stream.pending_recv.pop_front(&mut self.buffer) { + // drop it + } + } + + /// Get the max ID of streams we can receive. + /// + /// This gets lowered if we send a GOAWAY frame. + pub fn max_stream_id(&self) -> StreamId { + self.max_stream_id + } + + pub fn next_stream_id(&self) -> Result<StreamId, Error> { + if let Ok(id) = self.next_stream_id { + Ok(id) + } else { + Err(Error::library_go_away(Reason::PROTOCOL_ERROR)) + } + } + + pub fn may_have_created_stream(&self, id: StreamId) -> bool { + if let Ok(next_id) = self.next_stream_id { + // Peer::is_local_init should have been called beforehand + debug_assert_eq!(id.is_server_initiated(), next_id.is_server_initiated(),); + id < next_id + } else { + true + } + } + + pub(super) fn maybe_reset_next_stream_id(&mut self, id: StreamId) { + if let Ok(next_id) = self.next_stream_id { + // !Peer::is_local_init should have been called beforehand + debug_assert_eq!(id.is_server_initiated(), next_id.is_server_initiated()); + if id >= next_id { + self.next_stream_id = id.next_id(); + } + } + } + + /// Returns true if the remote peer can reserve a stream with the given ID. + pub fn ensure_can_reserve(&self) -> Result<(), Error> { + if !self.is_push_enabled { + proto_err!(conn: "recv_push_promise: push is disabled"); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + + Ok(()) + } + + /// Add a locally reset stream to queue to be eventually reaped. + pub fn enqueue_reset_expiration(&mut self, stream: &mut store::Ptr, counts: &mut Counts) { + if !stream.state.is_local_reset() || stream.is_pending_reset_expiration() { + return; + } + + tracing::trace!("enqueue_reset_expiration; {:?}", stream.id); + + if !counts.can_inc_num_reset_streams() { + // try to evict 1 stream if possible + // if max allow is 0, this won't be able to evict, + // and then we'll just bail after + if let Some(evicted) = self.pending_reset_expired.pop(stream.store_mut()) { + counts.transition_after(evicted, true); + } + } + + if counts.can_inc_num_reset_streams() { + counts.inc_num_reset_streams(); + self.pending_reset_expired.push(stream); + } + } + + /// Send any pending refusals. + pub fn send_pending_refusal<T, B>( + &mut self, + cx: &mut Context, + dst: &mut Codec<T, Prioritized<B>>, + ) -> Poll<io::Result<()>> + where + T: AsyncWrite + Unpin, + B: Buf, + { + if let Some(stream_id) = self.refused { + ready!(dst.poll_ready(cx))?; + + // Create the RST_STREAM frame + let frame = frame::Reset::new(stream_id, Reason::REFUSED_STREAM); + + // Buffer the frame + dst.buffer(frame.into()).expect("invalid RST_STREAM frame"); + } + + self.refused = None; + + Poll::Ready(Ok(())) + } + + pub fn clear_expired_reset_streams(&mut self, store: &mut Store, counts: &mut Counts) { + if !self.pending_reset_expired.is_empty() { + let now = Instant::now(); + let reset_duration = self.reset_duration; + while let Some(stream) = self.pending_reset_expired.pop_if(store, |stream| { + let reset_at = stream.reset_at.expect("reset_at must be set if in queue"); + // rust-lang/rust#86470 tracks a bug in the standard library where `Instant` + // subtraction can panic (because, on some platforms, `Instant` isn't actually + // monotonic). We use a saturating operation to avoid this panic here. + now.saturating_duration_since(reset_at) > reset_duration + }) { + counts.transition_after(stream, true); + } + } + } + + pub fn clear_queues( + &mut self, + clear_pending_accept: bool, + store: &mut Store, + counts: &mut Counts, + ) { + self.clear_stream_window_update_queue(store, counts); + self.clear_all_reset_streams(store, counts); + + if clear_pending_accept { + self.clear_all_pending_accept(store, counts); + } + } + + fn clear_stream_window_update_queue(&mut self, store: &mut Store, counts: &mut Counts) { + while let Some(stream) = self.pending_window_updates.pop(store) { + counts.transition(stream, |_, stream| { + tracing::trace!("clear_stream_window_update_queue; stream={:?}", stream.id); + }) + } + } + + /// Called on EOF + fn clear_all_reset_streams(&mut self, store: &mut Store, counts: &mut Counts) { + while let Some(stream) = self.pending_reset_expired.pop(store) { + counts.transition_after(stream, true); + } + } + + fn clear_all_pending_accept(&mut self, store: &mut Store, counts: &mut Counts) { + while let Some(stream) = self.pending_accept.pop(store) { + counts.transition_after(stream, false); + } + } + + pub fn poll_complete<T, B>( + &mut self, + cx: &mut Context, + store: &mut Store, + counts: &mut Counts, + dst: &mut Codec<T, Prioritized<B>>, + ) -> Poll<io::Result<()>> + where + T: AsyncWrite + Unpin, + B: Buf, + { + // Send any pending connection level window updates + ready!(self.send_connection_window_update(cx, dst))?; + + // Send any pending stream level window updates + ready!(self.send_stream_window_updates(cx, store, counts, dst))?; + + Poll::Ready(Ok(())) + } + + /// Send connection level window update + fn send_connection_window_update<T, B>( + &mut self, + cx: &mut Context, + dst: &mut Codec<T, Prioritized<B>>, + ) -> Poll<io::Result<()>> + where + T: AsyncWrite + Unpin, + B: Buf, + { + if let Some(incr) = self.flow.unclaimed_capacity() { + let frame = frame::WindowUpdate::new(StreamId::zero(), incr); + + // Ensure the codec has capacity + ready!(dst.poll_ready(cx))?; + + // Buffer the WINDOW_UPDATE frame + dst.buffer(frame.into()) + .expect("invalid WINDOW_UPDATE frame"); + + // Update flow control + self.flow + .inc_window(incr) + .expect("unexpected flow control state"); + } + + Poll::Ready(Ok(())) + } + + /// Send stream level window update + pub fn send_stream_window_updates<T, B>( + &mut self, + cx: &mut Context, + store: &mut Store, + counts: &mut Counts, + dst: &mut Codec<T, Prioritized<B>>, + ) -> Poll<io::Result<()>> + where + T: AsyncWrite + Unpin, + B: Buf, + { + loop { + // Ensure the codec has capacity + ready!(dst.poll_ready(cx))?; + + // Get the next stream + let stream = match self.pending_window_updates.pop(store) { + Some(stream) => stream, + None => return Poll::Ready(Ok(())), + }; + + counts.transition(stream, |_, stream| { + tracing::trace!("pending_window_updates -- pop; stream={:?}", stream.id); + debug_assert!(!stream.is_pending_window_update); + + if !stream.state.is_recv_streaming() { + // No need to send window updates on the stream if the stream is + // no longer receiving data. + // + // TODO: is this correct? We could possibly send a window + // update on a ReservedRemote stream if we already know + // we want to stream the data faster... + return; + } + + // TODO: de-dup + if let Some(incr) = stream.recv_flow.unclaimed_capacity() { + // Create the WINDOW_UPDATE frame + let frame = frame::WindowUpdate::new(stream.id, incr); + + // Buffer it + dst.buffer(frame.into()) + .expect("invalid WINDOW_UPDATE frame"); + + // Update flow control + stream + .recv_flow + .inc_window(incr) + .expect("unexpected flow control state"); + } + }) + } + } + + pub fn next_incoming(&mut self, store: &mut Store) -> Option<store::Key> { + self.pending_accept.pop(store).map(|ptr| ptr.key()) + } + + pub fn poll_data( + &mut self, + cx: &Context, + stream: &mut Stream, + ) -> Poll<Option<Result<Bytes, proto::Error>>> { + // TODO: Return error when the stream is reset + match stream.pending_recv.pop_front(&mut self.buffer) { + Some(Event::Data(payload)) => Poll::Ready(Some(Ok(payload))), + Some(event) => { + // Frame is trailer + stream.pending_recv.push_front(&mut self.buffer, event); + + // Notify the recv task. This is done just in case + // `poll_trailers` was called. + // + // It is very likely that `notify_recv` will just be a no-op (as + // the task will be None), so this isn't really much of a + // performance concern. It also means we don't have to track + // state to see if `poll_trailers` was called before `poll_data` + // returned `None`. + stream.notify_recv(); + + // No more data frames + Poll::Ready(None) + } + None => self.schedule_recv(cx, stream), + } + } + + pub fn poll_trailers( + &mut self, + cx: &Context, + stream: &mut Stream, + ) -> Poll<Option<Result<HeaderMap, proto::Error>>> { + match stream.pending_recv.pop_front(&mut self.buffer) { + Some(Event::Trailers(trailers)) => Poll::Ready(Some(Ok(trailers))), + Some(event) => { + // Frame is not trailers.. not ready to poll trailers yet. + stream.pending_recv.push_front(&mut self.buffer, event); + + Poll::Pending + } + None => self.schedule_recv(cx, stream), + } + } + + fn schedule_recv<T>( + &mut self, + cx: &Context, + stream: &mut Stream, + ) -> Poll<Option<Result<T, proto::Error>>> { + if stream.state.ensure_recv_open()? { + // Request to get notified once more frames arrive + stream.recv_task = Some(cx.waker().clone()); + Poll::Pending + } else { + // No more frames will be received + Poll::Ready(None) + } + } +} + +// ===== impl Open ===== + +impl Open { + pub fn is_push_promise(&self) -> bool { + use self::Open::*; + + match *self { + PushPromise => true, + _ => false, + } + } +} + +// ===== impl RecvHeaderBlockError ===== + +impl<T> From<Error> for RecvHeaderBlockError<T> { + fn from(err: Error) -> Self { + RecvHeaderBlockError::State(err) + } +} diff --git a/third_party/rust/h2/src/proto/streams/send.rs b/third_party/rust/h2/src/proto/streams/send.rs new file mode 100644 index 0000000000..2c5a38c801 --- /dev/null +++ b/third_party/rust/h2/src/proto/streams/send.rs @@ -0,0 +1,565 @@ +use super::{ + store, Buffer, Codec, Config, Counts, Frame, Prioritize, Prioritized, Store, Stream, StreamId, + StreamIdOverflow, WindowSize, +}; +use crate::codec::UserError; +use crate::frame::{self, Reason}; +use crate::proto::{Error, Initiator}; + +use bytes::Buf; +use http; +use std::task::{Context, Poll, Waker}; +use tokio::io::AsyncWrite; + +use std::io; + +/// Manages state transitions related to outbound frames. +#[derive(Debug)] +pub(super) struct Send { + /// Stream identifier to use for next initialized stream. + next_stream_id: Result<StreamId, StreamIdOverflow>, + + /// Any streams with a higher ID are ignored. + /// + /// This starts as MAX, but is lowered when a GOAWAY is received. + /// + /// > After sending a GOAWAY frame, the sender can discard frames for + /// > streams initiated by the receiver with identifiers higher than + /// > the identified last stream. + max_stream_id: StreamId, + + /// Initial window size of locally initiated streams + init_window_sz: WindowSize, + + /// Prioritization layer + prioritize: Prioritize, + + is_push_enabled: bool, + + /// If extended connect protocol is enabled. + is_extended_connect_protocol_enabled: bool, +} + +/// A value to detect which public API has called `poll_reset`. +#[derive(Debug)] +pub(crate) enum PollReset { + AwaitingHeaders, + Streaming, +} + +impl Send { + /// Create a new `Send` + pub fn new(config: &Config) -> Self { + Send { + init_window_sz: config.remote_init_window_sz, + max_stream_id: StreamId::MAX, + next_stream_id: Ok(config.local_next_stream_id), + prioritize: Prioritize::new(config), + is_push_enabled: true, + is_extended_connect_protocol_enabled: false, + } + } + + /// Returns the initial send window size + pub fn init_window_sz(&self) -> WindowSize { + self.init_window_sz + } + + pub fn open(&mut self) -> Result<StreamId, UserError> { + let stream_id = self.ensure_next_stream_id()?; + self.next_stream_id = stream_id.next_id(); + Ok(stream_id) + } + + pub fn reserve_local(&mut self) -> Result<StreamId, UserError> { + let stream_id = self.ensure_next_stream_id()?; + self.next_stream_id = stream_id.next_id(); + Ok(stream_id) + } + + fn check_headers(fields: &http::HeaderMap) -> Result<(), UserError> { + // 8.1.2.2. Connection-Specific Header Fields + if fields.contains_key(http::header::CONNECTION) + || fields.contains_key(http::header::TRANSFER_ENCODING) + || fields.contains_key(http::header::UPGRADE) + || fields.contains_key("keep-alive") + || fields.contains_key("proxy-connection") + { + tracing::debug!("illegal connection-specific headers found"); + return Err(UserError::MalformedHeaders); + } else if let Some(te) = fields.get(http::header::TE) { + if te != "trailers" { + tracing::debug!("illegal connection-specific headers found"); + return Err(UserError::MalformedHeaders); + } + } + Ok(()) + } + + pub fn send_push_promise<B>( + &mut self, + frame: frame::PushPromise, + buffer: &mut Buffer<Frame<B>>, + stream: &mut store::Ptr, + task: &mut Option<Waker>, + ) -> Result<(), UserError> { + if !self.is_push_enabled { + return Err(UserError::PeerDisabledServerPush); + } + + tracing::trace!( + "send_push_promise; frame={:?}; init_window={:?}", + frame, + self.init_window_sz + ); + + Self::check_headers(frame.fields())?; + + // Queue the frame for sending + self.prioritize + .queue_frame(frame.into(), buffer, stream, task); + + Ok(()) + } + + pub fn send_headers<B>( + &mut self, + frame: frame::Headers, + buffer: &mut Buffer<Frame<B>>, + stream: &mut store::Ptr, + counts: &mut Counts, + task: &mut Option<Waker>, + ) -> Result<(), UserError> { + tracing::trace!( + "send_headers; frame={:?}; init_window={:?}", + frame, + self.init_window_sz + ); + + Self::check_headers(frame.fields())?; + + let end_stream = frame.is_end_stream(); + + // Update the state + stream.state.send_open(end_stream)?; + + if counts.peer().is_local_init(frame.stream_id()) { + // If we're waiting on a PushPromise anyway + // handle potentially queueing the stream at that point + if !stream.is_pending_push { + if counts.can_inc_num_send_streams() { + counts.inc_num_send_streams(stream); + } else { + self.prioritize.queue_open(stream); + } + } + } + + // Queue the frame for sending + self.prioritize + .queue_frame(frame.into(), buffer, stream, task); + + Ok(()) + } + + /// Send an explicit RST_STREAM frame + pub fn send_reset<B>( + &mut self, + reason: Reason, + initiator: Initiator, + buffer: &mut Buffer<Frame<B>>, + stream: &mut store::Ptr, + counts: &mut Counts, + task: &mut Option<Waker>, + ) { + let is_reset = stream.state.is_reset(); + let is_closed = stream.state.is_closed(); + let is_empty = stream.pending_send.is_empty(); + let stream_id = stream.id; + + tracing::trace!( + "send_reset(..., reason={:?}, initiator={:?}, stream={:?}, ..., \ + is_reset={:?}; is_closed={:?}; pending_send.is_empty={:?}; \ + state={:?} \ + ", + reason, + initiator, + stream_id, + is_reset, + is_closed, + is_empty, + stream.state + ); + + if is_reset { + // Don't double reset + tracing::trace!( + " -> not sending RST_STREAM ({:?} is already reset)", + stream_id + ); + return; + } + + // Transition the state to reset no matter what. + stream.state.set_reset(stream_id, reason, initiator); + + // If closed AND the send queue is flushed, then the stream cannot be + // reset explicitly, either. Implicit resets can still be queued. + if is_closed && is_empty { + tracing::trace!( + " -> not sending explicit RST_STREAM ({:?} was closed \ + and send queue was flushed)", + stream_id + ); + return; + } + + // Clear all pending outbound frames. + // Note that we don't call `self.recv_err` because we want to enqueue + // the reset frame before transitioning the stream inside + // `reclaim_all_capacity`. + self.prioritize.clear_queue(buffer, stream); + + let frame = frame::Reset::new(stream.id, reason); + + tracing::trace!("send_reset -- queueing; frame={:?}", frame); + self.prioritize + .queue_frame(frame.into(), buffer, stream, task); + self.prioritize.reclaim_all_capacity(stream, counts); + } + + pub fn schedule_implicit_reset( + &mut self, + stream: &mut store::Ptr, + reason: Reason, + counts: &mut Counts, + task: &mut Option<Waker>, + ) { + if stream.state.is_closed() { + // Stream is already closed, nothing more to do + return; + } + + stream.state.set_scheduled_reset(reason); + + self.prioritize.reclaim_reserved_capacity(stream, counts); + self.prioritize.schedule_send(stream, task); + } + + pub fn send_data<B>( + &mut self, + frame: frame::Data<B>, + buffer: &mut Buffer<Frame<B>>, + stream: &mut store::Ptr, + counts: &mut Counts, + task: &mut Option<Waker>, + ) -> Result<(), UserError> + where + B: Buf, + { + self.prioritize + .send_data(frame, buffer, stream, counts, task) + } + + pub fn send_trailers<B>( + &mut self, + frame: frame::Headers, + buffer: &mut Buffer<Frame<B>>, + stream: &mut store::Ptr, + counts: &mut Counts, + task: &mut Option<Waker>, + ) -> Result<(), UserError> { + // TODO: Should this logic be moved into state.rs? + if !stream.state.is_send_streaming() { + return Err(UserError::UnexpectedFrameType); + } + + stream.state.send_close(); + + tracing::trace!("send_trailers -- queuing; frame={:?}", frame); + self.prioritize + .queue_frame(frame.into(), buffer, stream, task); + + // Release any excess capacity + self.prioritize.reserve_capacity(0, stream, counts); + + Ok(()) + } + + pub fn poll_complete<T, B>( + &mut self, + cx: &mut Context, + buffer: &mut Buffer<Frame<B>>, + store: &mut Store, + counts: &mut Counts, + dst: &mut Codec<T, Prioritized<B>>, + ) -> Poll<io::Result<()>> + where + T: AsyncWrite + Unpin, + B: Buf, + { + self.prioritize + .poll_complete(cx, buffer, store, counts, dst) + } + + /// Request capacity to send data + pub fn reserve_capacity( + &mut self, + capacity: WindowSize, + stream: &mut store::Ptr, + counts: &mut Counts, + ) { + self.prioritize.reserve_capacity(capacity, stream, counts) + } + + pub fn poll_capacity( + &mut self, + cx: &Context, + stream: &mut store::Ptr, + ) -> Poll<Option<Result<WindowSize, UserError>>> { + if !stream.state.is_send_streaming() { + return Poll::Ready(None); + } + + if !stream.send_capacity_inc { + stream.wait_send(cx); + return Poll::Pending; + } + + stream.send_capacity_inc = false; + + Poll::Ready(Some(Ok(self.capacity(stream)))) + } + + /// Current available stream send capacity + pub fn capacity(&self, stream: &mut store::Ptr) -> WindowSize { + let available = stream.send_flow.available().as_size() as usize; + let buffered = stream.buffered_send_data; + + available + .min(self.prioritize.max_buffer_size()) + .saturating_sub(buffered) as WindowSize + } + + pub fn poll_reset( + &self, + cx: &Context, + stream: &mut Stream, + mode: PollReset, + ) -> Poll<Result<Reason, crate::Error>> { + match stream.state.ensure_reason(mode)? { + Some(reason) => Poll::Ready(Ok(reason)), + None => { + stream.wait_send(cx); + Poll::Pending + } + } + } + + pub fn recv_connection_window_update( + &mut self, + frame: frame::WindowUpdate, + store: &mut Store, + counts: &mut Counts, + ) -> Result<(), Reason> { + self.prioritize + .recv_connection_window_update(frame.size_increment(), store, counts) + } + + pub fn recv_stream_window_update<B>( + &mut self, + sz: WindowSize, + buffer: &mut Buffer<Frame<B>>, + stream: &mut store::Ptr, + counts: &mut Counts, + task: &mut Option<Waker>, + ) -> Result<(), Reason> { + if let Err(e) = self.prioritize.recv_stream_window_update(sz, stream) { + tracing::debug!("recv_stream_window_update !!; err={:?}", e); + + self.send_reset( + Reason::FLOW_CONTROL_ERROR, + Initiator::Library, + buffer, + stream, + counts, + task, + ); + + return Err(e); + } + + Ok(()) + } + + pub(super) fn recv_go_away(&mut self, last_stream_id: StreamId) -> Result<(), Error> { + if last_stream_id > self.max_stream_id { + // The remote endpoint sent a `GOAWAY` frame indicating a stream + // that we never sent, or that we have already terminated on account + // of previous `GOAWAY` frame. In either case, that is illegal. + // (When sending multiple `GOAWAY`s, "Endpoints MUST NOT increase + // the value they send in the last stream identifier, since the + // peers might already have retried unprocessed requests on another + // connection.") + proto_err!(conn: + "recv_go_away: last_stream_id ({:?}) > max_stream_id ({:?})", + last_stream_id, self.max_stream_id, + ); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + + self.max_stream_id = last_stream_id; + Ok(()) + } + + pub fn handle_error<B>( + &mut self, + buffer: &mut Buffer<Frame<B>>, + stream: &mut store::Ptr, + counts: &mut Counts, + ) { + // Clear all pending outbound frames + self.prioritize.clear_queue(buffer, stream); + self.prioritize.reclaim_all_capacity(stream, counts); + } + + pub fn apply_remote_settings<B>( + &mut self, + settings: &frame::Settings, + buffer: &mut Buffer<Frame<B>>, + store: &mut Store, + counts: &mut Counts, + task: &mut Option<Waker>, + ) -> Result<(), Error> { + if let Some(val) = settings.is_extended_connect_protocol_enabled() { + self.is_extended_connect_protocol_enabled = val; + } + + // Applies an update to the remote endpoint's initial window size. + // + // Per RFC 7540 §6.9.2: + // + // In addition to changing the flow-control window for streams that are + // not yet active, a SETTINGS frame can alter the initial flow-control + // window size for streams with active flow-control windows (that is, + // streams in the "open" or "half-closed (remote)" state). When the + // value of SETTINGS_INITIAL_WINDOW_SIZE changes, a receiver MUST adjust + // the size of all stream flow-control windows that it maintains by the + // difference between the new value and the old value. + // + // A change to `SETTINGS_INITIAL_WINDOW_SIZE` can cause the available + // space in a flow-control window to become negative. A sender MUST + // track the negative flow-control window and MUST NOT send new + // flow-controlled frames until it receives WINDOW_UPDATE frames that + // cause the flow-control window to become positive. + if let Some(val) = settings.initial_window_size() { + let old_val = self.init_window_sz; + self.init_window_sz = val; + + if val < old_val { + // We must decrease the (remote) window on every open stream. + let dec = old_val - val; + tracing::trace!("decrementing all windows; dec={}", dec); + + let mut total_reclaimed = 0; + store.for_each(|mut stream| { + let stream = &mut *stream; + + stream.send_flow.dec_send_window(dec); + + // It's possible that decreasing the window causes + // `window_size` (the stream-specific window) to fall below + // `available` (the portion of the connection-level window + // that we have allocated to the stream). + // In this case, we should take that excess allocation away + // and reassign it to other streams. + let window_size = stream.send_flow.window_size(); + let available = stream.send_flow.available().as_size(); + let reclaimed = if available > window_size { + // Drop down to `window_size`. + let reclaim = available - window_size; + stream.send_flow.claim_capacity(reclaim); + total_reclaimed += reclaim; + reclaim + } else { + 0 + }; + + tracing::trace!( + "decremented stream window; id={:?}; decr={}; reclaimed={}; flow={:?}", + stream.id, + dec, + reclaimed, + stream.send_flow + ); + + // TODO: Should this notify the producer when the capacity + // of a stream is reduced? Maybe it should if the capacity + // is reduced to zero, allowing the producer to stop work. + }); + + self.prioritize + .assign_connection_capacity(total_reclaimed, store, counts); + } else if val > old_val { + let inc = val - old_val; + + store.try_for_each(|mut stream| { + self.recv_stream_window_update(inc, buffer, &mut stream, counts, task) + .map_err(Error::library_go_away) + })?; + } + } + + if let Some(val) = settings.is_push_enabled() { + self.is_push_enabled = val + } + + Ok(()) + } + + pub fn clear_queues(&mut self, store: &mut Store, counts: &mut Counts) { + self.prioritize.clear_pending_capacity(store, counts); + self.prioritize.clear_pending_send(store, counts); + self.prioritize.clear_pending_open(store, counts); + } + + pub fn ensure_not_idle(&self, id: StreamId) -> Result<(), Reason> { + if let Ok(next) = self.next_stream_id { + if id >= next { + return Err(Reason::PROTOCOL_ERROR); + } + } + // if next_stream_id is overflowed, that's ok. + + Ok(()) + } + + pub fn ensure_next_stream_id(&self) -> Result<StreamId, UserError> { + self.next_stream_id + .map_err(|_| UserError::OverflowedStreamId) + } + + pub fn may_have_created_stream(&self, id: StreamId) -> bool { + if let Ok(next_id) = self.next_stream_id { + // Peer::is_local_init should have been called beforehand + debug_assert_eq!(id.is_server_initiated(), next_id.is_server_initiated(),); + id < next_id + } else { + true + } + } + + pub(super) fn maybe_reset_next_stream_id(&mut self, id: StreamId) { + if let Ok(next_id) = self.next_stream_id { + // Peer::is_local_init should have been called beforehand + debug_assert_eq!(id.is_server_initiated(), next_id.is_server_initiated()); + if id >= next_id { + self.next_stream_id = id.next_id(); + } + } + } + + pub(crate) fn is_extended_connect_protocol_enabled(&self) -> bool { + self.is_extended_connect_protocol_enabled + } +} diff --git a/third_party/rust/h2/src/proto/streams/state.rs b/third_party/rust/h2/src/proto/streams/state.rs new file mode 100644 index 0000000000..9931d41b1c --- /dev/null +++ b/third_party/rust/h2/src/proto/streams/state.rs @@ -0,0 +1,472 @@ +use std::io; + +use crate::codec::UserError; +use crate::frame::{self, Reason, StreamId}; +use crate::proto::{self, Error, Initiator, PollReset}; + +use self::Inner::*; +use self::Peer::*; + +/// Represents the state of an H2 stream +/// +/// ```not_rust +/// +--------+ +/// send PP | | recv PP +/// ,--------| idle |--------. +/// / | | \ +/// v +--------+ v +/// +----------+ | +----------+ +/// | | | send H / | | +/// ,------| reserved | | recv H | reserved |------. +/// | | (local) | | | (remote) | | +/// | +----------+ v +----------+ | +/// | | +--------+ | | +/// | | recv ES | | send ES | | +/// | send H | ,-------| open |-------. | recv H | +/// | | / | | \ | | +/// | v v +--------+ v v | +/// | +----------+ | +----------+ | +/// | | half | | | half | | +/// | | closed | | send R / | closed | | +/// | | (remote) | | recv R | (local) | | +/// | +----------+ | +----------+ | +/// | | | | | +/// | | send ES / | recv ES / | | +/// | | send R / v send R / | | +/// | | recv R +--------+ recv R | | +/// | send R / `----------->| |<-----------' send R / | +/// | recv R | closed | recv R | +/// `----------------------->| |<----------------------' +/// +--------+ +/// +/// send: endpoint sends this frame +/// recv: endpoint receives this frame +/// +/// H: HEADERS frame (with implied CONTINUATIONs) +/// PP: PUSH_PROMISE frame (with implied CONTINUATIONs) +/// ES: END_STREAM flag +/// R: RST_STREAM frame +/// ``` +#[derive(Debug, Clone)] +pub struct State { + inner: Inner, +} + +#[derive(Debug, Clone)] +enum Inner { + Idle, + // TODO: these states shouldn't count against concurrency limits: + ReservedLocal, + ReservedRemote, + Open { local: Peer, remote: Peer }, + HalfClosedLocal(Peer), // TODO: explicitly name this value + HalfClosedRemote(Peer), + Closed(Cause), +} + +#[derive(Debug, Copy, Clone)] +enum Peer { + AwaitingHeaders, + Streaming, +} + +#[derive(Debug, Clone)] +enum Cause { + EndStream, + Error(Error), + + /// This indicates to the connection that a reset frame must be sent out + /// once the send queue has been flushed. + /// + /// Examples of when this could happen: + /// - User drops all references to a stream, so we want to CANCEL the it. + /// - Header block size was too large, so we want to REFUSE, possibly + /// after sending a 431 response frame. + ScheduledLibraryReset(Reason), +} + +impl State { + /// Opens the send-half of a stream if it is not already open. + pub fn send_open(&mut self, eos: bool) -> Result<(), UserError> { + let local = Streaming; + + self.inner = match self.inner { + Idle => { + if eos { + HalfClosedLocal(AwaitingHeaders) + } else { + Open { + local, + remote: AwaitingHeaders, + } + } + } + Open { + local: AwaitingHeaders, + remote, + } => { + if eos { + HalfClosedLocal(remote) + } else { + Open { local, remote } + } + } + HalfClosedRemote(AwaitingHeaders) | ReservedLocal => { + if eos { + Closed(Cause::EndStream) + } else { + HalfClosedRemote(local) + } + } + _ => { + // All other transitions result in a protocol error + return Err(UserError::UnexpectedFrameType); + } + }; + + Ok(()) + } + + /// Opens the receive-half of the stream when a HEADERS frame is received. + /// + /// Returns true if this transitions the state to Open. + pub fn recv_open(&mut self, frame: &frame::Headers) -> Result<bool, Error> { + let mut initial = false; + let eos = frame.is_end_stream(); + + self.inner = match self.inner { + Idle => { + initial = true; + + if eos { + HalfClosedRemote(AwaitingHeaders) + } else { + Open { + local: AwaitingHeaders, + remote: if frame.is_informational() { + tracing::trace!("skipping 1xx response headers"); + AwaitingHeaders + } else { + Streaming + }, + } + } + } + ReservedRemote => { + initial = true; + + if eos { + Closed(Cause::EndStream) + } else if frame.is_informational() { + tracing::trace!("skipping 1xx response headers"); + ReservedRemote + } else { + HalfClosedLocal(Streaming) + } + } + Open { + local, + remote: AwaitingHeaders, + } => { + if eos { + HalfClosedRemote(local) + } else { + Open { + local, + remote: if frame.is_informational() { + tracing::trace!("skipping 1xx response headers"); + AwaitingHeaders + } else { + Streaming + }, + } + } + } + HalfClosedLocal(AwaitingHeaders) => { + if eos { + Closed(Cause::EndStream) + } else if frame.is_informational() { + tracing::trace!("skipping 1xx response headers"); + HalfClosedLocal(AwaitingHeaders) + } else { + HalfClosedLocal(Streaming) + } + } + ref state => { + // All other transitions result in a protocol error + proto_err!(conn: "recv_open: in unexpected state {:?}", state); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + }; + + Ok(initial) + } + + /// Transition from Idle -> ReservedRemote + pub fn reserve_remote(&mut self) -> Result<(), Error> { + match self.inner { + Idle => { + self.inner = ReservedRemote; + Ok(()) + } + ref state => { + proto_err!(conn: "reserve_remote: in unexpected state {:?}", state); + Err(Error::library_go_away(Reason::PROTOCOL_ERROR)) + } + } + } + + /// Transition from Idle -> ReservedLocal + pub fn reserve_local(&mut self) -> Result<(), UserError> { + match self.inner { + Idle => { + self.inner = ReservedLocal; + Ok(()) + } + _ => Err(UserError::UnexpectedFrameType), + } + } + + /// Indicates that the remote side will not send more data to the local. + pub fn recv_close(&mut self) -> Result<(), Error> { + match self.inner { + Open { local, .. } => { + // The remote side will continue to receive data. + tracing::trace!("recv_close: Open => HalfClosedRemote({:?})", local); + self.inner = HalfClosedRemote(local); + Ok(()) + } + HalfClosedLocal(..) => { + tracing::trace!("recv_close: HalfClosedLocal => Closed"); + self.inner = Closed(Cause::EndStream); + Ok(()) + } + ref state => { + proto_err!(conn: "recv_close: in unexpected state {:?}", state); + Err(Error::library_go_away(Reason::PROTOCOL_ERROR)) + } + } + } + + /// The remote explicitly sent a RST_STREAM. + /// + /// # Arguments + /// - `frame`: the received RST_STREAM frame. + /// - `queued`: true if this stream has frames in the pending send queue. + pub fn recv_reset(&mut self, frame: frame::Reset, queued: bool) { + match self.inner { + // If the stream is already in a `Closed` state, do nothing, + // provided that there are no frames still in the send queue. + Closed(..) if !queued => {} + // A notionally `Closed` stream may still have queued frames in + // the following cases: + // + // - if the cause is `Cause::Scheduled(..)` (i.e. we have not + // actually closed the stream yet). + // - if the cause is `Cause::EndStream`: we transition to this + // state when an EOS frame is *enqueued* (so that it's invalid + // to enqueue more frames), not when the EOS frame is *sent*; + // therefore, there may still be frames ahead of the EOS frame + // in the send queue. + // + // In either of these cases, we want to overwrite the stream's + // previous state with the received RST_STREAM, so that the queue + // will be cleared by `Prioritize::pop_frame`. + ref state => { + tracing::trace!( + "recv_reset; frame={:?}; state={:?}; queued={:?}", + frame, + state, + queued + ); + self.inner = Closed(Cause::Error(Error::remote_reset( + frame.stream_id(), + frame.reason(), + ))); + } + } + } + + /// Handle a connection-level error. + pub fn handle_error(&mut self, err: &proto::Error) { + match self.inner { + Closed(..) => {} + _ => { + tracing::trace!("handle_error; err={:?}", err); + self.inner = Closed(Cause::Error(err.clone())); + } + } + } + + pub fn recv_eof(&mut self) { + match self.inner { + Closed(..) => {} + ref state => { + tracing::trace!("recv_eof; state={:?}", state); + self.inner = Closed(Cause::Error(io::ErrorKind::BrokenPipe.into())); + } + } + } + + /// Indicates that the local side will not send more data to the local. + pub fn send_close(&mut self) { + match self.inner { + Open { remote, .. } => { + // The remote side will continue to receive data. + tracing::trace!("send_close: Open => HalfClosedLocal({:?})", remote); + self.inner = HalfClosedLocal(remote); + } + HalfClosedRemote(..) => { + tracing::trace!("send_close: HalfClosedRemote => Closed"); + self.inner = Closed(Cause::EndStream); + } + ref state => panic!("send_close: unexpected state {:?}", state), + } + } + + /// Set the stream state to reset locally. + pub fn set_reset(&mut self, stream_id: StreamId, reason: Reason, initiator: Initiator) { + self.inner = Closed(Cause::Error(Error::Reset(stream_id, reason, initiator))); + } + + /// Set the stream state to a scheduled reset. + pub fn set_scheduled_reset(&mut self, reason: Reason) { + debug_assert!(!self.is_closed()); + self.inner = Closed(Cause::ScheduledLibraryReset(reason)); + } + + pub fn get_scheduled_reset(&self) -> Option<Reason> { + match self.inner { + Closed(Cause::ScheduledLibraryReset(reason)) => Some(reason), + _ => None, + } + } + + pub fn is_scheduled_reset(&self) -> bool { + match self.inner { + Closed(Cause::ScheduledLibraryReset(..)) => true, + _ => false, + } + } + + pub fn is_local_reset(&self) -> bool { + match self.inner { + Closed(Cause::Error(ref e)) => e.is_local(), + Closed(Cause::ScheduledLibraryReset(..)) => true, + _ => false, + } + } + + /// Returns true if the stream is already reset. + pub fn is_reset(&self) -> bool { + match self.inner { + Closed(Cause::EndStream) => false, + Closed(_) => true, + _ => false, + } + } + + pub fn is_send_streaming(&self) -> bool { + match self.inner { + Open { + local: Streaming, .. + } => true, + HalfClosedRemote(Streaming) => true, + _ => false, + } + } + + /// Returns true when the stream is in a state to receive headers + pub fn is_recv_headers(&self) -> bool { + match self.inner { + Idle => true, + Open { + remote: AwaitingHeaders, + .. + } => true, + HalfClosedLocal(AwaitingHeaders) => true, + ReservedRemote => true, + _ => false, + } + } + + pub fn is_recv_streaming(&self) -> bool { + match self.inner { + Open { + remote: Streaming, .. + } => true, + HalfClosedLocal(Streaming) => true, + _ => false, + } + } + + pub fn is_closed(&self) -> bool { + match self.inner { + Closed(_) => true, + _ => false, + } + } + + pub fn is_recv_closed(&self) -> bool { + match self.inner { + Closed(..) | HalfClosedRemote(..) | ReservedLocal => true, + _ => false, + } + } + + pub fn is_send_closed(&self) -> bool { + match self.inner { + Closed(..) | HalfClosedLocal(..) | ReservedRemote => true, + _ => false, + } + } + + pub fn is_idle(&self) -> bool { + match self.inner { + Idle => true, + _ => false, + } + } + + pub fn ensure_recv_open(&self) -> Result<bool, proto::Error> { + // TODO: Is this correct? + match self.inner { + Closed(Cause::Error(ref e)) => Err(e.clone()), + Closed(Cause::ScheduledLibraryReset(reason)) => { + Err(proto::Error::library_go_away(reason)) + } + Closed(Cause::EndStream) | HalfClosedRemote(..) | ReservedLocal => Ok(false), + _ => Ok(true), + } + } + + /// Returns a reason if the stream has been reset. + pub(super) fn ensure_reason(&self, mode: PollReset) -> Result<Option<Reason>, crate::Error> { + match self.inner { + Closed(Cause::Error(Error::Reset(_, reason, _))) + | Closed(Cause::Error(Error::GoAway(_, reason, _))) + | Closed(Cause::ScheduledLibraryReset(reason)) => Ok(Some(reason)), + Closed(Cause::Error(ref e)) => Err(e.clone().into()), + Open { + local: Streaming, .. + } + | HalfClosedRemote(Streaming) => match mode { + PollReset::AwaitingHeaders => Err(UserError::PollResetAfterSendResponse.into()), + PollReset::Streaming => Ok(None), + }, + _ => Ok(None), + } + } +} + +impl Default for State { + fn default() -> State { + State { inner: Inner::Idle } + } +} + +impl Default for Peer { + fn default() -> Self { + AwaitingHeaders + } +} diff --git a/third_party/rust/h2/src/proto/streams/store.rs b/third_party/rust/h2/src/proto/streams/store.rs new file mode 100644 index 0000000000..3e34b7cb29 --- /dev/null +++ b/third_party/rust/h2/src/proto/streams/store.rs @@ -0,0 +1,426 @@ +use super::*; + +use slab; + +use indexmap::{self, IndexMap}; + +use std::convert::Infallible; +use std::fmt; +use std::marker::PhantomData; +use std::ops; + +/// Storage for streams +#[derive(Debug)] +pub(super) struct Store { + slab: slab::Slab<Stream>, + ids: IndexMap<StreamId, SlabIndex>, +} + +/// "Pointer" to an entry in the store +pub(super) struct Ptr<'a> { + key: Key, + store: &'a mut Store, +} + +/// References an entry in the store. +#[derive(Debug, Clone, Copy, PartialEq, Eq)] +pub(crate) struct Key { + index: SlabIndex, + /// Keep the stream ID in the key as an ABA guard, since slab indices + /// could be re-used with a new stream. + stream_id: StreamId, +} + +// We can never have more than `StreamId::MAX` streams in the store, +// so we can save a smaller index (u32 vs usize). +#[derive(Debug, Clone, Copy, PartialEq, Eq)] +struct SlabIndex(u32); + +#[derive(Debug)] +pub(super) struct Queue<N> { + indices: Option<store::Indices>, + _p: PhantomData<N>, +} + +pub(super) trait Next { + fn next(stream: &Stream) -> Option<Key>; + + fn set_next(stream: &mut Stream, key: Option<Key>); + + fn take_next(stream: &mut Stream) -> Option<Key>; + + fn is_queued(stream: &Stream) -> bool; + + fn set_queued(stream: &mut Stream, val: bool); +} + +/// A linked list +#[derive(Debug, Clone, Copy)] +struct Indices { + pub head: Key, + pub tail: Key, +} + +pub(super) enum Entry<'a> { + Occupied(OccupiedEntry<'a>), + Vacant(VacantEntry<'a>), +} + +pub(super) struct OccupiedEntry<'a> { + ids: indexmap::map::OccupiedEntry<'a, StreamId, SlabIndex>, +} + +pub(super) struct VacantEntry<'a> { + ids: indexmap::map::VacantEntry<'a, StreamId, SlabIndex>, + slab: &'a mut slab::Slab<Stream>, +} + +pub(super) trait Resolve { + fn resolve(&mut self, key: Key) -> Ptr; +} + +// ===== impl Store ===== + +impl Store { + pub fn new() -> Self { + Store { + slab: slab::Slab::new(), + ids: IndexMap::new(), + } + } + + pub fn find_mut(&mut self, id: &StreamId) -> Option<Ptr> { + let index = match self.ids.get(id) { + Some(key) => *key, + None => return None, + }; + + Some(Ptr { + key: Key { + index, + stream_id: *id, + }, + store: self, + }) + } + + pub fn insert(&mut self, id: StreamId, val: Stream) -> Ptr { + let index = SlabIndex(self.slab.insert(val) as u32); + assert!(self.ids.insert(id, index).is_none()); + + Ptr { + key: Key { + index, + stream_id: id, + }, + store: self, + } + } + + pub fn find_entry(&mut self, id: StreamId) -> Entry { + use self::indexmap::map::Entry::*; + + match self.ids.entry(id) { + Occupied(e) => Entry::Occupied(OccupiedEntry { ids: e }), + Vacant(e) => Entry::Vacant(VacantEntry { + ids: e, + slab: &mut self.slab, + }), + } + } + + pub(crate) fn for_each<F>(&mut self, mut f: F) + where + F: FnMut(Ptr), + { + match self.try_for_each(|ptr| { + f(ptr); + Ok::<_, Infallible>(()) + }) { + Ok(()) => (), + Err(infallible) => match infallible {}, + } + } + + pub fn try_for_each<F, E>(&mut self, mut f: F) -> Result<(), E> + where + F: FnMut(Ptr) -> Result<(), E>, + { + let mut len = self.ids.len(); + let mut i = 0; + + while i < len { + // Get the key by index, this makes the borrow checker happy + let (stream_id, index) = { + let entry = self.ids.get_index(i).unwrap(); + (*entry.0, *entry.1) + }; + + f(Ptr { + key: Key { index, stream_id }, + store: self, + })?; + + // TODO: This logic probably could be better... + let new_len = self.ids.len(); + + if new_len < len { + debug_assert!(new_len == len - 1); + len -= 1; + } else { + i += 1; + } + } + + Ok(()) + } +} + +impl Resolve for Store { + fn resolve(&mut self, key: Key) -> Ptr { + Ptr { key, store: self } + } +} + +impl ops::Index<Key> for Store { + type Output = Stream; + + fn index(&self, key: Key) -> &Self::Output { + self.slab + .get(key.index.0 as usize) + .filter(|s| s.id == key.stream_id) + .unwrap_or_else(|| { + panic!("dangling store key for stream_id={:?}", key.stream_id); + }) + } +} + +impl ops::IndexMut<Key> for Store { + fn index_mut(&mut self, key: Key) -> &mut Self::Output { + self.slab + .get_mut(key.index.0 as usize) + .filter(|s| s.id == key.stream_id) + .unwrap_or_else(|| { + panic!("dangling store key for stream_id={:?}", key.stream_id); + }) + } +} + +impl Store { + #[cfg(feature = "unstable")] + pub fn num_active_streams(&self) -> usize { + self.ids.len() + } + + #[cfg(feature = "unstable")] + pub fn num_wired_streams(&self) -> usize { + self.slab.len() + } +} + +// While running h2 unit/integration tests, enable this debug assertion. +// +// In practice, we don't need to ensure this. But the integration tests +// help to make sure we've cleaned up in cases where we could (like, the +// runtime isn't suddenly dropping the task for unknown reasons). +#[cfg(feature = "unstable")] +impl Drop for Store { + fn drop(&mut self) { + use std::thread; + + if !thread::panicking() { + debug_assert!(self.slab.is_empty()); + } + } +} + +// ===== impl Queue ===== + +impl<N> Queue<N> +where + N: Next, +{ + pub fn new() -> Self { + Queue { + indices: None, + _p: PhantomData, + } + } + + pub fn take(&mut self) -> Self { + Queue { + indices: self.indices.take(), + _p: PhantomData, + } + } + + /// Queue the stream. + /// + /// If the stream is already contained by the list, return `false`. + pub fn push(&mut self, stream: &mut store::Ptr) -> bool { + tracing::trace!("Queue::push"); + + if N::is_queued(stream) { + tracing::trace!(" -> already queued"); + return false; + } + + N::set_queued(stream, true); + + // The next pointer shouldn't be set + debug_assert!(N::next(stream).is_none()); + + // Queue the stream + match self.indices { + Some(ref mut idxs) => { + tracing::trace!(" -> existing entries"); + + // Update the current tail node to point to `stream` + let key = stream.key(); + N::set_next(&mut stream.resolve(idxs.tail), Some(key)); + + // Update the tail pointer + idxs.tail = stream.key(); + } + None => { + tracing::trace!(" -> first entry"); + self.indices = Some(store::Indices { + head: stream.key(), + tail: stream.key(), + }); + } + } + + true + } + + pub fn pop<'a, R>(&mut self, store: &'a mut R) -> Option<store::Ptr<'a>> + where + R: Resolve, + { + if let Some(mut idxs) = self.indices { + let mut stream = store.resolve(idxs.head); + + if idxs.head == idxs.tail { + assert!(N::next(&*stream).is_none()); + self.indices = None; + } else { + idxs.head = N::take_next(&mut *stream).unwrap(); + self.indices = Some(idxs); + } + + debug_assert!(N::is_queued(&*stream)); + N::set_queued(&mut *stream, false); + + return Some(stream); + } + + None + } + + pub fn is_empty(&self) -> bool { + self.indices.is_none() + } + + pub fn pop_if<'a, R, F>(&mut self, store: &'a mut R, f: F) -> Option<store::Ptr<'a>> + where + R: Resolve, + F: Fn(&Stream) -> bool, + { + if let Some(idxs) = self.indices { + let should_pop = f(&store.resolve(idxs.head)); + if should_pop { + return self.pop(store); + } + } + + None + } +} + +// ===== impl Ptr ===== + +impl<'a> Ptr<'a> { + /// Returns the Key associated with the stream + pub fn key(&self) -> Key { + self.key + } + + pub fn store_mut(&mut self) -> &mut Store { + &mut self.store + } + + /// Remove the stream from the store + pub fn remove(self) -> StreamId { + // The stream must have been unlinked before this point + debug_assert!(!self.store.ids.contains_key(&self.key.stream_id)); + + // Remove the stream state + let stream = self.store.slab.remove(self.key.index.0 as usize); + assert_eq!(stream.id, self.key.stream_id); + stream.id + } + + /// Remove the StreamId -> stream state association. + /// + /// This will effectively remove the stream as far as the H2 protocol is + /// concerned. + pub fn unlink(&mut self) { + let id = self.key.stream_id; + self.store.ids.swap_remove(&id); + } +} + +impl<'a> Resolve for Ptr<'a> { + fn resolve(&mut self, key: Key) -> Ptr { + Ptr { + key, + store: &mut *self.store, + } + } +} + +impl<'a> ops::Deref for Ptr<'a> { + type Target = Stream; + + fn deref(&self) -> &Stream { + &self.store[self.key] + } +} + +impl<'a> ops::DerefMut for Ptr<'a> { + fn deref_mut(&mut self) -> &mut Stream { + &mut self.store[self.key] + } +} + +impl<'a> fmt::Debug for Ptr<'a> { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + (**self).fmt(fmt) + } +} + +// ===== impl OccupiedEntry ===== + +impl<'a> OccupiedEntry<'a> { + pub fn key(&self) -> Key { + let stream_id = *self.ids.key(); + let index = *self.ids.get(); + Key { index, stream_id } + } +} + +// ===== impl VacantEntry ===== + +impl<'a> VacantEntry<'a> { + pub fn insert(self, value: Stream) -> Key { + // Insert the value in the slab + let stream_id = value.id; + let index = SlabIndex(self.slab.insert(value) as u32); + + // Insert the handle in the ID map + self.ids.insert(index); + + Key { index, stream_id } + } +} diff --git a/third_party/rust/h2/src/proto/streams/stream.rs b/third_party/rust/h2/src/proto/streams/stream.rs new file mode 100644 index 0000000000..36d515bad2 --- /dev/null +++ b/third_party/rust/h2/src/proto/streams/stream.rs @@ -0,0 +1,490 @@ +use super::*; + +use std::task::{Context, Waker}; +use std::time::Instant; +use std::usize; + +/// Tracks Stream related state +/// +/// # Reference counting +/// +/// There can be a number of outstanding handles to a single Stream. These are +/// tracked using reference counting. The `ref_count` field represents the +/// number of outstanding userspace handles that can reach this stream. +/// +/// It's important to note that when the stream is placed in an internal queue +/// (such as an accept queue), this is **not** tracked by a reference count. +/// Thus, `ref_count` can be zero and the stream still has to be kept around. +#[derive(Debug)] +pub(super) struct Stream { + /// The h2 stream identifier + pub id: StreamId, + + /// Current state of the stream + pub state: State, + + /// Set to `true` when the stream is counted against the connection's max + /// concurrent streams. + pub is_counted: bool, + + /// Number of outstanding handles pointing to this stream + pub ref_count: usize, + + // ===== Fields related to sending ===== + /// Next node in the accept linked list + pub next_pending_send: Option<store::Key>, + + /// Set to true when the stream is pending accept + pub is_pending_send: bool, + + /// Send data flow control + pub send_flow: FlowControl, + + /// Amount of send capacity that has been requested, but not yet allocated. + pub requested_send_capacity: WindowSize, + + /// Amount of data buffered at the prioritization layer. + /// TODO: Technically this could be greater than the window size... + pub buffered_send_data: usize, + + /// Task tracking additional send capacity (i.e. window updates). + send_task: Option<Waker>, + + /// Frames pending for this stream being sent to the socket + pub pending_send: buffer::Deque, + + /// Next node in the linked list of streams waiting for additional + /// connection level capacity. + pub next_pending_send_capacity: Option<store::Key>, + + /// True if the stream is waiting for outbound connection capacity + pub is_pending_send_capacity: bool, + + /// Set to true when the send capacity has been incremented + pub send_capacity_inc: bool, + + /// Next node in the open linked list + pub next_open: Option<store::Key>, + + /// Set to true when the stream is pending to be opened + pub is_pending_open: bool, + + /// Set to true when a push is pending for this stream + pub is_pending_push: bool, + + // ===== Fields related to receiving ===== + /// Next node in the accept linked list + pub next_pending_accept: Option<store::Key>, + + /// Set to true when the stream is pending accept + pub is_pending_accept: bool, + + /// Receive data flow control + pub recv_flow: FlowControl, + + pub in_flight_recv_data: WindowSize, + + /// Next node in the linked list of streams waiting to send window updates. + pub next_window_update: Option<store::Key>, + + /// True if the stream is waiting to send a window update + pub is_pending_window_update: bool, + + /// The time when this stream may have been locally reset. + pub reset_at: Option<Instant>, + + /// Next node in list of reset streams that should expire eventually + pub next_reset_expire: Option<store::Key>, + + /// Frames pending for this stream to read + pub pending_recv: buffer::Deque, + + /// Task tracking receiving frames + pub recv_task: Option<Waker>, + + /// The stream's pending push promises + pub pending_push_promises: store::Queue<NextAccept>, + + /// Validate content-length headers + pub content_length: ContentLength, +} + +/// State related to validating a stream's content-length +#[derive(Debug)] +pub enum ContentLength { + Omitted, + Head, + Remaining(u64), +} + +#[derive(Debug)] +pub(super) struct NextAccept; + +#[derive(Debug)] +pub(super) struct NextSend; + +#[derive(Debug)] +pub(super) struct NextSendCapacity; + +#[derive(Debug)] +pub(super) struct NextWindowUpdate; + +#[derive(Debug)] +pub(super) struct NextOpen; + +#[derive(Debug)] +pub(super) struct NextResetExpire; + +impl Stream { + pub fn new(id: StreamId, init_send_window: WindowSize, init_recv_window: WindowSize) -> Stream { + let mut send_flow = FlowControl::new(); + let mut recv_flow = FlowControl::new(); + + recv_flow + .inc_window(init_recv_window) + .expect("invalid initial receive window"); + recv_flow.assign_capacity(init_recv_window); + + send_flow + .inc_window(init_send_window) + .expect("invalid initial send window size"); + + Stream { + id, + state: State::default(), + ref_count: 0, + is_counted: false, + + // ===== Fields related to sending ===== + next_pending_send: None, + is_pending_send: false, + send_flow, + requested_send_capacity: 0, + buffered_send_data: 0, + send_task: None, + pending_send: buffer::Deque::new(), + is_pending_send_capacity: false, + next_pending_send_capacity: None, + send_capacity_inc: false, + is_pending_open: false, + next_open: None, + is_pending_push: false, + + // ===== Fields related to receiving ===== + next_pending_accept: None, + is_pending_accept: false, + recv_flow, + in_flight_recv_data: 0, + next_window_update: None, + is_pending_window_update: false, + reset_at: None, + next_reset_expire: None, + pending_recv: buffer::Deque::new(), + recv_task: None, + pending_push_promises: store::Queue::new(), + content_length: ContentLength::Omitted, + } + } + + /// Increment the stream's ref count + pub fn ref_inc(&mut self) { + assert!(self.ref_count < usize::MAX); + self.ref_count += 1; + } + + /// Decrements the stream's ref count + pub fn ref_dec(&mut self) { + assert!(self.ref_count > 0); + self.ref_count -= 1; + } + + /// Returns true if stream is currently being held for some time because of + /// a local reset. + pub fn is_pending_reset_expiration(&self) -> bool { + self.reset_at.is_some() + } + + /// Returns true if frames for this stream are ready to be sent over the wire + pub fn is_send_ready(&self) -> bool { + // Why do we check pending_open? + // + // We allow users to call send_request() which schedules a stream to be pending_open + // if there is no room according to the concurrency limit (max_send_streams), and we + // also allow data to be buffered for send with send_data() if there is no capacity for + // the stream to send the data, which attempts to place the stream in pending_send. + // If the stream is not open, we don't want the stream to be scheduled for + // execution (pending_send). Note that if the stream is in pending_open, it will be + // pushed to pending_send when there is room for an open stream. + // + // In pending_push we track whether a PushPromise still needs to be sent + // from a different stream before we can start sending frames on this one. + // This is different from the "open" check because reserved streams don't count + // toward the concurrency limit. + // See https://httpwg.org/specs/rfc7540.html#rfc.section.5.1.2 + !self.is_pending_open && !self.is_pending_push + } + + /// Returns true if the stream is closed + pub fn is_closed(&self) -> bool { + // The state has fully transitioned to closed. + self.state.is_closed() && + // Because outbound frames transition the stream state before being + // buffered, we have to ensure that all frames have been flushed. + self.pending_send.is_empty() && + // Sometimes large data frames are sent out in chunks. After a chunk + // of the frame is sent, the remainder is pushed back onto the send + // queue to be rescheduled. + // + // Checking for additional buffered data lets us catch this case. + self.buffered_send_data == 0 + } + + /// Returns true if the stream is no longer in use + pub fn is_released(&self) -> bool { + // The stream is closed and fully flushed + self.is_closed() && + // There are no more outstanding references to the stream + self.ref_count == 0 && + // The stream is not in any queue + !self.is_pending_send && !self.is_pending_send_capacity && + !self.is_pending_accept && !self.is_pending_window_update && + !self.is_pending_open && !self.reset_at.is_some() + } + + /// Returns true when the consumer of the stream has dropped all handles + /// (indicating no further interest in the stream) and the stream state is + /// not actually closed. + /// + /// In this case, a reset should be sent. + pub fn is_canceled_interest(&self) -> bool { + self.ref_count == 0 && !self.state.is_closed() + } + + pub fn assign_capacity(&mut self, capacity: WindowSize, max_buffer_size: usize) { + debug_assert!(capacity > 0); + self.send_flow.assign_capacity(capacity); + + tracing::trace!( + " assigned capacity to stream; available={}; buffered={}; id={:?}; max_buffer_size={}", + self.send_flow.available(), + self.buffered_send_data, + self.id, + max_buffer_size + ); + + self.notify_if_can_buffer_more(max_buffer_size); + } + + /// If the capacity was limited because of the max_send_buffer_size, + /// then consider waking the send task again... + pub fn notify_if_can_buffer_more(&mut self, max_buffer_size: usize) { + let available = self.send_flow.available().as_size() as usize; + let buffered = self.buffered_send_data; + + // Only notify if the capacity exceeds the amount of buffered data + if available.min(max_buffer_size) > buffered { + self.send_capacity_inc = true; + tracing::trace!(" notifying task"); + self.notify_send(); + } + } + + /// Returns `Err` when the decrement cannot be completed due to overflow. + pub fn dec_content_length(&mut self, len: usize) -> Result<(), ()> { + match self.content_length { + ContentLength::Remaining(ref mut rem) => match rem.checked_sub(len as u64) { + Some(val) => *rem = val, + None => return Err(()), + }, + ContentLength::Head => { + if len != 0 { + return Err(()); + } + } + _ => {} + } + + Ok(()) + } + + pub fn ensure_content_length_zero(&self) -> Result<(), ()> { + match self.content_length { + ContentLength::Remaining(0) => Ok(()), + ContentLength::Remaining(_) => Err(()), + _ => Ok(()), + } + } + + pub fn notify_send(&mut self) { + if let Some(task) = self.send_task.take() { + task.wake(); + } + } + + pub fn wait_send(&mut self, cx: &Context) { + self.send_task = Some(cx.waker().clone()); + } + + pub fn notify_recv(&mut self) { + if let Some(task) = self.recv_task.take() { + task.wake(); + } + } +} + +impl store::Next for NextAccept { + fn next(stream: &Stream) -> Option<store::Key> { + stream.next_pending_accept + } + + fn set_next(stream: &mut Stream, key: Option<store::Key>) { + stream.next_pending_accept = key; + } + + fn take_next(stream: &mut Stream) -> Option<store::Key> { + stream.next_pending_accept.take() + } + + fn is_queued(stream: &Stream) -> bool { + stream.is_pending_accept + } + + fn set_queued(stream: &mut Stream, val: bool) { + stream.is_pending_accept = val; + } +} + +impl store::Next for NextSend { + fn next(stream: &Stream) -> Option<store::Key> { + stream.next_pending_send + } + + fn set_next(stream: &mut Stream, key: Option<store::Key>) { + stream.next_pending_send = key; + } + + fn take_next(stream: &mut Stream) -> Option<store::Key> { + stream.next_pending_send.take() + } + + fn is_queued(stream: &Stream) -> bool { + stream.is_pending_send + } + + fn set_queued(stream: &mut Stream, val: bool) { + if val { + // ensure that stream is not queued for being opened + // if it's being put into queue for sending data + debug_assert_eq!(stream.is_pending_open, false); + } + stream.is_pending_send = val; + } +} + +impl store::Next for NextSendCapacity { + fn next(stream: &Stream) -> Option<store::Key> { + stream.next_pending_send_capacity + } + + fn set_next(stream: &mut Stream, key: Option<store::Key>) { + stream.next_pending_send_capacity = key; + } + + fn take_next(stream: &mut Stream) -> Option<store::Key> { + stream.next_pending_send_capacity.take() + } + + fn is_queued(stream: &Stream) -> bool { + stream.is_pending_send_capacity + } + + fn set_queued(stream: &mut Stream, val: bool) { + stream.is_pending_send_capacity = val; + } +} + +impl store::Next for NextWindowUpdate { + fn next(stream: &Stream) -> Option<store::Key> { + stream.next_window_update + } + + fn set_next(stream: &mut Stream, key: Option<store::Key>) { + stream.next_window_update = key; + } + + fn take_next(stream: &mut Stream) -> Option<store::Key> { + stream.next_window_update.take() + } + + fn is_queued(stream: &Stream) -> bool { + stream.is_pending_window_update + } + + fn set_queued(stream: &mut Stream, val: bool) { + stream.is_pending_window_update = val; + } +} + +impl store::Next for NextOpen { + fn next(stream: &Stream) -> Option<store::Key> { + stream.next_open + } + + fn set_next(stream: &mut Stream, key: Option<store::Key>) { + stream.next_open = key; + } + + fn take_next(stream: &mut Stream) -> Option<store::Key> { + stream.next_open.take() + } + + fn is_queued(stream: &Stream) -> bool { + stream.is_pending_open + } + + fn set_queued(stream: &mut Stream, val: bool) { + if val { + // ensure that stream is not queued for being sent + // if it's being put into queue for opening the stream + debug_assert_eq!(stream.is_pending_send, false); + } + stream.is_pending_open = val; + } +} + +impl store::Next for NextResetExpire { + fn next(stream: &Stream) -> Option<store::Key> { + stream.next_reset_expire + } + + fn set_next(stream: &mut Stream, key: Option<store::Key>) { + stream.next_reset_expire = key; + } + + fn take_next(stream: &mut Stream) -> Option<store::Key> { + stream.next_reset_expire.take() + } + + fn is_queued(stream: &Stream) -> bool { + stream.reset_at.is_some() + } + + fn set_queued(stream: &mut Stream, val: bool) { + if val { + stream.reset_at = Some(Instant::now()); + } else { + stream.reset_at = None; + } + } +} + +// ===== impl ContentLength ===== + +impl ContentLength { + pub fn is_head(&self) -> bool { + match *self { + ContentLength::Head => true, + _ => false, + } + } +} diff --git a/third_party/rust/h2/src/proto/streams/streams.rs b/third_party/rust/h2/src/proto/streams/streams.rs new file mode 100644 index 0000000000..aee64ca6a3 --- /dev/null +++ b/third_party/rust/h2/src/proto/streams/streams.rs @@ -0,0 +1,1576 @@ +use super::recv::RecvHeaderBlockError; +use super::store::{self, Entry, Resolve, Store}; +use super::{Buffer, Config, Counts, Prioritized, Recv, Send, Stream, StreamId}; +use crate::codec::{Codec, SendError, UserError}; +use crate::ext::Protocol; +use crate::frame::{self, Frame, Reason}; +use crate::proto::{peer, Error, Initiator, Open, Peer, WindowSize}; +use crate::{client, proto, server}; + +use bytes::{Buf, Bytes}; +use http::{HeaderMap, Request, Response}; +use std::task::{Context, Poll, Waker}; +use tokio::io::AsyncWrite; + +use std::sync::{Arc, Mutex}; +use std::{fmt, io}; + +#[derive(Debug)] +pub(crate) struct Streams<B, P> +where + P: Peer, +{ + /// Holds most of the connection and stream related state for processing + /// HTTP/2 frames associated with streams. + inner: Arc<Mutex<Inner>>, + + /// This is the queue of frames to be written to the wire. This is split out + /// to avoid requiring a `B` generic on all public API types even if `B` is + /// not technically required. + /// + /// Currently, splitting this out requires a second `Arc` + `Mutex`. + /// However, it should be possible to avoid this duplication with a little + /// bit of unsafe code. This optimization has been postponed until it has + /// been shown to be necessary. + send_buffer: Arc<SendBuffer<B>>, + + _p: ::std::marker::PhantomData<P>, +} + +// Like `Streams` but with a `peer::Dyn` field instead of a static `P: Peer` type parameter. +// Ensures that the methods only get one instantiation, instead of two (client and server) +#[derive(Debug)] +pub(crate) struct DynStreams<'a, B> { + inner: &'a Mutex<Inner>, + + send_buffer: &'a SendBuffer<B>, + + peer: peer::Dyn, +} + +/// Reference to the stream state +#[derive(Debug)] +pub(crate) struct StreamRef<B> { + opaque: OpaqueStreamRef, + send_buffer: Arc<SendBuffer<B>>, +} + +/// Reference to the stream state that hides the send data chunk generic +pub(crate) struct OpaqueStreamRef { + inner: Arc<Mutex<Inner>>, + key: store::Key, +} + +/// Fields needed to manage state related to managing the set of streams. This +/// is mostly split out to make ownership happy. +/// +/// TODO: better name +#[derive(Debug)] +struct Inner { + /// Tracks send & recv stream concurrency. + counts: Counts, + + /// Connection level state and performs actions on streams + actions: Actions, + + /// Stores stream state + store: Store, + + /// The number of stream refs to this shared state. + refs: usize, +} + +#[derive(Debug)] +struct Actions { + /// Manages state transitions initiated by receiving frames + recv: Recv, + + /// Manages state transitions initiated by sending frames + send: Send, + + /// Task that calls `poll_complete`. + task: Option<Waker>, + + /// If the connection errors, a copy is kept for any StreamRefs. + conn_error: Option<proto::Error>, +} + +/// Contains the buffer of frames to be written to the wire. +#[derive(Debug)] +struct SendBuffer<B> { + inner: Mutex<Buffer<Frame<B>>>, +} + +// ===== impl Streams ===== + +impl<B, P> Streams<B, P> +where + B: Buf, + P: Peer, +{ + pub fn new(config: Config) -> Self { + let peer = P::r#dyn(); + + Streams { + inner: Inner::new(peer, config), + send_buffer: Arc::new(SendBuffer::new()), + _p: ::std::marker::PhantomData, + } + } + + pub fn set_target_connection_window_size(&mut self, size: WindowSize) { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + me.actions + .recv + .set_target_connection_window(size, &mut me.actions.task) + } + + pub fn next_incoming(&mut self) -> Option<StreamRef<B>> { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + me.actions.recv.next_incoming(&mut me.store).map(|key| { + let stream = &mut me.store.resolve(key); + tracing::trace!( + "next_incoming; id={:?}, state={:?}", + stream.id, + stream.state + ); + // TODO: ideally, OpaqueStreamRefs::new would do this, but we're holding + // the lock, so it can't. + me.refs += 1; + StreamRef { + opaque: OpaqueStreamRef::new(self.inner.clone(), stream), + send_buffer: self.send_buffer.clone(), + } + }) + } + + pub fn send_pending_refusal<T>( + &mut self, + cx: &mut Context, + dst: &mut Codec<T, Prioritized<B>>, + ) -> Poll<io::Result<()>> + where + T: AsyncWrite + Unpin, + { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + me.actions.recv.send_pending_refusal(cx, dst) + } + + pub fn clear_expired_reset_streams(&mut self) { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + me.actions + .recv + .clear_expired_reset_streams(&mut me.store, &mut me.counts); + } + + pub fn poll_complete<T>( + &mut self, + cx: &mut Context, + dst: &mut Codec<T, Prioritized<B>>, + ) -> Poll<io::Result<()>> + where + T: AsyncWrite + Unpin, + { + let mut me = self.inner.lock().unwrap(); + me.poll_complete(&self.send_buffer, cx, dst) + } + + pub fn apply_remote_settings(&mut self, frame: &frame::Settings) -> Result<(), Error> { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + let mut send_buffer = self.send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + me.counts.apply_remote_settings(frame); + + me.actions.send.apply_remote_settings( + frame, + send_buffer, + &mut me.store, + &mut me.counts, + &mut me.actions.task, + ) + } + + pub fn apply_local_settings(&mut self, frame: &frame::Settings) -> Result<(), Error> { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + me.actions.recv.apply_local_settings(frame, &mut me.store) + } + + pub fn send_request( + &mut self, + mut request: Request<()>, + end_of_stream: bool, + pending: Option<&OpaqueStreamRef>, + ) -> Result<StreamRef<B>, SendError> { + use super::stream::ContentLength; + use http::Method; + + let protocol = request.extensions_mut().remove::<Protocol>(); + + // Clear before taking lock, incase extensions contain a StreamRef. + request.extensions_mut().clear(); + + // TODO: There is a hazard with assigning a stream ID before the + // prioritize layer. If prioritization reorders new streams, this + // implicitly closes the earlier stream IDs. + // + // See: hyperium/h2#11 + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + let mut send_buffer = self.send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + me.actions.ensure_no_conn_error()?; + me.actions.send.ensure_next_stream_id()?; + + // The `pending` argument is provided by the `Client`, and holds + // a store `Key` of a `Stream` that may have been not been opened + // yet. + // + // If that stream is still pending, the Client isn't allowed to + // queue up another pending stream. They should use `poll_ready`. + if let Some(stream) = pending { + if me.store.resolve(stream.key).is_pending_open { + return Err(UserError::Rejected.into()); + } + } + + if me.counts.peer().is_server() { + // Servers cannot open streams. PushPromise must first be reserved. + return Err(UserError::UnexpectedFrameType.into()); + } + + let stream_id = me.actions.send.open()?; + + let mut stream = Stream::new( + stream_id, + me.actions.send.init_window_sz(), + me.actions.recv.init_window_sz(), + ); + + if *request.method() == Method::HEAD { + stream.content_length = ContentLength::Head; + } + + // Convert the message + let headers = + client::Peer::convert_send_message(stream_id, request, protocol, end_of_stream)?; + + let mut stream = me.store.insert(stream.id, stream); + + let sent = me.actions.send.send_headers( + headers, + send_buffer, + &mut stream, + &mut me.counts, + &mut me.actions.task, + ); + + // send_headers can return a UserError, if it does, + // we should forget about this stream. + if let Err(err) = sent { + stream.unlink(); + stream.remove(); + return Err(err.into()); + } + + // Given that the stream has been initialized, it should not be in the + // closed state. + debug_assert!(!stream.state.is_closed()); + + // TODO: ideally, OpaqueStreamRefs::new would do this, but we're holding + // the lock, so it can't. + me.refs += 1; + + Ok(StreamRef { + opaque: OpaqueStreamRef::new(self.inner.clone(), &mut stream), + send_buffer: self.send_buffer.clone(), + }) + } + + pub(crate) fn is_extended_connect_protocol_enabled(&self) -> bool { + self.inner + .lock() + .unwrap() + .actions + .send + .is_extended_connect_protocol_enabled() + } +} + +impl<B> DynStreams<'_, B> { + pub fn recv_headers(&mut self, frame: frame::Headers) -> Result<(), Error> { + let mut me = self.inner.lock().unwrap(); + + me.recv_headers(self.peer, &self.send_buffer, frame) + } + + pub fn recv_data(&mut self, frame: frame::Data) -> Result<(), Error> { + let mut me = self.inner.lock().unwrap(); + me.recv_data(self.peer, &self.send_buffer, frame) + } + + pub fn recv_reset(&mut self, frame: frame::Reset) -> Result<(), Error> { + let mut me = self.inner.lock().unwrap(); + + me.recv_reset(&self.send_buffer, frame) + } + + /// Notify all streams that a connection-level error happened. + pub fn handle_error(&mut self, err: proto::Error) -> StreamId { + let mut me = self.inner.lock().unwrap(); + me.handle_error(&self.send_buffer, err) + } + + pub fn recv_go_away(&mut self, frame: &frame::GoAway) -> Result<(), Error> { + let mut me = self.inner.lock().unwrap(); + me.recv_go_away(&self.send_buffer, frame) + } + + pub fn last_processed_id(&self) -> StreamId { + self.inner.lock().unwrap().actions.recv.last_processed_id() + } + + pub fn recv_window_update(&mut self, frame: frame::WindowUpdate) -> Result<(), Error> { + let mut me = self.inner.lock().unwrap(); + me.recv_window_update(&self.send_buffer, frame) + } + + pub fn recv_push_promise(&mut self, frame: frame::PushPromise) -> Result<(), Error> { + let mut me = self.inner.lock().unwrap(); + me.recv_push_promise(&self.send_buffer, frame) + } + + pub fn recv_eof(&mut self, clear_pending_accept: bool) -> Result<(), ()> { + let mut me = self.inner.lock().map_err(|_| ())?; + me.recv_eof(&self.send_buffer, clear_pending_accept) + } + + pub fn send_reset(&mut self, id: StreamId, reason: Reason) { + let mut me = self.inner.lock().unwrap(); + me.send_reset(&self.send_buffer, id, reason) + } + + pub fn send_go_away(&mut self, last_processed_id: StreamId) { + let mut me = self.inner.lock().unwrap(); + me.actions.recv.go_away(last_processed_id); + } +} + +impl Inner { + fn new(peer: peer::Dyn, config: Config) -> Arc<Mutex<Self>> { + Arc::new(Mutex::new(Inner { + counts: Counts::new(peer, &config), + actions: Actions { + recv: Recv::new(peer, &config), + send: Send::new(&config), + task: None, + conn_error: None, + }, + store: Store::new(), + refs: 1, + })) + } + + fn recv_headers<B>( + &mut self, + peer: peer::Dyn, + send_buffer: &SendBuffer<B>, + frame: frame::Headers, + ) -> Result<(), Error> { + let id = frame.stream_id(); + + // The GOAWAY process has begun. All streams with a greater ID than + // specified as part of GOAWAY should be ignored. + if id > self.actions.recv.max_stream_id() { + tracing::trace!( + "id ({:?}) > max_stream_id ({:?}), ignoring HEADERS", + id, + self.actions.recv.max_stream_id() + ); + return Ok(()); + } + + let key = match self.store.find_entry(id) { + Entry::Occupied(e) => e.key(), + Entry::Vacant(e) => { + // Client: it's possible to send a request, and then send + // a RST_STREAM while the response HEADERS were in transit. + // + // Server: we can't reset a stream before having received + // the request headers, so don't allow. + if !peer.is_server() { + // This may be response headers for a stream we've already + // forgotten about... + if self.actions.may_have_forgotten_stream(peer, id) { + tracing::debug!( + "recv_headers for old stream={:?}, sending STREAM_CLOSED", + id, + ); + return Err(Error::library_reset(id, Reason::STREAM_CLOSED)); + } + } + + match self + .actions + .recv + .open(id, Open::Headers, &mut self.counts)? + { + Some(stream_id) => { + let stream = Stream::new( + stream_id, + self.actions.send.init_window_sz(), + self.actions.recv.init_window_sz(), + ); + + e.insert(stream) + } + None => return Ok(()), + } + } + }; + + let stream = self.store.resolve(key); + + if stream.state.is_local_reset() { + // Locally reset streams must ignore frames "for some time". + // This is because the remote may have sent trailers before + // receiving the RST_STREAM frame. + tracing::trace!("recv_headers; ignoring trailers on {:?}", stream.id); + return Ok(()); + } + + let actions = &mut self.actions; + let mut send_buffer = send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + self.counts.transition(stream, |counts, stream| { + tracing::trace!( + "recv_headers; stream={:?}; state={:?}", + stream.id, + stream.state + ); + + let res = if stream.state.is_recv_headers() { + match actions.recv.recv_headers(frame, stream, counts) { + Ok(()) => Ok(()), + Err(RecvHeaderBlockError::Oversize(resp)) => { + if let Some(resp) = resp { + let sent = actions.send.send_headers( + resp, send_buffer, stream, counts, &mut actions.task); + debug_assert!(sent.is_ok(), "oversize response should not fail"); + + actions.send.schedule_implicit_reset( + stream, + Reason::REFUSED_STREAM, + counts, + &mut actions.task); + + actions.recv.enqueue_reset_expiration(stream, counts); + + Ok(()) + } else { + Err(Error::library_reset(stream.id, Reason::REFUSED_STREAM)) + } + }, + Err(RecvHeaderBlockError::State(err)) => Err(err), + } + } else { + if !frame.is_end_stream() { + // Receiving trailers that don't set EOS is a "malformed" + // message. Malformed messages are a stream error. + proto_err!(stream: "recv_headers: trailers frame was not EOS; stream={:?}", stream.id); + return Err(Error::library_reset(stream.id, Reason::PROTOCOL_ERROR)); + } + + actions.recv.recv_trailers(frame, stream) + }; + + actions.reset_on_recv_stream_err(send_buffer, stream, counts, res) + }) + } + + fn recv_data<B>( + &mut self, + peer: peer::Dyn, + send_buffer: &SendBuffer<B>, + frame: frame::Data, + ) -> Result<(), Error> { + let id = frame.stream_id(); + + let stream = match self.store.find_mut(&id) { + Some(stream) => stream, + None => { + // The GOAWAY process has begun. All streams with a greater ID + // than specified as part of GOAWAY should be ignored. + if id > self.actions.recv.max_stream_id() { + tracing::trace!( + "id ({:?}) > max_stream_id ({:?}), ignoring DATA", + id, + self.actions.recv.max_stream_id() + ); + return Ok(()); + } + + if self.actions.may_have_forgotten_stream(peer, id) { + tracing::debug!("recv_data for old stream={:?}, sending STREAM_CLOSED", id,); + + let sz = frame.payload().len(); + // This should have been enforced at the codec::FramedRead layer, so + // this is just a sanity check. + assert!(sz <= super::MAX_WINDOW_SIZE as usize); + let sz = sz as WindowSize; + + self.actions.recv.ignore_data(sz)?; + return Err(Error::library_reset(id, Reason::STREAM_CLOSED)); + } + + proto_err!(conn: "recv_data: stream not found; id={:?}", id); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + }; + + let actions = &mut self.actions; + let mut send_buffer = send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + self.counts.transition(stream, |counts, stream| { + let sz = frame.payload().len(); + let res = actions.recv.recv_data(frame, stream); + + // Any stream error after receiving a DATA frame means + // we won't give the data to the user, and so they can't + // release the capacity. We do it automatically. + if let Err(Error::Reset(..)) = res { + actions + .recv + .release_connection_capacity(sz as WindowSize, &mut None); + } + actions.reset_on_recv_stream_err(send_buffer, stream, counts, res) + }) + } + + fn recv_reset<B>( + &mut self, + send_buffer: &SendBuffer<B>, + frame: frame::Reset, + ) -> Result<(), Error> { + let id = frame.stream_id(); + + if id.is_zero() { + proto_err!(conn: "recv_reset: invalid stream ID 0"); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR)); + } + + // The GOAWAY process has begun. All streams with a greater ID than + // specified as part of GOAWAY should be ignored. + if id > self.actions.recv.max_stream_id() { + tracing::trace!( + "id ({:?}) > max_stream_id ({:?}), ignoring RST_STREAM", + id, + self.actions.recv.max_stream_id() + ); + return Ok(()); + } + + let stream = match self.store.find_mut(&id) { + Some(stream) => stream, + None => { + // TODO: Are there other error cases? + self.actions + .ensure_not_idle(self.counts.peer(), id) + .map_err(Error::library_go_away)?; + + return Ok(()); + } + }; + + let mut send_buffer = send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + let actions = &mut self.actions; + + self.counts.transition(stream, |counts, stream| { + actions.recv.recv_reset(frame, stream); + actions.send.handle_error(send_buffer, stream, counts); + assert!(stream.state.is_closed()); + Ok(()) + }) + } + + fn recv_window_update<B>( + &mut self, + send_buffer: &SendBuffer<B>, + frame: frame::WindowUpdate, + ) -> Result<(), Error> { + let id = frame.stream_id(); + + let mut send_buffer = send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + if id.is_zero() { + self.actions + .send + .recv_connection_window_update(frame, &mut self.store, &mut self.counts) + .map_err(Error::library_go_away)?; + } else { + // The remote may send window updates for streams that the local now + // considers closed. It's ok... + if let Some(mut stream) = self.store.find_mut(&id) { + // This result is ignored as there is nothing to do when there + // is an error. The stream is reset by the function on error and + // the error is informational. + let _ = self.actions.send.recv_stream_window_update( + frame.size_increment(), + send_buffer, + &mut stream, + &mut self.counts, + &mut self.actions.task, + ); + } else { + self.actions + .ensure_not_idle(self.counts.peer(), id) + .map_err(Error::library_go_away)?; + } + } + + Ok(()) + } + + fn handle_error<B>(&mut self, send_buffer: &SendBuffer<B>, err: proto::Error) -> StreamId { + let actions = &mut self.actions; + let counts = &mut self.counts; + let mut send_buffer = send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + let last_processed_id = actions.recv.last_processed_id(); + + self.store.for_each(|stream| { + counts.transition(stream, |counts, stream| { + actions.recv.handle_error(&err, &mut *stream); + actions.send.handle_error(send_buffer, stream, counts); + }) + }); + + actions.conn_error = Some(err); + + last_processed_id + } + + fn recv_go_away<B>( + &mut self, + send_buffer: &SendBuffer<B>, + frame: &frame::GoAway, + ) -> Result<(), Error> { + let actions = &mut self.actions; + let counts = &mut self.counts; + let mut send_buffer = send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + let last_stream_id = frame.last_stream_id(); + + actions.send.recv_go_away(last_stream_id)?; + + let err = Error::remote_go_away(frame.debug_data().clone(), frame.reason()); + + self.store.for_each(|stream| { + if stream.id > last_stream_id { + counts.transition(stream, |counts, stream| { + actions.recv.handle_error(&err, &mut *stream); + actions.send.handle_error(send_buffer, stream, counts); + }) + } + }); + + actions.conn_error = Some(err); + + Ok(()) + } + + fn recv_push_promise<B>( + &mut self, + send_buffer: &SendBuffer<B>, + frame: frame::PushPromise, + ) -> Result<(), Error> { + let id = frame.stream_id(); + let promised_id = frame.promised_id(); + + // First, ensure that the initiating stream is still in a valid state. + let parent_key = match self.store.find_mut(&id) { + Some(stream) => { + // The GOAWAY process has begun. All streams with a greater ID + // than specified as part of GOAWAY should be ignored. + if id > self.actions.recv.max_stream_id() { + tracing::trace!( + "id ({:?}) > max_stream_id ({:?}), ignoring PUSH_PROMISE", + id, + self.actions.recv.max_stream_id() + ); + return Ok(()); + } + + // The stream must be receive open + stream.state.ensure_recv_open()?; + stream.key() + } + None => { + proto_err!(conn: "recv_push_promise: initiating stream is in an invalid state"); + return Err(Error::library_go_away(Reason::PROTOCOL_ERROR).into()); + } + }; + + // TODO: Streams in the reserved states do not count towards the concurrency + // limit. However, it seems like there should be a cap otherwise this + // could grow in memory indefinitely. + + // Ensure that we can reserve streams + self.actions.recv.ensure_can_reserve()?; + + // Next, open the stream. + // + // If `None` is returned, then the stream is being refused. There is no + // further work to be done. + if self + .actions + .recv + .open(promised_id, Open::PushPromise, &mut self.counts)? + .is_none() + { + return Ok(()); + } + + // Try to handle the frame and create a corresponding key for the pushed stream + // this requires a bit of indirection to make the borrow checker happy. + let child_key: Option<store::Key> = { + // Create state for the stream + let stream = self.store.insert(promised_id, { + Stream::new( + promised_id, + self.actions.send.init_window_sz(), + self.actions.recv.init_window_sz(), + ) + }); + + let actions = &mut self.actions; + + self.counts.transition(stream, |counts, stream| { + let stream_valid = actions.recv.recv_push_promise(frame, stream); + + match stream_valid { + Ok(()) => Ok(Some(stream.key())), + _ => { + let mut send_buffer = send_buffer.inner.lock().unwrap(); + actions + .reset_on_recv_stream_err( + &mut *send_buffer, + stream, + counts, + stream_valid, + ) + .map(|()| None) + } + } + })? + }; + // If we're successful, push the headers and stream... + if let Some(child) = child_key { + let mut ppp = self.store[parent_key].pending_push_promises.take(); + ppp.push(&mut self.store.resolve(child)); + + let parent = &mut self.store.resolve(parent_key); + parent.pending_push_promises = ppp; + parent.notify_recv(); + }; + + Ok(()) + } + + fn recv_eof<B>( + &mut self, + send_buffer: &SendBuffer<B>, + clear_pending_accept: bool, + ) -> Result<(), ()> { + let actions = &mut self.actions; + let counts = &mut self.counts; + let mut send_buffer = send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + if actions.conn_error.is_none() { + actions.conn_error = Some(io::Error::from(io::ErrorKind::BrokenPipe).into()); + } + + tracing::trace!("Streams::recv_eof"); + + self.store.for_each(|stream| { + counts.transition(stream, |counts, stream| { + actions.recv.recv_eof(stream); + + // This handles resetting send state associated with the + // stream + actions.send.handle_error(send_buffer, stream, counts); + }) + }); + + actions.clear_queues(clear_pending_accept, &mut self.store, counts); + Ok(()) + } + + fn poll_complete<T, B>( + &mut self, + send_buffer: &SendBuffer<B>, + cx: &mut Context, + dst: &mut Codec<T, Prioritized<B>>, + ) -> Poll<io::Result<()>> + where + T: AsyncWrite + Unpin, + B: Buf, + { + let mut send_buffer = send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + // Send WINDOW_UPDATE frames first + // + // TODO: It would probably be better to interleave updates w/ data + // frames. + ready!(self + .actions + .recv + .poll_complete(cx, &mut self.store, &mut self.counts, dst))?; + + // Send any other pending frames + ready!(self.actions.send.poll_complete( + cx, + send_buffer, + &mut self.store, + &mut self.counts, + dst + ))?; + + // Nothing else to do, track the task + self.actions.task = Some(cx.waker().clone()); + + Poll::Ready(Ok(())) + } + + fn send_reset<B>(&mut self, send_buffer: &SendBuffer<B>, id: StreamId, reason: Reason) { + let key = match self.store.find_entry(id) { + Entry::Occupied(e) => e.key(), + Entry::Vacant(e) => { + // Resetting a stream we don't know about? That could be OK... + // + // 1. As a server, we just received a request, but that request + // was bad, so we're resetting before even accepting it. + // This is totally fine. + // + // 2. The remote may have sent us a frame on new stream that + // it's *not* supposed to have done, and thus, we don't know + // the stream. In that case, sending a reset will "open" the + // stream in our store. Maybe that should be a connection + // error instead? At least for now, we need to update what + // our vision of the next stream is. + if self.counts.peer().is_local_init(id) { + // We normally would open this stream, so update our + // next-send-id record. + self.actions.send.maybe_reset_next_stream_id(id); + } else { + // We normally would recv this stream, so update our + // next-recv-id record. + self.actions.recv.maybe_reset_next_stream_id(id); + } + + let stream = Stream::new(id, 0, 0); + + e.insert(stream) + } + }; + + let stream = self.store.resolve(key); + let mut send_buffer = send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + self.actions.send_reset( + stream, + reason, + Initiator::Library, + &mut self.counts, + send_buffer, + ); + } +} + +impl<B> Streams<B, client::Peer> +where + B: Buf, +{ + pub fn poll_pending_open( + &mut self, + cx: &Context, + pending: Option<&OpaqueStreamRef>, + ) -> Poll<Result<(), crate::Error>> { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + me.actions.ensure_no_conn_error()?; + me.actions.send.ensure_next_stream_id()?; + + if let Some(pending) = pending { + let mut stream = me.store.resolve(pending.key); + tracing::trace!("poll_pending_open; stream = {:?}", stream.is_pending_open); + if stream.is_pending_open { + stream.wait_send(cx); + return Poll::Pending; + } + } + Poll::Ready(Ok(())) + } +} + +impl<B, P> Streams<B, P> +where + P: Peer, +{ + pub fn as_dyn(&self) -> DynStreams<B> { + let Self { + inner, + send_buffer, + _p, + } = self; + DynStreams { + inner, + send_buffer, + peer: P::r#dyn(), + } + } + + /// This function is safe to call multiple times. + /// + /// A `Result` is returned to avoid panicking if the mutex is poisoned. + pub fn recv_eof(&mut self, clear_pending_accept: bool) -> Result<(), ()> { + self.as_dyn().recv_eof(clear_pending_accept) + } + + pub(crate) fn max_send_streams(&self) -> usize { + self.inner.lock().unwrap().counts.max_send_streams() + } + + pub(crate) fn max_recv_streams(&self) -> usize { + self.inner.lock().unwrap().counts.max_recv_streams() + } + + #[cfg(feature = "unstable")] + pub fn num_active_streams(&self) -> usize { + let me = self.inner.lock().unwrap(); + me.store.num_active_streams() + } + + pub fn has_streams(&self) -> bool { + let me = self.inner.lock().unwrap(); + me.counts.has_streams() + } + + pub fn has_streams_or_other_references(&self) -> bool { + let me = self.inner.lock().unwrap(); + me.counts.has_streams() || me.refs > 1 + } + + #[cfg(feature = "unstable")] + pub fn num_wired_streams(&self) -> usize { + let me = self.inner.lock().unwrap(); + me.store.num_wired_streams() + } +} + +// no derive because we don't need B and P to be Clone. +impl<B, P> Clone for Streams<B, P> +where + P: Peer, +{ + fn clone(&self) -> Self { + self.inner.lock().unwrap().refs += 1; + Streams { + inner: self.inner.clone(), + send_buffer: self.send_buffer.clone(), + _p: ::std::marker::PhantomData, + } + } +} + +impl<B, P> Drop for Streams<B, P> +where + P: Peer, +{ + fn drop(&mut self) { + if let Ok(mut inner) = self.inner.lock() { + inner.refs -= 1; + if inner.refs == 1 { + if let Some(task) = inner.actions.task.take() { + task.wake(); + } + } + } + } +} + +// ===== impl StreamRef ===== + +impl<B> StreamRef<B> { + pub fn send_data(&mut self, data: B, end_stream: bool) -> Result<(), UserError> + where + B: Buf, + { + let mut me = self.opaque.inner.lock().unwrap(); + let me = &mut *me; + + let stream = me.store.resolve(self.opaque.key); + let actions = &mut me.actions; + let mut send_buffer = self.send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + me.counts.transition(stream, |counts, stream| { + // Create the data frame + let mut frame = frame::Data::new(stream.id, data); + frame.set_end_stream(end_stream); + + // Send the data frame + actions + .send + .send_data(frame, send_buffer, stream, counts, &mut actions.task) + }) + } + + pub fn send_trailers(&mut self, trailers: HeaderMap) -> Result<(), UserError> { + let mut me = self.opaque.inner.lock().unwrap(); + let me = &mut *me; + + let stream = me.store.resolve(self.opaque.key); + let actions = &mut me.actions; + let mut send_buffer = self.send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + me.counts.transition(stream, |counts, stream| { + // Create the trailers frame + let frame = frame::Headers::trailers(stream.id, trailers); + + // Send the trailers frame + actions + .send + .send_trailers(frame, send_buffer, stream, counts, &mut actions.task) + }) + } + + pub fn send_reset(&mut self, reason: Reason) { + let mut me = self.opaque.inner.lock().unwrap(); + let me = &mut *me; + + let stream = me.store.resolve(self.opaque.key); + let mut send_buffer = self.send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + me.actions + .send_reset(stream, reason, Initiator::User, &mut me.counts, send_buffer); + } + + pub fn send_response( + &mut self, + mut response: Response<()>, + end_of_stream: bool, + ) -> Result<(), UserError> { + // Clear before taking lock, incase extensions contain a StreamRef. + response.extensions_mut().clear(); + let mut me = self.opaque.inner.lock().unwrap(); + let me = &mut *me; + + let stream = me.store.resolve(self.opaque.key); + let actions = &mut me.actions; + let mut send_buffer = self.send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + me.counts.transition(stream, |counts, stream| { + let frame = server::Peer::convert_send_message(stream.id, response, end_of_stream); + + actions + .send + .send_headers(frame, send_buffer, stream, counts, &mut actions.task) + }) + } + + pub fn send_push_promise( + &mut self, + mut request: Request<()>, + ) -> Result<StreamRef<B>, UserError> { + // Clear before taking lock, incase extensions contain a StreamRef. + request.extensions_mut().clear(); + let mut me = self.opaque.inner.lock().unwrap(); + let me = &mut *me; + + let mut send_buffer = self.send_buffer.inner.lock().unwrap(); + let send_buffer = &mut *send_buffer; + + let actions = &mut me.actions; + let promised_id = actions.send.reserve_local()?; + + let child_key = { + let mut child_stream = me.store.insert( + promised_id, + Stream::new( + promised_id, + actions.send.init_window_sz(), + actions.recv.init_window_sz(), + ), + ); + child_stream.state.reserve_local()?; + child_stream.is_pending_push = true; + child_stream.key() + }; + + let pushed = { + let mut stream = me.store.resolve(self.opaque.key); + + let frame = crate::server::Peer::convert_push_message(stream.id, promised_id, request)?; + + actions + .send + .send_push_promise(frame, send_buffer, &mut stream, &mut actions.task) + }; + + if let Err(err) = pushed { + let mut child_stream = me.store.resolve(child_key); + child_stream.unlink(); + child_stream.remove(); + return Err(err.into()); + } + + me.refs += 1; + let opaque = + OpaqueStreamRef::new(self.opaque.inner.clone(), &mut me.store.resolve(child_key)); + + Ok(StreamRef { + opaque, + send_buffer: self.send_buffer.clone(), + }) + } + + /// Called by the server after the stream is accepted. Given that clients + /// initialize streams by sending HEADERS, the request will always be + /// available. + /// + /// # Panics + /// + /// This function panics if the request isn't present. + pub fn take_request(&self) -> Request<()> { + let mut me = self.opaque.inner.lock().unwrap(); + let me = &mut *me; + + let mut stream = me.store.resolve(self.opaque.key); + me.actions.recv.take_request(&mut stream) + } + + /// Called by a client to see if the current stream is pending open + pub fn is_pending_open(&self) -> bool { + let mut me = self.opaque.inner.lock().unwrap(); + me.store.resolve(self.opaque.key).is_pending_open + } + + /// Request capacity to send data + pub fn reserve_capacity(&mut self, capacity: WindowSize) { + let mut me = self.opaque.inner.lock().unwrap(); + let me = &mut *me; + + let mut stream = me.store.resolve(self.opaque.key); + + me.actions + .send + .reserve_capacity(capacity, &mut stream, &mut me.counts) + } + + /// Returns the stream's current send capacity. + pub fn capacity(&self) -> WindowSize { + let mut me = self.opaque.inner.lock().unwrap(); + let me = &mut *me; + + let mut stream = me.store.resolve(self.opaque.key); + + me.actions.send.capacity(&mut stream) + } + + /// Request to be notified when the stream's capacity increases + pub fn poll_capacity(&mut self, cx: &Context) -> Poll<Option<Result<WindowSize, UserError>>> { + let mut me = self.opaque.inner.lock().unwrap(); + let me = &mut *me; + + let mut stream = me.store.resolve(self.opaque.key); + + me.actions.send.poll_capacity(cx, &mut stream) + } + + /// Request to be notified for if a `RST_STREAM` is received for this stream. + pub(crate) fn poll_reset( + &mut self, + cx: &Context, + mode: proto::PollReset, + ) -> Poll<Result<Reason, crate::Error>> { + let mut me = self.opaque.inner.lock().unwrap(); + let me = &mut *me; + + let mut stream = me.store.resolve(self.opaque.key); + + me.actions + .send + .poll_reset(cx, &mut stream, mode) + .map_err(From::from) + } + + pub fn clone_to_opaque(&self) -> OpaqueStreamRef + where + B: 'static, + { + self.opaque.clone() + } + + pub fn stream_id(&self) -> StreamId { + self.opaque.stream_id() + } +} + +impl<B> Clone for StreamRef<B> { + fn clone(&self) -> Self { + StreamRef { + opaque: self.opaque.clone(), + send_buffer: self.send_buffer.clone(), + } + } +} + +// ===== impl OpaqueStreamRef ===== + +impl OpaqueStreamRef { + fn new(inner: Arc<Mutex<Inner>>, stream: &mut store::Ptr) -> OpaqueStreamRef { + stream.ref_inc(); + OpaqueStreamRef { + inner, + key: stream.key(), + } + } + /// Called by a client to check for a received response. + pub fn poll_response(&mut self, cx: &Context) -> Poll<Result<Response<()>, proto::Error>> { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + let mut stream = me.store.resolve(self.key); + + me.actions.recv.poll_response(cx, &mut stream) + } + /// Called by a client to check for a pushed request. + pub fn poll_pushed( + &mut self, + cx: &Context, + ) -> Poll<Option<Result<(Request<()>, OpaqueStreamRef), proto::Error>>> { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + let mut stream = me.store.resolve(self.key); + me.actions + .recv + .poll_pushed(cx, &mut stream) + .map_ok(|(h, key)| { + me.refs += 1; + let opaque_ref = + OpaqueStreamRef::new(self.inner.clone(), &mut me.store.resolve(key)); + (h, opaque_ref) + }) + } + + pub fn is_end_stream(&self) -> bool { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + let stream = me.store.resolve(self.key); + + me.actions.recv.is_end_stream(&stream) + } + + pub fn poll_data(&mut self, cx: &Context) -> Poll<Option<Result<Bytes, proto::Error>>> { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + let mut stream = me.store.resolve(self.key); + + me.actions.recv.poll_data(cx, &mut stream) + } + + pub fn poll_trailers(&mut self, cx: &Context) -> Poll<Option<Result<HeaderMap, proto::Error>>> { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + let mut stream = me.store.resolve(self.key); + + me.actions.recv.poll_trailers(cx, &mut stream) + } + + pub(crate) fn available_recv_capacity(&self) -> isize { + let me = self.inner.lock().unwrap(); + let me = &*me; + + let stream = &me.store[self.key]; + stream.recv_flow.available().into() + } + + pub(crate) fn used_recv_capacity(&self) -> WindowSize { + let me = self.inner.lock().unwrap(); + let me = &*me; + + let stream = &me.store[self.key]; + stream.in_flight_recv_data + } + + /// Releases recv capacity back to the peer. This may result in sending + /// WINDOW_UPDATE frames on both the stream and connection. + pub fn release_capacity(&mut self, capacity: WindowSize) -> Result<(), UserError> { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + let mut stream = me.store.resolve(self.key); + + me.actions + .recv + .release_capacity(capacity, &mut stream, &mut me.actions.task) + } + + pub(crate) fn clear_recv_buffer(&mut self) { + let mut me = self.inner.lock().unwrap(); + let me = &mut *me; + + let mut stream = me.store.resolve(self.key); + + me.actions.recv.clear_recv_buffer(&mut stream); + } + + pub fn stream_id(&self) -> StreamId { + self.inner.lock().unwrap().store[self.key].id + } +} + +impl fmt::Debug for OpaqueStreamRef { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + use std::sync::TryLockError::*; + + match self.inner.try_lock() { + Ok(me) => { + let stream = &me.store[self.key]; + fmt.debug_struct("OpaqueStreamRef") + .field("stream_id", &stream.id) + .field("ref_count", &stream.ref_count) + .finish() + } + Err(Poisoned(_)) => fmt + .debug_struct("OpaqueStreamRef") + .field("inner", &"<Poisoned>") + .finish(), + Err(WouldBlock) => fmt + .debug_struct("OpaqueStreamRef") + .field("inner", &"<Locked>") + .finish(), + } + } +} + +impl Clone for OpaqueStreamRef { + fn clone(&self) -> Self { + // Increment the ref count + let mut inner = self.inner.lock().unwrap(); + inner.store.resolve(self.key).ref_inc(); + inner.refs += 1; + + OpaqueStreamRef { + inner: self.inner.clone(), + key: self.key.clone(), + } + } +} + +impl Drop for OpaqueStreamRef { + fn drop(&mut self) { + drop_stream_ref(&self.inner, self.key); + } +} + +// TODO: Move back in fn above +fn drop_stream_ref(inner: &Mutex<Inner>, key: store::Key) { + let mut me = match inner.lock() { + Ok(inner) => inner, + Err(_) => { + if ::std::thread::panicking() { + tracing::trace!("StreamRef::drop; mutex poisoned"); + return; + } else { + panic!("StreamRef::drop; mutex poisoned"); + } + } + }; + + let me = &mut *me; + me.refs -= 1; + let mut stream = me.store.resolve(key); + + tracing::trace!("drop_stream_ref; stream={:?}", stream); + + // decrement the stream's ref count by 1. + stream.ref_dec(); + + let actions = &mut me.actions; + + // If the stream is not referenced and it is already + // closed (does not have to go through logic below + // of canceling the stream), we should notify the task + // (connection) so that it can close properly + if stream.ref_count == 0 && stream.is_closed() { + if let Some(task) = actions.task.take() { + task.wake(); + } + } + + me.counts.transition(stream, |counts, stream| { + maybe_cancel(stream, actions, counts); + + if stream.ref_count == 0 { + // Release any recv window back to connection, no one can access + // it anymore. + actions + .recv + .release_closed_capacity(stream, &mut actions.task); + + // We won't be able to reach our push promises anymore + let mut ppp = stream.pending_push_promises.take(); + while let Some(promise) = ppp.pop(stream.store_mut()) { + counts.transition(promise, |counts, stream| { + maybe_cancel(stream, actions, counts); + }); + } + } + }); +} + +fn maybe_cancel(stream: &mut store::Ptr, actions: &mut Actions, counts: &mut Counts) { + if stream.is_canceled_interest() { + // Server is allowed to early respond without fully consuming the client input stream + // But per the RFC, must send a RST_STREAM(NO_ERROR) in such cases. https://www.rfc-editor.org/rfc/rfc7540#section-8.1 + // Some other http2 implementation may interpret other error code as fatal if not respected (i.e: nginx https://trac.nginx.org/nginx/ticket/2376) + let reason = if counts.peer().is_server() + && stream.state.is_send_closed() + && stream.state.is_recv_streaming() + { + Reason::NO_ERROR + } else { + Reason::CANCEL + }; + + actions + .send + .schedule_implicit_reset(stream, reason, counts, &mut actions.task); + actions.recv.enqueue_reset_expiration(stream, counts); + } +} + +// ===== impl SendBuffer ===== + +impl<B> SendBuffer<B> { + fn new() -> Self { + let inner = Mutex::new(Buffer::new()); + SendBuffer { inner } + } +} + +// ===== impl Actions ===== + +impl Actions { + fn send_reset<B>( + &mut self, + stream: store::Ptr, + reason: Reason, + initiator: Initiator, + counts: &mut Counts, + send_buffer: &mut Buffer<Frame<B>>, + ) { + counts.transition(stream, |counts, stream| { + self.send.send_reset( + reason, + initiator, + send_buffer, + stream, + counts, + &mut self.task, + ); + self.recv.enqueue_reset_expiration(stream, counts); + // if a RecvStream is parked, ensure it's notified + stream.notify_recv(); + }); + } + + fn reset_on_recv_stream_err<B>( + &mut self, + buffer: &mut Buffer<Frame<B>>, + stream: &mut store::Ptr, + counts: &mut Counts, + res: Result<(), Error>, + ) -> Result<(), Error> { + if let Err(Error::Reset(stream_id, reason, initiator)) = res { + debug_assert_eq!(stream_id, stream.id); + // Reset the stream. + self.send + .send_reset(reason, initiator, buffer, stream, counts, &mut self.task); + Ok(()) + } else { + res + } + } + + fn ensure_not_idle(&mut self, peer: peer::Dyn, id: StreamId) -> Result<(), Reason> { + if peer.is_local_init(id) { + self.send.ensure_not_idle(id) + } else { + self.recv.ensure_not_idle(id) + } + } + + fn ensure_no_conn_error(&self) -> Result<(), proto::Error> { + if let Some(ref err) = self.conn_error { + Err(err.clone()) + } else { + Ok(()) + } + } + + /// Check if we possibly could have processed and since forgotten this stream. + /// + /// If we send a RST_STREAM for a stream, we will eventually "forget" about + /// the stream to free up memory. It's possible that the remote peer had + /// frames in-flight, and by the time we receive them, our own state is + /// gone. We *could* tear everything down by sending a GOAWAY, but it + /// is more likely to be latency/memory constraints that caused this, + /// and not a bad actor. So be less catastrophic, the spec allows + /// us to send another RST_STREAM of STREAM_CLOSED. + fn may_have_forgotten_stream(&self, peer: peer::Dyn, id: StreamId) -> bool { + if id.is_zero() { + return false; + } + if peer.is_local_init(id) { + self.send.may_have_created_stream(id) + } else { + self.recv.may_have_created_stream(id) + } + } + + fn clear_queues(&mut self, clear_pending_accept: bool, store: &mut Store, counts: &mut Counts) { + self.recv.clear_queues(clear_pending_accept, store, counts); + self.send.clear_queues(store, counts); + } +} diff --git a/third_party/rust/h2/src/server.rs b/third_party/rust/h2/src/server.rs new file mode 100644 index 0000000000..9f56f184a5 --- /dev/null +++ b/third_party/rust/h2/src/server.rs @@ -0,0 +1,1552 @@ +//! Server implementation of the HTTP/2 protocol. +//! +//! # Getting started +//! +//! Running an HTTP/2 server requires the caller to manage accepting the +//! connections as well as getting the connections to a state that is ready to +//! begin the HTTP/2 handshake. See [here](../index.html#handshake) for more +//! details. +//! +//! This could be as basic as using Tokio's [`TcpListener`] to accept +//! connections, but usually it means using either ALPN or HTTP/1.1 protocol +//! upgrades. +//! +//! Once a connection is obtained, it is passed to [`handshake`], +//! which will begin the [HTTP/2 handshake]. This returns a future that +//! completes once the handshake process is performed and HTTP/2 streams may +//! be received. +//! +//! [`handshake`] uses default configuration values. There are a number of +//! settings that can be changed by using [`Builder`] instead. +//! +//! # Inbound streams +//! +//! The [`Connection`] instance is used to accept inbound HTTP/2 streams. It +//! does this by implementing [`futures::Stream`]. When a new stream is +//! received, a call to [`Connection::accept`] will return `(request, response)`. +//! The `request` handle (of type [`http::Request<RecvStream>`]) contains the +//! HTTP request head as well as provides a way to receive the inbound data +//! stream and the trailers. The `response` handle (of type [`SendResponse`]) +//! allows responding to the request, stream the response payload, send +//! trailers, and send push promises. +//! +//! The send ([`SendStream`]) and receive ([`RecvStream`]) halves of the stream +//! can be operated independently. +//! +//! # Managing the connection +//! +//! The [`Connection`] instance is used to manage connection state. The caller +//! is required to call either [`Connection::accept`] or +//! [`Connection::poll_close`] in order to advance the connection state. Simply +//! operating on [`SendStream`] or [`RecvStream`] will have no effect unless the +//! connection state is advanced. +//! +//! It is not required to call **both** [`Connection::accept`] and +//! [`Connection::poll_close`]. If the caller is ready to accept a new stream, +//! then only [`Connection::accept`] should be called. When the caller **does +//! not** want to accept a new stream, [`Connection::poll_close`] should be +//! called. +//! +//! The [`Connection`] instance should only be dropped once +//! [`Connection::poll_close`] returns `Ready`. Once [`Connection::accept`] +//! returns `Ready(None)`, there will no longer be any more inbound streams. At +//! this point, only [`Connection::poll_close`] should be called. +//! +//! # Shutting down the server +//! +//! Graceful shutdown of the server is [not yet +//! implemented](https://github.com/hyperium/h2/issues/69). +//! +//! # Example +//! +//! A basic HTTP/2 server example that runs over TCP and assumes [prior +//! knowledge], i.e. both the client and the server assume that the TCP socket +//! will use the HTTP/2 protocol without prior negotiation. +//! +//! ```no_run +//! use h2::server; +//! use http::{Response, StatusCode}; +//! use tokio::net::TcpListener; +//! +//! #[tokio::main] +//! pub async fn main() { +//! let mut listener = TcpListener::bind("127.0.0.1:5928").await.unwrap(); +//! +//! // Accept all incoming TCP connections. +//! loop { +//! if let Ok((socket, _peer_addr)) = listener.accept().await { +//! // Spawn a new task to process each connection. +//! tokio::spawn(async { +//! // Start the HTTP/2 connection handshake +//! let mut h2 = server::handshake(socket).await.unwrap(); +//! // Accept all inbound HTTP/2 streams sent over the +//! // connection. +//! while let Some(request) = h2.accept().await { +//! let (request, mut respond) = request.unwrap(); +//! println!("Received request: {:?}", request); +//! +//! // Build a response with no body +//! let response = Response::builder() +//! .status(StatusCode::OK) +//! .body(()) +//! .unwrap(); +//! +//! // Send the response back to the client +//! respond.send_response(response, true) +//! .unwrap(); +//! } +//! +//! }); +//! } +//! } +//! } +//! ``` +//! +//! [prior knowledge]: http://httpwg.org/specs/rfc7540.html#known-http +//! [`handshake`]: fn.handshake.html +//! [HTTP/2 handshake]: http://httpwg.org/specs/rfc7540.html#ConnectionHeader +//! [`Builder`]: struct.Builder.html +//! [`Connection`]: struct.Connection.html +//! [`Connection::poll`]: struct.Connection.html#method.poll +//! [`Connection::poll_close`]: struct.Connection.html#method.poll_close +//! [`futures::Stream`]: https://docs.rs/futures/0.1/futures/stream/trait.Stream.html +//! [`http::Request<RecvStream>`]: ../struct.RecvStream.html +//! [`RecvStream`]: ../struct.RecvStream.html +//! [`SendStream`]: ../struct.SendStream.html +//! [`TcpListener`]: https://docs.rs/tokio-core/0.1/tokio_core/net/struct.TcpListener.html + +use crate::codec::{Codec, UserError}; +use crate::frame::{self, Pseudo, PushPromiseHeaderError, Reason, Settings, StreamId}; +use crate::proto::{self, Config, Error, Prioritized}; +use crate::{FlowControl, PingPong, RecvStream, SendStream}; + +use bytes::{Buf, Bytes}; +use http::{HeaderMap, Method, Request, Response}; +use std::future::Future; +use std::pin::Pin; +use std::task::{Context, Poll}; +use std::time::Duration; +use std::{fmt, io}; +use tokio::io::{AsyncRead, AsyncWrite, ReadBuf}; +use tracing::instrument::{Instrument, Instrumented}; + +/// In progress HTTP/2 connection handshake future. +/// +/// This type implements `Future`, yielding a `Connection` instance once the +/// handshake has completed. +/// +/// The handshake is completed once the connection preface is fully received +/// from the client **and** the initial settings frame is sent to the client. +/// +/// The handshake future does not wait for the initial settings frame from the +/// client. +/// +/// See [module] level docs for more details. +/// +/// [module]: index.html +#[must_use = "futures do nothing unless polled"] +pub struct Handshake<T, B: Buf = Bytes> { + /// The config to pass to Connection::new after handshake succeeds. + builder: Builder, + /// The current state of the handshake. + state: Handshaking<T, B>, + /// Span tracking the handshake + span: tracing::Span, +} + +/// Accepts inbound HTTP/2 streams on a connection. +/// +/// A `Connection` is backed by an I/O resource (usually a TCP socket) and +/// implements the HTTP/2 server logic for that connection. It is responsible +/// for receiving inbound streams initiated by the client as well as driving the +/// internal state forward. +/// +/// `Connection` values are created by calling [`handshake`]. Once a +/// `Connection` value is obtained, the caller must call [`poll`] or +/// [`poll_close`] in order to drive the internal connection state forward. +/// +/// See [module level] documentation for more details +/// +/// [module level]: index.html +/// [`handshake`]: struct.Connection.html#method.handshake +/// [`poll`]: struct.Connection.html#method.poll +/// [`poll_close`]: struct.Connection.html#method.poll_close +/// +/// # Examples +/// +/// ``` +/// # use tokio::io::{AsyncRead, AsyncWrite}; +/// # use h2::server; +/// # use h2::server::*; +/// # +/// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) { +/// let mut server = server::handshake(my_io).await.unwrap(); +/// while let Some(request) = server.accept().await { +/// tokio::spawn(async move { +/// let (request, respond) = request.unwrap(); +/// // Process the request and send the response back to the client +/// // using `respond`. +/// }); +/// } +/// # } +/// # +/// # pub fn main() {} +/// ``` +#[must_use = "streams do nothing unless polled"] +pub struct Connection<T, B: Buf> { + connection: proto::Connection<T, Peer, B>, +} + +/// Builds server connections with custom configuration values. +/// +/// Methods can be chained in order to set the configuration values. +/// +/// The server is constructed by calling [`handshake`] and passing the I/O +/// handle that will back the HTTP/2 server. +/// +/// New instances of `Builder` are obtained via [`Builder::new`]. +/// +/// See function level documentation for details on the various server +/// configuration settings. +/// +/// [`Builder::new`]: struct.Builder.html#method.new +/// [`handshake`]: struct.Builder.html#method.handshake +/// +/// # Examples +/// +/// ``` +/// # use tokio::io::{AsyncRead, AsyncWrite}; +/// # use h2::server::*; +/// # +/// # fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) +/// # -> Handshake<T> +/// # { +/// // `server_fut` is a future representing the completion of the HTTP/2 +/// // handshake. +/// let server_fut = Builder::new() +/// .initial_window_size(1_000_000) +/// .max_concurrent_streams(1000) +/// .handshake(my_io); +/// # server_fut +/// # } +/// # +/// # pub fn main() {} +/// ``` +#[derive(Clone, Debug)] +pub struct Builder { + /// Time to keep locally reset streams around before reaping. + reset_stream_duration: Duration, + + /// Maximum number of locally reset streams to keep at a time. + reset_stream_max: usize, + + /// Initial `Settings` frame to send as part of the handshake. + settings: Settings, + + /// Initial target window size for new connections. + initial_target_connection_window_size: Option<u32>, + + /// Maximum amount of bytes to "buffer" for writing per stream. + max_send_buffer_size: usize, +} + +/// Send a response back to the client +/// +/// A `SendResponse` instance is provided when receiving a request and is used +/// to send the associated response back to the client. It is also used to +/// explicitly reset the stream with a custom reason. +/// +/// It will also be used to initiate push promises linked with the associated +/// stream. +/// +/// If the `SendResponse` instance is dropped without sending a response, then +/// the HTTP/2 stream will be reset. +/// +/// See [module] level docs for more details. +/// +/// [module]: index.html +#[derive(Debug)] +pub struct SendResponse<B: Buf> { + inner: proto::StreamRef<B>, +} + +/// Send a response to a promised request +/// +/// A `SendPushedResponse` instance is provided when promising a request and is used +/// to send the associated response to the client. It is also used to +/// explicitly reset the stream with a custom reason. +/// +/// It can not be used to initiate push promises. +/// +/// If the `SendPushedResponse` instance is dropped without sending a response, then +/// the HTTP/2 stream will be reset. +/// +/// See [module] level docs for more details. +/// +/// [module]: index.html +pub struct SendPushedResponse<B: Buf> { + inner: SendResponse<B>, +} + +// Manual implementation necessary because of rust-lang/rust#26925 +impl<B: Buf + fmt::Debug> fmt::Debug for SendPushedResponse<B> { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + write!(f, "SendPushedResponse {{ {:?} }}", self.inner) + } +} + +/// Stages of an in-progress handshake. +enum Handshaking<T, B: Buf> { + /// State 1. Connection is flushing pending SETTINGS frame. + Flushing(Instrumented<Flush<T, Prioritized<B>>>), + /// State 2. Connection is waiting for the client preface. + ReadingPreface(Instrumented<ReadPreface<T, Prioritized<B>>>), + /// State 3. Handshake is done, polling again would panic. + Done, +} + +/// Flush a Sink +struct Flush<T, B> { + codec: Option<Codec<T, B>>, +} + +/// Read the client connection preface +struct ReadPreface<T, B> { + codec: Option<Codec<T, B>>, + pos: usize, +} + +#[derive(Debug)] +pub(crate) struct Peer; + +const PREFACE: [u8; 24] = *b"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"; + +/// Creates a new configured HTTP/2 server with default configuration +/// values backed by `io`. +/// +/// It is expected that `io` already be in an appropriate state to commence +/// the [HTTP/2 handshake]. See [Handshake] for more details. +/// +/// Returns a future which resolves to the [`Connection`] instance once the +/// HTTP/2 handshake has been completed. The returned [`Connection`] +/// instance will be using default configuration values. Use [`Builder`] to +/// customize the configuration values used by a [`Connection`] instance. +/// +/// [HTTP/2 handshake]: http://httpwg.org/specs/rfc7540.html#ConnectionHeader +/// [Handshake]: ../index.html#handshake +/// [`Connection`]: struct.Connection.html +/// +/// # Examples +/// +/// ``` +/// # use tokio::io::{AsyncRead, AsyncWrite}; +/// # use h2::server; +/// # use h2::server::*; +/// # +/// # async fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) +/// # { +/// let connection = server::handshake(my_io).await.unwrap(); +/// // The HTTP/2 handshake has completed, now use `connection` to +/// // accept inbound HTTP/2 streams. +/// # } +/// # +/// # pub fn main() {} +/// ``` +pub fn handshake<T>(io: T) -> Handshake<T, Bytes> +where + T: AsyncRead + AsyncWrite + Unpin, +{ + Builder::new().handshake(io) +} + +// ===== impl Connection ===== + +impl<T, B> Connection<T, B> +where + T: AsyncRead + AsyncWrite + Unpin, + B: Buf + 'static, +{ + fn handshake2(io: T, builder: Builder) -> Handshake<T, B> { + let span = tracing::trace_span!("server_handshake"); + let entered = span.enter(); + + // Create the codec. + let mut codec = Codec::new(io); + + if let Some(max) = builder.settings.max_frame_size() { + codec.set_max_recv_frame_size(max as usize); + } + + if let Some(max) = builder.settings.max_header_list_size() { + codec.set_max_recv_header_list_size(max as usize); + } + + // Send initial settings frame. + codec + .buffer(builder.settings.clone().into()) + .expect("invalid SETTINGS frame"); + + // Create the handshake future. + let state = + Handshaking::Flushing(Flush::new(codec).instrument(tracing::trace_span!("flush"))); + + drop(entered); + + Handshake { + builder, + state, + span, + } + } + + /// Accept the next incoming request on this connection. + pub async fn accept( + &mut self, + ) -> Option<Result<(Request<RecvStream>, SendResponse<B>), crate::Error>> { + futures_util::future::poll_fn(move |cx| self.poll_accept(cx)).await + } + + #[doc(hidden)] + pub fn poll_accept( + &mut self, + cx: &mut Context<'_>, + ) -> Poll<Option<Result<(Request<RecvStream>, SendResponse<B>), crate::Error>>> { + // Always try to advance the internal state. Getting Pending also is + // needed to allow this function to return Pending. + if let Poll::Ready(_) = self.poll_closed(cx)? { + // If the socket is closed, don't return anything + // TODO: drop any pending streams + return Poll::Ready(None); + } + + if let Some(inner) = self.connection.next_incoming() { + tracing::trace!("received incoming"); + let (head, _) = inner.take_request().into_parts(); + let body = RecvStream::new(FlowControl::new(inner.clone_to_opaque())); + + let request = Request::from_parts(head, body); + let respond = SendResponse { inner }; + + return Poll::Ready(Some(Ok((request, respond)))); + } + + Poll::Pending + } + + /// Sets the target window size for the whole connection. + /// + /// If `size` is greater than the current value, then a `WINDOW_UPDATE` + /// frame will be immediately sent to the remote, increasing the connection + /// level window by `size - current_value`. + /// + /// If `size` is less than the current value, nothing will happen + /// immediately. However, as window capacity is released by + /// [`FlowControl`] instances, no `WINDOW_UPDATE` frames will be sent + /// out until the number of "in flight" bytes drops below `size`. + /// + /// The default value is 65,535. + /// + /// See [`FlowControl`] documentation for more details. + /// + /// [`FlowControl`]: ../struct.FlowControl.html + /// [library level]: ../index.html#flow-control + pub fn set_target_window_size(&mut self, size: u32) { + assert!(size <= proto::MAX_WINDOW_SIZE); + self.connection.set_target_window_size(size); + } + + /// Set a new `INITIAL_WINDOW_SIZE` setting (in octets) for stream-level + /// flow control for received data. + /// + /// The `SETTINGS` will be sent to the remote, and only applied once the + /// remote acknowledges the change. + /// + /// This can be used to increase or decrease the window size for existing + /// streams. + /// + /// # Errors + /// + /// Returns an error if a previous call is still pending acknowledgement + /// from the remote endpoint. + pub fn set_initial_window_size(&mut self, size: u32) -> Result<(), crate::Error> { + assert!(size <= proto::MAX_WINDOW_SIZE); + self.connection.set_initial_window_size(size)?; + Ok(()) + } + + /// Enables the [extended CONNECT protocol]. + /// + /// [extended CONNECT protocol]: https://datatracker.ietf.org/doc/html/rfc8441#section-4 + /// + /// # Errors + /// + /// Returns an error if a previous call is still pending acknowledgement + /// from the remote endpoint. + pub fn enable_connect_protocol(&mut self) -> Result<(), crate::Error> { + self.connection.set_enable_connect_protocol()?; + Ok(()) + } + + /// Returns `Ready` when the underlying connection has closed. + /// + /// If any new inbound streams are received during a call to `poll_closed`, + /// they will be queued and returned on the next call to [`poll_accept`]. + /// + /// This function will advance the internal connection state, driving + /// progress on all the other handles (e.g. [`RecvStream`] and [`SendStream`]). + /// + /// See [here](index.html#managing-the-connection) for more details. + /// + /// [`poll_accept`]: struct.Connection.html#method.poll_accept + /// [`RecvStream`]: ../struct.RecvStream.html + /// [`SendStream`]: ../struct.SendStream.html + pub fn poll_closed(&mut self, cx: &mut Context) -> Poll<Result<(), crate::Error>> { + self.connection.poll(cx).map_err(Into::into) + } + + #[doc(hidden)] + #[deprecated(note = "renamed to poll_closed")] + pub fn poll_close(&mut self, cx: &mut Context) -> Poll<Result<(), crate::Error>> { + self.poll_closed(cx) + } + + /// Sets the connection to a GOAWAY state. + /// + /// Does not terminate the connection. Must continue being polled to close + /// connection. + /// + /// After flushing the GOAWAY frame, the connection is closed. Any + /// outstanding streams do not prevent the connection from closing. This + /// should usually be reserved for shutting down when something bad + /// external to `h2` has happened, and open streams cannot be properly + /// handled. + /// + /// For graceful shutdowns, see [`graceful_shutdown`](Connection::graceful_shutdown). + pub fn abrupt_shutdown(&mut self, reason: Reason) { + self.connection.go_away_from_user(reason); + } + + /// Starts a [graceful shutdown][1] process. + /// + /// Must continue being polled to close connection. + /// + /// It's possible to receive more requests after calling this method, since + /// they might have been in-flight from the client already. After about + /// 1 RTT, no new requests should be accepted. Once all active streams + /// have completed, the connection is closed. + /// + /// [1]: http://httpwg.org/specs/rfc7540.html#GOAWAY + pub fn graceful_shutdown(&mut self) { + self.connection.go_away_gracefully(); + } + + /// Takes a `PingPong` instance from the connection. + /// + /// # Note + /// + /// This may only be called once. Calling multiple times will return `None`. + pub fn ping_pong(&mut self) -> Option<PingPong> { + self.connection.take_user_pings().map(PingPong::new) + } + + /// Returns the maximum number of concurrent streams that may be initiated + /// by the server on this connection. + /// + /// This limit is configured by the client peer by sending the + /// [`SETTINGS_MAX_CONCURRENT_STREAMS` parameter][1] in a `SETTINGS` frame. + /// This method returns the currently acknowledged value received from the + /// remote. + /// + /// [1]: https://tools.ietf.org/html/rfc7540#section-5.1.2 + pub fn max_concurrent_send_streams(&self) -> usize { + self.connection.max_send_streams() + } + + /// Returns the maximum number of concurrent streams that may be initiated + /// by the client on this connection. + /// + /// This returns the value of the [`SETTINGS_MAX_CONCURRENT_STREAMS` + /// parameter][1] sent in a `SETTINGS` frame that has been + /// acknowledged by the remote peer. The value to be sent is configured by + /// the [`Builder::max_concurrent_streams`][2] method before handshaking + /// with the remote peer. + /// + /// [1]: https://tools.ietf.org/html/rfc7540#section-5.1.2 + /// [2]: ../struct.Builder.html#method.max_concurrent_streams + pub fn max_concurrent_recv_streams(&self) -> usize { + self.connection.max_recv_streams() + } +} + +#[cfg(feature = "stream")] +impl<T, B> futures_core::Stream for Connection<T, B> +where + T: AsyncRead + AsyncWrite + Unpin, + B: Buf + 'static, +{ + type Item = Result<(Request<RecvStream>, SendResponse<B>), crate::Error>; + + fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> { + self.poll_accept(cx) + } +} + +impl<T, B> fmt::Debug for Connection<T, B> +where + T: fmt::Debug, + B: fmt::Debug + Buf, +{ + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + fmt.debug_struct("Connection") + .field("connection", &self.connection) + .finish() + } +} + +// ===== impl Builder ===== + +impl Builder { + /// Returns a new server builder instance initialized with default + /// configuration values. + /// + /// Configuration methods can be chained on the return value. + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::server::*; + /// # + /// # fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Handshake<T> + /// # { + /// // `server_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let server_fut = Builder::new() + /// .initial_window_size(1_000_000) + /// .max_concurrent_streams(1000) + /// .handshake(my_io); + /// # server_fut + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn new() -> Builder { + Builder { + reset_stream_duration: Duration::from_secs(proto::DEFAULT_RESET_STREAM_SECS), + reset_stream_max: proto::DEFAULT_RESET_STREAM_MAX, + settings: Settings::default(), + initial_target_connection_window_size: None, + max_send_buffer_size: proto::DEFAULT_MAX_SEND_BUFFER_SIZE, + } + } + + /// Indicates the initial window size (in octets) for stream-level + /// flow control for received data. + /// + /// The initial window of a stream is used as part of flow control. For more + /// details, see [`FlowControl`]. + /// + /// The default value is 65,535. + /// + /// [`FlowControl`]: ../struct.FlowControl.html + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::server::*; + /// # + /// # fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Handshake<T> + /// # { + /// // `server_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let server_fut = Builder::new() + /// .initial_window_size(1_000_000) + /// .handshake(my_io); + /// # server_fut + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn initial_window_size(&mut self, size: u32) -> &mut Self { + self.settings.set_initial_window_size(Some(size)); + self + } + + /// Indicates the initial window size (in octets) for connection-level flow control + /// for received data. + /// + /// The initial window of a connection is used as part of flow control. For more details, + /// see [`FlowControl`]. + /// + /// The default value is 65,535. + /// + /// [`FlowControl`]: ../struct.FlowControl.html + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::server::*; + /// # + /// # fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Handshake<T> + /// # { + /// // `server_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let server_fut = Builder::new() + /// .initial_connection_window_size(1_000_000) + /// .handshake(my_io); + /// # server_fut + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn initial_connection_window_size(&mut self, size: u32) -> &mut Self { + self.initial_target_connection_window_size = Some(size); + self + } + + /// Indicates the size (in octets) of the largest HTTP/2 frame payload that the + /// configured server is able to accept. + /// + /// The sender may send data frames that are **smaller** than this value, + /// but any data larger than `max` will be broken up into multiple `DATA` + /// frames. + /// + /// The value **must** be between 16,384 and 16,777,215. The default value is 16,384. + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::server::*; + /// # + /// # fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Handshake<T> + /// # { + /// // `server_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let server_fut = Builder::new() + /// .max_frame_size(1_000_000) + /// .handshake(my_io); + /// # server_fut + /// # } + /// # + /// # pub fn main() {} + /// ``` + /// + /// # Panics + /// + /// This function panics if `max` is not within the legal range specified + /// above. + pub fn max_frame_size(&mut self, max: u32) -> &mut Self { + self.settings.set_max_frame_size(Some(max)); + self + } + + /// Sets the max size of received header frames. + /// + /// This advisory setting informs a peer of the maximum size of header list + /// that the sender is prepared to accept, in octets. The value is based on + /// the uncompressed size of header fields, including the length of the name + /// and value in octets plus an overhead of 32 octets for each header field. + /// + /// This setting is also used to limit the maximum amount of data that is + /// buffered to decode HEADERS frames. + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::server::*; + /// # + /// # fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Handshake<T> + /// # { + /// // `server_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let server_fut = Builder::new() + /// .max_header_list_size(16 * 1024) + /// .handshake(my_io); + /// # server_fut + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn max_header_list_size(&mut self, max: u32) -> &mut Self { + self.settings.set_max_header_list_size(Some(max)); + self + } + + /// Sets the maximum number of concurrent streams. + /// + /// The maximum concurrent streams setting only controls the maximum number + /// of streams that can be initiated by the remote peer. In other words, + /// when this setting is set to 100, this does not limit the number of + /// concurrent streams that can be created by the caller. + /// + /// It is recommended that this value be no smaller than 100, so as to not + /// unnecessarily limit parallelism. However, any value is legal, including + /// 0. If `max` is set to 0, then the remote will not be permitted to + /// initiate streams. + /// + /// Note that streams in the reserved state, i.e., push promises that have + /// been reserved but the stream has not started, do not count against this + /// setting. + /// + /// Also note that if the remote *does* exceed the value set here, it is not + /// a protocol level error. Instead, the `h2` library will immediately reset + /// the stream. + /// + /// See [Section 5.1.2] in the HTTP/2 spec for more details. + /// + /// [Section 5.1.2]: https://http2.github.io/http2-spec/#rfc.section.5.1.2 + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::server::*; + /// # + /// # fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Handshake<T> + /// # { + /// // `server_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let server_fut = Builder::new() + /// .max_concurrent_streams(1000) + /// .handshake(my_io); + /// # server_fut + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn max_concurrent_streams(&mut self, max: u32) -> &mut Self { + self.settings.set_max_concurrent_streams(Some(max)); + self + } + + /// Sets the maximum number of concurrent locally reset streams. + /// + /// When a stream is explicitly reset by either calling + /// [`SendResponse::send_reset`] or by dropping a [`SendResponse`] instance + /// before completing the stream, the HTTP/2 specification requires that + /// any further frames received for that stream must be ignored for "some + /// time". + /// + /// In order to satisfy the specification, internal state must be maintained + /// to implement the behavior. This state grows linearly with the number of + /// streams that are locally reset. + /// + /// The `max_concurrent_reset_streams` setting configures sets an upper + /// bound on the amount of state that is maintained. When this max value is + /// reached, the oldest reset stream is purged from memory. + /// + /// Once the stream has been fully purged from memory, any additional frames + /// received for that stream will result in a connection level protocol + /// error, forcing the connection to terminate. + /// + /// The default value is 10. + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::server::*; + /// # + /// # fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Handshake<T> + /// # { + /// // `server_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let server_fut = Builder::new() + /// .max_concurrent_reset_streams(1000) + /// .handshake(my_io); + /// # server_fut + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn max_concurrent_reset_streams(&mut self, max: usize) -> &mut Self { + self.reset_stream_max = max; + self + } + + /// Sets the maximum send buffer size per stream. + /// + /// Once a stream has buffered up to (or over) the maximum, the stream's + /// flow control will not "poll" additional capacity. Once bytes for the + /// stream have been written to the connection, the send buffer capacity + /// will be freed up again. + /// + /// The default is currently ~400MB, but may change. + /// + /// # Panics + /// + /// This function panics if `max` is larger than `u32::MAX`. + pub fn max_send_buffer_size(&mut self, max: usize) -> &mut Self { + assert!(max <= std::u32::MAX as usize); + self.max_send_buffer_size = max; + self + } + + /// Sets the maximum number of concurrent locally reset streams. + /// + /// When a stream is explicitly reset by either calling + /// [`SendResponse::send_reset`] or by dropping a [`SendResponse`] instance + /// before completing the stream, the HTTP/2 specification requires that + /// any further frames received for that stream must be ignored for "some + /// time". + /// + /// In order to satisfy the specification, internal state must be maintained + /// to implement the behavior. This state grows linearly with the number of + /// streams that are locally reset. + /// + /// The `reset_stream_duration` setting configures the max amount of time + /// this state will be maintained in memory. Once the duration elapses, the + /// stream state is purged from memory. + /// + /// Once the stream has been fully purged from memory, any additional frames + /// received for that stream will result in a connection level protocol + /// error, forcing the connection to terminate. + /// + /// The default value is 30 seconds. + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::server::*; + /// # use std::time::Duration; + /// # + /// # fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Handshake<T> + /// # { + /// // `server_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let server_fut = Builder::new() + /// .reset_stream_duration(Duration::from_secs(10)) + /// .handshake(my_io); + /// # server_fut + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn reset_stream_duration(&mut self, dur: Duration) -> &mut Self { + self.reset_stream_duration = dur; + self + } + + /// Enables the [extended CONNECT protocol]. + /// + /// [extended CONNECT protocol]: https://datatracker.ietf.org/doc/html/rfc8441#section-4 + pub fn enable_connect_protocol(&mut self) -> &mut Self { + self.settings.set_enable_connect_protocol(Some(1)); + self + } + + /// Creates a new configured HTTP/2 server backed by `io`. + /// + /// It is expected that `io` already be in an appropriate state to commence + /// the [HTTP/2 handshake]. See [Handshake] for more details. + /// + /// Returns a future which resolves to the [`Connection`] instance once the + /// HTTP/2 handshake has been completed. + /// + /// This function also allows the caller to configure the send payload data + /// type. See [Outbound data type] for more details. + /// + /// [HTTP/2 handshake]: http://httpwg.org/specs/rfc7540.html#ConnectionHeader + /// [Handshake]: ../index.html#handshake + /// [`Connection`]: struct.Connection.html + /// [Outbound data type]: ../index.html#outbound-data-type. + /// + /// # Examples + /// + /// Basic usage: + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::server::*; + /// # + /// # fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Handshake<T> + /// # { + /// // `server_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let server_fut = Builder::new() + /// .handshake(my_io); + /// # server_fut + /// # } + /// # + /// # pub fn main() {} + /// ``` + /// + /// Configures the send-payload data type. In this case, the outbound data + /// type will be `&'static [u8]`. + /// + /// ``` + /// # use tokio::io::{AsyncRead, AsyncWrite}; + /// # use h2::server::*; + /// # + /// # fn doc<T: AsyncRead + AsyncWrite + Unpin>(my_io: T) + /// # -> Handshake<T, &'static [u8]> + /// # { + /// // `server_fut` is a future representing the completion of the HTTP/2 + /// // handshake. + /// let server_fut: Handshake<_, &'static [u8]> = Builder::new() + /// .handshake(my_io); + /// # server_fut + /// # } + /// # + /// # pub fn main() {} + /// ``` + pub fn handshake<T, B>(&self, io: T) -> Handshake<T, B> + where + T: AsyncRead + AsyncWrite + Unpin, + B: Buf + 'static, + { + Connection::handshake2(io, self.clone()) + } +} + +impl Default for Builder { + fn default() -> Builder { + Builder::new() + } +} + +// ===== impl SendResponse ===== + +impl<B: Buf> SendResponse<B> { + /// Send a response to a client request. + /// + /// On success, a [`SendStream`] instance is returned. This instance can be + /// used to stream the response body and send trailers. + /// + /// If a body or trailers will be sent on the returned [`SendStream`] + /// instance, then `end_of_stream` must be set to `false` when calling this + /// function. + /// + /// The [`SendResponse`] instance is already associated with a received + /// request. This function may only be called once per instance and only if + /// [`send_reset`] has not been previously called. + /// + /// [`SendResponse`]: # + /// [`SendStream`]: ../struct.SendStream.html + /// [`send_reset`]: #method.send_reset + pub fn send_response( + &mut self, + response: Response<()>, + end_of_stream: bool, + ) -> Result<SendStream<B>, crate::Error> { + self.inner + .send_response(response, end_of_stream) + .map(|_| SendStream::new(self.inner.clone())) + .map_err(Into::into) + } + + /// Push a request and response to the client + /// + /// On success, a [`SendResponse`] instance is returned. + /// + /// [`SendResponse`]: # + pub fn push_request( + &mut self, + request: Request<()>, + ) -> Result<SendPushedResponse<B>, crate::Error> { + self.inner + .send_push_promise(request) + .map(|inner| SendPushedResponse { + inner: SendResponse { inner }, + }) + .map_err(Into::into) + } + + /// Send a stream reset to the peer. + /// + /// This essentially cancels the stream, including any inbound or outbound + /// data streams. + /// + /// If this function is called before [`send_response`], a call to + /// [`send_response`] will result in an error. + /// + /// If this function is called while a [`SendStream`] instance is active, + /// any further use of the instance will result in an error. + /// + /// This function should only be called once. + /// + /// [`send_response`]: #method.send_response + /// [`SendStream`]: ../struct.SendStream.html + pub fn send_reset(&mut self, reason: Reason) { + self.inner.send_reset(reason) + } + + /// Polls to be notified when the client resets this stream. + /// + /// If stream is still open, this returns `Poll::Pending`, and + /// registers the task to be notified if a `RST_STREAM` is received. + /// + /// If a `RST_STREAM` frame is received for this stream, calling this + /// method will yield the `Reason` for the reset. + /// + /// # Error + /// + /// Calling this method after having called `send_response` will return + /// a user error. + pub fn poll_reset(&mut self, cx: &mut Context) -> Poll<Result<Reason, crate::Error>> { + self.inner.poll_reset(cx, proto::PollReset::AwaitingHeaders) + } + + /// Returns the stream ID of the response stream. + /// + /// # Panics + /// + /// If the lock on the stream store has been poisoned. + pub fn stream_id(&self) -> crate::StreamId { + crate::StreamId::from_internal(self.inner.stream_id()) + } +} + +// ===== impl SendPushedResponse ===== + +impl<B: Buf> SendPushedResponse<B> { + /// Send a response to a promised request. + /// + /// On success, a [`SendStream`] instance is returned. This instance can be + /// used to stream the response body and send trailers. + /// + /// If a body or trailers will be sent on the returned [`SendStream`] + /// instance, then `end_of_stream` must be set to `false` when calling this + /// function. + /// + /// The [`SendPushedResponse`] instance is associated with a promised + /// request. This function may only be called once per instance and only if + /// [`send_reset`] has not been previously called. + /// + /// [`SendPushedResponse`]: # + /// [`SendStream`]: ../struct.SendStream.html + /// [`send_reset`]: #method.send_reset + pub fn send_response( + &mut self, + response: Response<()>, + end_of_stream: bool, + ) -> Result<SendStream<B>, crate::Error> { + self.inner.send_response(response, end_of_stream) + } + + /// Send a stream reset to the peer. + /// + /// This essentially cancels the stream, including any inbound or outbound + /// data streams. + /// + /// If this function is called before [`send_response`], a call to + /// [`send_response`] will result in an error. + /// + /// If this function is called while a [`SendStream`] instance is active, + /// any further use of the instance will result in an error. + /// + /// This function should only be called once. + /// + /// [`send_response`]: #method.send_response + /// [`SendStream`]: ../struct.SendStream.html + pub fn send_reset(&mut self, reason: Reason) { + self.inner.send_reset(reason) + } + + /// Polls to be notified when the client resets this stream. + /// + /// If stream is still open, this returns `Poll::Pending`, and + /// registers the task to be notified if a `RST_STREAM` is received. + /// + /// If a `RST_STREAM` frame is received for this stream, calling this + /// method will yield the `Reason` for the reset. + /// + /// # Error + /// + /// Calling this method after having called `send_response` will return + /// a user error. + pub fn poll_reset(&mut self, cx: &mut Context) -> Poll<Result<Reason, crate::Error>> { + self.inner.poll_reset(cx) + } + + /// Returns the stream ID of the response stream. + /// + /// # Panics + /// + /// If the lock on the stream store has been poisoned. + pub fn stream_id(&self) -> crate::StreamId { + self.inner.stream_id() + } +} + +// ===== impl Flush ===== + +impl<T, B: Buf> Flush<T, B> { + fn new(codec: Codec<T, B>) -> Self { + Flush { codec: Some(codec) } + } +} + +impl<T, B> Future for Flush<T, B> +where + T: AsyncWrite + Unpin, + B: Buf, +{ + type Output = Result<Codec<T, B>, crate::Error>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { + // Flush the codec + ready!(self.codec.as_mut().unwrap().flush(cx)).map_err(crate::Error::from_io)?; + + // Return the codec + Poll::Ready(Ok(self.codec.take().unwrap())) + } +} + +impl<T, B: Buf> ReadPreface<T, B> { + fn new(codec: Codec<T, B>) -> Self { + ReadPreface { + codec: Some(codec), + pos: 0, + } + } + + fn inner_mut(&mut self) -> &mut T { + self.codec.as_mut().unwrap().get_mut() + } +} + +impl<T, B> Future for ReadPreface<T, B> +where + T: AsyncRead + Unpin, + B: Buf, +{ + type Output = Result<Codec<T, B>, crate::Error>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { + let mut buf = [0; 24]; + let mut rem = PREFACE.len() - self.pos; + + while rem > 0 { + let mut buf = ReadBuf::new(&mut buf[..rem]); + ready!(Pin::new(self.inner_mut()).poll_read(cx, &mut buf)) + .map_err(crate::Error::from_io)?; + let n = buf.filled().len(); + if n == 0 { + return Poll::Ready(Err(crate::Error::from_io(io::Error::new( + io::ErrorKind::UnexpectedEof, + "connection closed before reading preface", + )))); + } + + if &PREFACE[self.pos..self.pos + n] != buf.filled() { + proto_err!(conn: "read_preface: invalid preface"); + // TODO: Should this just write the GO_AWAY frame directly? + return Poll::Ready(Err(Error::library_go_away(Reason::PROTOCOL_ERROR).into())); + } + + self.pos += n; + rem -= n; // TODO test + } + + Poll::Ready(Ok(self.codec.take().unwrap())) + } +} + +// ===== impl Handshake ===== + +impl<T, B: Buf> Future for Handshake<T, B> +where + T: AsyncRead + AsyncWrite + Unpin, + B: Buf + 'static, +{ + type Output = Result<Connection<T, B>, crate::Error>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { + let span = self.span.clone(); // XXX(eliza): T_T + let _e = span.enter(); + tracing::trace!(state = ?self.state); + + loop { + match &mut self.state { + Handshaking::Flushing(flush) => { + // We're currently flushing a pending SETTINGS frame. Poll the + // flush future, and, if it's completed, advance our state to wait + // for the client preface. + let codec = match Pin::new(flush).poll(cx)? { + Poll::Pending => { + tracing::trace!(flush.poll = %"Pending"); + return Poll::Pending; + } + Poll::Ready(flushed) => { + tracing::trace!(flush.poll = %"Ready"); + flushed + } + }; + self.state = Handshaking::ReadingPreface( + ReadPreface::new(codec).instrument(tracing::trace_span!("read_preface")), + ); + } + Handshaking::ReadingPreface(read) => { + let codec = ready!(Pin::new(read).poll(cx)?); + + self.state = Handshaking::Done; + + let connection = proto::Connection::new( + codec, + Config { + next_stream_id: 2.into(), + // Server does not need to locally initiate any streams + initial_max_send_streams: 0, + max_send_buffer_size: self.builder.max_send_buffer_size, + reset_stream_duration: self.builder.reset_stream_duration, + reset_stream_max: self.builder.reset_stream_max, + settings: self.builder.settings.clone(), + }, + ); + + tracing::trace!("connection established!"); + let mut c = Connection { connection }; + if let Some(sz) = self.builder.initial_target_connection_window_size { + c.set_target_window_size(sz); + } + + return Poll::Ready(Ok(c)); + } + Handshaking::Done => { + panic!("Handshaking::poll() called again after handshaking was complete") + } + } + } + } +} + +impl<T, B> fmt::Debug for Handshake<T, B> +where + T: AsyncRead + AsyncWrite + fmt::Debug, + B: fmt::Debug + Buf, +{ + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + write!(fmt, "server::Handshake") + } +} + +impl Peer { + pub fn convert_send_message( + id: StreamId, + response: Response<()>, + end_of_stream: bool, + ) -> frame::Headers { + use http::response::Parts; + + // Extract the components of the HTTP request + let ( + Parts { + status, headers, .. + }, + _, + ) = response.into_parts(); + + // Build the set pseudo header set. All requests will include `method` + // and `path`. + let pseudo = Pseudo::response(status); + + // Create the HEADERS frame + let mut frame = frame::Headers::new(id, pseudo, headers); + + if end_of_stream { + frame.set_end_stream() + } + + frame + } + + pub fn convert_push_message( + stream_id: StreamId, + promised_id: StreamId, + request: Request<()>, + ) -> Result<frame::PushPromise, UserError> { + use http::request::Parts; + + if let Err(e) = frame::PushPromise::validate_request(&request) { + use PushPromiseHeaderError::*; + match e { + NotSafeAndCacheable => tracing::debug!( + ?promised_id, + "convert_push_message: method {} is not safe and cacheable", + request.method(), + ), + InvalidContentLength(e) => tracing::debug!( + ?promised_id, + "convert_push_message; promised request has invalid content-length {:?}", + e, + ), + } + return Err(UserError::MalformedHeaders); + } + + // Extract the components of the HTTP request + let ( + Parts { + method, + uri, + headers, + .. + }, + _, + ) = request.into_parts(); + + let pseudo = Pseudo::request(method, uri, None); + + Ok(frame::PushPromise::new( + stream_id, + promised_id, + pseudo, + headers, + )) + } +} + +impl proto::Peer for Peer { + type Poll = Request<()>; + + const NAME: &'static str = "Server"; + + fn is_server() -> bool { + true + } + + fn r#dyn() -> proto::DynPeer { + proto::DynPeer::Server + } + + fn convert_poll_message( + pseudo: Pseudo, + fields: HeaderMap, + stream_id: StreamId, + ) -> Result<Self::Poll, Error> { + use http::{uri, Version}; + + let mut b = Request::builder(); + + macro_rules! malformed { + ($($arg:tt)*) => {{ + tracing::debug!($($arg)*); + return Err(Error::library_reset(stream_id, Reason::PROTOCOL_ERROR)); + }} + } + + b = b.version(Version::HTTP_2); + + let is_connect; + if let Some(method) = pseudo.method { + is_connect = method == Method::CONNECT; + b = b.method(method); + } else { + malformed!("malformed headers: missing method"); + } + + let has_protocol = pseudo.protocol.is_some(); + if !is_connect && has_protocol { + malformed!("malformed headers: :protocol on non-CONNECT request"); + } + + if pseudo.status.is_some() { + malformed!("malformed headers: :status field on request"); + } + + // Convert the URI + let mut parts = uri::Parts::default(); + + // A request translated from HTTP/1 must not include the :authority + // header + if let Some(authority) = pseudo.authority { + let maybe_authority = uri::Authority::from_maybe_shared(authority.clone().into_inner()); + parts.authority = Some(maybe_authority.or_else(|why| { + malformed!( + "malformed headers: malformed authority ({:?}): {}", + authority, + why, + ) + })?); + } + + // A :scheme is required, except CONNECT. + if let Some(scheme) = pseudo.scheme { + if is_connect && !has_protocol { + malformed!(":scheme in CONNECT"); + } + let maybe_scheme = scheme.parse(); + let scheme = maybe_scheme.or_else(|why| { + malformed!( + "malformed headers: malformed scheme ({:?}): {}", + scheme, + why, + ) + })?; + + // It's not possible to build an `Uri` from a scheme and path. So, + // after validating is was a valid scheme, we just have to drop it + // if there isn't an :authority. + if parts.authority.is_some() { + parts.scheme = Some(scheme); + } + } else if !is_connect || has_protocol { + malformed!("malformed headers: missing scheme"); + } + + if let Some(path) = pseudo.path { + if is_connect && !has_protocol { + malformed!(":path in CONNECT"); + } + + // This cannot be empty + if path.is_empty() { + malformed!("malformed headers: missing path"); + } + + let maybe_path = uri::PathAndQuery::from_maybe_shared(path.clone().into_inner()); + parts.path_and_query = Some(maybe_path.or_else(|why| { + malformed!("malformed headers: malformed path ({:?}): {}", path, why,) + })?); + } else if is_connect && has_protocol { + malformed!("malformed headers: missing path in extended CONNECT"); + } + + b = b.uri(parts); + + let mut request = match b.body(()) { + Ok(request) => request, + Err(e) => { + // TODO: Should there be more specialized handling for different + // kinds of errors + proto_err!(stream: "error building request: {}; stream={:?}", e, stream_id); + return Err(Error::library_reset(stream_id, Reason::PROTOCOL_ERROR)); + } + }; + + *request.headers_mut() = fields; + + Ok(request) + } +} + +// ===== impl Handshaking ===== + +impl<T, B> fmt::Debug for Handshaking<T, B> +where + B: Buf, +{ + #[inline] + fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> { + match *self { + Handshaking::Flushing(_) => f.write_str("Flushing(_)"), + Handshaking::ReadingPreface(_) => f.write_str("ReadingPreface(_)"), + Handshaking::Done => f.write_str("Done"), + } + } +} diff --git a/third_party/rust/h2/src/share.rs b/third_party/rust/h2/src/share.rs new file mode 100644 index 0000000000..f4e3cdeb0f --- /dev/null +++ b/third_party/rust/h2/src/share.rs @@ -0,0 +1,606 @@ +use crate::codec::UserError; +use crate::frame::Reason; +use crate::proto::{self, WindowSize}; + +use bytes::{Buf, Bytes}; +use http::HeaderMap; + +use std::fmt; +#[cfg(feature = "stream")] +use std::pin::Pin; +use std::task::{Context, Poll}; + +/// Sends the body stream and trailers to the remote peer. +/// +/// # Overview +/// +/// A `SendStream` is provided by [`SendRequest`] and [`SendResponse`] once the +/// HTTP/2 message header has been sent sent. It is used to stream the message +/// body and send the message trailers. See method level documentation for more +/// details. +/// +/// The `SendStream` instance is also used to manage outbound flow control. +/// +/// If a `SendStream` is dropped without explicitly closing the send stream, a +/// `RST_STREAM` frame will be sent. This essentially cancels the request / +/// response exchange. +/// +/// The ways to explicitly close the send stream are: +/// +/// * Set `end_of_stream` to true when calling [`send_request`], +/// [`send_response`], or [`send_data`]. +/// * Send trailers with [`send_trailers`]. +/// * Explicitly reset the stream with [`send_reset`]. +/// +/// # Flow control +/// +/// In HTTP/2, data cannot be sent to the remote peer unless there is +/// available window capacity on both the stream and the connection. When a data +/// frame is sent, both the stream window and the connection window are +/// decremented. When the stream level window reaches zero, no further data can +/// be sent on that stream. When the connection level window reaches zero, no +/// further data can be sent on any stream for that connection. +/// +/// When the remote peer is ready to receive more data, it sends `WINDOW_UPDATE` +/// frames. These frames increment the windows. See the [specification] for more +/// details on the principles of HTTP/2 flow control. +/// +/// The implications for sending data are that the caller **should** ensure that +/// both the stream and the connection has available window capacity before +/// loading the data to send into memory. The `SendStream` instance provides the +/// necessary APIs to perform this logic. This, however, is not an obligation. +/// If the caller attempts to send data on a stream when there is no available +/// window capacity, the library will buffer the data until capacity becomes +/// available, at which point the buffer will be flushed to the connection. +/// +/// **NOTE**: There is no bound on the amount of data that the library will +/// buffer. If you are sending large amounts of data, you really should hook +/// into the flow control lifecycle. Otherwise, you risk using up significant +/// amounts of memory. +/// +/// To hook into the flow control lifecycle, the caller signals to the library +/// that it intends to send data by calling [`reserve_capacity`], specifying the +/// amount of data, in octets, that the caller intends to send. After this, +/// `poll_capacity` is used to be notified when the requested capacity is +/// assigned to the stream. Once [`poll_capacity`] returns `Ready` with the number +/// of octets available to the stream, the caller is able to actually send the +/// data using [`send_data`]. +/// +/// Because there is also a connection level window that applies to **all** +/// streams on a connection, when capacity is assigned to a stream (indicated by +/// `poll_capacity` returning `Ready`), this capacity is reserved on the +/// connection and will **not** be assigned to any other stream. If data is +/// never written to the stream, that capacity is effectively lost to other +/// streams and this introduces the risk of deadlocking a connection. +/// +/// To avoid throttling data on a connection, the caller should not reserve +/// capacity until ready to send data and once any capacity is assigned to the +/// stream, the caller should immediately send data consuming this capacity. +/// There is no guarantee as to when the full capacity requested will become +/// available. For example, if the caller requests 64 KB of data and 512 bytes +/// become available, the caller should immediately send 512 bytes of data. +/// +/// See [`reserve_capacity`] documentation for more details. +/// +/// [`SendRequest`]: client/struct.SendRequest.html +/// [`SendResponse`]: server/struct.SendResponse.html +/// [specification]: http://httpwg.org/specs/rfc7540.html#FlowControl +/// [`reserve_capacity`]: #method.reserve_capacity +/// [`poll_capacity`]: #method.poll_capacity +/// [`send_data`]: #method.send_data +/// [`send_request`]: client/struct.SendRequest.html#method.send_request +/// [`send_response`]: server/struct.SendResponse.html#method.send_response +/// [`send_data`]: #method.send_data +/// [`send_trailers`]: #method.send_trailers +/// [`send_reset`]: #method.send_reset +#[derive(Debug)] +pub struct SendStream<B> { + inner: proto::StreamRef<B>, +} + +/// A stream identifier, as described in [Section 5.1.1] of RFC 7540. +/// +/// Streams are identified with an unsigned 31-bit integer. Streams +/// initiated by a client MUST use odd-numbered stream identifiers; those +/// initiated by the server MUST use even-numbered stream identifiers. A +/// stream identifier of zero (0x0) is used for connection control +/// messages; the stream identifier of zero cannot be used to establish a +/// new stream. +/// +/// [Section 5.1.1]: https://tools.ietf.org/html/rfc7540#section-5.1.1 +#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)] +pub struct StreamId(u32); + +impl From<StreamId> for u32 { + fn from(src: StreamId) -> Self { + src.0 + } +} + +/// Receives the body stream and trailers from the remote peer. +/// +/// A `RecvStream` is provided by [`client::ResponseFuture`] and +/// [`server::Connection`] with the received HTTP/2 message head (the response +/// and request head respectively). +/// +/// A `RecvStream` instance is used to receive the streaming message body and +/// any trailers from the remote peer. It is also used to manage inbound flow +/// control. +/// +/// See method level documentation for more details on receiving data. See +/// [`FlowControl`] for more details on inbound flow control. +/// +/// [`client::ResponseFuture`]: client/struct.ResponseFuture.html +/// [`server::Connection`]: server/struct.Connection.html +/// [`FlowControl`]: struct.FlowControl.html +/// [`Stream`]: https://docs.rs/futures/0.1/futures/stream/trait.Stream.html +#[must_use = "streams do nothing unless polled"] +pub struct RecvStream { + inner: FlowControl, +} + +/// A handle to release window capacity to a remote stream. +/// +/// This type allows the caller to manage inbound data [flow control]. The +/// caller is expected to call [`release_capacity`] after dropping data frames. +/// +/// # Overview +/// +/// Each stream has a window size. This window size is the maximum amount of +/// inbound data that can be in-flight. In-flight data is defined as data that +/// has been received, but not yet released. +/// +/// When a stream is created, the window size is set to the connection's initial +/// window size value. When a data frame is received, the window size is then +/// decremented by size of the data frame before the data is provided to the +/// caller. As the caller finishes using the data, [`release_capacity`] must be +/// called. This will then increment the window size again, allowing the peer to +/// send more data. +/// +/// There is also a connection level window as well as the stream level window. +/// Received data counts against the connection level window as well and calls +/// to [`release_capacity`] will also increment the connection level window. +/// +/// # Sending `WINDOW_UPDATE` frames +/// +/// `WINDOW_UPDATE` frames will not be sent out for **every** call to +/// `release_capacity`, as this would end up slowing down the protocol. Instead, +/// `h2` waits until the window size is increased to a certain threshold and +/// then sends out a single `WINDOW_UPDATE` frame representing all the calls to +/// `release_capacity` since the last `WINDOW_UPDATE` frame. +/// +/// This essentially batches window updating. +/// +/// # Scenarios +/// +/// Following is a basic scenario with an HTTP/2 connection containing a +/// single active stream. +/// +/// * A new stream is activated. The receive window is initialized to 1024 (the +/// value of the initial window size for this connection). +/// * A `DATA` frame is received containing a payload of 600 bytes. +/// * The receive window size is reduced to 424 bytes. +/// * [`release_capacity`] is called with 200. +/// * The receive window size is now 624 bytes. The peer may send no more than +/// this. +/// * A `DATA` frame is received with a payload of 624 bytes. +/// * The window size is now 0 bytes. The peer may not send any more data. +/// * [`release_capacity`] is called with 1024. +/// * The receive window size is now 1024 bytes. The peer may now send more +/// data. +/// +/// [flow control]: ../index.html#flow-control +/// [`release_capacity`]: struct.FlowControl.html#method.release_capacity +#[derive(Clone, Debug)] +pub struct FlowControl { + inner: proto::OpaqueStreamRef, +} + +/// A handle to send and receive PING frames with the peer. +// NOT Clone on purpose +pub struct PingPong { + inner: proto::UserPings, +} + +/// Sent via [`PingPong`][] to send a PING frame to a peer. +/// +/// [`PingPong`]: struct.PingPong.html +pub struct Ping { + _p: (), +} + +/// Received via [`PingPong`][] when a peer acknowledges a [`Ping`][]. +/// +/// [`PingPong`]: struct.PingPong.html +/// [`Ping`]: struct.Ping.html +pub struct Pong { + _p: (), +} + +// ===== impl SendStream ===== + +impl<B: Buf> SendStream<B> { + pub(crate) fn new(inner: proto::StreamRef<B>) -> Self { + SendStream { inner } + } + + /// Requests capacity to send data. + /// + /// This function is used to express intent to send data. This requests + /// connection level capacity. Once the capacity is available, it is + /// assigned to the stream and not reused by other streams. + /// + /// This function may be called repeatedly. The `capacity` argument is the + /// **total** amount of requested capacity. Sequential calls to + /// `reserve_capacity` are *not* additive. Given the following: + /// + /// ```rust + /// # use h2::*; + /// # fn doc(mut send_stream: SendStream<&'static [u8]>) { + /// send_stream.reserve_capacity(100); + /// send_stream.reserve_capacity(200); + /// # } + /// ``` + /// + /// After the second call to `reserve_capacity`, the *total* requested + /// capacity will be 200. + /// + /// `reserve_capacity` is also used to cancel previous capacity requests. + /// Given the following: + /// + /// ```rust + /// # use h2::*; + /// # fn doc(mut send_stream: SendStream<&'static [u8]>) { + /// send_stream.reserve_capacity(100); + /// send_stream.reserve_capacity(0); + /// # } + /// ``` + /// + /// After the second call to `reserve_capacity`, the *total* requested + /// capacity will be 0, i.e. there is no requested capacity for the stream. + /// + /// If `reserve_capacity` is called with a lower value than the amount of + /// capacity **currently** assigned to the stream, this capacity will be + /// returned to the connection to be re-assigned to other streams. + /// + /// Also, the amount of capacity that is reserved gets decremented as data + /// is sent. For example: + /// + /// ```rust + /// # use h2::*; + /// # async fn doc(mut send_stream: SendStream<&'static [u8]>) { + /// send_stream.reserve_capacity(100); + /// + /// send_stream.send_data(b"hello", false).unwrap(); + /// // At this point, the total amount of requested capacity is 95 bytes. + /// + /// // Calling `reserve_capacity` with `100` again essentially requests an + /// // additional 5 bytes. + /// send_stream.reserve_capacity(100); + /// # } + /// ``` + /// + /// See [Flow control](struct.SendStream.html#flow-control) for an overview + /// of how send flow control works. + pub fn reserve_capacity(&mut self, capacity: usize) { + // TODO: Check for overflow + self.inner.reserve_capacity(capacity as WindowSize) + } + + /// Returns the stream's current send capacity. + /// + /// This allows the caller to check the current amount of available capacity + /// before sending data. + pub fn capacity(&self) -> usize { + self.inner.capacity() as usize + } + + /// Requests to be notified when the stream's capacity increases. + /// + /// Before calling this, capacity should be requested with + /// `reserve_capacity`. Once capacity is requested, the connection will + /// assign capacity to the stream **as it becomes available**. There is no + /// guarantee as to when and in what increments capacity gets assigned to + /// the stream. + /// + /// To get notified when the available capacity increases, the caller calls + /// `poll_capacity`, which returns `Ready(Some(n))` when `n` has been + /// increased by the connection. Note that `n` here represents the **total** + /// amount of assigned capacity at that point in time. It is also possible + /// that `n` is lower than the previous call if, since then, the caller has + /// sent data. + pub fn poll_capacity(&mut self, cx: &mut Context) -> Poll<Option<Result<usize, crate::Error>>> { + self.inner + .poll_capacity(cx) + .map_ok(|w| w as usize) + .map_err(Into::into) + } + + /// Sends a single data frame to the remote peer. + /// + /// This function may be called repeatedly as long as `end_of_stream` is set + /// to `false`. Setting `end_of_stream` to `true` sets the end stream flag + /// on the data frame. Any further calls to `send_data` or `send_trailers` + /// will return an [`Error`]. + /// + /// `send_data` can be called without reserving capacity. In this case, the + /// data is buffered and the capacity is implicitly requested. Once the + /// capacity becomes available, the data is flushed to the connection. + /// However, this buffering is unbounded. As such, sending large amounts of + /// data without reserving capacity before hand could result in large + /// amounts of data being buffered in memory. + /// + /// [`Error`]: struct.Error.html + pub fn send_data(&mut self, data: B, end_of_stream: bool) -> Result<(), crate::Error> { + self.inner + .send_data(data, end_of_stream) + .map_err(Into::into) + } + + /// Sends trailers to the remote peer. + /// + /// Sending trailers implicitly closes the send stream. Once the send stream + /// is closed, no more data can be sent. + pub fn send_trailers(&mut self, trailers: HeaderMap) -> Result<(), crate::Error> { + self.inner.send_trailers(trailers).map_err(Into::into) + } + + /// Resets the stream. + /// + /// This cancels the request / response exchange. If the response has not + /// yet been received, the associated `ResponseFuture` will return an + /// [`Error`] to reflect the canceled exchange. + /// + /// [`Error`]: struct.Error.html + pub fn send_reset(&mut self, reason: Reason) { + self.inner.send_reset(reason) + } + + /// Polls to be notified when the client resets this stream. + /// + /// If stream is still open, this returns `Poll::Pending`, and + /// registers the task to be notified if a `RST_STREAM` is received. + /// + /// If a `RST_STREAM` frame is received for this stream, calling this + /// method will yield the `Reason` for the reset. + /// + /// # Error + /// + /// If connection sees an error, this returns that error instead of a + /// `Reason`. + pub fn poll_reset(&mut self, cx: &mut Context) -> Poll<Result<Reason, crate::Error>> { + self.inner.poll_reset(cx, proto::PollReset::Streaming) + } + + /// Returns the stream ID of this `SendStream`. + /// + /// # Panics + /// + /// If the lock on the stream store has been poisoned. + pub fn stream_id(&self) -> StreamId { + StreamId::from_internal(self.inner.stream_id()) + } +} + +// ===== impl StreamId ===== + +impl StreamId { + pub(crate) fn from_internal(id: crate::frame::StreamId) -> Self { + StreamId(id.into()) + } + + /// Returns the `u32` corresponding to this `StreamId` + /// + /// # Note + /// + /// This is the same as the `From<StreamId>` implementation, but + /// included as an inherent method because that implementation doesn't + /// appear in rustdocs, as well as a way to force the type instead of + /// relying on inference. + pub fn as_u32(&self) -> u32 { + (*self).into() + } +} +// ===== impl RecvStream ===== + +impl RecvStream { + pub(crate) fn new(inner: FlowControl) -> Self { + RecvStream { inner } + } + + /// Get the next data frame. + pub async fn data(&mut self) -> Option<Result<Bytes, crate::Error>> { + futures_util::future::poll_fn(move |cx| self.poll_data(cx)).await + } + + /// Get optional trailers for this stream. + pub async fn trailers(&mut self) -> Result<Option<HeaderMap>, crate::Error> { + futures_util::future::poll_fn(move |cx| self.poll_trailers(cx)).await + } + + /// Poll for the next data frame. + pub fn poll_data(&mut self, cx: &mut Context<'_>) -> Poll<Option<Result<Bytes, crate::Error>>> { + self.inner.inner.poll_data(cx).map_err(Into::into) + } + + #[doc(hidden)] + pub fn poll_trailers( + &mut self, + cx: &mut Context, + ) -> Poll<Result<Option<HeaderMap>, crate::Error>> { + match ready!(self.inner.inner.poll_trailers(cx)) { + Some(Ok(map)) => Poll::Ready(Ok(Some(map))), + Some(Err(e)) => Poll::Ready(Err(e.into())), + None => Poll::Ready(Ok(None)), + } + } + + /// Returns true if the receive half has reached the end of stream. + /// + /// A return value of `true` means that calls to `poll` and `poll_trailers` + /// will both return `None`. + pub fn is_end_stream(&self) -> bool { + self.inner.inner.is_end_stream() + } + + /// Get a mutable reference to this stream's `FlowControl`. + /// + /// It can be used immediately, or cloned to be used later. + pub fn flow_control(&mut self) -> &mut FlowControl { + &mut self.inner + } + + /// Returns the stream ID of this stream. + /// + /// # Panics + /// + /// If the lock on the stream store has been poisoned. + pub fn stream_id(&self) -> StreamId { + self.inner.stream_id() + } +} + +#[cfg(feature = "stream")] +impl futures_core::Stream for RecvStream { + type Item = Result<Bytes, crate::Error>; + + fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> { + self.poll_data(cx) + } +} + +impl fmt::Debug for RecvStream { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + fmt.debug_struct("RecvStream") + .field("inner", &self.inner) + .finish() + } +} + +impl Drop for RecvStream { + fn drop(&mut self) { + // Eagerly clear any received DATA frames now, since its no longer + // possible to retrieve them. However, this will be called + // again once *all* stream refs have been dropped, since + // this won't send a RST_STREAM frame, in case the user wishes to + // still *send* DATA. + self.inner.inner.clear_recv_buffer(); + } +} + +// ===== impl FlowControl ===== + +impl FlowControl { + pub(crate) fn new(inner: proto::OpaqueStreamRef) -> Self { + FlowControl { inner } + } + + /// Returns the stream ID of the stream whose capacity will + /// be released by this `FlowControl`. + pub fn stream_id(&self) -> StreamId { + StreamId::from_internal(self.inner.stream_id()) + } + + /// Get the current available capacity of data this stream *could* receive. + pub fn available_capacity(&self) -> isize { + self.inner.available_recv_capacity() + } + + /// Get the currently *used* capacity for this stream. + /// + /// This is the amount of bytes that can be released back to the remote. + pub fn used_capacity(&self) -> usize { + self.inner.used_recv_capacity() as usize + } + + /// Release window capacity back to remote stream. + /// + /// This releases capacity back to the stream level and the connection level + /// windows. Both window sizes will be increased by `sz`. + /// + /// See [struct level] documentation for more details. + /// + /// # Errors + /// + /// This function errors if increasing the receive window size by `sz` would + /// result in a window size greater than the target window size. In other + /// words, the caller cannot release more capacity than data has been + /// received. If 1024 bytes of data have been received, at most 1024 bytes + /// can be released. + /// + /// [struct level]: # + pub fn release_capacity(&mut self, sz: usize) -> Result<(), crate::Error> { + if sz > proto::MAX_WINDOW_SIZE as usize { + return Err(UserError::ReleaseCapacityTooBig.into()); + } + self.inner + .release_capacity(sz as proto::WindowSize) + .map_err(Into::into) + } +} + +// ===== impl PingPong ===== + +impl PingPong { + pub(crate) fn new(inner: proto::UserPings) -> Self { + PingPong { inner } + } + + /// Send a PING frame and wait for the peer to send the pong. + pub async fn ping(&mut self, ping: Ping) -> Result<Pong, crate::Error> { + self.send_ping(ping)?; + futures_util::future::poll_fn(|cx| self.poll_pong(cx)).await + } + + #[doc(hidden)] + pub fn send_ping(&mut self, ping: Ping) -> Result<(), crate::Error> { + // Passing a `Ping` here is just to be forwards-compatible with + // eventually allowing choosing a ping payload. For now, we can + // just drop it. + drop(ping); + + self.inner.send_ping().map_err(|err| match err { + Some(err) => err.into(), + None => UserError::SendPingWhilePending.into(), + }) + } + + #[doc(hidden)] + pub fn poll_pong(&mut self, cx: &mut Context) -> Poll<Result<Pong, crate::Error>> { + ready!(self.inner.poll_pong(cx))?; + Poll::Ready(Ok(Pong { _p: () })) + } +} + +impl fmt::Debug for PingPong { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + fmt.debug_struct("PingPong").finish() + } +} + +// ===== impl Ping ===== + +impl Ping { + /// Creates a new opaque `Ping` to be sent via a [`PingPong`][]. + /// + /// The payload is "opaque", such that it shouldn't be depended on. + /// + /// [`PingPong`]: struct.PingPong.html + pub fn opaque() -> Ping { + Ping { _p: () } + } +} + +impl fmt::Debug for Ping { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + fmt.debug_struct("Ping").finish() + } +} + +// ===== impl Pong ===== + +impl fmt::Debug for Pong { + fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + fmt.debug_struct("Pong").finish() + } +} |