| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.3.19/src/proto/connection.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>connection.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../h2/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../h2/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::codec::UserError; |
| <span class="kw">use </span><span class="kw">crate</span>::frame::{Reason, StreamId}; |
| <span class="kw">use crate</span>::{client, frame, server}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::frame::DEFAULT_INITIAL_WINDOW_SIZE; |
| <span class="kw">use </span><span class="kw">crate</span>::proto::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span>bytes::{Buf, Bytes}; |
| <span class="kw">use </span>futures_core::Stream; |
| <span class="kw">use </span>std::io; |
| <span class="kw">use </span>std::marker::PhantomData; |
| <span class="kw">use </span>std::pin::Pin; |
| <span class="kw">use </span>std::task::{Context, Poll}; |
| <span class="kw">use </span>std::time::Duration; |
| <span class="kw">use </span>tokio::io::{AsyncRead, AsyncWrite}; |
| |
| <span class="doccomment">/// An H2 connection |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Connection<T, P, B: Buf = Bytes> |
| <span class="kw">where |
| </span>P: Peer, |
| { |
| <span class="doccomment">/// Read / write frame values |
| </span>codec: Codec<T, Prioritized<B>>, |
| |
| inner: ConnectionInner<P, B>, |
| } |
| |
| <span class="comment">// Extracted part of `Connection` which does not depend on `T`. Reduces the amount of duplicated |
| // method instantiations. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>ConnectionInner<P, B: Buf = Bytes> |
| <span class="kw">where |
| </span>P: Peer, |
| { |
| <span class="doccomment">/// Tracks the connection level state transitions. |
| </span>state: State, |
| |
| <span class="doccomment">/// An error to report back once complete. |
| /// |
| /// This exists separately from State in order to support |
| /// graceful shutdown. |
| </span>error: <span class="prelude-ty">Option</span><frame::GoAway>, |
| |
| <span class="doccomment">/// Pending GOAWAY frames to write. |
| </span>go_away: GoAway, |
| |
| <span class="doccomment">/// Ping/pong handler |
| </span>ping_pong: PingPong, |
| |
| <span class="doccomment">/// Connection settings |
| </span>settings: Settings, |
| |
| <span class="doccomment">/// Stream state handler |
| </span>streams: Streams<B, P>, |
| |
| <span class="doccomment">/// A `tracing` span tracking the lifetime of the connection. |
| </span>span: tracing::Span, |
| |
| <span class="doccomment">/// Client or server |
| </span>_phantom: PhantomData<P>, |
| } |
| |
| <span class="kw">struct </span>DynConnection<<span class="lifetime">'a</span>, B: Buf = Bytes> { |
| state: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>State, |
| |
| go_away: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>GoAway, |
| |
| streams: DynStreams<<span class="lifetime">'a</span>, B>, |
| |
| error: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="prelude-ty">Option</span><frame::GoAway>, |
| |
| ping_pong: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>PingPong, |
| } |
| |
| <span class="attribute">#[derive(Debug, Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Config { |
| <span class="kw">pub </span>next_stream_id: StreamId, |
| <span class="kw">pub </span>initial_max_send_streams: usize, |
| <span class="kw">pub </span>max_send_buffer_size: usize, |
| <span class="kw">pub </span>reset_stream_duration: Duration, |
| <span class="kw">pub </span>reset_stream_max: usize, |
| <span class="kw">pub </span>remote_reset_stream_max: usize, |
| <span class="kw">pub </span>settings: frame::Settings, |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">enum </span>State { |
| <span class="doccomment">/// Currently open in a sane state |
| </span>Open, |
| |
| <span class="doccomment">/// The codec must be flushed |
| </span>Closing(Reason, Initiator), |
| |
| <span class="doccomment">/// In a closed state |
| </span>Closed(Reason, Initiator), |
| } |
| |
| <span class="kw">impl</span><T, P, B> Connection<T, P, B> |
| <span class="kw">where |
| </span>T: AsyncRead + AsyncWrite + Unpin, |
| P: Peer, |
| B: Buf, |
| { |
| <span class="kw">pub fn </span>new(codec: Codec<T, Prioritized<B>>, config: Config) -> Connection<T, P, B> { |
| <span class="kw">fn </span>streams_config(config: <span class="kw-2">&</span>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(<span class="bool-val">true</span>), |
| extended_connect_protocol_enabled: config |
| .settings |
| .is_extended_connect_protocol_enabled() |
| .unwrap_or(<span class="bool-val">false</span>), |
| local_reset_duration: config.reset_stream_duration, |
| local_reset_max: config.reset_stream_max, |
| remote_reset_max: config.remote_reset_stream_max, |
| remote_init_window_sz: DEFAULT_INITIAL_WINDOW_SIZE, |
| remote_max_initiated: config |
| .settings |
| .max_concurrent_streams() |
| .map(|max| max <span class="kw">as </span>usize), |
| } |
| } |
| <span class="kw">let </span>streams = Streams::new(streams_config(<span class="kw-2">&</span>config)); |
| Connection { |
| codec, |
| inner: ConnectionInner { |
| state: State::Open, |
| error: <span class="prelude-val">None</span>, |
| go_away: GoAway::new(), |
| ping_pong: PingPong::new(), |
| settings: Settings::new(config.settings), |
| streams, |
| span: <span class="macro">tracing::debug_span!</span>(<span class="string">"Connection"</span>, peer = %P::NAME), |
| _phantom: PhantomData, |
| }, |
| } |
| } |
| |
| <span class="doccomment">/// connection flow control |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_target_window_size(<span class="kw-2">&mut </span><span class="self">self</span>, size: WindowSize) { |
| <span class="self">self</span>.inner.streams.set_target_connection_window_size(size); |
| } |
| |
| <span class="doccomment">/// Send a new SETTINGS frame with an updated initial window size. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_initial_window_size(<span class="kw-2">&mut </span><span class="self">self</span>, size: WindowSize) -> <span class="prelude-ty">Result</span><(), UserError> { |
| <span class="kw">let </span><span class="kw-2">mut </span>settings = frame::Settings::default(); |
| settings.set_initial_window_size(<span class="prelude-val">Some</span>(size)); |
| <span class="self">self</span>.inner.settings.send_settings(settings) |
| } |
| |
| <span class="doccomment">/// Send a new SETTINGS frame with extended CONNECT protocol enabled. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_enable_connect_protocol(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><(), UserError> { |
| <span class="kw">let </span><span class="kw-2">mut </span>settings = frame::Settings::default(); |
| settings.set_enable_connect_protocol(<span class="prelude-val">Some</span>(<span class="number">1</span>)); |
| <span class="self">self</span>.inner.settings.send_settings(settings) |
| } |
| |
| <span class="doccomment">/// Returns the maximum number of concurrent streams that may be initiated |
| /// by this peer. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>max_send_streams(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.streams.max_send_streams() |
| } |
| |
| <span class="doccomment">/// Returns the maximum number of concurrent streams that may be initiated |
| /// by the remote peer. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>max_recv_streams(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.streams.max_recv_streams() |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unstable"</span>)] |
| </span><span class="kw">pub fn </span>num_wired_streams(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.streams.num_wired_streams() |
| } |
| |
| <span class="doccomment">/// 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. |
| </span><span class="kw">fn </span>poll_ready(<span class="kw-2">&mut </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>Context) -> Poll<<span class="prelude-ty">Result</span><(), Error>> { |
| <span class="kw">let </span>_e = <span class="self">self</span>.inner.span.enter(); |
| <span class="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(<span class="string">"poll_ready"</span>); |
| <span class="kw">let </span>_e = span.enter(); |
| <span class="comment">// The order of these calls don't really matter too much |
| </span><span class="macro">ready!</span>(<span class="self">self</span>.inner.ping_pong.send_pending_pong(cx, <span class="kw-2">&mut </span><span class="self">self</span>.codec))<span class="question-mark">?</span>; |
| <span class="macro">ready!</span>(<span class="self">self</span>.inner.ping_pong.send_pending_ping(cx, <span class="kw-2">&mut </span><span class="self">self</span>.codec))<span class="question-mark">?</span>; |
| <span class="macro">ready!</span>(<span class="self">self |
| </span>.inner |
| .settings |
| .poll_send(cx, <span class="kw-2">&mut </span><span class="self">self</span>.codec, <span class="kw-2">&mut </span><span class="self">self</span>.inner.streams))<span class="question-mark">?</span>; |
| <span class="macro">ready!</span>(<span class="self">self</span>.inner.streams.send_pending_refusal(cx, <span class="kw-2">&mut </span><span class="self">self</span>.codec))<span class="question-mark">?</span>; |
| |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } |
| |
| <span class="doccomment">/// 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`. |
| </span><span class="kw">fn </span>poll_go_away(<span class="kw-2">&mut </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>Context) -> Poll<<span class="prelude-ty">Option</span><io::Result<Reason>>> { |
| <span class="self">self</span>.inner.go_away.send_pending_go_away(cx, <span class="kw-2">&mut </span><span class="self">self</span>.codec) |
| } |
| |
| <span class="kw">pub fn </span>go_away_from_user(<span class="kw-2">&mut </span><span class="self">self</span>, e: Reason) { |
| <span class="self">self</span>.inner.as_dyn().go_away_from_user(e) |
| } |
| |
| <span class="kw">fn </span>take_error(<span class="kw-2">&mut </span><span class="self">self</span>, ours: Reason, initiator: Initiator) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="kw">let </span>(debug_data, theirs) = <span class="self">self |
| </span>.inner |
| .error |
| .take() |
| .as_ref() |
| .map_or((Bytes::new(), Reason::NO_ERROR), |frame| { |
| (frame.debug_data().clone(), frame.reason()) |
| }); |
| |
| <span class="kw">match </span>(ours, theirs) { |
| (Reason::NO_ERROR, Reason::NO_ERROR) => <span class="prelude-val">Ok</span>(()), |
| (ours, Reason::NO_ERROR) => <span class="prelude-val">Err</span>(Error::GoAway(Bytes::new(), ours, initiator)), |
| <span class="comment">// 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. |
| </span>(<span class="kw">_</span>, theirs) => <span class="prelude-val">Err</span>(Error::remote_go_away(debug_data, theirs)), |
| } |
| } |
| |
| <span class="doccomment">/// Closes the connection by transitioning to a GOAWAY state |
| /// iff there are no streams or references |
| </span><span class="kw">pub fn </span>maybe_close_connection_if_no_streams(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// If we poll() and realize that there are no streams or references |
| // then we can close the connection by transitioning to GOAWAY |
| </span><span class="kw">if </span>!<span class="self">self</span>.inner.streams.has_streams_or_other_references() { |
| <span class="self">self</span>.inner.as_dyn().go_away_now(Reason::NO_ERROR); |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>take_user_pings(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><UserPings> { |
| <span class="self">self</span>.inner.ping_pong.take_user_pings() |
| } |
| |
| <span class="doccomment">/// Advances the internal state of the connection. |
| </span><span class="kw">pub fn </span>poll(<span class="kw-2">&mut </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>Context) -> Poll<<span class="prelude-ty">Result</span><(), Error>> { |
| <span class="comment">// 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. |
| </span><span class="kw">let </span>span = <span class="self">self</span>.inner.span.clone(); |
| <span class="kw">let </span>_e = span.enter(); |
| <span class="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(<span class="string">"poll"</span>); |
| <span class="kw">let </span>_e = span.enter(); |
| |
| <span class="kw">loop </span>{ |
| <span class="macro">tracing::trace!</span>(connection.state = <span class="question-mark">?</span><span class="self">self</span>.inner.state); |
| <span class="comment">// TODO: probably clean up this glob of code |
| </span><span class="kw">match </span><span class="self">self</span>.inner.state { |
| <span class="comment">// When open, continue to poll a frame |
| </span>State::Open => { |
| <span class="kw">let </span>result = <span class="kw">match </span><span class="self">self</span>.poll2(cx) { |
| Poll::Ready(result) => result, |
| <span class="comment">// The connection is not ready to make progress |
| </span>Poll::Pending => { |
| <span class="comment">// Ensure all window updates have been sent. |
| // |
| // This will also handle flushing `self.codec` |
| </span><span class="macro">ready!</span>(<span class="self">self</span>.inner.streams.poll_complete(cx, <span class="kw-2">&mut </span><span class="self">self</span>.codec))<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span>(<span class="self">self</span>.inner.error.is_some() |
| || <span class="self">self</span>.inner.go_away.should_close_on_idle()) |
| && !<span class="self">self</span>.inner.streams.has_streams() |
| { |
| <span class="self">self</span>.inner.as_dyn().go_away_now(Reason::NO_ERROR); |
| <span class="kw">continue</span>; |
| } |
| |
| <span class="kw">return </span>Poll::Pending; |
| } |
| }; |
| |
| <span class="self">self</span>.inner.as_dyn().handle_poll2_result(result)<span class="question-mark">? |
| </span>} |
| State::Closing(reason, initiator) => { |
| <span class="macro">tracing::trace!</span>(<span class="string">"connection closing after flush"</span>); |
| <span class="comment">// Flush/shutdown the codec |
| </span><span class="macro">ready!</span>(<span class="self">self</span>.codec.shutdown(cx))<span class="question-mark">?</span>; |
| |
| <span class="comment">// Transition the state to error |
| </span><span class="self">self</span>.inner.state = State::Closed(reason, initiator); |
| } |
| State::Closed(reason, initiator) => { |
| <span class="kw">return </span>Poll::Ready(<span class="self">self</span>.take_error(reason, initiator)); |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>poll2(<span class="kw-2">&mut </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>Context) -> Poll<<span class="prelude-ty">Result</span><(), Error>> { |
| <span class="comment">// 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). |
| </span><span class="self">self</span>.clear_expired_reset_streams(); |
| |
| <span class="kw">loop </span>{ |
| <span class="comment">// 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 |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(reason) = <span class="macro">ready!</span>(<span class="self">self</span>.poll_go_away(cx)<span class="question-mark">?</span>) { |
| <span class="kw">if </span><span class="self">self</span>.inner.go_away.should_close_now() { |
| <span class="kw">if </span><span class="self">self</span>.inner.go_away.is_user_initiated() { |
| <span class="comment">// A user initiated abrupt shutdown shouldn't return |
| // the same error back to the user. |
| </span><span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(())); |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(Error::library_go_away(reason))); |
| } |
| } |
| <span class="comment">// Only NO_ERROR should be waiting for idle |
| </span><span class="macro">debug_assert_eq!</span>( |
| reason, |
| Reason::NO_ERROR, |
| <span class="string">"graceful GOAWAY should be NO_ERROR" |
| </span>); |
| } |
| <span class="macro">ready!</span>(<span class="self">self</span>.poll_ready(cx))<span class="question-mark">?</span>; |
| |
| <span class="kw">match </span><span class="self">self |
| </span>.inner |
| .as_dyn() |
| .recv_frame(<span class="macro">ready!</span>(Pin::new(<span class="kw-2">&mut </span><span class="self">self</span>.codec).poll_next(cx)<span class="question-mark">?</span>))<span class="question-mark">? |
| </span>{ |
| ReceivedFrame::Settings(frame) => { |
| <span class="self">self</span>.inner.settings.recv_settings( |
| frame, |
| <span class="kw-2">&mut </span><span class="self">self</span>.codec, |
| <span class="kw-2">&mut </span><span class="self">self</span>.inner.streams, |
| )<span class="question-mark">?</span>; |
| } |
| ReceivedFrame::Continue => (), |
| ReceivedFrame::Done => { |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(())); |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>clear_expired_reset_streams(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.inner.streams.clear_expired_reset_streams(); |
| } |
| } |
| |
| <span class="kw">impl</span><P, B> ConnectionInner<P, B> |
| <span class="kw">where |
| </span>P: Peer, |
| B: Buf, |
| { |
| <span class="kw">fn </span>as_dyn(<span class="kw-2">&mut </span><span class="self">self</span>) -> DynConnection<<span class="lifetime">'_</span>, B> { |
| <span class="kw">let </span>ConnectionInner { |
| state, |
| go_away, |
| streams, |
| error, |
| ping_pong, |
| .. |
| } = <span class="self">self</span>; |
| <span class="kw">let </span>streams = streams.as_dyn(); |
| DynConnection { |
| state, |
| go_away, |
| streams, |
| error, |
| ping_pong, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><B> DynConnection<<span class="lifetime">'_</span>, B> |
| <span class="kw">where |
| </span>B: Buf, |
| { |
| <span class="kw">fn </span>go_away(<span class="kw-2">&mut </span><span class="self">self</span>, id: StreamId, e: Reason) { |
| <span class="kw">let </span>frame = frame::GoAway::new(id, e); |
| <span class="self">self</span>.streams.send_go_away(id); |
| <span class="self">self</span>.go_away.go_away(frame); |
| } |
| |
| <span class="kw">fn </span>go_away_now(<span class="kw-2">&mut </span><span class="self">self</span>, e: Reason) { |
| <span class="kw">let </span>last_processed_id = <span class="self">self</span>.streams.last_processed_id(); |
| <span class="kw">let </span>frame = frame::GoAway::new(last_processed_id, e); |
| <span class="self">self</span>.go_away.go_away_now(frame); |
| } |
| |
| <span class="kw">fn </span>go_away_now_data(<span class="kw-2">&mut </span><span class="self">self</span>, e: Reason, data: Bytes) { |
| <span class="kw">let </span>last_processed_id = <span class="self">self</span>.streams.last_processed_id(); |
| <span class="kw">let </span>frame = frame::GoAway::with_debug_data(last_processed_id, e, data); |
| <span class="self">self</span>.go_away.go_away_now(frame); |
| } |
| |
| <span class="kw">fn </span>go_away_from_user(<span class="kw-2">&mut </span><span class="self">self</span>, e: Reason) { |
| <span class="kw">let </span>last_processed_id = <span class="self">self</span>.streams.last_processed_id(); |
| <span class="kw">let </span>frame = frame::GoAway::new(last_processed_id, e); |
| <span class="self">self</span>.go_away.go_away_from_user(frame); |
| |
| <span class="comment">// Notify all streams of reason we're abruptly closing. |
| </span><span class="self">self</span>.streams.handle_error(Error::user_go_away(e)); |
| } |
| |
| <span class="kw">fn </span>handle_poll2_result(<span class="kw-2">&mut </span><span class="self">self</span>, result: <span class="prelude-ty">Result</span><(), Error>) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="kw">match </span>result { |
| <span class="comment">// The connection has shutdown normally |
| </span><span class="prelude-val">Ok</span>(()) => { |
| <span class="kw-2">*</span><span class="self">self</span>.state = State::Closing(Reason::NO_ERROR, Initiator::Library); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="comment">// Attempting to read a frame resulted in a connection level |
| // error. This is handled by setting a GOAWAY frame followed by |
| // terminating the connection. |
| </span><span class="prelude-val">Err</span>(Error::GoAway(debug_data, reason, initiator)) => { |
| <span class="kw">let </span>e = Error::GoAway(debug_data.clone(), reason, initiator); |
| <span class="macro">tracing::debug!</span>(error = <span class="question-mark">?</span>e, <span class="string">"Connection::poll; connection error"</span>); |
| |
| <span class="comment">// We may have already sent a GOAWAY for this error, |
| // if so, don't send another, just flush and close up. |
| </span><span class="kw">if </span><span class="self">self |
| </span>.go_away |
| .going_away() |
| .map_or(<span class="bool-val">false</span>, |frame| frame.reason() == reason) |
| { |
| <span class="macro">tracing::trace!</span>(<span class="string">" -> already going away"</span>); |
| <span class="kw-2">*</span><span class="self">self</span>.state = State::Closing(reason, initiator); |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| |
| <span class="comment">// Reset all active streams |
| </span><span class="self">self</span>.streams.handle_error(e); |
| <span class="self">self</span>.go_away_now_data(reason, debug_data); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="comment">// Attempting to read a frame resulted in a stream level error. |
| // This is handled by resetting the frame then trying to read |
| // another frame. |
| </span><span class="prelude-val">Err</span>(Error::Reset(id, reason, initiator)) => { |
| <span class="macro">debug_assert_eq!</span>(initiator, Initiator::Library); |
| <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>id, <span class="question-mark">?</span>reason, <span class="string">"stream error"</span>); |
| <span class="self">self</span>.streams.send_reset(id, reason); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="comment">// Attempting to read a frame resulted in an I/O error. All |
| // active streams must be reset. |
| // |
| // TODO: Are I/O errors recoverable? |
| </span><span class="prelude-val">Err</span>(Error::Io(e, inner)) => { |
| <span class="macro">tracing::debug!</span>(error = <span class="question-mark">?</span>e, <span class="string">"Connection::poll; IO error"</span>); |
| <span class="kw">let </span>e = Error::Io(e, inner); |
| |
| <span class="comment">// Reset all active streams |
| </span><span class="self">self</span>.streams.handle_error(e.clone()); |
| |
| <span class="comment">// Return the error |
| </span><span class="prelude-val">Err</span>(e) |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>recv_frame(<span class="kw-2">&mut </span><span class="self">self</span>, frame: <span class="prelude-ty">Option</span><Frame>) -> <span class="prelude-ty">Result</span><ReceivedFrame, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::frame::Frame::<span class="kw-2">*</span>; |
| <span class="kw">match </span>frame { |
| <span class="prelude-val">Some</span>(Headers(frame)) => { |
| <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>frame, <span class="string">"recv HEADERS"</span>); |
| <span class="self">self</span>.streams.recv_headers(frame)<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Some</span>(Data(frame)) => { |
| <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>frame, <span class="string">"recv DATA"</span>); |
| <span class="self">self</span>.streams.recv_data(frame)<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Some</span>(Reset(frame)) => { |
| <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>frame, <span class="string">"recv RST_STREAM"</span>); |
| <span class="self">self</span>.streams.recv_reset(frame)<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Some</span>(PushPromise(frame)) => { |
| <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>frame, <span class="string">"recv PUSH_PROMISE"</span>); |
| <span class="self">self</span>.streams.recv_push_promise(frame)<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Some</span>(Settings(frame)) => { |
| <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>frame, <span class="string">"recv SETTINGS"</span>); |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(ReceivedFrame::Settings(frame)); |
| } |
| <span class="prelude-val">Some</span>(GoAway(frame)) => { |
| <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>frame, <span class="string">"recv GOAWAY"</span>); |
| <span class="comment">// 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. |
| </span><span class="self">self</span>.streams.recv_go_away(<span class="kw-2">&</span>frame)<span class="question-mark">?</span>; |
| <span class="kw-2">*</span><span class="self">self</span>.error = <span class="prelude-val">Some</span>(frame); |
| } |
| <span class="prelude-val">Some</span>(Ping(frame)) => { |
| <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>frame, <span class="string">"recv PING"</span>); |
| <span class="kw">let </span>status = <span class="self">self</span>.ping_pong.recv_ping(frame); |
| <span class="kw">if </span>status.is_shutdown() { |
| <span class="macro">assert!</span>( |
| <span class="self">self</span>.go_away.is_going_away(), |
| <span class="string">"received unexpected shutdown ping" |
| </span>); |
| |
| <span class="kw">let </span>last_processed_id = <span class="self">self</span>.streams.last_processed_id(); |
| <span class="self">self</span>.go_away(last_processed_id, Reason::NO_ERROR); |
| } |
| } |
| <span class="prelude-val">Some</span>(WindowUpdate(frame)) => { |
| <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>frame, <span class="string">"recv WINDOW_UPDATE"</span>); |
| <span class="self">self</span>.streams.recv_window_update(frame)<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Some</span>(Priority(frame)) => { |
| <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>frame, <span class="string">"recv PRIORITY"</span>); |
| <span class="comment">// TODO: handle |
| </span>} |
| <span class="prelude-val">None </span>=> { |
| <span class="macro">tracing::trace!</span>(<span class="string">"codec closed"</span>); |
| <span class="self">self</span>.streams.recv_eof(<span class="bool-val">false</span>).expect(<span class="string">"mutex poisoned"</span>); |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(ReceivedFrame::Done); |
| } |
| } |
| <span class="prelude-val">Ok</span>(ReceivedFrame::Continue) |
| } |
| } |
| |
| <span class="kw">enum </span>ReceivedFrame { |
| Settings(frame::Settings), |
| Continue, |
| Done, |
| } |
| |
| <span class="kw">impl</span><T, B> Connection<T, client::Peer, B> |
| <span class="kw">where |
| </span>T: AsyncRead + AsyncWrite, |
| B: Buf, |
| { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>streams(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Streams<B, client::Peer> { |
| <span class="kw-2">&</span><span class="self">self</span>.inner.streams |
| } |
| } |
| |
| <span class="kw">impl</span><T, B> Connection<T, server::Peer, B> |
| <span class="kw">where |
| </span>T: AsyncRead + AsyncWrite + Unpin, |
| B: Buf, |
| { |
| <span class="kw">pub fn </span>next_incoming(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><StreamRef<B>> { |
| <span class="self">self</span>.inner.streams.next_incoming() |
| } |
| |
| <span class="comment">// Graceful shutdown only makes sense for server peers. |
| </span><span class="kw">pub fn </span>go_away_gracefully(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">if </span><span class="self">self</span>.inner.go_away.is_going_away() { |
| <span class="comment">// No reason to start a new one. |
| </span><span class="kw">return</span>; |
| } |
| |
| <span class="comment">// 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. |
| </span><span class="self">self</span>.inner.as_dyn().go_away(StreamId::MAX, Reason::NO_ERROR); |
| |
| <span class="comment">// We take the advice of waiting 1 RTT literally, and wait |
| // for a pong before proceeding. |
| </span><span class="self">self</span>.inner.ping_pong.ping_shutdown(); |
| } |
| } |
| |
| <span class="kw">impl</span><T, P, B> Drop <span class="kw">for </span>Connection<T, P, B> |
| <span class="kw">where |
| </span>P: Peer, |
| B: Buf, |
| { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// Ignore errors as this indicates that the mutex is poisoned. |
| </span><span class="kw">let _ </span>= <span class="self">self</span>.inner.streams.recv_eof(<span class="bool-val">true</span>); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="h2" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
