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 <!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/streams/recv.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>recv.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 super</span>::<span class="kw-2">*</span>;
 <span class="kw">use </span><span class="kw">crate</span>::codec::UserError;
 <span class="kw">use </span><span class="kw">crate</span>::frame::{<span class="self">self</span>, PushPromiseHeaderError, Reason, DEFAULT_INITIAL_WINDOW_SIZE};
 <span class="kw">use </span><span class="kw">crate</span>::proto::{<span class="self">self</span>, Error};

 <span class="kw">use </span>http::{HeaderMap, Request, Response};

 <span class="kw">use </span>std::cmp::Ordering;
 <span class="kw">use </span>std::io;
 <span class="kw">use </span>std::task::{Context, Poll, Waker};
 <span class="kw">use </span>std::time::{Duration, Instant};

 <span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Recv {
     <span class="doccomment">/// Initial window size of remote initiated streams
     </span>init_window_sz: WindowSize,

     <span class="doccomment">/// Connection level flow control governing received data
     </span>flow: FlowControl,

     <span class="doccomment">/// Amount of connection window capacity currently used by outstanding streams.
     </span>in_flight_data: WindowSize,

     <span class="doccomment">/// The lowest stream ID that is still idle
     </span>next_stream_id: <span class="prelude-ty">Result</span>&lt;StreamId, StreamIdOverflow&gt;,

     <span class="doccomment">/// The stream ID of the last processed stream
     </span>last_processed_id: StreamId,

     <span class="doccomment">/// Any streams with a higher ID are ignored.
     ///
     /// This starts as MAX, but is lowered when a GOAWAY is received.
     ///
     /// &gt; After sending a GOAWAY frame, the sender can discard frames for
     /// &gt; streams initiated by the receiver with identifiers higher than
     /// &gt; the identified last stream.
     </span>max_stream_id: StreamId,

     <span class="doccomment">/// Streams that have pending window updates
     </span>pending_window_updates: store::Queue&lt;stream::NextWindowUpdate&gt;,

     <span class="doccomment">/// New streams to be accepted
     </span>pending_accept: store::Queue&lt;stream::NextAccept&gt;,

     <span class="doccomment">/// Locally reset streams that should be reaped when they expire
     </span>pending_reset_expired: store::Queue&lt;stream::NextResetExpire&gt;,

     <span class="doccomment">/// How long locally reset streams should ignore received frames
     </span>reset_duration: Duration,

     <span class="doccomment">/// Holds frames that are waiting to be read
     </span>buffer: Buffer&lt;Event&gt;,

     <span class="doccomment">/// Refused StreamId, this represents a frame that must be sent out.
     </span>refused: <span class="prelude-ty">Option</span>&lt;StreamId&gt;,

     <span class="doccomment">/// If push promises are allowed to be received.
     </span>is_push_enabled: bool,

     <span class="doccomment">/// If extended connect protocol is enabled.
     </span>is_extended_connect_protocol_enabled: bool,
 }

 <span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>Event {
     Headers(peer::PollMessage),
     Data(Bytes),
     Trailers(HeaderMap),
 }

 <span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>RecvHeaderBlockError&lt;T&gt; {
     Oversize(T),
     State(Error),
 }

 <span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Open {
     PushPromise,
     Headers,
 }

 <span class="kw">impl </span>Recv {
     <span class="kw">pub fn </span>new(peer: peer::Dyn, config: <span class="kw-2">&amp;</span>Config) -&gt; <span class="self">Self </span>{
         <span class="kw">let </span>next_stream_id = <span class="kw">if </span>peer.is_server() { <span class="number">1 </span>} <span class="kw">else </span>{ <span class="number">2 </span>};

         <span class="kw">let </span><span class="kw-2">mut </span>flow = FlowControl::new();

         <span class="comment">// connections always have the default window size, regardless of
         // settings
         </span>flow.inc_window(DEFAULT_INITIAL_WINDOW_SIZE)
             .expect(<span class="string">&quot;invalid initial remote window size&quot;</span>);
         flow.assign_capacity(DEFAULT_INITIAL_WINDOW_SIZE);

         Recv {
             init_window_sz: config.local_init_window_sz,
             flow,
             in_flight_data: <span class="number">0 </span><span class="kw">as </span>WindowSize,
             next_stream_id: <span class="prelude-val">Ok</span>(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: <span class="prelude-val">None</span>,
             is_push_enabled: config.local_push_enabled,
             is_extended_connect_protocol_enabled: config.extended_connect_protocol_enabled,
         }
     }

     <span class="doccomment">/// Returns the initial receive window size
     </span><span class="kw">pub fn </span>init_window_sz(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; WindowSize {
         <span class="self">self</span>.init_window_sz
     }

     <span class="doccomment">/// Returns the ID of the last processed stream
     </span><span class="kw">pub fn </span>last_processed_id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; StreamId {
         <span class="self">self</span>.last_processed_id
     }

     <span class="doccomment">/// Update state reflecting a new, remotely opened stream
     ///
     /// Returns the stream state if successful. `None` if refused
     </span><span class="kw">pub fn </span>open(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         id: StreamId,
         mode: Open,
         counts: <span class="kw-2">&amp;mut </span>Counts,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;StreamId&gt;, Error&gt; {
         <span class="macro">assert!</span>(<span class="self">self</span>.refused.is_none());

         counts.peer().ensure_can_open(id, mode)<span class="question-mark">?</span>;

         <span class="kw">let </span>next_id = <span class="self">self</span>.next_stream_id()<span class="question-mark">?</span>;
         <span class="kw">if </span>id &lt; next_id {
             <span class="macro">proto_err!</span>(conn: <span class="string">&quot;id ({:?}) &lt; next_id ({:?})&quot;</span>, id, next_id);
             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_go_away(Reason::PROTOCOL_ERROR));
         }

         <span class="self">self</span>.next_stream_id = id.next_id();

         <span class="kw">if </span>!counts.can_inc_num_recv_streams() {
             <span class="self">self</span>.refused = <span class="prelude-val">Some</span>(id);
             <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>);
         }

         <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(id))
     }

     <span class="doccomment">/// Transition the stream state based on receiving headers
     ///
     /// The caller ensures that the frame represents headers and not trailers.
     </span><span class="kw">pub fn </span>recv_headers(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         frame: frame::Headers,
         stream: <span class="kw-2">&amp;mut </span>store::Ptr,
         counts: <span class="kw-2">&amp;mut </span>Counts,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), RecvHeaderBlockError&lt;<span class="prelude-ty">Option</span>&lt;frame::Headers&gt;&gt;&gt; {
         <span class="macro">tracing::trace!</span>(<span class="string">&quot;opening stream; init_window={}&quot;</span>, <span class="self">self</span>.init_window_sz);
         <span class="kw">let </span>is_initial = stream.state.recv_open(<span class="kw-2">&amp;</span>frame)<span class="question-mark">?</span>;

         <span class="kw">if </span>is_initial {
             <span class="comment">// TODO: be smarter about this logic
             </span><span class="kw">if </span>frame.stream_id() &gt; <span class="self">self</span>.last_processed_id {
                 <span class="self">self</span>.last_processed_id = frame.stream_id();
             }

             <span class="comment">// Increment the number of concurrent streams
             </span>counts.inc_num_recv_streams(stream);
         }

         <span class="kw">if </span>!stream.content_length.is_head() {
             <span class="kw">use </span><span class="kw">super</span>::stream::ContentLength;
             <span class="kw">use </span>http::header;

             <span class="kw">if let </span><span class="prelude-val">Some</span>(content_length) = frame.fields().get(header::CONTENT_LENGTH) {
                 <span class="kw">let </span>content_length = <span class="kw">match </span>frame::parse_u64(content_length.as_bytes()) {
                     <span class="prelude-val">Ok</span>(v) =&gt; v,
                     <span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; {
                         <span class="macro">proto_err!</span>(stream: <span class="string">&quot;could not parse content-length; stream={:?}&quot;</span>, stream.id);
                         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_reset(stream.id, Reason::PROTOCOL_ERROR).into());
                     }
                 };

                 stream.content_length = ContentLength::Remaining(content_length);
             }
         }

         <span class="kw">if </span>frame.is_over_size() {
             <span class="comment">// A frame is over size if the decoded header block was bigger than
             // SETTINGS_MAX_HEADER_LIST_SIZE.
             //
             // &gt; A server that receives a larger header block than it is willing
             // &gt; to handle can send an HTTP 431 (Request Header Fields Too
             // &gt; Large) status code [RFC6585]. A client can discard responses
             // &gt; that it cannot process.
             //
             // So, if peer is a server, we&#39;ll send a 431. In either case,
             // an error is recorded, which will send a REFUSED_STREAM,
             // since we don&#39;t want any of the data frames either.
             </span><span class="macro">tracing::debug!</span>(
                 <span class="string">&quot;stream error REQUEST_HEADER_FIELDS_TOO_LARGE -- \
                  recv_headers: frame is over size; stream={:?}&quot;</span>,
                 stream.id
             );
             <span class="kw">return if </span>counts.peer().is_server() &amp;&amp; is_initial {
                 <span class="kw">let </span><span class="kw-2">mut </span>res = frame::Headers::new(
                     stream.id,
                     frame::Pseudo::response(::http::StatusCode::REQUEST_HEADER_FIELDS_TOO_LARGE),
                     HeaderMap::new(),
                 );
                 res.set_end_stream();
                 <span class="prelude-val">Err</span>(RecvHeaderBlockError::Oversize(<span class="prelude-val">Some</span>(res)))
             } <span class="kw">else </span>{
                 <span class="prelude-val">Err</span>(RecvHeaderBlockError::Oversize(<span class="prelude-val">None</span>))
             };
         }

         <span class="kw">let </span>stream_id = frame.stream_id();
         <span class="kw">let </span>(pseudo, fields) = frame.into_parts();

         <span class="kw">if </span>pseudo.protocol.is_some()
             &amp;&amp; counts.peer().is_server()
             &amp;&amp; !<span class="self">self</span>.is_extended_connect_protocol_enabled
         {
             <span class="macro">proto_err!</span>(stream: <span class="string">&quot;cannot use :protocol if extended connect protocol is disabled; stream={:?}&quot;</span>, stream.id);
             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_reset(stream.id, Reason::PROTOCOL_ERROR).into());
         }

         <span class="kw">if </span>!pseudo.is_informational() {
             <span class="kw">let </span>message = counts
                 .peer()
                 .convert_poll_message(pseudo, fields, stream_id)<span class="question-mark">?</span>;

             <span class="comment">// Push the frame onto the stream&#39;s recv buffer
             </span>stream
                 .pending_recv
                 .push_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer, Event::Headers(message));
             stream.notify_recv();
         }

         <span class="comment">// Only servers can receive a headers frame that initiates the stream.
         // This is verified in `Streams` before calling this function.
         </span><span class="kw">if </span>counts.peer().is_server() {
             <span class="self">self</span>.pending_accept.push(stream);
         }

         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Called by the server to get the request
     ///
     /// TODO: Should this fn return `Result`?
     </span><span class="kw">pub fn </span>take_request(<span class="kw-2">&amp;mut </span><span class="self">self</span>, stream: <span class="kw-2">&amp;mut </span>store::Ptr) -&gt; Request&lt;()&gt; {
         <span class="kw">use </span><span class="kw">super</span>::peer::PollMessage::<span class="kw-2">*</span>;

         <span class="kw">match </span>stream.pending_recv.pop_front(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer) {
             <span class="prelude-val">Some</span>(Event::Headers(Server(request))) =&gt; request,
             <span class="kw">_ </span>=&gt; <span class="macro">panic!</span>(),
         }
     }

     <span class="doccomment">/// Called by the client to get pushed response
     </span><span class="kw">pub fn </span>poll_pushed(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;</span>Context,
         stream: <span class="kw-2">&amp;mut </span>store::Ptr,
     ) -&gt; Poll&lt;<span class="prelude-ty">Option</span>&lt;<span class="prelude-ty">Result</span>&lt;(Request&lt;()&gt;, store::Key), proto::Error&gt;&gt;&gt; {
         <span class="kw">use </span><span class="kw">super</span>::peer::PollMessage::<span class="kw-2">*</span>;

         <span class="kw">let </span><span class="kw-2">mut </span>ppp = stream.pending_push_promises.take();
         <span class="kw">let </span>pushed = ppp.pop(stream.store_mut()).map(|<span class="kw-2">mut </span>pushed| {
             <span class="kw">match </span>pushed.pending_recv.pop_front(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer) {
                 <span class="prelude-val">Some</span>(Event::Headers(Server(headers))) =&gt; (headers, pushed.key()),
                 <span class="comment">// When frames are pushed into the queue, it is verified that
                 // the first frame is a HEADERS frame.
                 </span><span class="kw">_ </span>=&gt; <span class="macro">panic!</span>(<span class="string">&quot;Headers not set on pushed stream&quot;</span>),
             }
         });
         stream.pending_push_promises = ppp;
         <span class="kw">if let </span><span class="prelude-val">Some</span>(p) = pushed {
             Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(p)))
         } <span class="kw">else </span>{
             <span class="kw">let </span>is_open = stream.state.ensure_recv_open()<span class="question-mark">?</span>;

             <span class="kw">if </span>is_open {
                 stream.recv_task = <span class="prelude-val">Some</span>(cx.waker().clone());
                 Poll::Pending
             } <span class="kw">else </span>{
                 Poll::Ready(<span class="prelude-val">None</span>)
             }
         }
     }

     <span class="doccomment">/// Called by the client to get the response
     </span><span class="kw">pub fn </span>poll_response(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;</span>Context,
         stream: <span class="kw-2">&amp;mut </span>store::Ptr,
     ) -&gt; Poll&lt;<span class="prelude-ty">Result</span>&lt;Response&lt;()&gt;, proto::Error&gt;&gt; {
         <span class="kw">use </span><span class="kw">super</span>::peer::PollMessage::<span class="kw-2">*</span>;

         <span class="comment">// If the buffer is not empty, then the first frame must be a HEADERS
         // frame or the user violated the contract.
         </span><span class="kw">match </span>stream.pending_recv.pop_front(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer) {
             <span class="prelude-val">Some</span>(Event::Headers(Client(response))) =&gt; Poll::Ready(<span class="prelude-val">Ok</span>(response)),
             <span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="macro">panic!</span>(<span class="string">&quot;poll_response called after response returned&quot;</span>),
             <span class="prelude-val">None </span>=&gt; {
                 stream.state.ensure_recv_open()<span class="question-mark">?</span>;

                 stream.recv_task = <span class="prelude-val">Some</span>(cx.waker().clone());
                 Poll::Pending
             }
         }
     }

     <span class="doccomment">/// Transition the stream based on receiving trailers
     </span><span class="kw">pub fn </span>recv_trailers(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         frame: frame::Headers,
         stream: <span class="kw-2">&amp;mut </span>store::Ptr,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
         <span class="comment">// Transition the state
         </span>stream.state.recv_close()<span class="question-mark">?</span>;

         <span class="kw">if </span>stream.ensure_content_length_zero().is_err() {
             <span class="macro">proto_err!</span>(stream: <span class="string">&quot;recv_trailers: content-length is not zero; stream={:?};&quot;</span>,  stream.id);
             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_reset(stream.id, Reason::PROTOCOL_ERROR));
         }

         <span class="kw">let </span>trailers = frame.into_fields();

         <span class="comment">// Push the frame onto the stream&#39;s recv buffer
         </span>stream
             .pending_recv
             .push_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer, Event::Trailers(trailers));
         stream.notify_recv();

         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Releases capacity of the connection
     </span><span class="kw">pub fn </span>release_connection_capacity(<span class="kw-2">&amp;mut </span><span class="self">self</span>, capacity: WindowSize, task: <span class="kw-2">&amp;mut </span><span class="prelude-ty">Option</span>&lt;Waker&gt;) {
         <span class="macro">tracing::trace!</span>(
             <span class="string">&quot;release_connection_capacity; size={}, connection in_flight_data={}&quot;</span>,
             capacity,
             <span class="self">self</span>.in_flight_data,
         );

         <span class="comment">// Decrement in-flight data
         </span><span class="self">self</span>.in_flight_data -= capacity;

         <span class="comment">// Assign capacity to connection
         </span><span class="self">self</span>.flow.assign_capacity(capacity);

         <span class="kw">if </span><span class="self">self</span>.flow.unclaimed_capacity().is_some() {
             <span class="kw">if let </span><span class="prelude-val">Some</span>(task) = task.take() {
                 task.wake();
             }
         }
     }

     <span class="doccomment">/// Releases capacity back to the connection &amp; stream
     </span><span class="kw">pub fn </span>release_capacity(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         capacity: WindowSize,
         stream: <span class="kw-2">&amp;mut </span>store::Ptr,
         task: <span class="kw-2">&amp;mut </span><span class="prelude-ty">Option</span>&lt;Waker&gt;,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), UserError&gt; {
         <span class="macro">tracing::trace!</span>(<span class="string">&quot;release_capacity; size={}&quot;</span>, capacity);

         <span class="kw">if </span>capacity &gt; stream.in_flight_recv_data {
             <span class="kw">return </span><span class="prelude-val">Err</span>(UserError::ReleaseCapacityTooBig);
         }

         <span class="self">self</span>.release_connection_capacity(capacity, task);

         <span class="comment">// Decrement in-flight data
         </span>stream.in_flight_recv_data -= capacity;

         <span class="comment">// Assign capacity to stream
         </span>stream.recv_flow.assign_capacity(capacity);

         <span class="kw">if </span>stream.recv_flow.unclaimed_capacity().is_some() {
             <span class="comment">// Queue the stream for sending the WINDOW_UPDATE frame.
             </span><span class="self">self</span>.pending_window_updates.push(stream);

             <span class="kw">if let </span><span class="prelude-val">Some</span>(task) = task.take() {
                 task.wake();
             }
         }

         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Release any unclaimed capacity for a closed stream.
     </span><span class="kw">pub fn </span>release_closed_capacity(<span class="kw-2">&amp;mut </span><span class="self">self</span>, stream: <span class="kw-2">&amp;mut </span>store::Ptr, task: <span class="kw-2">&amp;mut </span><span class="prelude-ty">Option</span>&lt;Waker&gt;) {
         <span class="macro">debug_assert_eq!</span>(stream.ref_count, <span class="number">0</span>);

         <span class="kw">if </span>stream.in_flight_recv_data == <span class="number">0 </span>{
             <span class="kw">return</span>;
         }

         <span class="macro">tracing::trace!</span>(
             <span class="string">&quot;auto-release closed stream ({:?}) capacity: {:?}&quot;</span>,
             stream.id,
             stream.in_flight_recv_data,
         );

         <span class="self">self</span>.release_connection_capacity(stream.in_flight_recv_data, task);
         stream.in_flight_recv_data = <span class="number">0</span>;

         <span class="self">self</span>.clear_recv_buffer(stream);
     }

     <span class="doccomment">/// Set the &quot;target&quot; 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 &quot;target&quot;.
     ///
     /// 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.
     </span><span class="kw">pub fn </span>set_target_connection_window(<span class="kw-2">&amp;mut </span><span class="self">self</span>, target: WindowSize, task: <span class="kw-2">&amp;mut </span><span class="prelude-ty">Option</span>&lt;Waker&gt;) {
         <span class="macro">tracing::trace!</span>(
             <span class="string">&quot;set_target_connection_window; target={}; available={}, reserved={}&quot;</span>,
             target,
             <span class="self">self</span>.flow.available(),
             <span class="self">self</span>.in_flight_data,
         );

         <span class="comment">// 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.
         </span><span class="kw">let </span>current = (<span class="self">self</span>.flow.available() + <span class="self">self</span>.in_flight_data).checked_size();
         <span class="kw">if </span>target &gt; current {
             <span class="self">self</span>.flow.assign_capacity(target - current);
         } <span class="kw">else </span>{
             <span class="self">self</span>.flow.claim_capacity(current - target);
         }

         <span class="comment">// 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.
         </span><span class="kw">if </span><span class="self">self</span>.flow.unclaimed_capacity().is_some() {
             <span class="kw">if let </span><span class="prelude-val">Some</span>(task) = task.take() {
                 task.wake();
             }
         }
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>apply_local_settings(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         settings: <span class="kw-2">&amp;</span>frame::Settings,
         store: <span class="kw-2">&amp;mut </span>Store,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), proto::Error&gt; {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(val) = settings.is_extended_connect_protocol_enabled() {
             <span class="self">self</span>.is_extended_connect_protocol_enabled = val;
         }

         <span class="kw">if let </span><span class="prelude-val">Some</span>(target) = settings.initial_window_size() {
             <span class="kw">let </span>old_sz = <span class="self">self</span>.init_window_sz;
             <span class="self">self</span>.init_window_sz = target;

             <span class="macro">tracing::trace!</span>(<span class="string">&quot;update_initial_window_size; new={}; old={}&quot;</span>, target, old_sz,);

             <span class="comment">// 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 &quot;open&quot; or &quot;half-closed (remote)&quot; 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.

             </span><span class="kw">match </span>target.cmp(<span class="kw-2">&amp;</span>old_sz) {
                 Ordering::Less =&gt; {
                     <span class="comment">// We must decrease the (local) window on every open stream.
                     </span><span class="kw">let </span>dec = old_sz - target;
                     <span class="macro">tracing::trace!</span>(<span class="string">&quot;decrementing all windows; dec={}&quot;</span>, dec);

                     store.for_each(|<span class="kw-2">mut </span>stream| {
                         stream.recv_flow.dec_recv_window(dec);
                     })
                 }
                 Ordering::Greater =&gt; {
                     <span class="comment">// We must increase the (local) window on every open stream.
                     </span><span class="kw">let </span>inc = target - old_sz;
                     <span class="macro">tracing::trace!</span>(<span class="string">&quot;incrementing all windows; inc={}&quot;</span>, inc);
                     store.try_for_each(|<span class="kw-2">mut </span>stream| {
                         <span class="comment">// XXX: Shouldn&#39;t the peer have already noticed our
                         // overflow and sent us a GOAWAY?
                         </span>stream
                             .recv_flow
                             .inc_window(inc)
                             .map_err(proto::Error::library_go_away)<span class="question-mark">?</span>;
                         stream.recv_flow.assign_capacity(inc);
                         <span class="prelude-val">Ok</span>::&lt;<span class="kw">_</span>, proto::Error&gt;(())
                     })<span class="question-mark">?</span>;
                 }
                 Ordering::Equal =&gt; (),
             }
         }

         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">pub fn </span>is_end_stream(<span class="kw-2">&amp;</span><span class="self">self</span>, stream: <span class="kw-2">&amp;</span>store::Ptr) -&gt; bool {
         <span class="kw">if </span>!stream.state.is_recv_closed() {
             <span class="kw">return </span><span class="bool-val">false</span>;
         }

         stream.pending_recv.is_empty()
     }

     <span class="kw">pub fn </span>recv_data(<span class="kw-2">&amp;mut </span><span class="self">self</span>, frame: frame::Data, stream: <span class="kw-2">&amp;mut </span>store::Ptr) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
         <span class="kw">let </span>sz = frame.payload().len();

         <span class="comment">// This should have been enforced at the codec::FramedRead layer, so
         // this is just a sanity check.
         </span><span class="macro">assert!</span>(sz &lt;= MAX_WINDOW_SIZE <span class="kw">as </span>usize);

         <span class="kw">let </span>sz = sz <span class="kw">as </span>WindowSize;

         <span class="kw">let </span>is_ignoring_frame = stream.state.is_local_error();

         <span class="kw">if </span>!is_ignoring_frame &amp;&amp; !stream.state.is_recv_streaming() {
             <span class="comment">// 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.
             </span><span class="macro">proto_err!</span>(conn: <span class="string">&quot;unexpected DATA frame; stream={:?}&quot;</span>, stream.id);
             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_go_away(Reason::PROTOCOL_ERROR));
         }

         <span class="macro">tracing::trace!</span>(
             <span class="string">&quot;recv_data; size={}; connection={}; stream={}&quot;</span>,
             sz,
             <span class="self">self</span>.flow.window_size(),
             stream.recv_flow.window_size()
         );

         <span class="kw">if </span>is_ignoring_frame {
             <span class="macro">tracing::trace!</span>(
                 <span class="string">&quot;recv_data; frame ignored on locally reset {:?} for some time&quot;</span>,
                 stream.id,
             );
             <span class="kw">return </span><span class="self">self</span>.ignore_data(sz);
         }

         <span class="comment">// Ensure that there is enough capacity on the connection before acting
         // on the stream.
         </span><span class="self">self</span>.consume_connection_window(sz)<span class="question-mark">?</span>;

         <span class="kw">if </span>stream.recv_flow.window_size() &lt; sz {
             <span class="comment">// http://httpwg.org/specs/rfc7540.html#WINDOW_UPDATE
             // &gt; A receiver MAY respond with a stream error (Section 5.4.2) or
             // &gt; connection error (Section 5.4.1) of type FLOW_CONTROL_ERROR if
             // &gt; it is unable to accept a frame.
             //
             // So, for violating the **stream** window, we can send either a
             // stream or connection error. We&#39;ve opted to send a stream
             // error.
             </span><span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_reset(stream.id, Reason::FLOW_CONTROL_ERROR));
         }

         <span class="kw">if </span>stream.dec_content_length(frame.payload().len()).is_err() {
             <span class="macro">proto_err!</span>(stream:
                 <span class="string">&quot;recv_data: content-length overflow; stream={:?}; len={:?}&quot;</span>,
                 stream.id,
                 frame.payload().len(),
             );
             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_reset(stream.id, Reason::PROTOCOL_ERROR));
         }

         <span class="kw">if </span>frame.is_end_stream() {
             <span class="kw">if </span>stream.ensure_content_length_zero().is_err() {
                 <span class="macro">proto_err!</span>(stream:
                     <span class="string">&quot;recv_data: content-length underflow; stream={:?}; len={:?}&quot;</span>,
                     stream.id,
                     frame.payload().len(),
                 );
                 <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_reset(stream.id, Reason::PROTOCOL_ERROR));
             }

             <span class="kw">if </span>stream.state.recv_close().is_err() {
                 <span class="macro">proto_err!</span>(conn: <span class="string">&quot;recv_data: failed to transition to closed state; stream={:?}&quot;</span>, stream.id);
                 <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_go_away(Reason::PROTOCOL_ERROR));
             }
         }

         <span class="comment">// Received a frame, but no one cared about it. fix issue#648
         </span><span class="kw">if </span>!stream.is_recv {
             <span class="macro">tracing::trace!</span>(
                 <span class="string">&quot;recv_data; frame ignored on stream release {:?} for some time&quot;</span>,
                 stream.id,
             );
             <span class="self">self</span>.release_connection_capacity(sz, <span class="kw-2">&amp;mut </span><span class="prelude-val">None</span>);
             <span class="kw">return </span><span class="prelude-val">Ok</span>(());
         }

         <span class="comment">// Update stream level flow control
         </span>stream.recv_flow.send_data(sz);

         <span class="comment">// Track the data as in-flight
         </span>stream.in_flight_recv_data += sz;

         <span class="kw">let </span>event = Event::Data(frame.into_payload());

         <span class="comment">// Push the frame onto the recv buffer
         </span>stream.pending_recv.push_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer, event);
         stream.notify_recv();

         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">pub fn </span>ignore_data(<span class="kw-2">&amp;mut </span><span class="self">self</span>, sz: WindowSize) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
         <span class="comment">// Ensure that there is enough capacity on the connection...
         </span><span class="self">self</span>.consume_connection_window(sz)<span class="question-mark">?</span>;

         <span class="comment">// Since we are ignoring this frame,
         // we aren&#39;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&#39;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.
         </span><span class="self">self</span>.release_connection_capacity(sz, <span class="kw-2">&amp;mut </span><span class="prelude-val">None</span>);
         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">pub fn </span>consume_connection_window(<span class="kw-2">&amp;mut </span><span class="self">self</span>, sz: WindowSize) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
         <span class="kw">if </span><span class="self">self</span>.flow.window_size() &lt; sz {
             <span class="macro">tracing::debug!</span>(
                 <span class="string">&quot;connection error FLOW_CONTROL_ERROR -- window_size ({:?}) &lt; sz ({:?});&quot;</span>,
                 <span class="self">self</span>.flow.window_size(),
                 sz,
             );
             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_go_away(Reason::FLOW_CONTROL_ERROR));
         }

         <span class="comment">// Update connection level flow control
         </span><span class="self">self</span>.flow.send_data(sz);

         <span class="comment">// Track the data as in-flight
         </span><span class="self">self</span>.in_flight_data += sz;
         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">pub fn </span>recv_push_promise(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         frame: frame::PushPromise,
         stream: <span class="kw-2">&amp;mut </span>store::Ptr,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
         stream.state.reserve_remote()<span class="question-mark">?</span>;
         <span class="kw">if </span>frame.is_over_size() {
             <span class="comment">// A frame is over size if the decoded header block was bigger than
             // SETTINGS_MAX_HEADER_LIST_SIZE.
             //
             // &gt; A server that receives a larger header block than it is willing
             // &gt; to handle can send an HTTP 431 (Request Header Fields Too
             // &gt; Large) status code [RFC6585]. A client can discard responses
             // &gt; that it cannot process.
             //
             // So, if peer is a server, we&#39;ll send a 431. In either case,
             // an error is recorded, which will send a REFUSED_STREAM,
             // since we don&#39;t want any of the data frames either.
             </span><span class="macro">tracing::debug!</span>(
                 <span class="string">&quot;stream error REFUSED_STREAM -- recv_push_promise: \
                  headers frame is over size; promised_id={:?};&quot;</span>,
                 frame.promised_id(),
             );
             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_reset(
                 frame.promised_id(),
                 Reason::REFUSED_STREAM,
             ));
         }

         <span class="kw">let </span>promised_id = frame.promised_id();
         <span class="kw">let </span>(pseudo, fields) = frame.into_parts();
         <span class="kw">let </span>req = <span class="kw">crate</span>::server::Peer::convert_poll_message(pseudo, fields, promised_id)<span class="question-mark">?</span>;

         <span class="kw">if let </span><span class="prelude-val">Err</span>(e) = frame::PushPromise::validate_request(<span class="kw-2">&amp;</span>req) {
             <span class="kw">use </span>PushPromiseHeaderError::<span class="kw-2">*</span>;
             <span class="kw">match </span>e {
                 NotSafeAndCacheable =&gt; <span class="macro">proto_err!</span>(
                     stream:
                     <span class="string">&quot;recv_push_promise: method {} is not safe and cacheable; promised_id={:?}&quot;</span>,
                     req.method(),
                     promised_id,
                 ),
                 InvalidContentLength(e) =&gt; <span class="macro">proto_err!</span>(
                     stream:
                     <span class="string">&quot;recv_push_promise; promised request has invalid content-length {:?}; promised_id={:?}&quot;</span>,
                     e,
                     promised_id,
                 ),
             }
             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_reset(promised_id, Reason::PROTOCOL_ERROR));
         }

         <span class="kw">use </span><span class="kw">super</span>::peer::PollMessage::<span class="kw-2">*</span>;
         stream
             .pending_recv
             .push_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer, Event::Headers(Server(req)));
         stream.notify_recv();
         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Ensures that `id` is not in the `Idle` state.
     </span><span class="kw">pub fn </span>ensure_not_idle(<span class="kw-2">&amp;</span><span class="self">self</span>, id: StreamId) -&gt; <span class="prelude-ty">Result</span>&lt;(), Reason&gt; {
         <span class="kw">if let </span><span class="prelude-val">Ok</span>(next) = <span class="self">self</span>.next_stream_id {
             <span class="kw">if </span>id &gt;= next {
                 <span class="macro">tracing::debug!</span>(
                     <span class="string">&quot;stream ID implicitly closed, PROTOCOL_ERROR; stream={:?}&quot;</span>,
                     id
                 );
                 <span class="kw">return </span><span class="prelude-val">Err</span>(Reason::PROTOCOL_ERROR);
             }
         }
         <span class="comment">// if next_stream_id is overflowed, that&#39;s ok.

         </span><span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Handle remote sending an explicit RST_STREAM.
     </span><span class="kw">pub fn </span>recv_reset(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         frame: frame::Reset,
         stream: <span class="kw-2">&amp;mut </span>Stream,
         counts: <span class="kw-2">&amp;mut </span>Counts,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
         <span class="comment">// Reseting a stream that the user hasn&#39;t accepted is possible,
         // but should be done with care. These streams will continue
         // to take up memory in the accept queue, but will no longer be
         // counted as &quot;concurrent&quot; streams.
         //
         // So, we have a separate limit for these.
         //
         // See https://github.com/hyperium/hyper/issues/2877
         </span><span class="kw">if </span>stream.is_pending_accept {
             <span class="kw">if </span>counts.can_inc_num_remote_reset_streams() {
                 counts.inc_num_remote_reset_streams();
             } <span class="kw">else </span>{
                 <span class="macro">tracing::warn!</span>(
                     <span class="string">&quot;recv_reset; remotely-reset pending-accept streams reached limit ({:?})&quot;</span>,
                     counts.max_remote_reset_streams(),
                 );
                 <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_go_away_data(
                     Reason::ENHANCE_YOUR_CALM,
                     <span class="string">&quot;too_many_resets&quot;</span>,
                 ));
             }
         }

         <span class="comment">// Notify the stream
         </span>stream.state.recv_reset(frame, stream.is_pending_send);

         stream.notify_send();
         stream.notify_recv();

         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Handle a connection-level error
     </span><span class="kw">pub fn </span>handle_error(<span class="kw-2">&amp;mut </span><span class="self">self</span>, err: <span class="kw-2">&amp;</span>proto::Error, stream: <span class="kw-2">&amp;mut </span>Stream) {
         <span class="comment">// Receive an error
         </span>stream.state.handle_error(err);

         <span class="comment">// If a receiver is waiting, notify it
         </span>stream.notify_send();
         stream.notify_recv();
     }

     <span class="kw">pub fn </span>go_away(<span class="kw-2">&amp;mut </span><span class="self">self</span>, last_processed_id: StreamId) {
         <span class="macro">assert!</span>(<span class="self">self</span>.max_stream_id &gt;= last_processed_id);
         <span class="self">self</span>.max_stream_id = last_processed_id;
     }

     <span class="kw">pub fn </span>recv_eof(<span class="kw-2">&amp;mut </span><span class="self">self</span>, stream: <span class="kw-2">&amp;mut </span>Stream) {
         stream.state.recv_eof();
         stream.notify_send();
         stream.notify_recv();
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>clear_recv_buffer(<span class="kw-2">&amp;mut </span><span class="self">self</span>, stream: <span class="kw-2">&amp;mut </span>Stream) {
         <span class="kw">while </span>stream.pending_recv.pop_front(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer).is_some() {
             <span class="comment">// drop it
         </span>}
     }

     <span class="doccomment">/// Get the max ID of streams we can receive.
     ///
     /// This gets lowered if we send a GOAWAY frame.
     </span><span class="kw">pub fn </span>max_stream_id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; StreamId {
         <span class="self">self</span>.max_stream_id
     }

     <span class="kw">pub fn </span>next_stream_id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;StreamId, Error&gt; {
         <span class="kw">if let </span><span class="prelude-val">Ok</span>(id) = <span class="self">self</span>.next_stream_id {
             <span class="prelude-val">Ok</span>(id)
         } <span class="kw">else </span>{
             <span class="prelude-val">Err</span>(Error::library_go_away(Reason::PROTOCOL_ERROR))
         }
     }

     <span class="kw">pub fn </span>may_have_created_stream(<span class="kw-2">&amp;</span><span class="self">self</span>, id: StreamId) -&gt; bool {
         <span class="kw">if let </span><span class="prelude-val">Ok</span>(next_id) = <span class="self">self</span>.next_stream_id {
             <span class="comment">// Peer::is_local_init should have been called beforehand
             </span><span class="macro">debug_assert_eq!</span>(id.is_server_initiated(), next_id.is_server_initiated(),);
             id &lt; next_id
         } <span class="kw">else </span>{
             <span class="bool-val">true
         </span>}
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>maybe_reset_next_stream_id(<span class="kw-2">&amp;mut </span><span class="self">self</span>, id: StreamId) {
         <span class="kw">if let </span><span class="prelude-val">Ok</span>(next_id) = <span class="self">self</span>.next_stream_id {
             <span class="comment">// !Peer::is_local_init should have been called beforehand
             </span><span class="macro">debug_assert_eq!</span>(id.is_server_initiated(), next_id.is_server_initiated());
             <span class="kw">if </span>id &gt;= next_id {
                 <span class="self">self</span>.next_stream_id = id.next_id();
             }
         }
     }

     <span class="doccomment">/// Returns true if the remote peer can reserve a stream with the given ID.
     </span><span class="kw">pub fn </span>ensure_can_reserve(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
         <span class="kw">if </span>!<span class="self">self</span>.is_push_enabled {
             <span class="macro">proto_err!</span>(conn: <span class="string">&quot;recv_push_promise: push is disabled&quot;</span>);
             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_go_away(Reason::PROTOCOL_ERROR));
         }

         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Add a locally reset stream to queue to be eventually reaped.
     </span><span class="kw">pub fn </span>enqueue_reset_expiration(<span class="kw-2">&amp;mut </span><span class="self">self</span>, stream: <span class="kw-2">&amp;mut </span>store::Ptr, counts: <span class="kw-2">&amp;mut </span>Counts) {
         <span class="kw">if </span>!stream.state.is_local_error() || stream.is_pending_reset_expiration() {
             <span class="kw">return</span>;
         }

         <span class="macro">tracing::trace!</span>(<span class="string">&quot;enqueue_reset_expiration; {:?}&quot;</span>, stream.id);

         <span class="kw">if </span>!counts.can_inc_num_reset_streams() {
             <span class="comment">// try to evict 1 stream if possible
             // if max allow is 0, this won&#39;t be able to evict,
             // and then we&#39;ll just bail after
             </span><span class="kw">if let </span><span class="prelude-val">Some</span>(evicted) = <span class="self">self</span>.pending_reset_expired.pop(stream.store_mut()) {
                 counts.transition_after(evicted, <span class="bool-val">true</span>);
             }
         }

         <span class="kw">if </span>counts.can_inc_num_reset_streams() {
             counts.inc_num_reset_streams();
             <span class="self">self</span>.pending_reset_expired.push(stream);
         }
     }

     <span class="doccomment">/// Send any pending refusals.
     </span><span class="kw">pub fn </span>send_pending_refusal&lt;T, B&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;mut </span>Context,
         dst: <span class="kw-2">&amp;mut </span>Codec&lt;T, Prioritized&lt;B&gt;&gt;,
     ) -&gt; Poll&lt;io::Result&lt;()&gt;&gt;
     <span class="kw">where
         </span>T: AsyncWrite + Unpin,
         B: Buf,
     {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(stream_id) = <span class="self">self</span>.refused {
             <span class="macro">ready!</span>(dst.poll_ready(cx))<span class="question-mark">?</span>;

             <span class="comment">// Create the RST_STREAM frame
             </span><span class="kw">let </span>frame = frame::Reset::new(stream_id, Reason::REFUSED_STREAM);

             <span class="comment">// Buffer the frame
             </span>dst.buffer(frame.into()).expect(<span class="string">&quot;invalid RST_STREAM frame&quot;</span>);
         }

         <span class="self">self</span>.refused = <span class="prelude-val">None</span>;

         Poll::Ready(<span class="prelude-val">Ok</span>(()))
     }

     <span class="kw">pub fn </span>clear_expired_reset_streams(<span class="kw-2">&amp;mut </span><span class="self">self</span>, store: <span class="kw-2">&amp;mut </span>Store, counts: <span class="kw-2">&amp;mut </span>Counts) {
         <span class="kw">if </span>!<span class="self">self</span>.pending_reset_expired.is_empty() {
             <span class="kw">let </span>now = Instant::now();
             <span class="kw">let </span>reset_duration = <span class="self">self</span>.reset_duration;
             <span class="kw">while let </span><span class="prelude-val">Some</span>(stream) = <span class="self">self</span>.pending_reset_expired.pop_if(store, |stream| {
                 <span class="kw">let </span>reset_at = stream.reset_at.expect(<span class="string">&quot;reset_at must be set if in queue&quot;</span>);
                 <span class="comment">// rust-lang/rust#86470 tracks a bug in the standard library where `Instant`
                 // subtraction can panic (because, on some platforms, `Instant` isn&#39;t actually
                 // monotonic). We use a saturating operation to avoid this panic here.
                 </span>now.saturating_duration_since(reset_at) &gt; reset_duration
             }) {
                 counts.transition_after(stream, <span class="bool-val">true</span>);
             }
         }
     }

     <span class="kw">pub fn </span>clear_queues(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         clear_pending_accept: bool,
         store: <span class="kw-2">&amp;mut </span>Store,
         counts: <span class="kw-2">&amp;mut </span>Counts,
     ) {
         <span class="self">self</span>.clear_stream_window_update_queue(store, counts);
         <span class="self">self</span>.clear_all_reset_streams(store, counts);

         <span class="kw">if </span>clear_pending_accept {
             <span class="self">self</span>.clear_all_pending_accept(store, counts);
         }
     }

     <span class="kw">fn </span>clear_stream_window_update_queue(<span class="kw-2">&amp;mut </span><span class="self">self</span>, store: <span class="kw-2">&amp;mut </span>Store, counts: <span class="kw-2">&amp;mut </span>Counts) {
         <span class="kw">while let </span><span class="prelude-val">Some</span>(stream) = <span class="self">self</span>.pending_window_updates.pop(store) {
             counts.transition(stream, |<span class="kw">_</span>, stream| {
                 <span class="macro">tracing::trace!</span>(<span class="string">&quot;clear_stream_window_update_queue; stream={:?}&quot;</span>, stream.id);
             })
         }
     }

     <span class="doccomment">/// Called on EOF
     </span><span class="kw">fn </span>clear_all_reset_streams(<span class="kw-2">&amp;mut </span><span class="self">self</span>, store: <span class="kw-2">&amp;mut </span>Store, counts: <span class="kw-2">&amp;mut </span>Counts) {
         <span class="kw">while let </span><span class="prelude-val">Some</span>(stream) = <span class="self">self</span>.pending_reset_expired.pop(store) {
             counts.transition_after(stream, <span class="bool-val">true</span>);
         }
     }

     <span class="kw">fn </span>clear_all_pending_accept(<span class="kw-2">&amp;mut </span><span class="self">self</span>, store: <span class="kw-2">&amp;mut </span>Store, counts: <span class="kw-2">&amp;mut </span>Counts) {
         <span class="kw">while let </span><span class="prelude-val">Some</span>(stream) = <span class="self">self</span>.pending_accept.pop(store) {
             counts.transition_after(stream, <span class="bool-val">false</span>);
         }
     }

     <span class="kw">pub fn </span>poll_complete&lt;T, B&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;mut </span>Context,
         store: <span class="kw-2">&amp;mut </span>Store,
         counts: <span class="kw-2">&amp;mut </span>Counts,
         dst: <span class="kw-2">&amp;mut </span>Codec&lt;T, Prioritized&lt;B&gt;&gt;,
     ) -&gt; Poll&lt;io::Result&lt;()&gt;&gt;
     <span class="kw">where
         </span>T: AsyncWrite + Unpin,
         B: Buf,
     {
         <span class="comment">// Send any pending connection level window updates
         </span><span class="macro">ready!</span>(<span class="self">self</span>.send_connection_window_update(cx, dst))<span class="question-mark">?</span>;

         <span class="comment">// Send any pending stream level window updates
         </span><span class="macro">ready!</span>(<span class="self">self</span>.send_stream_window_updates(cx, store, counts, dst))<span class="question-mark">?</span>;

         Poll::Ready(<span class="prelude-val">Ok</span>(()))
     }

     <span class="doccomment">/// Send connection level window update
     </span><span class="kw">fn </span>send_connection_window_update&lt;T, B&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;mut </span>Context,
         dst: <span class="kw-2">&amp;mut </span>Codec&lt;T, Prioritized&lt;B&gt;&gt;,
     ) -&gt; Poll&lt;io::Result&lt;()&gt;&gt;
     <span class="kw">where
         </span>T: AsyncWrite + Unpin,
         B: Buf,
     {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(incr) = <span class="self">self</span>.flow.unclaimed_capacity() {
             <span class="kw">let </span>frame = frame::WindowUpdate::new(StreamId::zero(), incr);

             <span class="comment">// Ensure the codec has capacity
             </span><span class="macro">ready!</span>(dst.poll_ready(cx))<span class="question-mark">?</span>;

             <span class="comment">// Buffer the WINDOW_UPDATE frame
             </span>dst.buffer(frame.into())
                 .expect(<span class="string">&quot;invalid WINDOW_UPDATE frame&quot;</span>);

             <span class="comment">// Update flow control
             </span><span class="self">self</span>.flow
                 .inc_window(incr)
                 .expect(<span class="string">&quot;unexpected flow control state&quot;</span>);
         }

         Poll::Ready(<span class="prelude-val">Ok</span>(()))
     }

     <span class="doccomment">/// Send stream level window update
     </span><span class="kw">pub fn </span>send_stream_window_updates&lt;T, B&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;mut </span>Context,
         store: <span class="kw-2">&amp;mut </span>Store,
         counts: <span class="kw-2">&amp;mut </span>Counts,
         dst: <span class="kw-2">&amp;mut </span>Codec&lt;T, Prioritized&lt;B&gt;&gt;,
     ) -&gt; Poll&lt;io::Result&lt;()&gt;&gt;
     <span class="kw">where
         </span>T: AsyncWrite + Unpin,
         B: Buf,
     {
         <span class="kw">loop </span>{
             <span class="comment">// Ensure the codec has capacity
             </span><span class="macro">ready!</span>(dst.poll_ready(cx))<span class="question-mark">?</span>;

             <span class="comment">// Get the next stream
             </span><span class="kw">let </span>stream = <span class="kw">match </span><span class="self">self</span>.pending_window_updates.pop(store) {
                 <span class="prelude-val">Some</span>(stream) =&gt; stream,
                 <span class="prelude-val">None </span>=&gt; <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(())),
             };

             counts.transition(stream, |<span class="kw">_</span>, stream| {
                 <span class="macro">tracing::trace!</span>(<span class="string">&quot;pending_window_updates -- pop; stream={:?}&quot;</span>, stream.id);
                 <span class="macro">debug_assert!</span>(!stream.is_pending_window_update);

                 <span class="kw">if </span>!stream.state.is_recv_streaming() {
                     <span class="comment">// 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...
                     </span><span class="kw">return</span>;
                 }

                 <span class="comment">// TODO: de-dup
                 </span><span class="kw">if let </span><span class="prelude-val">Some</span>(incr) = stream.recv_flow.unclaimed_capacity() {
                     <span class="comment">// Create the WINDOW_UPDATE frame
                     </span><span class="kw">let </span>frame = frame::WindowUpdate::new(stream.id, incr);

                     <span class="comment">// Buffer it
                     </span>dst.buffer(frame.into())
                         .expect(<span class="string">&quot;invalid WINDOW_UPDATE frame&quot;</span>);

                     <span class="comment">// Update flow control
                     </span>stream
                         .recv_flow
                         .inc_window(incr)
                         .expect(<span class="string">&quot;unexpected flow control state&quot;</span>);
                 }
             })
         }
     }

     <span class="kw">pub fn </span>next_incoming(<span class="kw-2">&amp;mut </span><span class="self">self</span>, store: <span class="kw-2">&amp;mut </span>Store) -&gt; <span class="prelude-ty">Option</span>&lt;store::Key&gt; {
         <span class="self">self</span>.pending_accept.pop(store).map(|ptr| ptr.key())
     }

     <span class="kw">pub fn </span>poll_data(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;</span>Context,
         stream: <span class="kw-2">&amp;mut </span>Stream,
     ) -&gt; Poll&lt;<span class="prelude-ty">Option</span>&lt;<span class="prelude-ty">Result</span>&lt;Bytes, proto::Error&gt;&gt;&gt; {
         <span class="kw">match </span>stream.pending_recv.pop_front(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer) {
             <span class="prelude-val">Some</span>(Event::Data(payload)) =&gt; Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(payload))),
             <span class="prelude-val">Some</span>(event) =&gt; {
                 <span class="comment">// Frame is trailer
                 </span>stream.pending_recv.push_front(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer, event);

                 <span class="comment">// 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&#39;t really much of a
                 // performance concern. It also means we don&#39;t have to track
                 // state to see if `poll_trailers` was called before `poll_data`
                 // returned `None`.
                 </span>stream.notify_recv();

                 <span class="comment">// No more data frames
                 </span>Poll::Ready(<span class="prelude-val">None</span>)
             }
             <span class="prelude-val">None </span>=&gt; <span class="self">self</span>.schedule_recv(cx, stream),
         }
     }

     <span class="kw">pub fn </span>poll_trailers(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;</span>Context,
         stream: <span class="kw-2">&amp;mut </span>Stream,
     ) -&gt; Poll&lt;<span class="prelude-ty">Option</span>&lt;<span class="prelude-ty">Result</span>&lt;HeaderMap, proto::Error&gt;&gt;&gt; {
         <span class="kw">match </span>stream.pending_recv.pop_front(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer) {
             <span class="prelude-val">Some</span>(Event::Trailers(trailers)) =&gt; Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(trailers))),
             <span class="prelude-val">Some</span>(event) =&gt; {
                 <span class="comment">// Frame is not trailers.. not ready to poll trailers yet.
                 </span>stream.pending_recv.push_front(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buffer, event);

                 Poll::Pending
             }
             <span class="prelude-val">None </span>=&gt; <span class="self">self</span>.schedule_recv(cx, stream),
         }
     }

     <span class="kw">fn </span>schedule_recv&lt;T&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;</span>Context,
         stream: <span class="kw-2">&amp;mut </span>Stream,
     ) -&gt; Poll&lt;<span class="prelude-ty">Option</span>&lt;<span class="prelude-ty">Result</span>&lt;T, proto::Error&gt;&gt;&gt; {
         <span class="kw">if </span>stream.state.ensure_recv_open()<span class="question-mark">? </span>{
             <span class="comment">// Request to get notified once more frames arrive
             </span>stream.recv_task = <span class="prelude-val">Some</span>(cx.waker().clone());
             Poll::Pending
         } <span class="kw">else </span>{
             <span class="comment">// No more frames will be received
             </span>Poll::Ready(<span class="prelude-val">None</span>)
         }
     }
 }

 <span class="comment">// ===== impl Open =====

 </span><span class="kw">impl </span>Open {
     <span class="kw">pub fn </span>is_push_promise(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="macro">matches!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="self">Self</span>::PushPromise)
     }
 }

 <span class="comment">// ===== impl RecvHeaderBlockError =====

 </span><span class="kw">impl</span>&lt;T&gt; From&lt;Error&gt; <span class="kw">for </span>RecvHeaderBlockError&lt;T&gt; {
     <span class="kw">fn </span>from(err: Error) -&gt; <span class="self">Self </span>{
         RecvHeaderBlockError::State(err)
     }
 }
 </code></pre></div>
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