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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/prioritize.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>prioritize.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">super</span>::store::Resolve;
 <span class="kw">use super</span>::<span class="kw-2">*</span>;

 <span class="kw">use </span><span class="kw">crate</span>::frame::{Reason, StreamId};

 <span class="kw">use </span><span class="kw">crate</span>::codec::UserError;
 <span class="kw">use </span><span class="kw">crate</span>::codec::UserError::<span class="kw-2">*</span>;

 <span class="kw">use </span>bytes::buf::{Buf, Take};
 <span class="kw">use </span>std::{
     cmp::{<span class="self">self</span>, Ordering},
     fmt, io, mem,
     task::{Context, Poll, Waker},
 };

 <span class="doccomment">/// # Warning
 ///
 /// Queued streams are ordered by stream ID, as we need to ensure that
 /// lower-numbered streams are sent headers before higher-numbered ones.
 /// This is because &quot;idle&quot; stream IDs – those which have been initiated but
 /// have yet to receive frames – will be implicitly closed on receipt of a
 /// frame on a higher stream ID. If these queues was not ordered by stream
 /// IDs, some mechanism would be necessary to ensure that the lowest-numbered]
 /// idle stream is opened first.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Prioritize {
     <span class="doccomment">/// Queue of streams waiting for socket capacity to send a frame.
     </span>pending_send: store::Queue&lt;stream::NextSend&gt;,

     <span class="doccomment">/// Queue of streams waiting for window capacity to produce data.
     </span>pending_capacity: store::Queue&lt;stream::NextSendCapacity&gt;,

     <span class="doccomment">/// Streams waiting for capacity due to max concurrency
     ///
     /// The `SendRequest` handle is `Clone`. This enables initiating requests
     /// from many tasks. However, offering this capability while supporting
     /// backpressure at some level is tricky. If there are many `SendRequest`
     /// handles and a single stream becomes available, which handle gets
     /// assigned that stream? Maybe that handle is no longer ready to send a
     /// request.
     ///
     /// The strategy used is to allow each `SendRequest` handle one buffered
     /// request. A `SendRequest` handle is ready to send a request if it has no
     /// associated buffered requests. This is the same strategy as `mpsc` in the
     /// futures library.
     </span>pending_open: store::Queue&lt;stream::NextOpen&gt;,

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

     <span class="doccomment">/// Stream ID of the last stream opened.
     </span>last_opened_id: StreamId,

     <span class="doccomment">/// What `DATA` frame is currently being sent in the codec.
     </span>in_flight_data_frame: InFlightData,

     <span class="doccomment">/// The maximum amount of bytes a stream should buffer.
     </span>max_buffer_size: usize,
 }

 <span class="attribute">#[derive(Debug, Eq, PartialEq)]
 </span><span class="kw">enum </span>InFlightData {
     <span class="doccomment">/// There is no `DATA` frame in flight.
     </span>Nothing,
     <span class="doccomment">/// There is a `DATA` frame in flight belonging to the given stream.
     </span>DataFrame(store::Key),
     <span class="doccomment">/// There was a `DATA` frame, but the stream&#39;s queue was since cleared.
     </span>Drop,
 }

 <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Prioritized&lt;B&gt; {
     <span class="comment">// The buffer
     </span>inner: Take&lt;B&gt;,

     end_of_stream: bool,

     <span class="comment">// The stream that this is associated with
     </span>stream: store::Key,
 }

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

 </span><span class="kw">impl </span>Prioritize {
     <span class="kw">pub fn </span>new(config: <span class="kw-2">&amp;</span>Config) -&gt; Prioritize {
         <span class="kw">let </span><span class="kw-2">mut </span>flow = FlowControl::new();

         flow.inc_window(config.remote_init_window_sz)
             .expect(<span class="string">&quot;invalid initial window size&quot;</span>);

         flow.assign_capacity(config.remote_init_window_sz);

         <span class="macro">tracing::trace!</span>(<span class="string">&quot;Prioritize::new; flow={:?}&quot;</span>, flow);

         Prioritize {
             pending_send: store::Queue::new(),
             pending_capacity: store::Queue::new(),
             pending_open: store::Queue::new(),
             flow,
             last_opened_id: StreamId::ZERO,
             in_flight_data_frame: InFlightData::Nothing,
             max_buffer_size: config.local_max_buffer_size,
         }
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>max_buffer_size(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.max_buffer_size
     }

     <span class="doccomment">/// Queue a frame to be sent to the remote
     </span><span class="kw">pub fn </span>queue_frame&lt;B&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         frame: Frame&lt;B&gt;,
         buffer: <span class="kw-2">&amp;mut </span>Buffer&lt;Frame&lt;B&gt;&gt;,
         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="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(<span class="string">&quot;Prioritize::queue_frame&quot;</span>, <span class="question-mark">?</span>stream.id);
         <span class="kw">let </span>_e = span.enter();
         <span class="comment">// Queue the frame in the buffer
         </span>stream.pending_send.push_back(buffer, frame);
         <span class="self">self</span>.schedule_send(stream, task);
     }

     <span class="kw">pub fn </span>schedule_send(<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="comment">// If the stream is waiting to be opened, nothing more to do.
         </span><span class="kw">if </span>stream.is_send_ready() {
             <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>stream.id, <span class="string">&quot;schedule_send&quot;</span>);
             <span class="comment">// Queue the stream
             </span><span class="self">self</span>.pending_send.push(stream);

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

     <span class="kw">pub fn </span>queue_open(<span class="kw-2">&amp;mut </span><span class="self">self</span>, stream: <span class="kw-2">&amp;mut </span>store::Ptr) {
         <span class="self">self</span>.pending_open.push(stream);
     }

     <span class="doccomment">/// Send a data frame
     </span><span class="kw">pub fn </span>send_data&lt;B&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         frame: frame::Data&lt;B&gt;,
         buffer: <span class="kw-2">&amp;mut </span>Buffer&lt;Frame&lt;B&gt;&gt;,
         stream: <span class="kw-2">&amp;mut </span>store::Ptr,
         counts: <span class="kw-2">&amp;mut </span>Counts,
         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="kw">where
         </span>B: Buf,
     {
         <span class="kw">let </span>sz = frame.payload().remaining();

         <span class="kw">if </span>sz &gt; MAX_WINDOW_SIZE <span class="kw">as </span>usize {
             <span class="kw">return </span><span class="prelude-val">Err</span>(UserError::PayloadTooBig);
         }

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

         <span class="kw">if </span>!stream.state.is_send_streaming() {
             <span class="kw">if </span>stream.state.is_closed() {
                 <span class="kw">return </span><span class="prelude-val">Err</span>(InactiveStreamId);
             } <span class="kw">else </span>{
                 <span class="kw">return </span><span class="prelude-val">Err</span>(UnexpectedFrameType);
             }
         }

         <span class="comment">// Update the buffered data counter
         </span>stream.buffered_send_data += sz <span class="kw">as </span>usize;

         <span class="kw">let </span>span =
             <span class="macro">tracing::trace_span!</span>(<span class="string">&quot;send_data&quot;</span>, sz, requested = stream.requested_send_capacity);
         <span class="kw">let </span>_e = span.enter();
         <span class="macro">tracing::trace!</span>(buffered = stream.buffered_send_data);

         <span class="comment">// Implicitly request more send capacity if not enough has been
         // requested yet.
         </span><span class="kw">if </span>(stream.requested_send_capacity <span class="kw">as </span>usize) &lt; stream.buffered_send_data {
             <span class="comment">// Update the target requested capacity
             </span>stream.requested_send_capacity =
                 cmp::min(stream.buffered_send_data, WindowSize::MAX <span class="kw">as </span>usize) <span class="kw">as </span>WindowSize;

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

         <span class="kw">if </span>frame.is_end_stream() {
             stream.state.send_close();
             <span class="self">self</span>.reserve_capacity(<span class="number">0</span>, stream, counts);
         }

         <span class="macro">tracing::trace!</span>(
             available = %stream.send_flow.available(),
             buffered = stream.buffered_send_data,
         );

         <span class="comment">// The `stream.buffered_send_data == 0` check is here so that, if a zero
         // length data frame is queued to the front (there is no previously
         // queued data), it gets sent out immediately even if there is no
         // available send window.
         //
         // Sending out zero length data frames can be done to signal
         // end-of-stream.
         //
         </span><span class="kw">if </span>stream.send_flow.available() &gt; <span class="number">0 </span>|| stream.buffered_send_data == <span class="number">0 </span>{
             <span class="comment">// The stream currently has capacity to send the data frame, so
             // queue it up and notify the connection task.
             </span><span class="self">self</span>.queue_frame(frame.into(), buffer, stream, task);
         } <span class="kw">else </span>{
             <span class="comment">// The stream has no capacity to send the frame now, save it but
             // don&#39;t notify the connection task. Once additional capacity
             // becomes available, the frame will be flushed.
             </span>stream.pending_send.push_back(buffer, frame.into());
         }

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

     <span class="doccomment">/// Request capacity to send data
     </span><span class="kw">pub fn </span>reserve_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,
         counts: <span class="kw-2">&amp;mut </span>Counts,
     ) {
         <span class="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(
             <span class="string">&quot;reserve_capacity&quot;</span>,
             <span class="question-mark">?</span>stream.id,
             requested = capacity,
             effective = (capacity <span class="kw">as </span>usize) + stream.buffered_send_data,
             curr = stream.requested_send_capacity
         );
         <span class="kw">let </span>_e = span.enter();

         <span class="comment">// Actual capacity is `capacity` + the current amount of buffered data.
         // If it were less, then we could never send out the buffered data.
         </span><span class="kw">let </span>capacity = (capacity <span class="kw">as </span>usize) + stream.buffered_send_data;

         <span class="kw">match </span>capacity.cmp(<span class="kw-2">&amp;</span>(stream.requested_send_capacity <span class="kw">as </span>usize)) {
             Ordering::Equal =&gt; {
                 <span class="comment">// Nothing to do
             </span>}
             Ordering::Less =&gt; {
                 <span class="comment">// Update the target requested capacity
                 </span>stream.requested_send_capacity = capacity <span class="kw">as </span>WindowSize;

                 <span class="comment">// Currently available capacity assigned to the stream
                 </span><span class="kw">let </span>available = stream.send_flow.available().as_size();

                 <span class="comment">// If the stream has more assigned capacity than requested, reclaim
                 // some for the connection
                 </span><span class="kw">if </span>available <span class="kw">as </span>usize &gt; capacity {
                     <span class="kw">let </span>diff = available - capacity <span class="kw">as </span>WindowSize;

                     stream.send_flow.claim_capacity(diff);

                     <span class="self">self</span>.assign_connection_capacity(diff, stream, counts);
                 }
             }
             Ordering::Greater =&gt; {
                 <span class="comment">// If trying to *add* capacity, but the stream send side is closed,
                 // there&#39;s nothing to be done.
                 </span><span class="kw">if </span>stream.state.is_send_closed() {
                     <span class="kw">return</span>;
                 }

                 <span class="comment">// Update the target requested capacity
                 </span>stream.requested_send_capacity =
                     cmp::min(capacity, WindowSize::MAX <span class="kw">as </span>usize) <span class="kw">as </span>WindowSize;

                 <span class="comment">// Try to assign additional capacity to the stream. If none is
                 // currently available, the stream will be queued to receive some
                 // when more becomes available.
                 </span><span class="self">self</span>.try_assign_capacity(stream);
             }
         }
     }

     <span class="kw">pub fn </span>recv_stream_window_update(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         inc: WindowSize,
         stream: <span class="kw-2">&amp;mut </span>store::Ptr,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), Reason&gt; {
         <span class="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(
             <span class="string">&quot;recv_stream_window_update&quot;</span>,
             <span class="question-mark">?</span>stream.id,
             <span class="question-mark">?</span>stream.state,
             inc,
             flow = <span class="question-mark">?</span>stream.send_flow
         );
         <span class="kw">let </span>_e = span.enter();

         <span class="kw">if </span>stream.state.is_send_closed() &amp;&amp; stream.buffered_send_data == <span class="number">0 </span>{
             <span class="comment">// We can&#39;t send any data, so don&#39;t bother doing anything else.
             </span><span class="kw">return </span><span class="prelude-val">Ok</span>(());
         }

         <span class="comment">// Update the stream level flow control.
         </span>stream.send_flow.inc_window(inc)<span class="question-mark">?</span>;

         <span class="comment">// If the stream is waiting on additional capacity, then this will
         // assign it (if available on the connection) and notify the producer
         </span><span class="self">self</span>.try_assign_capacity(stream);

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

     <span class="kw">pub fn </span>recv_connection_window_update(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         inc: WindowSize,
         store: <span class="kw-2">&amp;mut </span>Store,
         counts: <span class="kw-2">&amp;mut </span>Counts,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), Reason&gt; {
         <span class="comment">// Update the connection&#39;s window
         </span><span class="self">self</span>.flow.inc_window(inc)<span class="question-mark">?</span>;

         <span class="self">self</span>.assign_connection_capacity(inc, store, counts);
         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Reclaim all capacity assigned to the stream and re-assign it to the
     /// connection
     </span><span class="kw">pub fn </span>reclaim_all_capacity(<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">let </span>available = stream.send_flow.available().as_size();
         <span class="kw">if </span>available &gt; <span class="number">0 </span>{
             stream.send_flow.claim_capacity(available);
             <span class="comment">// Re-assign all capacity to the connection
             </span><span class="self">self</span>.assign_connection_capacity(available, stream, counts);
         }
     }

     <span class="doccomment">/// Reclaim just reserved capacity, not buffered capacity, and re-assign
     /// it to the connection
     </span><span class="kw">pub fn </span>reclaim_reserved_capacity(<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="comment">// only reclaim requested capacity that isn&#39;t already buffered
         </span><span class="kw">if </span>stream.requested_send_capacity <span class="kw">as </span>usize &gt; stream.buffered_send_data {
             <span class="kw">let </span>reserved = stream.requested_send_capacity - stream.buffered_send_data <span class="kw">as </span>WindowSize;

             stream.send_flow.claim_capacity(reserved);
             <span class="self">self</span>.assign_connection_capacity(reserved, stream, counts);
         }
     }

     <span class="kw">pub fn </span>clear_pending_capacity(<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">let </span>span = <span class="macro">tracing::trace_span!</span>(<span class="string">&quot;clear_pending_capacity&quot;</span>);
         <span class="kw">let </span>_e = span.enter();
         <span class="kw">while let </span><span class="prelude-val">Some</span>(stream) = <span class="self">self</span>.pending_capacity.pop(store) {
             counts.transition(stream, |<span class="kw">_</span>, stream| {
                 <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>stream.id, <span class="string">&quot;clear_pending_capacity&quot;</span>);
             })
         }
     }

     <span class="kw">pub fn </span>assign_connection_capacity&lt;R&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         inc: WindowSize,
         store: <span class="kw-2">&amp;mut </span>R,
         counts: <span class="kw-2">&amp;mut </span>Counts,
     ) <span class="kw">where
         </span>R: Resolve,
     {
         <span class="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(<span class="string">&quot;assign_connection_capacity&quot;</span>, inc);
         <span class="kw">let </span>_e = span.enter();

         <span class="self">self</span>.flow.assign_capacity(inc);

         <span class="comment">// Assign newly acquired capacity to streams pending capacity.
         </span><span class="kw">while </span><span class="self">self</span>.flow.available() &gt; <span class="number">0 </span>{
             <span class="kw">let </span>stream = <span class="kw">match </span><span class="self">self</span>.pending_capacity.pop(store) {
                 <span class="prelude-val">Some</span>(stream) =&gt; stream,
                 <span class="prelude-val">None </span>=&gt; <span class="kw">return</span>,
             };

             <span class="comment">// Streams pending capacity may have been reset before capacity
             // became available. In that case, the stream won&#39;t want any
             // capacity, and so we shouldn&#39;t &quot;transition&quot; on it, but just evict
             // it and continue the loop.
             </span><span class="kw">if </span>!(stream.state.is_send_streaming() || stream.buffered_send_data &gt; <span class="number">0</span>) {
                 <span class="kw">continue</span>;
             }

             counts.transition(stream, |<span class="kw">_</span>, stream| {
                 <span class="comment">// Try to assign capacity to the stream. This will also re-queue the
                 // stream if there isn&#39;t enough connection level capacity to fulfill
                 // the capacity request.
                 </span><span class="self">self</span>.try_assign_capacity(stream);
             })
         }
     }

     <span class="doccomment">/// Request capacity to send data
     </span><span class="kw">fn </span>try_assign_capacity(<span class="kw-2">&amp;mut </span><span class="self">self</span>, stream: <span class="kw-2">&amp;mut </span>store::Ptr) {
         <span class="kw">let </span>total_requested = stream.requested_send_capacity;

         <span class="comment">// Total requested should never go below actual assigned
         // (Note: the window size can go lower than assigned)
         </span><span class="macro">debug_assert!</span>(stream.send_flow.available() &lt;= total_requested <span class="kw">as </span>usize);

         <span class="comment">// The amount of additional capacity that the stream requests.
         // Don&#39;t assign more than the window has available!
         </span><span class="kw">let </span>additional = cmp::min(
             total_requested - stream.send_flow.available().as_size(),
             <span class="comment">// Can&#39;t assign more than what is available
             </span>stream.send_flow.window_size() - stream.send_flow.available().as_size(),
         );
         <span class="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(<span class="string">&quot;try_assign_capacity&quot;</span>, <span class="question-mark">?</span>stream.id);
         <span class="kw">let </span>_e = span.enter();
         <span class="macro">tracing::trace!</span>(
             requested = total_requested,
             additional,
             buffered = stream.buffered_send_data,
             window = stream.send_flow.window_size(),
             conn = %<span class="self">self</span>.flow.available()
         );

         <span class="kw">if </span>additional == <span class="number">0 </span>{
             <span class="comment">// Nothing more to do
             </span><span class="kw">return</span>;
         }

         <span class="comment">// If the stream has requested capacity, then it must be in the
         // streaming state (more data could be sent) or there is buffered data
         // waiting to be sent.
         </span><span class="macro">debug_assert!</span>(
             stream.state.is_send_streaming() || stream.buffered_send_data &gt; <span class="number">0</span>,
             <span class="string">&quot;state={:?}&quot;</span>,
             stream.state
         );

         <span class="comment">// The amount of currently available capacity on the connection
         </span><span class="kw">let </span>conn_available = <span class="self">self</span>.flow.available().as_size();

         <span class="comment">// First check if capacity is immediately available
         </span><span class="kw">if </span>conn_available &gt; <span class="number">0 </span>{
             <span class="comment">// The amount of capacity to assign to the stream
             // TODO: Should prioritization factor into this?
             </span><span class="kw">let </span>assign = cmp::min(conn_available, additional);

             <span class="macro">tracing::trace!</span>(capacity = assign, <span class="string">&quot;assigning&quot;</span>);

             <span class="comment">// Assign the capacity to the stream
             </span>stream.assign_capacity(assign, <span class="self">self</span>.max_buffer_size);

             <span class="comment">// Claim the capacity from the connection
             </span><span class="self">self</span>.flow.claim_capacity(assign);
         }

         <span class="macro">tracing::trace!</span>(
             available = %stream.send_flow.available(),
             requested = stream.requested_send_capacity,
             buffered = stream.buffered_send_data,
             has_unavailable = %stream.send_flow.has_unavailable()
         );

         <span class="kw">if </span>stream.send_flow.available() &lt; stream.requested_send_capacity <span class="kw">as </span>usize
             &amp;&amp; stream.send_flow.has_unavailable()
         {
             <span class="comment">// The stream requires additional capacity and the stream&#39;s
             // window has available capacity, but the connection window
             // does not.
             //
             // In this case, the stream needs to be queued up for when the
             // connection has more capacity.
             </span><span class="self">self</span>.pending_capacity.push(stream);
         }

         <span class="comment">// If data is buffered and the stream is send ready, then
         // schedule the stream for execution
         </span><span class="kw">if </span>stream.buffered_send_data &gt; <span class="number">0 </span>&amp;&amp; stream.is_send_ready() {
             <span class="comment">// TODO: This assertion isn&#39;t *exactly* correct. There can still be
             // buffered send data while the stream&#39;s pending send queue is
             // empty. This can happen when a large data frame is in the process
             // of being **partially** sent. Once the window has been sent, the
             // data frame will be returned to the prioritization layer to be
             // re-scheduled.
             //
             // That said, it would be nice to figure out how to make this
             // assertion correctly.
             //
             // debug_assert!(!stream.pending_send.is_empty());

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

     <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,
         buffer: <span class="kw-2">&amp;mut </span>Buffer&lt;Frame&lt;B&gt;&gt;,
         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">// Ensure codec is ready
         </span><span class="macro">ready!</span>(dst.poll_ready(cx))<span class="question-mark">?</span>;

         <span class="comment">// Reclaim any frame that has previously been written
         </span><span class="self">self</span>.reclaim_frame(buffer, store, dst);

         <span class="comment">// The max frame length
         </span><span class="kw">let </span>max_frame_len = dst.max_send_frame_size();

         <span class="macro">tracing::trace!</span>(<span class="string">&quot;poll_complete&quot;</span>);

         <span class="kw">loop </span>{
             <span class="self">self</span>.schedule_pending_open(store, counts);

             <span class="kw">match </span><span class="self">self</span>.pop_frame(buffer, store, max_frame_len, counts) {
                 <span class="prelude-val">Some</span>(frame) =&gt; {
                     <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>frame, <span class="string">&quot;writing&quot;</span>);

                     <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.in_flight_data_frame, InFlightData::Nothing);
                     <span class="kw">if let </span>Frame::Data(<span class="kw-2">ref </span>frame) = frame {
                         <span class="self">self</span>.in_flight_data_frame = InFlightData::DataFrame(frame.payload().stream);
                     }
                     dst.buffer(frame).expect(<span class="string">&quot;invalid frame&quot;</span>);

                     <span class="comment">// Ensure the codec is ready to try the loop again.
                     </span><span class="macro">ready!</span>(dst.poll_ready(cx))<span class="question-mark">?</span>;

                     <span class="comment">// Because, always try to reclaim...
                     </span><span class="self">self</span>.reclaim_frame(buffer, store, dst);
                 }
                 <span class="prelude-val">None </span>=&gt; {
                     <span class="comment">// Try to flush the codec.
                     </span><span class="macro">ready!</span>(dst.flush(cx))<span class="question-mark">?</span>;

                     <span class="comment">// This might release a data frame...
                     </span><span class="kw">if </span>!<span class="self">self</span>.reclaim_frame(buffer, store, dst) {
                         <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(()));
                     }

                     <span class="comment">// No need to poll ready as poll_complete() does this for
                     // us...
                 </span>}
             }
         }
     }

     <span class="doccomment">/// Tries to reclaim a pending data frame from the codec.
     ///
     /// Returns true if a frame was reclaimed.
     ///
     /// When a data frame is written to the codec, it may not be written in its
     /// entirety (large chunks are split up into potentially many data frames).
     /// In this case, the stream needs to be reprioritized.
     </span><span class="kw">fn </span>reclaim_frame&lt;T, B&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         buffer: <span class="kw-2">&amp;mut </span>Buffer&lt;Frame&lt;B&gt;&gt;,
         store: <span class="kw-2">&amp;mut </span>Store,
         dst: <span class="kw-2">&amp;mut </span>Codec&lt;T, Prioritized&lt;B&gt;&gt;,
     ) -&gt; bool
     <span class="kw">where
         </span>B: Buf,
     {
         <span class="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(<span class="string">&quot;try_reclaim_frame&quot;</span>);
         <span class="kw">let </span>_e = span.enter();

         <span class="comment">// First check if there are any data chunks to take back
         </span><span class="kw">if let </span><span class="prelude-val">Some</span>(frame) = dst.take_last_data_frame() {
             <span class="self">self</span>.reclaim_frame_inner(buffer, store, frame)
         } <span class="kw">else </span>{
             <span class="bool-val">false
         </span>}
     }

     <span class="kw">fn </span>reclaim_frame_inner&lt;B&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         buffer: <span class="kw-2">&amp;mut </span>Buffer&lt;Frame&lt;B&gt;&gt;,
         store: <span class="kw-2">&amp;mut </span>Store,
         frame: frame::Data&lt;Prioritized&lt;B&gt;&gt;,
     ) -&gt; bool
     <span class="kw">where
         </span>B: Buf,
     {
         <span class="macro">tracing::trace!</span>(
             <span class="question-mark">?</span>frame,
             sz = frame.payload().inner.get_ref().remaining(),
             <span class="string">&quot;reclaimed&quot;
         </span>);

         <span class="kw">let </span><span class="kw-2">mut </span>eos = <span class="bool-val">false</span>;
         <span class="kw">let </span>key = frame.payload().stream;

         <span class="kw">match </span>mem::replace(<span class="kw-2">&amp;mut </span><span class="self">self</span>.in_flight_data_frame, InFlightData::Nothing) {
             InFlightData::Nothing =&gt; <span class="macro">panic!</span>(<span class="string">&quot;wasn&#39;t expecting a frame to reclaim&quot;</span>),
             InFlightData::Drop =&gt; {
                 <span class="macro">tracing::trace!</span>(<span class="string">&quot;not reclaiming frame for cancelled stream&quot;</span>);
                 <span class="kw">return </span><span class="bool-val">false</span>;
             }
             InFlightData::DataFrame(k) =&gt; {
                 <span class="macro">debug_assert_eq!</span>(k, key);
             }
         }

         <span class="kw">let </span><span class="kw-2">mut </span>frame = frame.map(|prioritized| {
             <span class="comment">// TODO: Ensure fully written
             </span>eos = prioritized.end_of_stream;
             prioritized.inner.into_inner()
         });

         <span class="kw">if </span>frame.payload().has_remaining() {
             <span class="kw">let </span><span class="kw-2">mut </span>stream = store.resolve(key);

             <span class="kw">if </span>eos {
                 frame.set_end_stream(<span class="bool-val">true</span>);
             }

             <span class="self">self</span>.push_back_frame(frame.into(), buffer, <span class="kw-2">&amp;mut </span>stream);

             <span class="kw">return </span><span class="bool-val">true</span>;
         }

         <span class="bool-val">false
     </span>}

     <span class="doccomment">/// Push the frame to the front of the stream&#39;s deque, scheduling the
     /// stream if needed.
     </span><span class="kw">fn </span>push_back_frame&lt;B&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         frame: Frame&lt;B&gt;,
         buffer: <span class="kw-2">&amp;mut </span>Buffer&lt;Frame&lt;B&gt;&gt;,
         stream: <span class="kw-2">&amp;mut </span>store::Ptr,
     ) {
         <span class="comment">// Push the frame to the front of the stream&#39;s deque
         </span>stream.pending_send.push_front(buffer, frame);

         <span class="comment">// If needed, schedule the sender
         </span><span class="kw">if </span>stream.send_flow.available() &gt; <span class="number">0 </span>{
             <span class="macro">debug_assert!</span>(!stream.pending_send.is_empty());
             <span class="self">self</span>.pending_send.push(stream);
         }
     }

     <span class="kw">pub fn </span>clear_queue&lt;B&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, buffer: <span class="kw-2">&amp;mut </span>Buffer&lt;Frame&lt;B&gt;&gt;, stream: <span class="kw-2">&amp;mut </span>store::Ptr) {
         <span class="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(<span class="string">&quot;clear_queue&quot;</span>, <span class="question-mark">?</span>stream.id);
         <span class="kw">let </span>_e = span.enter();

         <span class="comment">// TODO: make this more efficient?
         </span><span class="kw">while let </span><span class="prelude-val">Some</span>(frame) = stream.pending_send.pop_front(buffer) {
             <span class="macro">tracing::trace!</span>(<span class="question-mark">?</span>frame, <span class="string">&quot;dropping&quot;</span>);
         }

         stream.buffered_send_data = <span class="number">0</span>;
         stream.requested_send_capacity = <span class="number">0</span>;
         <span class="kw">if let </span>InFlightData::DataFrame(key) = <span class="self">self</span>.in_flight_data_frame {
             <span class="kw">if </span>stream.key() == key {
                 <span class="comment">// This stream could get cleaned up now - don&#39;t allow the buffered frame to get reclaimed.
                 </span><span class="self">self</span>.in_flight_data_frame = InFlightData::Drop;
             }
         }
     }

     <span class="kw">pub fn </span>clear_pending_send(<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_send.pop(store) {
             <span class="kw">let </span>is_pending_reset = stream.is_pending_reset_expiration();
             counts.transition_after(stream, is_pending_reset);
         }
     }

     <span class="kw">pub fn </span>clear_pending_open(<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_open.pop(store) {
             <span class="kw">let </span>is_pending_reset = stream.is_pending_reset_expiration();
             counts.transition_after(stream, is_pending_reset);
         }
     }

     <span class="kw">fn </span>pop_frame&lt;B&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         buffer: <span class="kw-2">&amp;mut </span>Buffer&lt;Frame&lt;B&gt;&gt;,
         store: <span class="kw-2">&amp;mut </span>Store,
         max_len: usize,
         counts: <span class="kw-2">&amp;mut </span>Counts,
     ) -&gt; <span class="prelude-ty">Option</span>&lt;Frame&lt;Prioritized&lt;B&gt;&gt;&gt;
     <span class="kw">where
         </span>B: Buf,
     {
         <span class="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(<span class="string">&quot;pop_frame&quot;</span>);
         <span class="kw">let </span>_e = span.enter();

         <span class="kw">loop </span>{
             <span class="kw">match </span><span class="self">self</span>.pending_send.pop(store) {
                 <span class="prelude-val">Some</span>(<span class="kw-2">mut </span>stream) =&gt; {
                     <span class="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(<span class="string">&quot;popped&quot;</span>, <span class="question-mark">?</span>stream.id, <span class="question-mark">?</span>stream.state);
                     <span class="kw">let </span>_e = span.enter();

                     <span class="comment">// It&#39;s possible that this stream, besides having data to send,
                     // is also queued to send a reset, and thus is already in the queue
                     // to wait for &quot;some time&quot; after a reset.
                     //
                     // To be safe, we just always ask the stream.
                     </span><span class="kw">let </span>is_pending_reset = stream.is_pending_reset_expiration();

                     <span class="macro">tracing::trace!</span>(is_pending_reset);

                     <span class="kw">let </span>frame = <span class="kw">match </span>stream.pending_send.pop_front(buffer) {
                         <span class="prelude-val">Some</span>(Frame::Data(<span class="kw-2">mut </span>frame)) =&gt; {
                             <span class="comment">// Get the amount of capacity remaining for stream&#39;s
                             // window.
                             </span><span class="kw">let </span>stream_capacity = stream.send_flow.available();
                             <span class="kw">let </span>sz = frame.payload().remaining();

                             <span class="macro">tracing::trace!</span>(
                                 sz,
                                 eos = frame.is_end_stream(),
                                 window = %stream_capacity,
                                 available = %stream.send_flow.available(),
                                 requested = stream.requested_send_capacity,
                                 buffered = stream.buffered_send_data,
                                 <span class="string">&quot;data frame&quot;
                             </span>);

                             <span class="comment">// Zero length data frames always have capacity to
                             // be sent.
                             </span><span class="kw">if </span>sz &gt; <span class="number">0 </span>&amp;&amp; stream_capacity == <span class="number">0 </span>{
                                 <span class="macro">tracing::trace!</span>(<span class="string">&quot;stream capacity is 0&quot;</span>);

                                 <span class="comment">// Ensure that the stream is waiting for
                                 // connection level capacity
                                 //
                                 // TODO: uncomment
                                 // debug_assert!(stream.is_pending_send_capacity);

                                 // The stream has no more capacity, this can
                                 // happen if the remote reduced the stream
                                 // window. In this case, we need to buffer the
                                 // frame and wait for a window update...
                                 </span>stream.pending_send.push_front(buffer, frame.into());

                                 <span class="kw">continue</span>;
                             }

                             <span class="comment">// Only send up to the max frame length
                             </span><span class="kw">let </span>len = cmp::min(sz, max_len);

                             <span class="comment">// Only send up to the stream&#39;s window capacity
                             </span><span class="kw">let </span>len =
                                 cmp::min(len, stream_capacity.as_size() <span class="kw">as </span>usize) <span class="kw">as </span>WindowSize;

                             <span class="comment">// There *must* be be enough connection level
                             // capacity at this point.
                             </span><span class="macro">debug_assert!</span>(len &lt;= <span class="self">self</span>.flow.window_size());

                             <span class="comment">// Check if the stream level window the peer knows is available. In some
                             // scenarios, maybe the window we know is available but the window which
                             // peer knows is not.
                             </span><span class="kw">if </span>len &gt; <span class="number">0 </span>&amp;&amp; len &gt; stream.send_flow.window_size() {
                                 stream.pending_send.push_front(buffer, frame.into());
                                 <span class="kw">continue</span>;
                             }

                             <span class="macro">tracing::trace!</span>(len, <span class="string">&quot;sending data frame&quot;</span>);

                             <span class="comment">// Update the flow control
                             </span><span class="macro">tracing::trace_span!</span>(<span class="string">&quot;updating stream flow&quot;</span>).in_scope(|| {
                                 stream.send_data(len, <span class="self">self</span>.max_buffer_size);

                                 <span class="comment">// Assign the capacity back to the connection that
                                 // was just consumed from the stream in the previous
                                 // line.
                                 </span><span class="self">self</span>.flow.assign_capacity(len);
                             });

                             <span class="kw">let </span>(eos, len) = <span class="macro">tracing::trace_span!</span>(<span class="string">&quot;updating connection flow&quot;</span>)
                                 .in_scope(|| {
                                     <span class="self">self</span>.flow.send_data(len);

                                     <span class="comment">// Wrap the frame&#39;s data payload to ensure that the
                                     // correct amount of data gets written.

                                     </span><span class="kw">let </span>eos = frame.is_end_stream();
                                     <span class="kw">let </span>len = len <span class="kw">as </span>usize;

                                     <span class="kw">if </span>frame.payload().remaining() &gt; len {
                                         frame.set_end_stream(<span class="bool-val">false</span>);
                                     }
                                     (eos, len)
                                 });

                             Frame::Data(frame.map(|buf| Prioritized {
                                 inner: buf.take(len),
                                 end_of_stream: eos,
                                 stream: stream.key(),
                             }))
                         }
                         <span class="prelude-val">Some</span>(Frame::PushPromise(pp)) =&gt; {
                             <span class="kw">let </span><span class="kw-2">mut </span>pushed =
                                 stream.store_mut().find_mut(<span class="kw-2">&amp;</span>pp.promised_id()).unwrap();
                             pushed.is_pending_push = <span class="bool-val">false</span>;
                             <span class="comment">// Transition stream from pending_push to pending_open
                             // if possible
                             </span><span class="kw">if </span>!pushed.pending_send.is_empty() {
                                 <span class="kw">if </span>counts.can_inc_num_send_streams() {
                                     counts.inc_num_send_streams(<span class="kw-2">&amp;mut </span>pushed);
                                     <span class="self">self</span>.pending_send.push(<span class="kw-2">&amp;mut </span>pushed);
                                 } <span class="kw">else </span>{
                                     <span class="self">self</span>.queue_open(<span class="kw-2">&amp;mut </span>pushed);
                                 }
                             }
                             Frame::PushPromise(pp)
                         }
                         <span class="prelude-val">Some</span>(frame) =&gt; frame.map(|<span class="kw">_</span>| {
                             <span class="macro">unreachable!</span>(
                                 <span class="string">&quot;Frame::map closure will only be called \
                                  on DATA frames.&quot;
                             </span>)
                         }),
                         <span class="prelude-val">None </span>=&gt; {
                             <span class="kw">if let </span><span class="prelude-val">Some</span>(reason) = stream.state.get_scheduled_reset() {
                                 <span class="kw">let </span>stream_id = stream.id;
                                 stream
                                     .state
                                     .set_reset(stream_id, reason, Initiator::Library);

                                 <span class="kw">let </span>frame = frame::Reset::new(stream.id, reason);
                                 Frame::Reset(frame)
                             } <span class="kw">else </span>{
                                 <span class="comment">// If the stream receives a RESET from the peer, it may have
                                 // had data buffered to be sent, but all the frames are cleared
                                 // in clear_queue(). Instead of doing O(N) traversal through queue
                                 // to remove, lets just ignore the stream here.
                                 </span><span class="macro">tracing::trace!</span>(<span class="string">&quot;removing dangling stream from pending_send&quot;</span>);
                                 <span class="comment">// Since this should only happen as a consequence of `clear_queue`,
                                 // we must be in a closed state of some kind.
                                 </span><span class="macro">debug_assert!</span>(stream.state.is_closed());
                                 counts.transition_after(stream, is_pending_reset);
                                 <span class="kw">continue</span>;
                             }
                         }
                     };

                     <span class="macro">tracing::trace!</span>(<span class="string">&quot;pop_frame; frame={:?}&quot;</span>, frame);

                     <span class="kw">if </span><span class="macro">cfg!</span>(debug_assertions) &amp;&amp; stream.state.is_idle() {
                         <span class="macro">debug_assert!</span>(stream.id &gt; <span class="self">self</span>.last_opened_id);
                         <span class="self">self</span>.last_opened_id = stream.id;
                     }

                     <span class="kw">if </span>!stream.pending_send.is_empty() || stream.state.is_scheduled_reset() {
                         <span class="comment">// TODO: Only requeue the sender IF it is ready to send
                         // the next frame. i.e. don&#39;t requeue it if the next
                         // frame is a data frame and the stream does not have
                         // any more capacity.
                         </span><span class="self">self</span>.pending_send.push(<span class="kw-2">&amp;mut </span>stream);
                     }

                     counts.transition_after(stream, is_pending_reset);

                     <span class="kw">return </span><span class="prelude-val">Some</span>(frame);
                 }
                 <span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">None</span>,
             }
         }
     }

     <span class="kw">fn </span>schedule_pending_open(<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="macro">tracing::trace!</span>(<span class="string">&quot;schedule_pending_open&quot;</span>);
         <span class="comment">// check for any pending open streams
         </span><span class="kw">while </span>counts.can_inc_num_send_streams() {
             <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">mut </span>stream) = <span class="self">self</span>.pending_open.pop(store) {
                 <span class="macro">tracing::trace!</span>(<span class="string">&quot;schedule_pending_open; stream={:?}&quot;</span>, stream.id);

                 counts.inc_num_send_streams(<span class="kw-2">&amp;mut </span>stream);
                 <span class="self">self</span>.pending_send.push(<span class="kw-2">&amp;mut </span>stream);
                 stream.notify_send();
             } <span class="kw">else </span>{
                 <span class="kw">return</span>;
             }
         }
     }
 }

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

 </span><span class="kw">impl</span>&lt;B&gt; Buf <span class="kw">for </span>Prioritized&lt;B&gt;
 <span class="kw">where
     </span>B: Buf,
 {
     <span class="kw">fn </span>remaining(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.inner.remaining()
     }

     <span class="kw">fn </span>chunk(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
         <span class="self">self</span>.inner.chunk()
     }

     <span class="kw">fn </span>chunks_vectored&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="self">self</span>, dst: <span class="kw-2">&amp;mut </span>[std::io::IoSlice&lt;<span class="lifetime">&#39;a</span>&gt;]) -&gt; usize {
         <span class="self">self</span>.inner.chunks_vectored(dst)
     }

     <span class="kw">fn </span>advance(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cnt: usize) {
         <span class="self">self</span>.inner.advance(cnt)
     }
 }

 <span class="kw">impl</span>&lt;B: Buf&gt; fmt::Debug <span class="kw">for </span>Prioritized&lt;B&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         fmt.debug_struct(<span class="string">&quot;Prioritized&quot;</span>)
             .field(<span class="string">&quot;remaining&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.inner.get_ref().remaining())
             .field(<span class="string">&quot;end_of_stream&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.end_of_stream)
             .field(<span class="string">&quot;stream&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.stream)
             .finish()
     }
 }
 </code></pre></div>
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