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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 `actix-ws/src/fut.rs`."><title>fut.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-9ee3a5e31a2afa3e.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="actix_ws" data-themes="" data-resource-suffix="" data-rustdoc-version="1.75.0-nightly (0f44eb32f 2023-11-09)" data-channel="nightly" data-search-js="search-8fbf244ebcf71464.js" data-settings-js="settings-74424d7eec62a23e.js" ><script src="../../static.files/storage-fec3eaa3851e447d.js"></script><script defer src="../../static.files/src-script-3280b574d94e47b4.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-9dd44ab47b99a0fb.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-5d8b3c7633ad77ba.css"></noscript><link rel="icon" href="https://actix.rs/favicon.ico"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><nav class="sub"><a class="sub-logo-container" href="../../actix_ws/index.html"><img src="https://actix.rs/img/logo.png" alt="actix_ws"></a><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" 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="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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</pre></div><pre class="rust"><code><span class="kw">use </span>std::{
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collections::VecDeque,
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future::poll_fn,
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io,
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pin::Pin,
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task::{Context, Poll},
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};
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<span class="kw">use </span>actix_codec::{Decoder, Encoder};
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<span class="kw">use </span>actix_http::{
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ws::{Codec, Frame, Message, ProtocolError},
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Payload,
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};
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<span class="kw">use </span>actix_web::{
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web::{Bytes, BytesMut},
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Error,
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};
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<span class="kw">use </span>futures_core::stream::Stream;
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<span class="kw">use </span>tokio::sync::mpsc::Receiver;
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<span class="doccomment">/// A response body for Websocket HTTP Requests
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</span><span class="kw">pub struct </span>StreamingBody {
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session_rx: Receiver<Message>,
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messages: VecDeque<Message>,
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buf: BytesMut,
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codec: Codec,
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closing: bool,
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}
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<span class="doccomment">/// A stream of Messages from a websocket client
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///
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/// Messages can be accessed via the stream's `.next()` method
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</span><span class="kw">pub struct </span>MessageStream {
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payload: Payload,
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messages: VecDeque<Message>,
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buf: BytesMut,
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codec: Codec,
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closing: bool,
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}
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<span class="kw">impl </span>StreamingBody {
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<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(session_rx: Receiver<Message>) -> <span class="self">Self </span>{
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StreamingBody {
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session_rx,
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messages: VecDeque::new(),
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buf: BytesMut::new(),
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codec: Codec::new(),
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closing: <span class="bool-val">false</span>,
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}
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}
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}
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<span class="kw">impl </span>MessageStream {
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<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(payload: Payload) -> <span class="self">Self </span>{
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MessageStream {
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payload,
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messages: VecDeque::new(),
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buf: BytesMut::new(),
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codec: Codec::new(),
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closing: <span class="bool-val">false</span>,
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}
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}
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<span class="doccomment">/// Wait for the next item from the message stream
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///
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/// ```rust,ignore
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/// while let Some(Ok(msg)) = stream.recv().await {
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/// // handle message
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/// }
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/// ```
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</span><span class="kw">pub async fn </span>recv(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="prelude-ty">Result</span><Message, ProtocolError>> {
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poll_fn(|cx| Pin::new(<span class="kw-2">&mut *</span><span class="self">self</span>).poll_next(cx)).<span class="kw">await
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</span>}
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}
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<span class="kw">impl </span>Stream <span class="kw">for </span>StreamingBody {
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<span class="kw">type </span>Item = <span class="prelude-ty">Result</span><Bytes, Error>;
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<span class="kw">fn </span>poll_next(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Option</span><<span class="self">Self</span>::Item>> {
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<span class="kw">let </span>this = <span class="self">self</span>.get_mut();
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<span class="kw">if </span>this.closing {
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<span class="kw">return </span>Poll::Ready(<span class="prelude-val">None</span>);
|
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}
|
||
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<span class="kw">loop </span>{
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<span class="kw">match </span>Pin::new(<span class="kw-2">&mut </span>this.session_rx).poll_recv(cx) {
|
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Poll::Ready(<span class="prelude-val">Some</span>(msg)) => {
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this.messages.push_back(msg);
|
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}
|
||
Poll::Ready(<span class="prelude-val">None</span>) => {
|
||
this.closing = <span class="bool-val">true</span>;
|
||
<span class="kw">break</span>;
|
||
}
|
||
Poll::Pending => <span class="kw">break</span>,
|
||
}
|
||
}
|
||
|
||
<span class="kw">while let </span><span class="prelude-val">Some</span>(msg) = this.messages.pop_front() {
|
||
<span class="kw">if let </span><span class="prelude-val">Err</span>(e) = this.codec.encode(msg, <span class="kw-2">&mut </span>this.buf) {
|
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<span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(e.into())));
|
||
}
|
||
}
|
||
|
||
<span class="kw">if </span>!this.buf.is_empty() {
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<span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(this.buf.split().freeze())));
|
||
}
|
||
|
||
Poll::Pending
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl </span>Stream <span class="kw">for </span>MessageStream {
|
||
<span class="kw">type </span>Item = <span class="prelude-ty">Result</span><Message, ProtocolError>;
|
||
|
||
<span class="kw">fn </span>poll_next(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Option</span><<span class="self">Self</span>::Item>> {
|
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<span class="kw">let </span>this = <span class="self">self</span>.get_mut();
|
||
|
||
<span class="comment">// Return the first message in the queue if one exists
|
||
//
|
||
// This is faster than polling and parsing
|
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</span><span class="kw">if let </span><span class="prelude-val">Some</span>(msg) = this.messages.pop_front() {
|
||
<span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(msg)));
|
||
}
|
||
|
||
<span class="kw">if </span>!this.closing {
|
||
<span class="comment">// Read in bytes until there's nothing left to read
|
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</span><span class="kw">loop </span>{
|
||
<span class="kw">match </span>Pin::new(<span class="kw-2">&mut </span>this.payload).poll_next(cx) {
|
||
Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(bytes))) => {
|
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this.buf.extend_from_slice(<span class="kw-2">&</span>bytes);
|
||
}
|
||
Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(e))) => {
|
||
<span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(ProtocolError::Io(io::Error::new(
|
||
io::ErrorKind::Other,
|
||
e.to_string(),
|
||
)))));
|
||
}
|
||
Poll::Ready(<span class="prelude-val">None</span>) => {
|
||
this.closing = <span class="bool-val">true</span>;
|
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<span class="kw">break</span>;
|
||
}
|
||
Poll::Pending => <span class="kw">break</span>,
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="comment">// Create messages until there's no more bytes left
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</span><span class="kw">while let </span><span class="prelude-val">Some</span>(frame) = this.codec.decode(<span class="kw-2">&mut </span>this.buf)<span class="question-mark">? </span>{
|
||
<span class="kw">let </span>message = <span class="kw">match </span>frame {
|
||
Frame::Text(bytes) => {
|
||
<span class="kw">let </span>s = std::str::from_utf8(<span class="kw-2">&</span>bytes)
|
||
.map_err(|e| {
|
||
ProtocolError::Io(io::Error::new(io::ErrorKind::Other, e.to_string()))
|
||
})<span class="question-mark">?
|
||
</span>.to_string();
|
||
Message::Text(s.into())
|
||
}
|
||
Frame::Binary(bytes) => Message::Binary(bytes),
|
||
Frame::Ping(bytes) => Message::Ping(bytes),
|
||
Frame::Pong(bytes) => Message::Pong(bytes),
|
||
Frame::Close(reason) => Message::Close(reason),
|
||
Frame::Continuation(item) => Message::Continuation(item),
|
||
};
|
||
|
||
this.messages.push_back(message);
|
||
}
|
||
|
||
<span class="comment">// Return the first message in the queue
|
||
</span><span class="kw">if let </span><span class="prelude-val">Some</span>(msg) = this.messages.pop_front() {
|
||
<span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(msg)));
|
||
}
|
||
|
||
<span class="comment">// If we've exhausted our message queue and we're closing, close the stream
|
||
</span><span class="kw">if </span>this.closing {
|
||
<span class="kw">return </span>Poll::Ready(<span class="prelude-val">None</span>);
|
||
}
|
||
|
||
Poll::Pending
|
||
}
|
||
}
|
||
</code></pre></div></section></main></body></html> |