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</pre></div><pre class="rust"><code><span class="kw">use </span>std::{
collections::VecDeque,
future::poll_fn,
io,
pin::Pin,
task::{Context, Poll},
};
<span class="kw">use </span>actix_codec::{Decoder, Encoder};
<span class="kw">use </span>actix_http::{
ws::{Codec, Frame, Message, ProtocolError},
Payload,
};
<span class="kw">use </span>actix_web::{
web::{Bytes, BytesMut},
Error,
};
<span class="kw">use </span>futures_core::stream::Stream;
<span class="kw">use </span>tokio::sync::mpsc::Receiver;
<span class="doccomment">/// A response body for Websocket HTTP Requests
</span><span class="kw">pub struct </span>StreamingBody {
session_rx: Receiver&lt;Message&gt;,
messages: VecDeque&lt;Message&gt;,
buf: BytesMut,
codec: Codec,
closing: bool,
}
<span class="doccomment">/// A stream of Messages from a websocket client
///
/// Messages can be accessed via the stream&#39;s `.next()` method
</span><span class="kw">pub struct </span>MessageStream {
payload: Payload,
messages: VecDeque&lt;Message&gt;,
buf: BytesMut,
codec: Codec,
closing: bool,
}
<span class="kw">impl </span>StreamingBody {
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(session_rx: Receiver&lt;Message&gt;) -&gt; <span class="self">Self </span>{
StreamingBody {
session_rx,
messages: VecDeque::new(),
buf: BytesMut::new(),
codec: Codec::new(),
closing: <span class="bool-val">false</span>,
}
}
}
<span class="kw">impl </span>MessageStream {
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(payload: Payload) -&gt; <span class="self">Self </span>{
MessageStream {
payload,
messages: VecDeque::new(),
buf: BytesMut::new(),
codec: Codec::new(),
closing: <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Wait for the next item from the message stream
///
/// ```rust,ignore
/// while let Some(Ok(msg)) = stream.recv().await {
/// // handle message
/// }
/// ```
</span><span class="kw">pub async fn </span>recv(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="prelude-ty">Result</span>&lt;Message, ProtocolError&gt;&gt; {
poll_fn(|cx| Pin::new(<span class="kw-2">&amp;mut *</span><span class="self">self</span>).poll_next(cx)).<span class="kw">await
</span>}
}
<span class="kw">impl </span>Stream <span class="kw">for </span>StreamingBody {
<span class="kw">type </span>Item = <span class="prelude-ty">Result</span>&lt;Bytes, Error&gt;;
<span class="kw">fn </span>poll_next(<span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt;&gt; {
<span class="kw">let </span>this = <span class="self">self</span>.get_mut();
<span class="kw">if </span>this.closing {
<span class="kw">return </span>Poll::Ready(<span class="prelude-val">None</span>);
}
<span class="kw">loop </span>{
<span class="kw">match </span>Pin::new(<span class="kw-2">&amp;mut </span>this.session_rx).poll_recv(cx) {
Poll::Ready(<span class="prelude-val">Some</span>(msg)) =&gt; {
this.messages.push_back(msg);
}
Poll::Ready(<span class="prelude-val">None</span>) =&gt; {
this.closing = <span class="bool-val">true</span>;
<span class="kw">break</span>;
}
Poll::Pending =&gt; <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">&amp;mut </span>this.buf) {
<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() {
<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>&lt;Message, ProtocolError&gt;;
<span class="kw">fn </span>poll_next(<span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt;&gt; {
<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
</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&#39;s nothing left to read
</span><span class="kw">loop </span>{
<span class="kw">match </span>Pin::new(<span class="kw-2">&amp;mut </span>this.payload).poll_next(cx) {
Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(bytes))) =&gt; {
this.buf.extend_from_slice(<span class="kw-2">&amp;</span>bytes);
}
Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(e))) =&gt; {
<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>) =&gt; {
this.closing = <span class="bool-val">true</span>;
<span class="kw">break</span>;
}
Poll::Pending =&gt; <span class="kw">break</span>,
}
}
}
<span class="comment">// Create messages until there&#39;s no more bytes left
</span><span class="kw">while let </span><span class="prelude-val">Some</span>(frame) = this.codec.decode(<span class="kw-2">&amp;mut </span>this.buf)<span class="question-mark">? </span>{
<span class="kw">let </span>message = <span class="kw">match </span>frame {
Frame::Text(bytes) =&gt; {
<span class="kw">let </span>s = std::str::from_utf8(<span class="kw-2">&amp;</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) =&gt; Message::Binary(bytes),
Frame::Ping(bytes) =&gt; Message::Ping(bytes),
Frame::Pong(bytes) =&gt; Message::Pong(bytes),
Frame::Close(reason) =&gt; Message::Close(reason),
Frame::Continuation(item) =&gt; 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&#39;ve exhausted our message queue and we&#39;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>

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</pre></div><pre class="rust"><code><span class="doccomment">//! WebSockets for Actix Web, without actors.
//!
//! For usage, see documentation on [`handle()`].
</span><span class="attr">#![deny(rust_2018_idioms, nonstandard_style, future_incompatible)]
#![warn(missing_docs)]
#![doc(html_logo_url = <span class="string">&quot;https://actix.rs/img/logo.png&quot;</span>)]
#![doc(html_favicon_url = <span class="string">&quot;https://actix.rs/favicon.ico&quot;</span>)]
#![cfg_attr(docsrs, feature(doc_auto_cfg))]
</span><span class="kw">pub use </span>actix_http::ws::{CloseCode, CloseReason, Message, ProtocolError};
<span class="kw">use </span>actix_http::{
body::{BodyStream, MessageBody},
ws::handshake,
};
<span class="kw">use </span>actix_web::{web, HttpRequest, HttpResponse};
<span class="kw">use </span>tokio::sync::mpsc::channel;
<span class="kw">mod </span>fut;
<span class="kw">mod </span>session;
<span class="kw">pub use </span><span class="self">self</span>::{
fut::{MessageStream, StreamingBody},
session::{Closed, Session},
};
<span class="doccomment">/// Begin handling websocket traffic
///
/// ```no_run
/// use actix_web::{middleware::Logger, web, App, Error, HttpRequest, HttpResponse, HttpServer};
/// use actix_ws::Message;
/// use futures::stream::StreamExt as _;
///
/// async fn ws(req: HttpRequest, body: web::Payload) -&gt; Result&lt;HttpResponse, Error&gt; {
/// let (response, mut session, mut msg_stream) = actix_ws::handle(&amp;req, body)?;
///
/// actix_rt::spawn(async move {
/// while let Some(Ok(msg)) = msg_stream.next().await {
/// match msg {
/// Message::Ping(bytes) =&gt; {
/// if session.pong(&amp;bytes).await.is_err() {
/// return;
/// }
/// }
/// Message::Text(s) =&gt; println!(&quot;Got text, {}&quot;, s),
/// _ =&gt; break,
/// }
/// }
///
/// let _ = session.close(None).await;
/// });
///
/// Ok(response)
/// }
///
/// #[actix_rt::main]
/// async fn main() -&gt; Result&lt;(), anyhow::Error&gt; {
/// HttpServer::new(move || {
/// App::new()
/// .wrap(Logger::default())
/// .route(&quot;/ws&quot;, web::get().to(ws))
/// })
/// .bind(&quot;127.0.0.1:8080&quot;)?
/// .run()
/// .await?;
///
/// Ok(())
/// }
/// ```
</span><span class="kw">pub fn </span>handle(
req: <span class="kw-2">&amp;</span>HttpRequest,
body: web::Payload,
) -&gt; <span class="prelude-ty">Result</span>&lt;(HttpResponse, Session, MessageStream), actix_web::Error&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>response = handshake(req.head())<span class="question-mark">?</span>;
<span class="kw">let </span>(tx, rx) = channel(<span class="number">32</span>);
<span class="prelude-val">Ok</span>((
response
.message_body(BodyStream::new(StreamingBody::new(rx)).boxed())<span class="question-mark">?
</span>.into(),
Session::new(tx),
MessageStream::new(body.into_inner()),
))
}
</code></pre></div></section></main></body></html>

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</pre></div><pre class="rust"><code><span class="kw">use </span>std::sync::{
atomic::{AtomicBool, Ordering},
Arc,
};
<span class="kw">use </span>actix_http::ws::{CloseReason, Message};
<span class="kw">use </span>actix_web::web::Bytes;
<span class="kw">use </span>bytestring::ByteString;
<span class="kw">use </span>tokio::sync::mpsc::Sender;
<span class="doccomment">/// A handle into the websocket session.
///
/// This type can be used to send messages into the websocket.
</span><span class="attr">#[derive(Clone)]
</span><span class="kw">pub struct </span>Session {
inner: <span class="prelude-ty">Option</span>&lt;Sender&lt;Message&gt;&gt;,
closed: Arc&lt;AtomicBool&gt;,
}
<span class="doccomment">/// The error representing a closed websocket session
</span><span class="attr">#[derive(Debug)]
</span><span class="kw">pub struct </span>Closed;
<span class="kw">impl </span>std::fmt::Display <span class="kw">for </span>Closed {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>std::fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; std::fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;Session is closed&quot;</span>)
}
}
<span class="kw">impl </span>std::error::Error <span class="kw">for </span>Closed {}
<span class="kw">impl </span>Session {
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(inner: Sender&lt;Message&gt;) -&gt; <span class="self">Self </span>{
Session {
inner: <span class="prelude-val">Some</span>(inner),
closed: Arc::new(AtomicBool::new(<span class="bool-val">false</span>)),
}
}
<span class="kw">fn </span>pre_check(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<span class="kw">if </span><span class="self">self</span>.closed.load(Ordering::Relaxed) {
<span class="self">self</span>.inner.take();
}
}
<span class="doccomment">/// Send text into the websocket
///
/// ```rust,ignore
/// if session.text(&quot;Some text&quot;).await.is_err() {
/// // session closed
/// }
/// ```
</span><span class="kw">pub async fn </span>text(<span class="kw-2">&amp;mut </span><span class="self">self</span>, msg: <span class="kw">impl </span>Into&lt;ByteString&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;(), Closed&gt; {
<span class="self">self</span>.pre_check();
<span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = <span class="self">self</span>.inner.as_mut() {
inner
.send(Message::Text(msg.into()))
.<span class="kw">await
</span>.map_err(|<span class="kw">_</span>| Closed)
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(Closed)
}
}
<span class="doccomment">/// Send raw bytes into the websocket
///
/// ```rust,ignore
/// if session.binary(b&quot;some bytes&quot;).await.is_err() {
/// // session closed
/// }
/// ```
</span><span class="kw">pub async fn </span>binary(<span class="kw-2">&amp;mut </span><span class="self">self</span>, msg: <span class="kw">impl </span>Into&lt;Bytes&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;(), Closed&gt; {
<span class="self">self</span>.pre_check();
<span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = <span class="self">self</span>.inner.as_mut() {
inner
.send(Message::Binary(msg.into()))
.<span class="kw">await
</span>.map_err(|<span class="kw">_</span>| Closed)
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(Closed)
}
}
<span class="doccomment">/// Ping the client
///
/// For many applications, it will be important to send regular pings to keep track of if the
/// client has disconnected
///
/// ```rust,ignore
/// if session.ping(b&quot;&quot;).await.is_err() {
/// // session is closed
/// }
/// ```
</span><span class="kw">pub async fn </span>ping(<span class="kw-2">&amp;mut </span><span class="self">self</span>, msg: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;(), Closed&gt; {
<span class="self">self</span>.pre_check();
<span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = <span class="self">self</span>.inner.as_mut() {
inner
.send(Message::Ping(Bytes::copy_from_slice(msg)))
.<span class="kw">await
</span>.map_err(|<span class="kw">_</span>| Closed)
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(Closed)
}
}
<span class="doccomment">/// Pong the client
///
/// ```rust,ignore
/// match msg {
/// Message::Ping(bytes) =&gt; {
/// let _ = session.pong(&amp;bytes).await;
/// }
/// _ =&gt; (),
/// }
</span><span class="kw">pub async fn </span>pong(<span class="kw-2">&amp;mut </span><span class="self">self</span>, msg: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;(), Closed&gt; {
<span class="self">self</span>.pre_check();
<span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = <span class="self">self</span>.inner.as_mut() {
inner
.send(Message::Pong(Bytes::copy_from_slice(msg)))
.<span class="kw">await
</span>.map_err(|<span class="kw">_</span>| Closed)
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(Closed)
}
}
<span class="doccomment">/// Send a close message, and consume the session
///
/// All clones will return `Err(Closed)` if used after this call
///
/// ```rust,ignore
/// session.close(None).await
/// ```
</span><span class="kw">pub async fn </span>close(<span class="kw-2">mut </span><span class="self">self</span>, reason: <span class="prelude-ty">Option</span>&lt;CloseReason&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;(), Closed&gt; {
<span class="self">self</span>.pre_check();
<span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = <span class="self">self</span>.inner.take() {
<span class="self">self</span>.closed.store(<span class="bool-val">true</span>, Ordering::Relaxed);
inner.send(Message::Close(reason)).<span class="kw">await</span>.map_err(|<span class="kw">_</span>| Closed)
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(Closed)
}
}
}
</code></pre></div></section></main></body></html>