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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<Message>,
messages: VecDeque<Message>,
buf: BytesMut,
codec: Codec,
closing: bool,
}
<span class="doccomment">/// A stream of Messages from a websocket client
///
/// Messages can be accessed via the stream's `.next()` method
</span><span class="kw">pub struct </span>MessageStream {
payload: Payload,
messages: VecDeque<Message>,
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<Message>) -> <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) -> <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">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="prelude-ty">Result</span><Message, ProtocolError>> {
poll_fn(|cx| Pin::new(<span class="kw-2">&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><Bytes, Error>;
<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>> {
<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">&mut </span>this.session_rx).poll_recv(cx) {
Poll::Ready(<span class="prelude-val">Some</span>(msg)) => {
this.messages.push_back(msg);
}
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) {
<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><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>> {
<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's nothing left to read
</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))) => {
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>;
<span class="kw">break</span>;
}
Poll::Pending => <span class="kw">break</span>,
}
}
}
<span class="comment">// Create messages until there'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">&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>