airio_yamux/
lib.rs

1use airio_core::{StreamMuxer, Upgrade, UpgradeInfo, muxing::StreamMuxerEvent};
2use futures::{AsyncRead, AsyncWrite, future, ready};
3use std::{
4    collections::VecDeque,
5    io, iter,
6    pin::Pin,
7    task::{Context, Poll, Waker},
8};
9
10pub use yamux::{Config, Connection, ConnectionError, Mode, Stream};
11
12#[derive(Debug)]
13pub struct Muxer<C> {
14    connection: Connection<C>,
15    inbound_stream_buffer: VecDeque<Stream>,
16    inbound_stream_waker: Option<Waker>,
17}
18
19impl<C> Muxer<C>
20where
21    C: AsyncRead + AsyncWrite + Unpin + 'static,
22{
23    pub fn new(connection: Connection<C>) -> Self {
24        Muxer {
25            connection,
26            inbound_stream_buffer: VecDeque::with_capacity(MAX_BUFFERED_INBOUND_STREAMS),
27            inbound_stream_waker: None,
28        }
29    }
30}
31
32const MAX_BUFFERED_INBOUND_STREAMS: usize = 256;
33
34impl<C> StreamMuxer for Muxer<C>
35where
36    C: AsyncRead + AsyncWrite + Unpin + 'static,
37{
38    type Substream = Stream;
39    type Error = ConnectionError;
40
41    fn poll_inbound(
42        mut self: Pin<&mut Self>,
43        cx: &mut Context<'_>,
44    ) -> Poll<Result<Self::Substream, Self::Error>> {
45        if let Some(stream) = self.inbound_stream_buffer.pop_front() {
46            return Poll::Ready(Ok(stream));
47        }
48        self.inbound_stream_waker = Some(cx.waker().clone());
49        Poll::Pending
50    }
51
52    fn poll_outbound(
53        mut self: Pin<&mut Self>,
54        cx: &mut Context<'_>,
55    ) -> Poll<Result<Self::Substream, Self::Error>> {
56        self.as_mut().connection.poll_new_outbound(cx)
57    }
58
59    fn poll(
60        mut self: Pin<&mut Self>,
61        cx: &mut Context<'_>,
62    ) -> Poll<Result<StreamMuxerEvent, Self::Error>> {
63        let mut this = self.as_mut();
64        let inbound_stream = ready!(this.connection.poll_next_inbound(cx))
65            .ok_or_else(|| ConnectionError::Closed)??;
66
67        if this.inbound_stream_buffer.len() >= MAX_BUFFERED_INBOUND_STREAMS {
68            tracing::warn!(
69                "Inbound stream buffer is full, dropping stream: {}",
70                inbound_stream.id()
71            );
72            drop(inbound_stream);
73        } else {
74            this.inbound_stream_buffer.push_back(inbound_stream);
75            if let Some(waker) = this.inbound_stream_waker.take() {
76                waker.wake();
77            }
78        }
79        // 马上唤醒任务
80        cx.waker().wake_by_ref();
81        Poll::Pending
82    }
83
84    #[tracing::instrument(level = "trace", name = "StreamMuxer::poll_close", skip(self, cx))]
85    fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
86        self.as_mut().connection.poll_close(cx)
87    }
88}
89
90#[derive(Debug, Clone)]
91pub struct UpgradeConfig(Config);
92
93impl From<Config> for UpgradeConfig {
94    fn from(config: Config) -> Self {
95        UpgradeConfig(config)
96    }
97}
98
99impl Default for UpgradeConfig {
100    fn default() -> Self {
101        UpgradeConfig(Config::default())
102    }
103}
104
105impl UpgradeInfo for UpgradeConfig {
106    type Info = &'static str;
107    type InfoIter = iter::Once<Self::Info>;
108
109    fn protocol_info(&self) -> Self::InfoIter {
110        iter::once("/v1/yamux")
111    }
112}
113
114impl<C> Upgrade<C> for UpgradeConfig
115where
116    C: AsyncRead + AsyncWrite + Send + Unpin + 'static,
117{
118    type Output = Muxer<C>;
119    type Error = io::Error;
120    type Future = future::Ready<Result<Self::Output, Self::Error>>;
121
122    fn upgrade_inbound(self, socket: C, _: Self::Info) -> Self::Future {
123        let connection = Connection::new(socket, self.0, Mode::Client);
124        future::ready(Ok(Muxer::new(connection)))
125    }
126
127    fn upgrade_outbound(self, socket: C, _: Self::Info) -> Self::Future {
128        let connection = Connection::new(socket, self.0, Mode::Server);
129        future::ready(Ok(Muxer::new(connection)))
130    }
131}
airio_yamux/lib.rs

airio_yamux/
lib.rs
