airio_muxing/
lib.rs

1use airio_core::{StreamMuxer, Upgrade, UpgradeInfo, muxing::StreamMuxerEvent};
2use futures::{AsyncRead, AsyncWrite, future, ready};
3pub use muxing::{Connection, ConnectionError, Endpoint, Stream};
4use std::{
5    collections::VecDeque,
6    io, iter,
7    pin::Pin,
8    task::{Context, Poll, Waker},
9};
10
11#[derive(Debug)]
12pub struct Muxer<C> {
13    connection: Connection<C>,
14    inbound_stream_buffer: VecDeque<Stream>,
15    inbound_stream_waker: Option<Waker>,
16}
17
18impl<C> Muxer<C>
19where
20    C: AsyncRead + AsyncWrite + Unpin + 'static,
21{
22    pub fn new(connection: Connection<C>) -> Self {
23        Muxer {
24            connection,
25            inbound_stream_buffer: VecDeque::with_capacity(MAX_BUFFERED_INBOUND_STREAMS),
26            inbound_stream_waker: None,
27        }
28    }
29
30    fn poll_inner(&mut self, cx: &mut Context<'_>) -> Poll<Result<Stream, ConnectionError>> {
31        let stream =
32            ready!(self.connection.poll_next_inbound(cx)?).ok_or(ConnectionError::Closed)?;
33        Poll::Ready(Ok(stream))
34    }
35}
36
37const MAX_BUFFERED_INBOUND_STREAMS: usize = 256;
38
39impl<C> StreamMuxer for Muxer<C>
40where
41    C: AsyncRead + AsyncWrite + Unpin + 'static,
42{
43    type Substream = Stream;
44    type Error = ConnectionError;
45
46    fn poll_inbound(
47        mut self: Pin<&mut Self>,
48        cx: &mut Context<'_>,
49    ) -> Poll<Result<Self::Substream, Self::Error>> {
50        if let Some(stream) = self.inbound_stream_buffer.pop_front() {
51            return Poll::Ready(Ok(stream));
52        }
53        if let Poll::Ready(res) = self.poll_inner(cx) {
54            return Poll::Ready(res);
55        }
56        self.inbound_stream_waker = Some(cx.waker().clone());
57        Poll::Pending
58    }
59
60    fn poll_outbound(
61        mut self: Pin<&mut Self>,
62        cx: &mut Context<'_>,
63    ) -> Poll<Result<Self::Substream, Self::Error>> {
64        self.as_mut().connection.poll_new_outbound(cx)
65    }
66
67    #[tracing::instrument(level = "trace", name = "StreamMuxer::poll", skip(self, cx))]
68    fn poll(
69        mut self: Pin<&mut Self>,
70        cx: &mut Context<'_>,
71    ) -> Poll<Result<StreamMuxerEvent, Self::Error>> {
72        let mut this = self.as_mut();
73        let inbound_stream = ready!(this.poll_inner(cx))?;
74
75        if this.inbound_stream_buffer.len() >= MAX_BUFFERED_INBOUND_STREAMS {
76            tracing::warn!(
77                "{}: Inbound stream buffer is full, dropping stream:",
78                inbound_stream
79            );
80            drop(inbound_stream);
81        } else {
82            this.inbound_stream_buffer.push_back(inbound_stream);
83            if let Some(waker) = this.inbound_stream_waker.take() {
84                waker.wake();
85            }
86        }
87        // 马上唤醒任务
88        cx.waker().wake_by_ref();
89        Poll::Pending
90    }
91
92    #[tracing::instrument(level = "trace", name = "StreamMuxer::poll_close", skip(self, cx))]
93    fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
94        self.as_mut().connection.poll_close(cx)
95    }
96}
97
98#[derive(Debug, Clone)]
99pub struct Config(muxing::Config);
100
101impl Config {
102    pub fn new() -> Self {
103        Config(muxing::Config::default())
104    }
105
106    pub fn set_max_active_streams(&mut self, max_active_streams: usize) -> &mut Self {
107        self.0.set_max_active_streams(max_active_streams);
108        self
109    }
110
111    pub fn set_read_after_close(&mut self, read_after_close: bool) -> &mut Self {
112        self.0.set_read_after_close(read_after_close);
113        self
114    }
115}
116
117impl Default for Config {
118    fn default() -> Self {
119        Config(muxing::Config::default())
120    }
121}
122
123impl UpgradeInfo for Config {
124    type Info = &'static str;
125    type InfoIter = iter::Once<Self::Info>;
126
127    fn protocol_info(&self) -> Self::InfoIter {
128        iter::once("/v1/muxing")
129    }
130}
131
132impl<C> Upgrade<C> for Config
133where
134    C: AsyncRead + AsyncWrite + Send + Unpin + 'static,
135{
136    type Output = Muxer<C>;
137    type Error = io::Error;
138    type Future = future::Ready<Result<Self::Output, Self::Error>>;
139
140    fn upgrade_inbound(self, socket: C, _: Self::Info) -> Self::Future {
141        let connection = Connection::new(socket, self.0, Endpoint::Server);
142        future::ready(Ok(Muxer::new(connection)))
143    }
144
145    fn upgrade_outbound(self, socket: C, _: Self::Info) -> Self::Future {
146        let connection = Connection::new(socket, self.0, Endpoint::Client);
147        future::ready(Ok(Muxer::new(connection)))
148    }
149}
airio_muxing/lib.rs

airio_muxing/
lib.rs
