113 lines
2.8 KiB
Rust
113 lines
2.8 KiB
Rust
use std::pin::Pin;
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use std::sync::{Arc, Mutex};
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use std::task::{Context, Poll};
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use futures::{
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channel::mpsc::{channel as mpsc_channel, Receiver, Sender},
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Stream,
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};
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use crate::chunk::Chunk;
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/// A collection of listeners to a stream of WebM chunks.
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/// Sending a chunk may fail due to a client being disconnected,
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/// or simply failing to keep up with the stream buffer. In either
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/// case, there's nothing practical the server can do to recover,
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/// so the failing client is just dropped from the listener list.
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pub struct Channel {
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pub name: String,
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header_chunk: Option<Chunk>,
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listeners: Vec<Sender<Chunk>>,
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}
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pub type Handle = Arc<Mutex<Channel>>;
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impl Channel {
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pub fn new(name: String) -> Handle {
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info!("Opening Channel {}", name);
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Arc::new(Mutex::new(Channel {
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name,
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header_chunk: None,
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listeners: Vec::new(),
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}))
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}
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}
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impl Drop for Channel {
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fn drop(&mut self) {
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info!("Closing Channel {}", self.name);
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}
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}
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pub struct Transmitter {
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channel: Handle,
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}
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impl Transmitter {
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pub fn new(channel_arc: Handle) -> Self {
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Transmitter {
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channel: channel_arc,
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}
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}
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pub fn send(&self, chunk: Chunk) {
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let mut channel = self.channel.lock().expect("Locking channel");
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if let Chunk::Headers { .. } = chunk {
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channel.header_chunk = Some(chunk.clone());
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}
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channel
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.listeners
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.retain_mut(|listener| listener.start_send(chunk.clone()).is_ok());
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}
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}
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impl Drop for Transmitter {
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fn drop(&mut self) {
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if let Ok(mut channel) = self.channel.lock() {
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// when disconnecting, clean up the header chunk so subsequent
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// clients don't get a potentially incorrect initialization segment
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channel.header_chunk = None;
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}
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}
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}
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pub struct Listener {
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/// not used in operation, but its refcount keeps the channel alive when there's no Transmitter
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_channel: Handle,
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receiver: Receiver<Chunk>,
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}
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impl Listener {
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pub fn new(channel_arc: Handle) -> Self {
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let (mut sender, receiver) = mpsc_channel(5);
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{
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let mut channel = channel_arc.lock().expect("Locking channel");
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if let Some(ref chunk) = channel.header_chunk {
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sender
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.start_send(chunk.clone())
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.expect("Queuing existing header chunk");
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}
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channel.listeners.push(sender);
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}
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Listener {
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_channel: channel_arc,
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receiver: receiver,
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}
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}
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}
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impl Stream for Listener {
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type Item = Chunk;
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fn poll_next(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Chunk>> {
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let receiver = &mut self.get_mut().receiver;
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Pin::new(receiver).poll_next(cx)
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}
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}
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