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333 lines
9.2 KiB
333 lines
9.2 KiB
use std::net::SocketAddr;
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use anyhow::Context;
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use futures::stream::{SplitSink, SplitStream};
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use futures::{SinkExt, StreamExt};
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use tokio::net::{TcpListener, TcpStream};
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use tokio::sync::mpsc;
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use tokio_tungstenite::tungstenite::{
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Error as WebSocketError, Message as WebSocketMessage,
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};
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use tokio_tungstenite::WebSocketStream;
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use crate::control::request::*;
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use crate::control::response::*;
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use crate::dispatcher::Message;
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async fn forward_incoming(
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mut incoming: SplitStream<WebSocketStream<TcpStream>>,
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message_tx: &mpsc::UnboundedSender<Message>,
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) -> anyhow::Result<()> {
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while let Some(result) = incoming.next().await {
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if let Err(WebSocketError::ConnectionClosed) = result {
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break;
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}
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let message = result.context("reading control message")?;
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let text = message.to_text().context("non-text control message")?;
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let control_request: Request = serde_json::from_str(&text)
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.with_context(|| format!("decoding JSON message {:?}", text))?;
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message_tx.send(Message::ControlRequest(control_request));
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}
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Ok(())
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}
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async fn forward_outgoing(
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response_rx: &mut mpsc::Receiver<Response>,
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outgoing: &mut SplitSink<WebSocketStream<TcpStream>, WebSocketMessage>,
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) -> anyhow::Result<()> {
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while let Some(response) = response_rx.recv().await {
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let text =
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serde_json::to_string(&response).context("encoding control response")?;
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outgoing
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.send(WebSocketMessage::Text(text))
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.await
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.context("sending control response")?;
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}
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Ok(())
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}
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async fn handle(
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stream: WebSocketStream<TcpStream>,
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remote_address: &SocketAddr,
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message_tx: &mpsc::UnboundedSender<Message>,
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response_rx: &mut mpsc::Receiver<Response>,
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) {
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let (mut outgoing, incoming) = stream.split();
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tokio::select! {
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result = forward_incoming(incoming, message_tx) => match result {
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Ok(()) => info!(
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"Incoming websocket handler task for {} stopped",
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remote_address,
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),
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Err(err) => error!(
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"Error in websocket handler task for {}: {:#}",
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remote_address, err,
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),
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},
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result = forward_outgoing(response_rx, &mut outgoing) => match result {
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Ok(()) => info!(
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"Outgoing websocket handler for {} stopped",
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remote_address,
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),
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Err(err) => warn!(
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"Error in outgoing websocket handler for {}: {:#}",
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remote_address, err,
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),
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},
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};
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match outgoing.close().await {
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Ok(()) => info!("Closed websocket for {}", remote_address),
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Err(err) => {
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error!("Error closing websocket for {}: {}", remote_address, err,)
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}
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};
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}
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/// A listener for control connections.
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pub struct Listener {
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inner: TcpListener,
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address: SocketAddr,
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}
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impl Listener {
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pub async fn bind(address_str: &str) -> anyhow::Result<Self> {
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let inner = TcpListener::bind(address_str)
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.await
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.context("binding listener")?;
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let address = inner.local_addr().context("accessing local address")?;
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info!("Listening for control connections on {}", address);
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Ok(Self { inner, address })
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}
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pub fn address(&self) -> &SocketAddr {
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&self.address
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}
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/// Starts accepting control connections, one at a time. For each connection,
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/// forwards incoming messages from the socket to `message_tx` and outgoing
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/// responses from `response_rx` to the socket.
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pub async fn run(
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&mut self,
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message_tx: mpsc::UnboundedSender<Message>,
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mut response_rx: mpsc::Receiver<Response>,
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) -> anyhow::Result<()> {
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loop {
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let (raw_stream, remote_address) = tokio::select! {
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result = self.inner.accept() => {
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result.context("accepting connection")?
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},
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option = response_rx.recv() => match option {
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Some(response) => {
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debug!("Dropping control response in absence of connection: {:?}", response);
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continue
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},
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None => {
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info!("Stopping control listener: response channel closed");
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break
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},
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},
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};
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info!("Accepted control connection from {}", remote_address);
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// TODO: Continue iterating in case of error.
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let ws_stream = tokio_tungstenite::accept_async(raw_stream).await?;
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info!("WebSocket connection established from {}", remote_address);
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handle(ws_stream, &remote_address, &message_tx, &mut response_rx).await
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}
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::Listener;
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use std::net::SocketAddr;
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use anyhow::Context;
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use futures::{SinkExt, StreamExt};
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use tokio::sync::mpsc;
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use tokio_tungstenite::connect_async;
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use tokio_tungstenite::tungstenite::Message as WebSocketMessage;
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use crate::control::{Request, Response, RoomLeaveResponse};
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use crate::dispatcher::Message;
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struct Channels {
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message_tx: mpsc::UnboundedSender<Message>,
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message_rx: mpsc::UnboundedReceiver<Message>,
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response_tx: mpsc::Sender<Response>,
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response_rx: mpsc::Receiver<Response>,
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}
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impl Default for Channels {
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fn default() -> Self {
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let (message_tx, message_rx) = mpsc::unbounded_channel();
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let (response_tx, response_rx) = mpsc::channel(100);
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Self {
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message_tx,
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message_rx,
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response_tx,
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response_rx,
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}
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}
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}
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// Enable capturing logs in tests.
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fn init() {
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let _ = env_logger::builder().is_test(true).try_init();
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}
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#[tokio::test]
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async fn binds_to_localhost() -> anyhow::Result<()> {
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init();
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let listener = Listener::bind("localhost:0")
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.await
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.context("binding listener")?;
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match listener.address() {
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SocketAddr::V4(address) => assert!(address.ip().is_loopback()),
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SocketAddr::V6(address) => assert!(address.ip().is_loopback()),
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};
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Ok(())
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}
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#[tokio::test]
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async fn listens_for_websocket_connections() -> anyhow::Result<()> {
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init();
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let mut listener = Listener::bind("localhost:0")
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.await
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.context("binding listener")?;
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let address = format!("ws://{}", listener.address());
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let channels = Channels::default();
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// Move individual fields out of `channels`, for capture by `tokio::spawn`.
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let message_tx = channels.message_tx;
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let response_rx = channels.response_rx;
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let listener_task =
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tokio::spawn(async move { listener.run(message_tx, response_rx).await });
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let (_ws_stream, _response) = connect_async(address).await?;
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// Dropping this sender signals to the listener that it should stop.
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drop(channels.response_tx);
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let () = listener_task
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.await
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.context("joining listener task")?
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.context("running listener")?;
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Ok(())
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}
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#[tokio::test]
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async fn forwards_incoming_requests() -> anyhow::Result<()> {
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init();
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let mut listener = Listener::bind("localhost:0")
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.await
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.context("binding listener")?;
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let address = format!("ws://{}", listener.address());
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let mut channels = Channels::default();
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// Move individual fields out of `channels`, for capture by `tokio::spawn`.
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let message_tx = channels.message_tx;
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let response_rx = channels.response_rx;
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let listener_task =
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tokio::spawn(async move { listener.run(message_tx, response_rx).await });
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let (mut ws_stream, _response) = connect_async(address).await?;
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let request = serde_json::to_string(&Request::RoomListRequest)
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.context("serializing request")?;
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ws_stream.send(WebSocketMessage::Text(request)).await?;
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assert_eq!(
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channels.message_rx.recv().await,
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Some(Message::ControlRequest(Request::RoomListRequest))
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);
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// Dropping this sender signals to the listener that it should stop.
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drop(channels.response_tx);
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let () = listener_task
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.await
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.context("joining listener task")?
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.context("running listener")?;
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Ok(())
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}
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#[tokio::test]
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async fn forwards_outgoing_responses() -> anyhow::Result<()> {
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init();
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let mut listener = Listener::bind("localhost:0")
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.await
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.context("binding listener")?;
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let address = format!("ws://{}", listener.address());
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let channels = Channels::default();
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// Move individual fields out of `channels`, for capture by `tokio::spawn`.
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let message_tx = channels.message_tx;
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let response_rx = channels.response_rx;
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let listener_task =
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tokio::spawn(async move { listener.run(message_tx, response_rx).await });
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let (mut ws_stream, _response) = connect_async(address).await?;
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channels
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.response_tx
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.send(Response::RoomLeaveResponse(RoomLeaveResponse {
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room_name: "bleep".to_string(),
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}))
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.await
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.context("sending response")?;
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let message = ws_stream
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.next()
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.await
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.context("unwrapping next response from stream")?
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.context("read result")?;
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let text = message.to_text().context("non-text control message")?;
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let response: Response = serde_json::from_str(&text)
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.with_context(|| format!("decoding JSON message {:?}", text))?;
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assert_eq!(
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response,
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Response::RoomLeaveResponse(RoomLeaveResponse {
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room_name: "bleep".to_string(),
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})
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);
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// Dropping this sender signals to the listener that it should stop.
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drop(channels.response_tx);
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let () = listener_task
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.await
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.context("joining listener task")?
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.context("running listener")?;
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Ok(())
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}
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}
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