80 lines
2.6 KiB
Rust
80 lines
2.6 KiB
Rust
use async_std::net::{TcpListener, TcpStream};
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use async_std::task;
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use async_tungstenite::{
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accept_async,
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tungstenite::{Error, Message, Result},
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};
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use futures::future::{select, Either};
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use futures::prelude::*;
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use log::*;
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use std::net::SocketAddr;
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use std::time::Duration;
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async fn accept_connection(peer: SocketAddr, stream: TcpStream) {
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if let Err(e) = handle_connection(peer, stream).await {
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match e {
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Error::ConnectionClosed | Error::Protocol(_) | Error::Utf8 => (),
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err => error!("Error processing connection: {}", err),
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}
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}
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}
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async fn handle_connection(peer: SocketAddr, stream: TcpStream) -> Result<()> {
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let ws_stream = accept_async(stream).await.expect("Failed to accept");
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info!("New WebSocket connection: {}", peer);
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let (mut ws_sender, mut ws_receiver) = ws_stream.split();
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let mut interval = async_std::stream::interval(Duration::from_millis(1000));
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// Echo incoming WebSocket messages and send a message periodically every second.
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let mut msg_fut = ws_receiver.next();
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let mut tick_fut = interval.next();
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loop {
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match select(msg_fut, tick_fut).await {
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Either::Left((msg, tick_fut_continue)) => {
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match msg {
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Some(msg) => {
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let msg = msg?;
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if msg.is_text() || msg.is_binary() {
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ws_sender.send(msg).await?;
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} else if msg.is_close() {
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break;
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}
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tick_fut = tick_fut_continue; // Continue waiting for tick.
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msg_fut = ws_receiver.next(); // Receive next WebSocket message.
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}
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None => break, // WebSocket stream terminated.
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};
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}
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Either::Right((_, msg_fut_continue)) => {
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ws_sender.send(Message::Text("tick".to_owned())).await?;
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msg_fut = msg_fut_continue; // Continue receiving the WebSocket message.
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tick_fut = interval.next(); // Wait for next tick.
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}
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}
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}
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Ok(())
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}
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async fn run() {
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env_logger::init();
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let addr = "127.0.0.1:9002";
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let listener = TcpListener::bind(&addr).await.expect("Can't listen");
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info!("Listening on: {}", addr);
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while let Ok((stream, _)) = listener.accept().await {
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let peer = stream
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.peer_addr()
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.expect("connected streams should have a peer address");
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info!("Peer address: {}", peer);
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task::spawn(accept_connection(peer, stream));
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}
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}
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fn main() {
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task::block_on(run());
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}
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