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async-tungstenite/examples/interval-server.rs

79 lines
2.6 KiB

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