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async-tungstenite/examples/server.rs

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//! A chat server that broadcasts a message to all connections.
//!
//! This is a simple line-based server which accepts WebSocket connections,
//! reads lines from those connections, and broadcasts the lines to all other
//! connected clients.
//!
//! You can test this out by running:
//!
//! cargo run --example server 127.0.0.1:12345
//!
//! And then in another window run:
//!
//! cargo run --example client ws://127.0.0.1:12345/
//!
//! You can run the second command in multiple windows and then chat between the
//! two, seeing the messages from the other client as they're received. For all
//! connected clients they'll all join the same room and see everyone else's
//! messages.
use std::env;
use std::io::Error;
use futures::channel::mpsc::{UnboundedReceiver, UnboundedSender};
use futures::StreamExt;
use log::*;
use async_std::task;
use async_std::net::{SocketAddr, ToSocketAddrs};
use async_std::net::{TcpListener, TcpStream};
use tungstenite::protocol::Message;
struct Connection {
addr: SocketAddr,
rx: UnboundedReceiver<Message>,
tx: UnboundedSender<Message>,
}
async fn handle_connection(connection: Connection) {
let mut connection = connection;
while let Some(msg) = connection.rx.next().await {
info!("Received a message from {}: {}", connection.addr, msg);
connection
.tx
.unbounded_send(msg)
.expect("Failed to forward message");
}
}
async fn accept_connection(stream: TcpStream) {
let addr = stream
.peer_addr()
.expect("connected streams should have a peer address");
info!("Peer address: {}", addr);
let mut ws_stream = async_tungstenite::accept_async(stream)
.await
.expect("Error during the websocket handshake occurred");
info!("New WebSocket connection: {}", addr);
// Create a channel for our stream, which other sockets will use to
// send us messages. Then register our address with the stream to send
// data to us.
let (msg_tx, msg_rx) = futures::channel::mpsc::unbounded();
let (response_tx, mut response_rx) = futures::channel::mpsc::unbounded();
let c = Connection {
addr: addr,
rx: msg_rx,
tx: response_tx,
};
task::spawn(handle_connection(c));
while let Some(message) = ws_stream.next().await {
let message = message.expect("Failed to get request");
msg_tx
.unbounded_send(message)
.expect("Failed to forward request");
if let Some(resp) = response_rx.next().await {
ws_stream.send(resp).await.expect("Failed to send response");
}
}
}
async fn run() -> Result<(), Error> {
let _ = env_logger::try_init();
let addr = env::args().nth(1).unwrap_or("127.0.0.1:8080".to_string());
let addr = addr
.to_socket_addrs()
.await
.expect("Not a valid address")
.next()
.expect("Not a socket address");
// Create the event loop and TCP listener we'll accept connections on.
let try_socket = TcpListener::bind(&addr).await;
let listener = try_socket.expect("Failed to bind");
info!("Listening on: {}", addr);
while let Ok((stream, _)) = listener.accept().await {
task::spawn(accept_connection(stream));
}
Ok(())
}
fn main() -> Result<(), Error> {
task::block_on(run())
}