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107 lines
3.3 KiB
107 lines
3.3 KiB
//! A chat server that broadcasts a message to all connections.
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//!
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//! This is a simple line-based server which accepts WebSocket connections,
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//! reads lines from those connections, and broadcasts the lines to all other
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//! connected clients.
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//!
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//! You can test this out by running:
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//!
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//! cargo run --example server 127.0.0.1:12345
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//!
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//! And then in another window run:
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//!
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//! cargo run --example client ws://127.0.0.1:12345/
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//!
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//! You can run the second command in multiple windows and then chat between the
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//! two, seeing the messages from the other client as they're received. For all
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//! connected clients they'll all join the same room and see everyone else's
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//! messages.
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use std::env;
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use std::io::Error;
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use async_std::net::{TcpListener, TcpStream};
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use async_std::task;
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use futures::channel::mpsc::UnboundedSender;
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use futures::stream::SplitStream;
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use futures::{SinkExt, StreamExt};
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use log::*;
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use std::collections::HashMap;
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use std::net::SocketAddr;
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use std::sync::{Arc, Mutex};
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use tungstenite::protocol::Message;
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type Tx = UnboundedSender<Message>;
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type WsRx = SplitStream<async_tungstenite::WebSocketStream<TcpStream>>;
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type PeerMap = Arc<Mutex<HashMap<SocketAddr, Tx>>>;
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async fn handle_message(addr: SocketAddr, peer_map: PeerMap, ws_rx: WsRx) {
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let mut ws_rx = ws_rx;
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while let Some(msg) = ws_rx.next().await {
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let msg = msg.expect("Failed to get response");
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info!(
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"Received a message from {}: {}",
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addr,
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msg.to_text().unwrap()
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);
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for peer in peer_map.lock().unwrap().iter_mut() {
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let _ = peer.1.unbounded_send(msg.clone());
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}
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}
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}
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async fn accept_connection(peer_map: PeerMap, raw_stream: TcpStream) {
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let addr = raw_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: {}", addr);
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let ws_stream = async_tungstenite::accept_async(raw_stream)
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.await
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.expect("Error during the websocket handshake occurred");
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info!("New WebSocket connection: {}", addr);
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let (mut ws_tx, ws_rx) = ws_stream.split();
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let (msg_tx, mut msg_rx) = futures::channel::mpsc::unbounded();
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//We want to be able to send data to a specific peer, use this tx.
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peer_map.lock().unwrap().insert(addr, msg_tx);
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//Handle incoming messages
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task::spawn(handle_message(addr, peer_map.clone(), ws_rx));
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//If msg_rx get's some data, send it on the websocket.
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while let Some(msg) = msg_rx.next().await {
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info!("Sending message to {}", addr);
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ws_tx.send(msg).await.expect("Failed to send request");
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}
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}
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async fn run() -> Result<(), Error> {
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let _ = env_logger::try_init();
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let addr = env::args()
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.nth(1)
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.unwrap_or_else(|| "127.0.0.1:8080".to_string());
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let hm: HashMap<SocketAddr, Tx> = HashMap::new();
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let state = PeerMap::new(Mutex::new(hm));
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// Create the event loop and TCP listener we'll accept connections on.
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let try_socket = TcpListener::bind(&addr).await;
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let listener = try_socket.expect("Failed to bind");
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info!("Listening on: {}", addr);
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while let Ok((stream, _)) = listener.accept().await {
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task::spawn(accept_connection(state.clone(), stream));
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}
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Ok(())
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}
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fn main() -> Result<(), Error> {
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task::block_on(run())
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}
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