54 lines
1.6 KiB
Rust
54 lines
1.6 KiB
Rust
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//! A simple echo server.
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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 echo-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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//! Type a message into the client window, press enter to send it and
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//! see it echoed back.
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use std::{env, io::Error};
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use futures_util::{future, StreamExt, TryStreamExt};
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use log::info;
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use tokio::net::{TcpListener, TcpStream};
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#[tokio::main]
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async fn main() -> Result<(), Error> {
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let _ = env_logger::try_init();
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let addr = env::args().nth(1).unwrap_or_else(|| "127.0.0.1:8080".to_string());
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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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tokio::spawn(accept_connection(stream));
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}
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Ok(())
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}
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async fn accept_connection(stream: TcpStream) {
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let addr = stream.peer_addr().expect("connected streams should have a peer address");
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info!("Peer address: {}", addr);
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let ws_stream = tokio_tungstenite::accept_async(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 (write, read) = ws_stream.split();
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// We should not forward messages other than text or binary.
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read.try_filter(|msg| future::ready(msg.is_text() || msg.is_binary()))
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.forward(write)
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.await
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.expect("Failed to forward messages")
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}
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