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//! A simple echo server.
//!
//! You can test this out by running:
//!
//! cargo run --features="async-std-runtime" --example echo-server 127.0.0.1:12345
//!
//! And then in another window run:
//!
//! cargo run --features="async-std-runtime" --example client ws://127.0.0.1:12345/
use std::{env, io::Error};
use async_std::net::{TcpListener, TcpStream};
use async_std::task;
use futures::prelude::*;
use log::info;
async fn run() -> Result<(), Error> {
let _ = env_logger::try_init();
let addr = env::args()
.nth(1)
.unwrap_or_else(|| "127.0.0.1:8080".to_string());
// 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(())
}
async fn accept_connection(stream: TcpStream) {
let addr = stream
.peer_addr()
.expect("connected streams should have a peer address");
info!("Peer address: {}", addr);
let ws_stream = async_tungstenite::accept_async(stream)
.await
.expect("Error during the websocket handshake occurred");
info!("New WebSocket connection: {}", addr);
let (write, read) = ws_stream.split();
// We should not forward messages other than text or binary.
read.try_filter(|msg| future::ready(msg.is_text() || msg.is_binary()))
.forward(write)
.await
.expect("Failed to forward messages")
}
fn main() -> Result<(), Error> {
task::block_on(run())
}
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