1#![warn(rust_2018_idioms)]
2#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind
3
4use tokio::io::{self, AsyncReadExt, AsyncWriteExt};
5use tokio::net::{TcpListener, TcpStream};
6use tokio::sync::oneshot;
7use tokio_test::assert_ok;
8
9#[tokio::test]
10async fn echo_server() {
11 const ITER: usize = 1024;
12
13 let (tx, rx) = oneshot::channel();
14
15 let srv = assert_ok!(TcpListener::bind("127.0.0.1:0").await);
16 let addr = assert_ok!(srv.local_addr());
17
18 let msg = "foo bar baz";
19 tokio::spawn(async move {
20 let mut stream = assert_ok!(TcpStream::connect(&addr).await);
21
22 for _ in 0..ITER {
23 // write
24 assert_ok!(stream.write_all(msg.as_bytes()).await);
25
26 // read
27 let mut buf = [0; 11];
28 assert_ok!(stream.read_exact(&mut buf).await);
29 assert_eq!(&buf[..], msg.as_bytes());
30 }
31
32 assert_ok!(tx.send(()));
33 });
34
35 let (mut stream, _) = assert_ok!(srv.accept().await);
36 let (mut rd, mut wr) = stream.split();
37
38 let n = assert_ok!(io::copy(&mut rd, &mut wr).await);
39 assert_eq!(n, (ITER * msg.len()) as u64);
40
41 assert_ok!(rx.await);
42}
43