1 #![warn(rust_2018_idioms)]
2 #![cfg(all(feature = "full", not(target_os = "wasi"), not(miri)))] // Wasi doesn't support bind
3 // No socket on miri.
4
5 use tokio::io::{self, AsyncReadExt, AsyncWriteExt};
6 use tokio::net::{TcpListener, TcpStream};
7 use tokio::sync::oneshot;
8 use tokio_test::assert_ok;
9
10 #[tokio::test]
echo_server()11 async fn echo_server() {
12 const ITER: usize = 1024;
13
14 let (tx, rx) = oneshot::channel();
15
16 let srv = assert_ok!(TcpListener::bind("127.0.0.1:0").await);
17 let addr = assert_ok!(srv.local_addr());
18
19 let msg = "foo bar baz";
20 tokio::spawn(async move {
21 let mut stream = assert_ok!(TcpStream::connect(&addr).await);
22
23 for _ in 0..ITER {
24 // write
25 assert_ok!(stream.write_all(msg.as_bytes()).await);
26
27 // read
28 let mut buf = [0; 11];
29 assert_ok!(stream.read_exact(&mut buf).await);
30 assert_eq!(&buf[..], msg.as_bytes());
31 }
32
33 assert_ok!(tx.send(()));
34 });
35
36 let (mut stream, _) = assert_ok!(srv.accept().await);
37 let (mut rd, mut wr) = stream.split();
38
39 let n = assert_ok!(io::copy(&mut rd, &mut wr).await);
40 assert_eq!(n, (ITER * msg.len()) as u64);
41
42 assert_ok!(rx.await);
43 }
44