1#![warn(rust_2018_idioms)]
2#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind()
3
4use tokio::net::TcpListener;
5use tokio_test::assert_ok;
6
7use std::io::prelude::*;
8use std::net::TcpStream;
9use std::thread;
10
11#[tokio::test]
12async fn echo_server() {
13 const N: usize = 1024;
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
20 let t = thread::spawn(move || {
21 let mut s = assert_ok!(TcpStream::connect(addr));
22
23 let t2 = thread::spawn(move || {
24 let mut s = assert_ok!(TcpStream::connect(addr));
25 let mut b = vec![0; msg.len() * N];
26 assert_ok!(s.read_exact(&mut b));
27 b
28 });
29
30 let mut expected = Vec::<u8>::new();
31 for _i in 0..N {
32 expected.extend(msg.as_bytes());
33 let res = assert_ok!(s.write(msg.as_bytes()));
34 assert_eq!(res, msg.len());
35 }
36
37 (expected, t2)
38 });
39
40 let (mut a, _) = assert_ok!(srv.accept().await);
41 let (mut b, _) = assert_ok!(srv.accept().await);
42
43 let n = assert_ok!(tokio::io::copy(&mut a, &mut b).await);
44
45 let (expected, t2) = t.join().unwrap();
46 let actual = t2.join().unwrap();
47
48 assert!(expected == actual);
49 assert_eq!(n, msg.len() as u64 * 1024);
50}
51