1 #![warn(rust_2018_idioms)]
2 #![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind()
3 
4 use tokio::net::TcpListener;
5 use tokio_test::assert_ok;
6 
7 use std::io::prelude::*;
8 use std::net::TcpStream;
9 use std::thread;
10 
11 #[tokio::test]
12 #[cfg_attr(miri, ignore)] // No `socket` on miri.
echo_server()13 async fn echo_server() {
14     const N: usize = 1024;
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 
21     let t = thread::spawn(move || {
22         let mut s = assert_ok!(TcpStream::connect(addr));
23 
24         let t2 = thread::spawn(move || {
25             let mut s = assert_ok!(TcpStream::connect(addr));
26             let mut b = vec![0; msg.len() * N];
27             assert_ok!(s.read_exact(&mut b));
28             b
29         });
30 
31         let mut expected = Vec::<u8>::new();
32         for _i in 0..N {
33             expected.extend(msg.as_bytes());
34             let res = assert_ok!(s.write(msg.as_bytes()));
35             assert_eq!(res, msg.len());
36         }
37 
38         (expected, t2)
39     });
40 
41     let (mut a, _) = assert_ok!(srv.accept().await);
42     let (mut b, _) = assert_ok!(srv.accept().await);
43 
44     let n = assert_ok!(tokio::io::copy(&mut a, &mut b).await);
45 
46     let (expected, t2) = t.join().unwrap();
47     let actual = t2.join().unwrap();
48 
49     assert!(expected == actual);
50     assert_eq!(n, msg.len() as u64 * 1024);
51 }
52