1 #![warn(rust_2018_idioms)]
2 #![cfg(feature = "full")]
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]
echo_server()12 async 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