1#![warn(rust_2018_idioms)]
2#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery
3
4use tokio::io::{
5 split, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, ReadBuf, ReadHalf, WriteHalf,
6};
7
8use std::io;
9use std::pin::Pin;
10use std::task::{Context, Poll};
11
12struct RW;
13
14impl AsyncRead for RW {
15 fn poll_read(
16 self: Pin<&mut Self>,
17 _cx: &mut Context<'_>,
18 buf: &mut ReadBuf<'_>,
19 ) -> Poll<io::Result<()>> {
20 buf.put_slice(&[b'z']);
21 Poll::Ready(Ok(()))
22 }
23}
24
25impl AsyncWrite for RW {
26 fn poll_write(
27 self: Pin<&mut Self>,
28 _cx: &mut Context<'_>,
29 _buf: &[u8],
30 ) -> Poll<Result<usize, io::Error>> {
31 Poll::Ready(Ok(1))
32 }
33
34 fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
35 Poll::Ready(Ok(()))
36 }
37
38 fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
39 Poll::Ready(Ok(()))
40 }
41
42 fn poll_write_vectored(
43 self: Pin<&mut Self>,
44 _cx: &mut Context<'_>,
45 _bufs: &[io::IoSlice<'_>],
46 ) -> Poll<Result<usize, io::Error>> {
47 Poll::Ready(Ok(2))
48 }
49
50 fn is_write_vectored(&self) -> bool {
51 true
52 }
53}
54
55#[test]
56fn is_send_and_sync() {
57 fn assert_bound<T: Send + Sync>() {}
58
59 assert_bound::<ReadHalf<RW>>();
60 assert_bound::<WriteHalf<RW>>();
61}
62
63#[test]
64fn split_stream_id() {
65 let (r1, w1) = split(RW);
66 let (r2, w2) = split(RW);
67 assert!(r1.is_pair_of(&w1));
68 assert!(!r1.is_pair_of(&w2));
69 assert!(r2.is_pair_of(&w2));
70 assert!(!r2.is_pair_of(&w1));
71}
72
73#[test]
74fn unsplit_ok() {
75 let (r, w) = split(RW);
76 r.unsplit(w);
77}
78
79#[test]
80#[should_panic]
81fn unsplit_err1() {
82 let (r, _) = split(RW);
83 let (_, w) = split(RW);
84 r.unsplit(w);
85}
86
87#[test]
88#[should_panic]
89fn unsplit_err2() {
90 let (_, w) = split(RW);
91 let (r, _) = split(RW);
92 r.unsplit(w);
93}
94
95#[test]
96fn method_delegation() {
97 let (mut r, mut w) = split(RW);
98 let mut buf = [0; 1];
99
100 tokio_test::block_on(async move {
101 assert_eq!(1, r.read(&mut buf).await.unwrap());
102 assert_eq!(b'z', buf[0]);
103
104 assert_eq!(1, w.write(&[b'x']).await.unwrap());
105 assert_eq!(
106 2,
107 w.write_vectored(&[io::IoSlice::new(&[b'x'])])
108 .await
109 .unwrap()
110 );
111 assert!(w.is_write_vectored());
112
113 assert!(w.flush().await.is_ok());
114 assert!(w.shutdown().await.is_ok());
115 });
116}
117