1 #![warn(rust_2018_idioms)]
2 #![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery
3
4 use tokio::io::{
5 split, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, ReadBuf, ReadHalf, WriteHalf,
6 };
7
8 use std::io;
9 use std::pin::Pin;
10 use std::task::{Context, Poll};
11
12 struct RW;
13
14 impl AsyncRead for RW {
poll_read( self: Pin<&mut Self>, _cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll<io::Result<()>>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
25 impl AsyncWrite for RW {
poll_write( self: Pin<&mut Self>, _cx: &mut Context<'_>, _buf: &[u8], ) -> Poll<Result<usize, io::Error>>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
poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Result<(), io::Error>>34 fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
35 Poll::Ready(Ok(()))
36 }
37
poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Result<(), io::Error>>38 fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
39 Poll::Ready(Ok(()))
40 }
41
poll_write_vectored( self: Pin<&mut Self>, _cx: &mut Context<'_>, _bufs: &[io::IoSlice<'_>], ) -> Poll<Result<usize, io::Error>>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
is_write_vectored(&self) -> bool50 fn is_write_vectored(&self) -> bool {
51 true
52 }
53 }
54
55 #[test]
is_send_and_sync()56 fn 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]
split_stream_id()64 fn 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]
unsplit_ok()74 fn unsplit_ok() {
75 let (r, w) = split(RW);
76 r.unsplit(w);
77 }
78
79 #[test]
80 #[should_panic]
unsplit_err1()81 fn unsplit_err1() {
82 let (r, _) = split(RW);
83 let (_, w) = split(RW);
84 r.unsplit(w);
85 }
86
87 #[test]
88 #[should_panic]
unsplit_err2()89 fn unsplit_err2() {
90 let (_, w) = split(RW);
91 let (r, _) = split(RW);
92 r.unsplit(w);
93 }
94
95 #[test]
method_delegation()96 fn 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