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#![deny(warnings, rust_2018_idioms)]
#![feature(async_await)]
use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite};
use tokio_test::assert_ok;
use bytes::BytesMut;
use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};
#[tokio::test]
async fn copy() {
struct Rd(bool);
impl AsyncRead for Rd {
fn poll_read(
mut self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
if self.0 {
buf[0..11].copy_from_slice(b"hello world");
self.0 = false;
Poll::Ready(Ok(11))
} else {
Poll::Ready(Ok(0))
}
}
}
struct Wr(BytesMut);
impl Unpin for Wr {}
impl AsyncWrite for Wr {
fn poll_write(
mut self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<io::Result<usize>> {
self.0.extend(buf);
Ok(buf.len()).into()
}
fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
Ok(()).into()
}
fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
Ok(()).into()
}
}
let buf = BytesMut::with_capacity(64);
let mut rd = Rd(true);
let mut wr = Wr(buf);
let n = assert_ok!(rd.copy(&mut wr).await);
assert_eq!(n, 11);
assert_eq!(wr.0[..], b"hello world"[..]);
}
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