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//! Join two values implementing `AsyncRead` and `AsyncWrite` into a single one. | ||
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use crate::io::{AsyncRead, AsyncWrite, ReadBuf}; | ||
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use std::io; | ||
use std::pin::Pin; | ||
use std::task::{Context, Poll}; | ||
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/// Join two values implementing `AsyncRead` and `AsyncWrite` into a | ||
/// single handle. | ||
pub fn join<R, W>(reader: R, writer: W) -> Join<R, W> | ||
where | ||
R: AsyncRead, | ||
W: AsyncWrite, | ||
{ | ||
Join { reader, writer } | ||
} | ||
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pin_project_lite::pin_project! { | ||
/// Joins two values implementing `AsyncRead` and `AsyncWrite` into a | ||
/// single handle. | ||
#[derive(Debug)] | ||
pub struct Join<R, W> { | ||
#[pin] | ||
reader: R, | ||
#[pin] | ||
writer: W, | ||
} | ||
} | ||
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impl<R, W> Join<R, W> | ||
where | ||
R: AsyncRead, | ||
W: AsyncWrite, | ||
{ | ||
/// Splits this `Join` back into its `AsyncRead` and `AsyncWrite` | ||
/// components. | ||
pub fn into_inner(self) -> (R, W) { | ||
(self.reader, self.writer) | ||
} | ||
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/// Returns a reference to the inner reader. | ||
pub fn reader(&self) -> &R { | ||
&self.reader | ||
} | ||
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/// Returns a reference to the inner writer. | ||
pub fn writer(&self) -> &W { | ||
&self.writer | ||
} | ||
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/// Returns a mutable reference to the inner reader. | ||
pub fn reader_mut(&mut self) -> &mut R { | ||
&mut self.reader | ||
} | ||
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/// Returns a mutable reference to the inner writer. | ||
pub fn writer_mut(&mut self) -> &mut W { | ||
&mut self.writer | ||
} | ||
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/// Returns a pinned mutable reference to the inner reader. | ||
pub fn reader_pin_mut(self: Pin<&mut Self>) -> Pin<&mut R> { | ||
self.project().reader | ||
} | ||
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/// Returns a pinned mutable reference to the inner writer. | ||
pub fn writer_pin_mut(self: Pin<&mut Self>) -> Pin<&mut W> { | ||
self.project().writer | ||
} | ||
} | ||
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impl<R, W> AsyncRead for Join<R, W> | ||
where | ||
R: AsyncRead, | ||
{ | ||
fn poll_read( | ||
self: Pin<&mut Self>, | ||
cx: &mut Context<'_>, | ||
buf: &mut ReadBuf<'_>, | ||
) -> Poll<Result<(), io::Error>> { | ||
self.project().reader.poll_read(cx, buf) | ||
} | ||
} | ||
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impl<R, W> AsyncWrite for Join<R, W> | ||
where | ||
W: AsyncWrite, | ||
{ | ||
fn poll_write( | ||
self: Pin<&mut Self>, | ||
cx: &mut Context<'_>, | ||
buf: &[u8], | ||
) -> Poll<Result<usize, io::Error>> { | ||
self.project().writer.poll_write(cx, buf) | ||
} | ||
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fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> { | ||
self.project().writer.poll_flush(cx) | ||
} | ||
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fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> { | ||
self.project().writer.poll_shutdown(cx) | ||
} | ||
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fn poll_write_vectored( | ||
self: Pin<&mut Self>, | ||
cx: &mut Context<'_>, | ||
bufs: &[io::IoSlice<'_>], | ||
) -> Poll<Result<usize, io::Error>> { | ||
self.project().writer.poll_write_vectored(cx, bufs) | ||
} | ||
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fn is_write_vectored(&self) -> bool { | ||
self.writer.is_write_vectored() | ||
} | ||
} |
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#![warn(rust_2018_idioms)] | ||
#![cfg(feature = "full")] | ||
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use tokio::io::{join, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, Join, ReadBuf}; | ||
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use std::io; | ||
use std::pin::Pin; | ||
use std::task::{Context, Poll}; | ||
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struct R; | ||
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impl AsyncRead for R { | ||
fn poll_read( | ||
self: Pin<&mut Self>, | ||
_cx: &mut Context<'_>, | ||
buf: &mut ReadBuf<'_>, | ||
) -> Poll<io::Result<()>> { | ||
buf.put_slice(&[b'z']); | ||
Poll::Ready(Ok(())) | ||
} | ||
} | ||
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struct W; | ||
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impl AsyncWrite for W { | ||
fn poll_write( | ||
self: Pin<&mut Self>, | ||
_cx: &mut Context<'_>, | ||
_buf: &[u8], | ||
) -> Poll<Result<usize, io::Error>> { | ||
Poll::Ready(Ok(1)) | ||
} | ||
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fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> { | ||
Poll::Ready(Ok(())) | ||
} | ||
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fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> { | ||
Poll::Ready(Ok(())) | ||
} | ||
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fn poll_write_vectored( | ||
self: Pin<&mut Self>, | ||
_cx: &mut Context<'_>, | ||
_bufs: &[io::IoSlice<'_>], | ||
) -> Poll<Result<usize, io::Error>> { | ||
Poll::Ready(Ok(2)) | ||
} | ||
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fn is_write_vectored(&self) -> bool { | ||
true | ||
} | ||
} | ||
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#[test] | ||
fn is_send_and_sync() { | ||
fn assert_bound<T: Send + Sync>() {} | ||
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assert_bound::<Join<W, R>>(); | ||
} | ||
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#[test] | ||
fn method_delegation() { | ||
let mut rw = join(R, W); | ||
let mut buf = [0; 1]; | ||
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tokio_test::block_on(async move { | ||
assert_eq!(1, rw.read(&mut buf).await.unwrap()); | ||
assert_eq!(b'z', buf[0]); | ||
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assert_eq!(1, rw.write(&[b'x']).await.unwrap()); | ||
assert_eq!( | ||
2, | ||
rw.write_vectored(&[io::IoSlice::new(&[b'x'])]) | ||
.await | ||
.unwrap() | ||
); | ||
assert!(rw.is_write_vectored()); | ||
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assert!(rw.flush().await.is_ok()); | ||
assert!(rw.shutdown().await.is_ok()); | ||
}); | ||
} |