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//! Join two values implementing `AsyncRead` and `AsyncWrite` into a single one.
use crate::io::{AsyncBufRead, AsyncRead, AsyncWrite, ReadBuf};
use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};
/// 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 }
}
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,
}
}
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)
}
/// Returns a reference to the inner reader.
pub fn reader(&self) -> &R {
&self.reader
}
/// Returns a reference to the inner writer.
pub fn writer(&self) -> &W {
&self.writer
}
/// Returns a mutable reference to the inner reader.
pub fn reader_mut(&mut self) -> &mut R {
&mut self.reader
}
/// Returns a mutable reference to the inner writer.
pub fn writer_mut(&mut self) -> &mut W {
&mut self.writer
}
/// Returns a pinned mutable reference to the inner reader.
pub fn reader_pin_mut(self: Pin<&mut Self>) -> Pin<&mut R> {
self.project().reader
}
/// Returns a pinned mutable reference to the inner writer.
pub fn writer_pin_mut(self: Pin<&mut Self>) -> Pin<&mut W> {
self.project().writer
}
}
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)
}
}
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)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
self.project().writer.poll_flush(cx)
}
fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
self.project().writer.poll_shutdown(cx)
}
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)
}
fn is_write_vectored(&self) -> bool {
self.writer.is_write_vectored()
}
}
impl<R, W> AsyncBufRead for Join<R, W>
where
R: AsyncBufRead,
{
fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<&[u8]>> {
self.project().reader.poll_fill_buf(cx)
}
fn consume(self: Pin<&mut Self>, amt: usize) {
self.project().reader.consume(amt)
}
}