use std::io::IoSlice;
use std::pin::Pin;
use std::task::{Context, Poll};
use pin_project_lite::pin_project;
use tokio::io::{self, AsyncRead, AsyncWrite, ReadBuf};
pin_project! {
#[derive(Clone, Debug)]
pub struct Duplex<R, W> {
#[pin]
reader: R,
#[pin]
writer: W,
}
}
impl<R, W> Duplex<R, W> {
pub fn new(reader: R, writer: W) -> Self {
Self { reader, writer }
}
}
impl<R: AsyncRead, W> AsyncRead for Duplex<R, W> {
fn poll_read(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut ReadBuf<'_>,
) -> Poll<io::Result<()>> {
AsyncRead::poll_read(self.project().reader, cx, buf)
}
}
impl<R, W: AsyncWrite> AsyncWrite for Duplex<R, W> {
fn poll_write(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<io::Result<usize>> {
AsyncWrite::poll_write(self.project().writer, cx, buf)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
AsyncWrite::poll_flush(self.project().writer, cx)
}
fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
AsyncWrite::poll_shutdown(self.project().writer, cx)
}
fn poll_write_vectored(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
bufs: &[IoSlice<'_>],
) -> Poll<Result<usize, io::Error>> {
AsyncWrite::poll_write_vectored(self.project().writer, cx, bufs)
}
fn is_write_vectored(&self) -> bool {
AsyncWrite::is_write_vectored(&self.writer)
}
}