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|
//! Compatibility between the `tokio::io` and `futures-io` versions of the
//! `AsyncRead` and `AsyncWrite` traits.
use pin_project_lite::pin_project;
use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};
pin_project! {
/// A compatibility layer that allows conversion between the
/// `tokio::io` and `futures-io` `AsyncRead` and `AsyncWrite` traits.
#[derive(Copy, Clone, Debug)]
pub struct Compat<T> {
#[pin]
inner: T,
}
}
/// Extension trait that allows converting a type implementing
/// `futures_io::AsyncRead` to implement `tokio::io::AsyncRead`.
pub trait FuturesAsyncReadCompatExt: futures_io::AsyncRead {
/// Wraps `self` with a compatibility layer that implements
/// `tokio_io::AsyncWrite`.
fn compat(self) -> Compat<Self>
where
Self: Sized,
{
Compat::new(self)
}
}
impl<T: futures_io::AsyncRead> FuturesAsyncReadCompatExt for T {}
/// Extension trait that allows converting a type implementing
/// `futures_io::AsyncWrite` to implement `tokio::io::AsyncWrite`.
pub trait FuturesAsyncWriteCompatExt: futures_io::AsyncWrite {
/// Wraps `self` with a compatibility layer that implements
/// `tokio::io::AsyncWrite`.
fn compat_write(self) -> Compat<Self>
where
Self: Sized,
{
Compat::new(self)
}
}
impl<T: futures_io::AsyncWrite> FuturesAsyncWriteCompatExt for T {}
/// Extension trait that allows converting a type implementing
/// `tokio::io::AsyncRead` to implement `futures_io::AsyncRead`.
pub trait Tokio02AsyncReadCompatExt: tokio::io::AsyncRead {
/// Wraps `self` with a compatibility layer that implements
/// `futures_io::AsyncRead`.
fn compat(self) -> Compat<Self>
where
Self: Sized,
{
Compat::new(self)
}
}
impl<T: tokio::io::AsyncRead> Tokio02AsyncReadCompatExt for T {}
/// Extension trait that allows converting a type implementing
/// `tokio::io::AsyncWrite` to implement `futures_io::AsyncWrite`.
pub trait Tokio02AsyncWriteCompatExt: tokio::io::AsyncWrite {
/// Wraps `self` with a compatibility layer that implements
/// `futures_io::AsyncWrite`.
fn compat_write(self) -> Compat<Self>
where
Self: Sized,
{
Compat::new(self)
}
}
impl<T: tokio::io::AsyncWrite> Tokio02AsyncWriteCompatExt for T {}
// === impl Compat ===
impl<T> Compat<T> {
fn new(inner: T) -> Self {
Self { inner }
}
/// Get a reference to the `Future`, `Stream`, `AsyncRead`, or `AsyncWrite` object
/// contained within.
pub fn get_ref(&self) -> &T {
&self.inner
}
/// Get a mutable reference to the `Future`, `Stream`, `AsyncRead`, or `AsyncWrite` object
/// contained within.
pub fn get_mut(&mut self) -> &mut T {
&mut self.inner
}
/// Returns the wrapped item.
pub fn into_inner(self) -> T {
self.inner
}
}
impl<T> tokio::io::AsyncRead for Compat<T>
where
T: futures_io::AsyncRead,
{
fn poll_read(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
futures_io::AsyncRead::poll_read(self.project().inner, cx, buf)
}
}
impl<T> futures_io::AsyncRead for Compat<T>
where
T: tokio::io::AsyncRead,
{
fn poll_read(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
tokio::io::AsyncRead::poll_read(self.project().inner, cx, buf)
}
}
impl<T> tokio::io::AsyncBufRead for Compat<T>
where
T: futures_io::AsyncBufRead,
{
fn poll_fill_buf<'a>(
self: Pin<&'a mut Self>,
cx: &mut Context<'_>,
) -> Poll<io::Result<&'a [u8]>> {
futures_io::AsyncBufRead::poll_fill_buf(self.project().inner, cx)
}
fn consume(self: Pin<&mut Self>, amt: usize) {
futures_io::AsyncBufRead::consume(self.project().inner, amt)
}
}
impl<T> futures_io::AsyncBufRead for Compat<T>
where
T: tokio::io::AsyncBufRead,
{
fn poll_fill_buf<'a>(
self: Pin<&'a mut Self>,
cx: &mut Context<'_>,
) -> Poll<io::Result<&'a [u8]>> {
tokio::io::AsyncBufRead::poll_fill_buf(self.project().inner, cx)
}
fn consume(self: Pin<&mut Self>, amt: usize) {
tokio::io::AsyncBufRead::consume(self.project().inner, amt)
}
}
impl<T> tokio::io::AsyncWrite for Compat<T>
where
T: futures_io::AsyncWrite,
{
fn poll_write(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<io::Result<usize>> {
futures_io::AsyncWrite::poll_write(self.project().inner, cx, buf)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
futures_io::AsyncWrite::poll_flush(self.project().inner, cx)
}
fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
futures_io::AsyncWrite::poll_close(self.project().inner, cx)
}
}
impl<T> futures_io::AsyncWrite for Compat<T>
where
T: tokio::io::AsyncWrite,
{
fn poll_write(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<io::Result<usize>> {
tokio::io::AsyncWrite::poll_write(self.project().inner, cx, buf)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
tokio::io::AsyncWrite::poll_flush(self.project().inner, cx)
}
fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
tokio::io::AsyncWrite::poll_shutdown(self.project().inner, cx)
}
}
|
