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//! I/O utility for bridging between `tokio::io` and `hyper::rt`.
use hyper::rt::{Read, ReadBufCursor, Write};
use std::io::Error;
use std::pin::Pin;
use std::task::{Context, Poll};
use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
/// A type that wraps any type implementing [`tokio::io::AsyncRead`] and [`tokio::io::AsyncWrite`]
/// and itself implements [`hyper::rt::Read`] and [`hyper::rt::Write`].
#[derive(Debug)]
pub struct TokioIo<T> {
inner: T,
}
impl<T> TokioIo<T> {
/// Create a new `TokioIo` wrapping the given inner type.
pub fn new(inner: T) -> TokioIo<T> {
TokioIo { inner }
}
}
impl<T: AsyncRead + Unpin> Read for TokioIo<T> {
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
mut buf: ReadBufCursor<'_>,
) -> Poll<Result<(), Error>> {
unsafe {
let mut dst = ReadBuf::uninit(buf.as_mut());
let res = Pin::new(&mut self.inner).poll_read(cx, &mut dst);
let amt = dst.filled().len();
buf.advance(amt);
res
}
}
}
impl<T: AsyncWrite + Unpin> Write for TokioIo<T> {
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<Result<usize, Error>> {
Pin::new(&mut self.inner).poll_write(cx, buf)
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Error>> {
Pin::new(&mut self.inner).poll_flush(cx)
}
fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Error>> {
Pin::new(&mut self.inner).poll_shutdown(cx)
}
}
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