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use futures_io::AsyncWrite;
use futures_sink::Sink;
use std::{
io::{self, IoSlice},
pin::Pin,
task::{Context, Poll},
};
#[pin_project::pin_project]
#[derive(Debug)]
pub struct TrackClosed<T> {
#[pin]
inner: T,
closed: bool,
}
impl<T> TrackClosed<T> {
pub(crate) fn new(inner: T) -> Self {
Self { inner, closed: false }
}
pub fn is_closed(&self) -> bool {
self.closed
}
pub fn get_ref(&self) -> &T {
&self.inner
}
pub fn get_mut(&mut self) -> &mut T {
&mut self.inner
}
pub fn get_pin_mut(self: Pin<&mut Self>) -> Pin<&mut T> {
self.project().inner
}
pub fn into_inner(self) -> T {
self.inner
}
}
impl<T: AsyncWrite> AsyncWrite for TrackClosed<T> {
fn poll_write(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<io::Result<usize>> {
if self.is_closed() {
return Poll::Ready(Err(io::Error::new(
io::ErrorKind::Other,
"Attempted to write after stream was closed",
)));
}
self.project().inner.poll_write(cx, buf)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
if self.is_closed() {
return Poll::Ready(Err(io::Error::new(
io::ErrorKind::Other,
"Attempted to flush after stream was closed",
)));
}
assert!(!self.is_closed());
self.project().inner.poll_flush(cx)
}
fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
if self.is_closed() {
return Poll::Ready(Err(io::Error::new(
io::ErrorKind::Other,
"Attempted to close after stream was closed",
)));
}
let this = self.project();
match this.inner.poll_close(cx) {
Poll::Ready(Ok(())) => {
*this.closed = true;
Poll::Ready(Ok(()))
}
other => other,
}
}
fn poll_write_vectored(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
bufs: &[IoSlice<'_>],
) -> Poll<io::Result<usize>> {
if self.is_closed() {
return Poll::Ready(Err(io::Error::new(
io::ErrorKind::Other,
"Attempted to write after stream was closed",
)));
}
self.project().inner.poll_write_vectored(cx, bufs)
}
}
impl<Item, T: Sink<Item>> Sink<Item> for TrackClosed<T> {
type Error = T::Error;
fn poll_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
assert!(!self.is_closed());
self.project().inner.poll_ready(cx)
}
fn start_send(self: Pin<&mut Self>, item: Item) -> Result<(), Self::Error> {
assert!(!self.is_closed());
self.project().inner.start_send(item)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
assert!(!self.is_closed());
self.project().inner.poll_flush(cx)
}
fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
assert!(!self.is_closed());
let this = self.project();
match this.inner.poll_close(cx) {
Poll::Ready(Ok(())) => {
*this.closed = true;
Poll::Ready(Ok(()))
}
other => other,
}
}
}