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use crate::stream::{Fuse, Stream};
use crate::time::{error::Elapsed, Instant, Sleep};
use core::future::Future;
use core::pin::Pin;
use core::task::{Context, Poll};
use pin_project_lite::pin_project;
use std::time::Duration;
pin_project! {
/// Stream returned by the [`timeout`](super::StreamExt::timeout) method.
#[must_use = "streams do nothing unless polled"]
#[derive(Debug)]
pub struct Timeout<S> {
#[pin]
stream: Fuse<S>,
deadline: Sleep,
duration: Duration,
poll_deadline: bool,
}
}
impl<S: Stream> Timeout<S> {
pub(super) fn new(stream: S, duration: Duration) -> Self {
let next = Instant::now() + duration;
let deadline = Sleep::new_timeout(next);
Timeout {
stream: Fuse::new(stream),
deadline,
duration,
poll_deadline: true,
}
}
}
impl<S: Stream> Stream for Timeout<S> {
type Item = Result<S::Item, Elapsed>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
match self.as_mut().project().stream.poll_next(cx) {
Poll::Ready(v) => {
if v.is_some() {
let next = Instant::now() + self.duration;
self.as_mut().project().deadline.reset(next);
*self.as_mut().project().poll_deadline = true;
}
return Poll::Ready(v.map(Ok));
}
Poll::Pending => {}
};
if self.poll_deadline {
ready!(Pin::new(self.as_mut().project().deadline).poll(cx));
*self.as_mut().project().poll_deadline = false;
return Poll::Ready(Some(Err(Elapsed::new())));
}
Poll::Pending
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.stream.size_hint()
}
}
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