54 lines
1.2 KiB
Rust
54 lines
1.2 KiB
Rust
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//! Future types
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use super::error::Elapsed;
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use pin_project_lite::pin_project;
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use std::{
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future::Future,
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pin::Pin,
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task::{Context, Poll},
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};
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use tokio::time::Sleep;
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pin_project! {
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/// [`Timeout`] response future
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///
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/// [`Timeout`]: crate::timeout::Timeout
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#[derive(Debug)]
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pub struct ResponseFuture<T> {
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#[pin]
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response: T,
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#[pin]
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sleep: Sleep,
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}
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}
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impl<T> ResponseFuture<T> {
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pub(crate) fn new(response: T, sleep: Sleep) -> Self {
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ResponseFuture { response, sleep }
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}
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}
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impl<F, T, E> Future for ResponseFuture<F>
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where
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F: Future<Output = Result<T, E>>,
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E: Into<crate::BoxError>,
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{
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type Output = Result<T, crate::BoxError>;
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fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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let this = self.project();
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// First, try polling the future
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match this.response.poll(cx) {
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Poll::Ready(v) => return Poll::Ready(v.map_err(Into::into)),
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Poll::Pending => {}
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}
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// Now check the sleep
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match this.sleep.poll(cx) {
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Poll::Pending => Poll::Pending,
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Poll::Ready(_) => Poll::Ready(Err(Elapsed(()).into())),
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}
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}
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}
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