56 lines
1.3 KiB
Rust
56 lines
1.3 KiB
Rust
use pin_project::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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/// Future that resolves to the response or failure to connect.
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#[pin_project]
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#[derive(Debug)]
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pub struct ResponseFuture<F, E> {
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#[pin]
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inner: Inner<F, E>,
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}
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#[pin_project(project = InnerProj)]
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#[derive(Debug)]
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enum Inner<F, E> {
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Future(#[pin] F),
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Error(Option<E>),
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}
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impl<F, E> ResponseFuture<F, E> {
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pub(crate) fn new(inner: F) -> Self {
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ResponseFuture {
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inner: Inner::Future(inner),
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}
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}
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pub(crate) fn error(error: E) -> Self {
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ResponseFuture {
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inner: Inner::Error(Some(error)),
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}
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}
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}
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impl<F, T, E, ME> Future for ResponseFuture<F, ME>
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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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ME: 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 me = self.project();
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match me.inner.project() {
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InnerProj::Future(fut) => fut.poll(cx).map_err(Into::into),
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InnerProj::Error(e) => {
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let e = e.take().expect("Polled after ready.").into();
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Poll::Ready(Err(e))
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}
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}
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}
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}
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