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use core::pin::Pin;
use futures_core::stream::Stream;
use futures_core::task::{Context, Poll};
use futures_sink::{Sink};
use pin_utils::{unsafe_pinned, unsafe_unpinned};
#[derive(Debug)]
#[must_use = "sinks do nothing unless polled"]
pub struct SinkMapErr<Si, F> {
sink: Si,
f: Option<F>,
}
impl<Si: Unpin, F> Unpin for SinkMapErr<Si, F> {}
impl<Si, F> SinkMapErr<Si, F> {
unsafe_pinned!(sink: Si);
unsafe_unpinned!(f: Option<F>);
pub(super) fn new(sink: Si, f: F) -> SinkMapErr<Si, F> {
SinkMapErr { sink, f: Some(f) }
}
pub fn get_ref(&self) -> &Si {
&self.sink
}
pub fn get_mut(&mut self) -> &mut Si {
&mut self.sink
}
#[allow(clippy::needless_lifetimes)]
pub fn get_pin_mut<'a>(self: Pin<&'a mut Self>) -> Pin<&'a mut Si> {
unsafe { Pin::map_unchecked_mut(self, |x| &mut x.sink) }
}
pub fn into_inner(self) -> Si {
self.sink
}
fn take_f(self: Pin<&mut Self>) -> F {
self.f().take().expect("polled MapErr after completion")
}
}
impl<Si, F, E, Item> Sink<Item> for SinkMapErr<Si, F>
where Si: Sink<Item>,
F: FnOnce(Si::SinkError) -> E,
{
type SinkError = E;
fn poll_ready(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), Self::SinkError>> {
#[allow(clippy::redundant_closure)]
self.as_mut().sink().poll_ready(cx).map_err(|e| self.as_mut().take_f()(e))
}
fn start_send(
mut self: Pin<&mut Self>,
item: Item,
) -> Result<(), Self::SinkError> {
#[allow(clippy::redundant_closure)]
self.as_mut().sink().start_send(item).map_err(|e| self.as_mut().take_f()(e))
}
fn poll_flush(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), Self::SinkError>> {
#[allow(clippy::redundant_closure)]
self.as_mut().sink().poll_flush(cx).map_err(|e| self.as_mut().take_f()(e))
}
fn poll_close(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), Self::SinkError>> {
#[allow(clippy::redundant_closure)]
self.as_mut().sink().poll_close(cx).map_err(|e| self.as_mut().take_f()(e))
}
}
impl<S: Stream, F> Stream for SinkMapErr<S, F> {
type Item = S::Item;
fn poll_next(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<S::Item>> {
self.sink().poll_next(cx)
}
}