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use futures::Sink;
use std::future::Future;
use std::task::{self, Poll};
use std::pin::Pin;
/// Future for the `SinkExt::send_async` combinator, which sends a value to a
/// sink and then waits until the sink has fully flushed.
#[derive(Debug)]
pub struct Send<'a, T: Sink + 'a + ?Sized> {
sink: &'a mut T,
item: Option<T::SinkItem>,
}
impl<T: Sink + Unpin + ?Sized> Unpin for Send<'_, T> {}
impl<'a, T: Sink + Unpin + ?Sized> Send<'a, T> {
pub(super) fn new(sink: &'a mut T, item: T::SinkItem) -> Self {
Send {
sink,
item: Some(item),
}
}
}
impl<T: Sink + Unpin + ?Sized> Future for Send<'_, T> {
type Output = Result<(), T::SinkError>;
fn poll(mut self: Pin<&mut Self>, _context: &mut task::Context) -> Poll<Self::Output> {
use crate::compat::forward::convert_poll;
use futures::AsyncSink::{NotReady, Ready};
if let Some(item) = self.item.take() {
match self.sink.start_send(item) {
Ok(Ready) => {}
Ok(NotReady(val)) => {
self.item = Some(val);
return Poll::Pending;
}
Err(err) => {
return Poll::Ready(Err(err));
}
}
}
// we're done sending the item, but want to block on flushing the
// sink
try_ready!(convert_poll(self.sink.poll_complete()));
Poll::Ready(Ok(()))
}
}
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