blob: f66811e03d2a5f09f1d28d67fe66414d6b462f27 [file] [log] [blame]
use {Poll, Async, Future};
use sink::Sink;
/// Future for the `Sink::flush` combinator, which polls the sink until all data
/// has been flushed.
#[derive(Debug)]
#[must_use = "futures do nothing unless polled"]
pub struct Flush<S> {
sink: Option<S>,
}
pub fn new<S: Sink>(sink: S) -> Flush<S> {
Flush { sink: Some(sink) }
}
impl<S: Sink> Flush<S> {
/// Get a shared reference to the inner sink.
pub fn get_ref(&self) -> &S {
self.sink.as_ref().expect("Attempted `Flush::get_ref` after the flush completed")
}
/// Get a mutable reference to the inner sink.
pub fn get_mut(&mut self) -> &mut S {
self.sink.as_mut().expect("Attempted `Flush::get_mut` after the flush completed")
}
/// Consume the `Flush` and return the inner sink.
pub fn into_inner(self) -> S {
self.sink.expect("Attempted `Flush::into_inner` after the flush completed")
}
}
impl<S: Sink> Future for Flush<S> {
type Item = S;
type Error = S::SinkError;
fn poll(&mut self) -> Poll<S, S::SinkError> {
let mut sink = self.sink.take().expect("Attempted to poll Flush after it completed");
if sink.poll_complete()?.is_ready() {
Ok(Async::Ready(sink))
} else {
self.sink = Some(sink);
Ok(Async::NotReady)
}
}
}