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use crate::Stream;
use std::pin::Pin;
use std::task::{Context, Poll};
use tokio::sync::mpsc::UnboundedReceiver;
/// A wrapper around [`tokio::sync::mpsc::UnboundedReceiver`] that implements [`Stream`].
///
/// [`tokio::sync::mpsc::UnboundedReceiver`]: struct@tokio::sync::mpsc::UnboundedReceiver
/// [`Stream`]: trait@crate::Stream
#[derive(Debug)]
pub struct UnboundedReceiverStream<T> {
inner: UnboundedReceiver<T>,
}
impl<T> UnboundedReceiverStream<T> {
/// Create a new `UnboundedReceiverStream`.
pub fn new(recv: UnboundedReceiver<T>) -> Self {
Self { inner: recv }
}
/// Get back the inner `UnboundedReceiver`.
pub fn into_inner(self) -> UnboundedReceiver<T> {
self.inner
}
/// Closes the receiving half of a channel without dropping it.
///
/// This prevents any further messages from being sent on the channel while
/// still enabling the receiver to drain messages that are buffered.
pub fn close(&mut self) {
self.inner.close()
}
}
impl<T> Stream for UnboundedReceiverStream<T> {
type Item = T;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
self.inner.poll_recv(cx)
}
}
impl<T> AsRef<UnboundedReceiver<T>> for UnboundedReceiverStream<T> {
fn as_ref(&self) -> &UnboundedReceiver<T> {
&self.inner
}
}
impl<T> AsMut<UnboundedReceiver<T>> for UnboundedReceiverStream<T> {
fn as_mut(&mut self) -> &mut UnboundedReceiver<T> {
&mut self.inner
}
}
impl<T> From<UnboundedReceiver<T>> for UnboundedReceiverStream<T> {
fn from(recv: UnboundedReceiver<T>) -> Self {
Self::new(recv)
}
}