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feat(webrtc): add three tuple watcher implementation #12

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47 changes: 47 additions & 0 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -418,6 +418,53 @@ impl<S: Watcher, T: Watcher> Watcher for (S, T) {
}
}

impl<S: Watcher, T: Watcher, U: Watcher> Watcher for (S, T, U) {
type Value = (S::Value, T::Value, U::Value);

fn get(&mut self) -> Self::Value {
(self.0.get(), self.1.get(), self.2.get())
}

fn is_connected(&self) -> bool {
self.0.is_connected() && self.1.is_connected() && self.2.is_connected()
}

fn poll_updated(
&mut self,
cx: &mut task::Context<'_>,
) -> Poll<Result<Self::Value, Disconnected>> {
let poll_0 = self.0.poll_updated(cx)?;
let poll_1 = self.1.poll_updated(cx)?;
let poll_2 = self.2.poll_updated(cx)?;

match (poll_0, poll_1, poll_2) {
// If all are ready
(Poll::Ready(s), Poll::Ready(t), Poll::Ready(u)) => Poll::Ready(Ok((s, t, u))),
// If any one is ready, get current values for the others
(Poll::Ready(s), Poll::Ready(t), Poll::Pending) => {
Poll::Ready(Ok((s, t, self.2.get())))
}
(Poll::Ready(s), Poll::Pending, Poll::Ready(u)) => {
Poll::Ready(Ok((s, self.1.get(), u)))
}
(Poll::Pending, Poll::Ready(t), Poll::Ready(u)) => {
Poll::Ready(Ok((self.0.get(), t, u)))
}
(Poll::Ready(s), Poll::Pending, Poll::Pending) => {
Poll::Ready(Ok((s, self.1.get(), self.2.get())))
}
(Poll::Pending, Poll::Ready(t), Poll::Pending) => {
Poll::Ready(Ok((self.0.get(), t, self.2.get())))
}
(Poll::Pending, Poll::Pending, Poll::Ready(u)) => {
Poll::Ready(Ok((self.0.get(), self.1.get(), u)))
}
// If none are ready
(Poll::Pending, Poll::Pending, Poll::Pending) => Poll::Pending,
}
}
}

/// Combinator to join two watchers
#[derive(Debug, Clone)]
pub struct Join<T: Clone + Eq, W: Watcher<Value = T>> {
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