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use futures::{Poll, Stream};
use {StreamExt, TakeUntil, Trigger, Tripwire};
#[derive(Clone, Debug)]
pub struct Valve(Tripwire);
impl Valve {
pub fn new() -> (Trigger, Self) {
let (t, tw) = Tripwire::new();
(t, Valve(tw))
}
pub fn wrap<S>(&self, stream: S) -> Valved<S>
where
S: Stream,
{
Valved(stream.take_until(self.0.clone()))
}
}
#[derive(Clone, Debug)]
pub struct Valved<S>(TakeUntil<S, Tripwire>);
impl<S> Valved<S> {
pub fn new(stream: S) -> (Trigger, Self)
where
S: Stream,
{
let (vh, v) = Valve::new();
(vh, v.wrap(stream))
}
}
impl<S> Stream for Valved<S>
where
S: Stream,
{
type Item = S::Item;
type Error = S::Error;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
self.0.poll()
}
}
#[cfg(test)]
mod tests {
use super::*;
use futures::stream::empty;
#[test]
fn valved_stream_may_be_dropped_safely() {
let _orphan = {
let s = empty::<(), ()>();
let (trigger, valve) = Valve::new();
let _wrapped = valve.wrap(s);
trigger
};
}
}