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use futures::channel::oneshot::{self, Canceled};
use futures::executor::block_on;
use futures::future;
use std::sync::mpsc::{channel, TryRecvError};
// mod support;
// use support::*;
fn unselect<T, E, A, B>(r: Result<Either<(T, B), (T, A)>, Either<(E, B), (E, A)>>) -> Result<T, E> {
match r {
Ok(Either::Left((t, _))) | Ok(Either::Right((t, _))) => Ok(t),
Err(Either::Left((e, _))) | Err(Either::Right((e, _))) => Err(e),
}
}
#[test]
fn result_smoke() {
fn is_future_v<A, B, C>(_: C)
where
A: Send + 'static,
B: Send + 'static,
C: Future<Item = A, Error = B>,
{
}
is_future_v::<i32, u32, _>(f_ok(1).map(|a| a + 1));
is_future_v::<i32, u32, _>(f_ok(1).map_err(|a| a + 1));
is_future_v::<i32, u32, _>(f_ok(1).and_then(Ok));
is_future_v::<i32, u32, _>(f_ok(1).or_else(Err));
is_future_v::<(i32, i32), u32, _>(f_ok(1).join(Err(3)));
is_future_v::<i32, u32, _>(f_ok(1).map(f_ok).flatten());
assert_done(|| f_ok(1), r_ok(1));
assert_done(|| f_err(1), r_err(1));
assert_done(|| result(Ok(1)), r_ok(1));
assert_done(|| result(Err(1)), r_err(1));
assert_done(|| ok(1), r_ok(1));
assert_done(|| err(1), r_err(1));
assert_done(|| f_ok(1).map(|a| a + 2), r_ok(3));
assert_done(|| f_err(1).map(|a| a + 2), r_err(1));
assert_done(|| f_ok(1).map_err(|a| a + 2), r_ok(1));
assert_done(|| f_err(1).map_err(|a| a + 2), r_err(3));
assert_done(|| f_ok(1).and_then(|a| Ok(a + 2)), r_ok(3));
assert_done(|| f_err(1).and_then(|a| Ok(a + 2)), r_err(1));
assert_done(|| f_ok(1).and_then(|a| Err(a as u32 + 3)), r_err(4));
assert_done(|| f_err(1).and_then(|a| Err(a as u32 + 4)), r_err(1));
assert_done(|| f_ok(1).or_else(|a| Ok(a as i32 + 2)), r_ok(1));
assert_done(|| f_err(1).or_else(|a| Ok(a as i32 + 2)), r_ok(3));
assert_done(|| f_ok(1).or_else(|a| Err(a + 3)), r_ok(1));
assert_done(|| f_err(1).or_else(|a| Err(a + 4)), r_err(5));
assert_done(|| f_ok(1).select(f_err(2)).then(unselect), r_ok(1));
assert_done(|| f_ok(1).select(Ok(2)).then(unselect), r_ok(1));
assert_done(|| f_err(1).select(f_ok(1)).then(unselect), r_err(1));
assert_done(|| f_ok(1).select(empty()).then(unselect), Ok(1));
assert_done(|| empty().select(f_ok(1)).then(unselect), Ok(1));
assert_done(|| f_ok(1).join(f_err(1)), Err(1));
assert_done(|| f_ok(1).join(Ok(2)), Ok((1, 2)));
assert_done(|| f_err(1).join(f_ok(1)), Err(1));
assert_done(|| f_ok(1).then(|_| Ok(2)), r_ok(2));
assert_done(|| f_ok(1).then(|_| Err(2)), r_err(2));
assert_done(|| f_err(1).then(|_| Ok(2)), r_ok(2));
assert_done(|| f_err(1).then(|_| Err(2)), r_err(2));
}
#[test]
fn test_empty() {
fn empty() -> Empty<i32, u32> {
future::empty()
}
assert_empty(|| empty());
assert_empty(|| empty().select(empty()));
assert_empty(|| empty().join(empty()));
assert_empty(|| empty().join(f_ok(1)));
assert_empty(|| f_ok(1).join(empty()));
assert_empty(|| empty().or_else(move |_| empty()));
assert_empty(|| empty().and_then(move |_| empty()));
assert_empty(|| f_err(1).or_else(move |_| empty()));
assert_empty(|| f_ok(1).and_then(move |_| empty()));
assert_empty(|| empty().map(|a| a + 1));
assert_empty(|| empty().map_err(|a| a + 1));
assert_empty(|| empty().then(|a| a));
}
#[test]
fn test_ok() {
assert_done(|| ok(1), r_ok(1));
assert_done(|| err(1), r_err(1));
}
#[test]
fn flatten() {
fn ok<T: Send + 'static>(a: T) -> FutureResult<T, u32> {
future::ok(a)
}
fn err<E: Send + 'static>(b: E) -> FutureResult<i32, E> {
future::err(b)
}
assert_done(|| ok(ok(1)).flatten(), r_ok(1));
assert_done(|| ok(err(1)).flatten(), r_err(1));
assert_done(|| err(1u32).map(ok).flatten(), r_err(1));
assert_done(|| future::ok(future::ok(1)).flatten(), r_ok(1));
assert_empty(|| ok(empty::<i32, u32>()).flatten());
assert_empty(|| empty::<i32, u32>().map(ok).flatten());
}
#[test]
fn smoke_oneshot() {
assert_done(
|| {
let (c, p) = oneshot::channel();
c.send(1).unwrap();
p
},
Ok(1),
);
assert_done(
|| {
let (c, p) = oneshot::channel::<i32>();
drop(c);
p
},
Err(Canceled),
);
let mut completes = Vec::new();
assert_empty(|| {
let (a, b) = oneshot::channel::<i32>();
completes.push(a);
b
});
let (c, mut p) = oneshot::channel::<i32>();
drop(c);
let res = panic_waker_lw(|lw| p.poll(lw));
assert!(res.is_err());
let (c, p) = oneshot::channel::<i32>();
drop(c);
let (tx, rx) = channel();
p.then(move |_| tx.send(())).forget();
rx.recv().unwrap();
}
#[test]
fn select_cancels() {
let ((a, b), (c, d)) = (oneshot::channel::<i32>(), oneshot::channel::<i32>());
let ((btx, brx), (dtx, drx)) = (channel(), channel());
let b = b.map(move |b| {
btx.send(b).unwrap();
b
});
let d = d.map(move |d| {
dtx.send(d).unwrap();
d
});
let mut f = b.select(d).then(unselect);
// assert!(f.poll(&mut Task::new()).is_pending());
assert!(brx.try_recv().is_err());
assert!(drx.try_recv().is_err());
a.send(1).unwrap();
noop_waker_lw(|lw| {
let res = f.poll(lw);
assert!(res.ok().unwrap().is_ready());
assert_eq!(brx.recv().unwrap(), 1);
drop(c);
assert!(drx.recv().is_err());
let ((a, b), (c, d)) = (oneshot::channel::<i32>(), oneshot::channel::<i32>());
let ((btx, _brx), (dtx, drx)) = (channel(), channel());
let b = b.map(move |b| {
btx.send(b).unwrap();
b
});
let d = d.map(move |d| {
dtx.send(d).unwrap();
d
});
let mut f = b.select(d).then(unselect);
assert!(f.poll(lw).ok().unwrap().is_pending());
assert!(f.poll(lw).ok().unwrap().is_pending());
a.send(1).unwrap();
assert!(f.poll(lw).ok().unwrap().is_ready());
drop((c, f));
assert!(drx.recv().is_err());
})
}
#[test]
fn join_cancels() {
let ((a, b), (c, d)) = (oneshot::channel::<i32>(), oneshot::channel::<i32>());
let ((btx, _brx), (dtx, drx)) = (channel(), channel());
let b = b.map(move |b| {
btx.send(b).unwrap();
b
});
let d = d.map(move |d| {
dtx.send(d).unwrap();
d
});
let mut f = b.join(d);
drop(a);
let res = panic_waker_lw(|lw| f.poll(lw));
assert!(res.is_err());
drop(c);
assert!(drx.recv().is_err());
let ((a, b), (c, d)) = (oneshot::channel::<i32>(), oneshot::channel::<i32>());
let ((btx, _brx), (dtx, drx)) = (channel(), channel());
let b = b.map(move |b| {
btx.send(b).unwrap();
b
});
let d = d.map(move |d| {
dtx.send(d).unwrap();
d
});
let (tx, rx) = channel();
let f = b.join(d);
f.then(move |_| {
tx.send(()).unwrap();
let res: Result<(), ()> = Ok(());
res
})
.forget();
assert!(rx.try_recv().is_err());
drop(a);
rx.recv().unwrap();
drop(c);
assert!(drx.recv().is_err());
}
#[test]
fn join_incomplete() {
let (a, b) = oneshot::channel::<i32>();
let (tx, rx) = channel();
noop_waker_lw(|lw| {
let mut f = ok(1).join(b).map(move |r| tx.send(r).unwrap());
assert!(f.poll(lw).ok().unwrap().is_pending());
assert!(rx.try_recv().is_err());
a.send(2).unwrap();
assert!(f.poll(lw).ok().unwrap().is_ready());
assert_eq!(rx.recv().unwrap(), (1, 2));
let (a, b) = oneshot::channel::<i32>();
let (tx, rx) = channel();
let mut f = b.join(Ok(2)).map(move |r| tx.send(r).unwrap());
assert!(f.poll(lw).ok().unwrap().is_pending());
assert!(rx.try_recv().is_err());
a.send(1).unwrap();
assert!(f.poll(lw).ok().unwrap().is_ready());
assert_eq!(rx.recv().unwrap(), (1, 2));
let (a, b) = oneshot::channel::<i32>();
let (tx, rx) = channel();
let mut f = ok(1).join(b).map_err(move |_r| tx.send(2).unwrap());
assert!(f.poll(lw).ok().unwrap().is_pending());
assert!(rx.try_recv().is_err());
drop(a);
assert!(f.poll(lw).is_err());
assert_eq!(rx.recv().unwrap(), 2);
let (a, b) = oneshot::channel::<i32>();
let (tx, rx) = channel();
let mut f = b.join(Ok(2)).map_err(move |_r| tx.send(1).unwrap());
assert!(f.poll(lw).ok().unwrap().is_pending());
assert!(rx.try_recv().is_err());
drop(a);
assert!(f.poll(lw).is_err());
assert_eq!(rx.recv().unwrap(), 1);
})
}
#[test]
fn select2() {
assert_done(|| f_ok(2).select(empty()).then(unselect), Ok(2));
assert_done(|| empty().select(f_ok(2)).then(unselect), Ok(2));
assert_done(|| f_err(2).select(empty()).then(unselect), Err(2));
assert_done(|| empty().select(f_err(2)).then(unselect), Err(2));
assert_done(
|| {
f_ok(1).select(f_ok(2)).map_err(|_| 0).and_then(|either_tup| {
let (a, b) = either_tup.into_inner();
b.map(move |b| a + b)
})
},
Ok(3),
);
// Finish one half of a select and then fail the second, ensuring that we
// get the notification of the second one.
{
let ((a, b), (c, d)) = (oneshot::channel::<i32>(), oneshot::channel::<i32>());
let f = b.select(d);
let (tx, rx) = channel();
f.map(move |r| tx.send(r).unwrap()).forget();
a.send(1).unwrap();
let (val, next) = rx.recv().unwrap().into_inner();
assert_eq!(val, 1);
let (tx, rx) = channel();
next.map_err(move |_r| tx.send(2).unwrap()).forget();
assert_eq!(rx.try_recv().err().unwrap(), TryRecvError::Empty);
drop(c);
assert_eq!(rx.recv().unwrap(), 2);
}
// Fail the second half and ensure that we see the first one finish
{
let ((a, b), (c, d)) = (oneshot::channel::<i32>(), oneshot::channel::<i32>());
let f = b.select(d);
let (tx, rx) = channel();
f.map_err(move |r| tx.send((1, r.into_inner().1)).unwrap()).forget();
drop(c);
let (val, next) = rx.recv().unwrap();
assert_eq!(val, 1);
let (tx, rx) = channel();
next.map(move |r| tx.send(r).unwrap()).forget();
assert_eq!(rx.try_recv().err().unwrap(), TryRecvError::Empty);
a.send(2).unwrap();
assert_eq!(rx.recv().unwrap(), 2);
}
// Cancelling the first half should cancel the second
{
let ((_a, b), (_c, d)) = (oneshot::channel::<i32>(), oneshot::channel::<i32>());
let ((btx, brx), (dtx, drx)) = (channel(), channel());
let b = b.map(move |v| {
btx.send(v).unwrap();
v
});
let d = d.map(move |v| {
dtx.send(v).unwrap();
v
});
let f = b.select(d);
drop(f);
assert!(drx.recv().is_err());
assert!(brx.recv().is_err());
}
// Cancel after a schedule
{
let ((_a, b), (_c, d)) = (oneshot::channel::<i32>(), oneshot::channel::<i32>());
let ((btx, brx), (dtx, drx)) = (channel(), channel());
let b = b.map(move |v| {
btx.send(v).unwrap();
v
});
let d = d.map(move |v| {
dtx.send(v).unwrap();
v
});
let mut f = b.select(d);
let _res = noop_waker_lw(|lw| f.poll(lw));
drop(f);
assert!(drx.recv().is_err());
assert!(brx.recv().is_err());
}
// Cancel propagates
{
let ((a, b), (_c, d)) = (oneshot::channel::<i32>(), oneshot::channel::<i32>());
let ((btx, brx), (dtx, drx)) = (channel(), channel());
let b = b.map(move |v| {
btx.send(v).unwrap();
v
});
let d = d.map(move |v| {
dtx.send(v).unwrap();
v
});
let (tx, rx) = channel();
b.select(d).map(move |_| tx.send(()).unwrap()).forget();
drop(a);
assert!(drx.recv().is_err());
assert!(brx.recv().is_err());
assert!(rx.recv().is_err());
}
// Cancel on early drop
{
let (tx, rx) = channel();
let f = f_ok(1).select(empty::<_, ()>().map(move |()| {
tx.send(()).unwrap();
1
}));
drop(f);
assert!(rx.recv().is_err());
}
}
#[test]
fn option() {
assert_eq!(Ok(Some(())), block_on(Some(ok::<(), ()>(())).into_future()));
assert_eq!(Ok::<_, ()>(None::<()>), block_on(None::<FutureResult<(), ()>>.into_future()));
}