#[macro_use]
extern crate futures;
use futures::{Poll, Future, Stream, Sink};
use futures::executor;
use futures::future::{ok, err};
use futures::stream::{iter, Peekable, BoxStream};
use futures::sync::oneshot;
use futures::sync::mpsc;
mod support;
use support::*;
fn list() -> BoxStream<i32, u32> {
let (tx, rx) = mpsc::channel(1);
tx.send(Ok(1))
.and_then(|tx| tx.send(Ok(2)))
.and_then(|tx| tx.send(Ok(3)))
.forget();
rx.then(|r| r.unwrap()).boxed()
}
fn err_list() -> BoxStream<i32, u32> {
let (tx, rx) = mpsc::channel(1);
tx.send(Ok(1))
.and_then(|tx| tx.send(Ok(2)))
.and_then(|tx| tx.send(Err(3)))
.forget();
rx.then(|r| r.unwrap()).boxed()
}
#[test]
fn map() {
assert_done(|| list().map(|a| a + 1).collect(), Ok(vec![2, 3, 4]));
}
#[test]
fn map_err() {
assert_done(|| err_list().map_err(|a| a + 1).collect(), Err(4));
}
#[test]
fn fold() {
assert_done(|| list().fold(0, |a, b| ok::<i32, u32>(a + b)), Ok(6));
assert_done(|| err_list().fold(0, |a, b| ok::<i32, u32>(a + b)), Err(3));
}
#[test]
fn filter() {
assert_done(|| list().filter(|a| *a % 2 == 0).collect(), Ok(vec![2]));
}
#[test]
fn filter_map() {
assert_done(|| list().filter_map(|x| {
if x % 2 == 0 {
Some(x + 10)
} else {
None
}
}).collect(), Ok(vec![12]));
}
#[test]
fn and_then() {
assert_done(|| list().and_then(|a| Ok(a + 1)).collect(), Ok(vec![2, 3, 4]));
assert_done(|| list().and_then(|a| err::<i32, u32>(a as u32)).collect(),
Err(1));
}
#[test]
fn then() {
assert_done(|| list().then(|a| a.map(|e| e + 1)).collect(), Ok(vec![2, 3, 4]));
}
#[test]
fn or_else() {
assert_done(|| err_list().or_else(|a| {
ok::<i32, u32>(a as i32)
}).collect(), Ok(vec![1, 2, 3]));
}
#[test]
fn flatten() {
assert_done(|| list().map(|_| list()).flatten().collect(),
Ok(vec![1, 2, 3, 1, 2, 3, 1, 2, 3]));
}
#[test]
fn skip() {
assert_done(|| list().skip(2).collect(), Ok(vec![3]));
}
#[test]
fn skip_passes_errors_through() {
let mut s = iter(vec![Err(1), Err(2), Ok(3), Ok(4), Ok(5)])
.skip(1)
.wait();
assert_eq!(s.next(), Some(Err(1)));
assert_eq!(s.next(), Some(Err(2)));
assert_eq!(s.next(), Some(Ok(4)));
assert_eq!(s.next(), Some(Ok(5)));
assert_eq!(s.next(), None);
}
#[test]
fn skip_while() {
assert_done(|| list().skip_while(|e| Ok(*e % 2 == 1)).collect(),
Ok(vec![2, 3]));
}
#[test]
fn take() {
assert_done(|| list().take(2).collect(), Ok(vec![1, 2]));
}
#[test]
fn take_while() {
assert_done(|| list().take_while(|e| Ok(*e < 3)).collect(),
Ok(vec![1, 2]));
}
#[test]
fn take_passes_errors_through() {
let mut s = iter(vec![Err(1), Err(2), Ok(3), Ok(4), Err(4)])
.take(1)
.wait();
assert_eq!(s.next(), Some(Err(1)));
assert_eq!(s.next(), Some(Err(2)));
assert_eq!(s.next(), Some(Ok(3)));
assert_eq!(s.next(), None);
let mut s = iter(vec![Ok(1), Err(2)]).take(1).wait();
assert_eq!(s.next(), Some(Ok(1)));
assert_eq!(s.next(), None);
}
#[test]
fn peekable() {
assert_done(|| list().peekable().collect(), Ok(vec![1, 2, 3]));
}
#[test]
fn fuse() {
let mut stream = list().fuse().wait();
assert_eq!(stream.next(), Some(Ok(1)));
assert_eq!(stream.next(), Some(Ok(2)));
assert_eq!(stream.next(), Some(Ok(3)));
assert_eq!(stream.next(), None);
assert_eq!(stream.next(), None);
assert_eq!(stream.next(), None);
}
#[test]
fn buffered() {
let (tx, rx) = mpsc::channel(1);
let (a, b) = oneshot::channel::<u32>();
let (c, d) = oneshot::channel::<u32>();
tx.send(b.map_err(|_| ()).boxed())
.and_then(|tx| tx.send(d.map_err(|_| ()).boxed()))
.forget();
let mut rx = rx.buffered(2);
sassert_empty(&mut rx);
c.send(3).unwrap();
sassert_empty(&mut rx);
a.send(5).unwrap();
let mut rx = rx.wait();
assert_eq!(rx.next(), Some(Ok(5)));
assert_eq!(rx.next(), Some(Ok(3)));
assert_eq!(rx.next(), None);
let (tx, rx) = mpsc::channel(1);
let (a, b) = oneshot::channel::<u32>();
let (c, d) = oneshot::channel::<u32>();
tx.send(b.map_err(|_| ()).boxed())
.and_then(|tx| tx.send(d.map_err(|_| ()).boxed()))
.forget();
let mut rx = rx.buffered(1);
sassert_empty(&mut rx);
c.send(3).unwrap();
sassert_empty(&mut rx);
a.send(5).unwrap();
let mut rx = rx.wait();
assert_eq!(rx.next(), Some(Ok(5)));
assert_eq!(rx.next(), Some(Ok(3)));
assert_eq!(rx.next(), None);
}
#[test]
fn unordered() {
let (tx, rx) = mpsc::channel(1);
let (a, b) = oneshot::channel::<u32>();
let (c, d) = oneshot::channel::<u32>();
tx.send(b.map_err(|_| ()).boxed())
.and_then(|tx| tx.send(d.map_err(|_| ()).boxed()))
.forget();
let mut rx = rx.buffer_unordered(2);
sassert_empty(&mut rx);
let mut rx = rx.wait();
c.send(3).unwrap();
assert_eq!(rx.next(), Some(Ok(3)));
a.send(5).unwrap();
assert_eq!(rx.next(), Some(Ok(5)));
assert_eq!(rx.next(), None);
let (tx, rx) = mpsc::channel(1);
let (a, b) = oneshot::channel::<u32>();
let (c, d) = oneshot::channel::<u32>();
tx.send(b.map_err(|_| ()).boxed())
.and_then(|tx| tx.send(d.map_err(|_| ()).boxed()))
.forget();
let mut rx = rx.buffer_unordered(1);
sassert_empty(&mut rx);
c.send(3).unwrap();
sassert_empty(&mut rx);
a.send(5).unwrap();
let mut rx = rx.wait();
assert_eq!(rx.next(), Some(Ok(5)));
assert_eq!(rx.next(), Some(Ok(3)));
assert_eq!(rx.next(), None);
}
#[test]
fn zip() {
assert_done(|| list().zip(list()).collect(),
Ok(vec![(1, 1), (2, 2), (3, 3)]));
assert_done(|| list().zip(list().take(2)).collect(),
Ok(vec![(1, 1), (2, 2)]));
assert_done(|| list().take(2).zip(list()).collect(),
Ok(vec![(1, 1), (2, 2)]));
assert_done(|| err_list().zip(list()).collect(), Err(3));
assert_done(|| list().zip(list().map(|x| x + 1)).collect(),
Ok(vec![(1, 2), (2, 3), (3, 4)]));
}
#[test]
fn peek() {
struct Peek {
inner: Peekable<BoxStream<i32, u32>>
}
impl Future for Peek {
type Item = ();
type Error = u32;
fn poll(&mut self) -> Poll<(), u32> {
{
let res = try_ready!(self.inner.peek());
assert_eq!(res, Some(&1));
}
assert_eq!(self.inner.peek().unwrap(), Some(&1).into());
assert_eq!(self.inner.poll().unwrap(), Some(1).into());
Ok(().into())
}
}
Peek {
inner: list().peekable(),
}.wait().unwrap()
}
#[test]
fn wait() {
assert_eq!(list().wait().collect::<Result<Vec<_>, _>>(),
Ok(vec![1, 2, 3]));
}
#[test]
fn chunks() {
assert_done(|| list().chunks(3).collect(), Ok(vec![vec![1, 2, 3]]));
assert_done(|| list().chunks(1).collect(), Ok(vec![vec![1], vec![2], vec![3]]));
assert_done(|| list().chunks(2).collect(), Ok(vec![vec![1, 2], vec![3]]));
let mut list = executor::spawn(err_list().chunks(3));
let i = list.wait_stream().unwrap().unwrap();
assert_eq!(i, vec![1, 2]);
let i = list.wait_stream().unwrap().unwrap_err();
assert_eq!(i, 3);
}
#[test]
#[should_panic]
fn chunks_panic_on_cap_zero() {
let _ = list().chunks(0);
}
#[test]
fn select() {
let a = iter(vec![Ok::<_, u32>(1), Ok(2), Ok(3)]);
let b = iter(vec![Ok(4), Ok(5), Ok(6)]);
assert_done(|| a.select(b).collect(), Ok(vec![1, 4, 2, 5, 3, 6]));
let a = iter(vec![Ok::<_, u32>(1), Ok(2), Ok(3)]);
let b = iter(vec![Ok(1), Ok(2)]);
assert_done(|| a.select(b).collect(), Ok(vec![1, 1, 2, 2, 3]));
let a = iter(vec![Ok(1), Ok(2)]);
let b = iter(vec![Ok::<_, u32>(1), Ok(2), Ok(3)]);
assert_done(|| a.select(b).collect(), Ok(vec![1, 1, 2, 2, 3]));
}
#[test]
fn forward() {
let v = Vec::new();
let v = iter(vec![Ok::<_, ()>(0), Ok(1)]).forward(v).wait().unwrap().1;
assert_eq!(v, vec![0, 1]);
let v = iter(vec![Ok::<_, ()>(2), Ok(3)]).forward(v).wait().unwrap().1;
assert_eq!(v, vec![0, 1, 2, 3]);
assert_done(move || iter(vec![Ok(4), Ok(5)]).forward(v).map(|(_, s)| s),
Ok::<_, ()>(vec![0, 1, 2, 3, 4, 5]));
}
#[test]
fn concat() {
let a = iter(vec![Ok::<_, ()>(vec![1, 2, 3]), Ok(vec![4, 5, 6]), Ok(vec![7, 8, 9])]);
assert_done(move || a.concat(), Ok(vec![1, 2, 3, 4, 5, 6, 7, 8, 9]));
let b = iter(vec![Ok::<_, ()>(vec![1, 2, 3]), Err(()), Ok(vec![7, 8, 9])]);
assert_done(move || b.concat(), Err(()));
}