Jason Macnak | 09c3688 | 2020-04-01 16:22:56 +0000 | [diff] [blame] | 1 | use futures::channel::oneshot::{self, Sender}; |
| 2 | use futures::executor::block_on; |
Haibo Huang | 0cf3d2c | 2020-05-08 19:24:52 -0700 | [diff] [blame^] | 3 | use futures::future::{FutureExt, poll_fn}; |
Jason Macnak | 09c3688 | 2020-04-01 16:22:56 +0000 | [diff] [blame] | 4 | use futures::task::{Context, Poll}; |
| 5 | use futures_test::task::panic_waker_ref; |
Jason Macnak | 09c3688 | 2020-04-01 16:22:56 +0000 | [diff] [blame] | 6 | use std::sync::mpsc; |
| 7 | use std::thread; |
| 8 | |
| 9 | #[test] |
| 10 | fn smoke_poll() { |
| 11 | let (mut tx, rx) = oneshot::channel::<u32>(); |
| 12 | let mut rx = Some(rx); |
| 13 | let f = poll_fn(|cx| { |
| 14 | assert!(tx.poll_canceled(cx).is_pending()); |
| 15 | assert!(tx.poll_canceled(cx).is_pending()); |
| 16 | drop(rx.take()); |
| 17 | assert!(tx.poll_canceled(cx).is_ready()); |
| 18 | assert!(tx.poll_canceled(cx).is_ready()); |
| 19 | Poll::Ready(()) |
| 20 | }); |
| 21 | |
| 22 | block_on(f); |
| 23 | } |
| 24 | |
| 25 | #[test] |
| 26 | fn cancel_notifies() { |
Haibo Huang | 0cf3d2c | 2020-05-08 19:24:52 -0700 | [diff] [blame^] | 27 | let (mut tx, rx) = oneshot::channel::<u32>(); |
Jason Macnak | 09c3688 | 2020-04-01 16:22:56 +0000 | [diff] [blame] | 28 | |
Haibo Huang | 0cf3d2c | 2020-05-08 19:24:52 -0700 | [diff] [blame^] | 29 | let t = thread::spawn(move || { |
| 30 | block_on(tx.cancellation()); |
Jason Macnak | 09c3688 | 2020-04-01 16:22:56 +0000 | [diff] [blame] | 31 | }); |
| 32 | drop(rx); |
| 33 | t.join().unwrap(); |
| 34 | } |
| 35 | |
Jason Macnak | 09c3688 | 2020-04-01 16:22:56 +0000 | [diff] [blame] | 36 | #[test] |
| 37 | fn cancel_lots() { |
| 38 | let (tx, rx) = mpsc::channel::<(Sender<_>, mpsc::Sender<_>)>(); |
| 39 | let t = thread::spawn(move || { |
Haibo Huang | 0cf3d2c | 2020-05-08 19:24:52 -0700 | [diff] [blame^] | 40 | for (mut tx, tx2) in rx { |
| 41 | block_on(tx.cancellation()); |
Jason Macnak | 09c3688 | 2020-04-01 16:22:56 +0000 | [diff] [blame] | 42 | tx2.send(()).unwrap(); |
| 43 | } |
| 44 | }); |
| 45 | |
| 46 | for _ in 0..20000 { |
| 47 | let (otx, orx) = oneshot::channel::<u32>(); |
| 48 | let (tx2, rx2) = mpsc::channel(); |
| 49 | tx.send((otx, tx2)).unwrap(); |
| 50 | drop(orx); |
| 51 | rx2.recv().unwrap(); |
| 52 | } |
| 53 | drop(tx); |
| 54 | |
| 55 | t.join().unwrap(); |
| 56 | } |
| 57 | |
| 58 | #[test] |
| 59 | fn cancel_after_sender_drop_doesnt_notify() { |
| 60 | let (mut tx, rx) = oneshot::channel::<u32>(); |
| 61 | let mut cx = Context::from_waker(panic_waker_ref()); |
| 62 | assert_eq!(tx.poll_canceled(&mut cx), Poll::Pending); |
| 63 | drop(tx); |
| 64 | drop(rx); |
| 65 | } |
| 66 | |
| 67 | #[test] |
| 68 | fn close() { |
| 69 | let (mut tx, mut rx) = oneshot::channel::<u32>(); |
| 70 | rx.close(); |
| 71 | block_on(poll_fn(|cx| { |
| 72 | match rx.poll_unpin(cx) { |
| 73 | Poll::Ready(Err(_)) => {}, |
| 74 | _ => panic!(), |
| 75 | }; |
| 76 | assert!(tx.poll_canceled(cx).is_ready()); |
| 77 | Poll::Ready(()) |
| 78 | })); |
| 79 | } |
| 80 | |
| 81 | #[test] |
| 82 | fn close_wakes() { |
Haibo Huang | 0cf3d2c | 2020-05-08 19:24:52 -0700 | [diff] [blame^] | 83 | let (mut tx, mut rx) = oneshot::channel::<u32>(); |
Jason Macnak | 09c3688 | 2020-04-01 16:22:56 +0000 | [diff] [blame] | 84 | let (tx2, rx2) = mpsc::channel(); |
| 85 | let t = thread::spawn(move || { |
| 86 | rx.close(); |
| 87 | rx2.recv().unwrap(); |
| 88 | }); |
Haibo Huang | 0cf3d2c | 2020-05-08 19:24:52 -0700 | [diff] [blame^] | 89 | block_on(tx.cancellation()); |
Jason Macnak | 09c3688 | 2020-04-01 16:22:56 +0000 | [diff] [blame] | 90 | tx2.send(()).unwrap(); |
| 91 | t.join().unwrap(); |
| 92 | } |
| 93 | |
| 94 | #[test] |
| 95 | fn is_canceled() { |
| 96 | let (tx, rx) = oneshot::channel::<u32>(); |
| 97 | assert!(!tx.is_canceled()); |
| 98 | drop(rx); |
| 99 | assert!(tx.is_canceled()); |
| 100 | } |
| 101 | |
| 102 | #[test] |
| 103 | fn cancel_sends() { |
| 104 | let (tx, rx) = mpsc::channel::<Sender<_>>(); |
| 105 | let t = thread::spawn(move || { |
| 106 | for otx in rx { |
| 107 | let _ = otx.send(42); |
| 108 | } |
| 109 | }); |
| 110 | |
| 111 | for _ in 0..20000 { |
| 112 | let (otx, mut orx) = oneshot::channel::<u32>(); |
| 113 | tx.send(otx).unwrap(); |
| 114 | |
| 115 | orx.close(); |
| 116 | let _ = block_on(orx); |
| 117 | } |
| 118 | |
| 119 | drop(tx); |
| 120 | t.join().unwrap(); |
| 121 | } |
| 122 | |
| 123 | // #[test] |
| 124 | // fn spawn_sends_items() { |
| 125 | // let core = local_executor::Core::new(); |
| 126 | // let future = ok::<_, ()>(1); |
| 127 | // let rx = spawn(future, &core); |
| 128 | // assert_eq!(core.run(rx).unwrap(), 1); |
| 129 | // } |
| 130 | // |
| 131 | // #[test] |
| 132 | // fn spawn_kill_dead_stream() { |
| 133 | // use std::thread; |
| 134 | // use std::time::Duration; |
| 135 | // use futures::future::Either; |
| 136 | // use futures::sync::oneshot; |
| 137 | // |
| 138 | // // a future which never returns anything (forever accepting incoming |
| 139 | // // connections), but dropping it leads to observable side effects |
| 140 | // // (like closing listening sockets, releasing limited resources, |
| 141 | // // ...) |
| 142 | // #[derive(Debug)] |
| 143 | // struct Dead { |
| 144 | // // when dropped you should get Err(oneshot::Canceled) on the |
| 145 | // // receiving end |
| 146 | // done: oneshot::Sender<()>, |
| 147 | // } |
| 148 | // impl Future for Dead { |
| 149 | // type Item = (); |
| 150 | // type Error = (); |
| 151 | // |
| 152 | // fn poll(&mut self) -> Poll<Self::Item, Self::Error> { |
| 153 | // Ok(Poll::Pending) |
| 154 | // } |
| 155 | // } |
| 156 | // |
| 157 | // // need to implement a timeout for the test, as it would hang |
| 158 | // // forever right now |
| 159 | // let (timeout_tx, timeout_rx) = oneshot::channel(); |
| 160 | // thread::spawn(move || { |
| 161 | // thread::sleep(Duration::from_millis(1000)); |
| 162 | // let _ = timeout_tx.send(()); |
| 163 | // }); |
| 164 | // |
| 165 | // let core = local_executor::Core::new(); |
| 166 | // let (done_tx, done_rx) = oneshot::channel(); |
| 167 | // let future = Dead{done: done_tx}; |
| 168 | // let rx = spawn(future, &core); |
| 169 | // let res = core.run( |
| 170 | // Ok::<_, ()>(()) |
| 171 | // .into_future() |
| 172 | // .then(move |_| { |
| 173 | // // now drop the spawned future: maybe some timeout exceeded, |
| 174 | // // or some connection on this end was closed by the remote |
| 175 | // // end. |
| 176 | // drop(rx); |
| 177 | // // and wait for the spawned future to release its resources |
| 178 | // done_rx |
| 179 | // }) |
| 180 | // .select2(timeout_rx) |
| 181 | // ); |
| 182 | // match res { |
| 183 | // Err(Either::A((oneshot::Canceled, _))) => (), |
| 184 | // Ok(Either::B(((), _))) => { |
| 185 | // panic!("dead future wasn't canceled (timeout)"); |
| 186 | // }, |
| 187 | // _ => { |
| 188 | // panic!("dead future wasn't canceled (unexpected result)"); |
| 189 | // }, |
| 190 | // } |
| 191 | // } |
| 192 | // |
| 193 | // #[test] |
| 194 | // fn spawn_dont_kill_forgot_dead_stream() { |
| 195 | // use std::thread; |
| 196 | // use std::time::Duration; |
| 197 | // use futures::future::Either; |
| 198 | // use futures::sync::oneshot; |
| 199 | // |
| 200 | // // a future which never returns anything (forever accepting incoming |
| 201 | // // connections), but dropping it leads to observable side effects |
| 202 | // // (like closing listening sockets, releasing limited resources, |
| 203 | // // ...) |
| 204 | // #[derive(Debug)] |
| 205 | // struct Dead { |
| 206 | // // when dropped you should get Err(oneshot::Canceled) on the |
| 207 | // // receiving end |
| 208 | // done: oneshot::Sender<()>, |
| 209 | // } |
| 210 | // impl Future for Dead { |
| 211 | // type Item = (); |
| 212 | // type Error = (); |
| 213 | // |
| 214 | // fn poll(&mut self) -> Poll<Self::Item, Self::Error> { |
| 215 | // Ok(Poll::Pending) |
| 216 | // } |
| 217 | // } |
| 218 | // |
| 219 | // // need to implement a timeout for the test, as it would hang |
| 220 | // // forever right now |
| 221 | // let (timeout_tx, timeout_rx) = oneshot::channel(); |
| 222 | // thread::spawn(move || { |
| 223 | // thread::sleep(Duration::from_millis(1000)); |
| 224 | // let _ = timeout_tx.send(()); |
| 225 | // }); |
| 226 | // |
| 227 | // let core = local_executor::Core::new(); |
| 228 | // let (done_tx, done_rx) = oneshot::channel(); |
| 229 | // let future = Dead{done: done_tx}; |
| 230 | // let rx = spawn(future, &core); |
| 231 | // let res = core.run( |
| 232 | // Ok::<_, ()>(()) |
| 233 | // .into_future() |
| 234 | // .then(move |_| { |
| 235 | // // forget the spawned future: should keep running, i.e. hit |
| 236 | // // the timeout below. |
| 237 | // rx.forget(); |
| 238 | // // and wait for the spawned future to release its resources |
| 239 | // done_rx |
| 240 | // }) |
| 241 | // .select2(timeout_rx) |
| 242 | // ); |
| 243 | // match res { |
| 244 | // Err(Either::A((oneshot::Canceled, _))) => { |
| 245 | // panic!("forgotten dead future was canceled"); |
| 246 | // }, |
| 247 | // Ok(Either::B(((), _))) => (), // reached timeout |
| 248 | // _ => { |
| 249 | // panic!("forgotten dead future was canceled (unexpected result)"); |
| 250 | // }, |
| 251 | // } |
| 252 | // } |