Add run_until_cancelled_owned to CancellationToken

Author: tysen

Diff for: tokio-util/src/sync/cancellation_token.rs

@@ -287,6 +287,55 @@ impl CancellationToken {
         }
         .await
     }
+
+    /// Runs a future to completion and returns its result wrapped inside of an `Option`
+    /// unless the `CancellationToken` is cancelled. In that case the function returns
+    /// `None` and the future gets dropped.
+    /// 
+    /// The function takes self by value.
+    ///
+    /// # Cancel safety
+    ///
+    /// This method is only cancel safe if `fut` is cancel safe.
+    pub async fn run_until_cancelled_owned<F>(self, fut: F) -> Option<F::Output>
+    where
+        F: Future,
+    {
+        pin_project! {
+            /// A Future that is resolved once the corresponding [`CancellationToken`]
+            /// is cancelled or a given Future gets resolved. It is biased towards the
+            /// Future completion.
+            #[must_use = "futures do nothing unless polled"]
+            struct RunUntilCancelledFuture<F: Future> {
+                #[pin]
+                cancellation: WaitForCancellationFutureOwned,
+                #[pin]
+                future: F,
+            }
+        }
+
+        impl<F: Future> Future for RunUntilCancelledFuture<F> {
+            type Output = Option<F::Output>;
+
+            fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+                let this = self.project();
+                if let Poll::Ready(res) = this.future.poll(cx) {
+                    Poll::Ready(Some(res))
+                } else if this.cancellation.poll(cx).is_ready() {
+                    Poll::Ready(None)
+                } else {
+                    Poll::Pending
+                }
+            }
+        }
+
+        RunUntilCancelledFuture {
+            cancellation: self.cancelled_owned(),
+            future: fut,
+        }
+        .await
+    }
+
 }
 
 // ===== impl WaitForCancellationFuture =====

Diff for: tokio-util/tests/sync_cancellation_token.rs

@@ -493,3 +493,51 @@ fn run_until_cancelled_test() {
         );
     }
 }
+
+#[test]
+fn run_until_cancelled_owned_test() {
+    let (waker, _) = new_count_waker();
+
+    {
+        let token = CancellationToken::new();
+        let to_cancel = token.clone();
+
+        let fut = token.run_until_cancelled_owned(std::future::pending::<()>());
+        pin!(fut);
+
+        assert_eq!(
+            Poll::Pending,
+            fut.as_mut().poll(&mut Context::from_waker(&waker))
+        );
+
+        to_cancel.cancel();
+
+        assert_eq!(
+            Poll::Ready(None),
+            fut.as_mut().poll(&mut Context::from_waker(&waker))
+        );
+    }
+
+    {
+        let (tx, rx) = oneshot::channel::<()>();
+
+        let token = CancellationToken::new();
+        let fut = token.run_until_cancelled_owned(async move {
+            rx.await.unwrap();
+            42
+        });
+        pin!(fut);
+
+        assert_eq!(
+            Poll::Pending,
+            fut.as_mut().poll(&mut Context::from_waker(&waker))
+        );
+
+        tx.send(()).unwrap();
+
+        assert_eq!(
+            Poll::Ready(Some(42)),
+            fut.as_mut().poll(&mut Context::from_waker(&waker))
+        );
+    }
+}