mirror of
https://github.com/status-im/nim-chronos.git
synced 2025-02-05 16:03:45 +00:00
Add wait(deadline future) implementation. (#535)
* Add waitUntil(deadline) implementation. * Add one more test. * Fix rare race condition and tests for it. * Rename waitUntil() to wait().
This commit is contained in:
Eugene Kabanov
GitHub
parent
d184a92227
commit
0f0ed1d654
@ -1529,6 +1529,60 @@ proc withTimeout*[T](fut: Future[T], timeout: int): Future[bool] {.
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inline, deprecated: "Use withTimeout(Future[T], Duration)".} =
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withTimeout(fut, timeout.milliseconds())
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proc waitUntilImpl[F: SomeFuture](fut: F, retFuture: auto,
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deadline: auto): auto =
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var timeouted = false
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template completeFuture(fut: untyped, timeout: bool): untyped =
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if fut.failed():
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retFuture.fail(fut.error(), warn = false)
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elif fut.cancelled():
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if timeout:
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# Its possible that `future` could be cancelled in some other place. In
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# such case we can't detect if it was our cancellation due to timeout,
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# or some other cancellation.
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retFuture.fail(newException(AsyncTimeoutError, "Timeout exceeded!"))
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else:
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retFuture.cancelAndSchedule()
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else:
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when type(fut).T is void:
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retFuture.complete()
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else:
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retFuture.complete(fut.value)
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proc continuation(udata: pointer) {.raises: [].} =
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if not(retFuture.finished()):
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if timeouted:
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# When timeout is exceeded and we cancelled future via cancelSoon(),
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# its possible that future at this moment already has value
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# and/or error.
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fut.completeFuture(timeouted)
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return
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if not(fut.finished()):
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timeouted = true
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fut.cancelSoon()
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else:
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fut.completeFuture(false)
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var cancellation: proc(udata: pointer) {.gcsafe, raises: [].}
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cancellation = proc(udata: pointer) {.gcsafe, raises: [].} =
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deadline.removeCallback(continuation)
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if not(fut.finished()):
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fut.cancelSoon()
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else:
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fut.completeFuture(false)
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if fut.finished():
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fut.completeFuture(false)
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else:
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if deadline.finished():
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retFuture.fail(newException(AsyncTimeoutError, "Timeout exceeded!"))
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else:
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retFuture.cancelCallback = cancellation
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fut.addCallback(continuation)
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deadline.addCallback(continuation)
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retFuture
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proc waitImpl[F: SomeFuture](fut: F, retFuture: auto, timeout: Duration): auto =
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var
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moment: Moment
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@ -1606,7 +1660,8 @@ proc wait*[T](fut: Future[T], timeout = InfiniteDuration): Future[T] =
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## TODO: In case when ``fut`` got cancelled, what result Future[T]
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## should return, because it can't be cancelled too.
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var
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retFuture = newFuture[T]("chronos.wait()", {FutureFlag.OwnCancelSchedule})
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retFuture = newFuture[T]("chronos.wait(duration)",
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{FutureFlag.OwnCancelSchedule})
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# We set `OwnCancelSchedule` flag, because we going to cancel `retFuture`
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# manually at proper time.
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@ -1621,6 +1676,28 @@ proc wait*[T](fut: Future[T], timeout = -1): Future[T] {.
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else:
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wait(fut, timeout.milliseconds())
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proc wait*[T](fut: Future[T], deadline: SomeFuture): Future[T] =
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## Returns a future which will complete once future ``fut`` completes
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## or if ``deadline`` future completes.
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##
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## If `deadline` future completes before future `fut` -
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## `AsyncTimeoutError` exception will be raised.
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##
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## Note: `deadline` future will not be cancelled and/or failed.
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##
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## Note: While `waitUntil(future)` operation is pending, please avoid any
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## attempts to cancel future `fut`. If it happens `waitUntil()` could
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## introduce undefined behavior - it could raise`CancelledError` or
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## `AsyncTimeoutError`.
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##
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## If you need to cancel `future` - cancel `waitUntil(future)` instead.
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var
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retFuture = newFuture[T]("chronos.wait(future)",
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{FutureFlag.OwnCancelSchedule})
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# We set `OwnCancelSchedule` flag, because we going to cancel `retFuture`
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# manually at proper time.
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waitUntilImpl(fut, retFuture, deadline)
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proc join*(future: FutureBase): Future[void] {.
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async: (raw: true, raises: [CancelledError]).} =
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## Returns a future which will complete once future ``future`` completes.
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@ -1783,8 +1860,21 @@ proc wait*(fut: InternalRaisesFuture, timeout = InfiniteDuration): auto =
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InternalRaisesFutureRaises = E.prepend(CancelledError, AsyncTimeoutError)
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let
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retFuture = newFuture[T]("chronos.wait()", {OwnCancelSchedule})
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retFuture = newFuture[T]("chronos.wait(duration)", {OwnCancelSchedule})
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# We set `OwnCancelSchedule` flag, because we going to cancel `retFuture`
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# manually at proper time.
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waitImpl(fut, retFuture, timeout)
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proc wait*(fut: InternalRaisesFuture, deadline: InternalRaisesFuture): auto =
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type
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T = type(fut).T
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E = type(fut).E
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InternalRaisesFutureRaises = E.prepend(CancelledError, AsyncTimeoutError)
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let
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retFuture = newFuture[T]("chronos.wait(future)", {OwnCancelSchedule})
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# We set `OwnCancelSchedule` flag, because we going to cancel `retFuture`
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# manually at proper time.
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waitUntilImpl(fut, retFuture, deadline)
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@ -83,7 +83,7 @@ suite "Future[T] behavior test suite":
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fut.finished
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testResult == "1245"
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asyncTest "wait[T]() test":
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asyncTest "wait(duration) test":
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block:
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## Test for not immediately completed future and timeout = -1
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let res =
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@ -146,6 +146,183 @@ suite "Future[T] behavior test suite":
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false
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check res
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asyncTest "wait(future) test":
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block:
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## Test for not immediately completed future and deadline which is not
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## going to be finished
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let
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deadline = newFuture[void]()
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future1 = testFuture1()
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let res =
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try:
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discard await wait(future1, deadline)
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true
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except CatchableError:
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false
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check:
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deadline.finished() == false
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future1.finished() == true
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res == true
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await deadline.cancelAndWait()
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check deadline.finished() == true
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block:
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## Test for immediately completed future and timeout = -1
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let
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deadline = newFuture[void]()
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future2 = testFuture2()
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let res =
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try:
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discard await wait(future2, deadline)
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true
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except CatchableError:
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false
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check:
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deadline.finished() == false
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future2.finished() == true
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res
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await deadline.cancelAndWait()
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check deadline.finished() == true
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block:
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## Test for not immediately completed future and timeout = 0
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let
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deadline = newFuture[void]()
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future1 = testFuture1()
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deadline.complete()
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let res =
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try:
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discard await wait(future1, deadline)
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false
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except AsyncTimeoutError:
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true
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except CatchableError:
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false
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check:
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future1.finished() == false
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deadline.finished() == true
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res
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block:
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## Test for immediately completed future and timeout = 0
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let
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deadline = newFuture[void]()
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future2 = testFuture2()
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deadline.complete()
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let (res1, res2) =
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try:
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let res = await wait(future2, deadline)
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(true, res)
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except CatchableError:
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(false, -1)
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check:
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future2.finished() == true
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deadline.finished() == true
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res1 == true
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res2 == 1
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block:
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## Test for future which cannot be completed in timeout period
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let
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deadline = sleepAsync(50.milliseconds)
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future100 = testFuture100()
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let res =
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try:
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discard await wait(future100, deadline)
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false
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except AsyncTimeoutError:
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true
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except CatchableError:
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false
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check:
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deadline.finished() == true
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res
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await future100.cancelAndWait()
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check:
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future100.finished() == true
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block:
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## Test for future which will be completed before timeout exceeded.
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let
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deadline = sleepAsync(500.milliseconds)
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future100 = testFuture100()
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let (res1, res2) =
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try:
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let res = await wait(future100, deadline)
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(true, res)
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except CatchableError:
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(false, -1)
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check:
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future100.finished() == true
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deadline.finished() == false
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res1 == true
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res2 == 0
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await deadline.cancelAndWait()
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check:
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deadline.finished() == true
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asyncTest "wait(future) cancellation behavior test":
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proc deepTest3(future: Future[void]) {.async.} =
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await future
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proc deepTest2(future: Future[void]) {.async.} =
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await deepTest3(future)
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proc deepTest1(future: Future[void]) {.async.} =
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await deepTest2(future)
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let
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deadlineFuture = newFuture[void]()
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block:
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# Cancellation should affect `testFuture` because it is in pending state.
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let monitorFuture = newFuture[void]()
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var testFuture = deepTest1(monitorFuture)
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let waitFut = wait(testFuture, deadlineFuture)
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await cancelAndWait(waitFut)
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check:
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monitorFuture.cancelled() == true
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testFuture.cancelled() == true
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waitFut.cancelled() == true
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deadlineFuture.finished() == false
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block:
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# Cancellation should not affect `testFuture` because it is completed.
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let monitorFuture = newFuture[void]()
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var testFuture = deepTest1(monitorFuture)
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let waitFut = wait(testFuture, deadlineFuture)
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monitorFuture.complete()
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await cancelAndWait(waitFut)
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check:
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monitorFuture.completed() == true
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monitorFuture.cancelled() == false
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testFuture.completed() == true
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waitFut.completed() == true
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deadlineFuture.finished() == false
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block:
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# Cancellation should not affect `testFuture` because it is failed.
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let monitorFuture = newFuture[void]()
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var testFuture = deepTest1(monitorFuture)
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let waitFut = wait(testFuture, deadlineFuture)
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monitorFuture.fail(newException(ValueError, "TEST"))
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await cancelAndWait(waitFut)
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check:
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monitorFuture.failed() == true
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monitorFuture.cancelled() == false
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testFuture.failed() == true
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testFuture.cancelled() == false
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waitFut.failed() == true
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testFuture.cancelled() == false
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deadlineFuture.finished() == false
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await cancelAndWait(deadlineFuture)
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check deadlineFuture.finished() == true
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asyncTest "Discarded result Future[T] test":
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var completedFutures = 0
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@ -1082,7 +1259,7 @@ suite "Future[T] behavior test suite":
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completed == 0
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cancelled == 1
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asyncTest "Cancellation wait() test":
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asyncTest "Cancellation wait(duration) test":
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var neverFlag1, neverFlag2, neverFlag3: bool
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var waitProc1, waitProc2: bool
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proc neverEndingProc(): Future[void] =
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@ -1143,7 +1320,39 @@ suite "Future[T] behavior test suite":
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fut.state == FutureState.Completed
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neverFlag1 and neverFlag2 and neverFlag3 and waitProc1 and waitProc2
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asyncTest "Cancellation race test":
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asyncTest "Cancellation wait(future) test":
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var neverFlag1, neverFlag2, neverFlag3: bool
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var waitProc1, waitProc2: bool
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proc neverEndingProc(): Future[void] =
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var res = newFuture[void]()
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proc continuation(udata: pointer) {.gcsafe.} =
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neverFlag2 = true
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proc cancellation(udata: pointer) {.gcsafe.} =
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neverFlag3 = true
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res.addCallback(continuation)
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res.cancelCallback = cancellation
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result = res
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neverFlag1 = true
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proc waitProc() {.async.} =
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let deadline = sleepAsync(100.milliseconds)
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try:
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await wait(neverEndingProc(), deadline)
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except CancelledError:
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waitProc1 = true
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except CatchableError:
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doAssert(false)
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finally:
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await cancelAndWait(deadline)
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waitProc2 = true
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var fut = waitProc()
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await cancelAndWait(fut)
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check:
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fut.state == FutureState.Completed
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neverFlag1 and neverFlag2 and neverFlag3 and waitProc1 and waitProc2
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asyncTest "Cancellation race() test":
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var someFut = newFuture[void]()
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proc raceProc(): Future[void] {.async.} =
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@ -1298,7 +1507,7 @@ suite "Future[T] behavior test suite":
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false
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check res
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asyncTest "wait(fut) should wait cancellation test":
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asyncTest "wait(future) should wait cancellation test":
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proc futureNeverEnds(): Future[void] =
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newFuture[void]("neverending.future")
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@ -1322,6 +1531,29 @@ suite "Future[T] behavior test suite":
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check res
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asyncTest "wait(future) should wait cancellation test":
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proc futureNeverEnds(): Future[void] =
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newFuture[void]("neverending.future")
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proc futureOneLevelMore() {.async.} =
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await futureNeverEnds()
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var fut = futureOneLevelMore()
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let res =
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try:
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await wait(fut, sleepAsync(100.milliseconds))
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false
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except AsyncTimeoutError:
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# Because `fut` is never-ending Future[T], `wait` should raise
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# `AsyncTimeoutError`, but only after `fut` is cancelled.
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if fut.cancelled():
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true
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else:
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false
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except CatchableError:
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false
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check res
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test "race(zero) test":
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var tseq = newSeq[FutureBase]()
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var fut1 = race(tseq)
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@ -1563,7 +1795,7 @@ suite "Future[T] behavior test suite":
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v1_u == 0'u
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v2_u + 1'u == 0'u
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asyncTest "wait() cancellation undefined behavior test #1":
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asyncTest "wait(duration) cancellation undefined behavior test #1":
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proc testInnerFoo(fooFut: Future[void]): Future[TestFooConnection] {.
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async.} =
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await fooFut
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@ -1586,7 +1818,7 @@ suite "Future[T] behavior test suite":
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discard someFut.tryCancel()
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await someFut
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asyncTest "wait() cancellation undefined behavior test #2":
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asyncTest "wait(duration) cancellation undefined behavior test #2":
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proc testInnerFoo(fooFut: Future[void]): Future[TestFooConnection] {.
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async.} =
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await fooFut
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@ -1613,7 +1845,7 @@ suite "Future[T] behavior test suite":
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discard someFut.tryCancel()
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await someFut
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asyncTest "wait() should allow cancellation test (depends on race())":
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asyncTest "wait(duration) should allow cancellation test (depends on race())":
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proc testFoo(): Future[bool] {.async.} =
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let
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resFut = sleepAsync(2.seconds).wait(3.seconds)
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@ -1699,6 +1931,78 @@ suite "Future[T] behavior test suite":
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check (await testFoo()) == true
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asyncTest "wait(future) cancellation undefined behavior test #1":
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proc testInnerFoo(fooFut: Future[void]): Future[TestFooConnection] {.
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async.} =
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await fooFut
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return TestFooConnection()
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proc testFoo(fooFut: Future[void]) {.async.} =
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let deadline = sleepAsync(10.seconds)
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let connection =
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try:
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let res = await testInnerFoo(fooFut).wait(deadline)
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Result[TestFooConnection, int].ok(res)
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except CancelledError:
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Result[TestFooConnection, int].err(0)
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except CatchableError:
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Result[TestFooConnection, int].err(1)
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finally:
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await deadline.cancelAndWait()
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check connection.isOk()
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var future = newFuture[void]("last.child.future")
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var someFut = testFoo(future)
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future.complete()
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discard someFut.tryCancel()
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await someFut
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asyncTest "wait(future) cancellation undefined behavior test #2":
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proc testInnerFoo(fooFut: Future[void]): Future[TestFooConnection] {.
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async.} =
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await fooFut
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return TestFooConnection()
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proc testMiddleFoo(fooFut: Future[void]): Future[TestFooConnection] {.
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async.} =
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await testInnerFoo(fooFut)
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proc testFoo(fooFut: Future[void]) {.async.} =
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let deadline = sleepAsync(10.seconds)
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let connection =
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try:
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let res = await testMiddleFoo(fooFut).wait(deadline)
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Result[TestFooConnection, int].ok(res)
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except CancelledError:
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Result[TestFooConnection, int].err(0)
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except CatchableError:
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Result[TestFooConnection, int].err(1)
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finally:
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await deadline.cancelAndWait()
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check connection.isOk()
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var future = newFuture[void]("last.child.future")
|
||||
var someFut = testFoo(future)
|
||||
future.complete()
|
||||
discard someFut.tryCancel()
|
||||
await someFut
|
||||
|
||||
asyncTest "wait(future) should allow cancellation test (depends on race())":
|
||||
proc testFoo(): Future[bool] {.async.} =
|
||||
let
|
||||
deadline = sleepAsync(3.seconds)
|
||||
resFut = sleepAsync(2.seconds).wait(deadline)
|
||||
timeFut = sleepAsync(1.seconds)
|
||||
cancelFut = cancelAndWait(resFut)
|
||||
discard await race(cancelFut, timeFut)
|
||||
await deadline.cancelAndWait()
|
||||
if cancelFut.finished():
|
||||
return (resFut.cancelled() and cancelFut.completed())
|
||||
false
|
||||
|
||||
check (await testFoo()) == true
|
||||
|
||||
asyncTest "Cancellation behavior test":
|
||||
proc testInnerFoo(fooFut: Future[void]) {.async.} =
|
||||
await fooFut
|
||||
@ -2178,7 +2482,7 @@ suite "Future[T] behavior test suite":
|
||||
not compiles(Future[void].Raising([42]))
|
||||
not compiles(Future[void].Raising(42))
|
||||
|
||||
asyncTest "Timeout/cancellation race wait() test":
|
||||
asyncTest "Timeout/cancellation race wait(duration) test":
|
||||
proc raceTest(T: typedesc, itype: int) {.async.} =
|
||||
let monitorFuture = newFuture[T]("monitor",
|
||||
{FutureFlag.OwnCancelSchedule})
|
||||
@ -2252,6 +2556,83 @@ suite "Future[T] behavior test suite":
|
||||
await raceTest(int, 1)
|
||||
await raceTest(int, 2)
|
||||
|
||||
asyncTest "Timeout/cancellation race wait(future) test":
|
||||
proc raceTest(T: typedesc, itype: int) {.async.} =
|
||||
let monitorFuture = newFuture[T]()
|
||||
|
||||
proc raceProc0(future: Future[T]): Future[T] {.async.} =
|
||||
await future
|
||||
proc raceProc1(future: Future[T]): Future[T] {.async.} =
|
||||
await raceProc0(future)
|
||||
proc raceProc2(future: Future[T]): Future[T] {.async.} =
|
||||
await raceProc1(future)
|
||||
|
||||
proc continuation(udata: pointer) {.gcsafe.} =
|
||||
if itype == 0:
|
||||
when T is void:
|
||||
monitorFuture.complete()
|
||||
elif T is int:
|
||||
monitorFuture.complete(100)
|
||||
elif itype == 1:
|
||||
monitorFuture.fail(newException(ValueError, "test"))
|
||||
else:
|
||||
monitorFuture.cancelAndSchedule()
|
||||
|
||||
let deadlineFuture = newFuture[void]()
|
||||
deadlineFuture.addCallback continuation
|
||||
|
||||
let
|
||||
testFut = raceProc2(monitorFuture)
|
||||
waitFut = wait(testFut, deadlineFuture)
|
||||
|
||||
deadlineFuture.complete()
|
||||
|
||||
when T is void:
|
||||
let waitRes =
|
||||
try:
|
||||
await waitFut
|
||||
if itype == 0:
|
||||
true
|
||||
else:
|
||||
false
|
||||
except CancelledError:
|
||||
false
|
||||
except CatchableError:
|
||||
if itype != 0:
|
||||
true
|
||||
else:
|
||||
false
|
||||
check waitRes == true
|
||||
elif T is int:
|
||||
let waitRes =
|
||||
try:
|
||||
let res = await waitFut
|
||||
if itype == 0:
|
||||
(true, res)
|
||||
else:
|
||||
(false, -1)
|
||||
except CancelledError:
|
||||
(false, -1)
|
||||
except CatchableError:
|
||||
if itype != 0:
|
||||
(true, 0)
|
||||
else:
|
||||
(false, -1)
|
||||
if itype == 0:
|
||||
check:
|
||||
waitRes[0] == true
|
||||
waitRes[1] == 100
|
||||
else:
|
||||
check:
|
||||
waitRes[0] == true
|
||||
|
||||
await raceTest(void, 0)
|
||||
await raceTest(void, 1)
|
||||
await raceTest(void, 2)
|
||||
await raceTest(int, 0)
|
||||
await raceTest(int, 1)
|
||||
await raceTest(int, 2)
|
||||
|
||||
asyncTest "Timeout/cancellation race withTimeout() test":
|
||||
proc raceTest(T: typedesc, itype: int) {.async.} =
|
||||
let monitorFuture = newFuture[T]("monitor",
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user