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Test and fix support for cancellation in Linearizer
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@ -184,13 +184,13 @@ class Linearizer(object):
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# key_to_defer is a map from the key to a 2 element list where
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# key_to_defer is a map from the key to a 2 element list where
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# the first element is the number of things executing, and
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# the first element is the number of things executing, and
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# the second element is a deque of deferreds for the things blocked from
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# the second element is an OrderedDict, where the keys are deferreds for the
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# executing.
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# things blocked from executing.
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self.key_to_defer = {}
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self.key_to_defer = {}
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@defer.inlineCallbacks
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@defer.inlineCallbacks
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def queue(self, key):
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def queue(self, key):
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entry = self.key_to_defer.setdefault(key, [0, collections.deque()])
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entry = self.key_to_defer.setdefault(key, [0, collections.OrderedDict()])
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# If the number of things executing is greater than the maximum
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# If the number of things executing is greater than the maximum
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# then add a deferred to the list of blocked items
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# then add a deferred to the list of blocked items
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@ -198,12 +198,28 @@ class Linearizer(object):
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# this item so that it can continue executing.
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# this item so that it can continue executing.
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if entry[0] >= self.max_count:
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if entry[0] >= self.max_count:
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new_defer = defer.Deferred()
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new_defer = defer.Deferred()
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entry[1].append(new_defer)
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entry[1][new_defer] = 1
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logger.info(
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logger.info(
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"Waiting to acquire linearizer lock %r for key %r", self.name, key,
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"Waiting to acquire linearizer lock %r for key %r", self.name, key,
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)
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)
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yield make_deferred_yieldable(new_defer)
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try:
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yield make_deferred_yieldable(new_defer)
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except Exception as e:
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if isinstance(e, CancelledError):
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logger.info(
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"Cancelling wait for linearizer lock %r for key %r",
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self.name, key,
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)
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else:
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logger.warn(
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"Unexpected exception waiting for linearizer lock %r for key %r",
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self.name, key,
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)
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# we just have to take ourselves back out of the queue.
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del entry[1][new_defer]
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raise
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logger.info("Acquired linearizer lock %r for key %r", self.name, key)
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logger.info("Acquired linearizer lock %r for key %r", self.name, key)
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entry[0] += 1
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entry[0] += 1
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@ -238,7 +254,7 @@ class Linearizer(object):
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entry[0] -= 1
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entry[0] -= 1
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if entry[1]:
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if entry[1]:
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next_def = entry[1].popleft()
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(next_def, _) = entry[1].popitem(last=False)
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# we need to run the next thing in the sentinel context.
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# we need to run the next thing in the sentinel context.
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with PreserveLoggingContext():
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with PreserveLoggingContext():
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@ -17,6 +17,7 @@
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from six.moves import range
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from six.moves import range
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from twisted.internet import defer, reactor
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from twisted.internet import defer, reactor
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from twisted.internet.defer import CancelledError
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from synapse.util import Clock, logcontext
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from synapse.util import Clock, logcontext
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from synapse.util.async import Linearizer
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from synapse.util.async import Linearizer
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@ -112,3 +113,33 @@ class LinearizerTestCase(unittest.TestCase):
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d6 = limiter.queue(key)
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d6 = limiter.queue(key)
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with (yield d6):
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with (yield d6):
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pass
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pass
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@defer.inlineCallbacks
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def test_cancellation(self):
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linearizer = Linearizer()
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key = object()
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d1 = linearizer.queue(key)
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cm1 = yield d1
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d2 = linearizer.queue(key)
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self.assertFalse(d2.called)
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d3 = linearizer.queue(key)
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self.assertFalse(d3.called)
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d2.cancel()
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with cm1:
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pass
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self.assertTrue(d2.called)
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try:
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yield d2
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self.fail("Expected d2 to raise CancelledError")
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except CancelledError:
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pass
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with (yield d3):
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pass
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