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# Copyright 2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from twisted.internet import defer, reactor
from twisted.internet.defer import CancelledError
from synapse.logging.context import LoggingContext, current_context
from synapse.util import Clock
from synapse.util.async_helpers import Linearizer
from tests import unittest
class LinearizerTestCase(unittest.TestCase):
@defer.inlineCallbacks
def test_linearizer(self):
linearizer = Linearizer()
key = object()
d1 = linearizer.queue(key)
cm1 = yield d1
d2 = linearizer.queue(key)
self.assertFalse(d2.called)
with cm1:
self.assertFalse(d2.called)
with (yield d2):
pass
@defer.inlineCallbacks
def test_linearizer_is_queued(self):
linearizer = Linearizer()
key = object()
d1 = linearizer.queue(key)
cm1 = yield d1
# Since d1 gets called immediately, "is_queued" should return false.
self.assertFalse(linearizer.is_queued(key))
d2 = linearizer.queue(key)
self.assertFalse(d2.called)
# Now d2 is queued up behind successful completion of cm1
self.assertTrue(linearizer.is_queued(key))
with cm1:
self.assertFalse(d2.called)
# cm1 still not done, so d2 still queued.
self.assertTrue(linearizer.is_queued(key))
# And now d2 is called and nothing is in the queue again
self.assertFalse(linearizer.is_queued(key))
with (yield d2):
self.assertFalse(linearizer.is_queued(key))
self.assertFalse(linearizer.is_queued(key))
def test_lots_of_queued_things(self):
# we have one slow thing, and lots of fast things queued up behind it.
# it should *not* explode the stack.
linearizer = Linearizer()
@defer.inlineCallbacks
def func(i, sleep=False):
with LoggingContext("func(%s)" % i) as lc:
with (yield linearizer.queue("")):
self.assertEqual(current_context(), lc)
if sleep:
yield Clock(reactor).sleep(0)
self.assertEqual(current_context(), lc)
func(0, sleep=True)
for i in range(1, 100):
func(i)
return func(1000)
@defer.inlineCallbacks
def test_multiple_entries(self):
limiter = Linearizer(max_count=3)
key = object()
d1 = limiter.queue(key)
cm1 = yield d1
d2 = limiter.queue(key)
cm2 = yield d2
d3 = limiter.queue(key)
cm3 = yield d3
d4 = limiter.queue(key)
self.assertFalse(d4.called)
d5 = limiter.queue(key)
self.assertFalse(d5.called)
with cm1:
self.assertFalse(d4.called)
self.assertFalse(d5.called)
cm4 = yield d4
self.assertFalse(d5.called)
with cm3:
self.assertFalse(d5.called)
cm5 = yield d5
with cm2:
pass
with cm4:
pass
with cm5:
pass
d6 = limiter.queue(key)
with (yield d6):
pass
@defer.inlineCallbacks
def test_cancellation(self):
linearizer = Linearizer()
key = object()
d1 = linearizer.queue(key)
cm1 = yield d1
d2 = linearizer.queue(key)
self.assertFalse(d2.called)
d3 = linearizer.queue(key)
self.assertFalse(d3.called)
d2.cancel()
with cm1:
pass
self.assertTrue(d2.called)
try:
yield d2
self.fail("Expected d2 to raise CancelledError")
except CancelledError:
pass
with (yield d3):
pass
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