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# -*- coding: utf-8 -*-
# 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 six.moves import range
from twisted.internet import defer, reactor
from twisted.internet.defer import CancelledError
from synapse.util import Clock, logcontext
from synapse.util.async 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
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 logcontext.LoggingContext("func(%s)" % i) as lc:
with (yield linearizer.queue("")):
self.assertEqual(
logcontext.LoggingContext.current_context(), lc)
if sleep:
yield Clock(reactor).sleep(0)
self.assertEqual(
logcontext.LoggingContext.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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