107 lines
3.6 KiB
Python
107 lines
3.6 KiB
Python
# Copyright 2019 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer
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from twisted.internet.defer import CancelledError, Deferred
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from twisted.internet.task import Clock
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from synapse.logging.context import (
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SENTINEL_CONTEXT,
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LoggingContext,
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PreserveLoggingContext,
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current_context,
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)
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from synapse.util.async_helpers import timeout_deferred
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from tests.unittest import TestCase
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class TimeoutDeferredTest(TestCase):
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def setUp(self):
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self.clock = Clock()
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def test_times_out(self):
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"""Basic test case that checks that the original deferred is cancelled and that
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the timing-out deferred is errbacked
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"""
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cancelled = [False]
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def canceller(_d):
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cancelled[0] = True
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non_completing_d = Deferred(canceller)
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timing_out_d = timeout_deferred(non_completing_d, 1.0, self.clock)
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self.assertNoResult(timing_out_d)
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self.assertFalse(cancelled[0], "deferred was cancelled prematurely")
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self.clock.pump((1.0,))
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self.assertTrue(cancelled[0], "deferred was not cancelled by timeout")
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self.failureResultOf(timing_out_d, defer.TimeoutError)
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def test_times_out_when_canceller_throws(self):
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"""Test that we have successfully worked around
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https://twistedmatrix.com/trac/ticket/9534"""
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def canceller(_d):
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raise Exception("can't cancel this deferred")
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non_completing_d = Deferred(canceller)
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timing_out_d = timeout_deferred(non_completing_d, 1.0, self.clock)
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self.assertNoResult(timing_out_d)
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self.clock.pump((1.0,))
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self.failureResultOf(timing_out_d, defer.TimeoutError)
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def test_logcontext_is_preserved_on_cancellation(self):
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blocking_was_cancelled = [False]
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@defer.inlineCallbacks
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def blocking():
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non_completing_d = Deferred()
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with PreserveLoggingContext():
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try:
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yield non_completing_d
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except CancelledError:
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blocking_was_cancelled[0] = True
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raise
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with LoggingContext("one") as context_one:
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# the errbacks should be run in the test logcontext
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def errback(res, deferred_name):
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self.assertIs(
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current_context(),
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context_one,
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"errback %s run in unexpected logcontext %s"
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% (deferred_name, current_context()),
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)
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return res
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original_deferred = blocking()
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original_deferred.addErrback(errback, "orig")
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timing_out_d = timeout_deferred(original_deferred, 1.0, self.clock)
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self.assertNoResult(timing_out_d)
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self.assertIs(current_context(), SENTINEL_CONTEXT)
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timing_out_d.addErrback(errback, "timingout")
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self.clock.pump((1.0,))
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self.assertTrue(
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blocking_was_cancelled[0], "non-completing deferred was not cancelled"
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)
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self.failureResultOf(timing_out_d, defer.TimeoutError)
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self.assertIs(current_context(), context_one)
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