149 lines
5.5 KiB
Python
149 lines
5.5 KiB
Python
# Copyright 2018-2021 The Matrix.org Foundation C.I.C.
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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 http import HTTPStatus
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from unittest.mock import Mock, call
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from twisted.internet import defer, reactor
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from synapse.logging.context import SENTINEL_CONTEXT, LoggingContext, current_context
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from synapse.rest.client.transactions import CLEANUP_PERIOD_MS, HttpTransactionCache
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from synapse.util import Clock
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from tests import unittest
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from tests.test_utils import make_awaitable
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from tests.utils import MockClock
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class HttpTransactionCacheTestCase(unittest.TestCase):
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def setUp(self) -> None:
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self.clock = MockClock()
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self.hs = Mock()
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self.hs.get_clock = Mock(return_value=self.clock)
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self.hs.get_auth = Mock()
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self.cache = HttpTransactionCache(self.hs)
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self.mock_http_response = (HTTPStatus.OK, "GOOD JOB!")
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self.mock_key = "foo"
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@defer.inlineCallbacks
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def test_executes_given_function(self):
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cb = Mock(return_value=make_awaitable(self.mock_http_response))
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res = yield self.cache.fetch_or_execute(
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self.mock_key, cb, "some_arg", keyword="arg"
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)
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cb.assert_called_once_with("some_arg", keyword="arg")
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self.assertEqual(res, self.mock_http_response)
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@defer.inlineCallbacks
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def test_deduplicates_based_on_key(self):
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cb = Mock(return_value=make_awaitable(self.mock_http_response))
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for i in range(3): # invoke multiple times
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res = yield self.cache.fetch_or_execute(
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self.mock_key, cb, "some_arg", keyword="arg", changing_args=i
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)
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self.assertEqual(res, self.mock_http_response)
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# expect only a single call to do the work
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cb.assert_called_once_with("some_arg", keyword="arg", changing_args=0)
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@defer.inlineCallbacks
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def test_logcontexts_with_async_result(self):
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@defer.inlineCallbacks
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def cb():
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yield Clock(reactor).sleep(0)
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return "yay"
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@defer.inlineCallbacks
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def test():
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with LoggingContext("c") as c1:
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res = yield self.cache.fetch_or_execute(self.mock_key, cb)
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self.assertIs(current_context(), c1)
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self.assertEqual(res, "yay")
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# run the test twice in parallel
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d = defer.gatherResults([test(), test()])
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self.assertIs(current_context(), SENTINEL_CONTEXT)
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yield d
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self.assertIs(current_context(), SENTINEL_CONTEXT)
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@defer.inlineCallbacks
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def test_does_not_cache_exceptions(self):
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"""Checks that, if the callback throws an exception, it is called again
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for the next request.
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"""
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called = [False]
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def cb():
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if called[0]:
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# return a valid result the second time
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return defer.succeed(self.mock_http_response)
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called[0] = True
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raise Exception("boo")
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with LoggingContext("test") as test_context:
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try:
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yield self.cache.fetch_or_execute(self.mock_key, cb)
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except Exception as e:
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self.assertEqual(e.args[0], "boo")
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self.assertIs(current_context(), test_context)
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res = yield self.cache.fetch_or_execute(self.mock_key, cb)
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self.assertEqual(res, self.mock_http_response)
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self.assertIs(current_context(), test_context)
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@defer.inlineCallbacks
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def test_does_not_cache_failures(self):
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"""Checks that, if the callback returns a failure, it is called again
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for the next request.
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"""
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called = [False]
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def cb():
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if called[0]:
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# return a valid result the second time
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return defer.succeed(self.mock_http_response)
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called[0] = True
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return defer.fail(Exception("boo"))
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with LoggingContext("test") as test_context:
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try:
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yield self.cache.fetch_or_execute(self.mock_key, cb)
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except Exception as e:
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self.assertEqual(e.args[0], "boo")
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self.assertIs(current_context(), test_context)
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res = yield self.cache.fetch_or_execute(self.mock_key, cb)
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self.assertEqual(res, self.mock_http_response)
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self.assertIs(current_context(), test_context)
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@defer.inlineCallbacks
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def test_cleans_up(self):
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cb = Mock(return_value=make_awaitable(self.mock_http_response))
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yield self.cache.fetch_or_execute(self.mock_key, cb, "an arg")
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# should NOT have cleaned up yet
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self.clock.advance_time_msec(CLEANUP_PERIOD_MS / 2)
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yield self.cache.fetch_or_execute(self.mock_key, cb, "an arg")
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# still using cache
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cb.assert_called_once_with("an arg")
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self.clock.advance_time_msec(CLEANUP_PERIOD_MS)
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yield self.cache.fetch_or_execute(self.mock_key, cb, "an arg")
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# no longer using cache
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self.assertEqual(cb.call_count, 2)
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self.assertEqual(cb.call_args_list, [call("an arg"), call("an arg")])
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