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