mirror of
https://mau.dev/maunium/synapse.git
synced 2024-11-18 16:02:15 +01:00
3b754aea27
Ensure that we lock correctly to prevent multiple concurrent metadata load requests, and generally clean up the way we construct the metadata cache.
161 lines
5 KiB
Python
161 lines
5 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 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 unittest.mock import Mock
|
|
|
|
from twisted.internet import defer
|
|
from twisted.internet.defer import Deferred
|
|
|
|
from synapse.util.caches.cached_call import CachedCall, RetryOnExceptionCachedCall
|
|
|
|
from tests.test_utils import get_awaitable_result
|
|
from tests.unittest import TestCase
|
|
|
|
|
|
class CachedCallTestCase(TestCase):
|
|
def test_get(self):
|
|
"""
|
|
Happy-path test case: makes a couple of calls and makes sure they behave
|
|
correctly
|
|
"""
|
|
d = Deferred()
|
|
|
|
async def f():
|
|
return await d
|
|
|
|
slow_call = Mock(side_effect=f)
|
|
|
|
cached_call = CachedCall(slow_call)
|
|
|
|
# the mock should not yet have been called
|
|
slow_call.assert_not_called()
|
|
|
|
# now fire off a couple of calls
|
|
completed_results = []
|
|
|
|
async def r():
|
|
res = await cached_call.get()
|
|
completed_results.append(res)
|
|
|
|
r1 = defer.ensureDeferred(r())
|
|
r2 = defer.ensureDeferred(r())
|
|
|
|
# neither result should be complete yet
|
|
self.assertNoResult(r1)
|
|
self.assertNoResult(r2)
|
|
|
|
# and the mock should have been called *once*, with no params
|
|
slow_call.assert_called_once_with()
|
|
|
|
# allow the deferred to complete, which should complete both the pending results
|
|
d.callback(123)
|
|
self.assertEqual(completed_results, [123, 123])
|
|
self.successResultOf(r1)
|
|
self.successResultOf(r2)
|
|
|
|
# another call to the getter should complete immediately
|
|
slow_call.reset_mock()
|
|
r3 = get_awaitable_result(cached_call.get())
|
|
self.assertEqual(r3, 123)
|
|
slow_call.assert_not_called()
|
|
|
|
def test_fast_call(self):
|
|
"""
|
|
Test the behaviour when the underlying function completes immediately
|
|
"""
|
|
|
|
async def f():
|
|
return 12
|
|
|
|
fast_call = Mock(side_effect=f)
|
|
cached_call = CachedCall(fast_call)
|
|
|
|
# the mock should not yet have been called
|
|
fast_call.assert_not_called()
|
|
|
|
# run the call a couple of times, which should complete immediately
|
|
self.assertEqual(get_awaitable_result(cached_call.get()), 12)
|
|
self.assertEqual(get_awaitable_result(cached_call.get()), 12)
|
|
|
|
# the mock should have been called once
|
|
fast_call.assert_called_once_with()
|
|
|
|
|
|
class RetryOnExceptionCachedCallTestCase(TestCase):
|
|
def test_get(self):
|
|
# set up the RetryOnExceptionCachedCall around a function which will fail
|
|
# (after a while)
|
|
d = Deferred()
|
|
|
|
async def f1():
|
|
await d
|
|
raise ValueError("moo")
|
|
|
|
slow_call = Mock(side_effect=f1)
|
|
cached_call = RetryOnExceptionCachedCall(slow_call)
|
|
|
|
# the mock should not yet have been called
|
|
slow_call.assert_not_called()
|
|
|
|
# now fire off a couple of calls
|
|
completed_results = []
|
|
|
|
async def r():
|
|
try:
|
|
await cached_call.get()
|
|
except Exception as e1:
|
|
completed_results.append(e1)
|
|
|
|
r1 = defer.ensureDeferred(r())
|
|
r2 = defer.ensureDeferred(r())
|
|
|
|
# neither result should be complete yet
|
|
self.assertNoResult(r1)
|
|
self.assertNoResult(r2)
|
|
|
|
# and the mock should have been called *once*, with no params
|
|
slow_call.assert_called_once_with()
|
|
|
|
# complete the deferred, which should make the pending calls fail
|
|
d.callback(0)
|
|
self.assertEqual(len(completed_results), 2)
|
|
for e in completed_results:
|
|
self.assertIsInstance(e, ValueError)
|
|
self.assertEqual(e.args, ("moo",))
|
|
|
|
# reset the mock to return a successful result, and make another pair of calls
|
|
# to the getter
|
|
d = Deferred()
|
|
|
|
async def f2():
|
|
return await d
|
|
|
|
slow_call.reset_mock()
|
|
slow_call.side_effect = f2
|
|
r3 = defer.ensureDeferred(cached_call.get())
|
|
r4 = defer.ensureDeferred(cached_call.get())
|
|
|
|
self.assertNoResult(r3)
|
|
self.assertNoResult(r4)
|
|
slow_call.assert_called_once_with()
|
|
|
|
# let that call complete, and check the results
|
|
d.callback(123)
|
|
self.assertEqual(self.successResultOf(r3), 123)
|
|
self.assertEqual(self.successResultOf(r4), 123)
|
|
|
|
# and now more calls to the getter should complete immediately
|
|
slow_call.reset_mock()
|
|
self.assertEqual(get_awaitable_result(cached_call.get()), 123)
|
|
slow_call.assert_not_called()
|