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f36434590c
I was trying to understand how `cachedList` works, and ended up writing this extra test. I figure we may as well keep it.
789 lines
23 KiB
Python
789 lines
23 KiB
Python
# Copyright 2016 OpenMarket Ltd
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# Copyright 2018 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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import logging
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from typing import Set
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from unittest import mock
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from twisted.internet import defer, reactor
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from twisted.internet.defer import Deferred
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from synapse.api.errors import SynapseError
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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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make_deferred_yieldable,
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)
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from synapse.util.caches import descriptors
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from synapse.util.caches.descriptors import cached, lru_cache
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from tests import unittest
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from tests.test_utils import get_awaitable_result
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logger = logging.getLogger(__name__)
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class LruCacheDecoratorTestCase(unittest.TestCase):
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def test_base(self):
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class Cls:
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def __init__(self):
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self.mock = mock.Mock()
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@lru_cache()
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def fn(self, arg1, arg2):
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return self.mock(arg1, arg2)
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obj = Cls()
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obj.mock.return_value = "fish"
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r = obj.fn(1, 2)
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self.assertEqual(r, "fish")
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obj.mock.assert_called_once_with(1, 2)
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obj.mock.reset_mock()
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# a call with different params should call the mock again
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obj.mock.return_value = "chips"
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r = obj.fn(1, 3)
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self.assertEqual(r, "chips")
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obj.mock.assert_called_once_with(1, 3)
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obj.mock.reset_mock()
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# the two values should now be cached
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r = obj.fn(1, 2)
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self.assertEqual(r, "fish")
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r = obj.fn(1, 3)
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self.assertEqual(r, "chips")
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obj.mock.assert_not_called()
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def run_on_reactor():
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d = defer.Deferred()
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reactor.callLater(0, d.callback, 0)
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return make_deferred_yieldable(d)
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class DescriptorTestCase(unittest.TestCase):
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@defer.inlineCallbacks
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def test_cache(self):
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class Cls:
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def __init__(self):
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self.mock = mock.Mock()
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@descriptors.cached()
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def fn(self, arg1, arg2):
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return self.mock(arg1, arg2)
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obj = Cls()
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obj.mock.return_value = "fish"
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r = yield obj.fn(1, 2)
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self.assertEqual(r, "fish")
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obj.mock.assert_called_once_with(1, 2)
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obj.mock.reset_mock()
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# a call with different params should call the mock again
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obj.mock.return_value = "chips"
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r = yield obj.fn(1, 3)
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self.assertEqual(r, "chips")
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obj.mock.assert_called_once_with(1, 3)
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obj.mock.reset_mock()
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# the two values should now be cached
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r = yield obj.fn(1, 2)
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self.assertEqual(r, "fish")
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r = yield obj.fn(1, 3)
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self.assertEqual(r, "chips")
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obj.mock.assert_not_called()
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@defer.inlineCallbacks
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def test_cache_num_args(self):
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"""Only the first num_args arguments should matter to the cache"""
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class Cls:
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def __init__(self):
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self.mock = mock.Mock()
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@descriptors.cached(num_args=1)
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def fn(self, arg1, arg2):
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return self.mock(arg1, arg2)
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obj = Cls()
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obj.mock.return_value = "fish"
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r = yield obj.fn(1, 2)
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self.assertEqual(r, "fish")
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obj.mock.assert_called_once_with(1, 2)
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obj.mock.reset_mock()
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# a call with different params should call the mock again
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obj.mock.return_value = "chips"
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r = yield obj.fn(2, 3)
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self.assertEqual(r, "chips")
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obj.mock.assert_called_once_with(2, 3)
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obj.mock.reset_mock()
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# the two values should now be cached; we should be able to vary
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# the second argument and still get the cached result.
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r = yield obj.fn(1, 4)
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self.assertEqual(r, "fish")
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r = yield obj.fn(2, 5)
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self.assertEqual(r, "chips")
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obj.mock.assert_not_called()
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def test_cache_with_sync_exception(self):
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"""If the wrapped function throws synchronously, things should continue to work"""
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class Cls:
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@cached()
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def fn(self, arg1):
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raise SynapseError(100, "mai spoon iz too big!!1")
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obj = Cls()
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# this should fail immediately
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d = obj.fn(1)
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self.failureResultOf(d, SynapseError)
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# ... leaving the cache empty
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self.assertEqual(len(obj.fn.cache.cache), 0)
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# and a second call should result in a second exception
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d = obj.fn(1)
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self.failureResultOf(d, SynapseError)
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def test_cache_with_async_exception(self):
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"""The wrapped function returns a failure"""
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class Cls:
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result = None
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call_count = 0
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@cached()
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def fn(self, arg1):
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self.call_count += 1
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return self.result
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obj = Cls()
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callbacks: Set[str] = set()
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# set off an asynchronous request
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obj.result = origin_d = defer.Deferred()
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d1 = obj.fn(1, on_invalidate=lambda: callbacks.add("d1"))
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self.assertFalse(d1.called)
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# a second request should also return a deferred, but should not call the
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# function itself.
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d2 = obj.fn(1, on_invalidate=lambda: callbacks.add("d2"))
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self.assertFalse(d2.called)
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self.assertEqual(obj.call_count, 1)
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# no callbacks yet
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self.assertEqual(callbacks, set())
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# the original request fails
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e = Exception("bzz")
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origin_d.errback(e)
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# ... which should cause the lookups to fail similarly
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self.assertIs(self.failureResultOf(d1, Exception).value, e)
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self.assertIs(self.failureResultOf(d2, Exception).value, e)
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# ... and the callbacks to have been, uh, called.
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self.assertEqual(callbacks, {"d1", "d2"})
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# ... leaving the cache empty
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self.assertEqual(len(obj.fn.cache.cache), 0)
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# and a second call should work as normal
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obj.result = defer.succeed(100)
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d3 = obj.fn(1)
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self.assertEqual(self.successResultOf(d3), 100)
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self.assertEqual(obj.call_count, 2)
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def test_cache_logcontexts(self):
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"""Check that logcontexts are set and restored correctly when
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using the cache."""
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complete_lookup = defer.Deferred()
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class Cls:
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@descriptors.cached()
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def fn(self, arg1):
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@defer.inlineCallbacks
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def inner_fn():
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with PreserveLoggingContext():
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yield complete_lookup
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return 1
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return inner_fn()
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@defer.inlineCallbacks
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def do_lookup():
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with LoggingContext("c1") as c1:
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r = yield obj.fn(1)
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self.assertEqual(current_context(), c1)
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return r
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def check_result(r):
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self.assertEqual(r, 1)
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obj = Cls()
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# set off a deferred which will do a cache lookup
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d1 = do_lookup()
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self.assertEqual(current_context(), SENTINEL_CONTEXT)
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d1.addCallback(check_result)
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# and another
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d2 = do_lookup()
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self.assertEqual(current_context(), SENTINEL_CONTEXT)
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d2.addCallback(check_result)
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# let the lookup complete
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complete_lookup.callback(None)
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return defer.gatherResults([d1, d2])
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def test_cache_logcontexts_with_exception(self):
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"""Check that the cache sets and restores logcontexts correctly when
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the lookup function throws an exception"""
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class Cls:
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@descriptors.cached()
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def fn(self, arg1):
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@defer.inlineCallbacks
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def inner_fn():
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# we want this to behave like an asynchronous function
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yield run_on_reactor()
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raise SynapseError(400, "blah")
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return inner_fn()
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@defer.inlineCallbacks
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def do_lookup():
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with LoggingContext("c1") as c1:
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try:
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d = obj.fn(1)
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self.assertEqual(
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current_context(),
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SENTINEL_CONTEXT,
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)
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yield d
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self.fail("No exception thrown")
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except SynapseError:
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pass
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self.assertEqual(current_context(), c1)
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# the cache should now be empty
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self.assertEqual(len(obj.fn.cache.cache), 0)
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obj = Cls()
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# set off a deferred which will do a cache lookup
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d1 = do_lookup()
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self.assertEqual(current_context(), SENTINEL_CONTEXT)
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return d1
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@defer.inlineCallbacks
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def test_cache_default_args(self):
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class Cls:
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def __init__(self):
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self.mock = mock.Mock()
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@descriptors.cached()
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def fn(self, arg1, arg2=2, arg3=3):
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return self.mock(arg1, arg2, arg3)
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obj = Cls()
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obj.mock.return_value = "fish"
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r = yield obj.fn(1, 2, 3)
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self.assertEqual(r, "fish")
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obj.mock.assert_called_once_with(1, 2, 3)
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obj.mock.reset_mock()
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# a call with same params shouldn't call the mock again
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r = yield obj.fn(1, 2)
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self.assertEqual(r, "fish")
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obj.mock.assert_not_called()
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obj.mock.reset_mock()
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# a call with different params should call the mock again
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obj.mock.return_value = "chips"
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r = yield obj.fn(2, 3)
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self.assertEqual(r, "chips")
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obj.mock.assert_called_once_with(2, 3, 3)
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obj.mock.reset_mock()
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# the two values should now be cached
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r = yield obj.fn(1, 2)
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self.assertEqual(r, "fish")
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r = yield obj.fn(2, 3)
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self.assertEqual(r, "chips")
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obj.mock.assert_not_called()
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def test_cache_iterable(self):
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class Cls:
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def __init__(self):
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self.mock = mock.Mock()
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@descriptors.cached(iterable=True)
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def fn(self, arg1, arg2):
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return self.mock(arg1, arg2)
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obj = Cls()
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obj.mock.return_value = ["spam", "eggs"]
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r = obj.fn(1, 2)
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self.assertEqual(r.result, ["spam", "eggs"])
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obj.mock.assert_called_once_with(1, 2)
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obj.mock.reset_mock()
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# a call with different params should call the mock again
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obj.mock.return_value = ["chips"]
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r = obj.fn(1, 3)
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self.assertEqual(r.result, ["chips"])
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obj.mock.assert_called_once_with(1, 3)
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obj.mock.reset_mock()
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# the two values should now be cached
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self.assertEqual(len(obj.fn.cache.cache), 3)
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r = obj.fn(1, 2)
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self.assertEqual(r.result, ["spam", "eggs"])
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r = obj.fn(1, 3)
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self.assertEqual(r.result, ["chips"])
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obj.mock.assert_not_called()
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def test_cache_iterable_with_sync_exception(self):
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"""If the wrapped function throws synchronously, things should continue to work"""
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class Cls:
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@descriptors.cached(iterable=True)
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def fn(self, arg1):
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raise SynapseError(100, "mai spoon iz too big!!1")
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obj = Cls()
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# this should fail immediately
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d = obj.fn(1)
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self.failureResultOf(d, SynapseError)
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# ... leaving the cache empty
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self.assertEqual(len(obj.fn.cache.cache), 0)
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# and a second call should result in a second exception
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d = obj.fn(1)
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self.failureResultOf(d, SynapseError)
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def test_invalidate_cascade(self):
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"""Invalidations should cascade up through cache contexts"""
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class Cls:
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@cached(cache_context=True)
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async def func1(self, key, cache_context):
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return await self.func2(key, on_invalidate=cache_context.invalidate)
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@cached(cache_context=True)
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async def func2(self, key, cache_context):
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return self.func3(key, on_invalidate=cache_context.invalidate)
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@lru_cache(cache_context=True)
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def func3(self, key, cache_context):
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self.invalidate = cache_context.invalidate
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return 42
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obj = Cls()
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top_invalidate = mock.Mock()
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r = get_awaitable_result(obj.func1("k1", on_invalidate=top_invalidate))
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self.assertEqual(r, 42)
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obj.invalidate()
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top_invalidate.assert_called_once()
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class CacheDecoratorTestCase(unittest.HomeserverTestCase):
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"""More tests for @cached
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The following is a set of tests that got lost in a different file for a while.
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There are probably duplicates of the tests in DescriptorTestCase. Ideally the
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duplicates would be removed and the two sets of classes combined.
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"""
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@defer.inlineCallbacks
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def test_passthrough(self):
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class A:
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@cached()
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def func(self, key):
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return key
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a = A()
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self.assertEquals((yield a.func("foo")), "foo")
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self.assertEquals((yield a.func("bar")), "bar")
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@defer.inlineCallbacks
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def test_hit(self):
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callcount = [0]
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class A:
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@cached()
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def func(self, key):
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callcount[0] += 1
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return key
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a = A()
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yield a.func("foo")
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self.assertEquals(callcount[0], 1)
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self.assertEquals((yield a.func("foo")), "foo")
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self.assertEquals(callcount[0], 1)
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@defer.inlineCallbacks
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def test_invalidate(self):
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callcount = [0]
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class A:
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@cached()
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def func(self, key):
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callcount[0] += 1
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return key
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a = A()
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yield a.func("foo")
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self.assertEquals(callcount[0], 1)
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a.func.invalidate(("foo",))
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yield a.func("foo")
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self.assertEquals(callcount[0], 2)
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def test_invalidate_missing(self):
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class A:
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@cached()
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def func(self, key):
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return key
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A().func.invalidate(("what",))
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@defer.inlineCallbacks
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def test_max_entries(self):
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callcount = [0]
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class A:
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@cached(max_entries=10)
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def func(self, key):
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callcount[0] += 1
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return key
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a = A()
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for k in range(0, 12):
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yield a.func(k)
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self.assertEquals(callcount[0], 12)
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# There must have been at least 2 evictions, meaning if we calculate
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# all 12 values again, we must get called at least 2 more times
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for k in range(0, 12):
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yield a.func(k)
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self.assertTrue(
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callcount[0] >= 14, msg="Expected callcount >= 14, got %d" % (callcount[0])
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)
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def test_prefill(self):
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callcount = [0]
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d = defer.succeed(123)
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class A:
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@cached()
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def func(self, key):
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callcount[0] += 1
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return d
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a = A()
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a.func.prefill(("foo",), 456)
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self.assertEquals(a.func("foo").result, 456)
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self.assertEquals(callcount[0], 0)
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@defer.inlineCallbacks
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def test_invalidate_context(self):
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callcount = [0]
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callcount2 = [0]
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class A:
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@cached()
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def func(self, key):
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callcount[0] += 1
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return key
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@cached(cache_context=True)
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def func2(self, key, cache_context):
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callcount2[0] += 1
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return self.func(key, on_invalidate=cache_context.invalidate)
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a = A()
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yield a.func2("foo")
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self.assertEquals(callcount[0], 1)
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self.assertEquals(callcount2[0], 1)
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a.func.invalidate(("foo",))
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yield a.func("foo")
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self.assertEquals(callcount[0], 2)
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self.assertEquals(callcount2[0], 1)
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yield a.func2("foo")
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|
|
self.assertEquals(callcount[0], 2)
|
|
self.assertEquals(callcount2[0], 2)
|
|
|
|
@defer.inlineCallbacks
|
|
def test_eviction_context(self):
|
|
callcount = [0]
|
|
callcount2 = [0]
|
|
|
|
class A:
|
|
@cached(max_entries=2)
|
|
def func(self, key):
|
|
callcount[0] += 1
|
|
return key
|
|
|
|
@cached(cache_context=True)
|
|
def func2(self, key, cache_context):
|
|
callcount2[0] += 1
|
|
return self.func(key, on_invalidate=cache_context.invalidate)
|
|
|
|
a = A()
|
|
yield a.func2("foo")
|
|
yield a.func2("foo2")
|
|
|
|
self.assertEquals(callcount[0], 2)
|
|
self.assertEquals(callcount2[0], 2)
|
|
|
|
yield a.func2("foo")
|
|
self.assertEquals(callcount[0], 2)
|
|
self.assertEquals(callcount2[0], 2)
|
|
|
|
yield a.func("foo3")
|
|
|
|
self.assertEquals(callcount[0], 3)
|
|
self.assertEquals(callcount2[0], 2)
|
|
|
|
yield a.func2("foo")
|
|
|
|
self.assertEquals(callcount[0], 4)
|
|
self.assertEquals(callcount2[0], 3)
|
|
|
|
@defer.inlineCallbacks
|
|
def test_double_get(self):
|
|
callcount = [0]
|
|
callcount2 = [0]
|
|
|
|
class A:
|
|
@cached()
|
|
def func(self, key):
|
|
callcount[0] += 1
|
|
return key
|
|
|
|
@cached(cache_context=True)
|
|
def func2(self, key, cache_context):
|
|
callcount2[0] += 1
|
|
return self.func(key, on_invalidate=cache_context.invalidate)
|
|
|
|
a = A()
|
|
a.func2.cache.cache = mock.Mock(wraps=a.func2.cache.cache)
|
|
|
|
yield a.func2("foo")
|
|
|
|
self.assertEquals(callcount[0], 1)
|
|
self.assertEquals(callcount2[0], 1)
|
|
|
|
a.func2.invalidate(("foo",))
|
|
self.assertEquals(a.func2.cache.cache.del_multi.call_count, 1)
|
|
|
|
yield a.func2("foo")
|
|
a.func2.invalidate(("foo",))
|
|
self.assertEquals(a.func2.cache.cache.del_multi.call_count, 2)
|
|
|
|
self.assertEquals(callcount[0], 1)
|
|
self.assertEquals(callcount2[0], 2)
|
|
|
|
a.func.invalidate(("foo",))
|
|
self.assertEquals(a.func2.cache.cache.del_multi.call_count, 3)
|
|
yield a.func("foo")
|
|
|
|
self.assertEquals(callcount[0], 2)
|
|
self.assertEquals(callcount2[0], 2)
|
|
|
|
yield a.func2("foo")
|
|
|
|
self.assertEquals(callcount[0], 2)
|
|
self.assertEquals(callcount2[0], 3)
|
|
|
|
|
|
class CachedListDescriptorTestCase(unittest.TestCase):
|
|
@defer.inlineCallbacks
|
|
def test_cache(self):
|
|
class Cls:
|
|
def __init__(self):
|
|
self.mock = mock.Mock()
|
|
|
|
@descriptors.cached()
|
|
def fn(self, arg1, arg2):
|
|
pass
|
|
|
|
@descriptors.cachedList("fn", "args1")
|
|
async def list_fn(self, args1, arg2):
|
|
assert current_context().name == "c1"
|
|
# we want this to behave like an asynchronous function
|
|
await run_on_reactor()
|
|
assert current_context().name == "c1"
|
|
return self.mock(args1, arg2)
|
|
|
|
with LoggingContext("c1") as c1:
|
|
obj = Cls()
|
|
obj.mock.return_value = {10: "fish", 20: "chips"}
|
|
|
|
# start the lookup off
|
|
d1 = obj.list_fn([10, 20], 2)
|
|
self.assertEqual(current_context(), SENTINEL_CONTEXT)
|
|
r = yield d1
|
|
self.assertEqual(current_context(), c1)
|
|
obj.mock.assert_called_once_with((10, 20), 2)
|
|
self.assertEqual(r, {10: "fish", 20: "chips"})
|
|
obj.mock.reset_mock()
|
|
|
|
# a call with different params should call the mock again
|
|
obj.mock.return_value = {30: "peas"}
|
|
r = yield obj.list_fn([20, 30], 2)
|
|
obj.mock.assert_called_once_with((30,), 2)
|
|
self.assertEqual(r, {20: "chips", 30: "peas"})
|
|
obj.mock.reset_mock()
|
|
|
|
# all the values should now be cached
|
|
r = yield obj.fn(10, 2)
|
|
self.assertEqual(r, "fish")
|
|
r = yield obj.fn(20, 2)
|
|
self.assertEqual(r, "chips")
|
|
r = yield obj.fn(30, 2)
|
|
self.assertEqual(r, "peas")
|
|
r = yield obj.list_fn([10, 20, 30], 2)
|
|
obj.mock.assert_not_called()
|
|
self.assertEqual(r, {10: "fish", 20: "chips", 30: "peas"})
|
|
|
|
# we should also be able to use a (single-use) iterable, and should
|
|
# deduplicate the keys
|
|
obj.mock.reset_mock()
|
|
obj.mock.return_value = {40: "gravy"}
|
|
iterable = (x for x in [10, 40, 40])
|
|
r = yield obj.list_fn(iterable, 2)
|
|
obj.mock.assert_called_once_with((40,), 2)
|
|
self.assertEqual(r, {10: "fish", 40: "gravy"})
|
|
|
|
def test_concurrent_lookups(self):
|
|
"""All concurrent lookups should get the same result"""
|
|
|
|
class Cls:
|
|
def __init__(self):
|
|
self.mock = mock.Mock()
|
|
|
|
@descriptors.cached()
|
|
def fn(self, arg1):
|
|
pass
|
|
|
|
@descriptors.cachedList("fn", "args1")
|
|
def list_fn(self, args1) -> "Deferred[dict]":
|
|
return self.mock(args1)
|
|
|
|
obj = Cls()
|
|
deferred_result = Deferred()
|
|
obj.mock.return_value = deferred_result
|
|
|
|
# start off several concurrent lookups of the same key
|
|
d1 = obj.list_fn([10])
|
|
d2 = obj.list_fn([10])
|
|
d3 = obj.list_fn([10])
|
|
|
|
# the mock should have been called exactly once
|
|
obj.mock.assert_called_once_with((10,))
|
|
obj.mock.reset_mock()
|
|
|
|
# ... and none of the calls should yet be complete
|
|
self.assertFalse(d1.called)
|
|
self.assertFalse(d2.called)
|
|
self.assertFalse(d3.called)
|
|
|
|
# complete the lookup. @cachedList functions need to complete with a map
|
|
# of input->result
|
|
deferred_result.callback({10: "peas"})
|
|
|
|
# ... which should give the right result to all the callers
|
|
self.assertEqual(self.successResultOf(d1), {10: "peas"})
|
|
self.assertEqual(self.successResultOf(d2), {10: "peas"})
|
|
self.assertEqual(self.successResultOf(d3), {10: "peas"})
|
|
|
|
@defer.inlineCallbacks
|
|
def test_invalidate(self):
|
|
"""Make sure that invalidation callbacks are called."""
|
|
|
|
class Cls:
|
|
def __init__(self):
|
|
self.mock = mock.Mock()
|
|
|
|
@descriptors.cached()
|
|
def fn(self, arg1, arg2):
|
|
pass
|
|
|
|
@descriptors.cachedList("fn", "args1")
|
|
async def list_fn(self, args1, arg2):
|
|
# we want this to behave like an asynchronous function
|
|
await run_on_reactor()
|
|
return self.mock(args1, arg2)
|
|
|
|
obj = Cls()
|
|
invalidate0 = mock.Mock()
|
|
invalidate1 = mock.Mock()
|
|
|
|
# cache miss
|
|
obj.mock.return_value = {10: "fish", 20: "chips"}
|
|
r1 = yield obj.list_fn([10, 20], 2, on_invalidate=invalidate0)
|
|
obj.mock.assert_called_once_with((10, 20), 2)
|
|
self.assertEqual(r1, {10: "fish", 20: "chips"})
|
|
obj.mock.reset_mock()
|
|
|
|
# cache hit
|
|
r2 = yield obj.list_fn([10, 20], 2, on_invalidate=invalidate1)
|
|
obj.mock.assert_not_called()
|
|
self.assertEqual(r2, {10: "fish", 20: "chips"})
|
|
|
|
invalidate0.assert_not_called()
|
|
invalidate1.assert_not_called()
|
|
|
|
# now if we invalidate the keys, both invalidations should get called
|
|
obj.fn.invalidate((10, 2))
|
|
invalidate0.assert_called_once()
|
|
invalidate1.assert_called_once()
|