448 lines
14 KiB
Python
448 lines
14 KiB
Python
# -*- coding: utf-8 -*-
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# 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 functools import partial
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import mock
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from twisted.internet import defer, reactor
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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
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from tests import unittest
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logger = logging.getLogger(__name__)
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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 CacheTestCase(unittest.TestCase):
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def test_invalidate_all(self):
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cache = descriptors.Cache("testcache")
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callback_record = [False, False]
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def record_callback(idx):
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callback_record[idx] = True
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# add a couple of pending entries
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d1 = defer.Deferred()
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cache.set("key1", d1, partial(record_callback, 0))
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d2 = defer.Deferred()
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cache.set("key2", d2, partial(record_callback, 1))
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# lookup should return observable deferreds
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self.assertFalse(cache.get("key1").has_called())
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self.assertFalse(cache.get("key2").has_called())
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# let one of the lookups complete
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d2.callback("result2")
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# for now at least, the cache will return real results rather than an
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# observabledeferred
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self.assertEqual(cache.get("key2"), "result2")
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# now do the invalidation
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cache.invalidate_all()
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# lookup should return none
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self.assertIsNone(cache.get("key1", None))
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self.assertIsNone(cache.get("key2", None))
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# both callbacks should have been callbacked
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self.assertTrue(callback_record[0], "Invalidation callback for key1 not called")
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self.assertTrue(callback_record[1], "Invalidation callback for key2 not called")
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# letting the other lookup complete should do nothing
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d1.callback("result1")
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self.assertIsNone(cache.get("key1", None))
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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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"""
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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_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() as c1:
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c1.name = "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() as c1:
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c1.name = "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(), 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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"""
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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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class CachedListDescriptorTestCase(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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pass
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@descriptors.cachedList("fn", "args1")
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async def list_fn(self, args1, arg2):
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assert current_context().request == "c1"
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# we want this to behave like an asynchronous function
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await run_on_reactor()
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assert current_context().request == "c1"
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return self.mock(args1, arg2)
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with LoggingContext() as c1:
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c1.request = "c1"
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obj = Cls()
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obj.mock.return_value = {10: "fish", 20: "chips"}
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d1 = obj.list_fn([10, 20], 2)
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self.assertEqual(current_context(), SENTINEL_CONTEXT)
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r = yield d1
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self.assertEqual(current_context(), c1)
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obj.mock.assert_called_once_with([10, 20], 2)
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self.assertEqual(r, {10: "fish", 20: "chips"})
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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 = {30: "peas"}
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r = yield obj.list_fn([20, 30], 2)
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obj.mock.assert_called_once_with([30], 2)
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self.assertEqual(r, {20: "chips", 30: "peas"})
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obj.mock.reset_mock()
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# all the values should now be cached
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r = yield obj.fn(10, 2)
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self.assertEqual(r, "fish")
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r = yield obj.fn(20, 2)
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self.assertEqual(r, "chips")
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r = yield obj.fn(30, 2)
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self.assertEqual(r, "peas")
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r = yield obj.list_fn([10, 20, 30], 2)
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obj.mock.assert_not_called()
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self.assertEqual(r, {10: "fish", 20: "chips", 30: "peas"})
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@defer.inlineCallbacks
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def test_invalidate(self):
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"""Make sure that invalidation callbacks are called."""
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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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pass
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@descriptors.cachedList("fn", "args1")
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async def list_fn(self, args1, arg2):
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# we want this to behave like an asynchronous function
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await run_on_reactor()
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return self.mock(args1, arg2)
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obj = Cls()
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invalidate0 = mock.Mock()
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invalidate1 = mock.Mock()
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# cache miss
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obj.mock.return_value = {10: "fish", 20: "chips"}
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r1 = yield obj.list_fn([10, 20], 2, on_invalidate=invalidate0)
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obj.mock.assert_called_once_with([10, 20], 2)
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self.assertEqual(r1, {10: "fish", 20: "chips"})
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obj.mock.reset_mock()
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# cache hit
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r2 = yield obj.list_fn([10, 20], 2, on_invalidate=invalidate1)
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obj.mock.assert_not_called()
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self.assertEqual(r2, {10: "fish", 20: "chips"})
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invalidate0.assert_not_called()
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invalidate1.assert_not_called()
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# now if we invalidate the keys, both invalidations should get called
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obj.fn.invalidate((10, 2))
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invalidate0.assert_called_once()
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invalidate1.assert_called_once()
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