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When all entries in an `LruCache` have a size of 0 according to the provided `size_callback`, and `drop_from_cache` is called on a cache node, the node would be unlinked from the LRU linked list but remain in the cache dictionary. An assertion would be later be tripped due to the inconsistency. Avoid unintentionally calling `__len__` and use a strict `is None` check instead when unwrapping the weak reference.
318 lines
9.4 KiB
Python
318 lines
9.4 KiB
Python
# Copyright 2015, 2016 OpenMarket 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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from typing import List
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from unittest.mock import Mock
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from synapse.util.caches.lrucache import LruCache, setup_expire_lru_cache_entries
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from synapse.util.caches.treecache import TreeCache
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from tests import unittest
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from tests.unittest import override_config
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class LruCacheTestCase(unittest.HomeserverTestCase):
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def test_get_set(self):
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cache = LruCache(1)
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cache["key"] = "value"
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self.assertEquals(cache.get("key"), "value")
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self.assertEquals(cache["key"], "value")
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def test_eviction(self):
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cache = LruCache(2)
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cache[1] = 1
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cache[2] = 2
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self.assertEquals(cache.get(1), 1)
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self.assertEquals(cache.get(2), 2)
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cache[3] = 3
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self.assertEquals(cache.get(1), None)
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self.assertEquals(cache.get(2), 2)
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self.assertEquals(cache.get(3), 3)
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def test_setdefault(self):
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cache = LruCache(1)
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self.assertEquals(cache.setdefault("key", 1), 1)
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self.assertEquals(cache.get("key"), 1)
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self.assertEquals(cache.setdefault("key", 2), 1)
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self.assertEquals(cache.get("key"), 1)
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cache["key"] = 2 # Make sure overriding works.
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self.assertEquals(cache.get("key"), 2)
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def test_pop(self):
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cache = LruCache(1)
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cache["key"] = 1
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self.assertEquals(cache.pop("key"), 1)
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self.assertEquals(cache.pop("key"), None)
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def test_del_multi(self):
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cache = LruCache(4, cache_type=TreeCache)
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cache[("animal", "cat")] = "mew"
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cache[("animal", "dog")] = "woof"
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cache[("vehicles", "car")] = "vroom"
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cache[("vehicles", "train")] = "chuff"
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self.assertEquals(len(cache), 4)
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self.assertEquals(cache.get(("animal", "cat")), "mew")
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self.assertEquals(cache.get(("vehicles", "car")), "vroom")
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cache.del_multi(("animal",))
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self.assertEquals(len(cache), 2)
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self.assertEquals(cache.get(("animal", "cat")), None)
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self.assertEquals(cache.get(("animal", "dog")), None)
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self.assertEquals(cache.get(("vehicles", "car")), "vroom")
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self.assertEquals(cache.get(("vehicles", "train")), "chuff")
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# Man from del_multi say "Yes".
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def test_clear(self):
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cache = LruCache(1)
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cache["key"] = 1
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cache.clear()
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self.assertEquals(len(cache), 0)
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@override_config({"caches": {"per_cache_factors": {"mycache": 10}}})
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def test_special_size(self):
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cache = LruCache(10, "mycache")
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self.assertEqual(cache.max_size, 100)
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class LruCacheCallbacksTestCase(unittest.HomeserverTestCase):
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def test_get(self):
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m = Mock()
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cache = LruCache(1)
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cache.set("key", "value")
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self.assertFalse(m.called)
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cache.get("key", callbacks=[m])
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self.assertFalse(m.called)
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cache.get("key", "value")
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self.assertFalse(m.called)
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cache.set("key", "value2")
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self.assertEquals(m.call_count, 1)
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cache.set("key", "value")
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self.assertEquals(m.call_count, 1)
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def test_multi_get(self):
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m = Mock()
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cache = LruCache(1)
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cache.set("key", "value")
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self.assertFalse(m.called)
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cache.get("key", callbacks=[m])
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self.assertFalse(m.called)
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cache.get("key", callbacks=[m])
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self.assertFalse(m.called)
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cache.set("key", "value2")
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self.assertEquals(m.call_count, 1)
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cache.set("key", "value")
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self.assertEquals(m.call_count, 1)
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def test_set(self):
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m = Mock()
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cache = LruCache(1)
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cache.set("key", "value", callbacks=[m])
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self.assertFalse(m.called)
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cache.set("key", "value")
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self.assertFalse(m.called)
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cache.set("key", "value2")
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self.assertEquals(m.call_count, 1)
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cache.set("key", "value")
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self.assertEquals(m.call_count, 1)
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def test_pop(self):
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m = Mock()
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cache = LruCache(1)
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cache.set("key", "value", callbacks=[m])
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self.assertFalse(m.called)
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cache.pop("key")
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self.assertEquals(m.call_count, 1)
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cache.set("key", "value")
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self.assertEquals(m.call_count, 1)
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cache.pop("key")
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self.assertEquals(m.call_count, 1)
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def test_del_multi(self):
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m1 = Mock()
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m2 = Mock()
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m3 = Mock()
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m4 = Mock()
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cache = LruCache(4, cache_type=TreeCache)
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cache.set(("a", "1"), "value", callbacks=[m1])
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cache.set(("a", "2"), "value", callbacks=[m2])
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cache.set(("b", "1"), "value", callbacks=[m3])
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cache.set(("b", "2"), "value", callbacks=[m4])
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self.assertEquals(m1.call_count, 0)
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self.assertEquals(m2.call_count, 0)
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self.assertEquals(m3.call_count, 0)
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self.assertEquals(m4.call_count, 0)
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cache.del_multi(("a",))
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self.assertEquals(m1.call_count, 1)
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self.assertEquals(m2.call_count, 1)
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self.assertEquals(m3.call_count, 0)
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self.assertEquals(m4.call_count, 0)
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def test_clear(self):
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m1 = Mock()
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m2 = Mock()
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cache = LruCache(5)
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cache.set("key1", "value", callbacks=[m1])
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cache.set("key2", "value", callbacks=[m2])
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self.assertEquals(m1.call_count, 0)
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self.assertEquals(m2.call_count, 0)
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cache.clear()
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self.assertEquals(m1.call_count, 1)
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self.assertEquals(m2.call_count, 1)
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def test_eviction(self):
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m1 = Mock(name="m1")
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m2 = Mock(name="m2")
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m3 = Mock(name="m3")
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cache = LruCache(2)
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cache.set("key1", "value", callbacks=[m1])
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cache.set("key2", "value", callbacks=[m2])
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self.assertEquals(m1.call_count, 0)
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self.assertEquals(m2.call_count, 0)
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self.assertEquals(m3.call_count, 0)
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cache.set("key3", "value", callbacks=[m3])
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self.assertEquals(m1.call_count, 1)
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self.assertEquals(m2.call_count, 0)
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self.assertEquals(m3.call_count, 0)
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cache.set("key3", "value")
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self.assertEquals(m1.call_count, 1)
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self.assertEquals(m2.call_count, 0)
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self.assertEquals(m3.call_count, 0)
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cache.get("key2")
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self.assertEquals(m1.call_count, 1)
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self.assertEquals(m2.call_count, 0)
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self.assertEquals(m3.call_count, 0)
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cache.set("key1", "value", callbacks=[m1])
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self.assertEquals(m1.call_count, 1)
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self.assertEquals(m2.call_count, 0)
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self.assertEquals(m3.call_count, 1)
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class LruCacheSizedTestCase(unittest.HomeserverTestCase):
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def test_evict(self):
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cache = LruCache(5, size_callback=len)
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cache["key1"] = [0]
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cache["key2"] = [1, 2]
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cache["key3"] = [3]
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cache["key4"] = [4]
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self.assertEquals(cache["key1"], [0])
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self.assertEquals(cache["key2"], [1, 2])
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self.assertEquals(cache["key3"], [3])
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self.assertEquals(cache["key4"], [4])
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self.assertEquals(len(cache), 5)
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cache["key5"] = [5, 6]
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self.assertEquals(len(cache), 4)
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self.assertEquals(cache.get("key1"), None)
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self.assertEquals(cache.get("key2"), None)
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self.assertEquals(cache["key3"], [3])
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self.assertEquals(cache["key4"], [4])
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self.assertEquals(cache["key5"], [5, 6])
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def test_zero_size_drop_from_cache(self) -> None:
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"""Test that `drop_from_cache` works correctly with 0-sized entries."""
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cache: LruCache[str, List[int]] = LruCache(5, size_callback=lambda x: 0)
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cache["key1"] = []
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self.assertEqual(len(cache), 0)
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cache.cache["key1"].drop_from_cache()
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self.assertIsNone(
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cache.pop("key1"), "Cache entry should have been evicted but wasn't"
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)
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class TimeEvictionTestCase(unittest.HomeserverTestCase):
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"""Test that time based eviction works correctly."""
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def default_config(self):
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config = super().default_config()
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config.setdefault("caches", {})["expiry_time"] = "30m"
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return config
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def test_evict(self):
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setup_expire_lru_cache_entries(self.hs)
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cache = LruCache(5, clock=self.hs.get_clock())
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# Check that we evict entries we haven't accessed for 30 minutes.
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cache["key1"] = 1
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cache["key2"] = 2
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self.reactor.advance(20 * 60)
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self.assertEqual(cache.get("key1"), 1)
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self.reactor.advance(20 * 60)
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# We have only touched `key1` in the last 30m, so we expect that to
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# still be in the cache while `key2` should have been evicted.
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self.assertEqual(cache.get("key1"), 1)
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self.assertEqual(cache.get("key2"), None)
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# Check that re-adding an expired key works correctly.
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cache["key2"] = 3
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self.assertEqual(cache.get("key2"), 3)
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self.reactor.advance(20 * 60)
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self.assertEqual(cache.get("key2"), 3)
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self.reactor.advance(20 * 60)
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self.assertEqual(cache.get("key1"), None)
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self.assertEqual(cache.get("key2"), 3)
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