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During the migration the automated script to update the copyright headers accidentally got rid of some of the existing copyright lines. Reinstate them.
287 lines
9.4 KiB
Python
287 lines
9.4 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright 2020 The Matrix.org Foundation C.I.C.
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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from functools import partial
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from typing import List, Tuple
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from twisted.internet import defer
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from synapse.util.caches.deferred_cache import DeferredCache
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from tests.unittest import TestCase
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class DeferredCacheTestCase(TestCase):
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def test_empty(self) -> None:
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cache: DeferredCache[str, int] = DeferredCache("test")
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with self.assertRaises(KeyError):
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cache.get("foo")
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def test_hit(self) -> None:
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cache: DeferredCache[str, int] = DeferredCache("test")
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cache.prefill("foo", 123)
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self.assertEqual(self.successResultOf(cache.get("foo")), 123)
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def test_hit_deferred(self) -> None:
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cache: DeferredCache[str, int] = DeferredCache("test")
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origin_d: "defer.Deferred[int]" = defer.Deferred()
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set_d = cache.set("k1", origin_d)
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# get should return an incomplete deferred
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get_d = cache.get("k1")
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self.assertFalse(get_d.called)
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# add a callback that will make sure that the set_d gets called before the get_d
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def check1(r: str) -> str:
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self.assertTrue(set_d.called)
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return r
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get_d.addCallback(check1)
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# now fire off all the deferreds
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origin_d.callback(99)
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self.assertEqual(self.successResultOf(origin_d), 99)
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self.assertEqual(self.successResultOf(set_d), 99)
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self.assertEqual(self.successResultOf(get_d), 99)
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def test_callbacks(self) -> None:
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"""Invalidation callbacks are called at the right time"""
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cache: DeferredCache[str, int] = DeferredCache("test")
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callbacks = set()
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# start with an entry, with a callback
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cache.prefill("k1", 10, callback=lambda: callbacks.add("prefill"))
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# now replace that entry with a pending result
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origin_d: "defer.Deferred[int]" = defer.Deferred()
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set_d = cache.set("k1", origin_d, callback=lambda: callbacks.add("set"))
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# ... and also make a get request
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get_d = cache.get("k1", callback=lambda: callbacks.add("get"))
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# we don't expect the invalidation callback for the original value to have
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# been called yet, even though get() will now return a different result.
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# I'm not sure if that is by design or not.
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self.assertEqual(callbacks, set())
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# now fire off all the deferreds
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origin_d.callback(20)
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self.assertEqual(self.successResultOf(set_d), 20)
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self.assertEqual(self.successResultOf(get_d), 20)
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# now the original invalidation callback should have been called, but none of
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# the others
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self.assertEqual(callbacks, {"prefill"})
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callbacks.clear()
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# another update should invalidate both the previous results
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cache.prefill("k1", 30)
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self.assertEqual(callbacks, {"set", "get"})
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def test_set_fail(self) -> None:
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cache: DeferredCache[str, int] = DeferredCache("test")
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callbacks = set()
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# start with an entry, with a callback
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cache.prefill("k1", 10, callback=lambda: callbacks.add("prefill"))
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# now replace that entry with a pending result
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origin_d: defer.Deferred = defer.Deferred()
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set_d = cache.set("k1", origin_d, callback=lambda: callbacks.add("set"))
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# ... and also make a get request
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get_d = cache.get("k1", callback=lambda: callbacks.add("get"))
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# none of the callbacks should have been called yet
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self.assertEqual(callbacks, set())
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# oh noes! fails!
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e = Exception("oops")
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origin_d.errback(e)
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self.assertIs(self.failureResultOf(set_d, Exception).value, e)
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self.assertIs(self.failureResultOf(get_d, Exception).value, e)
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# the callbacks for the failed requests should have been called.
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# I'm not sure if this is deliberate or not.
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self.assertEqual(callbacks, {"get", "set"})
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callbacks.clear()
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# the old value should still be returned now?
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get_d2 = cache.get("k1", callback=lambda: callbacks.add("get2"))
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self.assertEqual(self.successResultOf(get_d2), 10)
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# replacing the value now should run the callbacks for those requests
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# which got the original result
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cache.prefill("k1", 30)
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self.assertEqual(callbacks, {"prefill", "get2"})
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def test_get_immediate(self) -> None:
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cache: DeferredCache[str, int] = DeferredCache("test")
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d1: "defer.Deferred[int]" = defer.Deferred()
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cache.set("key1", d1)
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# get_immediate should return default
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v = cache.get_immediate("key1", 1)
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self.assertEqual(v, 1)
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# now complete the set
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d1.callback(2)
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# get_immediate should return result
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v = cache.get_immediate("key1", 1)
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self.assertEqual(v, 2)
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def test_invalidate(self) -> None:
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cache: DeferredCache[Tuple[str], int] = DeferredCache("test")
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cache.prefill(("foo",), 123)
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cache.invalidate(("foo",))
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with self.assertRaises(KeyError):
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cache.get(("foo",))
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def test_invalidate_all(self) -> None:
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cache: DeferredCache[str, str] = DeferredCache("testcache")
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callback_record = [False, False]
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def record_callback(idx: int) -> None:
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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[str]" = defer.Deferred()
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cache.set("key1", d1, partial(record_callback, 0))
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d2: "defer.Deferred[str]" = defer.Deferred()
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cache.set("key2", d2, partial(record_callback, 1))
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# lookup should return pending deferreds
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self.assertFalse(cache.get("key1").called)
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self.assertFalse(cache.get("key2").called)
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# let one of the lookups complete
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d2.callback("result2")
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# now the cache will return a completed deferred
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self.assertEqual(self.successResultOf(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 fail
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with self.assertRaises(KeyError):
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cache.get("key1")
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with self.assertRaises(KeyError):
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cache.get("key2")
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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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with self.assertRaises(KeyError):
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cache.get("key1", None)
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def test_eviction(self) -> None:
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cache: DeferredCache[int, str] = DeferredCache(
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"test", max_entries=2, apply_cache_factor_from_config=False
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)
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cache.prefill(1, "one")
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cache.prefill(2, "two")
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cache.prefill(3, "three") # 1 will be evicted
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with self.assertRaises(KeyError):
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cache.get(1)
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cache.get(2)
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cache.get(3)
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def test_eviction_lru(self) -> None:
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cache: DeferredCache[int, str] = DeferredCache(
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"test", max_entries=2, apply_cache_factor_from_config=False
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)
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cache.prefill(1, "one")
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cache.prefill(2, "two")
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# Now access 1 again, thus causing 2 to be least-recently used
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cache.get(1)
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cache.prefill(3, "three")
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with self.assertRaises(KeyError):
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cache.get(2)
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cache.get(1)
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cache.get(3)
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def test_eviction_iterable(self) -> None:
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cache: DeferredCache[int, List[str]] = DeferredCache(
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"test",
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max_entries=3,
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apply_cache_factor_from_config=False,
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iterable=True,
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)
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cache.prefill(1, ["one", "two"])
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cache.prefill(2, ["three"])
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# Now access 1 again, thus causing 2 to be least-recently used
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cache.get(1)
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# Now add an item to the cache, which evicts 2.
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cache.prefill(3, ["four"])
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with self.assertRaises(KeyError):
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cache.get(2)
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# Ensure 1 & 3 are in the cache.
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cache.get(1)
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cache.get(3)
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# Now access 1 again, thus causing 3 to be least-recently used
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cache.get(1)
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# Now add an item with multiple elements to the cache
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cache.prefill(4, ["five", "six"])
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# Both 1 and 3 are evicted since there's too many elements.
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with self.assertRaises(KeyError):
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cache.get(1)
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with self.assertRaises(KeyError):
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cache.get(3)
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# Now add another item to fill the cache again.
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cache.prefill(5, ["seven"])
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# Now access 4, thus causing 5 to be least-recently used
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cache.get(4)
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# Add an empty item.
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cache.prefill(6, [])
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# 5 gets evicted and replaced since an empty element counts as an item.
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with self.assertRaises(KeyError):
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cache.get(5)
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cache.get(4)
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cache.get(6)
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