114 lines
4 KiB
Python
114 lines
4 KiB
Python
# Copyright 2021 The Matrix.org Foundation C.I.C.
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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 synapse.server import HomeServer
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from synapse.storage.databases.main.lock import _LOCK_TIMEOUT_MS
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from tests import unittest
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class LockTestCase(unittest.HomeserverTestCase):
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def prepare(self, reactor, clock, hs: HomeServer):
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self.store = hs.get_datastore()
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def test_simple_lock(self):
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"""Test that we can take out a lock and that while we hold it nobody
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else can take it out.
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"""
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# First to acquire this lock, so it should complete
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lock = self.get_success(self.store.try_acquire_lock("name", "key"))
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self.assertIsNotNone(lock)
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# Enter the context manager
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self.get_success(lock.__aenter__())
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# Attempting to acquire the lock again fails.
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lock2 = self.get_success(self.store.try_acquire_lock("name", "key"))
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self.assertIsNone(lock2)
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# Calling `is_still_valid` reports true.
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self.assertTrue(self.get_success(lock.is_still_valid()))
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# Drop the lock
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self.get_success(lock.__aexit__(None, None, None))
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# We can now acquire the lock again.
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lock3 = self.get_success(self.store.try_acquire_lock("name", "key"))
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self.assertIsNotNone(lock3)
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self.get_success(lock3.__aenter__())
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self.get_success(lock3.__aexit__(None, None, None))
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def test_maintain_lock(self):
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"""Test that we don't time out locks while they're still active"""
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lock = self.get_success(self.store.try_acquire_lock("name", "key"))
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self.assertIsNotNone(lock)
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self.get_success(lock.__aenter__())
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# Wait for ages with the lock, we should not be able to get the lock.
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self.reactor.advance(5 * _LOCK_TIMEOUT_MS / 1000)
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lock2 = self.get_success(self.store.try_acquire_lock("name", "key"))
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self.assertIsNone(lock2)
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self.get_success(lock.__aexit__(None, None, None))
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def test_timeout_lock(self):
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"""Test that we time out locks if they're not updated for ages"""
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lock = self.get_success(self.store.try_acquire_lock("name", "key"))
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self.assertIsNotNone(lock)
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self.get_success(lock.__aenter__())
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# We simulate the process getting stuck by cancelling the looping call
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# that keeps the lock active.
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lock._looping_call.stop()
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# Wait for the lock to timeout.
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self.reactor.advance(2 * _LOCK_TIMEOUT_MS / 1000)
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lock2 = self.get_success(self.store.try_acquire_lock("name", "key"))
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self.assertIsNotNone(lock2)
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self.assertFalse(self.get_success(lock.is_still_valid()))
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def test_drop(self):
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"""Test that dropping the context manager means we stop renewing the lock"""
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lock = self.get_success(self.store.try_acquire_lock("name", "key"))
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self.assertIsNotNone(lock)
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del lock
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# Wait for the lock to timeout.
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self.reactor.advance(2 * _LOCK_TIMEOUT_MS / 1000)
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lock2 = self.get_success(self.store.try_acquire_lock("name", "key"))
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self.assertIsNotNone(lock2)
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def test_shutdown(self):
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"""Test that shutting down Synapse releases the locks"""
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# Acquire two locks
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lock = self.get_success(self.store.try_acquire_lock("name", "key1"))
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self.assertIsNotNone(lock)
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lock2 = self.get_success(self.store.try_acquire_lock("name", "key2"))
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self.assertIsNotNone(lock2)
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# Now call the shutdown code
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self.get_success(self.store._on_shutdown())
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self.assertEqual(self.store._live_tokens, {})
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