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450 lines
15 KiB
Python
450 lines
15 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 twisted.internet import defer, reactor
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from twisted.internet.base import ReactorBase
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from twisted.internet.defer import Deferred
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from twisted.test.proto_helpers import MemoryReactor
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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 synapse.util import Clock
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from tests import unittest
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class LockTestCase(unittest.HomeserverTestCase):
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def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
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self.store = hs.get_datastores().main
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def test_acquire_contention(self) -> None:
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# Track the number of tasks holding the lock.
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# Should be at most 1.
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in_lock = 0
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max_in_lock = 0
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release_lock: "Deferred[None]" = Deferred()
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async def task() -> None:
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nonlocal in_lock
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nonlocal max_in_lock
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lock = await self.store.try_acquire_lock("name", "key")
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if not lock:
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return
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async with lock:
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in_lock += 1
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max_in_lock = max(max_in_lock, in_lock)
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# Block to allow other tasks to attempt to take the lock.
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await release_lock
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in_lock -= 1
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# Start 3 tasks.
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task1 = defer.ensureDeferred(task())
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task2 = defer.ensureDeferred(task())
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task3 = defer.ensureDeferred(task())
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# Give the reactor a kick so that the database transaction returns.
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self.pump()
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release_lock.callback(None)
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# Run the tasks to completion.
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# To work around `Linearizer`s using a different reactor to sleep when
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# contended (#12841), we call `runUntilCurrent` on
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# `twisted.internet.reactor`, which is a different reactor to that used
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# by the homeserver.
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assert isinstance(reactor, ReactorBase)
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self.get_success(task1)
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reactor.runUntilCurrent()
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self.get_success(task2)
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reactor.runUntilCurrent()
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self.get_success(task3)
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# At most one task should have held the lock at a time.
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self.assertEqual(max_in_lock, 1)
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def test_simple_lock(self) -> None:
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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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assert lock is not None
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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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assert lock3 is not None
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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) -> None:
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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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assert lock is not None
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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) -> None:
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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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assert lock is not None
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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) -> None:
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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) -> None:
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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_lock_tokens, {})
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class ReadWriteLockTestCase(unittest.HomeserverTestCase):
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"""Test the read/write lock implementation."""
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def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
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self.store = hs.get_datastores().main
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def test_acquire_write_contention(self) -> None:
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"""Test that we can only acquire one write lock at a time"""
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# Track the number of tasks holding the lock.
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# Should be at most 1.
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in_lock = 0
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max_in_lock = 0
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release_lock: "Deferred[None]" = Deferred()
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async def task() -> None:
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nonlocal in_lock
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nonlocal max_in_lock
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lock = await self.store.try_acquire_read_write_lock(
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"name", "key", write=True
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)
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if not lock:
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return
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async with lock:
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in_lock += 1
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max_in_lock = max(max_in_lock, in_lock)
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# Block to allow other tasks to attempt to take the lock.
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await release_lock
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in_lock -= 1
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# Start 3 tasks.
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task1 = defer.ensureDeferred(task())
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task2 = defer.ensureDeferred(task())
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task3 = defer.ensureDeferred(task())
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# Give the reactor a kick so that the database transaction returns.
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self.pump()
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release_lock.callback(None)
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# Run the tasks to completion.
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# To work around `Linearizer`s using a different reactor to sleep when
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# contended (#12841), we call `runUntilCurrent` on
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# `twisted.internet.reactor`, which is a different reactor to that used
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# by the homeserver.
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assert isinstance(reactor, ReactorBase)
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self.get_success(task1)
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reactor.runUntilCurrent()
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self.get_success(task2)
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reactor.runUntilCurrent()
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self.get_success(task3)
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# At most one task should have held the lock at a time.
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self.assertEqual(max_in_lock, 1)
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def test_acquire_multiple_reads(self) -> None:
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"""Test that we can acquire multiple read locks at a time"""
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# Track the number of tasks holding the lock.
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in_lock = 0
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max_in_lock = 0
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release_lock: "Deferred[None]" = Deferred()
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async def task() -> None:
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nonlocal in_lock
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nonlocal max_in_lock
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lock = await self.store.try_acquire_read_write_lock(
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"name", "key", write=False
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)
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if not lock:
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return
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async with lock:
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in_lock += 1
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max_in_lock = max(max_in_lock, in_lock)
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# Block to allow other tasks to attempt to take the lock.
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await release_lock
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in_lock -= 1
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# Start 3 tasks.
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task1 = defer.ensureDeferred(task())
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task2 = defer.ensureDeferred(task())
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task3 = defer.ensureDeferred(task())
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# Give the reactor a kick so that the database transaction returns.
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self.pump()
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release_lock.callback(None)
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# Run the tasks to completion.
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# To work around `Linearizer`s using a different reactor to sleep when
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# contended (#12841), we call `runUntilCurrent` on
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# `twisted.internet.reactor`, which is a different reactor to that used
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# by the homeserver.
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assert isinstance(reactor, ReactorBase)
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self.get_success(task1)
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reactor.runUntilCurrent()
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self.get_success(task2)
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reactor.runUntilCurrent()
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self.get_success(task3)
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# At most one task should have held the lock at a time.
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self.assertEqual(max_in_lock, 3)
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def test_write_lock_acquired(self) -> None:
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"""Test that we can take out a write lock and that while we hold it
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nobody 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(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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assert lock is not None
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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, as both read and write.
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lock2 = self.get_success(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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self.assertIsNone(lock2)
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lock3 = self.get_success(
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self.store.try_acquire_read_write_lock("name", "key", write=False)
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)
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self.assertIsNone(lock3)
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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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lock4 = self.get_success(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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assert lock4 is not None
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self.get_success(lock4.__aenter__())
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self.get_success(lock4.__aexit__(None, None, None))
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def test_read_lock_acquired(self) -> None:
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"""Test that we can take out a read lock and that while we hold it
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only other reads can use it.
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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(
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self.store.try_acquire_read_write_lock("name", "key", write=False)
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)
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assert lock is not None
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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 write lock fails
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lock2 = self.get_success(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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self.assertIsNone(lock2)
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# Attempting to acquire a read lock succeeds
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lock3 = self.get_success(
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self.store.try_acquire_read_write_lock("name", "key", write=False)
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)
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assert lock3 is not None
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self.get_success(lock3.__aenter__())
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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 first lock
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self.get_success(lock.__aexit__(None, None, None))
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# Attempting to acquire the write lock still fails, as lock3 is still
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# active.
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lock4 = self.get_success(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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self.assertIsNone(lock4)
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# Drop the still open third lock
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self.get_success(lock3.__aexit__(None, None, None))
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# We can now acquire the lock again.
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lock5 = self.get_success(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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assert lock5 is not None
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self.get_success(lock5.__aenter__())
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self.get_success(lock5.__aexit__(None, None, None))
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def test_maintain_lock(self) -> None:
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"""Test that we don't time out locks while they're still active (lock is
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renewed in the background if the process is still alive)"""
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lock = self.get_success(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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assert lock is not None
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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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self.pump()
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lock2 = self.get_success(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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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) -> None:
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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(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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assert lock is not None
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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(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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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) -> None:
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"""Test that dropping the context manager means we stop renewing the lock"""
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lock = self.get_success(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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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(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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self.assertIsNotNone(lock2)
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def test_shutdown(self) -> None:
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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(
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self.store.try_acquire_read_write_lock("name", "key", write=True)
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)
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self.assertIsNotNone(lock)
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lock2 = self.get_success(
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self.store.try_acquire_read_write_lock("name", "key2", write=True)
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)
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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_read_write_lock_tokens, {})
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