1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
# Copyright 2021 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from synapse.server import HomeServer
from synapse.storage.databases.main.lock import _LOCK_TIMEOUT_MS
from tests import unittest
class LockTestCase(unittest.HomeserverTestCase):
def prepare(self, reactor, clock, hs: HomeServer):
self.store = hs.get_datastore()
def test_simple_lock(self):
"""Test that we can take out a lock and that while we hold it nobody
else can take it out.
"""
# First to acquire this lock, so it should complete
lock = self.get_success(self.store.try_acquire_lock("name", "key"))
self.assertIsNotNone(lock)
# Enter the context manager
self.get_success(lock.__aenter__())
# Attempting to acquire the lock again fails.
lock2 = self.get_success(self.store.try_acquire_lock("name", "key"))
self.assertIsNone(lock2)
# Calling `is_still_valid` reports true.
self.assertTrue(self.get_success(lock.is_still_valid()))
# Drop the lock
self.get_success(lock.__aexit__(None, None, None))
# We can now acquire the lock again.
lock3 = self.get_success(self.store.try_acquire_lock("name", "key"))
self.assertIsNotNone(lock3)
self.get_success(lock3.__aenter__())
self.get_success(lock3.__aexit__(None, None, None))
def test_maintain_lock(self):
"""Test that we don't time out locks while they're still active"""
lock = self.get_success(self.store.try_acquire_lock("name", "key"))
self.assertIsNotNone(lock)
self.get_success(lock.__aenter__())
# Wait for ages with the lock, we should not be able to get the lock.
self.reactor.advance(5 * _LOCK_TIMEOUT_MS / 1000)
lock2 = self.get_success(self.store.try_acquire_lock("name", "key"))
self.assertIsNone(lock2)
self.get_success(lock.__aexit__(None, None, None))
def test_timeout_lock(self):
"""Test that we time out locks if they're not updated for ages"""
lock = self.get_success(self.store.try_acquire_lock("name", "key"))
self.assertIsNotNone(lock)
self.get_success(lock.__aenter__())
# We simulate the process getting stuck by cancelling the looping call
# that keeps the lock active.
lock._looping_call.stop()
# Wait for the lock to timeout.
self.reactor.advance(2 * _LOCK_TIMEOUT_MS / 1000)
lock2 = self.get_success(self.store.try_acquire_lock("name", "key"))
self.assertIsNotNone(lock2)
self.assertFalse(self.get_success(lock.is_still_valid()))
def test_drop(self):
"""Test that dropping the context manager means we stop renewing the lock"""
lock = self.get_success(self.store.try_acquire_lock("name", "key"))
self.assertIsNotNone(lock)
del lock
# Wait for the lock to timeout.
self.reactor.advance(2 * _LOCK_TIMEOUT_MS / 1000)
lock2 = self.get_success(self.store.try_acquire_lock("name", "key"))
self.assertIsNotNone(lock2)
def test_shutdown(self):
"""Test that shutting down Synapse releases the locks"""
# Acquire two locks
lock = self.get_success(self.store.try_acquire_lock("name", "key1"))
self.assertIsNotNone(lock)
lock2 = self.get_success(self.store.try_acquire_lock("name", "key2"))
self.assertIsNotNone(lock2)
# Now call the shutdown code
self.get_success(self.store._on_shutdown())
self.assertEqual(self.store._live_tokens, {})
|
