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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
from typing import List, Tuple
from prometheus_client import Gauge
from twisted.internet import defer
from synapse.logging.context import make_deferred_yieldable
from synapse.util.batching_queue import (
BatchingQueue,
number_in_flight,
number_of_keys,
number_queued,
)
from tests.server import get_clock
from tests.unittest import TestCase
class BatchingQueueTestCase(TestCase):
def setUp(self) -> None:
self.clock, hs_clock = get_clock()
# We ensure that we remove any existing metrics for "test_queue".
try:
number_queued.remove("test_queue")
number_of_keys.remove("test_queue")
number_in_flight.remove("test_queue")
except KeyError:
pass
self._pending_calls: List[Tuple[List[str], defer.Deferred]] = []
self.queue: BatchingQueue[str, str] = BatchingQueue(
"test_queue", hs_clock, self._process_queue
)
async def _process_queue(self, values: List[str]) -> str:
d: "defer.Deferred[str]" = defer.Deferred()
self._pending_calls.append((values, d))
return await make_deferred_yieldable(d)
def _get_sample_with_name(self, metric: Gauge, name: str) -> float:
"""For a prometheus metric get the value of the sample that has a
matching "name" label.
"""
for sample in next(iter(metric.collect())).samples:
if sample.labels.get("name") == name:
return sample.value
self.fail("Found no matching sample")
def _assert_metrics(self, queued: int, keys: int, in_flight: int) -> None:
"""Assert that the metrics are correct"""
sample = self._get_sample_with_name(number_queued, self.queue._name)
self.assertEqual(
sample,
queued,
"number_queued",
)
sample = self._get_sample_with_name(number_of_keys, self.queue._name)
self.assertEqual(sample, keys, "number_of_keys")
sample = self._get_sample_with_name(number_in_flight, self.queue._name)
self.assertEqual(
sample,
in_flight,
"number_in_flight",
)
def test_simple(self) -> None:
"""Tests the basic case of calling `add_to_queue` once and having
`_process_queue` return.
"""
self.assertFalse(self._pending_calls)
queue_d = defer.ensureDeferred(self.queue.add_to_queue("foo"))
self._assert_metrics(queued=1, keys=1, in_flight=1)
# The queue should wait a reactor tick before calling the processing
# function.
self.assertFalse(self._pending_calls)
self.assertFalse(queue_d.called)
# We should see a call to `_process_queue` after a reactor tick.
self.clock.pump([0])
self.assertEqual(len(self._pending_calls), 1)
self.assertEqual(self._pending_calls[0][0], ["foo"])
self.assertFalse(queue_d.called)
self._assert_metrics(queued=0, keys=0, in_flight=1)
# Return value of the `_process_queue` should be propagated back.
self._pending_calls.pop()[1].callback("bar")
self.assertEqual(self.successResultOf(queue_d), "bar")
self._assert_metrics(queued=0, keys=0, in_flight=0)
def test_batching(self) -> None:
"""Test that multiple calls at the same time get batched up into one
call to `_process_queue`.
"""
self.assertFalse(self._pending_calls)
queue_d1 = defer.ensureDeferred(self.queue.add_to_queue("foo1"))
queue_d2 = defer.ensureDeferred(self.queue.add_to_queue("foo2"))
self._assert_metrics(queued=2, keys=1, in_flight=2)
self.clock.pump([0])
# We should see only *one* call to `_process_queue`
self.assertEqual(len(self._pending_calls), 1)
self.assertEqual(self._pending_calls[0][0], ["foo1", "foo2"])
self.assertFalse(queue_d1.called)
self.assertFalse(queue_d2.called)
self._assert_metrics(queued=0, keys=0, in_flight=2)
# Return value of the `_process_queue` should be propagated back to both.
self._pending_calls.pop()[1].callback("bar")
self.assertEqual(self.successResultOf(queue_d1), "bar")
self.assertEqual(self.successResultOf(queue_d2), "bar")
self._assert_metrics(queued=0, keys=0, in_flight=0)
def test_queuing(self) -> None:
"""Test that we queue up requests while a `_process_queue` is being
called.
"""
self.assertFalse(self._pending_calls)
queue_d1 = defer.ensureDeferred(self.queue.add_to_queue("foo1"))
self.clock.pump([0])
self.assertEqual(len(self._pending_calls), 1)
# We queue up work after the process function has been called, testing
# that they get correctly queued up.
queue_d2 = defer.ensureDeferred(self.queue.add_to_queue("foo2"))
queue_d3 = defer.ensureDeferred(self.queue.add_to_queue("foo3"))
# We should see only *one* call to `_process_queue`
self.assertEqual(len(self._pending_calls), 1)
self.assertEqual(self._pending_calls[0][0], ["foo1"])
self.assertFalse(queue_d1.called)
self.assertFalse(queue_d2.called)
self.assertFalse(queue_d3.called)
self._assert_metrics(queued=2, keys=1, in_flight=3)
# Return value of the `_process_queue` should be propagated back to the
# first.
self._pending_calls.pop()[1].callback("bar1")
self.assertEqual(self.successResultOf(queue_d1), "bar1")
self.assertFalse(queue_d2.called)
self.assertFalse(queue_d3.called)
self._assert_metrics(queued=2, keys=1, in_flight=2)
# We should now see a second call to `_process_queue`
self.clock.pump([0])
self.assertEqual(len(self._pending_calls), 1)
self.assertEqual(self._pending_calls[0][0], ["foo2", "foo3"])
self.assertFalse(queue_d2.called)
self.assertFalse(queue_d3.called)
self._assert_metrics(queued=0, keys=0, in_flight=2)
# Return value of the `_process_queue` should be propagated back to the
# second.
self._pending_calls.pop()[1].callback("bar2")
self.assertEqual(self.successResultOf(queue_d2), "bar2")
self.assertEqual(self.successResultOf(queue_d3), "bar2")
self._assert_metrics(queued=0, keys=0, in_flight=0)
def test_different_keys(self) -> None:
"""Test that calls to different keys get processed in parallel."""
self.assertFalse(self._pending_calls)
queue_d1 = defer.ensureDeferred(self.queue.add_to_queue("foo1", key=1))
self.clock.pump([0])
queue_d2 = defer.ensureDeferred(self.queue.add_to_queue("foo2", key=2))
self.clock.pump([0])
# We queue up another item with key=2 to check that we will keep taking
# things off the queue.
queue_d3 = defer.ensureDeferred(self.queue.add_to_queue("foo3", key=2))
# We should see two calls to `_process_queue`
self.assertEqual(len(self._pending_calls), 2)
self.assertEqual(self._pending_calls[0][0], ["foo1"])
self.assertEqual(self._pending_calls[1][0], ["foo2"])
self.assertFalse(queue_d1.called)
self.assertFalse(queue_d2.called)
self.assertFalse(queue_d3.called)
self._assert_metrics(queued=1, keys=1, in_flight=3)
# Return value of the `_process_queue` should be propagated back to the
# first.
self._pending_calls.pop(0)[1].callback("bar1")
self.assertEqual(self.successResultOf(queue_d1), "bar1")
self.assertFalse(queue_d2.called)
self.assertFalse(queue_d3.called)
self._assert_metrics(queued=1, keys=1, in_flight=2)
# Return value of the `_process_queue` should be propagated back to the
# second.
self._pending_calls.pop()[1].callback("bar2")
self.assertEqual(self.successResultOf(queue_d2), "bar2")
self.assertFalse(queue_d3.called)
# We should now see a call `_pending_calls` for `foo3`
self.clock.pump([0])
self.assertEqual(len(self._pending_calls), 1)
self.assertEqual(self._pending_calls[0][0], ["foo3"])
self.assertFalse(queue_d3.called)
self._assert_metrics(queued=0, keys=0, in_flight=1)
# Return value of the `_process_queue` should be propagated back to the
# third deferred.
self._pending_calls.pop()[1].callback("bar4")
self.assertEqual(self.successResultOf(queue_d3), "bar4")
self._assert_metrics(queued=0, keys=0, in_flight=0)
|
