245 lines
9.0 KiB
Python
245 lines
9.0 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 typing import List, Tuple
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from prometheus_client import Gauge
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from twisted.internet import defer
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from synapse.logging.context import make_deferred_yieldable
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from synapse.util.batching_queue import (
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BatchingQueue,
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number_in_flight,
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number_of_keys,
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number_queued,
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)
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from tests.server import get_clock
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from tests.unittest import TestCase
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class BatchingQueueTestCase(TestCase):
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def setUp(self) -> None:
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self.clock, hs_clock = get_clock()
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# We ensure that we remove any existing metrics for "test_queue".
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try:
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number_queued.remove("test_queue")
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number_of_keys.remove("test_queue")
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number_in_flight.remove("test_queue")
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except KeyError:
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pass
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self._pending_calls: List[Tuple[List[str], defer.Deferred]] = []
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self.queue: BatchingQueue[str, str] = BatchingQueue(
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"test_queue", hs_clock, self._process_queue
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)
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async def _process_queue(self, values: List[str]) -> str:
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d: "defer.Deferred[str]" = defer.Deferred()
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self._pending_calls.append((values, d))
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return await make_deferred_yieldable(d)
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def _get_sample_with_name(self, metric: Gauge, name: str) -> float:
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"""For a prometheus metric get the value of the sample that has a
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matching "name" label.
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"""
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for sample in next(iter(metric.collect())).samples:
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if sample.labels.get("name") == name:
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return sample.value
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self.fail("Found no matching sample")
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def _assert_metrics(self, queued: int, keys: int, in_flight: int) -> None:
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"""Assert that the metrics are correct"""
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sample = self._get_sample_with_name(number_queued, self.queue._name)
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self.assertEqual(
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sample,
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queued,
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"number_queued",
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)
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sample = self._get_sample_with_name(number_of_keys, self.queue._name)
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self.assertEqual(sample, keys, "number_of_keys")
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sample = self._get_sample_with_name(number_in_flight, self.queue._name)
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self.assertEqual(
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sample,
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in_flight,
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"number_in_flight",
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)
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def test_simple(self) -> None:
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"""Tests the basic case of calling `add_to_queue` once and having
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`_process_queue` return.
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"""
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self.assertFalse(self._pending_calls)
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queue_d = defer.ensureDeferred(self.queue.add_to_queue("foo"))
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self._assert_metrics(queued=1, keys=1, in_flight=1)
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# The queue should wait a reactor tick before calling the processing
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# function.
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self.assertFalse(self._pending_calls)
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self.assertFalse(queue_d.called)
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# We should see a call to `_process_queue` after a reactor tick.
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self.clock.pump([0])
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self.assertEqual(len(self._pending_calls), 1)
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self.assertEqual(self._pending_calls[0][0], ["foo"])
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self.assertFalse(queue_d.called)
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self._assert_metrics(queued=0, keys=0, in_flight=1)
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# Return value of the `_process_queue` should be propagated back.
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self._pending_calls.pop()[1].callback("bar")
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self.assertEqual(self.successResultOf(queue_d), "bar")
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self._assert_metrics(queued=0, keys=0, in_flight=0)
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def test_batching(self) -> None:
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"""Test that multiple calls at the same time get batched up into one
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call to `_process_queue`.
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"""
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self.assertFalse(self._pending_calls)
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queue_d1 = defer.ensureDeferred(self.queue.add_to_queue("foo1"))
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queue_d2 = defer.ensureDeferred(self.queue.add_to_queue("foo2"))
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self._assert_metrics(queued=2, keys=1, in_flight=2)
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self.clock.pump([0])
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# We should see only *one* call to `_process_queue`
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self.assertEqual(len(self._pending_calls), 1)
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self.assertEqual(self._pending_calls[0][0], ["foo1", "foo2"])
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self.assertFalse(queue_d1.called)
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self.assertFalse(queue_d2.called)
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self._assert_metrics(queued=0, keys=0, in_flight=2)
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# Return value of the `_process_queue` should be propagated back to both.
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self._pending_calls.pop()[1].callback("bar")
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self.assertEqual(self.successResultOf(queue_d1), "bar")
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self.assertEqual(self.successResultOf(queue_d2), "bar")
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self._assert_metrics(queued=0, keys=0, in_flight=0)
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def test_queuing(self) -> None:
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"""Test that we queue up requests while a `_process_queue` is being
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called.
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"""
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self.assertFalse(self._pending_calls)
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queue_d1 = defer.ensureDeferred(self.queue.add_to_queue("foo1"))
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self.clock.pump([0])
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self.assertEqual(len(self._pending_calls), 1)
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# We queue up work after the process function has been called, testing
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# that they get correctly queued up.
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queue_d2 = defer.ensureDeferred(self.queue.add_to_queue("foo2"))
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queue_d3 = defer.ensureDeferred(self.queue.add_to_queue("foo3"))
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# We should see only *one* call to `_process_queue`
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self.assertEqual(len(self._pending_calls), 1)
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self.assertEqual(self._pending_calls[0][0], ["foo1"])
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self.assertFalse(queue_d1.called)
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self.assertFalse(queue_d2.called)
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self.assertFalse(queue_d3.called)
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self._assert_metrics(queued=2, keys=1, in_flight=3)
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# Return value of the `_process_queue` should be propagated back to the
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# first.
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self._pending_calls.pop()[1].callback("bar1")
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self.assertEqual(self.successResultOf(queue_d1), "bar1")
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self.assertFalse(queue_d2.called)
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self.assertFalse(queue_d3.called)
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self._assert_metrics(queued=2, keys=1, in_flight=2)
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# We should now see a second call to `_process_queue`
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self.clock.pump([0])
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self.assertEqual(len(self._pending_calls), 1)
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self.assertEqual(self._pending_calls[0][0], ["foo2", "foo3"])
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self.assertFalse(queue_d2.called)
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self.assertFalse(queue_d3.called)
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self._assert_metrics(queued=0, keys=0, in_flight=2)
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# Return value of the `_process_queue` should be propagated back to the
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# second.
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self._pending_calls.pop()[1].callback("bar2")
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self.assertEqual(self.successResultOf(queue_d2), "bar2")
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self.assertEqual(self.successResultOf(queue_d3), "bar2")
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self._assert_metrics(queued=0, keys=0, in_flight=0)
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def test_different_keys(self) -> None:
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"""Test that calls to different keys get processed in parallel."""
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self.assertFalse(self._pending_calls)
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queue_d1 = defer.ensureDeferred(self.queue.add_to_queue("foo1", key=1))
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self.clock.pump([0])
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queue_d2 = defer.ensureDeferred(self.queue.add_to_queue("foo2", key=2))
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self.clock.pump([0])
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# We queue up another item with key=2 to check that we will keep taking
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# things off the queue.
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queue_d3 = defer.ensureDeferred(self.queue.add_to_queue("foo3", key=2))
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# We should see two calls to `_process_queue`
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self.assertEqual(len(self._pending_calls), 2)
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self.assertEqual(self._pending_calls[0][0], ["foo1"])
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self.assertEqual(self._pending_calls[1][0], ["foo2"])
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self.assertFalse(queue_d1.called)
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self.assertFalse(queue_d2.called)
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self.assertFalse(queue_d3.called)
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self._assert_metrics(queued=1, keys=1, in_flight=3)
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# Return value of the `_process_queue` should be propagated back to the
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# first.
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self._pending_calls.pop(0)[1].callback("bar1")
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self.assertEqual(self.successResultOf(queue_d1), "bar1")
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self.assertFalse(queue_d2.called)
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self.assertFalse(queue_d3.called)
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self._assert_metrics(queued=1, keys=1, in_flight=2)
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# Return value of the `_process_queue` should be propagated back to the
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# second.
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self._pending_calls.pop()[1].callback("bar2")
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self.assertEqual(self.successResultOf(queue_d2), "bar2")
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self.assertFalse(queue_d3.called)
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# We should now see a call `_pending_calls` for `foo3`
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self.clock.pump([0])
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self.assertEqual(len(self._pending_calls), 1)
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self.assertEqual(self._pending_calls[0][0], ["foo3"])
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self.assertFalse(queue_d3.called)
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self._assert_metrics(queued=0, keys=0, in_flight=1)
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# Return value of the `_process_queue` should be propagated back to the
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# third deferred.
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self._pending_calls.pop()[1].callback("bar4")
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self.assertEqual(self.successResultOf(queue_d3), "bar4")
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self._assert_metrics(queued=0, keys=0, in_flight=0)
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