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Fix up BatchingQueue (#10078)

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Fixes #10068
This commit is contained in:
Erik Johnston 2021-05-27 14:32:31 +01:00 • committed by GitHub
parent d9f44fd0b9
commit 78b5102ae7
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3 changed files with 125 additions and 24 deletions
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78
tests/util/test_batching_queue.py
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@ -14,7 +14,12 @@
from twisted.internet import defer
from synapse.logging.context import make_deferred_yieldable
from synapse.util.batching_queue import BatchingQueue
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
@ -24,6 +29,14 @@ class BatchingQueueTestCase(TestCase):
def setUp(self):
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 = []
self.queue = BatchingQueue("test_queue", hs_clock, self._process_queue)
@ -32,6 +45,41 @@ class BatchingQueueTestCase(TestCase):
self._pending_calls.append((values, d))
return await make_deferred_yieldable(d)
def _assert_metrics(self, queued, keys, in_flight):
"""Assert that the metrics are correct"""
self.assertEqual(len(number_queued.collect()), 1)
self.assertEqual(len(number_queued.collect()[0].samples), 1)
self.assertEqual(
number_queued.collect()[0].samples[0].labels,
{"name": self.queue._name},
)
self.assertEqual(
number_queued.collect()[0].samples[0].value,
queued,
"number_queued",
)
self.assertEqual(len(number_of_keys.collect()), 1)
self.assertEqual(len(number_of_keys.collect()[0].samples), 1)
self.assertEqual(
number_queued.collect()[0].samples[0].labels, {"name": self.queue._name}
)
self.assertEqual(
number_of_keys.collect()[0].samples[0].value, keys, "number_of_keys"
)
self.assertEqual(len(number_in_flight.collect()), 1)
self.assertEqual(len(number_in_flight.collect()[0].samples), 1)
self.assertEqual(
number_queued.collect()[0].samples[0].labels, {"name": self.queue._name}
)
self.assertEqual(
number_in_flight.collect()[0].samples[0].value,
in_flight,
"number_in_flight",
)
def test_simple(self):
"""Tests the basic case of calling `add_to_queue` once and having
`_process_queue` return.
@ -41,6 +89,8 @@ class BatchingQueueTestCase(TestCase):
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)
@ -52,12 +102,15 @@ class BatchingQueueTestCase(TestCase):
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):
"""Test that multiple calls at the same time get batched up into one
call to `_process_queue`.
@ -68,6 +121,8 @@ class BatchingQueueTestCase(TestCase):
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`
@ -75,12 +130,14 @@ class BatchingQueueTestCase(TestCase):
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):
"""Test that we queue up requests while a `_process_queue` is being
@ -92,13 +149,20 @@ class BatchingQueueTestCase(TestCase):
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.
@ -106,18 +170,24 @@ class BatchingQueueTestCase(TestCase):
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"])
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):
"""Test that calls to different keys get processed in parallel."""
@ -140,6 +210,7 @@ class BatchingQueueTestCase(TestCase):
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.
@ -148,6 +219,7 @@ class BatchingQueueTestCase(TestCase):
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.
@ -161,9 +233,11 @@ class BatchingQueueTestCase(TestCase):
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)