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Add more tests for in-flight state query duplication. (#12033)
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changelog.d/12033.misc
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changelog.d/12033.misc
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@ -0,0 +1 @@
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Deduplicate in-flight requests in `_get_state_for_groups`.
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@ -18,8 +18,9 @@ from unittest.mock import patch
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from twisted.internet.defer import Deferred, ensureDeferred
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from twisted.test.proto_helpers import MemoryReactor
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from synapse.api.constants import EventTypes
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from synapse.storage.state import StateFilter
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from synapse.types import MutableStateMap, StateMap
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from synapse.types import StateMap
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from synapse.util import Clock
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from tests.unittest import HomeserverTestCase
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@ -27,6 +28,21 @@ from tests.unittest import HomeserverTestCase
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if typing.TYPE_CHECKING:
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from synapse.server import HomeServer
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# StateFilter for ALL non-m.room.member state events
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ALL_NON_MEMBERS_STATE_FILTER = StateFilter.freeze(
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types={EventTypes.Member: set()},
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include_others=True,
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)
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FAKE_STATE = {
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(EventTypes.Member, "@alice:test"): "join",
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(EventTypes.Member, "@bob:test"): "leave",
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(EventTypes.Member, "@charlie:test"): "invite",
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("test.type", "a"): "AAA",
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("test.type", "b"): "BBB",
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("other.event.type", "state.key"): "123",
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}
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class StateGroupInflightCachingTestCase(HomeserverTestCase):
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def prepare(
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@ -65,24 +81,8 @@ class StateGroupInflightCachingTestCase(HomeserverTestCase):
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Assemble a fake database response and complete the database request.
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"""
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result: Dict[int, StateMap[str]] = {}
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for group in groups:
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group_result: MutableStateMap[str] = {}
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result[group] = group_result
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for state_type, state_keys in state_filter.types.items():
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if state_keys is None:
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group_result[(state_type, "a")] = "xyz"
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group_result[(state_type, "b")] = "xyz"
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else:
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for state_key in state_keys:
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group_result[(state_type, state_key)] = "abc"
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if state_filter.include_others:
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group_result[("other.event.type", "state.key")] = "123"
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d.callback(result)
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# Return a filtered copy of the fake state
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d.callback({group: state_filter.filter_state(FAKE_STATE) for group in groups})
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def test_duplicate_requests_deduplicated(self) -> None:
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"""
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@ -125,9 +125,159 @@ class StateGroupInflightCachingTestCase(HomeserverTestCase):
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# Now we can complete the request
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self._complete_request_fake(groups, sf, d)
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self.assertEqual(
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self.get_success(req1), {("other.event.type", "state.key"): "123"}
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self.assertEqual(self.get_success(req1), FAKE_STATE)
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self.assertEqual(self.get_success(req2), FAKE_STATE)
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def test_smaller_request_deduplicated(self) -> None:
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"""
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Tests that duplicate requests for state are deduplicated.
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This test:
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- requests some state (state group 42, 'all' state filter)
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- requests a subset of that state, before the first request finishes
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- checks to see that only one database query was made
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- completes the database query
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- checks that both requests see the correct retrieved state
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"""
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req1 = ensureDeferred(
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self.state_datastore._get_state_for_group_using_inflight_cache(
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42, StateFilter.from_types((("test.type", None),))
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)
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)
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self.assertEqual(
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self.get_success(req2), {("other.event.type", "state.key"): "123"}
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self.pump(by=0.1)
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# This should have gone to the database
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self.assertEqual(len(self.get_state_group_calls), 1)
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self.assertFalse(req1.called)
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req2 = ensureDeferred(
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self.state_datastore._get_state_for_group_using_inflight_cache(
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42, StateFilter.from_types((("test.type", "b"),))
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)
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)
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self.pump(by=0.1)
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# No more calls should have gone to the database, because the second
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# request was already in the in-flight cache!
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self.assertEqual(len(self.get_state_group_calls), 1)
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self.assertFalse(req1.called)
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self.assertFalse(req2.called)
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groups, sf, d = self.get_state_group_calls[0]
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self.assertEqual(groups, (42,))
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# The state filter is expanded internally for increased cache hit rate,
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# so we the database sees a wider state filter than requested.
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self.assertEqual(sf, ALL_NON_MEMBERS_STATE_FILTER)
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# Now we can complete the request
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self._complete_request_fake(groups, sf, d)
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self.assertEqual(
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self.get_success(req1),
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{("test.type", "a"): "AAA", ("test.type", "b"): "BBB"},
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)
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self.assertEqual(self.get_success(req2), {("test.type", "b"): "BBB"})
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def test_partially_overlapping_request_deduplicated(self) -> None:
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"""
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Tests that partially-overlapping requests are partially deduplicated.
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This test:
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- requests a single type of wildcard state
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(This is internally expanded to be all non-member state)
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- requests the entire state in parallel
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- checks to see that two database queries were made, but that the second
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one is only for member state.
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- completes the database queries
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- checks that both requests have the correct result.
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"""
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req1 = ensureDeferred(
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self.state_datastore._get_state_for_group_using_inflight_cache(
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42, StateFilter.from_types((("test.type", None),))
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)
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)
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self.pump(by=0.1)
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# This should have gone to the database
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self.assertEqual(len(self.get_state_group_calls), 1)
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self.assertFalse(req1.called)
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req2 = ensureDeferred(
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self.state_datastore._get_state_for_group_using_inflight_cache(
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42, StateFilter.all()
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)
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)
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self.pump(by=0.1)
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# Because it only partially overlaps, this also went to the database
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self.assertEqual(len(self.get_state_group_calls), 2)
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self.assertFalse(req1.called)
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self.assertFalse(req2.called)
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# First request:
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groups, sf, d = self.get_state_group_calls[0]
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self.assertEqual(groups, (42,))
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# The state filter is expanded internally for increased cache hit rate,
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# so we the database sees a wider state filter than requested.
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self.assertEqual(sf, ALL_NON_MEMBERS_STATE_FILTER)
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self._complete_request_fake(groups, sf, d)
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# Second request:
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groups, sf, d = self.get_state_group_calls[1]
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self.assertEqual(groups, (42,))
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# The state filter is narrowed to only request membership state, because
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# the remainder of the state is already being queried in the first request!
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self.assertEqual(
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sf, StateFilter.freeze({EventTypes.Member: None}, include_others=False)
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)
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self._complete_request_fake(groups, sf, d)
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# Check the results are correct
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self.assertEqual(
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self.get_success(req1),
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{("test.type", "a"): "AAA", ("test.type", "b"): "BBB"},
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)
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self.assertEqual(self.get_success(req2), FAKE_STATE)
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def test_in_flight_requests_stop_being_in_flight(self) -> None:
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"""
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Tests that in-flight request deduplication doesn't somehow 'hold on'
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to completed requests: once they're done, they're taken out of the
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in-flight cache.
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"""
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req1 = ensureDeferred(
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self.state_datastore._get_state_for_group_using_inflight_cache(
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42, StateFilter.all()
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)
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)
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self.pump(by=0.1)
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# This should have gone to the database
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self.assertEqual(len(self.get_state_group_calls), 1)
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self.assertFalse(req1.called)
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# Complete the request right away.
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self._complete_request_fake(*self.get_state_group_calls[0])
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self.assertTrue(req1.called)
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# Send off another request
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req2 = ensureDeferred(
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self.state_datastore._get_state_for_group_using_inflight_cache(
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42, StateFilter.all()
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)
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)
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self.pump(by=0.1)
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# It should have gone to the database again, because the previous request
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# isn't in-flight and therefore isn't available for deduplication.
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self.assertEqual(len(self.get_state_group_calls), 2)
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self.assertFalse(req2.called)
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# Complete the request right away.
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self._complete_request_fake(*self.get_state_group_calls[1])
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self.assertTrue(req2.called)
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groups, sf, d = self.get_state_group_calls[0]
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self.assertEqual(self.get_success(req1), FAKE_STATE)
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self.assertEqual(self.get_success(req2), FAKE_STATE)
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