497 lines
19 KiB
Python
497 lines
19 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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import json
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from contextlib import contextmanager
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from typing import Generator, List, Tuple
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from unittest import mock
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from twisted.enterprise.adbapi import ConnectionPool
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from twisted.internet.defer import CancelledError, Deferred, ensureDeferred
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from twisted.test.proto_helpers import MemoryReactor
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from synapse.api.room_versions import EventFormatVersions, RoomVersions
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from synapse.events import make_event_from_dict
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from synapse.logging.context import LoggingContext
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from synapse.rest import admin
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from synapse.rest.client import login, room
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from synapse.server import HomeServer
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from synapse.storage.databases.main.events_worker import (
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EVENT_QUEUE_THREADS,
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EventsWorkerStore,
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)
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from synapse.storage.types import Connection
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from synapse.util import Clock
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from synapse.util.async_helpers import yieldable_gather_results
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from tests import unittest
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from tests.test_utils.event_injection import create_event, inject_event
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class HaveSeenEventsTestCase(unittest.HomeserverTestCase):
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servlets = [
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admin.register_servlets,
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room.register_servlets,
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login.register_servlets,
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]
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def prepare(self, reactor, clock, hs):
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self.hs = hs
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self.store: EventsWorkerStore = hs.get_datastores().main
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self.user = self.register_user("user", "pass")
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self.token = self.login(self.user, "pass")
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self.room_id = self.helper.create_room_as(self.user, tok=self.token)
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self.event_ids: List[str] = []
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for i in range(3):
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event = self.get_success(
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inject_event(
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hs,
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room_version=RoomVersions.V7.identifier,
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room_id=self.room_id,
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sender=self.user,
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type="test_event_type",
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content={"body": f"foobarbaz{i}"},
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)
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)
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self.event_ids.append(event.event_id)
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def test_simple(self):
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with LoggingContext(name="test") as ctx:
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res = self.get_success(
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self.store.have_seen_events(
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self.room_id, [self.event_ids[0], "eventdoesnotexist"]
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)
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)
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self.assertEqual(res, {self.event_ids[0]})
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# that should result in a single db query
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self.assertEqual(ctx.get_resource_usage().db_txn_count, 1)
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# a second lookup of the same events should cause no queries
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with LoggingContext(name="test") as ctx:
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res = self.get_success(
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self.store.have_seen_events(
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self.room_id, [self.event_ids[0], "eventdoesnotexist"]
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)
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)
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self.assertEqual(res, {self.event_ids[0]})
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self.assertEqual(ctx.get_resource_usage().db_txn_count, 0)
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def test_query_via_event_cache(self):
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# fetch an event into the event cache
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self.get_success(self.store.get_event(self.event_ids[0]))
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# looking it up should now cause no db hits
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with LoggingContext(name="test") as ctx:
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res = self.get_success(
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self.store.have_seen_events(self.room_id, [self.event_ids[0]])
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)
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self.assertEqual(res, {self.event_ids[0]})
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self.assertEqual(ctx.get_resource_usage().db_txn_count, 0)
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def test_persisting_event_invalidates_cache(self):
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"""
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Test to make sure that the `have_seen_event` cache
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is invalidated after we persist an event and returns
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the updated value.
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"""
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event, event_context = self.get_success(
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create_event(
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self.hs,
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room_id=self.room_id,
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sender=self.user,
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type="test_event_type",
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content={"body": "garply"},
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)
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)
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with LoggingContext(name="test") as ctx:
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# First, check `have_seen_event` for an event we have not seen yet
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# to prime the cache with a `false` value.
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res = self.get_success(
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self.store.have_seen_events(event.room_id, [event.event_id])
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)
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self.assertEqual(res, set())
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# That should result in a single db query to lookup
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self.assertEqual(ctx.get_resource_usage().db_txn_count, 1)
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# Persist the event which should invalidate or prefill the
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# `have_seen_event` cache so we don't return stale values.
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persistence = self.hs.get_storage_controllers().persistence
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self.get_success(
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persistence.persist_event(
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event,
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event_context,
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)
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)
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with LoggingContext(name="test") as ctx:
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# Check `have_seen_event` again and we should see the updated fact
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# that we have now seen the event after persisting it.
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res = self.get_success(
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self.store.have_seen_events(event.room_id, [event.event_id])
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)
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self.assertEqual(res, {event.event_id})
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# That should result in a single db query to lookup
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self.assertEqual(ctx.get_resource_usage().db_txn_count, 1)
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def test_invalidate_cache_by_room_id(self):
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"""
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Test to make sure that all events associated with the given `(room_id,)`
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are invalidated in the `have_seen_event` cache.
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"""
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with LoggingContext(name="test") as ctx:
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# Prime the cache with some values
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res = self.get_success(
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self.store.have_seen_events(self.room_id, self.event_ids)
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)
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self.assertEqual(res, set(self.event_ids))
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# That should result in a single db query to lookup
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self.assertEqual(ctx.get_resource_usage().db_txn_count, 1)
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# Clear the cache with any events associated with the `room_id`
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self.store.have_seen_event.invalidate((self.room_id,))
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with LoggingContext(name="test") as ctx:
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res = self.get_success(
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self.store.have_seen_events(self.room_id, self.event_ids)
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)
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self.assertEqual(res, set(self.event_ids))
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# Since we cleared the cache, it should result in another db query to lookup
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self.assertEqual(ctx.get_resource_usage().db_txn_count, 1)
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class EventCacheTestCase(unittest.HomeserverTestCase):
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"""Test that the various layers of event cache works."""
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servlets = [
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admin.register_servlets,
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room.register_servlets,
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login.register_servlets,
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]
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def prepare(self, reactor, clock, hs):
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self.store: EventsWorkerStore = hs.get_datastores().main
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self.user = self.register_user("user", "pass")
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self.token = self.login(self.user, "pass")
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self.room = self.helper.create_room_as(self.user, tok=self.token)
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res = self.helper.send(self.room, tok=self.token)
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self.event_id = res["event_id"]
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# Reset the event cache so the tests start with it empty
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self.get_success(self.store._get_event_cache.clear())
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def test_simple(self):
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"""Test that we cache events that we pull from the DB."""
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with LoggingContext("test") as ctx:
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self.get_success(self.store.get_event(self.event_id))
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# We should have fetched the event from the DB
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self.assertEqual(ctx.get_resource_usage().evt_db_fetch_count, 1)
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def test_event_ref(self):
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"""Test that we reuse events that are still in memory but have fallen
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out of the cache, rather than requesting them from the DB.
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"""
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# Reset the event cache
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self.get_success(self.store._get_event_cache.clear())
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with LoggingContext("test") as ctx:
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# We keep hold of the event event though we never use it.
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event = self.get_success(self.store.get_event(self.event_id)) # noqa: F841
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# We should have fetched the event from the DB
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self.assertEqual(ctx.get_resource_usage().evt_db_fetch_count, 1)
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# Reset the event cache
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self.get_success(self.store._get_event_cache.clear())
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with LoggingContext("test") as ctx:
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self.get_success(self.store.get_event(self.event_id))
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# Since the event is still in memory we shouldn't have fetched it
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# from the DB
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self.assertEqual(ctx.get_resource_usage().evt_db_fetch_count, 0)
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def test_dedupe(self):
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"""Test that if we request the same event multiple times we only pull it
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out once.
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"""
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with LoggingContext("test") as ctx:
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d = yieldable_gather_results(
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self.store.get_event, [self.event_id, self.event_id]
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)
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self.get_success(d)
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# We should have fetched the event from the DB
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self.assertEqual(ctx.get_resource_usage().evt_db_fetch_count, 1)
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class DatabaseOutageTestCase(unittest.HomeserverTestCase):
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"""Test event fetching during a database outage."""
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def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer):
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self.store: EventsWorkerStore = hs.get_datastores().main
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self.room_id = f"!room:{hs.hostname}"
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self._populate_events()
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def _populate_events(self) -> None:
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"""Ensure that there are test events in the database.
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When testing with the in-memory SQLite database, all the events are lost during
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the simulated outage.
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To ensure consistency between `room_id`s and `event_id`s before and after the
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outage, rows are built and inserted manually.
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Upserts are used to handle the non-SQLite case where events are not lost.
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"""
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self.get_success(
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self.store.db_pool.simple_upsert(
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"rooms",
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{"room_id": self.room_id},
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{"room_version": RoomVersions.V4.identifier},
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)
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)
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self.event_ids: List[str] = []
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for idx in range(20):
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event_json = {
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"type": f"test {idx}",
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"room_id": self.room_id,
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}
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event = make_event_from_dict(event_json, room_version=RoomVersions.V4)
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event_id = event.event_id
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self.get_success(
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self.store.db_pool.simple_upsert(
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"events",
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{"event_id": event_id},
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{
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"event_id": event_id,
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"room_id": self.room_id,
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"topological_ordering": idx,
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"stream_ordering": idx,
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"type": event.type,
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"processed": True,
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"outlier": False,
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},
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)
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)
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self.get_success(
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self.store.db_pool.simple_upsert(
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"event_json",
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{"event_id": event_id},
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{
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"room_id": self.room_id,
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"json": json.dumps(event_json),
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"internal_metadata": "{}",
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"format_version": EventFormatVersions.ROOM_V4_PLUS,
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},
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)
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)
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self.event_ids.append(event_id)
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@contextmanager
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def _outage(self) -> Generator[None, None, None]:
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"""Simulate a database outage.
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Returns:
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A context manager. While the context is active, any attempts to connect to
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the database will fail.
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"""
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connection_pool = self.store.db_pool._db_pool
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# Close all connections and shut down the database `ThreadPool`.
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connection_pool.close()
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# Restart the database `ThreadPool`.
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connection_pool.start()
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original_connection_factory = connection_pool.connectionFactory
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def connection_factory(_pool: ConnectionPool) -> Connection:
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raise Exception("Could not connect to the database.")
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connection_pool.connectionFactory = connection_factory # type: ignore[assignment]
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try:
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yield
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finally:
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connection_pool.connectionFactory = original_connection_factory
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# If the in-memory SQLite database is being used, all the events are gone.
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# Restore the test data.
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self._populate_events()
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def test_failure(self) -> None:
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"""Test that event fetches do not get stuck during a database outage."""
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with self._outage():
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failure = self.get_failure(
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self.store.get_event(self.event_ids[0]), Exception
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)
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self.assertEqual(str(failure.value), "Could not connect to the database.")
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def test_recovery(self) -> None:
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"""Test that event fetchers recover after a database outage."""
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with self._outage():
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# Kick off a bunch of event fetches but do not pump the reactor
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event_deferreds = []
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for event_id in self.event_ids:
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event_deferreds.append(ensureDeferred(self.store.get_event(event_id)))
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# We should have maxed out on event fetcher threads
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self.assertEqual(self.store._event_fetch_ongoing, EVENT_QUEUE_THREADS)
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# All the event fetchers will fail
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self.pump()
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self.assertEqual(self.store._event_fetch_ongoing, 0)
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for event_deferred in event_deferreds:
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failure = self.get_failure(event_deferred, Exception)
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self.assertEqual(
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str(failure.value), "Could not connect to the database."
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)
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# This next event fetch should succeed
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self.get_success(self.store.get_event(self.event_ids[0]))
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class GetEventCancellationTestCase(unittest.HomeserverTestCase):
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"""Test cancellation of `get_event` calls."""
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servlets = [
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admin.register_servlets,
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room.register_servlets,
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login.register_servlets,
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]
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def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer):
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self.store: EventsWorkerStore = hs.get_datastores().main
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self.user = self.register_user("user", "pass")
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self.token = self.login(self.user, "pass")
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self.room = self.helper.create_room_as(self.user, tok=self.token)
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res = self.helper.send(self.room, tok=self.token)
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self.event_id = res["event_id"]
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# Reset the event cache so the tests start with it empty
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self.get_success(self.store._get_event_cache.clear())
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@contextmanager
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def blocking_get_event_calls(
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self,
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) -> Generator[
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Tuple["Deferred[None]", "Deferred[None]", "Deferred[None]"], None, None
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]:
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"""Starts two concurrent `get_event` calls for the same event.
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Both `get_event` calls will use the same database fetch, which will be blocked
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at the time this function returns.
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Returns:
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A tuple containing:
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* A `Deferred` that unblocks the database fetch.
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* A cancellable `Deferred` for the first `get_event` call.
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* A cancellable `Deferred` for the second `get_event` call.
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"""
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# Patch `DatabasePool.runWithConnection` to block.
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unblock: "Deferred[None]" = Deferred()
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original_runWithConnection = self.store.db_pool.runWithConnection
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async def runWithConnection(*args, **kwargs):
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await unblock
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return await original_runWithConnection(*args, **kwargs)
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with mock.patch.object(
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self.store.db_pool,
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"runWithConnection",
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new=runWithConnection,
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):
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ctx1 = LoggingContext("get_event1")
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ctx2 = LoggingContext("get_event2")
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async def get_event(ctx: LoggingContext) -> None:
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with ctx:
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await self.store.get_event(self.event_id)
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get_event1 = ensureDeferred(get_event(ctx1))
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get_event2 = ensureDeferred(get_event(ctx2))
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# Both `get_event` calls ought to be blocked.
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self.assertNoResult(get_event1)
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self.assertNoResult(get_event2)
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yield unblock, get_event1, get_event2
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# Confirm that the two `get_event` calls shared the same database fetch.
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self.assertEqual(ctx1.get_resource_usage().evt_db_fetch_count, 1)
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self.assertEqual(ctx2.get_resource_usage().evt_db_fetch_count, 0)
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def test_first_get_event_cancelled(self):
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"""Test cancellation of the first `get_event` call sharing a database fetch.
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The first `get_event` call is the one which initiates the fetch. We expect the
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fetch to complete despite the cancellation. Furthermore, the first `get_event`
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call must not abort before the fetch is complete, otherwise the fetch will be
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using a finished logging context.
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"""
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with self.blocking_get_event_calls() as (unblock, get_event1, get_event2):
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# Cancel the first `get_event` call.
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get_event1.cancel()
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# The first `get_event` call must not abort immediately, otherwise its
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# logging context will be finished while it is still in use by the database
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# fetch.
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self.assertNoResult(get_event1)
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# The second `get_event` call must not be cancelled.
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self.assertNoResult(get_event2)
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# Unblock the database fetch.
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unblock.callback(None)
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# A `CancelledError` should be raised out of the first `get_event` call.
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exc = self.get_failure(get_event1, CancelledError).value
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self.assertIsInstance(exc, CancelledError)
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# The second `get_event` call should complete successfully.
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self.get_success(get_event2)
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def test_second_get_event_cancelled(self):
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"""Test cancellation of the second `get_event` call sharing a database fetch."""
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with self.blocking_get_event_calls() as (unblock, get_event1, get_event2):
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# Cancel the second `get_event` call.
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get_event2.cancel()
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# The first `get_event` call must not be cancelled.
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self.assertNoResult(get_event1)
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# The second `get_event` call gets cancelled immediately.
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exc = self.get_failure(get_event2, CancelledError).value
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self.assertIsInstance(exc, CancelledError)
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# Unblock the database fetch.
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unblock.callback(None)
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# The first `get_event` call should complete successfully.
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self.get_success(get_event1)
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