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https://mau.dev/maunium/synapse.git
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1531b214fc
The idea here is that if an instance persists an event via the replication HTTP API it can return before we receive that event over replication, which can lead to races where code assumes that persisting an event immediately updates various caches (e.g. current state of the room). Most of Synapse doesn't hit such races, so we don't do the waiting automagically, instead we do so where necessary to avoid unnecessary delays. We may decide to change our minds here if it turns out there are a lot of subtle races going on. People probably want to look at this commit by commit.
403 lines
14 KiB
Python
403 lines
14 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2019 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 os.path
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from unittest.mock import patch
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from mock import Mock
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import synapse.rest.admin
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from synapse.api.constants import EventTypes
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from synapse.rest.client.v1 import login, room
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from synapse.storage import prepare_database
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from synapse.types import Requester, UserID
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from tests.unittest import HomeserverTestCase
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class CleanupExtremBackgroundUpdateStoreTestCase(HomeserverTestCase):
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"""
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Test the background update to clean forward extremities table.
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"""
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def prepare(self, reactor, clock, homeserver):
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self.store = homeserver.get_datastore()
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self.room_creator = homeserver.get_room_creation_handler()
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# Create a test user and room
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self.user = UserID("alice", "test")
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self.requester = Requester(self.user, None, False, None, None)
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info, _ = self.get_success(self.room_creator.create_room(self.requester, {}))
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self.room_id = info["room_id"]
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def run_background_update(self):
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"""Re run the background update to clean up the extremities.
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"""
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# Make sure we don't clash with in progress updates.
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self.assertTrue(
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self.store.db.updates._all_done, "Background updates are still ongoing"
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)
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schema_path = os.path.join(
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prepare_database.dir_path,
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"data_stores",
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"main",
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"schema",
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"delta",
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"54",
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"delete_forward_extremities.sql",
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)
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def run_delta_file(txn):
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prepare_database.executescript(txn, schema_path)
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self.get_success(
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self.store.db.runInteraction(
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"test_delete_forward_extremities", run_delta_file
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)
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)
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# Ugh, have to reset this flag
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self.store.db.updates._all_done = False
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while not self.get_success(
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self.store.db.updates.has_completed_background_updates()
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):
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self.get_success(
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self.store.db.updates.do_next_background_update(100), by=0.1
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)
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def test_soft_failed_extremities_handled_correctly(self):
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"""Test that extremities are correctly calculated in the presence of
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soft failed events.
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Tests a graph like:
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A <- SF1 <- SF2 <- B
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Where SF* are soft failed.
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"""
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# Create the room graph
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event_id_1 = self.create_and_send_event(self.room_id, self.user)
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event_id_2 = self.create_and_send_event(
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self.room_id, self.user, True, [event_id_1]
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)
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event_id_3 = self.create_and_send_event(
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self.room_id, self.user, True, [event_id_2]
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)
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event_id_4 = self.create_and_send_event(
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self.room_id, self.user, False, [event_id_3]
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)
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# Check the latest events are as expected
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertEqual(latest_event_ids, [event_id_4])
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def test_basic_cleanup(self):
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"""Test that extremities are correctly calculated in the presence of
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soft failed events.
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Tests a graph like:
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A <- SF1 <- B
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Where SF* are soft failed, and with extremities of A and B
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"""
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# Create the room graph
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event_id_a = self.create_and_send_event(self.room_id, self.user)
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event_id_sf1 = self.create_and_send_event(
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self.room_id, self.user, True, [event_id_a]
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)
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event_id_b = self.create_and_send_event(
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self.room_id, self.user, False, [event_id_sf1]
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)
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# Add the new extremity and check the latest events are as expected
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self.add_extremity(self.room_id, event_id_a)
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertEqual(set(latest_event_ids), {event_id_a, event_id_b})
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# Run the background update and check it did the right thing
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self.run_background_update()
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertEqual(latest_event_ids, [event_id_b])
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def test_chain_of_fail_cleanup(self):
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"""Test that extremities are correctly calculated in the presence of
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soft failed events.
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Tests a graph like:
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A <- SF1 <- SF2 <- B
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Where SF* are soft failed, and with extremities of A and B
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"""
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# Create the room graph
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event_id_a = self.create_and_send_event(self.room_id, self.user)
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event_id_sf1 = self.create_and_send_event(
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self.room_id, self.user, True, [event_id_a]
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)
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event_id_sf2 = self.create_and_send_event(
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self.room_id, self.user, True, [event_id_sf1]
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)
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event_id_b = self.create_and_send_event(
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self.room_id, self.user, False, [event_id_sf2]
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)
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# Add the new extremity and check the latest events are as expected
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self.add_extremity(self.room_id, event_id_a)
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertEqual(set(latest_event_ids), {event_id_a, event_id_b})
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# Run the background update and check it did the right thing
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self.run_background_update()
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertEqual(latest_event_ids, [event_id_b])
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def test_forked_graph_cleanup(self):
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r"""Test that extremities are correctly calculated in the presence of
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soft failed events.
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Tests a graph like, where time flows down the page:
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A B
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/ \ /
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/ \ /
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SF1 SF2
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SF3 |
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/ \ |
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| \ |
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C SF4
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Where SF* are soft failed, and with them A, B and C marked as
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extremities. This should resolve to B and C being marked as extremity.
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"""
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# Create the room graph
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event_id_a = self.create_and_send_event(self.room_id, self.user)
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event_id_b = self.create_and_send_event(self.room_id, self.user)
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event_id_sf1 = self.create_and_send_event(
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self.room_id, self.user, True, [event_id_a]
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)
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event_id_sf2 = self.create_and_send_event(
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self.room_id, self.user, True, [event_id_a, event_id_b]
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)
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event_id_sf3 = self.create_and_send_event(
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self.room_id, self.user, True, [event_id_sf1]
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)
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self.create_and_send_event(
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self.room_id, self.user, True, [event_id_sf2, event_id_sf3]
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) # SF4
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event_id_c = self.create_and_send_event(
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self.room_id, self.user, False, [event_id_sf3]
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)
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# Add the new extremity and check the latest events are as expected
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self.add_extremity(self.room_id, event_id_a)
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertEqual(set(latest_event_ids), {event_id_a, event_id_b, event_id_c})
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# Run the background update and check it did the right thing
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self.run_background_update()
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertEqual(set(latest_event_ids), {event_id_b, event_id_c})
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class CleanupExtremDummyEventsTestCase(HomeserverTestCase):
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CONSENT_VERSION = "1"
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EXTREMITIES_COUNT = 50
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servlets = [
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synapse.rest.admin.register_servlets_for_client_rest_resource,
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login.register_servlets,
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room.register_servlets,
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]
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def make_homeserver(self, reactor, clock):
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config = self.default_config()
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config["cleanup_extremities_with_dummy_events"] = True
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return self.setup_test_homeserver(config=config)
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def prepare(self, reactor, clock, homeserver):
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self.store = homeserver.get_datastore()
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self.room_creator = homeserver.get_room_creation_handler()
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self.event_creator_handler = homeserver.get_event_creation_handler()
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# Create a test user and room
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self.user = UserID.from_string(self.register_user("user1", "password"))
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self.token1 = self.login("user1", "password")
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self.requester = Requester(self.user, None, False, None, None)
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info, _ = self.get_success(self.room_creator.create_room(self.requester, {}))
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self.room_id = info["room_id"]
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self.event_creator = homeserver.get_event_creation_handler()
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homeserver.config.user_consent_version = self.CONSENT_VERSION
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def test_send_dummy_event(self):
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self._create_extremity_rich_graph()
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# Pump the reactor repeatedly so that the background updates have a
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# chance to run.
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self.pump(10 * 60)
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertTrue(len(latest_event_ids) < 10, len(latest_event_ids))
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@patch("synapse.handlers.message._DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY", new=0)
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def test_send_dummy_events_when_insufficient_power(self):
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self._create_extremity_rich_graph()
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# Criple power levels
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self.helper.send_state(
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self.room_id,
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EventTypes.PowerLevels,
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body={"users": {str(self.user): -1}},
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tok=self.token1,
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)
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# Pump the reactor repeatedly so that the background updates have a
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# chance to run.
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self.pump(10 * 60)
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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# Check that the room has not been pruned
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self.assertTrue(len(latest_event_ids) > 10)
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# New user with regular levels
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user2 = self.register_user("user2", "password")
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token2 = self.login("user2", "password")
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self.helper.join(self.room_id, user2, tok=token2)
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self.pump(10 * 60)
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertTrue(len(latest_event_ids) < 10, len(latest_event_ids))
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@patch("synapse.handlers.message._DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY", new=0)
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def test_send_dummy_event_without_consent(self):
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self._create_extremity_rich_graph()
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self._enable_consent_checking()
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# Pump the reactor repeatedly so that the background updates have a
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# chance to run. Attempt to add dummy event with user that has not consented
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# Check that dummy event send fails.
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self.pump(10 * 60)
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertTrue(len(latest_event_ids) == self.EXTREMITIES_COUNT)
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# Create new user, and add consent
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user2 = self.register_user("user2", "password")
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token2 = self.login("user2", "password")
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self.get_success(
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self.store.user_set_consent_version(user2, self.CONSENT_VERSION)
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)
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self.helper.join(self.room_id, user2, tok=token2)
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# Background updates should now cause a dummy event to be added to the graph
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self.pump(10 * 60)
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertTrue(len(latest_event_ids) < 10, len(latest_event_ids))
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@patch("synapse.handlers.message._DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY", new=250)
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def test_expiry_logic(self):
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"""Simple test to ensure that _expire_rooms_to_exclude_from_dummy_event_insertion()
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expires old entries correctly.
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"""
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self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion[
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"1"
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] = 100000
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self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion[
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"2"
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] = 200000
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self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion[
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"3"
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] = 300000
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self.event_creator_handler._expire_rooms_to_exclude_from_dummy_event_insertion()
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# All entries within time frame
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self.assertEqual(
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len(
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self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion
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),
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3,
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)
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# Oldest room to expire
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self.pump(1)
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self.event_creator_handler._expire_rooms_to_exclude_from_dummy_event_insertion()
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self.assertEqual(
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len(
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self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion
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),
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2,
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)
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# All rooms to expire
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self.pump(2)
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self.assertEqual(
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len(
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self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion
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),
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0,
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)
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def _create_extremity_rich_graph(self):
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"""Helper method to create bushy graph on demand"""
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event_id_start = self.create_and_send_event(self.room_id, self.user)
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for _ in range(self.EXTREMITIES_COUNT):
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self.create_and_send_event(
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self.room_id, self.user, prev_event_ids=[event_id_start]
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)
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latest_event_ids = self.get_success(
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self.store.get_latest_event_ids_in_room(self.room_id)
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)
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self.assertEqual(len(latest_event_ids), 50)
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def _enable_consent_checking(self):
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"""Helper method to enable consent checking"""
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self.event_creator._block_events_without_consent_error = "No consent from user"
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consent_uri_builder = Mock()
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consent_uri_builder.build_user_consent_uri.return_value = "http://example.com"
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self.event_creator._consent_uri_builder = consent_uri_builder
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