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https://github.com/element-hq/synapse.git
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957e3d74fc
We can follow-up this PR with: 1. Only try to backfill from an event if we haven't tried recently -> https://github.com/matrix-org/synapse/issues/13622 1. When we decide to backfill that event again, process it in the background so it doesn't block and make `/messages` slow when we know it will probably fail again -> https://github.com/matrix-org/synapse/issues/13623 1. Generally track failures everywhere we try and fail to pull an event over federation -> https://github.com/matrix-org/synapse/issues/13700 Fix https://github.com/matrix-org/synapse/issues/13621 Part of https://github.com/matrix-org/synapse/issues/13356 Mentioned in [internal doc](https://docs.google.com/document/d/1lvUoVfYUiy6UaHB6Rb4HicjaJAU40-APue9Q4vzuW3c/edit#bookmark=id.qv7cj51sv9i5)
451 lines
18 KiB
Python
451 lines
18 KiB
Python
# Copyright 2022 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 unittest import mock
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from synapse.events import make_event_from_dict
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from synapse.events.snapshot import EventContext
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from synapse.federation.transport.client import StateRequestResponse
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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 tests import unittest
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from tests.test_utils import event_injection, make_awaitable
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class FederationEventHandlerTests(unittest.FederatingHomeserverTestCase):
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servlets = [
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admin.register_servlets,
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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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# mock out the federation transport client
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self.mock_federation_transport_client = mock.Mock(
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spec=["get_room_state_ids", "get_room_state", "get_event"]
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)
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return super().setup_test_homeserver(
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federation_transport_client=self.mock_federation_transport_client
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)
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def test_process_pulled_event_with_missing_state(self) -> None:
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"""Ensure that we correctly handle pulled events with lots of missing state
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In this test, we pretend we are processing a "pulled" event (eg, via backfill
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or get_missing_events). The pulled event has a prev_event we haven't previously
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seen, so the server requests the state at that prev_event. There is a lot
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of state we don't have, so we expect the server to make a /state request.
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We check that the pulled event is correctly persisted, and that the state is
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as we expect.
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"""
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return self._test_process_pulled_event_with_missing_state(False)
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def test_process_pulled_event_with_missing_state_where_prev_is_outlier(
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self,
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) -> None:
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"""Ensure that we correctly handle pulled events with lots of missing state
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A slight modification to test_process_pulled_event_with_missing_state. Again
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we have a "pulled" event which refers to a prev_event with lots of state,
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but in this case we already have the prev_event (as an outlier, obviously -
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if it were a regular event, we wouldn't need to request the state).
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"""
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return self._test_process_pulled_event_with_missing_state(True)
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def _test_process_pulled_event_with_missing_state(
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self, prev_exists_as_outlier: bool
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) -> None:
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OTHER_USER = f"@user:{self.OTHER_SERVER_NAME}"
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main_store = self.hs.get_datastores().main
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state_storage_controller = self.hs.get_storage_controllers().state
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# create the room
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user_id = self.register_user("kermit", "test")
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tok = self.login("kermit", "test")
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room_id = self.helper.create_room_as(room_creator=user_id, tok=tok)
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room_version = self.get_success(main_store.get_room_version(room_id))
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# allow the remote user to send state events
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self.helper.send_state(
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room_id,
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"m.room.power_levels",
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{"events_default": 0, "state_default": 0},
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tok=tok,
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)
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# add the remote user to the room
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member_event = self.get_success(
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event_injection.inject_member_event(self.hs, room_id, OTHER_USER, "join")
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)
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initial_state_map = self.get_success(
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main_store.get_partial_current_state_ids(room_id)
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)
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auth_event_ids = [
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initial_state_map[("m.room.create", "")],
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initial_state_map[("m.room.power_levels", "")],
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member_event.event_id,
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]
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# mock up a load of state events which we are missing
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state_events = [
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make_event_from_dict(
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self.add_hashes_and_signatures_from_other_server(
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{
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"type": "test_state_type",
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"state_key": f"state_{i}",
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"room_id": room_id,
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"sender": OTHER_USER,
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"prev_events": [member_event.event_id],
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"auth_events": auth_event_ids,
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"origin_server_ts": 1,
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"depth": 10,
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"content": {"body": f"state_{i}"},
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}
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),
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room_version,
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)
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for i in range(1, 10)
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]
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# this is the state that we are going to claim is active at the prev_event.
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state_at_prev_event = state_events + self.get_success(
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main_store.get_events_as_list(initial_state_map.values())
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)
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# mock up a prev event.
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# Depending on the test, we either persist this upfront (as an outlier),
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# or let the server request it.
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prev_event = make_event_from_dict(
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self.add_hashes_and_signatures_from_other_server(
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{
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"type": "test_regular_type",
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"room_id": room_id,
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"sender": OTHER_USER,
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"prev_events": [],
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"auth_events": auth_event_ids,
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"origin_server_ts": 1,
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"depth": 11,
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"content": {"body": "missing_prev"},
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}
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),
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room_version,
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)
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if prev_exists_as_outlier:
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prev_event.internal_metadata.outlier = True
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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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prev_event,
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EventContext.for_outlier(self.hs.get_storage_controllers()),
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)
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)
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else:
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async def get_event(destination: str, event_id: str, timeout=None):
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self.assertEqual(destination, self.OTHER_SERVER_NAME)
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self.assertEqual(event_id, prev_event.event_id)
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return {"pdus": [prev_event.get_pdu_json()]}
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self.mock_federation_transport_client.get_event.side_effect = get_event
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# mock up a regular event to pass into _process_pulled_event
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pulled_event = make_event_from_dict(
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self.add_hashes_and_signatures_from_other_server(
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{
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"type": "test_regular_type",
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"room_id": room_id,
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"sender": OTHER_USER,
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"prev_events": [prev_event.event_id],
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"auth_events": auth_event_ids,
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"origin_server_ts": 1,
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"depth": 12,
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"content": {"body": "pulled"},
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}
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),
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room_version,
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)
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# we expect an outbound request to /state_ids, so stub that out
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self.mock_federation_transport_client.get_room_state_ids.return_value = (
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make_awaitable(
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{
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"pdu_ids": [e.event_id for e in state_at_prev_event],
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"auth_chain_ids": [],
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}
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)
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)
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# we also expect an outbound request to /state
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self.mock_federation_transport_client.get_room_state.return_value = (
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make_awaitable(
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StateRequestResponse(auth_events=[], state=state_at_prev_event)
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)
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)
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# we have to bump the clock a bit, to keep the retry logic in
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# FederationClient.get_pdu happy
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self.reactor.advance(60000)
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# Finally, the call under test: send the pulled event into _process_pulled_event
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with LoggingContext("test"):
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self.get_success(
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self.hs.get_federation_event_handler()._process_pulled_event(
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self.OTHER_SERVER_NAME, pulled_event, backfilled=False
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)
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)
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# check that the event is correctly persisted
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persisted = self.get_success(main_store.get_event(pulled_event.event_id))
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self.assertIsNotNone(persisted, "pulled event was not persisted at all")
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self.assertFalse(
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persisted.internal_metadata.is_outlier(), "pulled event was an outlier"
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)
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# check that the state at that event is as expected
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state = self.get_success(
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state_storage_controller.get_state_ids_for_event(pulled_event.event_id)
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)
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expected_state = {
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(e.type, e.state_key): e.event_id for e in state_at_prev_event
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}
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self.assertEqual(state, expected_state)
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if prev_exists_as_outlier:
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self.mock_federation_transport_client.get_event.assert_not_called()
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def test_process_pulled_event_records_failed_backfill_attempts(
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self,
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) -> None:
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"""
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Test to make sure that failed backfill attempts for an event are
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recorded in the `event_failed_pull_attempts` table.
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In this test, we pretend we are processing a "pulled" event via
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backfill. The pulled event has a fake `prev_event` which our server has
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obviously never seen before so it attempts to request the state at that
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`prev_event` which expectedly fails because it's a fake event. Because
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the server can't fetch the state at the missing `prev_event`, the
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"pulled" event fails the history check and is fails to process.
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We check that we correctly record the number of failed pull attempts
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of the pulled event and as a sanity check, that the "pulled" event isn't
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persisted.
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"""
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OTHER_USER = f"@user:{self.OTHER_SERVER_NAME}"
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main_store = self.hs.get_datastores().main
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# Create the room
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user_id = self.register_user("kermit", "test")
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tok = self.login("kermit", "test")
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room_id = self.helper.create_room_as(room_creator=user_id, tok=tok)
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room_version = self.get_success(main_store.get_room_version(room_id))
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# We expect an outbound request to /state_ids, so stub that out
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self.mock_federation_transport_client.get_room_state_ids.return_value = make_awaitable(
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{
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# Mimic the other server not knowing about the state at all.
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# We want to cause Synapse to throw an error (`Unable to get
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# missing prev_event $fake_prev_event`) and fail to backfill
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# the pulled event.
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"pdu_ids": [],
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"auth_chain_ids": [],
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}
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)
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# We also expect an outbound request to /state
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self.mock_federation_transport_client.get_room_state.return_value = make_awaitable(
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StateRequestResponse(
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# Mimic the other server not knowing about the state at all.
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# We want to cause Synapse to throw an error (`Unable to get
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# missing prev_event $fake_prev_event`) and fail to backfill
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# the pulled event.
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auth_events=[],
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state=[],
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)
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)
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pulled_event = make_event_from_dict(
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self.add_hashes_and_signatures_from_other_server(
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{
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"type": "test_regular_type",
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"room_id": room_id,
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"sender": OTHER_USER,
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"prev_events": [
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# The fake prev event will make the pulled event fail
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# the history check (`Unable to get missing prev_event
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# $fake_prev_event`)
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"$fake_prev_event"
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],
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"auth_events": [],
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"origin_server_ts": 1,
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"depth": 12,
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"content": {"body": "pulled"},
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}
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),
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room_version,
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)
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# The function under test: try to process the pulled event
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with LoggingContext("test"):
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self.get_success(
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self.hs.get_federation_event_handler()._process_pulled_event(
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self.OTHER_SERVER_NAME, pulled_event, backfilled=True
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)
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)
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# Make sure our failed pull attempt was recorded
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backfill_num_attempts = self.get_success(
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main_store.db_pool.simple_select_one_onecol(
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table="event_failed_pull_attempts",
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keyvalues={"event_id": pulled_event.event_id},
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retcol="num_attempts",
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)
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)
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self.assertEqual(backfill_num_attempts, 1)
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# The function under test: try to process the pulled event again
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with LoggingContext("test"):
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self.get_success(
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self.hs.get_federation_event_handler()._process_pulled_event(
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self.OTHER_SERVER_NAME, pulled_event, backfilled=True
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)
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)
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# Make sure our second failed pull attempt was recorded (`num_attempts` was incremented)
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backfill_num_attempts = self.get_success(
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main_store.db_pool.simple_select_one_onecol(
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table="event_failed_pull_attempts",
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keyvalues={"event_id": pulled_event.event_id},
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retcol="num_attempts",
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)
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)
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self.assertEqual(backfill_num_attempts, 2)
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# And as a sanity check, make sure the event was not persisted through all of this.
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persisted = self.get_success(
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main_store.get_event(pulled_event.event_id, allow_none=True)
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)
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self.assertIsNone(
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persisted,
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"pulled event that fails the history check should not be persisted at all",
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)
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def test_process_pulled_event_clears_backfill_attempts_after_being_successfully_persisted(
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self,
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) -> None:
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"""
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Test to make sure that failed pull attempts
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(`event_failed_pull_attempts` table) for an event are cleared after the
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event is successfully persisted.
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In this test, we pretend we are processing a "pulled" event via
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backfill. The pulled event succesfully processes and the backward
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extremeties are updated along with clearing out any failed pull attempts
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for those old extremities.
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We check that we correctly cleared failed pull attempts of the
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pulled event.
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"""
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OTHER_USER = f"@user:{self.OTHER_SERVER_NAME}"
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main_store = self.hs.get_datastores().main
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# Create the room
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user_id = self.register_user("kermit", "test")
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tok = self.login("kermit", "test")
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room_id = self.helper.create_room_as(room_creator=user_id, tok=tok)
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room_version = self.get_success(main_store.get_room_version(room_id))
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# allow the remote user to send state events
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self.helper.send_state(
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room_id,
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"m.room.power_levels",
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{"events_default": 0, "state_default": 0},
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tok=tok,
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)
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# add the remote user to the room
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member_event = self.get_success(
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event_injection.inject_member_event(self.hs, room_id, OTHER_USER, "join")
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)
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initial_state_map = self.get_success(
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main_store.get_partial_current_state_ids(room_id)
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)
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auth_event_ids = [
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initial_state_map[("m.room.create", "")],
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initial_state_map[("m.room.power_levels", "")],
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member_event.event_id,
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]
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pulled_event = make_event_from_dict(
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self.add_hashes_and_signatures_from_other_server(
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{
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"type": "test_regular_type",
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"room_id": room_id,
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"sender": OTHER_USER,
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"prev_events": [member_event.event_id],
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"auth_events": auth_event_ids,
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"origin_server_ts": 1,
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"depth": 12,
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"content": {"body": "pulled"},
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}
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),
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room_version,
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)
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# Fake the "pulled" event failing to backfill once so we can test
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# if it's cleared out later on.
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self.get_success(
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main_store.record_event_failed_pull_attempt(
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pulled_event.room_id, pulled_event.event_id, "fake cause"
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)
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)
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# Make sure we have a failed pull attempt recorded for the pulled event
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backfill_num_attempts = self.get_success(
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main_store.db_pool.simple_select_one_onecol(
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table="event_failed_pull_attempts",
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keyvalues={"event_id": pulled_event.event_id},
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retcol="num_attempts",
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)
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)
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self.assertEqual(backfill_num_attempts, 1)
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# The function under test: try to process the pulled event
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with LoggingContext("test"):
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self.get_success(
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self.hs.get_federation_event_handler()._process_pulled_event(
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self.OTHER_SERVER_NAME, pulled_event, backfilled=True
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)
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)
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# Make sure the failed pull attempts for the pulled event are cleared
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backfill_num_attempts = self.get_success(
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main_store.db_pool.simple_select_one_onecol(
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table="event_failed_pull_attempts",
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keyvalues={"event_id": pulled_event.event_id},
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retcol="num_attempts",
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allow_none=True,
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)
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)
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self.assertIsNone(backfill_num_attempts)
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# And as a sanity check, make sure the "pulled" event was persisted.
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persisted = self.get_success(
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main_store.get_event(pulled_event.event_id, allow_none=True)
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)
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self.assertIsNotNone(persisted, "pulled event was not persisted at all")
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