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# Copyright 2022 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from unittest import mock
from synapse.events import make_event_from_dict
from synapse.events.snapshot import EventContext
from synapse.federation.transport.client import StateRequestResponse
from synapse.logging.context import LoggingContext
from synapse.rest import admin
from synapse.rest.client import login, room
from tests import unittest
from tests.test_utils import event_injection, make_awaitable
class FederationEventHandlerTests(unittest.FederatingHomeserverTestCase):
servlets = [
admin.register_servlets,
login.register_servlets,
room.register_servlets,
]
def make_homeserver(self, reactor, clock):
# mock out the federation transport client
self.mock_federation_transport_client = mock.Mock(
spec=["get_room_state_ids", "get_room_state", "get_event"]
)
return super().setup_test_homeserver(
federation_transport_client=self.mock_federation_transport_client
)
def test_process_pulled_event_with_missing_state(self) -> None:
"""Ensure that we correctly handle pulled events with lots of missing state
In this test, we pretend we are processing a "pulled" event (eg, via backfill
or get_missing_events). The pulled event has a prev_event we haven't previously
seen, so the server requests the state at that prev_event. There is a lot
of state we don't have, so we expect the server to make a /state request.
We check that the pulled event is correctly persisted, and that the state is
as we expect.
"""
return self._test_process_pulled_event_with_missing_state(False)
def test_process_pulled_event_with_missing_state_where_prev_is_outlier(
self,
) -> None:
"""Ensure that we correctly handle pulled events with lots of missing state
A slight modification to test_process_pulled_event_with_missing_state. Again
we have a "pulled" event which refers to a prev_event with lots of state,
but in this case we already have the prev_event (as an outlier, obviously -
if it were a regular event, we wouldn't need to request the state).
"""
return self._test_process_pulled_event_with_missing_state(True)
def _test_process_pulled_event_with_missing_state(
self, prev_exists_as_outlier: bool
) -> None:
OTHER_USER = f"@user:{self.OTHER_SERVER_NAME}"
main_store = self.hs.get_datastores().main
state_storage = self.hs.get_storage().state
# create the room
user_id = self.register_user("kermit", "test")
tok = self.login("kermit", "test")
room_id = self.helper.create_room_as(room_creator=user_id, tok=tok)
room_version = self.get_success(main_store.get_room_version(room_id))
# allow the remote user to send state events
self.helper.send_state(
room_id,
"m.room.power_levels",
{"events_default": 0, "state_default": 0},
tok=tok,
)
# add the remote user to the room
member_event = self.get_success(
event_injection.inject_member_event(self.hs, room_id, OTHER_USER, "join")
)
initial_state_map = self.get_success(main_store.get_current_state_ids(room_id))
auth_event_ids = [
initial_state_map[("m.room.create", "")],
initial_state_map[("m.room.power_levels", "")],
initial_state_map[("m.room.join_rules", "")],
member_event.event_id,
]
# mock up a load of state events which we are missing
state_events = [
make_event_from_dict(
self.add_hashes_and_signatures(
{
"type": "test_state_type",
"state_key": f"state_{i}",
"room_id": room_id,
"sender": OTHER_USER,
"prev_events": [member_event.event_id],
"auth_events": auth_event_ids,
"origin_server_ts": 1,
"depth": 10,
"content": {"body": f"state_{i}"},
}
),
room_version,
)
for i in range(1, 10)
]
# this is the state that we are going to claim is active at the prev_event.
state_at_prev_event = state_events + self.get_success(
main_store.get_events_as_list(initial_state_map.values())
)
# mock up a prev event.
# Depending on the test, we either persist this upfront (as an outlier),
# or let the server request it.
prev_event = make_event_from_dict(
self.add_hashes_and_signatures(
{
"type": "test_regular_type",
"room_id": room_id,
"sender": OTHER_USER,
"prev_events": [],
"auth_events": auth_event_ids,
"origin_server_ts": 1,
"depth": 11,
"content": {"body": "missing_prev"},
}
),
room_version,
)
if prev_exists_as_outlier:
prev_event.internal_metadata.outlier = True
persistence = self.hs.get_storage().persistence
self.get_success(
persistence.persist_event(prev_event, EventContext.for_outlier())
)
else:
async def get_event(destination: str, event_id: str, timeout=None):
self.assertEqual(destination, self.OTHER_SERVER_NAME)
self.assertEqual(event_id, prev_event.event_id)
return {"pdus": [prev_event.get_pdu_json()]}
self.mock_federation_transport_client.get_event.side_effect = get_event
# mock up a regular event to pass into _process_pulled_event
pulled_event = make_event_from_dict(
self.add_hashes_and_signatures(
{
"type": "test_regular_type",
"room_id": room_id,
"sender": OTHER_USER,
"prev_events": [prev_event.event_id],
"auth_events": auth_event_ids,
"origin_server_ts": 1,
"depth": 12,
"content": {"body": "pulled"},
}
),
room_version,
)
# we expect an outbound request to /state_ids, so stub that out
self.mock_federation_transport_client.get_room_state_ids.return_value = (
make_awaitable(
{
"pdu_ids": [e.event_id for e in state_at_prev_event],
"auth_chain_ids": [],
}
)
)
# we also expect an outbound request to /state
self.mock_federation_transport_client.get_room_state.return_value = (
make_awaitable(
StateRequestResponse(auth_events=[], state=state_at_prev_event)
)
)
# we have to bump the clock a bit, to keep the retry logic in
# FederationClient.get_pdu happy
self.reactor.advance(60000)
# Finally, the call under test: send the pulled event into _process_pulled_event
with LoggingContext("test"):
self.get_success(
self.hs.get_federation_event_handler()._process_pulled_event(
self.OTHER_SERVER_NAME, pulled_event, backfilled=False
)
)
# check that the event is correctly persisted
persisted = self.get_success(main_store.get_event(pulled_event.event_id))
self.assertIsNotNone(persisted, "pulled event was not persisted at all")
self.assertFalse(
persisted.internal_metadata.is_outlier(), "pulled event was an outlier"
)
# check that the state at that event is as expected
state = self.get_success(
state_storage.get_state_ids_for_event(pulled_event.event_id)
)
expected_state = {
(e.type, e.state_key): e.event_id for e in state_at_prev_event
}
self.assertEqual(state, expected_state)
if prev_exists_as_outlier:
self.mock_federation_transport_client.get_event.assert_not_called()
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