From 7941a70fa8b297b0dec320a9b7dda01df3efe1e4 Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Tue, 5 May 2020 14:17:27 +0100 Subject: [PATCH] Fix bug in EventContext.deserialize. (#7393) This caused `prev_state_ids` to be incorrect if the state event was not replacing an existing state entry. --- changelog.d/7393.bugfix | 1 + synapse/events/snapshot.py | 7 +- tests/events/test_snapshot.py | 100 ++++++++++++++++++++++++++++ tests/test_utils/event_injection.py | 26 ++++++-- 4 files changed, 126 insertions(+), 8 deletions(-) create mode 100644 changelog.d/7393.bugfix create mode 100644 tests/events/test_snapshot.py diff --git a/changelog.d/7393.bugfix b/changelog.d/7393.bugfix new file mode 100644 index 000000000..74419af85 --- /dev/null +++ b/changelog.d/7393.bugfix @@ -0,0 +1 @@ +Fix bug in `EventContext.deserialize`. diff --git a/synapse/events/snapshot.py b/synapse/events/snapshot.py index 9ea85e93e..7c5f620d0 100644 --- a/synapse/events/snapshot.py +++ b/synapse/events/snapshot.py @@ -322,11 +322,14 @@ class _AsyncEventContextImpl(EventContext): self._current_state_ids = yield self._storage.state.get_state_ids_for_group( self.state_group ) - if self._prev_state_id and self._event_state_key is not None: + if self._event_state_key is not None: self._prev_state_ids = dict(self._current_state_ids) key = (self._event_type, self._event_state_key) - self._prev_state_ids[key] = self._prev_state_id + if self._prev_state_id: + self._prev_state_ids[key] = self._prev_state_id + else: + self._prev_state_ids.pop(key, None) else: self._prev_state_ids = self._current_state_ids diff --git a/tests/events/test_snapshot.py b/tests/events/test_snapshot.py new file mode 100644 index 000000000..640f5f3bc --- /dev/null +++ b/tests/events/test_snapshot.py @@ -0,0 +1,100 @@ +# -*- coding: utf-8 -*- +# Copyright 2020 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 synapse.events.snapshot import EventContext +from synapse.rest import admin +from synapse.rest.client.v1 import login, room + +from tests import unittest +from tests.test_utils.event_injection import create_event + + +class TestEventContext(unittest.HomeserverTestCase): + servlets = [ + admin.register_servlets, + login.register_servlets, + room.register_servlets, + ] + + def prepare(self, reactor, clock, hs): + self.store = hs.get_datastore() + self.storage = hs.get_storage() + + self.user_id = self.register_user("u1", "pass") + self.user_tok = self.login("u1", "pass") + self.room_id = self.helper.create_room_as(tok=self.user_tok) + + def test_serialize_deserialize_msg(self): + """Test that an EventContext for a message event is the same after + serialize/deserialize. + """ + + event, context = create_event( + self.hs, room_id=self.room_id, type="m.test", sender=self.user_id, + ) + + self._check_serialize_deserialize(event, context) + + def test_serialize_deserialize_state_no_prev(self): + """Test that an EventContext for a state event (with not previous entry) + is the same after serialize/deserialize. + """ + event, context = create_event( + self.hs, + room_id=self.room_id, + type="m.test", + sender=self.user_id, + state_key="", + ) + + self._check_serialize_deserialize(event, context) + + def test_serialize_deserialize_state_prev(self): + """Test that an EventContext for a state event (which replaces a + previous entry) is the same after serialize/deserialize. + """ + event, context = create_event( + self.hs, + room_id=self.room_id, + type="m.room.member", + sender=self.user_id, + state_key=self.user_id, + content={"membership": "leave"}, + ) + + self._check_serialize_deserialize(event, context) + + def _check_serialize_deserialize(self, event, context): + serialized = self.get_success(context.serialize(event, self.store)) + + d_context = EventContext.deserialize(self.storage, serialized) + + self.assertEqual(context.state_group, d_context.state_group) + self.assertEqual(context.rejected, d_context.rejected) + self.assertEqual( + context.state_group_before_event, d_context.state_group_before_event + ) + self.assertEqual(context.prev_group, d_context.prev_group) + self.assertEqual(context.delta_ids, d_context.delta_ids) + self.assertEqual(context.app_service, d_context.app_service) + + self.assertEqual( + self.get_success(context.get_current_state_ids()), + self.get_success(d_context.get_current_state_ids()), + ) + self.assertEqual( + self.get_success(context.get_prev_state_ids()), + self.get_success(d_context.get_prev_state_ids()), + ) diff --git a/tests/test_utils/event_injection.py b/tests/test_utils/event_injection.py index 8f6872761..431e9f8e5 100644 --- a/tests/test_utils/event_injection.py +++ b/tests/test_utils/event_injection.py @@ -14,12 +14,13 @@ # See the License for the specific language governing permissions and # limitations under the License. -from typing import Optional +from typing import Optional, Tuple import synapse.server from synapse.api.constants import EventTypes from synapse.api.room_versions import KNOWN_ROOM_VERSIONS from synapse.events import EventBase +from synapse.events.snapshot import EventContext from synapse.types import Collection from tests.test_utils import get_awaitable_result @@ -75,6 +76,23 @@ def inject_event( """ test_reactor = hs.get_reactor() + event, context = create_event(hs, room_version, prev_event_ids, **kwargs) + + d = hs.get_storage().persistence.persist_event(event, context) + test_reactor.advance(0) + get_awaitable_result(d) + + return event + + +def create_event( + hs: synapse.server.HomeServer, + room_version: Optional[str] = None, + prev_event_ids: Optional[Collection[str]] = None, + **kwargs +) -> Tuple[EventBase, EventContext]: + test_reactor = hs.get_reactor() + if room_version is None: d = hs.get_datastore().get_room_version_id(kwargs["room_id"]) test_reactor.advance(0) @@ -89,8 +107,4 @@ def inject_event( test_reactor.advance(0) event, context = get_awaitable_result(d) - d = hs.get_storage().persistence.persist_event(event, context) - test_reactor.advance(0) - get_awaitable_result(d) - - return event + return event, context