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/sync: fix bug in calculating state response (#16930)
Fix a long-standing issue which could cause state to be omitted from the sync response if the last event was filtered out. Fixes: https://github.com/element-hq/synapse/issues/16928
This commit is contained in:
Richard van der Hoff
GitHub
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05957ac70f
commit
230b709d9d
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changelog.d/16930.bugfix
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1
changelog.d/16930.bugfix
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@ -0,0 +1 @@
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Fix a long-standing bug which could cause state to be omitted from `/sync` responses when certain events are filtered out of the timeline.
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@ -1187,15 +1187,14 @@ class SyncHandler:
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await_full_state = True
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lazy_load_members = False
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if batch:
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state_at_timeline_end = (
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await self._state_storage_controller.get_state_ids_for_event(
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batch.events[-1].event_id,
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state_at_timeline_end = await self.get_state_at(
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room_id,
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stream_position=end_token,
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state_filter=state_filter,
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await_full_state=await_full_state,
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)
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)
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if batch:
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state_at_timeline_start = (
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await self._state_storage_controller.get_state_ids_for_event(
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batch.events[0].event_id,
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@ -1204,13 +1203,6 @@ class SyncHandler:
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)
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)
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else:
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state_at_timeline_end = await self.get_state_at(
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room_id,
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stream_position=end_token,
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state_filter=state_filter,
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await_full_state=await_full_state,
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)
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state_at_timeline_start = state_at_timeline_end
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state_ids = _calculate_state(
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@ -1305,17 +1297,6 @@ class SyncHandler:
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await_full_state=await_full_state,
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)
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if batch:
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state_at_timeline_end = (
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await self._state_storage_controller.get_state_ids_for_event(
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batch.events[-1].event_id,
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state_filter=state_filter,
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await_full_state=await_full_state,
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)
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)
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else:
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# We can get here if the user has ignored the senders of all
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# the recent events.
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state_at_timeline_end = await self.get_state_at(
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room_id,
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stream_position=end_token,
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@ -2847,15 +2828,6 @@ def _calculate_state(
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# timeline. We have no way to represent that in the /sync response, and we don't
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# even try; it is ether omitted or plonked into `state` as if it were at the start
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# of the timeline, depending on what else is in the timeline.)
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#
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# ----------
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#
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# Aside 2: it's worth noting that `timeline_end`, as provided to us, is actually
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# the state *before* the final event in the timeline. In other words: if the final
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# event in the timeline is a state event, it won't be included in `timeline_end`.
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# However, that doesn't matter here, because the only difference can be in that
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# one piece of state, and by definition that event is in the timeline, so we
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# don't need to include it in the `state` section.
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state_ids = (
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(timeline_end_ids | timeline_start_ids)
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@ -355,6 +355,86 @@ class SyncTestCase(tests.unittest.HomeserverTestCase):
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[s2_event],
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)
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def test_state_includes_changes_on_forks_when_events_excluded(self) -> None:
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"""A variation on the previous test, but where one event is filtered
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The DAG is the same as the previous test, but E4 is excluded by the filter.
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E1
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↗ ↖
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| S2
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| ↑
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--|------|----
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| |
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E3 |
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↖ /
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(E4)
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"""
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alice = self.register_user("alice", "password")
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alice_tok = self.login(alice, "password")
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alice_requester = create_requester(alice)
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room_id = self.helper.create_room_as(alice, is_public=True, tok=alice_tok)
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# Do an initial sync as Alice to get a known starting point.
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initial_sync_result = self.get_success(
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self.sync_handler.wait_for_sync_for_user(
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alice_requester, generate_sync_config(alice)
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)
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)
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last_room_creation_event_id = (
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initial_sync_result.joined[0].timeline.events[-1].event_id
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)
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# Send a state event, and a regular event, both using the same prev ID
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with self._patch_get_latest_events([last_room_creation_event_id]):
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s2_event = self.helper.send_state(room_id, "s2", {}, tok=alice_tok)[
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"event_id"
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]
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e3_event = self.helper.send(room_id, "e3", tok=alice_tok)["event_id"]
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# Send a final event, joining the two branches of the dag
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self.helper.send(room_id, "e4", type="not_a_normal_message", tok=alice_tok)[
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"event_id"
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]
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# do an incremental sync, with a filter that will only return E3, excluding S2
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# and E4.
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incremental_sync = self.get_success(
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self.sync_handler.wait_for_sync_for_user(
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alice_requester,
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generate_sync_config(
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alice,
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filter_collection=FilterCollection(
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self.hs,
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{
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"room": {
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"timeline": {
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"limit": 1,
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"not_types": ["not_a_normal_message"],
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}
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}
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},
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),
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),
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since_token=initial_sync_result.next_batch,
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)
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)
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# The state event should appear in the 'state' section of the response.
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room_sync = incremental_sync.joined[0]
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self.assertEqual(room_sync.room_id, room_id)
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self.assertTrue(room_sync.timeline.limited)
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self.assertEqual(
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[e.event_id for e in room_sync.timeline.events],
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[e3_event],
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)
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self.assertEqual(
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[e.event_id for e in room_sync.state.values()],
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[s2_event],
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)
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@parameterized.expand(
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[
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(False, False),
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