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Add experimental option to reduce extremities.
Adds new config option `cleanup_extremities_with_dummy_events` which periodically sends dummy events to rooms with more than 10 extremities. THIS IS REALLY EXPERIMENTAL.
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parent
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commit
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6 changed files with 162 additions and 1 deletions
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@ -317,6 +317,12 @@ class ServerConfig(Config):
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_check_resource_config(self.listeners)
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# An experimental option to try and periodically clean up extremities
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# by sending dummy events.
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self.cleanup_extremities_with_dummy_events = config.get(
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"cleanup_extremities_with_dummy_events", False,
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)
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def has_tls_listener(self):
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return any(l["tls"] for l in self.listeners)
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@ -92,6 +92,18 @@ class _EventInternalMetadata(object):
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"""
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return getattr(self, "soft_failed", False)
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def should_proactively_send(self):
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"""Whether the eventm, if ours, should be sent to other clients and
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servers.
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This is used for sending dummy events internally. Servers and clients
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can still explicitly fetch the event.
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Returns:
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bool
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"""
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return getattr(self, "proactively_send", True)
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def _event_dict_property(key):
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# We want to be able to use hasattr with the event dict properties.
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@ -168,6 +168,9 @@ class FederationSender(object):
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if not is_mine and send_on_behalf_of is None:
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return
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if not event.internal_metadata.should_proactively_send():
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return
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try:
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# Get the state from before the event.
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# We need to make sure that this is the state from before
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@ -36,7 +36,7 @@ from synapse.api.urls import ConsentURIBuilder
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from synapse.events.validator import EventValidator
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from synapse.replication.http.send_event import ReplicationSendEventRestServlet
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from synapse.storage.state import StateFilter
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from synapse.types import RoomAlias, UserID
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from synapse.types import RoomAlias, UserID, create_requester
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from synapse.util.async_helpers import Linearizer
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from synapse.util.frozenutils import frozendict_json_encoder
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from synapse.util.logcontext import run_in_background
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@ -261,6 +261,16 @@ class EventCreationHandler(object):
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if self._block_events_without_consent_error:
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self._consent_uri_builder = ConsentURIBuilder(self.config)
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if (
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not self.config.worker_app
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and self.config.cleanup_extremities_with_dummy_events
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):
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# XXX: Send dummy events.
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self.clock.looping_call(
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self._send_dummy_events_to_fill_extremities,
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5 * 60 * 1000,
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)
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@defer.inlineCallbacks
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def create_event(self, requester, event_dict, token_id=None, txn_id=None,
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prev_events_and_hashes=None, require_consent=True):
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@ -874,3 +884,63 @@ class EventCreationHandler(object):
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yield presence.bump_presence_active_time(user)
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except Exception:
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logger.exception("Error bumping presence active time")
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@defer.inlineCallbacks
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def _send_dummy_events_to_fill_extremities(self):
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"""Background task to send dummy events into rooms that have a large
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number of extremities
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"""
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room_ids = yield self.store.get_rooms_with_many_extremities(
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min_count=10, limit=5,
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)
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for room_id in room_ids:
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# For each room we need to find a joined member we can use to send
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# the dummy event with.
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prev_events_and_hashes = yield self.store.get_prev_events_for_room(
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room_id,
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)
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latest_event_ids = (
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event_id for (event_id, _, _) in prev_events_and_hashes
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)
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members = yield self.state.get_current_users_in_room(
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room_id, latest_event_ids=latest_event_ids,
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)
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user_id = None
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for member in members:
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if self.hs.is_mine_id(member):
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user_id = member
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break
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if not user_id:
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# We don't have a joined user.
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# TODO: We should do something here to stop the room from
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# appearing next time.
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continue
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requester = create_requester(user_id)
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event, context = yield self.create_event(
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requester,
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{
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"type": "org.matrix.dummy_event",
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"content": {},
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"room_id": room_id,
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"sender": user_id,
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},
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prev_events_and_hashes=prev_events_and_hashes,
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)
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event.internal_metadata.proactively_send = False
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yield self.send_nonmember_event(
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requester,
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event,
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context,
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ratelimit=False,
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)
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@ -190,6 +190,35 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
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room_id,
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)
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def get_rooms_with_many_extremities(self, min_count, limit):
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"""Get the top rooms with at least N extremities.
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Args:
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min_count (int): The minimum number of extremities
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limit (int): The maximum number of rooms to return.
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Returns:
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Deferred[list]: At most `limit` room IDs that have at least
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`min_count` extremities, sorted by extremity count.
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"""
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def _get_rooms_with_many_extremities_txn(txn):
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sql = """
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SELECT room_id FROM event_forward_extremities
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GROUP BY room_id
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HAVING count(*) > ?
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ORDER BY count(*) DESC
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LIMIT ?
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"""
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txn.execute(sql, (min_count, limit))
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return [room_id for room_id, in txn]
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return self.runInteraction(
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"get_rooms_with_many_extremities",
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_get_rooms_with_many_extremities_txn,
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)
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@cached(max_entries=5000, iterable=True)
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def get_latest_event_ids_in_room(self, room_id):
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return self._simple_select_onecol(
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@ -222,3 +222,44 @@ class CleanupExtremBackgroundUpdateStoreTestCase(HomeserverTestCase):
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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), set([event_id_b, event_id_c]))
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class CleanupExtremDummyEventsTestCase(HomeserverTestCase):
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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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# 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 test_send_dummy_event(self):
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# Create a bushy graph with 50 extremities.
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event_id_start = self.create_and_send_event(self.room_id, self.user)
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for _ in range(50):
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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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# Bump the reacto 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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