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Fix incorrect truncation in get_missing_events
It's quite important that get_missing_events returns the *latest* events in the room; however we were pulling event ids out of the database until we got *at least* 10, and then taking the *earliest* of the results. We also shouldn't really be relying on depth, and should be checking the room_id.
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changelog.d/4045.bugfix
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1
changelog.d/4045.bugfix
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@ -0,0 +1 @@
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Fix bug which made get_missing_events return too few events
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@ -507,19 +507,19 @@ class FederationServer(FederationBase):
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@defer.inlineCallbacks
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@log_function
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def on_get_missing_events(self, origin, room_id, earliest_events,
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latest_events, limit, min_depth):
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latest_events, limit):
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with (yield self._server_linearizer.queue((origin, room_id))):
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origin_host, _ = parse_server_name(origin)
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yield self.check_server_matches_acl(origin_host, room_id)
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logger.info(
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"on_get_missing_events: earliest_events: %r, latest_events: %r,"
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" limit: %d, min_depth: %d",
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earliest_events, latest_events, limit, min_depth
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" limit: %d",
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earliest_events, latest_events, limit,
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)
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missing_events = yield self.handler.on_get_missing_events(
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origin, room_id, earliest_events, latest_events, limit, min_depth
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origin, room_id, earliest_events, latest_events, limit,
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)
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if len(missing_events) < 5:
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@ -560,7 +560,6 @@ class FederationGetMissingEventsServlet(BaseFederationServlet):
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@defer.inlineCallbacks
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def on_POST(self, origin, content, query, room_id):
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limit = int(content.get("limit", 10))
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min_depth = int(content.get("min_depth", 0))
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earliest_events = content.get("earliest_events", [])
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latest_events = content.get("latest_events", [])
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@ -569,7 +568,6 @@ class FederationGetMissingEventsServlet(BaseFederationServlet):
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room_id=room_id,
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earliest_events=earliest_events,
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latest_events=latest_events,
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min_depth=min_depth,
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limit=limit,
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)
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@ -309,8 +309,8 @@ class FederationHandler(BaseHandler):
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if sent_to_us_directly:
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logger.warn(
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"[%s %s] Failed to fetch %d prev events: rejecting",
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room_id, event_id, len(prevs - seen),
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"[%s %s] Rejecting: failed to fetch %d prev events: %s",
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room_id, event_id, len(prevs - seen), shortstr(prevs - seen)
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)
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raise FederationError(
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"ERROR",
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@ -452,8 +452,8 @@ class FederationHandler(BaseHandler):
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latest |= seen
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logger.info(
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"[%s %s]: Requesting %d prev_events: %s",
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room_id, event_id, len(prevs - seen), shortstr(prevs - seen)
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"[%s %s]: Requesting missing events between %s and %s",
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room_id, event_id, shortstr(latest), event_id,
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)
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# XXX: we set timeout to 10s to help workaround
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@ -1852,7 +1852,7 @@ class FederationHandler(BaseHandler):
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@defer.inlineCallbacks
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def on_get_missing_events(self, origin, room_id, earliest_events,
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latest_events, limit, min_depth):
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latest_events, limit):
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in_room = yield self.auth.check_host_in_room(
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room_id,
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origin
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@ -1861,14 +1861,12 @@ class FederationHandler(BaseHandler):
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raise AuthError(403, "Host not in room.")
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limit = min(limit, 20)
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min_depth = max(min_depth, 0)
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missing_events = yield self.store.get_missing_events(
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room_id=room_id,
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earliest_events=earliest_events,
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latest_events=latest_events,
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limit=limit,
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min_depth=min_depth,
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)
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missing_events = yield filter_events_for_server(
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@ -376,33 +376,25 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore,
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@defer.inlineCallbacks
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def get_missing_events(self, room_id, earliest_events, latest_events,
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limit, min_depth):
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limit):
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ids = yield self.runInteraction(
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"get_missing_events",
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self._get_missing_events,
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room_id, earliest_events, latest_events, limit, min_depth
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room_id, earliest_events, latest_events, limit,
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)
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events = yield self._get_events(ids)
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events = sorted(
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[ev for ev in events if ev.depth >= min_depth],
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key=lambda e: e.depth,
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)
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defer.returnValue(events[:limit])
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defer.returnValue(events)
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def _get_missing_events(self, txn, room_id, earliest_events, latest_events,
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limit, min_depth):
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limit):
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earliest_events = set(earliest_events)
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front = set(latest_events) - earliest_events
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event_results = set()
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seen_events = set(earliest_events)
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front = set(latest_events) - seen_events
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event_results = []
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query = (
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"SELECT prev_event_id FROM event_edges "
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"WHERE event_id = ? AND is_state = ? "
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"WHERE room_id = ? AND event_id = ? AND is_state = ? "
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"LIMIT ?"
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)
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@ -411,18 +403,20 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore,
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for event_id in front:
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txn.execute(
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query,
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(event_id, False, limit - len(event_results))
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(room_id, event_id, False, limit - len(event_results))
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)
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for e_id, in txn:
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new_front.add(e_id)
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new_results = set(t[0] for t in txn) - seen_events
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new_front -= earliest_events
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new_front -= event_results
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new_front |= new_results
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seen_events |= new_results
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event_results.extend(new_results)
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front = new_front
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event_results |= new_front
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# we built the list working backwards from latest_events; we now need to
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# reverse it so that the events are approximately chronological.
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event_results.reverse()
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return event_results
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