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Fix current_state_events table to not lie

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If we try and persist two state events that have the same ancestor we
calculate the wrong current state when persisting those events.
This commit is contained in:
Erik Johnston 2017-03-14 10:54:28 +00:00
parent f29d85d9e4
commit cc7a294e2e
1 changed files with 28 additions and 3 deletions
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31
synapse/storage/events.py
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@ -433,11 +433,36 @@ class EventsStore(SQLBaseStore):
if not new_latest_event_ids:
current_state = {}
elif was_updated:
# We work out the current state by passing the state sets to the
# state resolution algorithm. It may ask for some events, including
# the events we have yet to persist, so we need a slightly more
# complicated event lookup function than simply looking the events
# up in the db.
events_map = {ev.event_id: ev for ev, _ in events_context}
@defer.inlineCallbacks
def get_events(ev_ids):
# We get the events by first looking at the list of events we
# are trying to persist, and then fetching the rest from the DB.
db = []
to_return = {}
for ev_id in ev_ids:
ev = events_map.get(ev_id, None)
if ev:
to_return[ev_id] = ev
else:
db.append(ev_id)
if db:
evs = yield self.get_events(
ev_ids, get_prev_content=False, check_redacted=False,
)
to_return.update(evs)
defer.returnValue(to_return)
current_state = yield resolve_events(
state_sets,
state_map_factory=lambda ev_ids: self.get_events(
ev_ids, get_prev_content=False, check_redacted=False,
),
state_map_factory=get_events,
)
else:
return