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Correctly handle outliers during persist events

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We incorrectly asserted that all contexts must have a non None state
group without consider outliers. This would usually be fine as the
assertion would never be hit, as there is a shortcut during persistence
if the forward extremities don't change.

However, if the outlier is being persisted with non-outlier events, the
function would be called and the assertion would be hit.

Fixes #3601
This commit is contained in:
Erik Johnston 2018-07-25 09:35:02 +01:00
parent 1e5dbdcbb1
commit ec56121b0d
1 changed files with 7 additions and 6 deletions
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13
synapse/storage/events.py
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@ -575,11 +575,12 @@ class EventsStore(EventsWorkerStore):
for ev, ctx in events_context:
if ctx.state_group is None:
# I don't think this can happen, but let's double-check
raise Exception(
"Context for new extremity event %s has no state "
"group" % (ev.event_id, ),
)
# This should only happen for outlier events.
if not event.internal_metadata.is_outlier():
raise Exception(
"Context for new event %s has no state "
"group" % (ev.event_id, ),
)
if ctx.state_group in state_groups_map:
continue
@ -607,7 +608,7 @@ class EventsStore(EventsWorkerStore):
for event_id in new_latest_event_ids:
# First search in the list of new events we're adding.
for ev, ctx in events_context:
if event_id == ev.event_id:
if event_id == ev.event_id and ctx.state_group is not None:
event_id_to_state_group[event_id] = ctx.state_group
break
else: