diff options
Diffstat (limited to 'synapse/storage/events.py')
| -rw-r--r-- | synapse/storage/events.py | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py index eb8bbe13ab..76cfbc90fe 100644 --- a/synapse/storage/events.py +++ b/synapse/storage/events.py @@ -565,6 +565,7 @@ class EventsStore(EventsWorkerStore): # map from state_group to ((type, key) -> event_id) state map state_groups_map = {} + # Map from (prev state group, new state group) -> delta state dict state_group_deltas = {} for ev, ctx in events_context: @@ -631,23 +632,24 @@ class EventsStore(EventsWorkerStore): if old_state_groups == new_state_groups: defer.returnValue((None, None)) - if len(new_state_groups) == 1: - # If there is only one state group, then we know what the current - # state is. - if len(old_state_groups) == 1: - new_state_group = next(iter(new_state_groups)) - old_state_group = next(iter(old_state_groups)) + if len(new_state_groups) == 1 and len(old_state_groups) == 1: + # If we're going from one state group to another, lets check if + # we have a delta for that transition. If we do then we can just + # return that. - delta_ids = state_group_deltas.get( - (old_state_group, new_state_group,), None - ) - if delta_ids is not None: - # We have a delta from the existing to new current state, - # so lets just return that. If we happen to already have - # the current state in memory then lets also return that, - # but it doesn't matter if we don't. - new_state = state_groups_map.get(new_state_group) - defer.returnValue((new_state, delta_ids)) + new_state_group = next(iter(new_state_groups)) + old_state_group = next(iter(old_state_groups)) + + delta_ids = state_group_deltas.get( + (old_state_group, new_state_group,), None + ) + if delta_ids is not None: + # We have a delta from the existing to new current state, + # so lets just return that. If we happen to already have + # the current state in memory then lets also return that, + # but it doesn't matter if we don't. + new_state = state_groups_map.get(new_state_group) + defer.returnValue((new_state, delta_ids)) # Now that we have calculated new_state_groups we need to get # their state IDs so we can resolve to a single state set. @@ -657,6 +659,8 @@ class EventsStore(EventsWorkerStore): state_groups_map.update(group_to_state) if len(new_state_groups) == 1: + # If there is only one state group, then we know what the current + # state is. defer.returnValue((state_groups_map[new_state_groups.pop()], None)) # Ok, we need to defer to the state handler to resolve our state sets. |