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Don't fetch state from the database unless needed
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parent
a79410e7b8
commit
811ac73a42
@ -631,6 +631,24 @@ class EventsStore(EventsWorkerStore):
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if old_state_groups == new_state_groups:
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defer.returnValue((None, None))
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if len(new_state_groups) == 1:
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# If there is only one state group, then we know what the current
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# state is.
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if len(old_state_groups) == 1:
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new_state_group = next(iter(new_state_groups))
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old_state_group = next(iter(old_state_groups))
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delta_ids = state_group_deltas.get(
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(old_state_group, new_state_group,), None
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)
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if delta_ids is not None:
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# We have a delta from the existing to new current state,
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# so lets just return that. If we happen to already have
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# the current state in memory then lets also return that,
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# but it doesn't matter if we don't.
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new_state = state_groups_map.get(new_state_group)
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defer.returnValue((new_state, delta_ids))
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# Now that we have calculated new_state_groups we need to get
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# their state IDs so we can resolve to a single state set.
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missing_state = new_state_groups - set(state_groups_map)
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@ -639,19 +657,7 @@ class EventsStore(EventsWorkerStore):
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state_groups_map.update(group_to_state)
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if len(new_state_groups) == 1:
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# If there is only one state group, then we know what the current
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# state is.
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new_state_group = new_state_groups.pop()
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delta_ids = None
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if len(old_state_groups) == 1:
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old_state_group = old_state_groups.pop()
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delta_ids = state_group_deltas.get(
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(old_state_group, new_state_group,), None
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)
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defer.returnValue((state_groups_map[new_state_group], delta_ids))
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defer.returnValue((state_groups_map[new_state_groups.pop()], None))
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# Ok, we need to defer to the state handler to resolve our state sets.
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