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Ensure we don't use unpersisted state group as prev group

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This commit is contained in:
Erik Johnston 2017-06-08 11:59:57 +01:00
parent c62c480dc6
commit ea11ee09f3
2 changed files with 19 additions and 7 deletions
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13
synapse/state.py
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@ -273,7 +273,8 @@ class StateHandler(object):
}
elif entry.prev_group:
context.prev_group = entry.prev_group
context.delta_ids = entry.delta_ids
context.delta_ids = dict(entry.delta_ids)
context.delta_ids[key] = event.event_id
else:
if entry.state_group is None:
entry.state_group = self.store.get_next_state_group()
@ -364,12 +365,10 @@ class StateHandler(object):
if new_state_event_ids == frozenset(e_id for e_id in events):
state_group = sg
break
if state_group is None:
# Worker instances don't have access to this method, but we want
# to set the state_group on the main instance to increase cache
# hits.
if hasattr(self.store, "get_next_state_group"):
state_group = self.store.get_next_state_group()
# TODO: We want to create a state group for this set of events, to
# increase cache hits, but we need to make sure that it doesn't
# end up as a prev_group without being added to the database
prev_group = None
delta_ids = None

13
synapse/storage/state.py
View file

@ -223,6 +223,19 @@ class StateStore(SQLBaseStore):
# We persist as a delta if we can, while also ensuring the chain
# of deltas isn't tooo long, as otherwise read performance degrades.
if context.prev_group:
is_in_db = self._simple_select_one_onecol_txn(
txn,
table="state_groups",
keyvalues={"id": context.prev_group},
retcol="id",
allow_none=True,
)
if not is_in_db:
raise Exception(
"Trying to persist state with unpersisted prev_group: %r"
% (context.prev_group,)
)
potential_hops = self._count_state_group_hops_txn(
txn, context.prev_group
)