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Refactor event ordering check to events store

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This commit is contained in:
Luke Barnard 2017-04-11 17:34:09 +01:00
parent 131485ef66
commit 73880268ef
2 changed files with 32 additions and 28 deletions
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28
synapse/storage/events.py
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@ -2159,6 +2159,34 @@ class EventsStore(SQLBaseStore):
]
)
@defer.inlineCallbacks
def is_event_after(self, event_id1, event_id2):
is_after = True
to_1, so_1 = yield self._get_event_ordering(event_id1)
to_2, so_2 = yield self._get_event_ordering(event_id2)
# Prevent updating if the existing marker is ahead in the stream
if to_1 > to_2:
is_after = False
elif to_1 == to_2 and so_1 >= so_2:
is_after = False
defer.returnValue(is_after)
@defer.inlineCallbacks
def _get_event_ordering(self, event_id):
res = yield self._simple_select_one(
table="events",
retcols=["topological_ordering", "stream_ordering"],
keyvalues={"event_id": event_id},
allow_none=True
)
if not res:
raise SynapseError(404, "Could not find event %s" % (event_id,))
defer.returnValue((int(res["topological_ordering"]), int(res["stream_ordering"])))
AllNewEventsResult = namedtuple("AllNewEventsResult", [
"new_forward_events", "new_backfill_events",