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Ensure we only persist an event once at a time

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This commit is contained in:
Erik Johnston 2016-08-03 11:23:39 +01:00
parent 06f812b95c
commit a8a32d2714
1 changed files with 18 additions and 1 deletions
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19
synapse/storage/events.py
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@ -26,7 +26,7 @@ from synapse.api.constants import EventTypes
from synapse.api.errors import SynapseError
from canonicaljson import encode_canonical_json
from collections import deque, namedtuple
from collections import deque, namedtuple, OrderedDict
import synapse
import synapse.metrics
@ -403,6 +403,23 @@ class EventsStore(SQLBaseStore):
and the rejections table. Things reading from those table will need to check
whether the event was rejected.
"""
# Ensure that we don't have the same event twice.
# Pick the earliest non-outlier if there is one, else the earliest one.
new_events_and_contexts = OrderedDict()
for event, context in events_and_contexts:
prev_event_context = new_events_and_contexts.get(event.event_id)
if prev_event_context:
if not event.internal_metadata.is_outlier():
if prev_event_context[0].internal_metadata.is_outlier():
# To ensure correct ordering we pop, as OrderedDict is
# ordered by first insertion.
new_events_and_contexts.pop(event.event_id, None)
new_events_and_contexts[event.event_id] = (event, context)
else:
new_events_and_contexts[event.event_id] = (event, context)
events_and_contexts = new_events_and_contexts.values()
depth_updates = {}
for event, context in events_and_contexts:
# Remove the any existing cache entries for the event_ids