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Merge pull request #975 from matrix-org/erikj/multi_event_persist

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Ensure we only persist an event once at a time
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Erik Johnston 2016-08-03 14:10:36 +01:00 committed by GitHub
commit f5da3bacb2
1 changed files with 18 additions and 20 deletions
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38
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 synapse.api.errors import SynapseError
from canonicaljson import encode_canonical_json from canonicaljson import encode_canonical_json
from collections import deque, namedtuple from collections import deque, namedtuple, OrderedDict
import synapse import synapse
import synapse.metrics import synapse.metrics
@ -403,6 +403,23 @@ class EventsStore(SQLBaseStore):
and the rejections table. Things reading from those table will need to check and the rejections table. Things reading from those table will need to check
whether the event was rejected. 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 = {} depth_updates = {}
for event, context in events_and_contexts: for event, context in events_and_contexts:
# Remove the any existing cache entries for the event_ids # Remove the any existing cache entries for the event_ids
@ -433,8 +450,6 @@ class EventsStore(SQLBaseStore):
for event_id, outlier in txn.fetchall() for event_id, outlier in txn.fetchall()
} }
# Remove the events that we've seen before.
event_map = {}
to_remove = set() to_remove = set()
for event, context in events_and_contexts: for event, context in events_and_contexts:
if context.rejected: if context.rejected:
@ -445,23 +460,6 @@ class EventsStore(SQLBaseStore):
to_remove.add(event) to_remove.add(event)
continue continue
# Handle the case of the list including the same event multiple
# times. The tricky thing here is when they differ by whether
# they are an outlier.
if event.event_id in event_map:
other = event_map[event.event_id]
if not other.internal_metadata.is_outlier():
to_remove.add(event)
continue
elif not event.internal_metadata.is_outlier():
to_remove.add(event)
continue
else:
to_remove.add(other)
event_map[event.event_id] = event
if event.event_id not in have_persisted: if event.event_id not in have_persisted:
continue continue