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Clarify when/why we upsert

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This commit is contained in:
Eric Eastwood 2024-08-13 14:47:17 -05:00
parent 32ae162278
commit dc447a673f
1 changed files with 13 additions and 10 deletions
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23
synapse/storage/databases/main/events.py
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@ -1332,6 +1332,9 @@ class PersistEventsStore:
# lists
insert_keys = sliding_sync_membership_snapshots_insert_map.keys()
insert_values = sliding_sync_membership_snapshots_insert_map.values()
# We need to insert/update regardless of whether we have `insert_keys`
# because there are other fields in the `ON CONFLICT` upsert to run (see
# inherit case above for more context when this happens).
txn.execute_batch(
f"""
INSERT INTO sliding_sync_membership_snapshots
@ -1547,9 +1550,10 @@ class PersistEventsStore:
# choose the best possible answer by using the "first" event ID which we
# will assume will have the greatest `stream_ordering`. We really just
# need *some* answer in case we are the first ones inserting into the
# table and in reality, `_store_event_txn()` is run before this function
# so it will already have the correct value. This is just to account for
# things changing in the future.
# table and in reality,
# `_update_sliding_sync_tables_with_new_persisted_events_txn()` is run
# after this function to update it to the correct latest value. This is
# just to account for things changing in the future.
next(iter(to_insert.values())),
]
# If we have a `bump_event_id`, let's update the `bump_stamp` column
@ -1565,7 +1569,11 @@ class PersistEventsStore:
insert_keys = sliding_sync_joined_rooms_insert_map.keys()
insert_values = sliding_sync_joined_rooms_insert_map.values()
args.extend(iter(insert_values))
if len(insert_keys) > 0:
# We only need to update when one of the relevant state values has changed
if insert_keys:
# We don't update `event_stream_ordering` `ON CONFLICT` because it's simpler
# we can just
#
# We don't update `bump_stamp` `ON CONFLICT` because we're dealing with
# state here and the only state event that is also a bump event type is
# `m.room.create`. Given the room creation event is the first one in the
@ -1584,12 +1592,7 @@ class PersistEventsStore:
)
ON CONFLICT (room_id)
DO UPDATE SET
{", ".join(f"{key} = EXCLUDED.{key}" for key in insert_keys)},
event_stream_ordering = CASE
WHEN event_stream_ordering IS NULL OR event_stream_ordering < EXCLUDED.event_stream_ordering
THEN EXCLUDED.event_stream_ordering
ELSE event_stream_ordering
END
{", ".join(f"{key} = EXCLUDED.{key}" for key in insert_keys)}
""",
args,
)