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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2021 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
"""
This migration handles the process of changing the type of `room_depth.min_depth` to
a BIGINT.
"""
from synapse.storage.database import LoggingTransaction
from synapse.storage.engines import BaseDatabaseEngine, PostgresEngine
def run_create(cur: LoggingTransaction, database_engine: BaseDatabaseEngine) -> None:
if not isinstance(database_engine, PostgresEngine):
# this only applies to postgres - sqlite does not distinguish between big and
# little ints.
return
# First add a new column to contain the bigger min_depth
cur.execute("ALTER TABLE room_depth ADD COLUMN min_depth2 BIGINT")
# Create a trigger which will keep it populated.
cur.execute(
"""
CREATE OR REPLACE FUNCTION populate_min_depth2() RETURNS trigger AS $BODY$
BEGIN
new.min_depth2 := new.min_depth;
RETURN NEW;
END;
$BODY$ LANGUAGE plpgsql
"""
)
cur.execute(
"""
CREATE TRIGGER populate_min_depth2_trigger BEFORE INSERT OR UPDATE ON room_depth
FOR EACH ROW
EXECUTE PROCEDURE populate_min_depth2()
"""
)
# Start a bg process to populate it for old rooms
cur.execute(
"""
INSERT INTO background_updates (ordering, update_name, progress_json) VALUES
(6103, 'populate_room_depth_min_depth2', '{}')
"""
)
# and another to switch them over once it completes.
cur.execute(
"""
INSERT INTO background_updates (ordering, update_name, progress_json, depends_on) VALUES
(6103, 'replace_room_depth_min_depth', '{}', 'populate_room_depth2')
"""
)
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