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