67 lines
2.2 KiB
Python
67 lines
2.2 KiB
Python
# Copyright 2021 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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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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