2022-03-01 12:49:54 +00:00
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#
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2023-11-21 20:29:58 +00:00
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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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2024-01-23 11:26:48 +00:00
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# Copyright 2022 The Matrix.org Foundation C.I.C.
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2023-11-21 20:29:58 +00:00
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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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2022-03-01 12:49:54 +00:00
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#
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#
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"""
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This migration adds triggers to the partial_state_events tables to enforce uniqueness
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Triggers cannot be expressed in .sql files, so we have to use a separate file.
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"""
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2023-04-27 12:44:53 +00:00
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from synapse.storage.database import LoggingTransaction
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2022-03-01 12:49:54 +00:00
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from synapse.storage.engines import BaseDatabaseEngine, PostgresEngine, Sqlite3Engine
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2023-04-27 12:44:53 +00:00
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def run_create(cur: LoggingTransaction, database_engine: BaseDatabaseEngine) -> None:
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2022-03-01 12:49:54 +00:00
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# complain if the room_id in partial_state_events doesn't match
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# that in `events`. We already have a fk constraint which ensures that the event
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# exists in `events`, so all we have to do is raise if there is a row with a
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# matching stream_ordering but not a matching room_id.
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if isinstance(database_engine, Sqlite3Engine):
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cur.execute(
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"""
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CREATE TRIGGER IF NOT EXISTS partial_state_events_bad_room_id
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BEFORE INSERT ON partial_state_events
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FOR EACH ROW
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BEGIN
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SELECT RAISE(ABORT, 'Incorrect room_id in partial_state_events')
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WHERE EXISTS (
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SELECT 1 FROM events
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WHERE events.event_id = NEW.event_id
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AND events.room_id != NEW.room_id
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);
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END;
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"""
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)
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elif isinstance(database_engine, PostgresEngine):
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cur.execute(
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"""
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CREATE OR REPLACE FUNCTION check_partial_state_events() RETURNS trigger AS $BODY$
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BEGIN
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IF EXISTS (
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SELECT 1 FROM events
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WHERE events.event_id = NEW.event_id
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AND events.room_id != NEW.room_id
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) THEN
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RAISE EXCEPTION 'Incorrect room_id in partial_state_events';
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END IF;
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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 check_partial_state_events BEFORE INSERT OR UPDATE ON partial_state_events
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FOR EACH ROW
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EXECUTE PROCEDURE check_partial_state_events()
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"""
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)
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else:
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raise NotImplementedError("Unknown database engine")
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