73 lines
2.8 KiB
Python
73 lines
2.8 KiB
Python
# Copyright 2022 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 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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from synapse.storage.database import LoggingTransaction
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from synapse.storage.engines import BaseDatabaseEngine, PostgresEngine, Sqlite3Engine
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def run_create(cur: LoggingTransaction, database_engine: BaseDatabaseEngine) -> None:
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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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