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23740eaa3d
During the migration the automated script to update the copyright headers accidentally got rid of some of the existing copyright lines. Reinstate them.
55 lines
1.9 KiB
Python
55 lines
1.9 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 2022 Beeper
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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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Adds a postgres SEQUENCE for generating application service transaction IDs.
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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 isinstance(database_engine, PostgresEngine):
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# If we already have some AS TXNs we want to start from the current
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# maximum value. There are two potential places this is stored - the
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# actual TXNs themselves *and* the AS state table. At time of migration
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# it is possible the TXNs table is empty so we must include the AS state
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# last_txn as a potential option, and pick the maximum.
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cur.execute("SELECT COALESCE(max(txn_id), 0) FROM application_services_txns")
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row = cur.fetchone()
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assert row is not None
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txn_max = row[0]
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cur.execute("SELECT COALESCE(max(last_txn), 0) FROM application_services_state")
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row = cur.fetchone()
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assert row is not None
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last_txn_max = row[0]
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start_val = max(last_txn_max, txn_max) + 1
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cur.execute(
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"CREATE SEQUENCE application_services_txn_id_seq START WITH %s",
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(start_val,),
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)
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