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ae5b2a72c0
We call `_update_stream_positions_table_txn` a lot, which is an UPSERT that can conflict in `REPEATABLE READ` isolation level. Instead of doing a transaction consisting of a single query we may as well run it outside of a transaction.
117 lines
3.1 KiB
Python
117 lines
3.1 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015, 2016 OpenMarket Ltd
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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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import abc
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from typing import Generic, TypeVar
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from synapse.storage.types import Connection
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class IncorrectDatabaseSetup(RuntimeError):
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pass
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ConnectionType = TypeVar("ConnectionType", bound=Connection)
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class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
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def __init__(self, module, database_config: dict):
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self.module = module
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@property
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@abc.abstractmethod
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def single_threaded(self) -> bool:
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...
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@property
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@abc.abstractmethod
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def can_native_upsert(self) -> bool:
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"""
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Do we support native UPSERTs?
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"""
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...
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@property
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@abc.abstractmethod
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def supports_tuple_comparison(self) -> bool:
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"""
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Do we support comparing tuples, i.e. `(a, b) > (c, d)`?
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"""
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...
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@property
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@abc.abstractmethod
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def supports_using_any_list(self) -> bool:
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"""
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Do we support using `a = ANY(?)` and passing a list
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"""
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...
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@abc.abstractmethod
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def check_database(
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self, db_conn: ConnectionType, allow_outdated_version: bool = False
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) -> None:
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...
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@abc.abstractmethod
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def check_new_database(self, txn) -> None:
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"""Gets called when setting up a brand new database. This allows us to
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apply stricter checks on new databases versus existing database.
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"""
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...
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@abc.abstractmethod
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def convert_param_style(self, sql: str) -> str:
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...
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@abc.abstractmethod
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def on_new_connection(self, db_conn: ConnectionType) -> None:
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...
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@abc.abstractmethod
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def is_deadlock(self, error: Exception) -> bool:
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...
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@abc.abstractmethod
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def is_connection_closed(self, conn: ConnectionType) -> bool:
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...
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@abc.abstractmethod
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def lock_table(self, txn, table: str) -> None:
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...
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@property
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@abc.abstractmethod
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def server_version(self) -> str:
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"""Gets a string giving the server version. For example: '3.22.0'
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"""
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...
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@abc.abstractmethod
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def in_transaction(self, conn: Connection) -> bool:
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"""Whether the connection is currently in a transaction.
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"""
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...
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@abc.abstractmethod
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def attempt_to_set_autocommit(self, conn: Connection, autocommit: bool):
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"""Attempt to set the connections autocommit mode.
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When True queries are run outside of transactions.
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Note: This has no effect on SQLite3, so callers still need to
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commit/rollback the connections.
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"""
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...
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