127 lines
3.8 KiB
Python
127 lines
3.8 KiB
Python
# Copyright 2015, 2016 OpenMarket Ltd
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
import abc
|
|
from enum import IntEnum
|
|
from typing import TYPE_CHECKING, Any, Generic, Mapping, Optional, TypeVar
|
|
|
|
from synapse.storage.types import Connection, Cursor, DBAPI2Module
|
|
|
|
if TYPE_CHECKING:
|
|
from synapse.storage.database import LoggingDatabaseConnection
|
|
|
|
|
|
class IsolationLevel(IntEnum):
|
|
READ_COMMITTED: int = 1
|
|
REPEATABLE_READ: int = 2
|
|
SERIALIZABLE: int = 3
|
|
|
|
|
|
class IncorrectDatabaseSetup(RuntimeError):
|
|
pass
|
|
|
|
|
|
ConnectionType = TypeVar("ConnectionType", bound=Connection)
|
|
|
|
|
|
class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
|
|
def __init__(self, module: DBAPI2Module, config: Mapping[str, Any]):
|
|
self.module = module
|
|
|
|
@property
|
|
@abc.abstractmethod
|
|
def single_threaded(self) -> bool:
|
|
...
|
|
|
|
@property
|
|
@abc.abstractmethod
|
|
def supports_using_any_list(self) -> bool:
|
|
"""
|
|
Do we support using `a = ANY(?)` and passing a list
|
|
"""
|
|
...
|
|
|
|
@property
|
|
@abc.abstractmethod
|
|
def supports_returning(self) -> bool:
|
|
"""Do we support the `RETURNING` clause in insert/update/delete?"""
|
|
...
|
|
|
|
@abc.abstractmethod
|
|
def check_database(
|
|
self, db_conn: ConnectionType, allow_outdated_version: bool = False
|
|
) -> None:
|
|
...
|
|
|
|
@abc.abstractmethod
|
|
def check_new_database(self, txn: Cursor) -> None:
|
|
"""Gets called when setting up a brand new database. This allows us to
|
|
apply stricter checks on new databases versus existing database.
|
|
"""
|
|
...
|
|
|
|
@abc.abstractmethod
|
|
def convert_param_style(self, sql: str) -> str:
|
|
...
|
|
|
|
# This method would ideally take a plain ConnectionType, but it seems that
|
|
# the Sqlite engine expects to use LoggingDatabaseConnection.cursor
|
|
# instead of sqlite3.Connection.cursor: only the former takes a txn_name.
|
|
@abc.abstractmethod
|
|
def on_new_connection(self, db_conn: "LoggingDatabaseConnection") -> None:
|
|
...
|
|
|
|
@abc.abstractmethod
|
|
def is_deadlock(self, error: Exception) -> bool:
|
|
...
|
|
|
|
@abc.abstractmethod
|
|
def is_connection_closed(self, conn: ConnectionType) -> bool:
|
|
...
|
|
|
|
@abc.abstractmethod
|
|
def lock_table(self, txn: Cursor, table: str) -> None:
|
|
...
|
|
|
|
@property
|
|
@abc.abstractmethod
|
|
def server_version(self) -> str:
|
|
"""Gets a string giving the server version. For example: '3.22.0'"""
|
|
...
|
|
|
|
@abc.abstractmethod
|
|
def in_transaction(self, conn: ConnectionType) -> bool:
|
|
"""Whether the connection is currently in a transaction."""
|
|
...
|
|
|
|
@abc.abstractmethod
|
|
def attempt_to_set_autocommit(self, conn: ConnectionType, autocommit: bool) -> None:
|
|
"""Attempt to set the connections autocommit mode.
|
|
|
|
When True queries are run outside of transactions.
|
|
|
|
Note: This has no effect on SQLite3, so callers still need to
|
|
commit/rollback the connections.
|
|
"""
|
|
...
|
|
|
|
@abc.abstractmethod
|
|
def attempt_to_set_isolation_level(
|
|
self, conn: ConnectionType, isolation_level: Optional[int]
|
|
) -> None:
|
|
"""Attempt to set the connections isolation level.
|
|
|
|
Note: This has no effect on SQLite3, as transactions are SERIALIZABLE by default.
|
|
"""
|
|
...
|