mirror of
https://mau.dev/maunium/synapse.git
synced 2024-08-24 11:16:04 +00:00
167 lines
5.3 KiB
Python
167 lines
5.3 KiB
Python
# Copyright 2020 The Matrix.org Foundation C.I.C.
|
|
#
|
|
# 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.
|
|
from types import TracebackType
|
|
from typing import Any, Iterator, List, Mapping, Optional, Sequence, Tuple, Type, Union
|
|
|
|
from typing_extensions import Protocol
|
|
|
|
"""
|
|
Some very basic protocol definitions for the DB-API2 classes specified in PEP-249
|
|
"""
|
|
|
|
_Parameters = Union[Sequence[Any], Mapping[str, Any]]
|
|
|
|
|
|
class Cursor(Protocol):
|
|
def execute(self, sql: str, parameters: _Parameters = ...) -> Any:
|
|
...
|
|
|
|
def executemany(self, sql: str, parameters: Sequence[_Parameters]) -> Any:
|
|
...
|
|
|
|
def fetchone(self) -> Optional[Tuple]:
|
|
...
|
|
|
|
def fetchmany(self, size: Optional[int] = ...) -> List[Tuple]:
|
|
...
|
|
|
|
def fetchall(self) -> List[Tuple]:
|
|
...
|
|
|
|
@property
|
|
def description(
|
|
self,
|
|
) -> Optional[
|
|
Sequence[
|
|
# Note that this is an approximate typing based on sqlite3 and other
|
|
# drivers, and may not be entirely accurate.
|
|
# FWIW, the DBAPI 2 spec is: https://peps.python.org/pep-0249/#description
|
|
Tuple[
|
|
str,
|
|
Optional[Any],
|
|
Optional[int],
|
|
Optional[int],
|
|
Optional[int],
|
|
Optional[int],
|
|
Optional[int],
|
|
]
|
|
]
|
|
]:
|
|
...
|
|
|
|
@property
|
|
def rowcount(self) -> int:
|
|
return 0
|
|
|
|
def __iter__(self) -> Iterator[Tuple]:
|
|
...
|
|
|
|
def close(self) -> None:
|
|
...
|
|
|
|
|
|
class Connection(Protocol):
|
|
def cursor(self) -> Cursor:
|
|
...
|
|
|
|
def close(self) -> None:
|
|
...
|
|
|
|
def commit(self) -> None:
|
|
...
|
|
|
|
def rollback(self) -> None:
|
|
...
|
|
|
|
def __enter__(self) -> "Connection":
|
|
...
|
|
|
|
def __exit__(
|
|
self,
|
|
exc_type: Optional[Type[BaseException]],
|
|
exc_value: Optional[BaseException],
|
|
traceback: Optional[TracebackType],
|
|
) -> Optional[bool]:
|
|
...
|
|
|
|
|
|
class DBAPI2Module(Protocol):
|
|
"""The module-level attributes that we use from PEP 249.
|
|
|
|
This is NOT a comprehensive stub for the entire DBAPI2."""
|
|
|
|
__name__: str
|
|
|
|
# Exceptions. See https://peps.python.org/pep-0249/#exceptions
|
|
|
|
# For our specific drivers:
|
|
# - Python's sqlite3 module doesn't contains the same descriptions as the
|
|
# DBAPI2 spec, see https://docs.python.org/3/library/sqlite3.html#exceptions
|
|
# - Psycopg2 maps every Postgres error code onto a unique exception class which
|
|
# extends from this hierarchy. See
|
|
# https://docs.python.org/3/library/sqlite3.html?highlight=sqlite3#exceptions
|
|
# https://www.postgresql.org/docs/current/errcodes-appendix.html#ERRCODES-TABLE
|
|
Warning: Type[Exception]
|
|
Error: Type[Exception]
|
|
|
|
# Errors are divided into `InterfaceError`s (something went wrong in the database
|
|
# driver) and `DatabaseError`s (something went wrong in the database). These are
|
|
# both subclasses of `Error`, but we can't currently express this in type
|
|
# annotations due to https://github.com/python/mypy/issues/8397
|
|
InterfaceError: Type[Exception]
|
|
DatabaseError: Type[Exception]
|
|
|
|
# Everything below is a subclass of `DatabaseError`.
|
|
|
|
# Roughly: the database rejected a nonsensical value. Examples:
|
|
# - An integer was too big for its data type.
|
|
# - An invalid date time was provided.
|
|
# - A string contained a null code point.
|
|
DataError: Type[Exception]
|
|
|
|
# Roughly: something went wrong in the database, but it's not within the application
|
|
# programmer's control. Examples:
|
|
# - We failed to establish a connection to the database.
|
|
# - The connection to the database was lost.
|
|
# - A deadlock was detected.
|
|
# - A serialisation failure occurred.
|
|
# - The database ran out of resources, such as storage, memory, connections, etc.
|
|
# - The database encountered an error from the operating system.
|
|
OperationalError: Type[Exception]
|
|
|
|
# Roughly: we've given the database data which breaks a rule we asked it to enforce.
|
|
# Examples:
|
|
# - Stop, criminal scum! You violated the foreign key constraint
|
|
# - Also check constraints, non-null constraints, etc.
|
|
IntegrityError: Type[Exception]
|
|
|
|
# Roughly: something went wrong within the database server itself.
|
|
InternalError: Type[Exception]
|
|
|
|
# Roughly: the application did something silly that needs to be fixed. Examples:
|
|
# - We don't have permissions to do something.
|
|
# - We tried to create a table with duplicate column names.
|
|
# - We tried to use a reserved name.
|
|
# - We referred to a column that doesn't exist.
|
|
ProgrammingError: Type[Exception]
|
|
|
|
# Roughly: we've tried to do something that this database doesn't support.
|
|
NotSupportedError: Type[Exception]
|
|
|
|
def connect(self, **parameters: object) -> Connection:
|
|
...
|
|
|
|
|
|
__all__ = ["Cursor", "Connection", "DBAPI2Module"]
|