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During the migration the automated script to update the copyright headers accidentally got rid of some of the existing copyright lines. Reinstate them.
212 lines
6.5 KiB
Python
212 lines
6.5 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 2020 The Matrix.org Foundation C.I.C.
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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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from types import TracebackType
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from typing import (
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Any,
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Callable,
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Iterator,
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List,
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Mapping,
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Optional,
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Sequence,
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Tuple,
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Type,
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Union,
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)
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from typing_extensions import Protocol
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"""
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Some very basic protocol definitions for the DB-API2 classes specified in PEP-249
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"""
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SQLQueryParameters = Union[Sequence[Any], Mapping[str, Any]]
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class Cursor(Protocol):
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def execute(self, sql: str, parameters: SQLQueryParameters = ...) -> Any:
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...
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def executemany(self, sql: str, parameters: Sequence[SQLQueryParameters]) -> Any:
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...
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def fetchone(self) -> Optional[Tuple]:
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...
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def fetchmany(self, size: Optional[int] = ...) -> List[Tuple]:
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...
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def fetchall(self) -> List[Tuple]:
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...
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@property
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def description(
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self,
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) -> Optional[Sequence[Any]]:
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# At the time of writing, Synapse only assumes that `column[0]: str` for each
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# `column in description`. Since this is hard to express in the type system, and
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# as this is rarely used in Synapse, we deem `column: Any` good enough.
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...
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@property
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def rowcount(self) -> int:
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return 0
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def __iter__(self) -> Iterator[Tuple]:
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...
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def close(self) -> None:
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...
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class Connection(Protocol):
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def cursor(self) -> Cursor:
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...
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def close(self) -> None:
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...
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def commit(self) -> None:
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...
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def rollback(self) -> None:
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...
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def __enter__(self) -> "Connection":
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...
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def __exit__(
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self,
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exc_type: Optional[Type[BaseException]],
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exc_value: Optional[BaseException],
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traceback: Optional[TracebackType],
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) -> Optional[bool]:
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...
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class DBAPI2Module(Protocol):
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"""The module-level attributes that we use from PEP 249.
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This is NOT a comprehensive stub for the entire DBAPI2."""
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__name__: str
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# Exceptions. See https://peps.python.org/pep-0249/#exceptions
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# For our specific drivers:
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# - Python's sqlite3 module doesn't contains the same descriptions as the
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# DBAPI2 spec, see https://docs.python.org/3/library/sqlite3.html#exceptions
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# - Psycopg2 maps every Postgres error code onto a unique exception class which
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# extends from this hierarchy. See
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# https://docs.python.org/3/library/sqlite3.html?highlight=sqlite3#exceptions
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# https://www.postgresql.org/docs/current/errcodes-appendix.html#ERRCODES-TABLE
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#
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# Note: rather than
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# x: T
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# we write
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# @property
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# def x(self) -> T: ...
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# which expresses that the protocol attribute `x` is read-only. The mypy docs
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# https://mypy.readthedocs.io/en/latest/common_issues.html#covariant-subtyping-of-mutable-protocol-members-is-rejected
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# explain why this is necessary for safety. TL;DR: we shouldn't be able to write
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# to `x`, only read from it. See also https://github.com/python/mypy/issues/6002 .
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@property
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def Warning(self) -> Type[Exception]:
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...
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@property
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def Error(self) -> Type[Exception]:
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...
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# Errors are divided into `InterfaceError`s (something went wrong in the database
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# driver) and `DatabaseError`s (something went wrong in the database). These are
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# both subclasses of `Error`, but we can't currently express this in type
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# annotations due to https://github.com/python/mypy/issues/8397
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@property
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def InterfaceError(self) -> Type[Exception]:
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...
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@property
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def DatabaseError(self) -> Type[Exception]:
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...
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# Everything below is a subclass of `DatabaseError`.
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# Roughly: the database rejected a nonsensical value. Examples:
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# - An integer was too big for its data type.
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# - An invalid date time was provided.
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# - A string contained a null code point.
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@property
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def DataError(self) -> Type[Exception]:
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...
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# Roughly: something went wrong in the database, but it's not within the application
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# programmer's control. Examples:
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# - We failed to establish a connection to the database.
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# - The connection to the database was lost.
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# - A deadlock was detected.
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# - A serialisation failure occurred.
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# - The database ran out of resources, such as storage, memory, connections, etc.
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# - The database encountered an error from the operating system.
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@property
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def OperationalError(self) -> Type[Exception]:
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...
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# Roughly: we've given the database data which breaks a rule we asked it to enforce.
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# Examples:
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# - Stop, criminal scum! You violated the foreign key constraint
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# - Also check constraints, non-null constraints, etc.
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@property
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def IntegrityError(self) -> Type[Exception]:
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...
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# Roughly: something went wrong within the database server itself.
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@property
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def InternalError(self) -> Type[Exception]:
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...
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# Roughly: the application did something silly that needs to be fixed. Examples:
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# - We don't have permissions to do something.
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# - We tried to create a table with duplicate column names.
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# - We tried to use a reserved name.
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# - We referred to a column that doesn't exist.
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@property
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def ProgrammingError(self) -> Type[Exception]:
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...
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# Roughly: we've tried to do something that this database doesn't support.
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@property
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def NotSupportedError(self) -> Type[Exception]:
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...
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# We originally wrote
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# def connect(self, *args, **kwargs) -> Connection: ...
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# But mypy doesn't seem to like that because sqlite3.connect takes a mandatory
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# positional argument. We can't make that part of the signature though, because
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# psycopg2.connect doesn't have a mandatory positional argument. Instead, we use
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# the following slightly unusual workaround.
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@property
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def connect(self) -> Callable[..., Connection]:
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...
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__all__ = ["Cursor", "Connection", "DBAPI2Module"]
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