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# engine/util.py # Copyright (C) 2005-2024 the SQLAlchemy authors and contributors # <see AUTHORS file> # # This module is part of SQLAlchemy and is released under # the MIT License: https://www.opensource.org/licenses/mit-license.php from __future__ import annotations import typing from typing import Any from typing import Callable from typing import Optional from typing import TypeVar from .. import exc from .. import util from ..util._has_cy import HAS_CYEXTENSION from ..util.typing import Protocol from ..util.typing import Self if typing.TYPE_CHECKING or not HAS_CYEXTENSION: from ._py_util import _distill_params_20 as _distill_params_20 from ._py_util import _distill_raw_params as _distill_raw_params else: from sqlalchemy.cyextension.util import ( # noqa: F401 _distill_params_20 as _distill_params_20, ) from sqlalchemy.cyextension.util import ( # noqa: F401 _distill_raw_params as _distill_raw_params, ) _C = TypeVar("_C", bound=Callable[[], Any]) def connection_memoize(key: str) -> Callable[[_C], _C]: """Decorator, memoize a function in a connection.info stash. Only applicable to functions which take no arguments other than a connection. The memo will be stored in ``connection.info[key]``. """ @util.decorator def decorated(fn, self, connection): # type: ignore connection = connection.connect() try: return connection.info[key] except KeyError: connection.info[key] = val = fn(self, connection) return val return decorated class _TConsSubject(Protocol): _trans_context_manager: Optional[TransactionalContext] class TransactionalContext: """Apply Python context manager behavior to transaction objects. Performs validation to ensure the subject of the transaction is not used if the transaction were ended prematurely. """ __slots__ = ("_outer_trans_ctx", "_trans_subject", "__weakref__") _trans_subject: Optional[_TConsSubject] def _transaction_is_active(self) -> bool: raise NotImplementedError() def _transaction_is_closed(self) -> bool: raise NotImplementedError() def _rollback_can_be_called(self) -> bool: """indicates the object is in a state that is known to be acceptable for rollback() to be called. This does not necessarily mean rollback() will succeed or not raise an error, just that there is currently no state detected that indicates rollback() would fail or emit warnings. It also does not mean that there's a transaction in progress, as it is usually safe to call rollback() even if no transaction is present. .. versionadded:: 1.4.28 """ raise NotImplementedError() def _get_subject(self) -> _TConsSubject: raise NotImplementedError() def commit(self) -> None: raise NotImplementedError() def rollback(self) -> None: raise NotImplementedError() def close(self) -> None: raise NotImplementedError() @classmethod def _trans_ctx_check(cls, subject: _TConsSubject) -> None: trans_context = subject._trans_context_manager if trans_context: if not trans_context._transaction_is_active(): raise exc.InvalidRequestError( "Can't operate on closed transaction inside context " "manager. Please complete the context manager " "before emitting further commands." ) def __enter__(self) -> Self: subject = self._get_subject() # none for outer transaction, may be non-None for nested # savepoint, legacy nesting cases trans_context = subject._trans_context_manager self._outer_trans_ctx = trans_context self._trans_subject = subject subject._trans_context_manager = self return self def __exit__(self, type_: Any, value: Any, traceback: Any) -> None: subject = getattr(self, "_trans_subject", None) # simplistically we could assume that # "subject._trans_context_manager is self". However, any calling # code that is manipulating __exit__ directly would break this # assumption. alembic context manager # is an example of partial use that just calls __exit__ and # not __enter__ at the moment. it's safe to assume this is being done # in the wild also out_of_band_exit = ( subject is None or subject._trans_context_manager is not self ) if type_ is None and self._transaction_is_active(): try: self.commit() except: with util.safe_reraise(): if self._rollback_can_be_called(): self.rollback() finally: if not out_of_band_exit: assert subject is not None subject._trans_context_manager = self._outer_trans_ctx self._trans_subject = self._outer_trans_ctx = None else: try: if not self._transaction_is_active(): if not self._transaction_is_closed(): self.close() else: if self._rollback_can_be_called(): self.rollback() finally: if not out_of_band_exit: assert subject is not None subject._trans_context_manager = self._outer_trans_ctx self._trans_subject = self._outer_trans_ctx = None
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