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108 lines
2.9 KiB
108 lines
2.9 KiB
3 years ago
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# ext/asyncio/scoping.py
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# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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from .session import AsyncSession
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from ...orm.scoping import ScopedSessionMixin
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from ...util import create_proxy_methods
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from ...util import ScopedRegistry
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@create_proxy_methods(
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AsyncSession,
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":class:`_asyncio.AsyncSession`",
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":class:`_asyncio.scoping.async_scoped_session`",
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classmethods=["close_all", "object_session", "identity_key"],
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methods=[
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"__contains__",
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"__iter__",
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"add",
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"add_all",
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"begin",
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"begin_nested",
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"close",
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"commit",
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"connection",
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"delete",
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"execute",
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"expire",
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"expire_all",
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"expunge",
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"expunge_all",
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"flush",
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"get",
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"get_bind",
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"is_modified",
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"invalidate",
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"merge",
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"refresh",
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"rollback",
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"scalar",
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"scalars",
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"stream",
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"stream_scalars",
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],
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attributes=[
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"bind",
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"dirty",
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"deleted",
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"new",
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"identity_map",
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"is_active",
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"autoflush",
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"no_autoflush",
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"info",
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],
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)
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class async_scoped_session(ScopedSessionMixin):
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"""Provides scoped management of :class:`.AsyncSession` objects.
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See the section :ref:`asyncio_scoped_session` for usage details.
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.. versionadded:: 1.4.19
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"""
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_support_async = True
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def __init__(self, session_factory, scopefunc):
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"""Construct a new :class:`_asyncio.async_scoped_session`.
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:param session_factory: a factory to create new :class:`_asyncio.AsyncSession`
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instances. This is usually, but not necessarily, an instance
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of :class:`_orm.sessionmaker` which itself was passed the
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:class:`_asyncio.AsyncSession` to its :paramref:`_orm.sessionmaker.class_`
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parameter::
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async_session_factory = sessionmaker(some_async_engine, class_= AsyncSession)
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AsyncSession = async_scoped_session(async_session_factory, scopefunc=current_task)
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:param scopefunc: function which defines
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the current scope. A function such as ``asyncio.current_task``
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may be useful here.
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""" # noqa: E501
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self.session_factory = session_factory
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self.registry = ScopedRegistry(session_factory, scopefunc)
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@property
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def _proxied(self):
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return self.registry()
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async def remove(self):
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"""Dispose of the current :class:`.AsyncSession`, if present.
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Different from scoped_session's remove method, this method would use
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await to wait for the close method of AsyncSession.
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"""
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if self.registry.has():
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await self.registry().close()
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self.registry.clear()
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