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74 lines
2.2 KiB
74 lines
2.2 KiB
3 years ago
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# util/concurrency.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 . import compat
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have_greenlet = False
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greenlet_error = None
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if compat.py3k:
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try:
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import greenlet # noqa: F401
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except ImportError as e:
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greenlet_error = str(e)
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else:
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have_greenlet = True
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from ._concurrency_py3k import await_only
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from ._concurrency_py3k import await_fallback
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from ._concurrency_py3k import greenlet_spawn
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from ._concurrency_py3k import is_exit_exception
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from ._concurrency_py3k import AsyncAdaptedLock
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from ._concurrency_py3k import _util_async_run # noqa: F401
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from ._concurrency_py3k import (
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_util_async_run_coroutine_function,
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) # noqa: F401, E501
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from ._concurrency_py3k import asyncio # noqa: F401
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# does not need greennlet, just Python 3
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from ._compat_py3k import asynccontextmanager # noqa: F401
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if not have_greenlet:
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asyncio = None # noqa: F811
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def _not_implemented():
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# this conditional is to prevent pylance from considering
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# greenlet_spawn() etc as "no return" and dimming out code below it
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if have_greenlet:
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return None
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if not compat.py3k:
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raise ValueError("Cannot use this function in py2.")
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else:
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raise ValueError(
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"the greenlet library is required to use this function."
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" %s" % greenlet_error
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if greenlet_error
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else ""
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)
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def is_exit_exception(e): # noqa: F811
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return not isinstance(e, Exception)
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def await_only(thing): # noqa: F811
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_not_implemented()
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def await_fallback(thing): # noqa: F811
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return thing
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def greenlet_spawn(fn, *args, **kw): # noqa: F811
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_not_implemented()
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def AsyncAdaptedLock(*args, **kw): # noqa: F811
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_not_implemented()
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def _util_async_run(fn, *arg, **kw): # noqa: F811
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return fn(*arg, **kw)
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def _util_async_run_coroutine_function(fn, *arg, **kw): # noqa: F811
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_not_implemented()
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