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129 lines
3.6 KiB
129 lines
3.6 KiB
# testing/asyncio.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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# functions and wrappers to run tests, fixtures, provisioning and
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# setup/teardown in an asyncio event loop, conditionally based on the
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# current DB driver being used for a test.
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# note that SQLAlchemy's asyncio integration also supports a method
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# of running individual asyncio functions inside of separate event loops
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# using "async_fallback" mode; however running whole functions in the event
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# loop is a more accurate test for how SQLAlchemy's asyncio features
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# would run in the real world.
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from functools import wraps
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import inspect
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from . import config
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from ..util.concurrency import _util_async_run
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from ..util.concurrency import _util_async_run_coroutine_function
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# may be set to False if the
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# --disable-asyncio flag is passed to the test runner.
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ENABLE_ASYNCIO = True
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def _run_coroutine_function(fn, *args, **kwargs):
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return _util_async_run_coroutine_function(fn, *args, **kwargs)
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def _assume_async(fn, *args, **kwargs):
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"""Run a function in an asyncio loop unconditionally.
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This function is used for provisioning features like
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testing a database connection for server info.
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Note that for blocking IO database drivers, this means they block the
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event loop.
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"""
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if not ENABLE_ASYNCIO:
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return fn(*args, **kwargs)
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return _util_async_run(fn, *args, **kwargs)
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def _maybe_async_provisioning(fn, *args, **kwargs):
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"""Run a function in an asyncio loop if any current drivers might need it.
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This function is used for provisioning features that take
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place outside of a specific database driver being selected, so if the
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current driver that happens to be used for the provisioning operation
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is an async driver, it will run in asyncio and not fail.
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Note that for blocking IO database drivers, this means they block the
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event loop.
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"""
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if not ENABLE_ASYNCIO:
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return fn(*args, **kwargs)
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if config.any_async:
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return _util_async_run(fn, *args, **kwargs)
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else:
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return fn(*args, **kwargs)
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def _maybe_async(fn, *args, **kwargs):
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"""Run a function in an asyncio loop if the current selected driver is
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async.
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This function is used for test setup/teardown and tests themselves
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where the current DB driver is known.
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"""
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if not ENABLE_ASYNCIO:
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return fn(*args, **kwargs)
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is_async = config._current.is_async
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if is_async:
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return _util_async_run(fn, *args, **kwargs)
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else:
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return fn(*args, **kwargs)
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def _maybe_async_wrapper(fn):
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"""Apply the _maybe_async function to an existing function and return
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as a wrapped callable, supporting generator functions as well.
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This is currently used for pytest fixtures that support generator use.
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"""
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if inspect.isgeneratorfunction(fn):
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_stop = object()
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def call_next(gen):
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try:
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return next(gen)
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# can't raise StopIteration in an awaitable.
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except StopIteration:
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return _stop
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@wraps(fn)
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def wrap_fixture(*args, **kwargs):
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gen = fn(*args, **kwargs)
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while True:
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value = _maybe_async(call_next, gen)
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if value is _stop:
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break
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yield value
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else:
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@wraps(fn)
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def wrap_fixture(*args, **kwargs):
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return _maybe_async(fn, *args, **kwargs)
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return wrap_fixture
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