mirror of https://github.com/python/cpython
bpo-46994: Accept explicit contextvars.Context in asyncio create_task() API (GH-31837)
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@ -330,7 +330,7 @@ Creating Futures and Tasks
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.. versionadded:: 3.5.2
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.. method:: loop.create_task(coro, *, name=None)
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.. method:: loop.create_task(coro, *, name=None, context=None)
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Schedule the execution of a :ref:`coroutine`.
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Return a :class:`Task` object.
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@ -342,9 +342,16 @@ Creating Futures and Tasks
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If the *name* argument is provided and not ``None``, it is set as
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the name of the task using :meth:`Task.set_name`.
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An optional keyword-only *context* argument allows specifying a
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custom :class:`contextvars.Context` for the *coro* to run in.
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The current context copy is created when no *context* is provided.
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.. versionchanged:: 3.8
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Added the *name* parameter.
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.. versionchanged:: 3.11
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Added the *context* parameter.
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.. method:: loop.set_task_factory(factory)
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Set a task factory that will be used by
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@ -352,7 +359,7 @@ Creating Futures and Tasks
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If *factory* is ``None`` the default task factory will be set.
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Otherwise, *factory* must be a *callable* with the signature matching
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``(loop, coro)``, where *loop* is a reference to the active
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``(loop, coro, context=None)``, where *loop* is a reference to the active
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event loop, and *coro* is a coroutine object. The callable
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must return a :class:`asyncio.Future`-compatible object.
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@ -244,7 +244,7 @@ Running an asyncio Program
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Creating Tasks
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==============
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.. function:: create_task(coro, *, name=None)
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.. function:: create_task(coro, *, name=None, context=None)
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Wrap the *coro* :ref:`coroutine <coroutine>` into a :class:`Task`
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and schedule its execution. Return the Task object.
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@ -252,6 +252,10 @@ Creating Tasks
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If *name* is not ``None``, it is set as the name of the task using
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:meth:`Task.set_name`.
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An optional keyword-only *context* argument allows specifying a
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custom :class:`contextvars.Context` for the *coro* to run in.
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The current context copy is created when no *context* is provided.
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The task is executed in the loop returned by :func:`get_running_loop`,
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:exc:`RuntimeError` is raised if there is no running loop in
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current thread.
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@ -281,6 +285,9 @@ Creating Tasks
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.. versionchanged:: 3.8
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Added the *name* parameter.
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.. versionchanged:: 3.11
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Added the *context* parameter.
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Sleeping
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========
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@ -426,18 +426,23 @@ class BaseEventLoop(events.AbstractEventLoop):
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"""Create a Future object attached to the loop."""
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return futures.Future(loop=self)
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def create_task(self, coro, *, name=None):
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def create_task(self, coro, *, name=None, context=None):
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"""Schedule a coroutine object.
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Return a task object.
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"""
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self._check_closed()
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if self._task_factory is None:
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task = tasks.Task(coro, loop=self, name=name)
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task = tasks.Task(coro, loop=self, name=name, context=context)
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if task._source_traceback:
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del task._source_traceback[-1]
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else:
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task = self._task_factory(self, coro)
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if context is None:
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# Use legacy API if context is not needed
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task = self._task_factory(self, coro)
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else:
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task = self._task_factory(self, coro, context=context)
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tasks._set_task_name(task, name)
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return task
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@ -274,7 +274,7 @@ class AbstractEventLoop:
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# Method scheduling a coroutine object: create a task.
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def create_task(self, coro, *, name=None):
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def create_task(self, coro, *, name=None, context=None):
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raise NotImplementedError
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# Methods for interacting with threads.
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@ -138,12 +138,15 @@ class TaskGroup:
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me = BaseExceptionGroup('unhandled errors in a TaskGroup', errors)
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raise me from None
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def create_task(self, coro, *, name=None):
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def create_task(self, coro, *, name=None, context=None):
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if not self._entered:
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raise RuntimeError(f"TaskGroup {self!r} has not been entered")
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if self._exiting and self._unfinished_tasks == 0:
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raise RuntimeError(f"TaskGroup {self!r} is finished")
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task = self._loop.create_task(coro)
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if context is None:
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task = self._loop.create_task(coro)
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else:
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task = self._loop.create_task(coro, context=context)
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tasks._set_task_name(task, name)
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task.add_done_callback(self._on_task_done)
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self._unfinished_tasks += 1
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@ -93,7 +93,7 @@ class Task(futures._PyFuture): # Inherit Python Task implementation
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# status is still pending
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_log_destroy_pending = True
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def __init__(self, coro, *, loop=None, name=None):
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def __init__(self, coro, *, loop=None, name=None, context=None):
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super().__init__(loop=loop)
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if self._source_traceback:
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del self._source_traceback[-1]
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@ -112,7 +112,10 @@ class Task(futures._PyFuture): # Inherit Python Task implementation
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self._must_cancel = False
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self._fut_waiter = None
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self._coro = coro
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self._context = contextvars.copy_context()
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if context is None:
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self._context = contextvars.copy_context()
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else:
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self._context = context
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self._loop.call_soon(self.__step, context=self._context)
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_register_task(self)
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@ -360,13 +363,18 @@ else:
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Task = _CTask = _asyncio.Task
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def create_task(coro, *, name=None):
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def create_task(coro, *, name=None, context=None):
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"""Schedule the execution of a coroutine object in a spawn task.
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Return a Task object.
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"""
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loop = events.get_running_loop()
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task = loop.create_task(coro)
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if context is None:
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# Use legacy API if context is not needed
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task = loop.create_task(coro)
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else:
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task = loop.create_task(coro, context=context)
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_set_task_name(task, name)
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return task
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@ -2,6 +2,7 @@
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import asyncio
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import contextvars
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from asyncio import taskgroups
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import unittest
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@ -708,6 +709,23 @@ class TestTaskGroup(unittest.IsolatedAsyncioTestCase):
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t = g.create_task(coro(), name="yolo")
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self.assertEqual(t.get_name(), "yolo")
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async def test_taskgroup_task_context(self):
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cvar = contextvars.ContextVar('cvar')
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async def coro(val):
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await asyncio.sleep(0)
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cvar.set(val)
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async with taskgroups.TaskGroup() as g:
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ctx = contextvars.copy_context()
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self.assertIsNone(ctx.get(cvar))
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t1 = g.create_task(coro(1), context=ctx)
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await t1
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self.assertEqual(1, ctx.get(cvar))
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t2 = g.create_task(coro(2), context=ctx)
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await t2
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self.assertEqual(2, ctx.get(cvar))
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if __name__ == "__main__":
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unittest.main()
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@ -95,8 +95,8 @@ class BaseTaskTests:
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Task = None
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Future = None
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def new_task(self, loop, coro, name='TestTask'):
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return self.__class__.Task(coro, loop=loop, name=name)
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def new_task(self, loop, coro, name='TestTask', context=None):
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return self.__class__.Task(coro, loop=loop, name=name, context=context)
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def new_future(self, loop):
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return self.__class__.Future(loop=loop)
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@ -2527,6 +2527,90 @@ class BaseTaskTests:
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self.assertEqual(cvar.get(), -1)
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def test_context_4(self):
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cvar = contextvars.ContextVar('cvar')
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async def coro(val):
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await asyncio.sleep(0)
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cvar.set(val)
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async def main():
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ret = []
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ctx = contextvars.copy_context()
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ret.append(ctx.get(cvar))
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t1 = self.new_task(loop, coro(1), context=ctx)
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await t1
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ret.append(ctx.get(cvar))
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t2 = self.new_task(loop, coro(2), context=ctx)
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await t2
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ret.append(ctx.get(cvar))
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return ret
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loop = asyncio.new_event_loop()
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try:
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task = self.new_task(loop, main())
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ret = loop.run_until_complete(task)
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finally:
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loop.close()
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self.assertEqual([None, 1, 2], ret)
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def test_context_5(self):
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cvar = contextvars.ContextVar('cvar')
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async def coro(val):
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await asyncio.sleep(0)
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cvar.set(val)
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async def main():
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ret = []
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ctx = contextvars.copy_context()
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ret.append(ctx.get(cvar))
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t1 = asyncio.create_task(coro(1), context=ctx)
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await t1
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ret.append(ctx.get(cvar))
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t2 = asyncio.create_task(coro(2), context=ctx)
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await t2
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ret.append(ctx.get(cvar))
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return ret
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loop = asyncio.new_event_loop()
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try:
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task = self.new_task(loop, main())
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ret = loop.run_until_complete(task)
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finally:
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loop.close()
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self.assertEqual([None, 1, 2], ret)
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def test_context_6(self):
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cvar = contextvars.ContextVar('cvar')
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async def coro(val):
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await asyncio.sleep(0)
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cvar.set(val)
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async def main():
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ret = []
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ctx = contextvars.copy_context()
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ret.append(ctx.get(cvar))
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t1 = loop.create_task(coro(1), context=ctx)
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await t1
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ret.append(ctx.get(cvar))
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t2 = loop.create_task(coro(2), context=ctx)
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await t2
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ret.append(ctx.get(cvar))
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return ret
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loop = asyncio.new_event_loop()
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try:
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task = loop.create_task(main())
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ret = loop.run_until_complete(task)
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finally:
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loop.close()
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self.assertEqual([None, 1, 2], ret)
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def test_get_coro(self):
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loop = asyncio.new_event_loop()
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coro = coroutine_function()
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@ -1,4 +1,5 @@
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import asyncio
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import contextvars
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import inspect
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import warnings
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@ -34,7 +35,7 @@ class IsolatedAsyncioTestCase(TestCase):
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def __init__(self, methodName='runTest'):
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super().__init__(methodName)
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self._asyncioTestLoop = None
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self._asyncioCallsQueue = None
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self._asyncioTestContext = contextvars.copy_context()
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async def asyncSetUp(self):
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pass
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@ -58,7 +59,7 @@ class IsolatedAsyncioTestCase(TestCase):
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self.addCleanup(*(func, *args), **kwargs)
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def _callSetUp(self):
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self.setUp()
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self._asyncioTestContext.run(self.setUp)
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self._callAsync(self.asyncSetUp)
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def _callTestMethod(self, method):
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@ -68,47 +69,30 @@ class IsolatedAsyncioTestCase(TestCase):
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def _callTearDown(self):
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self._callAsync(self.asyncTearDown)
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self.tearDown()
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self._asyncioTestContext.run(self.tearDown)
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def _callCleanup(self, function, *args, **kwargs):
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self._callMaybeAsync(function, *args, **kwargs)
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def _callAsync(self, func, /, *args, **kwargs):
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assert self._asyncioTestLoop is not None, 'asyncio test loop is not initialized'
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ret = func(*args, **kwargs)
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assert inspect.isawaitable(ret), f'{func!r} returned non-awaitable'
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fut = self._asyncioTestLoop.create_future()
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self._asyncioCallsQueue.put_nowait((fut, ret))
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return self._asyncioTestLoop.run_until_complete(fut)
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assert inspect.iscoroutinefunction(func), f'{func!r} is not an async function'
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task = self._asyncioTestLoop.create_task(
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func(*args, **kwargs),
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context=self._asyncioTestContext,
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)
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return self._asyncioTestLoop.run_until_complete(task)
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def _callMaybeAsync(self, func, /, *args, **kwargs):
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assert self._asyncioTestLoop is not None, 'asyncio test loop is not initialized'
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ret = func(*args, **kwargs)
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if inspect.isawaitable(ret):
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fut = self._asyncioTestLoop.create_future()
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self._asyncioCallsQueue.put_nowait((fut, ret))
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return self._asyncioTestLoop.run_until_complete(fut)
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if inspect.iscoroutinefunction(func):
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task = self._asyncioTestLoop.create_task(
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func(*args, **kwargs),
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context=self._asyncioTestContext,
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)
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return self._asyncioTestLoop.run_until_complete(task)
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else:
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return ret
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async def _asyncioLoopRunner(self, fut):
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self._asyncioCallsQueue = queue = asyncio.Queue()
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fut.set_result(None)
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while True:
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query = await queue.get()
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queue.task_done()
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if query is None:
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return
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fut, awaitable = query
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try:
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ret = await awaitable
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if not fut.cancelled():
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fut.set_result(ret)
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except (SystemExit, KeyboardInterrupt):
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raise
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except (BaseException, asyncio.CancelledError) as ex:
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if not fut.cancelled():
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fut.set_exception(ex)
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return self._asyncioTestContext.run(func, *args, **kwargs)
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def _setupAsyncioLoop(self):
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assert self._asyncioTestLoop is None, 'asyncio test loop already initialized'
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@ -116,16 +100,11 @@ class IsolatedAsyncioTestCase(TestCase):
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asyncio.set_event_loop(loop)
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loop.set_debug(True)
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self._asyncioTestLoop = loop
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fut = loop.create_future()
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self._asyncioCallsTask = loop.create_task(self._asyncioLoopRunner(fut))
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loop.run_until_complete(fut)
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def _tearDownAsyncioLoop(self):
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assert self._asyncioTestLoop is not None, 'asyncio test loop is not initialized'
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loop = self._asyncioTestLoop
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self._asyncioTestLoop = None
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self._asyncioCallsQueue.put_nowait(None)
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loop.run_until_complete(self._asyncioCallsQueue.join())
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try:
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# cancel all tasks
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@ -1,4 +1,5 @@
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import asyncio
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import contextvars
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import unittest
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from test import support
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@ -11,6 +12,9 @@ def tearDownModule():
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asyncio.set_event_loop_policy(None)
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VAR = contextvars.ContextVar('VAR', default=())
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class TestAsyncCase(unittest.TestCase):
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maxDiff = None
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@ -24,22 +28,26 @@ class TestAsyncCase(unittest.TestCase):
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def setUp(self):
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self.assertEqual(events, [])
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events.append('setUp')
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VAR.set(VAR.get() + ('setUp',))
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async def asyncSetUp(self):
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self.assertEqual(events, ['setUp'])
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events.append('asyncSetUp')
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VAR.set(VAR.get() + ('asyncSetUp',))
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self.addAsyncCleanup(self.on_cleanup1)
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async def test_func(self):
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self.assertEqual(events, ['setUp',
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'asyncSetUp'])
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events.append('test')
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VAR.set(VAR.get() + ('test',))
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self.addAsyncCleanup(self.on_cleanup2)
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async def asyncTearDown(self):
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self.assertEqual(events, ['setUp',
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'asyncSetUp',
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'test'])
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VAR.set(VAR.get() + ('asyncTearDown',))
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events.append('asyncTearDown')
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def tearDown(self):
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@ -48,6 +56,7 @@ class TestAsyncCase(unittest.TestCase):
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'test',
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'asyncTearDown'])
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events.append('tearDown')
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VAR.set(VAR.get() + ('tearDown',))
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async def on_cleanup1(self):
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self.assertEqual(events, ['setUp',
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@ -57,6 +66,9 @@ class TestAsyncCase(unittest.TestCase):
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'tearDown',
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'cleanup2'])
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events.append('cleanup1')
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VAR.set(VAR.get() + ('cleanup1',))
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nonlocal cvar
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cvar = VAR.get()
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async def on_cleanup2(self):
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self.assertEqual(events, ['setUp',
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@ -65,8 +77,10 @@ class TestAsyncCase(unittest.TestCase):
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'asyncTearDown',
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'tearDown'])
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events.append('cleanup2')
|
||||
VAR.set(VAR.get() + ('cleanup2',))
|
||||
|
||||
events = []
|
||||
cvar = ()
|
||||
test = Test("test_func")
|
||||
result = test.run()
|
||||
self.assertEqual(result.errors, [])
|
||||
|
@ -74,13 +88,17 @@ class TestAsyncCase(unittest.TestCase):
|
|||
expected = ['setUp', 'asyncSetUp', 'test',
|
||||
'asyncTearDown', 'tearDown', 'cleanup2', 'cleanup1']
|
||||
self.assertEqual(events, expected)
|
||||
self.assertEqual(cvar, tuple(expected))
|
||||
|
||||
events = []
|
||||
cvar = ()
|
||||
test = Test("test_func")
|
||||
test.debug()
|
||||
self.assertEqual(events, expected)
|
||||
self.assertEqual(cvar, tuple(expected))
|
||||
test.doCleanups()
|
||||
self.assertEqual(events, expected)
|
||||
self.assertEqual(cvar, tuple(expected))
|
||||
|
||||
def test_exception_in_setup(self):
|
||||
class Test(unittest.IsolatedAsyncioTestCase):
|
||||
|
|
|
@ -0,0 +1,2 @@
|
|||
Accept explicit contextvars.Context in :func:`asyncio.create_task` and
|
||||
:meth:`asyncio.loop.create_task`.
|
|
@ -2003,14 +2003,16 @@ _asyncio.Task.__init__
|
|||
*
|
||||
loop: object = None
|
||||
name: object = None
|
||||
context: object = None
|
||||
|
||||
A coroutine wrapped in a Future.
|
||||
[clinic start generated code]*/
|
||||
|
||||
static int
|
||||
_asyncio_Task___init___impl(TaskObj *self, PyObject *coro, PyObject *loop,
|
||||
PyObject *name)
|
||||
/*[clinic end generated code: output=88b12b83d570df50 input=352a3137fe60091d]*/
|
||||
PyObject *name, PyObject *context)
|
||||
/*[clinic end generated code: output=49ac96fe33d0e5c7 input=924522490c8ce825]*/
|
||||
|
||||
{
|
||||
if (future_init((FutureObj*)self, loop)) {
|
||||
return -1;
|
||||
|
@ -2028,9 +2030,13 @@ _asyncio_Task___init___impl(TaskObj *self, PyObject *coro, PyObject *loop,
|
|||
return -1;
|
||||
}
|
||||
|
||||
Py_XSETREF(self->task_context, PyContext_CopyCurrent());
|
||||
if (self->task_context == NULL) {
|
||||
return -1;
|
||||
if (context == Py_None) {
|
||||
Py_XSETREF(self->task_context, PyContext_CopyCurrent());
|
||||
if (self->task_context == NULL) {
|
||||
return -1;
|
||||
}
|
||||
} else {
|
||||
self->task_context = Py_NewRef(context);
|
||||
}
|
||||
|
||||
Py_CLEAR(self->task_fut_waiter);
|
||||
|
|
|
@ -310,28 +310,29 @@ _asyncio_Future__repr_info(FutureObj *self, PyObject *Py_UNUSED(ignored))
|
|||
}
|
||||
|
||||
PyDoc_STRVAR(_asyncio_Task___init____doc__,
|
||||
"Task(coro, *, loop=None, name=None)\n"
|
||||
"Task(coro, *, loop=None, name=None, context=None)\n"
|
||||
"--\n"
|
||||
"\n"
|
||||
"A coroutine wrapped in a Future.");
|
||||
|
||||
static int
|
||||
_asyncio_Task___init___impl(TaskObj *self, PyObject *coro, PyObject *loop,
|
||||
PyObject *name);
|
||||
PyObject *name, PyObject *context);
|
||||
|
||||
static int
|
||||
_asyncio_Task___init__(PyObject *self, PyObject *args, PyObject *kwargs)
|
||||
{
|
||||
int return_value = -1;
|
||||
static const char * const _keywords[] = {"coro", "loop", "name", NULL};
|
||||
static const char * const _keywords[] = {"coro", "loop", "name", "context", NULL};
|
||||
static _PyArg_Parser _parser = {NULL, _keywords, "Task", 0};
|
||||
PyObject *argsbuf[3];
|
||||
PyObject *argsbuf[4];
|
||||
PyObject * const *fastargs;
|
||||
Py_ssize_t nargs = PyTuple_GET_SIZE(args);
|
||||
Py_ssize_t noptargs = nargs + (kwargs ? PyDict_GET_SIZE(kwargs) : 0) - 1;
|
||||
PyObject *coro;
|
||||
PyObject *loop = Py_None;
|
||||
PyObject *name = Py_None;
|
||||
PyObject *context = Py_None;
|
||||
|
||||
fastargs = _PyArg_UnpackKeywords(_PyTuple_CAST(args)->ob_item, nargs, kwargs, NULL, &_parser, 1, 1, 0, argsbuf);
|
||||
if (!fastargs) {
|
||||
|
@ -347,9 +348,15 @@ _asyncio_Task___init__(PyObject *self, PyObject *args, PyObject *kwargs)
|
|||
goto skip_optional_kwonly;
|
||||
}
|
||||
}
|
||||
name = fastargs[2];
|
||||
if (fastargs[2]) {
|
||||
name = fastargs[2];
|
||||
if (!--noptargs) {
|
||||
goto skip_optional_kwonly;
|
||||
}
|
||||
}
|
||||
context = fastargs[3];
|
||||
skip_optional_kwonly:
|
||||
return_value = _asyncio_Task___init___impl((TaskObj *)self, coro, loop, name);
|
||||
return_value = _asyncio_Task___init___impl((TaskObj *)self, coro, loop, name, context);
|
||||
|
||||
exit:
|
||||
return return_value;
|
||||
|
@ -917,4 +924,4 @@ _asyncio__leave_task(PyObject *module, PyObject *const *args, Py_ssize_t nargs,
|
|||
exit:
|
||||
return return_value;
|
||||
}
|
||||
/*[clinic end generated code: output=344927e9b6016ad7 input=a9049054013a1b77]*/
|
||||
/*[clinic end generated code: output=540ed3caf5a4d57d input=a9049054013a1b77]*/
|
||||
|
|
Loading…
Reference in New Issue