Staging
v0.8.1
v0.8.1
https://github.com/python/cpython
Tip revision: 6c38841c08edd6b0727903ec3f1acd10dc9766f6 authored by Ćukasz Langa on 29 June 2020, 22:30:11 UTC
Python 3.8.4rc1
Python 3.8.4rc1
Tip revision: 6c38841
runners.py
__all__ = 'run',
from . import coroutines
from . import events
from . import tasks
def run(main, *, debug=False):
"""Execute the coroutine and return the result.
This function runs the passed coroutine, taking care of
managing the asyncio event loop and finalizing asynchronous
generators.
This function cannot be called when another asyncio event loop is
running in the same thread.
If debug is True, the event loop will be run in debug mode.
This function always creates a new event loop and closes it at the end.
It should be used as a main entry point for asyncio programs, and should
ideally only be called once.
Example:
async def main():
await asyncio.sleep(1)
print('hello')
asyncio.run(main())
"""
if events._get_running_loop() is not None:
raise RuntimeError(
"asyncio.run() cannot be called from a running event loop")
if not coroutines.iscoroutine(main):
raise ValueError("a coroutine was expected, got {!r}".format(main))
loop = events.new_event_loop()
try:
events.set_event_loop(loop)
loop.set_debug(debug)
return loop.run_until_complete(main)
finally:
try:
_cancel_all_tasks(loop)
loop.run_until_complete(loop.shutdown_asyncgens())
finally:
events.set_event_loop(None)
loop.close()
def _cancel_all_tasks(loop):
to_cancel = tasks.all_tasks(loop)
if not to_cancel:
return
for task in to_cancel:
task.cancel()
loop.run_until_complete(
tasks.gather(*to_cancel, loop=loop, return_exceptions=True))
for task in to_cancel:
if task.cancelled():
continue
if task.exception() is not None:
loop.call_exception_handler({
'message': 'unhandled exception during asyncio.run() shutdown',
'exception': task.exception(),
'task': task,
})