tractor/examples/debugging/multi_subactor_root_errors.py

'''
Test that a nested nursery will avoid clobbering
the debugger latched by a broken child.

'''
import trio
import tractor


async def name_error():
    "Raise a ``NameError``"
    getattr(doggypants)  # noqa


async def spawn_error():
    """"A nested nursery that triggers another ``NameError``.
    """
    async with tractor.open_nursery() as n:
        portal = await n.run_in_actor(
            name_error,
            name='name_error_1',
            )
        return await portal.result()


async def main():
    """The main ``tractor`` routine.

    The process tree should look as approximately as follows:

    python examples/debugging/multi_subactors.py
    ├─ python -m tractor._child --uid ('name_error', 'a7caf490 ...)
    `-python -m tractor._child --uid ('spawn_error', '52ee14a5 ...)
       `-python -m tractor._child --uid ('name_error', '3391222c ...)

    Order of failure:
        - nested name_error sub-sub-actor
        - root actor should then fail on assert
        - program termination
    """
    async with tractor.open_nursery(
        debug_mode=True,
        # loglevel='cancel',
    ) as n:

        # spawn both actors
        portal = await n.run_in_actor(
            name_error,
            name='name_error',
        )
        portal1 = await n.run_in_actor(
            spawn_error,
            name='spawn_error',
        )

        # trigger a root actor error
        assert 0

        # attempt to collect results (which raises error in parent)
        # still has some issues where the parent seems to get stuck
        await portal.result()
        await portal1.result()


if __name__ == '__main__':
    trio.run(main)