from collections.abc import AsyncIterator

import tractor
import trio


async def breakpoint_forever() -> AsyncIterator[str]:
    '''
    Indefinitely re-enter debugger in child actor.

    '''
    try:
        while True:
            yield 'yo'
            await tractor.pause()
    except BaseException:
        tractor.log.get_console_log().exception(
            'Cancelled while trying to enter pause point!'
        )
        raise


async def name_error() -> None:
    '''
    Raise a ``NameError``.

    '''
    getattr(doggypants)  # noqa


async def main() -> None:
    '''
    Test breakpoint in a streaming actor.

    '''
    async with tractor.open_nursery(
        debug_mode=True,
    ) as an:
        p0: tractor.Portal = await an.start_actor(
            'bp_forever',
            enable_modules=[__name__],
        )
        p1: tractor.Portal = await an.start_actor(
            'name_error',
            enable_modules=[__name__],
        )

        # retreive results
        async with p0.open_stream_from(breakpoint_forever) as stream:

            # triggers the first name error
            try:
                await p1.run(name_error)
            except tractor.RemoteActorError as rae:
                assert rae.boxed_type is NameError

            i: str
            async for i in stream:

                # a second time try the failing subactor and this tie
                # let error propagate up to the parent/nursery.
                await p1.run(name_error)


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