forked from goodboy/tractor
170 lines
4.4 KiB
Python
170 lines
4.4 KiB
Python
"""
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Infection apis for ``asyncio`` loops running ``trio`` using guest mode.
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"""
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import asyncio
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import inspect
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from typing import (
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Any,
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Callable,
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AsyncGenerator,
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Awaitable,
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Union,
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)
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import trio
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from .log import get_logger
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from ._state import current_actor
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log = get_logger(__name__)
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__all__ = ['run_task', 'run_as_asyncio_guest']
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async def run_coro(
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to_trio: trio.MemorySendChannel,
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coro: Awaitable,
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) -> None:
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"""Await ``coro`` and relay result back to ``trio``.
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"""
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to_trio.send_nowait(await coro)
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async def consume_asyncgen(
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to_trio: trio.MemorySendChannel,
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coro: AsyncGenerator,
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) -> None:
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"""Stream async generator results back to ``trio``.
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``from_trio`` might eventually be used here for
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bidirectional streaming.
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"""
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async for item in coro:
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to_trio.send_nowait(item)
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async def run_task(
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func: Callable,
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*,
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qsize: int = 2**10,
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_treat_as_stream: bool = False,
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**kwargs,
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) -> Union[AsyncGenerator, Any]:
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"""Run an ``asyncio`` async function or generator in a task, return
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or stream the result back to ``trio``.
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"""
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assert current_actor().is_infected_aio()
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# ITC (inter task comms)
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from_trio = asyncio.Queue(qsize) # type: ignore
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to_trio, from_aio = trio.open_memory_channel(qsize) # type: ignore
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args = tuple(inspect.getfullargspec(func).args)
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if getattr(func, '_tractor_steam_function', None):
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# the assumption is that the target async routine accepts the
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# send channel then it intends to yield more then one return
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# value otherwise it would just return ;P
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_treat_as_stream = True
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# allow target func to accept/stream results manually by name
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if 'to_trio' in args:
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kwargs['to_trio'] = to_trio
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if 'from_trio' in args:
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kwargs['from_trio'] = from_trio
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coro = func(**kwargs)
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cancel_scope = trio.CancelScope()
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# start the asyncio task we submitted from trio
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# TODO: try out ``anyio`` asyncio based tg here
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if inspect.isawaitable(coro):
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task = asyncio.create_task(run_coro(to_trio, coro))
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elif inspect.isasyncgen(coro):
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task = asyncio.create_task(consume_asyncgen(to_trio, coro))
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else:
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raise TypeError(f"No support for {coro}")
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err = None
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def cancel_trio(task):
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"""Cancel the calling ``trio`` task on error.
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"""
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nonlocal err
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err = task.exception()
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cancel_scope.cancel()
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task.add_done_callback(cancel_trio)
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# asycn gen
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if inspect.isasyncgen(coro) or _treat_as_stream:
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async def stream_results():
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with cancel_scope:
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# stream values upward
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async with from_aio:
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async for item in from_aio:
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yield item
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if cancel_scope.cancelled_caught and err:
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raise err
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return stream_results()
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# simple async func
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elif inspect.iscoroutine(coro):
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with cancel_scope:
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# return single value
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return await from_aio.receive()
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if cancel_scope.cancelled_caught and err:
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raise err
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def run_as_asyncio_guest(
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trio_main: Callable,
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) -> None:
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"""Entry for an "infected ``asyncio`` actor".
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Uh, oh. :o
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It looks like your event loop has caught a case of the ``trio``s.
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:()
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Don't worry, we've heard you'll barely notice. You might hallucinate
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a few more propagating errors and feel like your digestion has
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slowed but if anything get's too bad your parents will know about
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it.
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:)
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"""
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async def aio_main(trio_main):
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loop = asyncio.get_running_loop()
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trio_done_fut = asyncio.Future()
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def trio_done_callback(main_outcome):
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log.info(f"trio_main finished: {main_outcome!r}")
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trio_done_fut.set_result(main_outcome)
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# start the infection: run trio on the asyncio loop in "guest mode"
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log.info(f"Infecting asyncio process with {trio_main}")
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trio.lowlevel.start_guest_run(
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trio_main,
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run_sync_soon_threadsafe=loop.call_soon_threadsafe,
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done_callback=trio_done_callback,
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)
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(await trio_done_fut).unwrap()
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# might as well if it's installed.
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try:
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import uvloop
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loop = uvloop.new_event_loop()
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asyncio.set_event_loop(loop)
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except ImportError:
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pass
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asyncio.run(aio_main(trio_main))
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