tractor/examples/debugging/asyncio_bp.py

125 lines
2.8 KiB
Python

import asyncio
import trio
import tractor
from tractor import (
to_asyncio,
Portal,
)
async def aio_sleep_forever():
await asyncio.sleep(float('inf'))
async def bp_then_error(
to_trio: trio.MemorySendChannel,
from_trio: asyncio.Queue,
raise_after_bp: bool = True,
) -> None:
# sync with ``trio``-side (caller) task
to_trio.send_nowait('start')
# NOTE: what happens here inside the hook needs some refinement..
# => seems like it's still `._debug._set_trace()` but
# we set `Lock.local_task_in_debug = 'sync'`, we probably want
# some further, at least, meta-data about the task/actoq in debug
# in terms of making it clear it's asyncio mucking about.
breakpoint()
# short checkpoint / delay
await asyncio.sleep(0.5)
if raise_after_bp:
raise ValueError('blah')
# TODO: test case with this so that it gets cancelled?
else:
# XXX NOTE: this is required in order to get the SIGINT-ignored
# hang case documented in the module script section!
await aio_sleep_forever()
@tractor.context
async def trio_ctx(
ctx: tractor.Context,
bp_before_started: bool = True,
):
# this will block until the ``asyncio`` task sends a "first"
# message, see first line in above func.
async with (
to_asyncio.open_channel_from(
bp_then_error,
raise_after_bp=not bp_before_started,
) as (first, chan),
trio.open_nursery() as n,
):
assert first == 'start'
if bp_before_started:
await tractor.breakpoint()
await ctx.started(first)
n.start_soon(
to_asyncio.run_task,
aio_sleep_forever,
)
await trio.sleep_forever()
async def main(
bps_all_over: bool = True,
) -> None:
async with tractor.open_nursery(
debug_mode=True,
maybe_enable_greenback=True,
# loglevel='devx',
# loglevel='runtime',
) as n:
ptl: Portal = await n.start_actor(
'aio_daemon',
enable_modules=[__name__],
infect_asyncio=True,
debug_mode=True,
loglevel='cancel',
)
async with ptl.open_context(
trio_ctx,
bp_before_started=bps_all_over,
) as (ctx, first):
assert first == 'start'
if bps_all_over:
await tractor.breakpoint()
# await trio.sleep_forever()
await ctx.cancel()
assert 0
# TODO: case where we cancel from trio-side while asyncio task
# has debugger lock?
# await ptl.cancel_actor()
if __name__ == '__main__':
# works fine B)
trio.run(main)
# will hang and ignores SIGINT !!
# NOTE: you'll need to send a SIGQUIT (via ctl-\) to kill it
# manually..
# trio.run(main, True)