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tractor/tests/test_spawning.py

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Python

"""
Spawning basics
"""
from typing import Optional
import pytest
import trio
import tractor
from conftest import tractor_test
data_to_pass_down = {'doggy': 10, 'kitty': 4}
async def spawn(
is_arbiter: bool,
data: dict,
reg_addr: tuple[str, int],
):
namespaces = [__name__]
await trio.sleep(0.1)
async with tractor.open_root_actor(
arbiter_addr=reg_addr,
):
actor = tractor.current_actor()
assert actor.is_arbiter == is_arbiter
data = data_to_pass_down
if actor.is_arbiter:
async with tractor.open_nursery(
) as nursery:
# forks here
portal = await nursery.run_in_actor(
spawn,
is_arbiter=False,
name='sub-actor',
data=data,
reg_addr=reg_addr,
enable_modules=namespaces,
)
assert len(nursery._children) == 1
assert portal.channel.uid in tractor.current_actor()._peers
# be sure we can still get the result
result = await portal.result()
assert result == 10
return result
else:
return 10
def test_local_arbiter_subactor_global_state(reg_addr):
result = trio.run(
spawn,
True,
data_to_pass_down,
reg_addr,
)
assert result == 10
async def movie_theatre_question():
"""A question asked in a dark theatre, in a tangent
(errr, I mean different) process.
"""
return 'have you ever seen a portal?'
@tractor_test
async def test_movie_theatre_convo(start_method):
"""The main ``tractor`` routine.
"""
async with tractor.open_nursery() as n:
portal = await n.start_actor(
'frank',
# enable the actor to run funcs from this current module
enable_modules=[__name__],
)
print(await portal.run(movie_theatre_question))
# call the subactor a 2nd time
print(await portal.run(movie_theatre_question))
# the async with will block here indefinitely waiting
# for our actor "frank" to complete, we cancel 'frank'
# to avoid blocking indefinitely
await portal.cancel_actor()
async def cellar_door(return_value: Optional[str]):
return return_value
@pytest.mark.parametrize(
'return_value', ["Dang that's beautiful", None],
ids=['return_str', 'return_None'],
)
@tractor_test
async def test_most_beautiful_word(
start_method,
return_value
):
'''
The main ``tractor`` routine.
'''
with trio.fail_after(1):
async with tractor.open_nursery() as n:
portal = await n.run_in_actor(
cellar_door,
return_value=return_value,
name='some_linguist',
)
print(await portal.result())
# The ``async with`` will unblock here since the 'some_linguist'
# actor has completed its main task ``cellar_door``.
# this should pull the cached final result already captured during
# the nursery block exit.
print(await portal.result())
async def check_loglevel(level):
assert tractor.current_actor().loglevel == level
log = tractor.log.get_logger()
# XXX using a level actually used inside tractor seems to trigger
# some kind of `logging` module bug FYI.
log.critical('yoyoyo')
def test_loglevel_propagated_to_subactor(
start_method,
capfd,
reg_addr,
):
if start_method == 'mp_forkserver':
pytest.skip(
"a bug with `capfd` seems to make forkserver capture not work?")
level = 'critical'
async def main():
async with tractor.open_nursery(
name='arbiter',
start_method=start_method,
arbiter_addr=reg_addr,
) as tn:
await tn.run_in_actor(
check_loglevel,
loglevel=level,
level=level,
)
trio.run(main)
# ensure subactor spits log message on stderr
captured = capfd.readouterr()
assert 'yoyoyo' in captured.err