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tractor/tests/test_pubsub.py

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Python

from functools import partial
from itertools import cycle
import pytest
import trio
import tractor
from async_generator import aclosing
from tractor.testing import tractor_test
def is_even(i):
return i % 2 == 0
@tractor.msg.pub
async def pubber(get_topics):
for i in cycle(range(10)):
topics = get_topics()
yield {'even' if is_even(i) else 'odd': i}
await trio.sleep(0.1)
async def subs(which):
if len(which) == 1:
if which[0] == 'even':
pred = is_even
else:
pred = lambda i: not is_even(i)
else:
pred = lambda i: isinstance(i, int)
async with tractor.find_actor('streamer') as portal:
agen = await portal.run(__name__, 'pubber', topics=which)
async with aclosing(agen) as agen:
async for pkt in agen:
for topic, value in pkt.items():
assert pred(value)
def test_pubsub_multi_actor_subs(
loglevel,
arb_addr,
):
async def main():
async with tractor.open_nursery() as n:
# start the publisher as a daemon
master_portal = await n.start_actor(
'streamer',
rpc_module_paths=[__name__],
)
even_portal = await n.run_in_actor('evens', subs, which=['even'])
odd_portal = await n.run_in_actor('odds', subs, which=['odd'])
async with tractor.wait_for_actor('odds'):
# block until 2nd actor is initialized
pass
# TODO: how to make this work when the arbiter gets
# a portal to itself? Currently this causes a hang
# when the channel server is torn down due to a lingering
# loopback channel
# with trio.move_on_after(1):
# await subs(['even', 'odd'])
# XXX: this would cause infinite
# blocking due to actor never terminating loop
# await even_portal.result()
await trio.sleep(1)
await even_portal.cancel_actor()
await trio.sleep(1)
await odd_portal.cancel_actor()
await master_portal.cancel_actor()
tractor.run(
main,
arbiter_addr=arb_addr,
rpc_module_paths=[__name__],
)