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