tractor/examples/asynchronous_generators.py

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from itertools import repeat
import trio
import tractor
tractor.log.get_console_log("INFO")
async def stream_forever():
for i in repeat("I can see these little future bubble things"):
# each yielded value is sent over the ``Channel`` to the
# parent actor
yield i
await trio.sleep(0.01)
async def main():
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# stream for at most 1 seconds
with trio.move_on_after(1) as cancel_scope:
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async with tractor.open_nursery() as n:
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portal = await n.start_actor(
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'donny',
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enable_modules=[__name__],
)
# this async for loop streams values from the above
# async generator running in a separate process
async with portal.open_stream_from(stream_forever) as stream:
async for letter in stream:
print(letter)
# we support trio's cancellation system
assert cancel_scope.cancelled_caught
assert n.cancelled
if __name__ == '__main__':
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trio.run(main)