129 lines
3.6 KiB
Python
129 lines
3.6 KiB
Python
import time
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import trio
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import tractor
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from tractor import (
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ActorNursery,
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MsgStream,
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Portal,
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)
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# this is the first 2 actors, streamer_1 and streamer_2
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async def stream_data(seed):
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for i in range(seed):
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yield i
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await trio.sleep(0.0001) # trigger scheduler
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# this is the third actor; the aggregator
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async def aggregate(seed):
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'''
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Ensure that the two streams we receive match but only stream
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a single set of values to the parent.
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'''
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an: ActorNursery
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async with tractor.open_nursery() as an:
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portals: list[Portal] = []
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for i in range(1, 3):
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# fork/spawn call
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portal = await an.start_actor(
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name=f'streamer_{i}',
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enable_modules=[__name__],
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)
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portals.append(portal)
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send_chan, recv_chan = trio.open_memory_channel(500)
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async def push_to_chan(portal, send_chan):
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# TODO: https://github.com/goodboy/tractor/issues/207
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async with send_chan:
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async with portal.open_stream_from(stream_data, seed=seed) as stream:
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async for value in stream:
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# leverage trio's built-in backpressure
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await send_chan.send(value)
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print(f"FINISHED ITERATING {portal.channel.uid}")
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# spawn 2 trio tasks to collect streams and push to a local queue
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async with trio.open_nursery() as n:
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for portal in portals:
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n.start_soon(
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push_to_chan,
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portal,
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send_chan.clone(),
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)
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# close this local task's reference to send side
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await send_chan.aclose()
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unique_vals = set()
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async with recv_chan:
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async for value in recv_chan:
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if value not in unique_vals:
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unique_vals.add(value)
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# yield upwards to the spawning parent actor
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yield value
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assert value in unique_vals
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print("FINISHED ITERATING in aggregator")
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await an.cancel()
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print("WAITING on `ActorNursery` to finish")
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print("AGGREGATOR COMPLETE!")
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async def main() -> list[int]:
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'''
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This is the "root" actor's main task's entrypoint.
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By default (and if not otherwise specified) that root process
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also acts as a "registry actor" / "registrar" on the localhost
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for the purposes of multi-actor "service discovery".
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'''
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# yes, a nursery which spawns `trio`-"actors" B)
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an: ActorNursery
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async with tractor.open_nursery(
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loglevel='cancel',
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debug_mode=True,
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) as an:
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seed = int(1e3)
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pre_start = time.time()
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portal: Portal = await an.start_actor(
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name='aggregator',
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enable_modules=[__name__],
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)
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stream: MsgStream
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async with portal.open_stream_from(
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aggregate,
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seed=seed,
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) as stream:
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start = time.time()
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# the portal call returns exactly what you'd expect
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# as if the remote "aggregate" function was called locally
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result_stream: list[int] = []
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async for value in stream:
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result_stream.append(value)
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cancelled: bool = await portal.cancel_actor()
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assert cancelled
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print(f"STREAM TIME = {time.time() - start}")
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print(f"STREAM + SPAWN TIME = {time.time() - pre_start}")
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assert result_stream == list(range(seed))
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return result_stream
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if __name__ == '__main__':
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final_stream = trio.run(main)
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