tractor/examples/full_fledged_streaming_serv...

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import time
import trio
import tractor
# this is the first 2 actors, streamer_1 and streamer_2
async def stream_data(seed):
for i in range(seed):
yield i
await trio.sleep(0.0001) # trigger scheduler
# this is the third actor; the aggregator
async def aggregate(seed):
'''
Ensure that the two streams we receive match but only stream
a single set of values to the parent.
'''
async with tractor.open_nursery() as nursery:
portals = []
for i in range(1, 3):
# fork point
portal = await nursery.start_actor(
name=f'streamer_{i}',
enable_modules=[__name__],
)
portals.append(portal)
send_chan, recv_chan = trio.open_memory_channel(500)
async def push_to_chan(portal, send_chan):
# TODO: https://github.com/goodboy/tractor/issues/207
async with send_chan:
async with portal.open_stream_from(stream_data, seed=seed) as stream:
async for value in stream:
# leverage trio's built-in backpressure
await send_chan.send(value)
print(f"FINISHED ITERATING {portal.channel.uid}")
# spawn 2 trio tasks to collect streams and push to a local queue
async with trio.open_nursery() as n:
for portal in portals:
n.start_soon(push_to_chan, portal, send_chan.clone())
# close this local task's reference to send side
await send_chan.aclose()
unique_vals = set()
async with recv_chan:
async for value in recv_chan:
if value not in unique_vals:
unique_vals.add(value)
# yield upwards to the spawning parent actor
yield value
assert value in unique_vals
print("FINISHED ITERATING in aggregator")
await nursery.cancel()
print("WAITING on `ActorNursery` to finish")
print("AGGREGATOR COMPLETE!")
# this is the main actor and *arbiter*
async def main():
# a nursery which spawns "actors"
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async with tractor.open_nursery(
arbiter_addr=('127.0.0.1', 1616),
loglevel='cancel',
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) as nursery:
seed = int(1e3)
pre_start = time.time()
portal = await nursery.start_actor(
name='aggregator',
enable_modules=[__name__],
)
async with portal.open_stream_from(
aggregate,
seed=seed,
) as stream:
start = time.time()
# the portal call returns exactly what you'd expect
# as if the remote "aggregate" function was called locally
result_stream = []
async for value in stream:
result_stream.append(value)
print("ROOT STREAM CONSUMER COMPLETE")
print("ROOT CANCELLING AGGREGATOR CHILD")
await portal.cancel_actor()
print(f"STREAM TIME = {time.time() - start}")
print(f"STREAM + SPAWN TIME = {time.time() - pre_start}")
assert result_stream == list(range(seed))
return result_stream
if __name__ == '__main__':
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final_stream = trio.run(main)