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Update streaming example in docs

close_mem_chans
Tyler Goodlet 2019-03-10 22:13:21 -04:00
parent 9a780485dc
commit 0b520c7bee
1 changed files with 19 additions and 17 deletions
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16
README.rst
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@ -391,31 +391,33 @@ and print the results to your screen:
send_chan, recv_chan = trio.open_memory_channel(500) send_chan, recv_chan = trio.open_memory_channel(500)
async def push_to_q(portal): async def push_to_chan(portal, send_chan):
async with send_chan:
async for value in await portal.run( async for value in await portal.run(
__name__, 'stream_data', seed=seed __name__, 'stream_data', seed=seed
): ):
# leverage trio's built-in backpressure # leverage trio's built-in backpressure
await send_chan.send(value) await send_chan.send(value)
await send_chan.send(None)
print(f"FINISHED ITERATING {portal.channel.uid}") print(f"FINISHED ITERATING {portal.channel.uid}")
# spawn 2 trio tasks to collect streams and push to a local queue # spawn 2 trio tasks to collect streams and push to a local queue
async with trio.open_nursery() as n: async with trio.open_nursery() as n:
for portal in portals: for portal in portals:
n.start_soon(push_to_q, portal) 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() unique_vals = set()
async with recv_chan:
async for value in recv_chan: async for value in recv_chan:
if value not in unique_vals: if value not in unique_vals:
unique_vals.add(value) unique_vals.add(value)
# yield upwards to the spawning parent actor # yield upwards to the spawning parent actor
yield value yield value
if value is None:
break
assert value in unique_vals assert value in unique_vals
print("FINISHED ITERATING in aggregator") print("FINISHED ITERATING in aggregator")
@ -449,7 +451,7 @@ and print the results to your screen:
print(f"STREAM TIME = {time.time() - start}") print(f"STREAM TIME = {time.time() - start}")
print(f"STREAM + SPAWN TIME = {time.time() - pre_start}") print(f"STREAM + SPAWN TIME = {time.time() - pre_start}")
assert result_stream == list(range(seed)) + [None] assert result_stream == list(range(seed))
return result_stream return result_stream