forked from goodboy/tractor
107 lines
3.0 KiB
Python
107 lines
3.0 KiB
Python
'''
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Async context manager cache api testing: ``trionics.maybe_open_context():``
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'''
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from contextlib import asynccontextmanager as acm
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from typing import Awaitable
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import trio
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import tractor
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@tractor.context
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async def streamer(
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ctx: tractor.Context,
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seq: list[int] = list(range(1000)),
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) -> None:
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await ctx.started()
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async with ctx.open_stream() as stream:
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for val in seq:
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await stream.send(val)
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await trio.sleep(0.001)
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print('producer finished')
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@acm
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async def open_stream() -> Awaitable[tractor.MsgStream]:
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async with tractor.open_nursery() as tn:
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portal = await tn.start_actor('streamer', enable_modules=[__name__])
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async with (
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portal.open_context(streamer) as (ctx, first),
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ctx.open_stream() as stream,
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):
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yield stream
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await portal.cancel_actor()
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print('CANCELLED STREAMER')
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@acm
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async def maybe_open_stream(taskname: str):
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async with tractor.trionics.maybe_open_context(
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# NOTE: all secondary tasks should cache hit on the same key
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acm_func=open_stream,
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) as (cache_hit, stream):
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if cache_hit:
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print(f'{taskname} loaded from cache')
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# add a new broadcast subscription for the quote stream
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# if this feed is already allocated by the first
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# task that entereed
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async with stream.subscribe() as bstream:
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yield bstream
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else:
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# yield the actual stream
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yield stream
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def test_open_local_sub_to_stream():
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'''
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Verify a single inter-actor stream can can be fanned-out shared to
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N local tasks using ``trionics.maybe_open_context():``.
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'''
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async def main():
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full = list(range(1000))
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async def get_sub_and_pull(taskname: str):
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async with (
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maybe_open_stream(taskname) as stream,
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):
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if '0' in taskname:
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assert isinstance(stream, tractor.MsgStream)
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else:
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assert isinstance(
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stream,
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tractor.trionics.BroadcastReceiver
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)
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first = await stream.receive()
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print(f'{taskname} started with value {first}')
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seq = []
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async for msg in stream:
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seq.append(msg)
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assert set(seq).issubset(set(full))
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print(f'{taskname} finished')
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# TODO: turns out this isn't multi-task entrant XD
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# We probably need an indepotent entry semantic?
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with trio.fail_after(3):
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async with tractor.open_root_actor():
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async with (
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trio.open_nursery() as nurse,
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):
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for i in range(10):
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nurse.start_soon(get_sub_and_pull, f'task_{i}')
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await trio.sleep(0.001)
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print('all consumer tasks finished')
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trio.run(main)
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