47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
import structio
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from typing import Any
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async def reader(ch: structio.ChannelReader):
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print("[reader] Reader is alive!")
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async with ch:
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while True:
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print(f"[reader] Awaiting messages")
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data = await ch.receive()
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if not data:
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break
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print(f"[reader] Got: {data}")
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# Simulates some work
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await structio.sleep(1)
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print("[reader] Done!")
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async def writer(ch: structio.ChannelWriter, objects: list[Any]):
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print("[writer] Writer is alive!")
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async with ch:
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for obj in objects:
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print(f"[writer] Sending {obj!r}")
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await ch.send(obj)
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print(f"[writer] Sent {obj!r}")
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# Let's make the writer twice as fast as the receiver
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# to test backpressure :)
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await structio.sleep(0.5)
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await ch.send(None)
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print("[writer] Done!")
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async def main(objects: list[Any]):
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print("[main] Parent is alive")
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# We construct a new memory channel...
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channel = structio.MemoryChannel(1) # 1 is the size of the internal buffer
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async with structio.create_pool() as pool:
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# ... and dispatch the two ends to different
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# tasks. Isn't this neat?
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pool.spawn(reader, channel.reader)
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pool.spawn(writer, channel.writer, objects)
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print("[main] Children spawned")
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print("[main] Done!")
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structio.run(main, [1, 2, 3, 4])
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