babichjacob-bounded-channel 0.3.3

A Python implementation of tokio::sync::mpsc::channel

🪢 Bounded Channel

This library uses documentation copied and pasted from Tokio's sync::mpsc library, which they have generously published under the MIT license. 🙏

This is a Python implementation of their bounded channel.

💻 Installation

This package is published to PyPI as babichjacob-bounded-channel.

🛠 Usage

from asyncio import create_task, gather, run, sleep
from itertools import count

from bounded_channel import bounded_channel, Receiver, Sender


async def producer(sender: Sender[int]):
    "Produces integer values as long as there is a receiver to receive them"
    for value in count():
        await sleep(0.02)

        res = await sender.send(value)

        # No receivers are listening anymore
        if res.is_err():
            break


async def consumer(receiver: Receiver[int]):
    async for value in receiver:
        await sleep(0.03)

        print("received", value)

        if value >= 100:
            # Signal to please stop producing values
            receiver.close()
            # From then on, the remaining buffered values will be received
            # until they run out for good (to a maximum of 165 or so)
            # (it's dependent on the difference of speed between the producer and consumer)

    # Alternatively, the loop could be broken out of
    # and any extra buffered values would be ignored


async def main():
    sender, receiver = channel(64)

    producer_task = create_task(producer(sender))
    consumer_task = create_task(consumer(receiver))

    # Drop extra references to the sender and receiver
    del sender
    del receiver
    # so their RAII semantics behave properly

    await gather(producer_task, consumer_task)


run(main())

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📄 License

MIT

🙏 Attribution

This README was generated with ❤️ by readme-md-generator