uringloop

A Python implementation of a liburing-based proactor event loop for asyncio, designed to follow Python standard library conventions. The implementation is written primarily in pure Python, using CFFI only for wrapping the liburing interface.

• Implements a Proactor pattern similar to Windows' IOCP (reference implementation)
• Follows Python's standard asyncio implementation patterns

⚠️ Note: This is currently experimental and not yet stable

Goals

• Provide a primarily Python (with CFFI, maybe C extention in future) implementation of a liburing-based event loop
• Maintain full compatibility with standard asyncio APIs
• Follow Python standard library implementation patterns

Requirements

• Linux 5.19+ kernel

• Python 3.12+

• liburing development libraries

  sudo apt install liburing-dev

Installation

• Using uv:

uv add uringloop

• Using pip:

pip install uringloop

Quick Start

Set the event loop policy with asyncio.set_event_loop_policy(IouringProactorEventLoopPolicy()) to use the io_uring-based event loop.

import asyncio

from uringloop import IouringProactorEventLoopPolicy


asyncio.set_event_loop_policy(IouringProactorEventLoopPolicy())


async def handle_client(reader: asyncio.StreamReader, writer: asyncio.StreamWriter):
    addr = writer.get_extra_info('peername')
    print(f"Connection from {addr}")

    while True:
        data = await reader.read(1024)
        if not data:
            break
        print(f"Received: {data.decode()}")
        writer.write(data)
        await writer.drain()

    print(f"Connection with {addr} closed")
    writer.close()


async def start_server():
    server = await asyncio.start_server(
        handle_client, '127.0.0.1', 8888)
    addr = server.sockets[0].getsockname()
    print(f'Serving on {addr}')

    async with server:
        await server.serve_forever()


async def tcp_client(message: str):
    reader, writer = await asyncio.open_connection(
        '127.0.0.1', 8888)

    print(f'Send: {message!r}')
    writer.write(message.encode())
    await writer.drain()

    data = await reader.read(100)
    print(f'Received: {data.decode()!r}')

    print('Closing connection')
    writer.close()
    await writer.wait_closed()


async def main():
    # Start the server in the background
    server_task = asyncio.create_task(start_server())

    # Give the server a moment to start
    await asyncio.sleep(1)

    # Run the client
    await tcp_client('Hello, World!')

    # Cancel the server task (otherwise it runs forever)
    server_task.cancel()
    try:
        await server_task
    except asyncio.CancelledError:
        pass


if __name__ == "__main__":
    asyncio.run(main())

the result would looks like

Serving on ('127.0.0.1', 8888)
Send: 'Hello, World!'
Connection from ('0.0.0.0', 0)
Received: Hello, World!
Received: 'Hello, World!'
Closing connection
Connection with ('0.0.0.0', 0) closed

Contributing

Contributions are welcome! Please open issues or pull requests for any bugs or feature requests.

License

This project is licensed under the terms of the MIT license.

TODO

• use registered fd and buffer
• add signal handling
• refactor e2e test
• benchmark
• figure out a way to do unit/integration test