How can I wrap a synchronous function in an async coroutine?

Question

I\'m using aiohttp to build an API server that sends TCP requests off to a seperate server. The module that sends the TCP requests is synchronous and a black box for my purposes

Answer 1

You can use a decorator to wrap the sync version to an async version.

import time
from functools import wraps, partial


def wrap(func):
    @wraps(func)
    async def run(*args, loop=None, executor=None, **kwargs):
        if loop is None:
            loop = asyncio.get_event_loop()
        pfunc = partial(func, *args, **kwargs)
        return await loop.run_in_executor(executor, pfunc)
    return run

@wrap
def sleep_async(delay):
    time.sleep(delay)
    return 'I slept asynchronously'

or use the aioify library

% pip install aioify

then

@aioify
def sleep_async(delay):
    pass