aiohttp server with file system based router

app.py

import pkgutil

from aiohttp import web

ALLOWED_METHODS = ["GET", "POST"]

def load_route_handlers(path, mod):
    routes = []
    for method in ALLOWED_METHODS:
        if hasattr(mod, method):
            handler = getattr(mod, method)

            async def async_handler(request):
                response = handler(request)
                if asyncio.iscoroutine(response):
                    response = await response
                if isinstance(response, str):
                    return web.Response(text=response)
                return web.json_response(response)

            logger.info("Loaded route: %s %s", method, path)
            routes.append(getattr(web, method.lower())(path, async_handler))
    return routes


def create_app():
    app = web.Application()
    routes = load_route_handlers("/", of.cli_service.routes)
    for module_info in pkgutil.walk_packages(of.cli_service.routes.__path__):
        mod = module_info.module_finder.find_module(module_info.name).load_module()
        routes += load_route_handlers(f"/{module_info.name.replace('.', '/')}", mod)
    app.add_routes(routes)
    return app