#!/usr/bin/env python3

import asyncio
import aiohttp
from functools import partial

from some_event_based_library import EventNotifier


class MyBackend(EventNotifier):
    @asyncio.coroutine
    def get_url(self, url, event):
        rep = yield from aiohttp.request('get', url)
        text = yield from rep.text()
        # do  stuff
        self.send_message(to=event.get('from'), body=text)

def init(loop):
    mybackend = MyBackend(loop=loop)
    mybackend.add_event_handler('event', partial(mybackend.get_url, 'http://python.org'))
    mybackend.add_event_handler('other_event', partial(mybackend.get_url, 'http://www.python.org'))

LOOP = asyncio.get_event_loop()
LOOP.call_soon(init, LOOP)
LOOP.run_forever()