event driven io explained

udpserver.py

import socket
import time

from eventhandler import EventHandler, event_loop

class UDPServer(EventHandler):
    def __init__(self, address):
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.sock.bind(address)

    def fileno(self):
        return self.sock.fileno()

    def wants_to_receive(self):
        return True

class UDPTimeServer(UDPServer):
    def handle_receive(self):
        msg, addr = self.sock.recvfrom(1)
        self.sock.sendto(time.ctime().encode('ascii'), addr)

class UDPEchoServer(UDPServer):
    def handle_receive(self):
        msg, addr = self.sock.recvfrom(8192)
        self.sock.sendto(msg, addr)

if __name__ == '__main__':
    handlers = [ UDPTimeServer(('',14000)), UDPEchoServer(('',15000))  ]
    event_loop(handlers)