import socket
import asyncore
import traceback

class Server(asyncore.dispatcher):
    def __init__(self, address):
        asyncore.dispatcher.__init__(self)
        self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
        self.set_reuse_addr()
        self.bind(address)
        self.listen(1)

    def handle_accept(self):
        sock, addr = self.accept()
        Writer(sock)
        self.close()

class Writer(asyncore.dispatcher):
    def __init__(self, sock):
        asyncore.dispatcher.__init__(self, sock)

    def handle_write(self):
        self.send(b'\0\0')

class Reader(asyncore.dispatcher):
    def __init__(self, address):
        asyncore.dispatcher.__init__(self)
        self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
        self.connect(address)

    def handle_connect_event(self):
        call_stack = '->'.join((f[2] for f in traceback.extract_stack()))
        print('call stack in handle_connect_event:\n%s' % call_stack)
        asyncore.dispatcher.handle_connect_event(self)

    def handle_read(self):
        print('self.addr after connection: %s' % str(self.addr))
        self.recv(1)
        self.close()

def main():
    address = ('localhost', 3220)
    Server(address)
    Reader(address)
    asyncore.loop(timeout=0.020)

if __name__ == "__main__":
    main()