test2.py

        request_closed = False
        channel_closed = False
        while True:
            r, w, x = select.select([self.request, chan], [], [])
            if self.request in r:
                data = self.request.recv(10240)
                if len(data) == 0:
                    request_closed = True
                else:
                    chan.send(data)
            if chan in r:
                data = chan.recv(10240)
                if len(data) == 0:
                    channel_closed = True
                else:
                    self.request.send(data)

            if request_closed and channel_closed:
                break