python 3.x - Set identity to several ZMQ servers, binded to same port -


i implementing zmq dealer-router pattern in python 3.4. code zmq guide core of program.
sets identity each client (ex. 1,2,3,4). however, if start same number of server workers, not paired clients. 1 server worker may respond clients different identities.
question is: how set identities each server worker, server worker 1 interacts client 1? more precisely, need 4 clients interacting 4 server workers via 1 single port in paired manner.

i answer own question.
enough modify previous code set paired interactions:
1. pass id parameter in servertask class set server worker identity
2. change backend dealer router
 whole system interacts in asynchronous pattern. i'll post whole script:

import zmq import sys import threading import time random import randint, random  def tprint(msg):     """like print, won't newlines confused multiple threads"""     sys.stdout.write(msg + '\n')     sys.stdout.flush()  class clienttask(threading.thread):     """clienttask"""     def __init__(self, id):     self.id = id     threading.thread.__init__ (self)      def run(self):         context = zmq.context()         socket = context.socket(zmq.dealer)         identity = str(self.id)         socket.identity = identity.encode('ascii')         socket.connect('tcp://localhost:5570')         print('client %s started' % (identity))         poll = zmq.poller()         poll.register(socket, zmq.pollin)         reqs = 0         in range(3):             reqs = reqs + 1             print('client %s sent req #%d..' % (identity, reqs))             socket.send_string(u'request #%d' % (reqs))             in range(3):                 sockets = dict(poll.poll(1000))                 if socket in sockets:                     msg = socket.recv()                     tprint('client %s received: %s' % (identity, msg))          socket.close()         context.term()  class servertask(threading.thread):     """servertask"""     def __init__(self):         threading.thread.__init__ (self)      def run(self):         context = zmq.context()         frontend = context.socket(zmq.router)         frontend.bind('tcp://*:5570')          backend = context.socket(zmq.router)               backend.bind('inproc://backend')          workers = []         in range(1,4):             worker = serverworker(context, i)             worker.start()             workers.append(worker)          zmq.proxy(frontend, backend)          frontend.close()         backend.close()         context.term()  class serverworker(threading.thread):     """serverworker"""     def __init__(self, context, id):         threading.thread.__init__ (self)         self.context = context         self.id = id      def run(self):         worker = self.context.socket(zmq.dealer)         identity = str(self.id)         worker.connect('inproc://backend')         tprint('worker %s started' % identity)         in range(3):             client_ident, msg = worker.recv_multipart()             tprint('worker %s received %s %s' % (identity, msg, client_ident))             in range(2):                 time.sleep(1. / (randint(1,10)))                 worker.send_multipart([client_ident, msg])          worker.close()  def main():     """main function"""     server = servertask()     server.start()     in range(1,4):         client = clienttask(i)         client.start()      server.join()  if __name__ == "__main__":     main()

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