python使用zeromq实现多进程简单poll复用

参考：https://learning-0mq-with-pyzmq.readthedocs.io/en/latest/pyzmq/multisocket/zmqpoller.html
实现zmqpolling.py.py

import zmq
import time
import sys
import random
from  multiprocessing import Process

def server_push(port="5556"):
	context = zmq.Context()
	socket = context.socket(zmq.PUSH)
	socket.bind("tcp://*:%s" % port)
	print("Running server on port: ", port)
	# serves only 5 request and dies
	for reqnum in range(10):
		if reqnum < 6:
			socket.send("Continue".encode("ascii") )
		else:
			socket.send("Exit".encode("ascii") )
			break
		time.sleep (1)

def server_pub(port="5558"):
	context = zmq.Context()
	socket = context.socket(zmq.PUB)
	socket.bind("tcp://*:%s" % port)
	publisher_id = random.randrange(0,9999)
	print ("Running server on port: ", port)
	# serves only 5 request and dies
	for reqnum in range(10):
		# Wait for next request from client
		topic = random.randrange(8,10)
		messagedata = "server#%s" % publisher_id
		print("%s %s" % (topic, messagedata))
		socket.send( ("%d %s" % (topic, messagedata)).encode("ascii") )
		time.sleep(1)  

def client(port_push, port_sub):
	context = zmq.Context()
	socket_pull = context.socket(zmq.PULL)
	socket_pull.connect ("tcp://localhost:%s" % port_push)
	print ("Connected to server with port %s" % port_push)
	socket_sub = context.socket(zmq.SUB)
	socket_sub.connect ("tcp://localhost:%s" % port_sub)
	socket_sub.setsockopt(zmq.SUBSCRIBE, "9".encode("ascii") )
	print ("Connected to publisher with port %s" % port_sub)
	# Initialize poll set
	poller = zmq.Poller()
	poller.register(socket_pull, zmq.POLLIN)
	poller.register(socket_sub, zmq.POLLIN)
	# Work on requests from both server and publisher
	should_continue = True
	while should_continue:
		socks = dict(poller.poll())
		if socket_pull in socks and socks[socket_pull] == zmq.POLLIN:
			message = socket_pull.recv()
			print ("Recieved control command: %s" % message)
		if message == "Exit": 
			print ("Recieved exit command, client will stop recieving messages")
			should_continue = False

		if socket_sub in socks and socks[socket_sub] == zmq.POLLIN:
			string = socket_sub.recv()
			topic, messagedata = string.split()
			print("Processing ... ", topic, messagedata)



if __name__ == "__main__":
	# Now we can run a few servers 
	server_push_port = "5556"
	server_pub_port = "5558"
	Process(target=server_push, args=(server_push_port,)).start()
	Process(target=server_pub, args=(server_pub_port,)).start()
	Process(target=client, args=(server_push_port,server_pub_port,)).start()

运行：
#python3 zmqpolling.py.py