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"""Demonstrate using zmq.proxy device for message relay"""
# This example is placed in the Public Domain
# It may also be used under the Creative Commons CC-0 License, (C) PyZMQ Developers
import time
from threading import Thread
import zmq
MSGS = 10
PRODUCERS = 2
def produce(url, ident):
"""Produce messages"""
ctx = zmq.Context.instance()
s = ctx.socket(zmq.PUSH)
s.connect(url)
print(f"Producing {ident}")
for i in range(MSGS):
s.send((f'{ident}: {time.time():.0f}').encode())
time.sleep(1)
print(f"Producer {ident} done")
s.close()
def consume(url):
"""Consume messages"""
ctx = zmq.Context.instance()
s = ctx.socket(zmq.PULL)
s.connect(url)
print("Consuming")
for i in range(MSGS * PRODUCERS):
msg = s.recv()
print(msg.decode('ascii'))
print("Consumer done")
s.close()
def proxy(in_url, out_url):
ctx = zmq.Context.instance()
in_s = ctx.socket(zmq.PULL)
in_s.bind(in_url)
out_s = ctx.socket(zmq.PUSH)
out_s.bind(out_url)
try:
zmq.proxy(in_s, out_s)
except zmq.ContextTerminated:
print("proxy terminated")
in_s.close()
out_s.close()
in_url = 'tcp://127.0.0.1:5555'
out_url = 'tcp://127.0.0.1:5556'
consumer = Thread(target=consume, args=(out_url,))
proxy_thread = Thread(target=proxy, args=(in_url, out_url))
producers = [Thread(target=produce, args=(in_url, i)) for i in range(PRODUCERS)]
consumer.start()
proxy_thread.start()
for p in producers:
p.start()
consumer.join()
zmq.Context.instance().term()
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