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"""Simple example demonstrating the use of the socket monitoring feature."""
# This file is part of pyzmq.
#
# Distributed under the terms of the New BSD License. The full
# license is in the file LICENSE.BSD, distributed as part of this
# software.
__author__ = 'Guido Goldstein'
import threading
import time
from typing import Any, Dict
import zmq
from zmq.utils.monitor import recv_monitor_message
def line() -> None:
print('-' * 40)
print(f"libzmq-{zmq.zmq_version()}")
if zmq.zmq_version_info() < (4, 0):
raise RuntimeError("monitoring in libzmq version < 4.0 is not supported")
EVENT_MAP = {}
print("Event names:")
for name in dir(zmq):
if name.startswith('EVENT_'):
value = getattr(zmq, name)
print(f"{name:21} : {value:4}")
EVENT_MAP[value] = name
def event_monitor(monitor: zmq.Socket) -> None:
while monitor.poll():
evt: Dict[str, Any] = {}
mon_evt = recv_monitor_message(monitor)
evt.update(mon_evt)
evt['description'] = EVENT_MAP[evt['event']]
print(f"Event: {evt}")
if evt['event'] == zmq.EVENT_MONITOR_STOPPED:
break
monitor.close()
print()
print("event monitor thread done!")
ctx = zmq.Context.instance()
rep = ctx.socket(zmq.REP)
req = ctx.socket(zmq.REQ)
monitor = req.get_monitor_socket()
t = threading.Thread(target=event_monitor, args=(monitor,))
t.start()
line()
print("bind req")
req.bind("tcp://127.0.0.1:6666")
req.bind("tcp://127.0.0.1:6667")
time.sleep(1)
line()
print("connect rep")
rep.connect("tcp://127.0.0.1:6667")
time.sleep(0.2)
rep.connect("tcp://127.0.0.1:6666")
time.sleep(1)
line()
print("disconnect rep")
rep.disconnect("tcp://127.0.0.1:6667")
time.sleep(1)
rep.disconnect("tcp://127.0.0.1:6666")
time.sleep(1)
line()
print("close rep")
rep.close()
time.sleep(1)
line()
print("disabling event monitor")
req.disable_monitor()
line()
print("event monitor thread should now terminate")
# Create a new socket to connect to listener, no more
# events should be observed.
rep = ctx.socket(zmq.REP)
line()
print("connect rep")
rep.connect("tcp://127.0.0.1:6667")
time.sleep(0.2)
line()
print("disconnect rep")
rep.disconnect("tcp://127.0.0.1:6667")
time.sleep(0.2)
line()
print("close rep")
rep.close()
line()
print("close req")
req.close()
print("END")
ctx.term()
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