test_discovery.py 文件源码

def test_beacon_already_running():
    #
    # NB this one has to run without the beacon fixture
    #
    # Bind a socket on a random port before attempting
    # to start a beacon on that same port.
    #
    port = random.choice(nw0.config.DYNAMIC_PORTS)
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
    s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
    s.bind(("", port))
    try:
        assert nw0.discovery._beacon is None
        nw0.discovery._start_beacon(port=port)
        assert nw0.discovery._beacon is nw0.discovery._remote_beacon
    finally:
        s.close()
        #
        # Make sure any future beacon use assumes it's not
        # already running.
        #
        nw0.discovery._stop_beacon()