import invest from dbus.mainloop.glib import DBusGMainLoop import dbus # possible states, see http://projects.mate.org/NetworkManager/developers/spec-08.html#type-NM_STATE STATE_UNKNOWN = dbus.UInt32(0) STATE_ASLEEP = dbus.UInt32(1) STATE_CONNECTING = dbus.UInt32(2) STATE_CONNECTED = dbus.UInt32(3) STATE_DISCONNEDTED = dbus.UInt32(4) class NetworkManager: def __init__(self): self.state = STATE_UNKNOWN self.statechange_callback = None try: # get an event loop loop = DBusGMainLoop() # get the NetworkManager object from D-Bus invest.debug("Connecting to Network Manager via D-Bus") bus = dbus.SystemBus(mainloop=loop) nmobj = bus.get_object('org.freedesktop.NetworkManager', '/org/freedesktop/NetworkManager') nm = dbus.Interface(nmobj, 'org.freedesktop.NetworkManager') # connect the signal handler to the bus bus.add_signal_receiver(self.handler, None, 'org.freedesktop.NetworkManager', 'org.freedesktop.NetworkManager', '/org/freedesktop/NetworkManager') # get the current status of the network manager self.state = nm.state() invest.debug("Current Network Manager status is %d" % self.state) except Exception, msg: invest.error("Could not connect to the Network Manager: %s" % msg ) def online(self): return self.state == STATE_UNKNOWN or self.state == STATE_CONNECTED def offline(self): return not self.online() # the signal handler for signals from the network manager def handler(self,signal=None): if isinstance(signal, dict): state = signal.get('State') if state != None: invest.debug("Network Manager change state %d => %d" % (self.state, state) ); self.state = state # notify about state change if self.statechange_callback != None: self.statechange_callback() def set_statechange_callback(self,handler): self.statechange_callback = handler