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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
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