strange dbus/python callback behavior

[Chris Rebert]

Well, if the the different call sequences are like you say they are, 
then changing:

class GaimControl:
	# Network device activated
	def nm_device_active_cb(self,path):
		self.start_gaim()

to

class GaimControl:
	# Network device activated
	def nm_device_active_cb(self, path, wireless=None):
		self.start_gaim()

should work.

- Chris Rebert

Richard Ferguson wrote:
> A while back I wrote a small app that just sits and listens to
> NetworkManager's dbus signals.  When a device would come up it would start
> Gaim, and when a device would go down it would close Gaim.  Not very
> complex but handy when suspending all the time.
> 
> After recently upgrading to Ubuntu Dapper, my app started showing some
> strange behavior with one of its call backs.
> 
> I have attached my app, but here is my code that connects to dbus.
> 
> ----
> 
> bus = dbus.SystemBus()
> proxy_obj = bus.get_object('org.freedesktop.NetworkManager',
> '/org/freedesktop/NetworkManager')
> dbus_iface = dbus.Interface(proxy_obj, 'org.freedesktop.NetworkManager')
> 
> # Listen for NetworkManager signals
> dbus_iface.connect_to_signal('DeviceNowActive', gc.nm_device_active_cb)
> dbus_iface.connect_to_signal('DeviceNoLongerActive',
> gc.nm_device_notactive_cb)
> 
> ----
> 
> The problem is, sometimes the 'DeviceNowActive' callback,
> gc.nm_device_active_cb, gets called with 2 arguments, and sometimes with 3
> arguments.  I think its 2 for wireline and 3 for wireless.
> 
> Any ideas on why this would happen?  or how to handle it properly?
> Thanks for your help
> 
> richard ferguson
> 
> 
> ------------------------------------------------------------------------
> 
> #!/usr/bin/python
> #
> # nm-gaim-dbus.py - Watch for NetworkManager signals and 
> #                   shutdown/startup gaim when appropriate.
> #
> # Author: Richard Ferguson <gnome at fergusnet.com>
> # 
> # ChangeLog
> # -------- --- -------------------------------------------
> # 11/18/05 RJF Initial Release
> #
> 
> import os
> 
> import gtk
> import dbus
> import dbus.glib
> 
> #######################################
> 
> class GaimControl:
> 	def __init__(self):
> 		self.gaim_was_running = 0
> 
> 	# Launch gaim
> 	def start_gaim(self):
> 		if self.gaim_was_running:
> 			pid = os.fork()
> 			if pid == 0:
> 				os.execlp('gaim', 'gaim')
> 
> 	# Shutdown gaim
> 	def stop_gaim(self):
> 		res = os.system('gaim-remote quit')
> 		if res != 0:
> 			self.gaim_was_running = 0
> 		else:
> 			self.gaim_was_running = 1
> 
> 	# Network device activated
> 	def nm_device_active_cb(self,path):
> 		self.start_gaim()
> 
> 	# Network device deactivated
> 	def nm_device_notactive_cb(self,path):
> 		self.stop_gaim()
> 
> #######################################
> 
> gc = GaimControl()
> 
> # Connect to DBUS
> bus = dbus.SystemBus()
> proxy_obj = bus.get_object('org.freedesktop.NetworkManager', '/org/freedesktop/NetworkManager')
> dbus_iface = dbus.Interface(proxy_obj, 'org.freedesktop.NetworkManager')
> 
> # Listen for NetworkManager signals
> dbus_iface.connect_to_signal('DeviceNowActive', gc.nm_device_active_cb)
> dbus_iface.connect_to_signal('DeviceNoLongerActive', gc.nm_device_notactive_cb)
> 
> # Loop
> gtk.main()
> 
> 
> ------------------------------------------------------------------------
> 
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