Examples on SlipDBus Trac site do not work.

[awood]

Environment: Fedora 23, Python 2.7.11, python-slip 0.6.4, dbus-python 1.2.0, dbus 1.10.8

The example provided on https://fedorahosted.org/python-slip/wiki/SlipDBusService is not working.

• The Python interpreter throws an error if the scripts are used as it:

  Traceback (most recent call last):
    File "./service.py", line 29, in <module>
      run_service ()
    File "./service.py", line 22, in run_service
      example_object = example_object.ExampleObject (name, "/org/example/ExampleObject")
  UnboundLocalError: local variable 'example_object' referenced before assignment
  

• Renaming that variable leads to a service that just times out.

  % ./service.py &
  [1] 20622
  Running the example dbus service at 'org.example.ExampleService'.
  % dbus-send --session --print-reply --type=method_call --dest='org.example.ExampleService' '/org/example/ExampleObject' org.example.ExampleObject.hello_world  
  Error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
  [1]  + 20622 done       ./service.py  
  

  Walking through with the debugger, it looks like when slip adds the ASYNC_CALLBACKS tuple, those values confuse dbus.service into thinking the method is an async method. It looks like slip is attempting to remove those dummy ASYNC_CALLBACKS values if the method is not async, but it's not working. When the code returns to

  # we're done - the method has got callback functions to reply with
  if parent_method._dbus_async_callbacks:
      return
  

  in dbus.service, parent_method still has values in the _dbus_async_callbacks tuple.