examples/example-async-client.py

   1 #!/usr/bin/env python
   2
   3 usage = """Usage:
   4 python example-service.py &
   5 python example-async-client.py
   6 python example-client.py --exit-service
   7 """
   8
   9 # Copyright (C) 2004-2006 Red Hat Inc. <http://www.redhat.com/>
  10 # Copyright (C) 2005-2007 Collabora Ltd. <http://www.collabora.co.uk/>
  11 #
  12 # Permission is hereby granted, free of charge, to any person
  13 # obtaining a copy of this software and associated documentation
  14 # files (the "Software"), to deal in the Software without
  15 # restriction, including without limitation the rights to use, copy,
  16 # modify, merge, publish, distribute, sublicense, and/or sell copies
  17 # of the Software, and to permit persons to whom the Software is
  18 # furnished to do so, subject to the following conditions:
  19 #
  20 # The above copyright notice and this permission notice shall be
  21 # included in all copies or substantial portions of the Software.
  22 #
  23 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  27 # HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  28 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  29 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  30 # DEALINGS IN THE SOFTWARE.
  31
  32 import sys
  33 import traceback
  34
  35 import gobject
  36
  37 import dbus
  38 import dbus.mainloop.glib
  39
  40 # Callbacks for asynchronous calls
  41
  42 def handle_hello_reply(r):
  43     global hello_replied
  44     hello_replied = True
  45
  46     print str(r)
  47
  48     if hello_replied and raise_replied:
  49         loop.quit()
  50
  51 def handle_hello_error(e):
  52     global failed
  53     global hello_replied
  54     hello_replied = True
  55     failed = True
  56
  57     print "HelloWorld raised an exception! That's not meant to happen..."
  58     print "\t", str(e)
  59
  60     if hello_replied and raise_replied:
  61         loop.quit()
  62
  63 def handle_hello_error(e):
  64     global failed
  65     global hello_replied
  66     hello_replied = True
  67     failed = True
  68
  69     print "HelloWorld raised an exception! That's not meant to happen..."
  70     print "\t", str(e)
  71
  72     if hello_replied and raise_replied:
  73         loop.quit()
  74
  75 def handle_raise_reply():
  76     global failed
  77     global raise_replied
  78     raise_replied = True
  79     failed = True
  80
  81     print "RaiseException returned normally! That's not meant to happen..."
  82
  83     if hello_replied and raise_replied:
  84         loop.quit()
  85
  86 def handle_raise_error(e):
  87     global raise_replied
  88     raise_replied = True
  89
  90     print "RaiseException raised an exception as expected:"
  91     print "\t", str(e)
  92
  93     if hello_replied and raise_replied:
  94         loop.quit()
  95
  96 def make_calls():
  97     # To make an async call, use the reply_handler and error_handler kwargs
  98     remote_object.HelloWorld("Hello from example-async-client.py!",
  99                              dbus_interface='com.example.SampleInterface',
 100                              reply_handler=handle_hello_reply,
 101                              error_handler=handle_hello_error)
 102
 103     # Interface objects also support async calls
 104     iface = dbus.Interface(remote_object, 'com.example.SampleInterface')
 105
 106     iface.RaiseException(reply_handler=handle_raise_reply,
 107                          error_handler=handle_raise_error)
 108
 109     return False
 110
 111 if __name__ == '__main__':
 112     dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
 113
 114     bus = dbus.SessionBus()
 115     try:
 116         remote_object = bus.get_object("com.example.SampleService","/SomeObject")
 117     except dbus.DBusException:
 118         traceback.print_exc()
 119         print usage
 120         sys.exit(1)
 121
 122     # Make the method call after a short delay
 123     gobject.timeout_add(1000, make_calls)
 124
 125     failed = False
 126     hello_replied = False
 127     raise_replied = False
 128
 129     loop = gobject.MainLoop()
 130     loop.run()
 131     if failed:
 132         raise SystemExit("Example async client failed!")