vcs.maemo.org Git - dbuscron/blob - dbuscron/bus.py

   1 from __future__ import with_statement
   2
   3 import dbus, os
   4
   5 from dbuscron.logger import Logger
   6 log = Logger(__name__)
   7
   8 def dbus_to_str(value):
   9     try:
  10         if isinstance(value, dbus.Byte):
  11             result = str(int(value))
  12         elif isinstance(value, dbus.ByteArray):
  13             result = ','.join(str(ord(v)) for v in value)
  14         elif isinstance(value, dbus.Array):
  15             result = ','.join(dbus_to_str(v) for v in value)
  16         elif isinstance(value, dbus.Dictionary):
  17             result = ','.join('%s:%s' % (k, dbus_to_str(v)) for k, v in value.iteritems())
  18         elif isinstance(value, dbus.String):
  19             result = value.encode('utf-8')
  20         else:
  21             result = str(value)
  22         return result
  23     except Exception, e:
  24         log.error('convert exception', e)
  25         raise e
  26
  27 def get_dbus_message_type(message):
  28     result = message.__class__.__name__[0:-7]
  29     for c in 'ABCDEFGHIJKLMNOPQRSTUVWXYZ':
  30         result = result.replace(c, '_'+c.lower())
  31     return result.strip('_')
  32
  33 class DbusBus(object):
  34     __bus = None
  35     __system_bus = None
  36     __session_bus = None
  37
  38     def __new__(cls, *args, **kw):
  39         if not cls.__bus:
  40             cls.__bus = super(DbusBus, cls).__new__(cls)
  41         return cls.__bus
  42
  43     def __init__(self, session_bus_address=None):
  44         if session_bus_address:
  45             self.set_session_bus_address(session_bus_address)
  46         else:
  47             self.get_session_bus_address()
  48
  49         from dbus.mainloop.glib import DBusGMainLoop
  50         DBusGMainLoop(set_as_default=True)
  51
  52     def set_session_bus_address(self, value):
  53         os.environ['DBUS_SESSION_BUS_ADDRESS'] = str(value)
  54
  55     def get_session_bus_address(self):
  56         try:
  57             return os.environ['DBUS_SESSION_BUS_ADDRESS']
  58         except KeyError:
  59             with open('/tmp/session_bus_address.user', 'rb') as f:
  60                 session_bus_address = f.readline().strip().split('=', 1).pop().strip("'\"")
  61                 os.environ['DBUS_SESSION_BUS_ADDRESS'] = session_bus_address
  62                 log('session bus address aquired', session_bus_address)
  63                 return session_bus_address
  64
  65     session_bus_address = property(get_session_bus_address, set_session_bus_address)
  66
  67     @property
  68     def system(self):
  69         if not self.__system_bus:
  70             self.__system_bus = dbus.SystemBus()
  71         return self.__system_bus
  72
  73     @property
  74     def session(self):
  75         if not self.__session_bus:
  76             self.__session_bus = dbus.SessionBus()
  77         return self.__session_bus
  78
  79     def attach_handler(self, handler):
  80         if self.__system_bus:
  81             self.__system_bus.add_message_filter(handler)
  82         if self.__session_bus:
  83             self.__session_bus.add_message_filter(handler)
  84     def listen(self):
  85         from gobject import MainLoop
  86         loop = MainLoop()
  87         loop.run()
  88
  89 class DbusRule(object):
  90     def __init__(self, bus_=None, type_=None, sender_=None, interface_=None, path_=None, member_=None, destination_=None, args_=[]):
  91         self._bus         = bus_
  92         self._type        = type_
  93         self._sender      = sender_
  94         self._interface   = interface_
  95         self._path        = path_
  96         self._member      = member_
  97         self._destination = destination_
  98         self._args        = args_
  99
 100     def register(self):
 101         rule = str(self)
 102         if rule:
 103             self._bus.add_match_string(rule)
 104
 105     def unregister(self):
 106         rule = str(self)
 107         if rule:
 108             self._bus.remove_match_string(rule)
 109
 110     def __del__(self):
 111        self.unregister()
 112
 113     def __str__(self):
 114         rule = []
 115         for key in ['type', 'sender', 'interface', 'path', 'member', 'destination']:
 116             value = getattr(self, '_'+key)
 117             if value is not None:
 118                 rule.append("%s='%s'" % (key, value))
 119
 120         if self._args:
 121             for i, arg in enumerate(self._args):
 122                 rule.append("arg%d%s='%s'" % (i, 'path' if arg.startswith('/') else '', arg))
 123
 124         return ','.join(rule)
 125
 126     def match(self, bus, message):
 127
 128         if self._bus not in (None, bus):
 129             return False
 130
 131         if self._type is not None:
 132             type_ = get_dbus_message_type(message)
 133             if self._type != type_:
 134                 return False
 135
 136         if self._sender not in (None, message.get_sender()):
 137             return False
 138
 139         if self._interface not in (None, message.get_interface()):
 140             return False
 141
 142         if self._path not in (None, message.get_path()):
 143             return False
 144
 145         if self._member not in (None, message.get_member()):
 146             return False
 147
 148         if self._destination not in (None, message.get_destination()):
 149             return False
 150
 151         if self._args is not None:
 152             args_ = message.get_args_list()
 153             for i, arg in enumerate(args_):
 154                 if i >= len(self._args):
 155                     break
 156                 if self._args[i] not in (None, dbus_to_str(arg)):
 157                     return False
 158
 159         return True
 160