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

   1 from __future__ import with_statement
   2
   3 import dbus, os
   4 from fnmatch import fnmatch
   5
   6 from dbuscron.logger import Logger
   7 log = Logger(__name__)
   8
   9 def dbus_to_str(value):
  10     try:
  11         if isinstance(value, dbus.Byte):
  12             result = str(int(value))
  13         elif isinstance(value, dbus.ByteArray):
  14             result = ','.join(str(ord(v)) for v in value)
  15         elif isinstance(value, dbus.Array):
  16             result = ','.join(dbus_to_str(v) for v in value)
  17         elif isinstance(value, dbus.Dictionary):
  18             result = ','.join('%s:%s' % (k, dbus_to_str(v)) for k, v in value.iteritems())
  19         elif isinstance(value, dbus.String):
  20             result = value.encode('utf-8')
  21         else:
  22             result = str(value)
  23         return result
  24     except Exception, e:
  25         log.error('convert exception', e)
  26         raise e
  27
  28 def get_dbus_message_type(message):
  29     result = message.__class__.__name__[0:-7]
  30     for c in 'ABCDEFGHIJKLMNOPQRSTUVWXYZ':
  31         result = result.replace(c, '_'+c.lower())
  32     return result.strip('_')
  33
  34 class DbusBus(object):
  35     __bus = None
  36     __system_bus = None
  37     __session_bus = None
  38
  39     def __new__(cls, *args, **kw):
  40         if not cls.__bus:
  41             cls.__bus = super(DbusBus, cls).__new__(cls)
  42         return cls.__bus
  43
  44     def __init__(self, session_bus_address=None):
  45         if session_bus_address:
  46             self.set_session_bus_address(session_bus_address)
  47         else:
  48             self.get_session_bus_address()
  49
  50         from dbus.mainloop.glib import DBusGMainLoop
  51         DBusGMainLoop(set_as_default=True)
  52
  53     def set_session_bus_address(self, value):
  54         os.environ['DBUS_SESSION_BUS_ADDRESS'] = str(value)
  55
  56     def get_session_bus_address(self):
  57         try:
  58             return os.environ['DBUS_SESSION_BUS_ADDRESS']
  59         except KeyError:
  60             with open('/tmp/session_bus_address.user', 'rb') as f:
  61                 session_bus_address = f.readline().strip().split('=', 1).pop().strip("'\"")
  62                 os.environ['DBUS_SESSION_BUS_ADDRESS'] = session_bus_address
  63                 log('session bus address aquired', session_bus_address)
  64                 return session_bus_address
  65
  66     session_bus_address = property(get_session_bus_address, set_session_bus_address)
  67
  68     @property
  69     def system(self):
  70         if not self.__system_bus:
  71             self.__system_bus = dbus.SystemBus()
  72         return self.__system_bus
  73
  74     @property
  75     def session(self):
  76         if not self.__session_bus:
  77             self.__session_bus = dbus.SessionBus()
  78         return self.__session_bus
  79
  80     def attach_handler(self, handler):
  81         if self.__system_bus:
  82             self.__system_bus.add_message_filter(handler)
  83         if self.__session_bus:
  84             self.__session_bus.add_message_filter(handler)
  85     def listen(self):
  86         from gobject import MainLoop
  87         loop = MainLoop()
  88         loop.run()
  89
  90 class DbusRule(object):
  91     def __init__(self, bus_=None, type_=None, sender_=None, interface_=None, path_=None, member_=None, destination_=None, args_=[]):
  92         self._bus         = bus_
  93         self._type        = type_
  94         self._sender      = sender_
  95         self._interface   = interface_
  96         self._path        = path_
  97         self._member      = member_
  98         self._destination = destination_
  99         self._args        = args_
 100
 101     def register(self):
 102         rule = str(self)
 103         if rule:
 104             self._bus.add_match_string(rule)
 105
 106     def unregister(self):
 107         rule = str(self)
 108         if rule:
 109             self._bus.remove_match_string(rule)
 110
 111     def __del__(self):
 112        self.unregister()
 113
 114     def __str__(self):
 115         rule = []
 116         for key in ['type', 'sender', 'interface', 'path', 'member', 'destination']:
 117             value = getattr(self, '_'+key)
 118             if value is not None:
 119                 rule.append("%s='%s'" % (key, value))
 120
 121         if self._args:
 122             for i, arg in enumerate(self._args):
 123                 rule.append("arg%d%s='%s'" % (i, 'path' if arg.startswith('/') else '', arg))
 124
 125         return ','.join(rule)
 126
 127     def match(self, bus, message):
 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                 a = dbus_to_str(arg)
 157                 if self._args[i] not in (None, a):
 158                     if not fnmatch(a, self._args[i]):
 159                         return False
 160
 161         return True
 162