annotate src/bridge/bridge_constructor/dbus_core_template.py @ 465:78e67a59d51d

plugin groupblog: added getLastGroupBlogs method
author Goffi <goffi@goffi.org>
date Sat, 24 Mar 2012 17:48:12 +0100
parents cf005701624b
children c97640c90a94
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1 #!/usr/bin/python
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2 #-*- coding: utf-8 -*-
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3
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4 """
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5 SAT: a jabber client
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cf005701624b copyleft date update
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6 Copyright (C) 2009, 2010, 2011, 2012 Jérôme Poisson (goffi@goffi.org)
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7
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8 This program is free software: you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation, either version 3 of the License, or
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11 (at your option) any later version.
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12
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13 This program is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 """
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21
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22
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23 from bridge import Bridge
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24 import dbus
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25 import dbus.service
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26 import dbus.mainloop.glib
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27 from logging import debug, info, error
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28 from twisted.internet.defer import Deferred
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29
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30 const_INT_PREFIX = "org.goffi.SAT" #Interface prefix
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31 const_ERROR_PREFIX = const_INT_PREFIX+".error"
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32 const_OBJ_PATH = '/org/goffi/SAT/bridge'
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33 const_CORE_SUFFIX = ".core"
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34 const_PLUGIN_SUFFIX = ".plugin"
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35
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36 class MethodNotRegistered(dbus.DBusException):
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37 _dbus_error_name = const_ERROR_PREFIX + ".MethodNotRegistered"
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38
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39 class InternalError(dbus.DBusException):
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40 _dbus_error_name = const_ERROR_PREFIX + ".InternalError"
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41
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42 class AsyncNotDeferred(dbus.DBusException):
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43 _dbus_error_name = const_ERROR_PREFIX + ".AsyncNotDeferred"
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44
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45 class DeferredNotAsync(dbus.DBusException):
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46 _dbus_error_name = const_ERROR_PREFIX + ".DeferredNotAsync"
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47
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48 class GenericException(dbus.DBusException):
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49 def __init__(self, twisted_error):
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50 super(GenericException,self).__init__()
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51 mess = twisted_error.getErrorMessage()
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52 self._dbus_error_name = const_ERROR_PREFIX+"."+ (mess or str(err.__class__))
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53
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54 class DbusObject(dbus.service.Object):
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55
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56 def __init__(self, bus, path):
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57 dbus.service.Object.__init__(self, bus, path)
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58 debug("Init DbusObject...")
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59 self.cb={}
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60
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61 def register(self, name, cb):
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62 self.cb[name]=cb
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63
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64 def _callback(self, name, *args, **kwargs):
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65 """call the callback if it exists, raise an exception else
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66 if the callback return a deferred, use async methods"""
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67 if not name in self.cb:
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68 raise MethodNotRegistered
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69
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70 if "callback" in kwargs:
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71 #we must have errback too
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72 if not "errback" in kwargs:
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73 error("errback is missing in method call [%s]" % name)
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74 raise InternalError
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75 callback = kwargs.pop("callback")
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76 errback = kwargs.pop("errback")
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77 async = True
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78 else:
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79 async = False
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80 result = self.cb[name](*args, **kwargs)
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81 if async:
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82 if not isinstance(result, Deferred):
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83 error("Asynchronous method [%s] does not return a Deferred." % name)
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84 raise AsyncNotDeferred
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85 result.addCallback(callback)
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86 result.addErrback(lambda err:errback(GenericException(err)))
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87 else:
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88 if isinstance(result, Deferred):
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89 error("Synchronous method [%s] return a Deferred." % name)
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90 raise DeferredNotAsync
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91 return result
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92
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93 ### signals ###
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94
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95 @dbus.service.signal(const_INT_PREFIX+const_PLUGIN_SUFFIX,
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96 signature='')
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97 def dummySignal(self):
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98 #FIXME: workaround for addSignal (doesn't work if one method doensn't
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99 # already exist for plugins), probably missing some initialisation, need
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100 # further investigations
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101 pass
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102
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103 ##SIGNALS_PART##
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104
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105 ### methods ###
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106
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107 ##METHODS_PART##
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108
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109 def __attributes(self, in_sign):
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110 """Return arguments to user given a in_sign
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111 @param in_sign: in_sign in the short form (using s,a,i,b etc)
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112 @return: list of arguments that correspond to a in_sign (e.g.: "sss" return "arg1, arg2, arg3")"""
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113 i=0
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114 idx=0
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115 attr=[]
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116 while i<len(in_sign):
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117 if in_sign[i] not in ['b','y','n','i','x','q','u','t','d','s','a']:
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118 raise ParseError("Unmanaged attribute type [%c]" % in_sign[i])
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119
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120 attr.append("arg_%i" % idx)
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121 idx+=1
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122
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123 if in_sign[i] == 'a':
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124 i+=1
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125 if in_sign[i]!='{' and in_sign[i]!='(': #FIXME: must manage tuples out of arrays
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126 i+=1
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127 continue #we have a simple type for the array
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128 opening_car = in_sign[i]
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129 assert(opening_car in ['{','('])
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130 closing_car = '}' if opening_car == '{' else ')'
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131 opening_count = 1
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132 while (True): #we have a dict or a list of tuples
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133 i+=1
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134 if i>=len(in_sign):
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135 raise ParseError("missing }")
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136 if in_sign[i] == opening_car:
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137 opening_count+=1
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138 if in_sign[i] == closing_car:
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139 opening_count-=1
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140 if opening_count == 0:
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141 break
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142 i+=1
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143 return attr
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144
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145 def addMethod(self, name, int_suffix, in_sign, out_sign, async=False, doc={}):
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146 """Dynamically add a method to Dbus Bridge"""
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147 _attributes = self.__attributes(in_sign)
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148
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149 if async:
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150 _attributes.extend(['callback','errback'])
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151
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152 attributes = ', '.join(_attributes)
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153
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154 code = compile ('def '+name+' (self,'+attributes+'): return self.cb["'+name+'"]('+attributes+')', '<DBus bridge>','exec')
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155 exec (code)
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156 method = locals()[name]
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157 async_callbacks = ('callback', 'errback') if async else None
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158 setattr(DbusObject, name, dbus.service.method(
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159 const_INT_PREFIX+int_suffix, in_signature=in_sign, out_signature=out_sign,
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160 async_callbacks=async_callbacks)(method))
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161 function = getattr(self, name)
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162 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface]
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163 func_table[function.__name__] = function #Needed for introspection
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164
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165 def addSignal(self, name, int_suffix, signature, doc={}):
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166 """Dynamically add a signal to Dbus Bridge"""
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167 attributes = ', '.join(self.__attributes(signature))
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168
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169 #code = compile ('def '+name+' (self,'+attributes+'): debug ("'+name+' signal")', '<DBus bridge>','exec') #XXX: the debug is too annoying with xmllog
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170 code = compile ('def '+name+' (self,'+attributes+'): pass', '<DBus bridge>','exec')
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171 exec (code)
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172 signal = locals()[name]
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173 setattr(DbusObject, name, dbus.service.signal(
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174 const_INT_PREFIX+int_suffix, signature=signature)(signal))
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175 function = getattr(self, name)
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176 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface]
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177 func_table[function.__name__] = function #Needed for introspection
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178
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179 class DBusBridge(Bridge):
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180 def __init__(self):
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181 dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
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182 Bridge.__init__(self)
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183 info ("Init DBus...")
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184 self.session_bus = dbus.SessionBus()
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185 self.dbus_name = dbus.service.BusName(const_INT_PREFIX, self.session_bus)
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186 self.dbus_bridge = DbusObject(self.session_bus, const_OBJ_PATH)
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187
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188 ##DIRECT_CALLS##
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189
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190 def register(self, name, callback):
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191 debug("registering DBus bridge method [%s]", name)
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192 self.dbus_bridge.register(name, callback)
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193
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194 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}):
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195 """Dynamically add a method to Dbus Bridge"""
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196 print ("Adding method [%s] to DBus bridge" % name)
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197 self.dbus_bridge.addMethod(name, int_suffix, in_sign, out_sign, async, doc)
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198 self.register(name, method)
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199
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200 def addSignal(self, name, int_suffix, signature, doc={}):
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201 self.dbus_bridge.addSignal(name, int_suffix, signature, doc)
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202 setattr(DBusBridge, name, getattr(self.dbus_bridge, name))
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203