Mercurial > libervia-backend
annotate src/bridge/bridge_constructor/dbus_core_template.py @ 731:80c1072390f3
plugin microbloging: fixes bad calls
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Fri, 13 Dec 2013 17:18:29 +0100 |
| parents | d207c2186519 |
| children | 1def5b7edf9f |
| rev | line source |
|---|---|
| 267 | 1 #!/usr/bin/python |
| 2 #-*- coding: utf-8 -*- | |
| 3 | |
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4 # SAT: a jabber client |
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013 Jérôme Poisson (goffi@goffi.org) |
| 267 | 6 |
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7 # This program is free software: you can redistribute it and/or modify |
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8 # it under the terms of the GNU Affero General Public License as published by |
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9 # the Free Software Foundation, either version 3 of the License, or |
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10 # (at your option) any later version. |
| 267 | 11 |
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12 # This program is distributed in the hope that it will be useful, |
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 # GNU Affero General Public License for more details. |
| 267 | 16 |
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17 # You should have received a copy of the GNU Affero General Public License |
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 267 | 19 |
| 20 from bridge import Bridge | |
| 21 import dbus | |
| 22 import dbus.service | |
| 23 import dbus.mainloop.glib | |
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24 import inspect |
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25 from logging import debug, info, error |
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26 from twisted.internet.defer import Deferred |
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27 from sat.core.exceptions import BridgeInitError |
| 267 | 28 |
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29 const_INT_PREFIX = "org.goffi.SAT" # Interface prefix |
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30 const_ERROR_PREFIX = const_INT_PREFIX + ".error" |
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31 const_OBJ_PATH = '/org/goffi/SAT/bridge' |
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32 const_CORE_SUFFIX = ".core" |
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33 const_PLUGIN_SUFFIX = ".plugin" |
| 267 | 34 |
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35 |
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36 class ParseError(Exception): |
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37 pass |
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38 |
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39 |
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40 class MethodNotRegistered(dbus.DBusException): |
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41 _dbus_error_name = const_ERROR_PREFIX + ".MethodNotRegistered" |
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42 |
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43 |
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44 class InternalError(dbus.DBusException): |
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45 _dbus_error_name = const_ERROR_PREFIX + ".InternalError" |
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46 |
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47 |
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48 class AsyncNotDeferred(dbus.DBusException): |
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49 _dbus_error_name = const_ERROR_PREFIX + ".AsyncNotDeferred" |
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50 |
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51 |
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52 class DeferredNotAsync(dbus.DBusException): |
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53 _dbus_error_name = const_ERROR_PREFIX + ".DeferredNotAsync" |
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54 |
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55 |
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56 class GenericException(dbus.DBusException): |
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57 def __init__(self, twisted_error): |
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58 super(GenericException, self).__init__() |
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59 mess = twisted_error.getErrorMessage() |
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60 self._dbus_error_name = const_ERROR_PREFIX + "." + (mess or str(twisted_error.__class__)) |
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61 |
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62 |
| 267 | 63 class DbusObject(dbus.service.Object): |
| 64 | |
| 65 def __init__(self, bus, path): | |
| 66 dbus.service.Object.__init__(self, bus, path) | |
| 67 debug("Init DbusObject...") | |
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68 self.cb = {} |
| 267 | 69 |
| 70 def register(self, name, cb): | |
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71 self.cb[name] = cb |
| 267 | 72 |
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73 def _callback(self, name, *args, **kwargs): |
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74 """call the callback if it exists, raise an exception else |
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75 if the callback return a deferred, use async methods""" |
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76 if not name in self.cb: |
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77 raise MethodNotRegistered |
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78 |
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79 if "callback" in kwargs: |
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80 #we must have errback too |
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81 if not "errback" in kwargs: |
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82 error("errback is missing in method call [%s]" % name) |
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83 raise InternalError |
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84 callback = kwargs.pop("callback") |
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85 errback = kwargs.pop("errback") |
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86 async = True |
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87 else: |
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88 async = False |
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89 result = self.cb[name](*args, **kwargs) |
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90 if async: |
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91 if not isinstance(result, Deferred): |
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92 error("Asynchronous method [%s] does not return a Deferred." % name) |
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93 raise AsyncNotDeferred |
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94 result.addCallback(lambda result: callback() if result is None else callback(result)) |
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95 result.addErrback(lambda err: errback(GenericException(err))) |
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96 else: |
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97 if isinstance(result, Deferred): |
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98 error("Synchronous method [%s] return a Deferred." % name) |
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99 raise DeferredNotAsync |
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100 return result |
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101 ### signals ### |
| 267 | 102 |
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103 @dbus.service.signal(const_INT_PREFIX + const_PLUGIN_SUFFIX, |
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104 signature='') |
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105 def dummySignal(self): |
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106 #FIXME: workaround for addSignal (doesn't work if one method doensn't |
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107 # already exist for plugins), probably missing some initialisation, need |
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108 # further investigations |
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109 pass |
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110 |
| 267 | 111 ##SIGNALS_PART## |
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112 ### methods ### |
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113 |
| 267 | 114 ##METHODS_PART## |
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115 def __attributes(self, in_sign): |
| 267 | 116 """Return arguments to user given a in_sign |
| 117 @param in_sign: in_sign in the short form (using s,a,i,b etc) | |
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118 @return: list of arguments that correspond to a in_sign (e.g.: "sss" return "arg1, arg2, arg3")""" |
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119 i = 0 |
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120 idx = 0 |
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121 attr = [] |
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122 while i < len(in_sign): |
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123 if in_sign[i] not in ['b', 'y', 'n', 'i', 'x', 'q', 'u', 't', 'd', 's', 'a']: |
| 267 | 124 raise ParseError("Unmanaged attribute type [%c]" % in_sign[i]) |
| 125 | |
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126 attr.append("arg_%i" % idx) |
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127 idx += 1 |
| 267 | 128 |
| 129 if in_sign[i] == 'a': | |
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130 i += 1 |
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131 if in_sign[i] != '{' and in_sign[i] != '(': # FIXME: must manage tuples out of arrays |
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132 i += 1 |
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133 continue # we have a simple type for the array |
| 267 | 134 opening_car = in_sign[i] |
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135 assert(opening_car in ['{', '(']) |
| 267 | 136 closing_car = '}' if opening_car == '{' else ')' |
| 137 opening_count = 1 | |
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138 while (True): # we have a dict or a list of tuples |
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139 i += 1 |
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140 if i >= len(in_sign): |
| 267 | 141 raise ParseError("missing }") |
| 142 if in_sign[i] == opening_car: | |
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143 opening_count += 1 |
| 267 | 144 if in_sign[i] == closing_car: |
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145 opening_count -= 1 |
| 267 | 146 if opening_count == 0: |
| 147 break | |
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148 i += 1 |
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149 return attr |
| 267 | 150 |
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151 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False): |
| 267 | 152 """Dynamically add a method to Dbus Bridge""" |
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153 inspect_args = inspect.getargspec(method) |
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154 |
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155 _arguments = inspect_args.args |
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156 _defaults = list(inspect_args.defaults or []) |
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157 |
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158 if inspect.ismethod(method): |
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159 #if we have a method, we don't want the first argument (usually 'self') |
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160 del(_arguments[0]) |
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161 |
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162 #first arguments are for the _callback method |
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163 arguments_callback = ', '.join([repr(name)] + ((_arguments + ['callback=callback', 'errback=errback']) if async else _arguments)) |
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164 |
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165 if async: |
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166 _arguments.extend(['callback', 'errback']) |
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167 _defaults.extend([None, None]) |
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168 |
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169 #now we create a second list with default values |
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170 for i in range(1, len(_defaults) + 1): |
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171 _arguments[-i] = "%s = %s" % (_arguments[-i], repr(_defaults[-i])) |
| 267 | 172 |
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173 arguments_defaults = ', '.join(_arguments) |
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174 |
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175 code = compile('def %(name)s (self,%(arguments_defaults)s): return self._callback(%(arguments_callback)s)' % |
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176 {'name': name, 'arguments_defaults': arguments_defaults, 'arguments_callback': arguments_callback}, '<DBus bridge>', 'exec') |
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177 exec (code) # FIXME: to the same thing in a cleaner way, without compile/exec |
| 267 | 178 method = locals()[name] |
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179 async_callbacks = ('callback', 'errback') if async else None |
| 267 | 180 setattr(DbusObject, name, dbus.service.method( |
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181 const_INT_PREFIX + int_suffix, in_signature=in_sign, out_signature=out_sign, |
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182 async_callbacks=async_callbacks)(method)) |
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183 function = getattr(self, name) |
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184 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface] |
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185 func_table[function.__name__] = function # Needed for introspection |
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186 |
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187 def addSignal(self, name, int_suffix, signature, doc={}): |
| 267 | 188 """Dynamically add a signal to Dbus Bridge""" |
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189 attributes = ', '.join(self.__attributes(signature)) |
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190 #TODO: use doc parameter to name attributes |
| 267 | 191 |
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192 #code = compile ('def '+name+' (self,'+attributes+'): debug ("'+name+' signal")', '<DBus bridge>','exec') #XXX: the debug is too annoying with xmllog |
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193 code = compile('def ' + name + ' (self,' + attributes + '): pass', '<DBus bridge>', 'exec') |
| 267 | 194 exec (code) |
| 195 signal = locals()[name] | |
| 196 setattr(DbusObject, name, dbus.service.signal( | |
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197 const_INT_PREFIX + int_suffix, signature=signature)(signal)) |
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198 function = getattr(self, name) |
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199 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface] |
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200 func_table[function.__name__] = function # Needed for introspection |
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201 |
| 267 | 202 |
| 203 class DBusBridge(Bridge): | |
| 204 def __init__(self): | |
| 205 dbus.mainloop.glib.DBusGMainLoop(set_as_default=True) | |
| 206 Bridge.__init__(self) | |
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207 info("Init DBus...") |
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208 try: |
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209 self.session_bus = dbus.SessionBus() |
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210 except dbus.DBusException as e: |
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211 if e._dbus_error_name == 'org.freedesktop.DBus.Error.NotSupported': |
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212 print u"D-Bus is not launched, please see README to see instructions on how to launch it" |
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213 raise BridgeInitError |
| 267 | 214 self.dbus_name = dbus.service.BusName(const_INT_PREFIX, self.session_bus) |
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215 self.dbus_bridge = DbusObject(self.session_bus, const_OBJ_PATH) |
| 267 | 216 |
| 217 ##DIRECT_CALLS## | |
| 218 def register(self, name, callback): | |
| 219 debug("registering DBus bridge method [%s]", name) | |
| 220 self.dbus_bridge.register(name, callback) | |
| 221 | |
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222 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}): |
| 267 | 223 """Dynamically add a method to Dbus Bridge""" |
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224 #FIXME: doc parameter is kept only temporary, the time to remove it from calls |
| 267 | 225 print ("Adding method [%s] to DBus bridge" % name) |
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226 self.dbus_bridge.addMethod(name, int_suffix, in_sign, out_sign, method, async) |
| 267 | 227 self.register(name, method) |
| 228 | |
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229 def addSignal(self, name, int_suffix, signature, doc={}): |
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230 self.dbus_bridge.addSignal(name, int_suffix, signature, doc) |
| 267 | 231 setattr(DBusBridge, name, getattr(self.dbus_bridge, name)) |