Mercurial > libervia-backend
annotate src/bridge/bridge_constructor/dbus_core_template.py @ 1661:96ee986dab3c
plugin XEP-0277: added a trigger on data2entry and comments management
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Tue, 24 Nov 2015 16:21:18 +0100 |
| parents | 069ad98b360d |
| children | d17772b0fe22 |
| rev | line source |
|---|---|
| 267 | 1 #!/usr/bin/python |
| 2 #-*- coding: utf-8 -*- | |
| 3 | |
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4 # SAT: a jabber client |
| 1396 | 5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015 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 |
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20 from sat.core.i18n import _ |
| 267 | 21 from bridge import Bridge |
| 22 import dbus | |
| 23 import dbus.service | |
| 24 import dbus.mainloop.glib | |
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25 import inspect |
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26 from sat.core.log import getLogger |
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27 log = getLogger(__name__) |
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28 from twisted.internet.defer import Deferred |
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29 from sat.core.exceptions import BridgeInitError |
| 267 | 30 |
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31 const_INT_PREFIX = "org.goffi.SAT" # Interface prefix |
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32 const_ERROR_PREFIX = const_INT_PREFIX + ".error" |
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33 const_OBJ_PATH = '/org/goffi/SAT/bridge' |
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34 const_CORE_SUFFIX = ".core" |
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35 const_PLUGIN_SUFFIX = ".plugin" |
| 267 | 36 |
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37 |
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38 class ParseError(Exception): |
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39 pass |
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40 |
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41 |
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42 class MethodNotRegistered(dbus.DBusException): |
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43 _dbus_error_name = const_ERROR_PREFIX + ".MethodNotRegistered" |
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44 |
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45 |
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46 class InternalError(dbus.DBusException): |
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47 _dbus_error_name = const_ERROR_PREFIX + ".InternalError" |
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48 |
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49 |
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50 class AsyncNotDeferred(dbus.DBusException): |
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51 _dbus_error_name = const_ERROR_PREFIX + ".AsyncNotDeferred" |
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52 |
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53 |
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54 class DeferredNotAsync(dbus.DBusException): |
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55 _dbus_error_name = const_ERROR_PREFIX + ".DeferredNotAsync" |
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56 |
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57 |
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58 class GenericException(dbus.DBusException): |
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59 def __init__(self, twisted_error): |
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60 """ |
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61 |
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62 @param twisted_error (Failure): instance of twisted Failure |
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63 @return: DBusException |
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64 """ |
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65 super(GenericException, self).__init__() |
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66 try: |
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67 # twisted_error.value is a class |
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68 class_ = twisted_error.value().__class__ |
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69 except TypeError: |
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70 # twisted_error.value is an instance |
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71 class_ = twisted_error.value.__class__ |
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72 message = twisted_error.getErrorMessage() |
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73 try: |
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74 self.args = (message, twisted_error.value.condition) |
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75 except AttributeError: |
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76 self.args = (message,) |
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77 self._dbus_error_name = '.'.join([const_ERROR_PREFIX, class_.__module__, class_.__name__]) |
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78 |
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79 |
| 267 | 80 class DbusObject(dbus.service.Object): |
| 81 | |
| 82 def __init__(self, bus, path): | |
| 83 dbus.service.Object.__init__(self, bus, path) | |
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84 log.debug("Init DbusObject...") |
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85 self.cb = {} |
| 267 | 86 |
| 87 def register(self, name, cb): | |
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88 self.cb[name] = cb |
| 267 | 89 |
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90 def _callback(self, name, *args, **kwargs): |
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91 """call the callback if it exists, raise an exception else |
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92 if the callback return a deferred, use async methods""" |
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93 if not name in self.cb: |
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94 raise MethodNotRegistered |
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95 |
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96 if "callback" in kwargs: |
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97 #we must have errback too |
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98 if not "errback" in kwargs: |
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99 log.error("errback is missing in method call [%s]" % name) |
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100 raise InternalError |
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101 callback = kwargs.pop("callback") |
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102 errback = kwargs.pop("errback") |
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103 async = True |
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104 else: |
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105 async = False |
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106 result = self.cb[name](*args, **kwargs) |
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107 if async: |
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108 if not isinstance(result, Deferred): |
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109 log.error("Asynchronous method [%s] does not return a Deferred." % name) |
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110 raise AsyncNotDeferred |
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111 result.addCallback(lambda result: callback() if result is None else callback(result)) |
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112 result.addErrback(lambda err: errback(GenericException(err))) |
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113 else: |
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114 if isinstance(result, Deferred): |
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115 log.error("Synchronous method [%s] return a Deferred." % name) |
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116 raise DeferredNotAsync |
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117 return result |
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118 ### signals ### |
| 267 | 119 |
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120 @dbus.service.signal(const_INT_PREFIX + const_PLUGIN_SUFFIX, |
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121 signature='') |
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122 def dummySignal(self): |
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123 #FIXME: workaround for addSignal (doesn't work if one method doensn't |
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124 # already exist for plugins), probably missing some initialisation, need |
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125 # further investigations |
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126 pass |
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127 |
| 267 | 128 ##SIGNALS_PART## |
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129 ### methods ### |
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130 |
| 267 | 131 ##METHODS_PART## |
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132 def __attributes(self, in_sign): |
| 267 | 133 """Return arguments to user given a in_sign |
| 134 @param in_sign: in_sign in the short form (using s,a,i,b etc) | |
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135 @return: list of arguments that correspond to a in_sign (e.g.: "sss" return "arg1, arg2, arg3")""" |
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136 i = 0 |
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137 idx = 0 |
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138 attr = [] |
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139 while i < len(in_sign): |
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140 if in_sign[i] not in ['b', 'y', 'n', 'i', 'x', 'q', 'u', 't', 'd', 's', 'a']: |
| 267 | 141 raise ParseError("Unmanaged attribute type [%c]" % in_sign[i]) |
| 142 | |
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143 attr.append("arg_%i" % idx) |
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144 idx += 1 |
| 267 | 145 |
| 146 if in_sign[i] == 'a': | |
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147 i += 1 |
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148 if in_sign[i] != '{' and in_sign[i] != '(': # FIXME: must manage tuples out of arrays |
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149 i += 1 |
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150 continue # we have a simple type for the array |
| 267 | 151 opening_car = in_sign[i] |
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152 assert(opening_car in ['{', '(']) |
| 267 | 153 closing_car = '}' if opening_car == '{' else ')' |
| 154 opening_count = 1 | |
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155 while (True): # we have a dict or a list of tuples |
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156 i += 1 |
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157 if i >= len(in_sign): |
| 267 | 158 raise ParseError("missing }") |
| 159 if in_sign[i] == opening_car: | |
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160 opening_count += 1 |
| 267 | 161 if in_sign[i] == closing_car: |
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162 opening_count -= 1 |
| 267 | 163 if opening_count == 0: |
| 164 break | |
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165 i += 1 |
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166 return attr |
| 267 | 167 |
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168 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False): |
| 267 | 169 """Dynamically add a method to Dbus Bridge""" |
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170 inspect_args = inspect.getargspec(method) |
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171 |
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172 _arguments = inspect_args.args |
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173 _defaults = list(inspect_args.defaults or []) |
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174 |
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175 if inspect.ismethod(method): |
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176 #if we have a method, we don't want the first argument (usually 'self') |
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177 del(_arguments[0]) |
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178 |
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179 #first arguments are for the _callback method |
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180 arguments_callback = ', '.join([repr(name)] + ((_arguments + ['callback=callback', 'errback=errback']) if async else _arguments)) |
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181 |
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182 if async: |
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183 _arguments.extend(['callback', 'errback']) |
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184 _defaults.extend([None, None]) |
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185 |
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186 #now we create a second list with default values |
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187 for i in range(1, len(_defaults) + 1): |
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188 _arguments[-i] = "%s = %s" % (_arguments[-i], repr(_defaults[-i])) |
| 267 | 189 |
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190 arguments_defaults = ', '.join(_arguments) |
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191 |
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192 code = compile('def %(name)s (self,%(arguments_defaults)s): return self._callback(%(arguments_callback)s)' % |
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193 {'name': name, 'arguments_defaults': arguments_defaults, 'arguments_callback': arguments_callback}, '<DBus bridge>', 'exec') |
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194 exec (code) # FIXME: to the same thing in a cleaner way, without compile/exec |
| 267 | 195 method = locals()[name] |
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196 async_callbacks = ('callback', 'errback') if async else None |
| 267 | 197 setattr(DbusObject, name, dbus.service.method( |
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198 const_INT_PREFIX + int_suffix, in_signature=in_sign, out_signature=out_sign, |
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199 async_callbacks=async_callbacks)(method)) |
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200 function = getattr(self, name) |
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201 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface] |
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202 func_table[function.__name__] = function # Needed for introspection |
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203 |
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204 def addSignal(self, name, int_suffix, signature, doc={}): |
| 267 | 205 """Dynamically add a signal to Dbus Bridge""" |
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206 attributes = ', '.join(self.__attributes(signature)) |
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207 #TODO: use doc parameter to name attributes |
| 267 | 208 |
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209 #code = compile ('def '+name+' (self,'+attributes+'): log.debug ("'+name+' signal")', '<DBus bridge>','exec') #XXX: the log.debug is too annoying with xmllog |
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210 code = compile('def ' + name + ' (self,' + attributes + '): pass', '<DBus bridge>', 'exec') |
| 267 | 211 exec (code) |
| 212 signal = locals()[name] | |
| 213 setattr(DbusObject, name, dbus.service.signal( | |
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214 const_INT_PREFIX + int_suffix, signature=signature)(signal)) |
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215 function = getattr(self, name) |
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216 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface] |
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217 func_table[function.__name__] = function # Needed for introspection |
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218 |
| 267 | 219 |
| 220 class DBusBridge(Bridge): | |
| 221 def __init__(self): | |
| 222 dbus.mainloop.glib.DBusGMainLoop(set_as_default=True) | |
| 223 Bridge.__init__(self) | |
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224 log.info("Init DBus...") |
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225 try: |
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226 self.session_bus = dbus.SessionBus() |
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227 except dbus.DBusException as e: |
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228 if e._dbus_error_name == 'org.freedesktop.DBus.Error.NotSupported': |
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229 log.error(_(u"D-Bus is not launched, please see README to see instructions on how to launch it")) |
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230 raise BridgeInitError |
| 267 | 231 self.dbus_name = dbus.service.BusName(const_INT_PREFIX, self.session_bus) |
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232 self.dbus_bridge = DbusObject(self.session_bus, const_OBJ_PATH) |
| 267 | 233 |
| 234 ##DIRECT_CALLS## | |
| 235 def register(self, name, callback): | |
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236 log.debug("registering DBus bridge method [%s]" % name) |
| 267 | 237 self.dbus_bridge.register(name, callback) |
| 238 | |
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239 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}): |
| 267 | 240 """Dynamically add a method to Dbus Bridge""" |
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241 #FIXME: doc parameter is kept only temporary, the time to remove it from calls |
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242 log.debug("Adding method [%s] to DBus bridge" % name) |
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243 self.dbus_bridge.addMethod(name, int_suffix, in_sign, out_sign, method, async) |
| 267 | 244 self.register(name, method) |
| 245 | |
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246 def addSignal(self, name, int_suffix, signature, doc={}): |
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247 self.dbus_bridge.addSignal(name, int_suffix, signature, doc) |
| 267 | 248 setattr(DBusBridge, name, getattr(self.dbus_bridge, name)) |