annotate src/bridge/bridge_constructor/dbus_core_template.py @ 597:cc09cc8c78fc

core: version update to development version
author Goffi <goffi@goffi.org>
date Wed, 20 Feb 2013 19:52:46 +0100
parents 1f160467f5de
children 84a6e83157c2
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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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6 Copyright (C) 2009, 2010, 2011, 2012, 2013 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 Affero 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 Affero 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 Affero 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 from bridge import Bridge
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23 import dbus
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24 import dbus.service
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25 import dbus.mainloop.glib
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26 import inspect
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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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36
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37 class ParseError(Exception):
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38 pass
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41 class MethodNotRegistered(dbus.DBusException):
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42 _dbus_error_name = const_ERROR_PREFIX + ".MethodNotRegistered"
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45 class InternalError(dbus.DBusException):
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46 _dbus_error_name = const_ERROR_PREFIX + ".InternalError"
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49 class AsyncNotDeferred(dbus.DBusException):
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50 _dbus_error_name = const_ERROR_PREFIX + ".AsyncNotDeferred"
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53 class DeferredNotAsync(dbus.DBusException):
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54 _dbus_error_name = const_ERROR_PREFIX + ".DeferredNotAsync"
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57 class GenericException(dbus.DBusException):
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58 def __init__(self, twisted_error):
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59 super(GenericException, self).__init__()
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60 mess = twisted_error.getErrorMessage()
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61 self._dbus_error_name = const_ERROR_PREFIX + "." + (mess or str(twisted_error.__class__))
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62
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63
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64 class DbusObject(dbus.service.Object):
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66 def __init__(self, bus, path):
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67 dbus.service.Object.__init__(self, bus, path)
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68 debug("Init DbusObject...")
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69 self.cb = {}
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70
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71 def register(self, name, cb):
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72 self.cb[name] = cb
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73
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74 def _callback(self, name, *args, **kwargs):
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75 """call the callback if it exists, raise an exception else
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76 if the callback return a deferred, use async methods"""
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77 if not name in self.cb:
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78 raise MethodNotRegistered
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79
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80 if "callback" in kwargs:
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81 #we must have errback too
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82 if not "errback" in kwargs:
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83 error("errback is missing in method call [%s]" % name)
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84 raise InternalError
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85 callback = kwargs.pop("callback")
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86 errback = kwargs.pop("errback")
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87 async = True
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88 else:
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89 async = False
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90 result = self.cb[name](*args, **kwargs)
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91 if async:
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92 if not isinstance(result, Deferred):
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93 error("Asynchronous method [%s] does not return a Deferred." % name)
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94 raise AsyncNotDeferred
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95 result.addCallback(lambda result: callback() if result is None else callback(result))
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96 result.addErrback(lambda err: errback(GenericException(err)))
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97 else:
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98 if isinstance(result, Deferred):
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99 error("Synchronous method [%s] return a Deferred." % name)
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100 raise DeferredNotAsync
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101 return result
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102 ### signals ###
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103
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104 @dbus.service.signal(const_INT_PREFIX + const_PLUGIN_SUFFIX,
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105 signature='')
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106 def dummySignal(self):
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107 #FIXME: workaround for addSignal (doesn't work if one method doensn't
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108 # already exist for plugins), probably missing some initialisation, need
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109 # further investigations
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110 pass
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111
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112 ##SIGNALS_PART##
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113 ### methods ###
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114
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115 ##METHODS_PART##
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116 def __attributes(self, in_sign):
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117 """Return arguments to user given a in_sign
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118 @param in_sign: in_sign in the short form (using s,a,i,b etc)
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119 @return: list of arguments that correspond to a in_sign (e.g.: "sss" return "arg1, arg2, arg3")"""
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120 i = 0
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121 idx = 0
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122 attr = []
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123 while i < len(in_sign):
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124 if in_sign[i] not in ['b', 'y', 'n', 'i', 'x', 'q', 'u', 't', 'd', 's', 'a']:
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125 raise ParseError("Unmanaged attribute type [%c]" % in_sign[i])
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126
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127 attr.append("arg_%i" % idx)
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128 idx += 1
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129
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130 if in_sign[i] == 'a':
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131 i += 1
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132 if in_sign[i] != '{' and in_sign[i] != '(': # FIXME: must manage tuples out of arrays
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133 i += 1
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134 continue # we have a simple type for the array
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135 opening_car = in_sign[i]
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136 assert(opening_car in ['{', '('])
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137 closing_car = '}' if opening_car == '{' else ')'
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138 opening_count = 1
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139 while (True): # we have a dict or a list of tuples
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140 i += 1
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141 if i >= len(in_sign):
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142 raise ParseError("missing }")
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143 if in_sign[i] == opening_car:
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144 opening_count += 1
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145 if in_sign[i] == closing_car:
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146 opening_count -= 1
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147 if opening_count == 0:
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148 break
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149 i += 1
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150 return attr
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151
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152 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False):
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153 """Dynamically add a method to Dbus Bridge"""
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154 inspect_args = inspect.getargspec(method)
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155
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156 _arguments = inspect_args.args
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157 _defaults = list(inspect_args.defaults or [])
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158
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159 if inspect.ismethod(method):
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160 #if we have a method, we don't want the first argument (usually 'self')
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161 del(_arguments[0])
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162
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163 #first arguments are for the _callback method
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164 arguments_callback = ', '.join([repr(name)] + ((_arguments + ['callback=callback', 'errback=errback']) if async else _arguments))
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165
299
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166 if async:
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167 _arguments.extend(['callback', 'errback'])
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168 _defaults.extend([None, None])
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169
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170 #now we create a second list with default values
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171 for i in range(1, len(_defaults) + 1):
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172 _arguments[-i] = "%s = %s" % (_arguments[-i], repr(_defaults[-i]))
267
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173
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174 arguments_defaults = ', '.join(_arguments)
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175
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176 code = compile('def %(name)s (self,%(arguments_defaults)s): return self._callback(%(arguments_callback)s)' %
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177 {'name': name, 'arguments_defaults': arguments_defaults, 'arguments_callback': arguments_callback}, '<DBus bridge>', 'exec')
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178 exec (code) # FIXME: to the same thing in a cleaner way, without compile/exec
267
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179 method = locals()[name]
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180 async_callbacks = ('callback', 'errback') if async else None
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181 setattr(DbusObject, name, dbus.service.method(
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182 const_INT_PREFIX + int_suffix, in_signature=in_sign, out_signature=out_sign,
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183 async_callbacks=async_callbacks)(method))
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184 function = getattr(self, name)
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185 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface]
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186 func_table[function.__name__] = function # Needed for introspection
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187
298
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188 def addSignal(self, name, int_suffix, signature, doc={}):
267
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189 """Dynamically add a signal to Dbus Bridge"""
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190 attributes = ', '.join(self.__attributes(signature))
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191 #TODO: use doc parameter to name attributes
267
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192
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193 #code = compile ('def '+name+' (self,'+attributes+'): debug ("'+name+' signal")', '<DBus bridge>','exec') #XXX: the debug is too annoying with xmllog
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194 code = compile('def ' + name + ' (self,' + attributes + '): pass', '<DBus bridge>', 'exec')
267
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195 exec (code)
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196 signal = locals()[name]
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197 setattr(DbusObject, name, dbus.service.signal(
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198 const_INT_PREFIX + int_suffix, signature=signature)(signal))
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199 function = getattr(self, name)
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200 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface]
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201 func_table[function.__name__] = function # Needed for introspection
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202
267
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203
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204 class DBusBridge(Bridge):
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205 def __init__(self):
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206 dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
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207 Bridge.__init__(self)
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208 info("Init DBus...")
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209 self.session_bus = dbus.SessionBus()
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210 self.dbus_name = dbus.service.BusName(const_INT_PREFIX, self.session_bus)
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211 self.dbus_bridge = DbusObject(self.session_bus, const_OBJ_PATH)
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212
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213 ##DIRECT_CALLS##
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214 def register(self, name, callback):
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215 debug("registering DBus bridge method [%s]", name)
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216 self.dbus_bridge.register(name, callback)
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217
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218 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}):
267
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219 """Dynamically add a method to Dbus Bridge"""
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220 #FIXME: doc parameter is kept only temporary, the time to remove it from calls
267
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221 print ("Adding method [%s] to DBus bridge" % name)
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222 self.dbus_bridge.addMethod(name, int_suffix, in_sign, out_sign, method, async)
267
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223 self.register(name, method)
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224
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225 def addSignal(self, name, int_suffix, signature, doc={}):
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226 self.dbus_bridge.addSignal(name, int_suffix, signature, doc)
267
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227 setattr(DBusBridge, name, getattr(self.dbus_bridge, name))