Mercurial > libervia-backend

annotate src/bridge/bridge_constructor/dbus_core_template.py @ 621:0e16288d6816

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pluging groupblog: comments handling: - comments are no more automaticly requested and sent as events - a new bridge method "getGroupBlogComments" allow to request them
author Goffi <goffi@goffi.org>
date Thu, 20 Jun 2013 12:14:43 +0200
parents 84a6e83157c2
children d207c2186519
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 # SAT: a jabber client
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013 Jérôme Poisson (goffi@goffi.org)
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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.
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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.
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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/>.
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19
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20 from bridge import Bridge
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21 import dbus
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22 import dbus.service
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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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28 const_INT_PREFIX = "org.goffi.SAT" # Interface prefix
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29 const_ERROR_PREFIX = const_INT_PREFIX + ".error"
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30 const_OBJ_PATH = '/org/goffi/SAT/bridge'
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31 const_CORE_SUFFIX = ".core"
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32 const_PLUGIN_SUFFIX = ".plugin"
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34
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35 class ParseError(Exception):
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36 pass
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39 class MethodNotRegistered(dbus.DBusException):
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40 _dbus_error_name = const_ERROR_PREFIX + ".MethodNotRegistered"
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43 class InternalError(dbus.DBusException):
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44 _dbus_error_name = const_ERROR_PREFIX + ".InternalError"
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47 class AsyncNotDeferred(dbus.DBusException):
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48 _dbus_error_name = const_ERROR_PREFIX + ".AsyncNotDeferred"
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51 class DeferredNotAsync(dbus.DBusException):
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52 _dbus_error_name = const_ERROR_PREFIX + ".DeferredNotAsync"
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55 class GenericException(dbus.DBusException):
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56 def __init__(self, twisted_error):
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57 super(GenericException, self).__init__()
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58 mess = twisted_error.getErrorMessage()
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59 self._dbus_error_name = const_ERROR_PREFIX + "." + (mess or str(twisted_error.__class__))
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61
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62 class DbusObject(dbus.service.Object):
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63
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64 def __init__(self, bus, path):
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65 dbus.service.Object.__init__(self, bus, path)
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66 debug("Init DbusObject...")
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67 self.cb = {}
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68
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69 def register(self, name, cb):
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70 self.cb[name] = cb
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71
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72 def _callback(self, name, *args, **kwargs):
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73 """call the callback if it exists, raise an exception else
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74 if the callback return a deferred, use async methods"""
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75 if not name in self.cb:
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76 raise MethodNotRegistered
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77
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78 if "callback" in kwargs:
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79 #we must have errback too
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80 if not "errback" in kwargs:
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81 error("errback is missing in method call [%s]" % name)
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82 raise InternalError
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83 callback = kwargs.pop("callback")
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84 errback = kwargs.pop("errback")
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85 async = True
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86 else:
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87 async = False
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88 result = self.cb[name](*args, **kwargs)
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89 if async:
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90 if not isinstance(result, Deferred):
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91 error("Asynchronous method [%s] does not return a Deferred." % name)
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92 raise AsyncNotDeferred
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93 result.addCallback(lambda result: callback() if result is None else callback(result))
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94 result.addErrback(lambda err: errback(GenericException(err)))
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95 else:
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96 if isinstance(result, Deferred):
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97 error("Synchronous method [%s] return a Deferred." % name)
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98 raise DeferredNotAsync
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99 return result
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100 ### signals ###
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101
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102 @dbus.service.signal(const_INT_PREFIX + const_PLUGIN_SUFFIX,
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103 signature='')
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104 def dummySignal(self):
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105 #FIXME: workaround for addSignal (doesn't work if one method doensn't
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106 # already exist for plugins), probably missing some initialisation, need
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107 # further investigations
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108 pass
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109
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110 ##SIGNALS_PART##
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111 ### methods ###
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112
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113 ##METHODS_PART##
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114 def __attributes(self, in_sign):
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115 """Return arguments to user given a in_sign
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116 @param in_sign: in_sign in the short form (using s,a,i,b etc)
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117 @return: list of arguments that correspond to a in_sign (e.g.: "sss" return "arg1, arg2, arg3")"""
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118 i = 0
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119 idx = 0
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120 attr = []
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121 while i < len(in_sign):
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122 if in_sign[i] not in ['b', 'y', 'n', 'i', 'x', 'q', 'u', 't', 'd', 's', 'a']:
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123 raise ParseError("Unmanaged attribute type [%c]" % in_sign[i])
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124
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125 attr.append("arg_%i" % idx)
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126 idx += 1
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127
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128 if in_sign[i] == 'a':
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129 i += 1
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130 if in_sign[i] != '{' and in_sign[i] != '(': # FIXME: must manage tuples out of arrays
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131 i += 1
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132 continue # we have a simple type for the array
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133 opening_car = in_sign[i]
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134 assert(opening_car in ['{', '('])
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135 closing_car = '}' if opening_car == '{' else ')'
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136 opening_count = 1
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137 while (True): # we have a dict or a list of tuples
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138 i += 1
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139 if i >= len(in_sign):
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140 raise ParseError("missing }")
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141 if in_sign[i] == opening_car:
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142 opening_count += 1
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143 if in_sign[i] == closing_car:
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144 opening_count -= 1
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145 if opening_count == 0:
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146 break
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147 i += 1
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148 return attr
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149
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150 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False):
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151 """Dynamically add a method to Dbus Bridge"""
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152 inspect_args = inspect.getargspec(method)
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153
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154 _arguments = inspect_args.args
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155 _defaults = list(inspect_args.defaults or [])
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156
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157 if inspect.ismethod(method):
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158 #if we have a method, we don't want the first argument (usually 'self')
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159 del(_arguments[0])
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160
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161 #first arguments are for the _callback method
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162 arguments_callback = ', '.join([repr(name)] + ((_arguments + ['callback=callback', 'errback=errback']) if async else _arguments))
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163
299
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164 if async:
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165 _arguments.extend(['callback', 'errback'])
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166 _defaults.extend([None, None])
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167
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168 #now we create a second list with default values
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169 for i in range(1, len(_defaults) + 1):
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170 _arguments[-i] = "%s = %s" % (_arguments[-i], repr(_defaults[-i]))
267
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171
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172 arguments_defaults = ', '.join(_arguments)
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173
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174 code = compile('def %(name)s (self,%(arguments_defaults)s): return self._callback(%(arguments_callback)s)' %
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175 {'name': name, 'arguments_defaults': arguments_defaults, 'arguments_callback': arguments_callback}, '<DBus bridge>', 'exec')
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176 exec (code) # FIXME: to the same thing in a cleaner way, without compile/exec
267
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177 method = locals()[name]
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178 async_callbacks = ('callback', 'errback') if async else None
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179 setattr(DbusObject, name, dbus.service.method(
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180 const_INT_PREFIX + int_suffix, in_signature=in_sign, out_signature=out_sign,
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181 async_callbacks=async_callbacks)(method))
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182 function = getattr(self, name)
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183 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface]
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184 func_table[function.__name__] = function # Needed for introspection
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185
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186 def addSignal(self, name, int_suffix, signature, doc={}):
267
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187 """Dynamically add a signal to Dbus Bridge"""
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188 attributes = ', '.join(self.__attributes(signature))
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189 #TODO: use doc parameter to name attributes
267
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190
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191 #code = compile ('def '+name+' (self,'+attributes+'): debug ("'+name+' signal")', '<DBus bridge>','exec') #XXX: the debug is too annoying with xmllog
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192 code = compile('def ' + name + ' (self,' + attributes + '): pass', '<DBus bridge>', 'exec')
267
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193 exec (code)
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194 signal = locals()[name]
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195 setattr(DbusObject, name, dbus.service.signal(
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196 const_INT_PREFIX + int_suffix, signature=signature)(signal))
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197 function = getattr(self, name)
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198 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface]
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199 func_table[function.__name__] = function # Needed for introspection
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200
267
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201
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202 class DBusBridge(Bridge):
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203 def __init__(self):
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204 dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
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205 Bridge.__init__(self)
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206 info("Init DBus...")
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207 self.session_bus = dbus.SessionBus()
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208 self.dbus_name = dbus.service.BusName(const_INT_PREFIX, self.session_bus)
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209 self.dbus_bridge = DbusObject(self.session_bus, const_OBJ_PATH)
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210
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211 ##DIRECT_CALLS##
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212 def register(self, name, callback):
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213 debug("registering DBus bridge method [%s]", name)
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214 self.dbus_bridge.register(name, callback)
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215
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216 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}):
267
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217 """Dynamically add a method to Dbus Bridge"""
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218 #FIXME: doc parameter is kept only temporary, the time to remove it from calls
267
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219 print ("Adding method [%s] to DBus bridge" % name)
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220 self.dbus_bridge.addMethod(name, int_suffix, in_sign, out_sign, method, async)
267
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221 self.register(name, method)
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222
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223 def addSignal(self, name, int_suffix, signature, doc={}):
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224 self.dbus_bridge.addSignal(name, int_suffix, signature, doc)
267
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225 setattr(DBusBridge, name, getattr(self.dbus_bridge, name))