Mercurial > libervia-backend

annotate src/bridge/bridge_constructor/dbus_core_template.py @ 627:d207c2186519

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core, bridge, jp, quick_frontend: SàT stop more gracefully if bridge can't be initialised: - new BridgeInitError and BridgeExceptionNoService are in core.exceptions - D-Bus NotSupported is catched in bridge, and launch a BridgeInitError - BridgeInitError stop SàT core, jp, and quick_frontends with an explanation message. fix bug 27
author Goffi <goffi@goffi.org>
date Fri, 21 Jun 2013 02:00:37 +0200
parents 84a6e83157c2
children 1def5b7edf9f
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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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27 from sat.core.exceptions import BridgeInitError
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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"
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35
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36 class ParseError(Exception):
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37 pass
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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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44 class InternalError(dbus.DBusException):
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45 _dbus_error_name = const_ERROR_PREFIX + ".InternalError"
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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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52 class DeferredNotAsync(dbus.DBusException):
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53 _dbus_error_name = const_ERROR_PREFIX + ".DeferredNotAsync"
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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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62
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63 class DbusObject(dbus.service.Object):
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64
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65 def __init__(self, bus, path):
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66 dbus.service.Object.__init__(self, bus, path)
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67 debug("Init DbusObject...")
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68 self.cb = {}
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69
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70 def register(self, name, cb):
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71 self.cb[name] = cb
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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 ###
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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
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111 ##SIGNALS_PART##
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112 ### methods ###
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113
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114 ##METHODS_PART##
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115 def __attributes(self, in_sign):
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116 """Return arguments to user given a in_sign
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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']:
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124 raise ParseError("Unmanaged attribute type [%c]" % in_sign[i])
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125
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126 attr.append("arg_%i" % idx)
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127 idx += 1
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128
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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
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134 opening_car = in_sign[i]
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135 assert(opening_car in ['{', '('])
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136 closing_car = '}' if opening_car == '{' else ')'
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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
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141 raise ParseError("missing }")
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142 if in_sign[i] == opening_car:
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143 opening_count += 1
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144 if in_sign[i] == closing_car:
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145 opening_count -= 1
267
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146 if opening_count == 0:
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147 break
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148 i += 1
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149 return attr
267
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150
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151 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False):
267
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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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diff changeset
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])
299
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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))
587
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164
299
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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])
587
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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):
469
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diff changeset
171 _arguments[-i] = "%s = %s" % (_arguments[-i], repr(_defaults[-i]))
267
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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
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178 method = locals()[name]
299
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179 async_callbacks = ('callback', 'errback') if async else None
267
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180 setattr(DbusObject, name, dbus.service.method(
595
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181 const_INT_PREFIX + int_suffix, in_signature=in_sign, out_signature=out_sign,
299
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diff changeset
182 async_callbacks=async_callbacks)(method))
284
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diff changeset
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
298
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diff changeset
187 def addSignal(self, name, int_suffix, signature, doc={}):
267
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188 """Dynamically add a signal to Dbus Bridge"""
299
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diff changeset
189 attributes = ', '.join(self.__attributes(signature))
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190 #TODO: use doc parameter to name attributes
267
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191
337
4402ac630712 bridge: async callback managed in bridge_constructor + misc
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diff changeset
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
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194 exec (code)
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195 signal = locals()[name]
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196 setattr(DbusObject, name, dbus.service.signal(
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197 const_INT_PREFIX + int_suffix, signature=signature)(signal))
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diff changeset
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
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202
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203 class DBusBridge(Bridge):
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204 def __init__(self):
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205 dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
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206 Bridge.__init__(self)
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diff changeset
207 info("Init DBus...")
627
d207c2186519 core, bridge, jp, quick_frontend: SàT stop more gracefully if bridge can't be initialised:
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diff changeset
208 try:
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diff changeset
209 self.session_bus = dbus.SessionBus()
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diff changeset
210 except dbus.DBusException as e:
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diff changeset
211 if e._dbus_error_name == 'org.freedesktop.DBus.Error.NotSupported':
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diff changeset
212 print u"D-Bus is not launched, please see README to see instructions on how to launch it"
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diff changeset
213 raise BridgeInitError
267
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diff changeset
214 self.dbus_name = dbus.service.BusName(const_INT_PREFIX, self.session_bus)
359
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diff changeset
215 self.dbus_bridge = DbusObject(self.session_bus, const_OBJ_PATH)
267
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216
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diff changeset
217 ##DIRECT_CALLS##
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218 def register(self, name, callback):
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parents:
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219 debug("registering DBus bridge method [%s]", name)
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diff changeset
220 self.dbus_bridge.register(name, callback)
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221
299
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diff changeset
222 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}):
267
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223 """Dynamically add a method to Dbus Bridge"""
468
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diff changeset
224 #FIXME: doc parameter is kept only temporary, the time to remove it from calls
267
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diff changeset
225 print ("Adding method [%s] to DBus bridge" % name)
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diff changeset
226 self.dbus_bridge.addMethod(name, int_suffix, in_sign, out_sign, method, async)
267
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diff changeset
227 self.register(name, method)
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diff changeset
228
298
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diff changeset
229 def addSignal(self, name, int_suffix, signature, doc={}):
299
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diff changeset
230 self.dbus_bridge.addSignal(name, int_suffix, signature, doc)
267
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diff changeset
231 setattr(DBusBridge, name, getattr(self.dbus_bridge, name))