Mercurial > libervia-backend
annotate src/bridge/bridge_constructor/dbus_core_template.py @ 595:1f160467f5de
Fix pep8 support in src/bridge.
| author | Emmanuel Gil Peyrot <linkmauve@linkmauve.fr> |
|---|---|
| date | Fri, 18 Jan 2013 17:55:35 +0100 |
| parents | 952322b1d490 |
| children | 84a6e83157c2 |
| rev | line source |
|---|---|
| 267 | 1 #!/usr/bin/python |
| 2 #-*- coding: utf-8 -*- | |
| 3 | |
| 4 """ | |
| 5 SAT: a jabber client | |
| 572 | 6 Copyright (C) 2009, 2010, 2011, 2012, 2013 Jérôme Poisson (goffi@goffi.org) |
| 267 | 7 |
| 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 |
| 267 | 10 the Free Software Foundation, either version 3 of the License, or |
| 11 (at your option) any later version. | |
| 12 | |
| 13 This program is distributed in the hope that it will be useful, | |
| 14 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
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16 GNU Affero General Public License for more details. |
| 267 | 17 |
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18 You should have received a copy of the GNU Affero General Public License |
| 267 | 19 along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 """ | |
| 21 | |
| 22 from bridge import Bridge | |
| 23 import dbus | |
| 24 import dbus.service | |
| 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 |
| 267 | 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" |
| 267 | 35 |
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36 |
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37 class ParseError(Exception): |
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38 pass |
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39 |
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40 |
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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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43 |
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44 |
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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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47 |
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48 |
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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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51 |
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52 |
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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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55 |
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56 |
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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 |
| 267 | 64 class DbusObject(dbus.service.Object): |
| 65 | |
| 66 def __init__(self, bus, path): | |
| 67 dbus.service.Object.__init__(self, bus, path) | |
| 68 debug("Init DbusObject...") | |
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69 self.cb = {} |
| 267 | 70 |
| 71 def register(self, name, cb): | |
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72 self.cb[name] = cb |
| 267 | 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 ### |
| 267 | 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 |
| 267 | 112 ##SIGNALS_PART## |
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113 ### methods ### |
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114 |
| 267 | 115 ##METHODS_PART## |
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116 def __attributes(self, in_sign): |
| 267 | 117 """Return arguments to user given a in_sign |
| 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']: |
| 267 | 125 raise ParseError("Unmanaged attribute type [%c]" % in_sign[i]) |
| 126 | |
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127 attr.append("arg_%i" % idx) |
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128 idx += 1 |
| 267 | 129 |
| 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 |
| 267 | 135 opening_car = in_sign[i] |
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136 assert(opening_car in ['{', '(']) |
| 267 | 137 closing_car = '}' if opening_car == '{' else ')' |
| 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): |
| 267 | 142 raise ParseError("missing }") |
| 143 if in_sign[i] == opening_car: | |
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144 opening_count += 1 |
| 267 | 145 if in_sign[i] == closing_car: |
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146 opening_count -= 1 |
| 267 | 147 if opening_count == 0: |
| 148 break | |
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149 i += 1 |
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150 return attr |
| 267 | 151 |
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152 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False): |
| 267 | 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 |
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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 | 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 | 179 method = locals()[name] |
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180 async_callbacks = ('callback', 'errback') if async else None |
| 267 | 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 |
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188 def addSignal(self, name, int_suffix, signature, doc={}): |
| 267 | 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 | 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 | 195 exec (code) |
| 196 signal = locals()[name] | |
| 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 | 203 |
| 204 class DBusBridge(Bridge): | |
| 205 def __init__(self): | |
| 206 dbus.mainloop.glib.DBusGMainLoop(set_as_default=True) | |
| 207 Bridge.__init__(self) | |
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208 info("Init DBus...") |
| 267 | 209 self.session_bus = dbus.SessionBus() |
| 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) |
| 267 | 212 |
| 213 ##DIRECT_CALLS## | |
| 214 def register(self, name, callback): | |
| 215 debug("registering DBus bridge method [%s]", name) | |
| 216 self.dbus_bridge.register(name, callback) | |
| 217 | |
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218 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}): |
| 267 | 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 | 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 | 223 self.register(name, method) |
| 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 | 227 setattr(DBusBridge, name, getattr(self.dbus_bridge, name)) |