Mercurial > libervia-backend
annotate src/bridge/bridge_constructor/dbus_core_template.py @ 495:a726b234d3bf
primitivus: moved constants in a separate file
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Mon, 03 Sep 2012 23:43:15 +0200 |
| parents | 2a072735e459 |
| children | ca13633d3b6b |
| rev | line source |
|---|---|
| 267 | 1 #!/usr/bin/python |
| 2 #-*- coding: utf-8 -*- | |
| 3 | |
| 4 """ | |
| 5 SAT: a jabber client | |
| 459 | 6 Copyright (C) 2009, 2010, 2011, 2012 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 | |
| 23 from bridge import Bridge | |
| 24 import dbus | |
| 25 import dbus.service | |
| 26 import dbus.mainloop.glib | |
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27 import inspect |
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28 from logging import debug, info, error |
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29 from twisted.internet.defer import Deferred |
| 267 | 30 |
| 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 class ParseError(Exception): |
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38 pass |
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39 |
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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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42 |
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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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45 |
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46 class AsyncNotDeferred(dbus.DBusException): |
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47 _dbus_error_name = const_ERROR_PREFIX + ".AsyncNotDeferred" |
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48 |
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49 class DeferredNotAsync(dbus.DBusException): |
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50 _dbus_error_name = const_ERROR_PREFIX + ".DeferredNotAsync" |
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51 |
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52 class GenericException(dbus.DBusException): |
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53 def __init__(self, twisted_error): |
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54 super(GenericException,self).__init__() |
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55 mess = twisted_error.getErrorMessage() |
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56 self._dbus_error_name = const_ERROR_PREFIX+"."+ (mess or str(twisted_error.__class__)) |
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57 |
| 267 | 58 class DbusObject(dbus.service.Object): |
| 59 | |
| 60 def __init__(self, bus, path): | |
| 61 dbus.service.Object.__init__(self, bus, path) | |
| 62 debug("Init DbusObject...") | |
| 63 self.cb={} | |
| 64 | |
| 65 def register(self, name, cb): | |
| 66 self.cb[name]=cb | |
| 67 | |
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68 def _callback(self, name, *args, **kwargs): |
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69 """call the callback if it exists, raise an exception else |
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70 if the callback return a deferred, use async methods""" |
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71 if not name in self.cb: |
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72 raise MethodNotRegistered |
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73 |
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74 if "callback" in kwargs: |
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75 #we must have errback too |
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76 if not "errback" in kwargs: |
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77 error("errback is missing in method call [%s]" % name) |
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78 raise InternalError |
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79 callback = kwargs.pop("callback") |
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80 errback = kwargs.pop("errback") |
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81 async = True |
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82 else: |
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83 async = False |
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84 result = self.cb[name](*args, **kwargs) |
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85 if async: |
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86 if not isinstance(result, Deferred): |
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87 error("Asynchronous method [%s] does not return a Deferred." % name) |
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88 raise AsyncNotDeferred |
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89 result.addCallback(lambda result: callback() if result==None else callback(result)) |
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90 result.addErrback(lambda err:errback(GenericException(err))) |
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91 else: |
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92 if isinstance(result, Deferred): |
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93 error("Synchronous method [%s] return a Deferred." % name) |
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94 raise DeferredNotAsync |
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95 return result |
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96 |
| 267 | 97 ### signals ### |
| 98 | |
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99 @dbus.service.signal(const_INT_PREFIX+const_PLUGIN_SUFFIX, |
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100 signature='') |
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101 def dummySignal(self): |
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102 #FIXME: workaround for addSignal (doesn't work if one method doensn't |
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103 # already exist for plugins), probably missing some initialisation, need |
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104 # further investigations |
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105 pass |
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106 |
| 267 | 107 ##SIGNALS_PART## |
| 108 | |
| 109 ### methods ### | |
| 110 | |
| 111 ##METHODS_PART## | |
| 112 | |
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113 def __attributes(self, in_sign): |
| 267 | 114 """Return arguments to user given a in_sign |
| 115 @param in_sign: in_sign in the short form (using s,a,i,b etc) | |
| 116 @return: list of arguments that correspond to a in_sign (e.g.: "sss" return "arg1, arg2, arg3")""" | |
| 117 i=0 | |
| 118 idx=0 | |
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119 attr=[] |
| 267 | 120 while i<len(in_sign): |
| 121 if in_sign[i] not in ['b','y','n','i','x','q','u','t','d','s','a']: | |
| 122 raise ParseError("Unmanaged attribute type [%c]" % in_sign[i]) | |
| 123 | |
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124 attr.append("arg_%i" % idx) |
| 267 | 125 idx+=1 |
| 126 | |
| 127 if in_sign[i] == 'a': | |
| 128 i+=1 | |
| 129 if in_sign[i]!='{' and in_sign[i]!='(': #FIXME: must manage tuples out of arrays | |
| 130 i+=1 | |
| 131 continue #we have a simple type for the array | |
| 132 opening_car = in_sign[i] | |
| 133 assert(opening_car in ['{','(']) | |
| 134 closing_car = '}' if opening_car == '{' else ')' | |
| 135 opening_count = 1 | |
| 136 while (True): #we have a dict or a list of tuples | |
| 137 i+=1 | |
| 138 if i>=len(in_sign): | |
| 139 raise ParseError("missing }") | |
| 140 if in_sign[i] == opening_car: | |
| 141 opening_count+=1 | |
| 142 if in_sign[i] == closing_car: | |
| 143 opening_count-=1 | |
| 144 if opening_count == 0: | |
| 145 break | |
| 146 i+=1 | |
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147 return attr |
| 267 | 148 |
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149 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False): |
| 267 | 150 """Dynamically add a method to Dbus Bridge""" |
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151 inspect_args = inspect.getargspec(method) |
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152 |
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153 _arguments = inspect_args.args |
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154 _defaults = list(inspect_args.defaults or []) |
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155 |
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156 if inspect.ismethod(method): |
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157 #if we have a method, we don't want the first argument (usually 'self') |
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158 del(_arguments[0]) |
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159 |
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160 #first arguments are for the _callback method |
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161 arguments_callback = ', '.join([repr(name)] + ((_arguments + ['callback=callback','errback=errback']) if async else _arguments)) |
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162 |
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163 if async: |
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164 _arguments.extend(['callback','errback']) |
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165 _defaults.extend([None, None]) |
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166 |
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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 | 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 | 177 method = locals()[name] |
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178 async_callbacks = ('callback', 'errback') if async else None |
| 267 | 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 |
| 267 | 185 |
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186 def addSignal(self, name, int_suffix, signature, doc={}): |
| 267 | 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 | 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 | 193 exec (code) |
| 194 signal = locals()[name] | |
| 195 setattr(DbusObject, name, dbus.service.signal( | |
| 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 |
| 267 | 200 |
| 201 class DBusBridge(Bridge): | |
| 202 def __init__(self): | |
| 203 dbus.mainloop.glib.DBusGMainLoop(set_as_default=True) | |
| 204 Bridge.__init__(self) | |
| 205 info ("Init DBus...") | |
| 206 self.session_bus = dbus.SessionBus() | |
| 207 self.dbus_name = dbus.service.BusName(const_INT_PREFIX, self.session_bus) | |
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208 self.dbus_bridge = DbusObject(self.session_bus, const_OBJ_PATH) |
| 267 | 209 |
| 210 ##DIRECT_CALLS## | |
| 211 | |
| 212 def register(self, name, callback): | |
| 213 debug("registering DBus bridge method [%s]", name) | |
| 214 self.dbus_bridge.register(name, callback) | |
| 215 | |
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216 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}): |
| 267 | 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 | 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 | 221 self.register(name, method) |
| 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 | 225 setattr(DBusBridge, name, getattr(self.dbus_bridge, name)) |
| 226 |