Mercurial > libervia-backend
annotate src/bridge/bridge_constructor/dbus_core_template.py @ 945:899dc9cd0f35
plugin XEP-0092: feature check before requesting version
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Fri, 28 Mar 2014 18:19:29 +0100 |
| parents | 1fe00f0c9a91 |
| children | 301b342c697a |
| rev | line source |
|---|---|
| 267 | 1 #!/usr/bin/python |
| 2 #-*- coding: utf-8 -*- | |
| 3 | |
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4 # SAT: a jabber client |
| 811 | 5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org) |
| 267 | 6 |
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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. |
| 267 | 11 |
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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. |
| 267 | 16 |
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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/>. |
| 267 | 19 |
| 20 from bridge import Bridge | |
| 21 import dbus | |
| 22 import dbus.service | |
| 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 |
| 267 | 28 |
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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" |
| 267 | 34 |
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35 |
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36 class ParseError(Exception): |
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37 pass |
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38 |
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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 |
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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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46 |
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47 |
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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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50 |
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51 |
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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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54 |
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55 |
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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 try: |
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60 error_name = str(twisted_error.value().__class__.__name__) |
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61 # twisted_error.value is a class |
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62 except TypeError: |
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63 # twisted_error.value is an instance |
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64 error_name = str(twisted_error.value.__class__.__name__) |
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65 self._dbus_error_name = const_ERROR_PREFIX + "." + error_name |
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66 |
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67 |
| 267 | 68 class DbusObject(dbus.service.Object): |
| 69 | |
| 70 def __init__(self, bus, path): | |
| 71 dbus.service.Object.__init__(self, bus, path) | |
| 72 debug("Init DbusObject...") | |
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73 self.cb = {} |
| 267 | 74 |
| 75 def register(self, name, cb): | |
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76 self.cb[name] = cb |
| 267 | 77 |
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78 def _callback(self, name, *args, **kwargs): |
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79 """call the callback if it exists, raise an exception else |
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80 if the callback return a deferred, use async methods""" |
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81 if not name in self.cb: |
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82 raise MethodNotRegistered |
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83 |
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84 if "callback" in kwargs: |
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85 #we must have errback too |
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86 if not "errback" in kwargs: |
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87 error("errback is missing in method call [%s]" % name) |
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88 raise InternalError |
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89 callback = kwargs.pop("callback") |
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90 errback = kwargs.pop("errback") |
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91 async = True |
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92 else: |
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93 async = False |
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94 result = self.cb[name](*args, **kwargs) |
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95 if async: |
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96 if not isinstance(result, Deferred): |
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97 error("Asynchronous method [%s] does not return a Deferred." % name) |
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98 raise AsyncNotDeferred |
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99 result.addCallback(lambda result: callback() if result is None else callback(result)) |
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100 result.addErrback(lambda err: errback(GenericException(err))) |
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101 else: |
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102 if isinstance(result, Deferred): |
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103 error("Synchronous method [%s] return a Deferred." % name) |
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104 raise DeferredNotAsync |
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105 return result |
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106 ### signals ### |
| 267 | 107 |
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108 @dbus.service.signal(const_INT_PREFIX + const_PLUGIN_SUFFIX, |
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109 signature='') |
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110 def dummySignal(self): |
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111 #FIXME: workaround for addSignal (doesn't work if one method doensn't |
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112 # already exist for plugins), probably missing some initialisation, need |
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113 # further investigations |
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114 pass |
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115 |
| 267 | 116 ##SIGNALS_PART## |
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117 ### methods ### |
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118 |
| 267 | 119 ##METHODS_PART## |
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120 def __attributes(self, in_sign): |
| 267 | 121 """Return arguments to user given a in_sign |
| 122 @param in_sign: in_sign in the short form (using s,a,i,b etc) | |
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123 @return: list of arguments that correspond to a in_sign (e.g.: "sss" return "arg1, arg2, arg3")""" |
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124 i = 0 |
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125 idx = 0 |
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126 attr = [] |
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127 while i < len(in_sign): |
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128 if in_sign[i] not in ['b', 'y', 'n', 'i', 'x', 'q', 'u', 't', 'd', 's', 'a']: |
| 267 | 129 raise ParseError("Unmanaged attribute type [%c]" % in_sign[i]) |
| 130 | |
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131 attr.append("arg_%i" % idx) |
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132 idx += 1 |
| 267 | 133 |
| 134 if in_sign[i] == 'a': | |
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135 i += 1 |
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136 if in_sign[i] != '{' and in_sign[i] != '(': # FIXME: must manage tuples out of arrays |
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137 i += 1 |
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138 continue # we have a simple type for the array |
| 267 | 139 opening_car = in_sign[i] |
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140 assert(opening_car in ['{', '(']) |
| 267 | 141 closing_car = '}' if opening_car == '{' else ')' |
| 142 opening_count = 1 | |
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143 while (True): # we have a dict or a list of tuples |
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144 i += 1 |
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145 if i >= len(in_sign): |
| 267 | 146 raise ParseError("missing }") |
| 147 if in_sign[i] == opening_car: | |
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148 opening_count += 1 |
| 267 | 149 if in_sign[i] == closing_car: |
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150 opening_count -= 1 |
| 267 | 151 if opening_count == 0: |
| 152 break | |
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153 i += 1 |
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154 return attr |
| 267 | 155 |
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156 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False): |
| 267 | 157 """Dynamically add a method to Dbus Bridge""" |
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158 inspect_args = inspect.getargspec(method) |
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159 |
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160 _arguments = inspect_args.args |
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161 _defaults = list(inspect_args.defaults or []) |
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162 |
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163 if inspect.ismethod(method): |
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164 #if we have a method, we don't want the first argument (usually 'self') |
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165 del(_arguments[0]) |
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166 |
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167 #first arguments are for the _callback method |
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168 arguments_callback = ', '.join([repr(name)] + ((_arguments + ['callback=callback', 'errback=errback']) if async else _arguments)) |
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169 |
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170 if async: |
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171 _arguments.extend(['callback', 'errback']) |
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172 _defaults.extend([None, None]) |
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173 |
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174 #now we create a second list with default values |
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175 for i in range(1, len(_defaults) + 1): |
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176 _arguments[-i] = "%s = %s" % (_arguments[-i], repr(_defaults[-i])) |
| 267 | 177 |
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178 arguments_defaults = ', '.join(_arguments) |
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179 |
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180 code = compile('def %(name)s (self,%(arguments_defaults)s): return self._callback(%(arguments_callback)s)' % |
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181 {'name': name, 'arguments_defaults': arguments_defaults, 'arguments_callback': arguments_callback}, '<DBus bridge>', 'exec') |
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182 exec (code) # FIXME: to the same thing in a cleaner way, without compile/exec |
| 267 | 183 method = locals()[name] |
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184 async_callbacks = ('callback', 'errback') if async else None |
| 267 | 185 setattr(DbusObject, name, dbus.service.method( |
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186 const_INT_PREFIX + int_suffix, in_signature=in_sign, out_signature=out_sign, |
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187 async_callbacks=async_callbacks)(method)) |
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188 function = getattr(self, name) |
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189 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface] |
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190 func_table[function.__name__] = function # Needed for introspection |
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191 |
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192 def addSignal(self, name, int_suffix, signature, doc={}): |
| 267 | 193 """Dynamically add a signal to Dbus Bridge""" |
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194 attributes = ', '.join(self.__attributes(signature)) |
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195 #TODO: use doc parameter to name attributes |
| 267 | 196 |
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197 #code = compile ('def '+name+' (self,'+attributes+'): debug ("'+name+' signal")', '<DBus bridge>','exec') #XXX: the debug is too annoying with xmllog |
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198 code = compile('def ' + name + ' (self,' + attributes + '): pass', '<DBus bridge>', 'exec') |
| 267 | 199 exec (code) |
| 200 signal = locals()[name] | |
| 201 setattr(DbusObject, name, dbus.service.signal( | |
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202 const_INT_PREFIX + int_suffix, signature=signature)(signal)) |
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203 function = getattr(self, name) |
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204 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface] |
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205 func_table[function.__name__] = function # Needed for introspection |
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206 |
| 267 | 207 |
| 208 class DBusBridge(Bridge): | |
| 209 def __init__(self): | |
| 210 dbus.mainloop.glib.DBusGMainLoop(set_as_default=True) | |
| 211 Bridge.__init__(self) | |
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212 info("Init DBus...") |
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213 try: |
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214 self.session_bus = dbus.SessionBus() |
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215 except dbus.DBusException as e: |
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216 if e._dbus_error_name == 'org.freedesktop.DBus.Error.NotSupported': |
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217 print u"D-Bus is not launched, please see README to see instructions on how to launch it" |
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218 raise BridgeInitError |
| 267 | 219 self.dbus_name = dbus.service.BusName(const_INT_PREFIX, self.session_bus) |
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220 self.dbus_bridge = DbusObject(self.session_bus, const_OBJ_PATH) |
| 267 | 221 |
| 222 ##DIRECT_CALLS## | |
| 223 def register(self, name, callback): | |
| 224 debug("registering DBus bridge method [%s]", name) | |
| 225 self.dbus_bridge.register(name, callback) | |
| 226 | |
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227 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}): |
| 267 | 228 """Dynamically add a method to Dbus Bridge""" |
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229 #FIXME: doc parameter is kept only temporary, the time to remove it from calls |
| 267 | 230 print ("Adding method [%s] to DBus bridge" % name) |
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231 self.dbus_bridge.addMethod(name, int_suffix, in_sign, out_sign, method, async) |
| 267 | 232 self.register(name, method) |
| 233 | |
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234 def addSignal(self, name, int_suffix, signature, doc={}): |
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235 self.dbus_bridge.addSignal(name, int_suffix, signature, doc) |
| 267 | 236 setattr(DBusBridge, name, getattr(self.dbus_bridge, name)) |