Added inheritance class SessionHandler (Plugin is the base-class

lodel/plugin/plugins.py

@@ -41,8 +41,8 @@ DEFAULT_PLUGINS_PATH_LIST = ['./plugins']
 MANDATORY_VARNAMES = [PLUGIN_NAME_VARNAME, LOADER_FILENAME_VARNAME, 
     PLUGIN_VERSION_VARNAME]
 
-PLUGIN_DEFAULT_TYPE = 'default'
-PLUGINS_TYPES = [PLUGIN_DEFAULT_TYPE, 'datasource', 'session_handler', 'ui']
+EXTENSIONS = 'default'
+PLUGINS_TYPES = [EXTENSIONS, 'datasource', 'session_handler', 'ui']
 
 
 ##@brief Describe and handle version numbers
@@ -248,7 +248,7 @@ init file. Malformed plugin"
         try:
             self.__type = getattr(self.module, PLUGIN_TYPE_VARNAME)
         except AttributeError:
-            self.__type = PLUGIN_DEFAULT_TYPE
+            self.__type = EXTENSIONS
         self.__type = str(self.__type).lower()
         if self.__type not in PLUGINS_TYPES:
             raise PluginError("Unknown plugin type '%s'" % self.__type)
@@ -296,7 +296,7 @@ name differ from the one found in plugin's init file"
         filename = os.path.join(self.path, filename)
         loader = SourceFileLoader(module_name, filename)
         return loader.load_module()
-    
+   
     ##@brief Check dependencies of plugin
     #@return A list of plugin name to be loaded before
     def check_deps(self):
@@ -419,7 +419,8 @@ name differ from the one found in plugin's init file"
         from lodel.plugin.hooks import LodelHook
         LodelHook.call_hook(
             "lodel2_plugins_loaded", cls, cls._plugin_instances)
-    
+   
+
     ##@return a copy of __confspecs attr
     @property
     def confspecs(self):
@@ -785,3 +786,18 @@ with %s" % (custom_method._method_name, custom_method))
 # - an _activate() method that returns True if the plugin can be activated (
 # optionnal)
 #
+
+
+
+
+
+class SessionHandler(Plugin):
+    __instance = None
+
+    def __new__(cls):
+        if cls.__instance == None:
+            cls.instance == object.__new__(cls)
+        return cls.__instance
+        
+    def __init__(self, plugin_name):
+        super(Plugin, self).__init__(plugin_name)

lodel/settings/validator.py

@@ -237,14 +237,48 @@ def emfield_val(value):
         if value[1].lower() not in ccls.fieldnames(True):
             msg = "Following field not found in class %s : %s"
             raise SettingsValidationError(msg % value)
-            
-            
     return value
         
+def plugin_val(value):
+    #Late validation hook
+    @LodelHook('lodel2_dyncode_bootstraped')
+    def plugin_check(hookname, caller, payload):
+        from lodel import plugin
+        for inst in plugin._plugin_instances:
+            if (!isinstance(value, inst)):
+                msg = "Following plugin types do not exists in the loader: %s"
+                raise SettingsValidationError(msg % value)
+    return value
+
+def plugins_val(value):
+    spl = value.split('.')
+    if len(spl) < 1:
+        msg = "Expected a value in the form PLUGIN.NAME or PLUGIN.VERSION but got : %s"
+        raise SettingsValidationError(msg % value)
+    value = tuple(spl)
+    #Late validation hook
+    @LodelHook('lodel2_dyncode_bootstraped')
+    def plugin_check(hookname, caller, payload):
+        from lodel import plugin
+        pluginnames = { cls.__type.lower():cls for cls in dyncode.dynclasses}
+        if value[0].lower() not in pluginsnames:
+            msg = "Following plugin types do not exists in the loader: %s"
+            raise SettingsValidationError(msg % value[0])
+        ccls = classnames[value[0].lower()]
+        if value[1].lower() not in ccls.fieldnames(True):
+            msg = "Following field not found in class %s : %s"
+            raise SettingsValidationError(msg % value)
+    return value
+
 #
 #   Default validators registration
 #
 
+SettingValidator.register_validator(
+    'plugin',
+    plugin_val,
+    'plugin validator')
+
 SettingValidator.register_validator(
     'dummy',
     lambda value:value,