Add data interface for globalmessages API

endpoints/api/globalmessages_models_interface.py

@@ -0,0 +1,39 @@
+from abc import ABCMeta, abstractmethod
+from collections import namedtuple
+
+from six import add_metaclass
+
+class GlobalMessage(
+  namedtuple('GlobalMessage', [
+    'uuid',
+    'content',
+    'severity',
+    'media_type_name',
+  ])):
+  
+  def to_dict(self):
+    return {
+      'uuid': self.uuid,
+      'content': self.content,
+      'severity': self.severity,
+      'media_type': self.media_type_name,
+    }
+
+
+
+@add_metaclass(ABCMeta)
+class GlobalMessageDataInterface(object):
+  
+  @abstractmethod
+  def get_all_messages(self):
+    pass
+  
+  @abstractmethod
+  def create_message(self):
+    pass
+  
+  @abstractmethod
+  def delete_message(self):
+    pass
+  
+