wip: redis, sqlalchemy, structured, etc

exceptions.py

@@ -0,0 +1,26 @@
+from graphql import GraphQLError
+
+
+class BaseHttpException(GraphQLError):
+    code = 500
+    message = "500 Server error"
+
+
+class InvalidToken(BaseHttpException):
+    code = 403
+    message = "403 Invalid Token"
+
+
+class ObjectNotExist(BaseHttpException):
+    code = 404
+    message = "404 Object Does Not Exist"
+
+
+class OperationNotAllowed(BaseHttpException):
+    code = 403
+    message = "403 Operation is not allowed"
+
+
+class InvalidPassword(BaseHttpException):
+    code = 401
+    message = "401 Invalid Password"