The Response object can now carry error details. Not sure about this though, it needs refinements

wsme/api.py

@@ -183,13 +183,18 @@ class Response(object):
     """
     Object to hold the "response" from a view function
     """
-    def __init__(self, obj, status_code=None):
+    def __init__(self, obj, status_code=None, error=None):
         #: Store the result object from the view
         self.obj = obj
 
         #: Store an optional status_code
         self.status_code = status_code
 
+        #: Return error details
+        #: Must be a dictionnary with the following keys: faultcode,
+        #: faultstring and an optional debuginfo
+        self.error = error
+
 
 def format_exception(excinfo, debug=False):
     """Extract informations that can be sent to the client."""

wsmeext/cornice.py

@@ -23,6 +23,7 @@ import wsme
 from wsme.rest import json as restjson
 from wsme.rest import xml as restxml
 import wsme.runtime
+import wsme.api
 import functools
 
 from wsme.rest.args import (
@@ -43,7 +44,13 @@ class WSMEJsonRenderer(object):
             else:
                 response.status_code = 500
             return restjson.encode_error(None, data)
-        return restjson.encode_result(data['result'], data['datatype'])
+        obj = data['result']
+        if isinstance(obj, wsme.api.Response):
+            response.status_code = obj.status_code
+            if obj.error:
+                return restjson.encode_error(None, obj.error)
+            obj = obj.obj
+        return restjson.encode_result(obj, data['datatype'])
 
 
 class WSMEXmlRenderer(object):