Merge "Handle error response for webob>=1.6.0"

novaclient/exceptions.py

@@ -294,9 +294,21 @@ def from_response(response, body, url, method=None):
         details = "n/a"
 
         if hasattr(body, 'keys'):
-            error = body[list(body)[0]]
+            # NOTE(mriedem): WebOb<1.6.0 will return a nested dict structure
-            message = error.get('message')
+            # where the error keys to the message/details/code. WebOb>=1.6.0
-            details = error.get('details')
+            # returns just a response body as a single dict, not nested,
+            # so we have to handle both cases (since we can't trust what we're
+            # given with content_type: application/json either way.
+            if 'message' in body:
+                # WebOb 1.6.0 case
+                message = body.get('message')
+                details = body.get('details')
+            else:
+                # WebOb<1.6.0 where we assume there is a single error message
+                # key to the body that has the message and details.
+                error = body[list(body)[0]]
+                message = error.get('message')
+                details = error.get('details')
 
         kwargs['message'] = message
         kwargs['details'] = details

novaclient/tests/unit/test_exceptions.py

@@ -0,0 +1,48 @@
+# Copyright 2016 IBM Corp.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from novaclient import exceptions
+from novaclient.tests.unit import utils as test_utils
+
+
+class ExceptionsTestCase(test_utils.TestCase):
+
+    def _test_from_response(self, body, expected_message):
+        data = {
+            'status_code': 404,
+            'headers': {
+                'content-type': 'application/json',
+                'x-openstack-request-id': (
+                    'req-d9df03b0-4150-4b53-8157-7560ccf39f75'),
+            }
+        }
+        response = test_utils.TestResponse(data)
+        fake_url = 'http://localhost:8774/v2.1/fake/flavors/test'
+        error = exceptions.from_response(response, body, fake_url, 'GET')
+        self.assertIsInstance(error, exceptions.NotFound)
+        self.assertEqual(expected_message, error.message)
+
+    def test_from_response_webob_pre_1_6_0(self):
+        # Tests error responses before webob 1.6.0 where the error details
+        # are nested in the response body.
+        message = "Flavor test could not be found."
+        self._test_from_response(
+            {"itemNotFound": {"message": message, "code": 404}},
+            message)
+
+    def test_from_response_webob_post_1_6_0(self):
+        # Tests error responses from webob 1.6.0 where the error details
+        # are in the response body.
+        message = "Flavor test could not be found."
+        self._test_from_response({"message": message, "code": 404}, message)