fix(wsgi): a non-existing queue stats returns 404

Fixes: Bug#1192180
Change-Id: Iaf1e77b8ce01b33de63979164ea23ea086bf81d4

marconi/tests/transport/wsgi/test_queue_lifecycle.py

@@ -33,6 +33,10 @@ class QueueLifecycleBaseTest(base.TestBase):
         path = '/v1/queues/gumshoe'
 
         for project_id in ('480924', 'foo', '', None):
+            # Stats
+            self.simulate_get(path + '/stats', project_id)
+            self.assertEquals(self.srmock.status, falcon.HTTP_404)
+
             # Create
             doc = '{"messages": {"ttl": 600}}'
             self.simulate_put(path, project_id, body=doc)

marconi/transport/wsgi/stats.py

@@ -16,7 +16,9 @@
 import falcon
 
 import marconi.openstack.common.log as logging
+from marconi.storage import exceptions as storage_exceptions
 from marconi.transport import helpers
+from marconi.transport.wsgi import exceptions as wsgi_exceptions
 
 
 LOG = logging.getLogger(__name__)
@@ -38,8 +40,10 @@ class Resource(object):
             resp.body = helpers.to_json(resp_dict)
             resp.status = falcon.HTTP_200
 
+        except storage_exceptions.DoesNotExist:
+            raise falcon.HTTPNotFound()
+
         except Exception as ex:
             LOG.exception(ex)
-            title = _('Service temporarily unavailable')
-            msg = _('Please try again in a few seconds.')
-            raise falcon.HTTPServiceUnavailable(title, msg, 30)
+            description = _('Queue stats could not be read.')
+            raise wsgi_exceptions.HTTPServiceUnavailable(description)