makes volume versions display properly

* The compute versions controller changed during a refactor and broke
   the volume versions controller (since we are using it as a base class)
 * Added naive test
 * fixes bug 963357

Change-Id: Ica9c65952b800d316d264db11f89e369e56bcade

nova/api/openstack/volume/versions.py

@@ -56,15 +56,19 @@ VERSIONS = {
 
 
 class Versions(versions.Versions):
-    def dispatch(self, request, *args):
-        """Respond to a request for all OpenStack API versions."""
-        builder = views_versions.get_view_builder(request)
-        if request.path == '/':
-            # List Versions
-            return builder.build_versions(VERSIONS)
-        else:
-            # Versions Multiple Choice
-            return builder.build_choices(VERSIONS, request)
+    @wsgi.serializers(xml=versions.VersionsTemplate,
+                      atom=versions.VersionsAtomSerializer)
+    def index(self, req):
+        """Return all versions."""
+        builder = views_versions.get_view_builder(req)
+        return builder.build_versions(VERSIONS)
+
+    @wsgi.serializers(xml=versions.ChoicesTemplate)
+    @wsgi.response(300)
+    def multi(self, req):
+        """Return multiple choices."""
+        builder = views_versions.get_view_builder(req)
+        return builder.build_choices(VERSIONS, req)
 
 
 class VolumeVersionV1(object):

nova/tests/api/openstack/volume/test_router.py

@@ -17,6 +17,7 @@
 from nova.api.openstack import volume
 from nova.api.openstack.volume import snapshots
 from nova.api.openstack.volume import volumes
+from nova.api.openstack.volume import versions
 from nova.api.openstack import wsgi
 from nova import flags
 from nova import log as logging
@@ -60,6 +61,14 @@ class VolumeRouterTestCase(test.TestCase):
         response = req.get_response(self.app)
         self.assertEqual(200, response.status_int)
 
+    def test_versions_dispatch(self):
+        req = fakes.HTTPRequest.blank('/')
+        req.method = 'GET'
+        req.content_type = 'application/json'
+        resource = versions.Versions()
+        result = resource.dispatch(resource.index, req, {})
+        self.assertTrue(result)
+
     def test_volumes(self):
         req = fakes.HTTPRequest.blank('/fake/volumes')
         req.method = 'GET'