Fix unrescue in invalid state

Fixes bug 965667

Unrescue did not check for InstanceInvalidState exception and return the
appropriate error.

Change-Id: I3ca2c1dae09bd149086bfe67e2233c8359d5c8f8

nova/api/openstack/compute/contrib/rescue.py

@@ -72,7 +72,11 @@ def _unrescue(self, req, id, body):
         context = req.environ["nova.context"]
         authorize(context)
         instance = self._get_instance(context, id)
-        self.compute_api.unrescue(context, instance)
+        try:
+            self.compute_api.unrescue(context, instance)
+        except exception.InstanceInvalidState as state_error:
+            common.raise_http_conflict_for_instance_invalid_state(state_error,
+                                                                  'unrescue')
         return webob.Response(status_int=202)
 
 

nova/tests/api/openstack/compute/contrib/test_rescue.py

@@ -93,3 +93,18 @@ def test_unrescue(self):
 
         resp = req.get_response(fakes.wsgi_app())
         self.assertEqual(resp.status_int, 202)
+
+    def test_unrescue_of_active_instance(self):
+        body = dict(unrescue=None)
+
+        def fake_unrescue(*args, **kwargs):
+            raise exception.InstanceInvalidState('fake message')
+
+        self.stubs.Set(compute.api.API, "unrescue", fake_unrescue)
+        req = webob.Request.blank('/v2/fake/servers/test_inst/action')
+        req.method = "POST"
+        req.body = json.dumps(body)
+        req.headers["content-type"] = "application/json"
+
+        resp = req.get_response(fakes.wsgi_app())
+        self.assertEqual(resp.status_int, 409)