Fix handling of unimplemented host actions

Fixes bug #1060884

Host actions like enable/disable, maintenance mode and power management
are not implemented in most virt drivers.

In the case of set_host_enabled() in the libvirt driver, we have a no-op
implementation. In other cases we have an implementation which raises
NotImplementedError. Since the default implementation is to do this, we
should just remove the redundant methods from the drivers which don't
actually implement these actions. This ensures NotImplementedError is
consistently raised.

On the API side, rather than looking at the return value of these
methods to determine whether they're implemented, we should just catch
NotImplementedError and return a sensible error message.

In order to do this, we need to ensure the NotImplementedError is
properly deserialized from the RemoteError which will encapsualte
it. The fix for bug #1086798 ensures this happens.

Finally, add some tests to make sure we properly respond with 501
when the virt driver doesn't implement these actions.

Change-Id: I2d4fc51a4b16d5230e61bde75915142ea450557d

1 files changed, 14 insertions, 10 deletions

diff --git a/nova/api/openstack/compute/contrib/hosts.py b/nova/api/openstack/compute/contrib/hosts.py
index 0d2b68f11..7da596a78 100644
--- a/nova/api/openstack/compute/contrib/hosts.py
+++ b/nova/api/openstack/compute/contrib/hosts.py
@@ -176,9 +176,11 @@ class HostController(object):
         context = req.environ['nova.context']
         LOG.audit(_("Putting host %(host)s in maintenance "
                     "mode %(mode)s.") % locals())
-        result = self.api.set_host_maintenance(context, host, mode)
-        if result not in ("on_maintenance", "off_maintenance"):
-            raise webob.exc.HTTPBadRequest(explanation=result)
+        try:
+            result = self.api.set_host_maintenance(context, host, mode)
+        except NotImplementedError:
+            msg = _("Virt driver does not implement host maintenance mode.")
+            raise webob.exc.HTTPNotImplemented(explanation=msg)
         return {"host": host, "maintenance_mode": result}
 
     def _set_enabled_status(self, req, host, enabled):
@@ -186,11 +188,12 @@ class HostController(object):
         context = req.environ['nova.context']
         state = "enabled" if enabled else "disabled"
         LOG.audit(_("Setting host %(host)s to %(state)s.") % locals())
-        result = self.api.set_host_enabled(context, host=host,
-                enabled=enabled)
-        if result not in ("enabled", "disabled"):
-            # An error message was returned
-            raise webob.exc.HTTPBadRequest(explanation=result)
+        try:
+            result = self.api.set_host_enabled(context, host=host,
+                                               enabled=enabled)
+        except NotImplementedError:
+            msg = _("Virt driver does not implement host disabled status.")
+            raise webob.exc.HTTPNotImplemented(explanation=msg)
         return {"host": host, "status": result}
 
     def _host_power_action(self, req, host, action):
@@ -200,8 +203,9 @@ class HostController(object):
         try:
             result = self.api.host_power_action(context, host=host,
                     action=action)
-        except NotImplementedError as e:
-            raise webob.exc.HTTPBadRequest(explanation=e.msg)
+        except NotImplementedError:
+            msg = _("Virt driver does not implement host power management.")
+            raise webob.exc.HTTPNotImplemented(explanation=msg)
         return {"host": host, "power_action": result}
 
     @wsgi.serializers(xml=HostActionTemplate)