add Stringer interface for eventType

pkg/controller/garbagecollector/graph_builder.go

@@ -38,6 +38,19 @@ import (
 
 type eventType int
 
+func (e eventType) String() string {
+	switch e {
+	case addEvent:
+		return "add"
+	case updateEvent:
+		return "update"
+	case deleteEvent:
+		return "delete"
+	default:
+		return fmt.Sprintf("unknown(%d)", int(e))
+	}
+}
+
 const (
 	addEvent eventType = iota
 	updateEvent
@@ -427,7 +440,7 @@ func (gb *GraphBuilder) processGraphChanges() bool {
 		utilruntime.HandleError(fmt.Errorf("cannot access obj: %v", err))
 		return true
 	}
-	glog.V(5).Infof("GraphBuilder process object: %s/%s, namespace %s, name %s, event type %s", typeAccessor.GetAPIVersion(), typeAccessor.GetKind(), accessor.GetNamespace(), accessor.GetName(), event.eventType)
+	glog.V(5).Infof("GraphBuilder process object: %s/%s, namespace %s, name %s, event type %v", typeAccessor.GetAPIVersion(), typeAccessor.GetKind(), accessor.GetNamespace(), accessor.GetName(), event.eventType)
 	// Check if the node already exsits
 	existingNode, found := gb.uidToNode.Read(accessor.GetUID())
 	switch {