code: func CreateDeleteNodeHandler(f func(node *v1.Node) error) func(obj interface{}) {
  	return func(originalObj interface{}) {
  		originalNode, isNode := originalObj.(*v1.Node)
  		// We can get DeletedFinalStateUnknown instead of *v1.Node here and
  		// we need to handle that correctly. #34692
  		if !isNode {
  			deletedState, ok := originalObj.(cache.DeletedFinalStateUnknown)
  			if !ok {
  				klog.Errorf("Received unexpected object: %v", originalObj)
  				return
  			}
  			originalNode, ok = deletedState.Obj.(*v1.Node)
  			if !ok {
  				klog.Errorf("DeletedFinalStateUnknown contained non-Node object: %v", deletedState.Obj)
  				return
  			}
  		}
  		node := originalNode.DeepCopy()
  		if err := f(node); err != nil {
  			utilruntime.HandleError(fmt.Errorf("Error while processing Node Add/Delete: %v", err))
  		}
  	}
  }
docs: // CreateDeleteNodeHandler creates a delete node handler. (Common to lifecycle and ipam)