Kubebuilder Finalizer Attempt

controller.go

func (r *MyReconciler) Reconcile(request reconcile.Request) (reconcile.Result, error) {
    instance := &v1beta1.MyInstance{}
    err := r.Get(context.TODO(), request.NamespacedName, instance)
    if err != nil {
        if errors.IsNotFound(err) {
            // Object not found, return
            return reconcile.Result{}, nil
        }
        return reconcile.Result{}, err
    }
    
    if instance.ObjectMeta.DeletionTimestamp != nil {
        // Instance is scheduled for deletion, but probably has finalizers
        switch instance.ObjectMeta.Finalizers[0] {
        case "delete.remote.resources":
            _, err := SomeFunctionToDeleteRemoteResources(instance)
            if err != nil {
                return reconcile.Result{}, err
            }
            instance.ObjectMeta.Finalizers = append(instance.ObjectMeta.Finalizers[:0], instance.ObjectMeta.Finalizers[1:]...)
            r.Update(context.TODO(), instance)
            return reconcile.Result{}, nil
        default:
            log.Fatalf("Unknown finalizer \"%s\". Cannot process deletion event", current)
            return reconcile.Result{}, nil
        }
    }
    
    // Create Remote Resources
    _, err := SomeFunctionToCreateRemoteResources(instance)
    if err != nil {
        return reconcile.Result{}, err
    }
    // Add Finalizers to Prevent Deletion without cleaning up remote resources
    instance.ObjectMeta.Finalizers = append(instance.ObjectMeta.Finalizers, "delete.remote.resources")
    r.Update(context.TODO(), instance)
    
    return reconcile.Result{}, nil
}