Constructor — Zero Changes

2 min read

You have a working controller-runtime operator. The reconcile logic is solid. What you want to remove is the machinery around it — the manager, the workqueue, the scheme registration, the leader election setup, the metrics. Not rewrite the operator from scratch.

Option 04 is the zero-change path. Your Reconcile method is completely untouched. Two lines wire it into Orkestra.

ork init --pack from-controller-runtime
cd from-controller-runtime/04-constructor-migration

What you will learn

  • How kubeclient.ToClient and domain.ReconcilerFrom bridge a controller-runtime reconciler into Orkestra
  • What default: false means in the Katalog — the GenericReconciler is disabled, the constructor owns the loop
  • What the runtime provides that ctrl.NewManager previously handled
  • How ork migrate generates the constructor automatically

The only new code

func NewWebAppReconciler(kube kubeclient.Interface) domain.Reconciler {
    return domain.ReconcilerFrom(&WebAppReconciler{
        Client: kubeclient.ToClient(kube),
    })
}
  • kubeclient.ToClient(kube) — wraps Orkestra’s kubeclient.Interface as a client.Client. The same type your struct already holds.
  • domain.ReconcilerFrom(r) — adapts the ctrl.Request signature so Orkestra’s worker pool can call it.

That is all. Your Reconcile method, your struct, your r.Get / r.Create / r.Status().Update() calls — unchanged.

What you removed

SetupWithManager, Scheme, scheme registration, main.go, leader election setup. Orkestra provides all of it — informer, workqueue, worker pool, panic recovery, Prometheus metrics, health endpoints, leader election.

ork migrate automates this

ork migrate ./controller/webapp_controller.go -o ./output

Default mode (--mode toclient) does exactly what this option shows: removes SetupWithManager, injects the two-line constructor, leaves everything else untouched.

See 06 — ork migrate or run option 06 in the pack.

Try it

ork init --pack from-controller-runtime
cd from-controller-runtime/04-constructor-migration
# Follow steps in README

→ 06 — Constructor: Orkestra resources