Controller reconcile function

The reconcile function is responsible for enforcing the desired CR state on the actual state of the system. It runs each time an event occurs on a watched CR or resource, and will return some value depending on whether those states match or not.

In this way, every Controller has a Reconciler object with a Reconcile() method that implements the reconcile loop. The reconcile loop is passed the Request argument which is a Namespace/Name key used to lookup the primary resource object, Memcached, from the cache:

import (
	ctrl ""

	cachev1alpha1 ""

func (r *MemcachedReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
  _ = context.Background()

  // Lookup the Memcached instance for this reconcile request
  memcached := &cachev1alpha1.Memcached{}
  err := r.Get(ctx, req.NamespacedName, memcached)

For a complete guide on Reconcilers, Clients, and interacting with resource Events, see the Client API doc.

The following are a few possible return options for a Reconciler:

// With the error:
return ctrl.Result{}, err

// Without an error:
return ctrl.Result{Requeue: true}, nil

// Therefore, to stop the Reconcile, use:
return ctrl.Result{}, nil

// Reconcile again after X time:
 return ctrl.Result{RequeueAfter: nextRun.Sub(r.Now())}, nil

For more details, check the Reconcile godoc.