K8s operator listen to specific config map

Question

I've an operator which run a reconcile for some object changes, now I want to add ability to reconcile when specific configmap is changing, (my operator doesn't responsible on this CM just needs to listen to it and read on changes...) from the docs I think I need to use the Owns(&corev1.Configmap{}) but not sure how to do it and provide specific configmap name to watch,

How should I refer to specific configmap name: foo in namespace=bar

https://sdk.operatorframework.io/docs/building-operators/golang/references/event-filtering/#using-predicates

Answer 1

I haven't used this specific operator framework, but the concepts are familiar. Create a predicate function like this and use it when you are creating a controller by passing it into the SDK's WithEventFilter function:

func specificConfigMap(name, namespace string) predicate.Predicate {
    return predicate.Funcs{
        UpdateFunc: func(e event.UpdateEvent) bool {
            configmap := e.NewObject.(*corev1.ConfigMap)
            if configmap.Name == name && configmap.Namespace == namespace {
                return true
            }
            return false
        },
    }
}