cloudfoundry/cf-k8s-controllers

package repositories

import "sigs.k8s.io/controller-runtime/pkg/client"

type Metadata struct {
    Annotations map[string]string
    Labels      map[string]string
}

type MetadataPatch struct {
    Annotations map[string]*string
    Labels      map[string]*string
}

func (p *MetadataPatch) Apply(obj client.Object) {
    if obj.GetAnnotations() == nil {
        obj.SetAnnotations(map[string]string{})
    }

    if obj.GetLabels() == nil {
        obj.SetLabels(map[string]string{})
    }

    patchMap(obj.GetAnnotations(), p.Annotations)
    patchMap(obj.GetLabels(), p.Labels)
}

func patchMap(original map[string]string, patch map[string]*string) {
    for key, ptrToPatchValue := range patch {
        if ptrToPatchValue != nil {
            original[key] = *ptrToPatchValue
        } else {
            delete(original, key)
        }
    }
}