func GenerateHeadlessService()

in controllers/util/solr_util.go [888:937]
44 lines of code
6 McCabe index (conditional complexity)

func GenerateHeadlessService(solrCloud *solr.SolrCloud) *corev1.Service {
	labels := solrCloud.SharedLabelsWith(solrCloud.GetLabels())
	labels["service-type"] = "headless"

	selectorLabels := solrCloud.SharedLabels()
	selectorLabels["technology"] = solr.SolrTechnologyLabel

	var annotations map[string]string

	// Add externalDNS annotation if necessary
	extOpts := solrCloud.Spec.SolrAddressability.External
	if extOpts != nil && extOpts.Method == solr.ExternalDNS && !extOpts.HideNodes {
		annotations = make(map[string]string, 1)
		urls := []string{solrCloud.ExternalDnsDomain(extOpts.DomainName)}
		for _, domain := range extOpts.AdditionalDomainNames {
			urls = append(urls, solrCloud.ExternalDnsDomain(domain))
		}
		annotations["external-dns.alpha.kubernetes.io/hostname"] = strings.Join(urls, ",")
	}

	customOptions := solrCloud.Spec.CustomSolrKubeOptions.HeadlessServiceOptions
	if nil != customOptions {
		labels = MergeLabelsOrAnnotations(labels, customOptions.Labels)
		annotations = MergeLabelsOrAnnotations(annotations, customOptions.Annotations)
	}

	service := &corev1.Service{
		ObjectMeta: metav1.ObjectMeta{
			Name:        solrCloud.HeadlessServiceName(),
			Namespace:   solrCloud.GetNamespace(),
			Labels:      labels,
			Annotations: annotations,
		},
		Spec: corev1.ServiceSpec{
			Ports: []corev1.ServicePort{
				{
					Name:        SolrClientPortName,
					Port:        int32(solrCloud.NodePort()),
					Protocol:    corev1.ProtocolTCP,
					TargetPort:  intstr.FromString(SolrClientPortName),
					AppProtocol: getAppProtocol(solrCloud),
				},
			},
			Selector:                 selectorLabels,
			ClusterIP:                corev1.ClusterIPNone,
			PublishNotReadyAddresses: true,
		},
	}
	return service
}