// set of active ClusterIPs.
	clusterIPsSet = "cluster-ips"

	// handling for services with no endpoints
	serviceEndpointsCheckChain  = "service-endpoints-check"
	nodePortEndpointsCheckChain = "nodeport-endpoints-check"
	noEndpointServicesMap       = "no-endpoint-services"
	noEndpointNodePortsMap      = "no-endpoint-nodeports"
	rejectChain                 = "reject-chain"

func cloneLocalityLbEndpoints(endpoints []*endpoint.LocalityLbEndpoints) []*endpoint.LocalityLbEndpoints {
	out := make([]*endpoint.LocalityLbEndpoints, 0, len(endpoints))
	for _, ep := range endpoints {
		clone := CloneLocalityLbEndpoint(ep)
		out = append(out, clone)
	}
	return out
}

// return a shallow copy of LocalityLbEndpoints
func CloneLocalityLbEndpoint(ep *endpoint.LocalityLbEndpoints) *endpoint.LocalityLbEndpoints {

    // that match less (or, eventually, none) preferences.
    // For instance, with `[NETWORK, REGION, ZONE]`, we will send to:
    // 1. Endpoints matching `[NETWORK, REGION, ZONE]`
    // 2. Endpoints matching `[NETWORK, REGION]`
    // 3. Endpoints matching `[NETWORK]`
    // 4. Any endpoints
    FAILOVER = 2;
  }

func expandEndpoints(s string) ([]string, error) {
	var endpoints []string
	for _, endpoint := range strings.Split(s, ",") {
		endpoint = strings.TrimSpace(endpoint)
		if endpoint == "" {
			continue
		}
		if !ellipses.HasEllipses(endpoint) {
			endpoints = append(endpoints, endpoint)
			continue
		}

		pattern, err := ellipses.FindEllipsesPatterns(endpoint)
		if err != nil {

	if oldIstioEndpoints == nil {
		// If there are no old endpoints, we should push with incoming endpoints as there is nothing to compare.
		needPush = true
	} else {
		newIstioEndpoints = make([]*IstioEndpoint, 0, len(istioEndpoints))
		// Check if new Endpoints are ready to be pushed. This check
		// will ensure that if a new pod comes with a non ready endpoint,
		// we do not unnecessarily push that config to Envoy.

      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
        insecure_skip_verify: true
    - honor_labels: true
      job_name: kubernetes-service-endpoints
      kubernetes_sd_configs:
      - role: endpoints
      relabel_configs:
      - action: keep
        regex: true
        source_labels:
        - __meta_kubernetes_service_annotation_prometheus_io_scrape
      - action: drop

	if svc.Spec.TrafficDistribution != nil && *svc.Spec.TrafficDistribution == v1.ServiceTrafficDistributionPreferClose {
		lb = &workloadapi.LoadBalancing{
			// Prefer endpoints in close zones, but allow spilling over to further endpoints where required.
			RoutingPreference: []workloadapi.LoadBalancing_Scope{
				workloadapi.LoadBalancing_NETWORK,
				workloadapi.LoadBalancing_REGION,
				workloadapi.LoadBalancing_ZONE,

		},
	}

	sortEndpoints := func(endpoints []*endpoint.LocalityLbEndpoints) {
		sort.SliceStable(endpoints, func(i, j int) bool {
			if strings.Compare(endpoints[i].Locality.Region, endpoints[j].Locality.Region) < 0 {
				return true
			}
			if strings.Compare(endpoints[i].Locality.Zone, endpoints[j].Locality.Zone) < 0 {
				return true
			}

	}
	for i := range endpoints {
		endpoints[i].SetPoolIndex(poolIdx)
		endpoints[i].SetSetIndex(i / drivesPerSet)
		endpoints[i].SetDiskIndex(i % drivesPerSet)
	}
	return endpoints
}

func getEndpointsLocalAddr(endpointServerPools EndpointServerPools) string {
	for _, endpoints := range endpointServerPools {
		for _, endpoint := range endpoints.Endpoints {
			if endpoint.IsLocal && endpoint.Type() == URLEndpointType {

}

// buildExternalSDSCluster generates a cluster that acts as external SDS server
func (cb *ClusterBuilder) buildExternalSDSCluster(addr string) *cluster.Cluster {
	ep := &endpoint.LbEndpoint{
		HostIdentifier: &endpoint.LbEndpoint_Endpoint{
			Endpoint: &endpoint.Endpoint{
				Address: &core.Address{
					Address: &core.Address_Pipe{
						Pipe: &core.Pipe{
							Path: addr,
						},
					},
				},
			},
		},
	}