}

// AddressType represents the type of address referred to by an endpoint.
// +enum
type AddressType string

const (
	// AddressTypeIPv4 represents an IPv4 Address.
	AddressTypeIPv4 = AddressType(v1.IPv4Protocol)

	// AddressTypeIPv6 represents an IPv6 Address.
	AddressTypeIPv6 = AddressType(v1.IPv6Protocol)

	// AddressTypeFQDN represents a FQDN.
	AddressTypeFQDN = AddressType("FQDN")
)

) (proxy.Provider, error) {
	// Create an ipv4 instance of the single-stack proxier
	ipv4Proxier, err := NewProxier(ctx, v1.IPv4Protocol, ipt[0], sysctl,
		exec, syncPeriod, minSyncPeriod, masqueradeAll, localhostNodePorts, masqueradeBit,
		localDetectors[v1.IPv4Protocol], hostname, nodeIPs[v1.IPv4Protocol],
		recorder, healthzServer, nodePortAddresses, initOnly)
	if err != nil {

	// Create an ipv4 instance of the single-stack proxier
	ipv4Proxier, err := NewProxier(v1.IPv4Protocol, syncPeriod, minSyncPeriod,
		hostname, nodeIPs[v1.IPv4Protocol], recorder, healthzServer,
		healthzBindAddress, config)

	if err != nil {
		return nil, fmt.Errorf("unable to create ipv4 proxier: %v, hostname: %s, nodeIP:%v", err, hostname, nodeIPs[v1.IPv4Protocol])
	}

	ipv6Proxier, err := NewProxier(v1.IPv6Protocol, syncPeriod, minSyncPeriod,

	// Create an ipv4 instance of the single-stack proxier
	ipv4Proxier, err := NewProxier(ctx, v1.IPv4Protocol, ipt[0], ipvs, ipset, sysctl,
		exec, syncPeriod, minSyncPeriod, filterCIDRs(false, excludeCIDRs), strictARP,
		tcpTimeout, tcpFinTimeout, udpTimeout, masqueradeAll, masqueradeBit,
		localDetectors[v1.IPv4Protocol], hostname, nodeIPs[v1.IPv4Protocol], recorder,
		healthzServer, scheduler, nodePortAddresses, initOnly)
	if err != nil {

// TODO: consolidate helpers
// copied from pkg/proxy/util/utils.go
func convertToV1IPFamily(ipFamily netutils.IPFamily) v1.IPFamily {
	switch ipFamily {
	case netutils.IPv4:
		return v1.IPv4Protocol
	case netutils.IPv6:
		return v1.IPv6Protocol
	}

	return v1.IPFamilyUnknown

	}{
		{
			name: "ipv4, localhost-nodeports enabled",

			family:             v1.IPv4Protocol,
			localhostNodePorts: true,
			nodePortAddresses:  nil,

			allowAltNodeIP: true,
			expectFirewall: true,
		},
		{
			name: "ipv4, localhost-nodeports disabled",

			family:             v1.IPv4Protocol,
			localhostNodePorts: false,
			nodePortAddresses:  nil,

			allowAltNodeIP: true,

		e.queue.AddAfter(key, e.endpointUpdatesBatchPeriod)
	}
}

func podToEndpointAddressForService(svc *v1.Service, pod *v1.Pod) (*v1.EndpointAddress, error) {
	var endpointIP string
	ipFamily := v1.IPv4Protocol

	if len(svc.Spec.IPFamilies) > 0 {
		// controller is connected to an api-server that correctly sets IPFamilies
		ipFamily = svc.Spec.IPFamilies[0] // this works for headful and headless
	} else {

// to express the family of an IP expressed by a type (e.g. service.spec.ipFamilies).
type IPFamily string

const (
	// IPv4Protocol indicates that this IP is IPv4 protocol
	IPv4Protocol IPFamily = "IPv4"
	// IPv6Protocol indicates that this IP is IPv6 protocol
	IPv6Protocol IPFamily = "IPv6"
)

var supportedServiceInternalTrafficPolicy = sets.New(core.ServiceInternalTrafficPolicyCluster, core.ServiceInternalTrafficPolicyLocal)

var supportedServiceIPFamily = sets.New(core.IPv4Protocol, core.IPv6Protocol)
var supportedServiceIPFamilyPolicy = sets.New(
	core.IPFamilyPolicySingleStack,
	core.IPFamilyPolicyPreferDualStack,
	core.IPFamilyPolicyRequireDualStack)

// to express the family of an IP expressed by a type (e.g. service.spec.ipFamilies).
// +enum
type IPFamily string

const (
	// IPv4Protocol indicates that this IP is IPv4 protocol
	IPv4Protocol IPFamily = "IPv4"
	// IPv6Protocol indicates that this IP is IPv6 protocol
	IPv6Protocol IPFamily = "IPv6"
	// IPFamilyUnknown indicates that this IP is unknown protocol