func IsServiceIPSet(service *Service) bool {
	return service.Spec.ClusterIP != ClusterIPNone && service.Spec.ClusterIP != ""
}
this function aims to check if the service's ClusterIP is set or not
the objective is not to perform validation here
package api
import (
	"crypto/md5"
	"encoding/json"
	"fmt"
	"reflect"
	"strings"
	"time"
	"k8s.io/kubernetes/pkg/api/resource"
	"k8s.io/kubernetes/pkg/api/unversioned"
	"k8s.io/kubernetes/pkg/conversion"
	"k8s.io/kubernetes/pkg/fields"
	"k8s.io/kubernetes/pkg/labels"
	"k8s.io/kubernetes/pkg/runtime"
	"k8s.io/kubernetes/pkg/types"
	"k8s.io/kubernetes/pkg/util/sets"
	"github.com/davecgh/go-spew/spew"
)
type ConversionError struct {
	In, Out interface{}
	Message string
}
func (c *ConversionError) Error() string {
	return spew.Sprintf(
		"Conversion error: %s. (in: %v(%+v) out: %v)",
		c.Message, reflect.TypeOf(c.In), c.In, reflect.TypeOf(c.Out),
	)
}
var Semantic = conversion.EqualitiesOrDie(
	func(a, b resource.Quantity) bool {
		return a.Cmp(b) == 0
	},
	func(a, b unversioned.Time) bool {
		return a.UTC() == b.UTC()
	},
	func(a, b labels.Selector) bool {
		return a.String() == b.String()
	},
	func(a, b fields.Selector) bool {
		return a.String() == b.String()
	},
)
var standardResourceQuotaScopes = sets.NewString(
	string(ResourceQuotaScopeTerminating),
	string(ResourceQuotaScopeNotTerminating),
	string(ResourceQuotaScopeBestEffort),
	string(ResourceQuotaScopeNotBestEffort),
)
func IsStandardResourceQuotaScope(str string) bool {
	return standardResourceQuotaScopes.Has(str)
}
var podObjectCountQuotaResources = sets.NewString(
	string(ResourcePods),
)
var podComputeQuotaResources = sets.NewString(
	string(ResourceCPU),
	string(ResourceMemory),
	string(ResourceLimitsCPU),
	string(ResourceLimitsMemory),
	string(ResourceRequestsCPU),
	string(ResourceRequestsMemory),
)
func IsResourceQuotaScopeValidForResource(scope ResourceQuotaScope, resource string) bool {
	switch scope {
	case ResourceQuotaScopeTerminating, ResourceQuotaScopeNotTerminating, ResourceQuotaScopeNotBestEffort:
		return podObjectCountQuotaResources.Has(resource) || podComputeQuotaResources.Has(resource)
	case ResourceQuotaScopeBestEffort:
		return podObjectCountQuotaResources.Has(resource)
	default:
		return true
	}
}
var standardContainerResources = sets.NewString(
	string(ResourceCPU),
	string(ResourceMemory),
)
func IsStandardContainerResourceName(str string) bool {
	return standardContainerResources.Has(str)
}
var standardLimitRangeTypes = sets.NewString(
	string(LimitTypePod),
	string(LimitTypeContainer),
)
func IsStandardLimitRangeType(str string) bool {
	return standardLimitRangeTypes.Has(str)
}
var standardQuotaResources = sets.NewString(
	string(ResourceCPU),
	string(ResourceMemory),
	string(ResourceRequestsCPU),
	string(ResourceRequestsMemory),
	string(ResourceLimitsCPU),
	string(ResourceLimitsMemory),
	string(ResourcePods),
	string(ResourceQuotas),
	string(ResourceServices),
	string(ResourceReplicationControllers),
	string(ResourceSecrets),
	string(ResourcePersistentVolumeClaims),
	string(ResourceConfigMaps),
	string(ResourceServicesNodePorts),
	string(ResourceServicesLoadBalancers),
)
func IsStandardQuotaResourceName(str string) bool {
	return standardQuotaResources.Has(str)
}
var standardResources = sets.NewString(
	string(ResourceCPU),
	string(ResourceMemory),
	string(ResourceRequestsCPU),
	string(ResourceRequestsMemory),
	string(ResourceLimitsCPU),
	string(ResourceLimitsMemory),
	string(ResourcePods),
	string(ResourceQuotas),
	string(ResourceServices),
	string(ResourceReplicationControllers),
	string(ResourceSecrets),
	string(ResourceConfigMaps),
	string(ResourcePersistentVolumeClaims),
	string(ResourceStorage),
)
func IsStandardResourceName(str string) bool {
	return standardResources.Has(str)
}
var integerResources = sets.NewString(
	string(ResourcePods),
	string(ResourceQuotas),
	string(ResourceServices),
	string(ResourceReplicationControllers),
	string(ResourceSecrets),
	string(ResourceConfigMaps),
	string(ResourcePersistentVolumeClaims),
	string(ResourceServicesNodePorts),
	string(ResourceServicesLoadBalancers),
)
func IsIntegerResourceName(str string) bool {
	return integerResources.Has(str)
}
func NewDeleteOptions(grace int64) *DeleteOptions {
	return &DeleteOptions{GracePeriodSeconds: &grace}
}
func NewPreconditionDeleteOptions(uid string) *DeleteOptions {
	u := types.UID(uid)
	p := Preconditions{UID: &u}
	return &DeleteOptions{Preconditions: &p}
}
func NewUIDPreconditions(uid string) *Preconditions {
	u := types.UID(uid)
	return &Preconditions{UID: &u}
}