limitations under the License.
*/

package util

import (
	"net"

	"k8s.io/klog/v2"
	netutils "k8s.io/utils/net"
)

// IPPart returns just the IP part of an IP or IP:port or endpoint string. If the IP
// part is an IPv6 address enclosed in brackets (e.g. "[fd00:1::5]:9999"),
// then the brackets are stripped as well.
func IPPart(s string) string {
	if ip := netutils.ParseIPSloppy(s); ip != nil {

// Parameters:
// * endpointsNN refers to a NamespacedName representing the Endpoints resource.
// * epCache refers to a EndpointPortCache for the specified Endpoints reosource.
func (c *Cache) UpdateEndpointPortCache(endpointsNN types.NamespacedName, epCache *EndpointPortCache) {
	c.lock.Lock()
	defer c.lock.Unlock()

	prevNumEndpoints := 0
	if existingEPCache, ok := c.cache[endpointsNN]; ok {

        def endpoint1 = queue.newEndpoint()
        def endpoint2 = queue.newEndpoint()

        and:
        queue.empty(endpoint1)
        queue.empty(endpoint2)

        when:
        queue.dispatch(message)
        queue.dispatch(message2)
        def messages1 = []
        endpoint1.take(messages1)
        def messages2 = []
        endpoint2.take(messages2)

        then:

// addEndpoints adds an Endpoint for each unique endpoint.
func (cache *EndpointSliceCache) addEndpoints(svcPortName *ServicePortName, portNum int, endpointSet map[string]Endpoint, endpoints []discovery.Endpoint) map[string]Endpoint {
	if endpointSet == nil {
		endpointSet = map[string]Endpoint{}
	}

	// iterate through endpoints to add them to endpointSet.
	for _, endpoint := range endpoints {
		if len(endpoint.Addresses) == 0 {

		if svcInfo, ok := svcPortMap[epSvcPair.ServicePortName]; ok {
			endpointIP := proxyutil.IPPart(epSvcPair.Endpoint)
			nodePort := svcInfo.NodePort()
			var err error
			if nodePort != 0 {
				err = ct.ClearEntriesForPortNAT(endpointIP, nodePort, v1.ProtocolUDP)
				if err != nil {
					klog.ErrorS(err, "Failed to delete nodeport-related endpoint connections", "servicePortName", epSvcPair.ServicePortName)
				}
			}

				Endpoints:  []discovery.Endpoint{endpoint1, endpoint2},
			},
			expectChanged: false,
		},
		"identical with endpoints out of order": {
			cache: NewEndpointSliceCache("", v1.IPv4Protocol, nil, nil),
			initialSlice: &discovery.EndpointSlice{
				ObjectMeta: objMeta,
				Ports:      []discovery.EndpointPort{port443},
				Endpoints:  []discovery.Endpoint{endpoint1, endpoint2},
			},

	endpointsNN := types.NamespacedName{Name: endpoints.Name, Namespace: endpoints.Namespace}
	r.metricsCache.UpdateEndpointPortCache(endpointsNN, epMetrics)

	return r.finalize(endpoints, slices)
}

// reconcileByPortMapping compares the endpoints found in existing slices with
// the list of desired endpoints and returns lists of slices to create, update,
// and delete.

SataQiu <******@****.***> 1713430345 +0800

	kruntime "k8s.io/apimachinery/pkg/runtime"
	apirequest "k8s.io/apiserver/pkg/endpoints/request"
	"k8s.io/apiserver/pkg/registry/rest"
	"k8s.io/apiserver/pkg/storage"
	"k8s.io/apiserver/pkg/storage/storagebackend"
	storagefactory "k8s.io/apiserver/pkg/storage/storagebackend/factory"
	endpointsv1 "k8s.io/kubernetes/pkg/api/v1/endpoints"
)

// Leases is an interface which assists in managing the set of active masters

SataQiu <******@****.***> 1702613527 +0800