kube-proxy: update internal endpoints map with 'serving' and 'terminating' condition from EndpointSlice

Signed-off-by: Andrew Sy Kim <kim.andrewsy@gmail.com>

pkg/proxy/types.go

@@ -97,6 +97,20 @@ type Endpoint interface {
 	String() string
 	// GetIsLocal returns true if the endpoint is running in same host as kube-proxy, otherwise returns false.
 	GetIsLocal() bool
+	// IsReady returns true if an endpoint is ready and not terminating.
+	// This is only set when watching EndpointSlices. If using Endpoints, this is always
+	// true since only ready endpoints are read from Endpoints.
+	IsReady() bool
+	// IsServing returns true if an endpoint is ready. It does not account
+	// for terminating state.
+	// This is only set when watching EndpointSlices. If using Endpoints, this is always
+	// true since only ready endpoints are read from Endpoints.
+	IsServing() bool
+	// IsTerminating retruns true if an endpoint is terminating. For pods,
+	// that is any pod with a deletion timestamp.
+	// This is only set when watching EndpointSlices. If using Endpoints, this is always
+	// false since terminating endpoints are always excluded from Endpoints.
+	IsTerminating() bool
 	// GetTopology returns the topology information of the endpoint.
 	GetTopology() map[string]string
 	// IP returns IP part of the endpoint.