var log = istiolog.RegisterScope("grpcgen", "xDS Generator for Proxyless gRPC")

type GrpcConfigGenerator struct{}

func clusterKey(hostname string, port int) string {
	return subsetClusterKey("", hostname, port)
}

func subsetClusterKey(subset, hostname string, port int) string {
	return model.BuildSubsetKey(model.TrafficDirectionOutbound, subset, host.Name(hostname), port)
}

	// subset clusters
	if len(destinationRule.GetSubsets()) > 0 {
		subsetClusters = make([]*cluster.Cluster, 0, len(destinationRule.GetSubsets()))
		for _, subset := range destinationRule.GetSubsets() {
			subsetKey := subsetClusterKey(subset.Name, string(b.hostname), b.portNum)
			if !b.filter.Contains(subsetKey) {
				continue
			}
			c := edsCluster(subsetKey)