package xds

// xds uses ADSC to call XDS

import (
	"context"
	"crypto/tls"
	"fmt"
	"strings"

	discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials"

	"istio.io/istio/istioctl/pkg/clioptions"
	"istio.io/istio/pilot/pkg/model"
	"istio.io/istio/pkg/adsc"
	"istio.io/istio/pkg/kube"
)

const (

}

// Unwrap returns the error wrapped in NetworkError.
func (n *NetworkError) Unwrap() error {
	return n.Err
}

// Client - http based RPC client.
type Client struct {
	connected int32 // ref: https://golang.org/pkg/sync/atomic/#pkg-note-BUG
	_         int32 // For 64 bits alignment
	lastConn  int64

	// HealthCheckFn is the function set to test for health.
	// If not set the client will not keep track of health.