func GetConfigs(kubeconfig string, names ...string) (string, error) {
	cmd := fmt.Sprintf("kubectl get %s --all-namespaces -o yaml --kubeconfig=%s", strings.Join(names, ","), kubeconfig)
	return Shell(cmd)
}
GetConfigs retrieves the configurations for the list of resources.
package util
import (
	"bufio"
	"bytes"
	"context"
	"errors"
	"fmt"
	"io/ioutil"
	"net"
	"net/http"
	"os"
	"path/filepath"
	"regexp"
	"strings"
	"text/template"
	"time"
	multierror "github.com/hashicorp/go-multierror"
	"golang.org/x/net/context/ctxhttp"
	"golang.org/x/sync/errgroup"
	"istio.io/pkg/log"
)
const (
	podFailedGet = "Failed_Get"
	statusField            = 2
	defaultClusterSubnet   = "24"
	defaultClusterSubnetv6 = "128"
	NodePortServiceType = "NodePort"
	LoadBalancerServiceType = "LoadBalancer"
	ingressHTTPServicePort = "80"
)
var (
	logDumpResources = []string{
		"pod",
		"service",
		"ingress",
	}
)
type PodInfo struct {
	Name string
	IPAddr string
}
func Fill(outFile, inFile string, values interface{}) error {
	tmpl, err := template.ParseFiles(inFile)
	if err != nil {
		return err
	}
	var filled bytes.Buffer
	w := bufio.NewWriter(&filled)
	if err := tmpl.Execute(w, values); err != nil {
		return err
	}
	if err := w.Flush(); err != nil {
		return err
	}
	if err := ioutil.WriteFile(outFile, filled.Bytes(), 0644); err != nil {
		return err
	}
	log.Infof("Created %s from template %s", outFile, inFile)
	return nil
}
func CreateAndFill(outDir, templateFile string, values interface{}) (string, error) {
	outFile, err := CreateTempfile(outDir, filepath.Base(templateFile), "yaml")
	if err != nil {
		log.Errorf("Failed to generate yaml %s: %v", templateFile, err)
		return "", err
	}
	if err := Fill(outFile, templateFile, values); err != nil {
		log.Errorf("Failed to generate yaml for template %s: %v", templateFile, err)
		return "", err
	}
	return outFile, nil
}
func CreateNamespace(n string, kubeconfig string) error {
	if _, err := ShellMuteOutput("kubectl create namespace %s --kubeconfig=%s", n, kubeconfig); err != nil {
		if !strings.Contains(err.Error(), "AlreadyExists") {
			return err
		}
	}
	log.Infof("namespace %s created\n", n)
	return nil
}
func DeleteNamespace(n string, kubeconfig string) error {
	if _, err := Shell("kubectl delete namespace %s --kubeconfig=%s", n, kubeconfig); err != nil {
		if !strings.Contains(err.Error(), "not found") {
			return err
		}
	}
	log.Infof("namespace %s deleted\n", n)
	return nil
}
func DeleteDeployment(d string, n string, kubeconfig string) error {
	_, err := Shell("kubectl delete deployment %s -n %s --kubeconfig=%s", d, n, kubeconfig)
	return err
}
func LabelNamespace(n, label, kubeconfig string) error {
	if _, err := Shell("kubectl label namespace %s %s --kubeconfig=%s", n, label, kubeconfig); err != nil {
		if !strings.Contains(err.Error(), "AlreadyExists") {
			return err
		}
	}
	log.Infof("label %s added to namespace %s", label, n)
	return nil
}
func NamespaceDeleted(n string, kubeconfig string) (bool, error) {
	output, err := ShellSilent("kubectl get namespace %s -o name --kubeconfig=%s", n, kubeconfig)
	if strings.Contains(output, "NotFound") {
		return true, nil
	}
	return false, err
}
func ValidatingWebhookConfigurationExists(name string, kubeconfig string) bool {
	output, _ := ShellSilent("kubectl get validatingwebhookconfiguration %s -o name --kubeconfig=%s", name, kubeconfig)
	return !strings.Contains(output, "NotFound")
}
func KubeApplyContents(namespace, yamlContents string, kubeconfig string) error {
	tmpfile, err := WriteTempfile(os.TempDir(), "kubeapply", ".yaml", yamlContents)
	if err != nil {
		return err
	}
	defer removeFile(tmpfile)
	return KubeApply(namespace, tmpfile, kubeconfig)
}
func kubeCommand(subCommand, namespace, yamlFileName string, kubeconfig string) string {
	if namespace == "" {
		return fmt.Sprintf("kubectl %s -f %s --kubeconfig=%s", subCommand, yamlFileName, kubeconfig)
	}
	return fmt.Sprintf("kubectl %s -n %s -f %s --kubeconfig=%s", subCommand, namespace, yamlFileName, kubeconfig)
}
func KubeApply(namespace, yamlFileName string, kubeconfig string) error {
	_, err := Shell(kubeCommand("apply", namespace, yamlFileName, kubeconfig))
	return err
}
func KubeCommand(command, namespace, yamlFileName string, kubeconfig string) error {
	_, err := Shell(kubeCommand(command, namespace, yamlFileName, kubeconfig))
	return err
}
func KubeGetYaml(namespace, resource, name string, kubeconfig string) (string, error) {
	if namespace == "" {
		namespace = "default"
	}
	cmd := fmt.Sprintf("kubectl get %s %s -n %s -o yaml --kubeconfig=%s", resource, name, namespace, kubeconfig)
	return Shell(cmd)
}
func KubeApplyContentSilent(namespace, yamlContents string, kubeconfig string) error {
	tmpfile, err := WriteTempfile(os.TempDir(), "kubeapply", ".yaml", yamlContents)
	if err != nil {
		return err
	}
	defer removeFile(tmpfile)
	return KubeApplySilent(namespace, tmpfile, kubeconfig)
}
func KubeApplySilent(namespace, yamlFileName string, kubeconfig string) error {
	_, err := ShellSilent(kubeCommand("apply", namespace, yamlFileName, kubeconfig))
	return err
}
func KubeScale(namespace, typeName string, replicaCount int, kubeconfig string) error {
	kubecommand := fmt.Sprintf("kubectl scale -n %s --replicas=%d %s --kubeconfig=%s", namespace, replicaCount, typeName, kubeconfig)
	_, err := Shell(kubecommand)
	return err
}
func KubeDeleteContents(namespace, yamlContents string, kubeconfig string) error {
	tmpfile, err := WriteTempfile(os.TempDir(), "kubedelete", ".yaml", yamlContents)
	if err != nil {
		return err
	}
	defer removeFile(tmpfile)
	return KubeDelete(namespace, tmpfile, kubeconfig)
}
func removeFile(path string) {
	err := os.Remove(path)
	if err != nil {
		log.Errorf("Unable to remove %s: %v", path, err)
	}
}
func KubeDelete(namespace, yamlFileName string, kubeconfig string) error {
	_, err := Shell(kubeCommand("delete", namespace, yamlFileName, kubeconfig))
	return err
}
func GetKubeMasterIP(kubeconfig string) (string, error) {
	return ShellSilent("kubectl get svc kubernetes -n default -o jsonpath='{.spec.clusterIP}' --kubeconfig=%s", kubeconfig)
}
func GetClusterSubnet(kubeconfig string) (string, error) {
	cidr, err := ShellSilent("kubectl get nodes -o jsonpath='{.items[0].spec.podCIDR}' --kubeconfig=%s", kubeconfig)
	if err != nil {
		return "", err
	}
	parts := strings.Split(cidr, "/")
	if len(parts) != 2 {
		ip, _ := GetKubeMasterIP(kubeconfig)
		addr := net.ParseIP(ip)
		if addr == nil {
			return "", fmt.Errorf("unable to determine the kubernetes service IP and cluster subnet")
		}
		if addr.To4() != nil {
			log.Info("unable to identify cluster subnet. running on minikube?")
			return defaultClusterSubnet, nil
		}
		log.Info("unable to identify IPv6 cluster subnet")
		return defaultClusterSubnetv6, nil
	}
	return parts[1], nil
}
func getRetrier(serviceType string) Retrier {
	baseDelay := 1 * time.Second
	maxDelay := 1 * time.Second
	retries := 300  
	if serviceType == NodePortServiceType {
		baseDelay = 5 * time.Second
		maxDelay = 5 * time.Second
		retries = 20
	}
	return Retrier{
		BaseDelay: baseDelay,
		MaxDelay:  maxDelay,
		Retries:   retries,
	}
}
func GetServiceIP(serviceName, namespace, kubeconfig string) (string, error) {
	res, err := Shell("kubectl -n %s get svc %s -o go-template='{{$.spec.clusterIP}}' --kubeconfig=%s", namespace, serviceName, kubeconfig)
	return strings.TrimSpace(res), err
}
func GetIngress(serviceName, podLabel, namespace, kubeconfig string, serviceType string, sanityCheck bool) (string, error) {
	retry := getRetrier(serviceType)
	var ingress string
	retryFn := func(_ context.Context, i int) error {
		var err error
		if serviceType == NodePortServiceType {
			ingress, err = getServiceNodePort(serviceName, podLabel, namespace, kubeconfig)
		} else if serviceType == LoadBalancerServiceType {
			ingress, err = getServiceLoadBalancer(serviceName, namespace, kubeconfig)
		} else {
			return fmt.Errorf("unknown service type: %s", serviceType)
		}
		if err != nil {
			return err
		}
		log.Infof("Istio ingress: %s", ingress)
		return nil
	}
	ctx := context.Background()
	log.Infof("Waiting for %s to get external IP", serviceName)
	if _, err := retry.Retry(ctx, retryFn); err != nil {
		return "", err
	}
	ctx, cancel := context.WithTimeout(ctx, 300*time.Second)
	defer cancel()
	if !sanityCheck {
		return ingress, nil
	}
	client := &http.Client{Timeout: 5 * time.Second}
	ingressURL := fmt.Sprintf("http://%s", ingress)
	log.Infof("Sanity checking %v", ingressURL)
	for {
		select {
		case <-ctx.Done():
			return "", fmt.Errorf("%s readiness check timed out", serviceName)
		default:
			response, err := ctxhttp.Get(ctx, client, ingressURL)
			if err == nil {
				log.Infof("Response %v %q received from %v", response.StatusCode, response.Status, ingressURL)
				return ingress, nil
			}
		}
	}
}
func getServiceLoadBalancer(name, namespace, kubeconfig string) (string, error) {
	ip, err := ShellSilent(
		"kubectl get svc %s -n %s -o jsonpath='{.status.loadBalancer.ingress[*].ip}' --kubeconfig=%s",
		name, namespace, kubeconfig)
	if err != nil {
		return "", err
	}
	if ip == "" {
		ip, err = ShellSilent(
			"kubectl get svc %s -n %s -o jsonpath='{.status.loadBalancer.ingress[*].hostname}' --kubeconfig=%s",
			name, namespace, kubeconfig)
		if err != nil {
			return "", err
		}
		if ip == "localhost" {
			ip = "127.0.0.1"
		}
	}
	ip = strings.Trim(ip, "'")
	addr := net.ParseIP(ip)
	if addr == nil {
		return "", errors.New("ingress ip not available yet")
	}
	return ip, nil
}
func getServiceNodePort(serviceName, podLabel, namespace, kubeconfig string) (string, error) {
	ip, err := Shell(
		"kubectl get po -l istio=%s -n %s -o jsonpath='{.items[0].status.hostIP}' --kubeconfig=%s",
		podLabel, namespace, kubeconfig)
	if err != nil {
		return "", err
	}
	ip = strings.Trim(ip, "'")
	addr := net.ParseIP(ip)
	if addr == nil {
		return "", fmt.Errorf("the ip of %s is not available yet", serviceName)
	}
	port, err := getServicePort(serviceName, namespace, kubeconfig)
	if err != nil {
		return "", err
	}
	if addr.To4() == nil {
		return "[" + ip + "]" + ":" + port, nil
	}
	return ip + ":" + port, nil
}
func getServicePort(serviceName, namespace, kubeconfig string) (string, error) {
	port, err := Shell(
		"kubectl get svc %s -n %s -o jsonpath='{.spec.ports[?(@.port==%s)].nodePort}' --kubeconfig=%s",
		serviceName, namespace, ingressHTTPServicePort, kubeconfig)
	if err != nil {
		return "", err
	}
	port = strings.Trim(port, "'")
	rp := regexp.MustCompile(`^[0-9]{1,5}$`)
	if rp.FindString(port) == "" {
		err = fmt.Errorf("unable to find the port of %s", serviceName)
		log.Warna(err)
		return "", err
	}
	return port, nil
}
func GetIngressPodNames(n string, kubeconfig string) ([]string, error) {
	res, err := Shell("kubectl get pod -l istio=ingress -n %s -o jsonpath='{.items[*].metadata.name}' --kubeconfig=%s", n, kubeconfig)
	if err != nil {
		return nil, err
	}
	res = strings.Trim(res, "'")
	return strings.Split(res, " "), nil
}
func GetPodsInfo(n string, kubeconfig string, label string) (pods []PodInfo, err error) {
	res, err := Shell("kubectl -n %s -l=%s get pods -o=jsonpath='{range .items[*]}{.metadata.name}{\" \"}{.status.podIP}{\"\\n\"}{end}' --kubeconfig=%s", n, label, kubeconfig)
	if err != nil {
		log.Infof("Failed to get pods by label %s in namespace %s: %s", label, n, err)
		return nil, err
	}
	for _, line := range strings.Split(res, "\n") {
		f := strings.Fields(line)
		if len(f) >= 2 {
			pods = append(pods, PodInfo{
				Name:   f[0],
				IPAddr: f[1],
			})
		}
	}
	return pods, nil
}
func GetAppPodsInfo(n string, kubeconfig string, label string) ([]string, map[string][]string, error) {
	res, err := Shell("kubectl -n %s -l=%s get pods -o=jsonpath='{range .items[*]}{.metadata.name}{\" \"}{"+
		".metadata.labels.%s}{\" \"}{.status.podIP}{\"\\n\"}{end}' --kubeconfig=%s", n, label, label, kubeconfig)
	if err != nil {
		log.Infof("Failed to get pods by label %s in namespace %s: %s", label, n, err)
		return nil, nil, err
	}
	var podNames []string
	eps := make(map[string][]string)
	for _, line := range strings.Split(res, "\n") {
		f := strings.Fields(line)
		if len(f) >= 3 {
			podNames = append(podNames, f[0])
			eps[f[1]] = append(eps[f[1]], f[2])
		}
	}
	return podNames, eps, nil
}
func GetAppPods(n string, kubeconfig string) (map[string][]string, error) {
	podLabels, err := GetPodLabelValues(n, "app", kubeconfig)
	if err != nil {
		return nil, err
	}
	m := make(map[string][]string)
	for podName, app := range podLabels {
		m[app] = append(m[app], podName)
	}
	return m, nil
}
func IsJobSucceeded(n, name string, kubeconfig string) (bool, error) {
	succeed, err := Shell("kubectl -n %s get job  %s -o jsonpath='{.status.succeeded}' --kubeconfig=%s", n, name, kubeconfig)
	if err != nil {
		log.Warnf("could not get %s job: %v", name, err)
		return false, err
	}
	if len(succeed) != 0 {
		return true, nil
	}
	return false, nil
}
func GetPodLabelValues(n, label string, kubeconfig string) (map[string]string, error) {
	res, err := Shell("kubectl -n %s -l=%s get pods -o=jsonpath='{range .items[*]}{.metadata.name}{\" \"}{"+
		".metadata.labels.%s}{\"\\n\"}{end}' --kubeconfig=%s", n, label, label, kubeconfig)
	if err != nil {
		log.Infof("Failed to get pods by label %s in namespace %s: %s", label, n, err)
		return nil, err
	}
	m := make(map[string]string)
	for _, line := range strings.Split(res, "\n") {
		f := strings.Fields(line)
		if len(f) >= 2 {
			m[f[0]] = f[1]
		}
	}
	return m, nil
}
func GetPodNames(n string) (pods []string, kubeconfig string) {
	res, err := Shell("kubectl -n %s get pods -o jsonpath='{.items[*].metadata.name}' --kubeconfig=%s", n, kubeconfig)
	if err != nil {
		log.Infof("Failed to get pods name in namespace %s: %s", n, err)
		return
	}
	res = strings.Trim(res, "'")
	pods = strings.Split(res, " ")
	log.Infof("Existing pods: %v", pods)
	return
}
func GetPodStatus(n, pod string, kubeconfig string) string {
	status, err := Shell("kubectl -n %s get pods %s --no-headers --kubeconfig=%s", n, pod, kubeconfig)
	if err != nil {
		log.Infof("Failed to get status of pod %s in namespace %s: %s", pod, n, err)
		status = podFailedGet
	}
	f := strings.Fields(status)
	if len(f) > statusField {
		return f[statusField]
	}
	return ""
}
func GetPodName(n, labelSelector string, kubeconfig string) (pod string, err error) {
	pod, err = Shell("kubectl -n %s get pod -l %s -o jsonpath='{.items[0].metadata.name}' --kubeconfig=%s", n, labelSelector, kubeconfig)
	if err != nil {
		log.Warnf("could not get %s pod: %v", labelSelector, err)
		return
	}
	pod = strings.Trim(pod, "'")
	log.Infof("%s pod name: %s", labelSelector, pod)
	return
}
func GetPodLogsForLabel(n, labelSelector string, container string, tail, alsoShowPreviousPodLogs bool, kubeconfig string) string {
	pod, err := GetPodName(n, labelSelector, kubeconfig)
	if err != nil {
		return ""
	}
	return GetPodLogs(n, pod, container, tail, alsoShowPreviousPodLogs, kubeconfig)
}
func GetPodLogs(n, pod, container string, tail, alsoShowPreviousPodLogs bool, kubeconfig string) string {
	tailOption := ""
	if tail {
		tailOption = "--tail=40"
	}
	o1 := ""
	if alsoShowPreviousPodLogs {
		log.Info("Expect and ignore an error getting crash logs when there are no crash (-p invocation)")
		o1, _ = ShellMuteOutput("kubectl --namespace %s logs %s -c %s %s -p --kubeconfig=%s", n, pod, container, tailOption, kubeconfig)
		o1 += "\n"
	}
	o2, _ := ShellMuteOutput("kubectl --namespace %s logs %s -c %s %s --kubeconfig=%s", n, pod, container, tailOption, kubeconfig)
	return o1 + o2
}