Pulling out kubernetes services with the first port in Go

services.go

package main

import (
  "flag"
  "fmt"
  "os"
  "path/filepath"

  "k8s.io/client-go/tools/clientcmd"
  "k8s.io/client-go/kubernetes"
  metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

func main() {
  var kubeconfig *string

  if home := homeDir(); home != "" {
		kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
	} else {
		kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
	}
  flag.Parse()

  config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
  if err != nil {
  	panic(err.Error())
  }

  clientset, err := kubernetes.NewForConfig(config)
  if err != nil {
		panic(err.Error())
  }

  services, err := clientset.CoreV1().Services("").List(metav1.ListOptions{})
	if err != nil {
		panic(err.Error())
	}
  fmt.Printf("There are %d services in the cluster\n", len(services.Items))

  for _, s := range services.Items {
		fmt.Printf(" -- Service name %s with port %d\n",s.Name, s.Spec.Ports[0].Port)
  }
}


func homeDir() string {
	if h := os.Getenv("HOME"); h != "" {
		return h
	}
	return os.Getenv("USERPROFILE") // windows
}