package main

import (
	"context"
	"flag"
	"log"
	"path/filepath"

	"k8s.io/client-go/informers"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/tools/cache"
	"k8s.io/client-go/tools/clientcmd"
	"k8s.io/client-go/util/homedir"
)

func main() {
	var kubeconfig string

	flag.StringVar(&kubeconfig, "kubeconfig", filepath.Join(homedir.HomeDir(), ".kube", "config"), "(optional) absolute path to the kubeconfig file")
	flag.Parse()
	// use the current context in kubeconfig
	config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
	if err != nil {
		log.Fatal(err)
	}

	ctx := context.Background()

	AddPod := func(obj interface{}) {

	}
	DeletePod := func(obj interface{}) {

	}
	UpdatePod := func(oldObj, newObj interface{}) {

	}

	clientset := kubernetes.NewForConfigOrDie(config)
	// 基于GVK 操作资源，假设需要操作数十种不同资源时，我们需要为每一种资源实现各自的函数
	podInformer := informers.NewSharedInformerFactory(clientset, 0).
		Core().V1().Pods().Informer()
	podInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
		AddFunc:    AddPod,
		DeleteFunc: DeletePod,
		UpdateFunc: UpdatePod,
	})
	// 启动informer
	podInformer.Run(ctx.Done())
	cache.WaitForCacheSync(ctx.Done(), podInformer.HasSynced)
	// 此处没有使用workqueue，但一般都是会用workqueue 增强处理逻辑的
}