update demo

Signed-off-by: dragonflylee <dragonflylee@outlook.com>

tests/informer/informer.go

@@ -0,0 +1,52 @@
+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
+}