update demo

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

tests/ctrl/main.go

@@ -0,0 +1,62 @@
+package tests
+
+import (
+	"context"
+	"os"
+
+	appsv1 "k8s.io/api/apps/v1"
+	corev1 "k8s.io/api/core/v1"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/client/config"
+	"sigs.k8s.io/controller-runtime/pkg/handler"
+	"sigs.k8s.io/controller-runtime/pkg/source"
+)
+
+type podReconcile struct {
+	client.Client
+}
+
+func (r *podReconcile) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
+	rs := &appsv1.ReplicaSet{}
+	err := r.Get(ctx, req.NamespacedName, rs)
+	if err != nil {
+		return ctrl.Result{}, err
+	}
+	// DoSometing
+	return ctrl.Result{}, nil
+}
+
+func (r *podReconcile) InjectClient(c client.Client) error {
+	r.Client = c
+	return nil
+}
+
+func main() {
+	log := ctrl.Log.WithName("entrypoint")
+
+	// 初始化 manager，同时生成一个默认配置的 Cache
+	mgr, err := ctrl.NewManager(config.GetConfigOrDie(), ctrl.Options{})
+	if err != nil {
+		log.Error(err, "unable to set up overall controller manager")
+	}
+	// 注册 scheme
+	if err = corev1.AddToScheme(mgr.GetScheme()); err != nil {
+		log.Error(err, "unable to add scheme")
+	}
+
+	// 创建新的 controller
+	err = ctrl.NewControllerManagedBy(mgr).For(&appsv1.ReplicaSet{}).
+		// 当 Pod 变更时，也触发 ReplicaSet
+		Watches(&source.Kind{Type: &corev1.Pod{}}, &handler.EnqueueRequestForObject{}).
+		Complete(&podReconcile{})
+	if err != nil {
+		log.Error(err, "unable to add controller")
+	}
+
+	// 启动 manager
+	if err = mgr.Start(ctrl.SetupSignalHandler()); err != nil {
+		log.Error(err, "unable to run manager")
+		os.Exit(1)
+	}
+}