controller.go

gistfile1.txt

package kubewatch

import (
	"context"
	"reflect"

	noironetworksv1 "github.com/gaurav-dalvi/kubewatch/pkg/apis/noironetworks/v1"

	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/controller"
	"sigs.k8s.io/controller-runtime/pkg/handler"
	"sigs.k8s.io/controller-runtime/pkg/manager"
	"sigs.k8s.io/controller-runtime/pkg/reconcile"
	logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
	"sigs.k8s.io/controller-runtime/pkg/source"
)

var log = logf.Log.WithName("controller_kubewatch")

/**
* USER ACTION REQUIRED: This is a scaffold file intended for the user to modify with their own Controller
* business logic.  Delete these comments after modifying this file.*
 */

// Add creates a new Kubewatch Controller and adds it to the Manager. The Manager will set fields on the Controller
// and Start it when the Manager is Started.
func Add(mgr manager.Manager) error {
	return add(mgr, newReconciler(mgr))
}

// newReconciler returns a new reconcile.Reconciler
func newReconciler(mgr manager.Manager) reconcile.Reconciler {
	return &ReconcileKubewatch{client: mgr.GetClient(), scheme: mgr.GetScheme()}
}

// add adds a new Controller to mgr with r as the reconcile.Reconciler
func add(mgr manager.Manager, r reconcile.Reconciler) error {
	// Create a new controller
	c, err := controller.New("kubewatch-controller", mgr, controller.Options{Reconciler: r})
	if err != nil {
		return err
	}

	// Watch for changes to primary resource Kubewatch
	err = c.Watch(&source.Kind{Type: &noironetworksv1.Kubewatch{}}, &handler.EnqueueRequestForObject{})
	if err != nil {
		return err
	}

	// TODO(user): Modify this to be the types you create that are owned by the primary resource
	// Watch for changes to secondary resource Pods and requeue the owner Kubewatch
	err = c.Watch(&source.Kind{Type: &corev1.Pod{}}, &handler.EnqueueRequestForObject{})
	if err != nil {
		return err
	}

	return nil
}

var _ reconcile.Reconciler = &ReconcileKubewatch{}

// ReconcileKubewatch reconciles a Kubewatch object
type ReconcileKubewatch struct {
	// This client, initialized using mgr.Client() above, is a split client
	// that reads objects from the cache and writes to the apiserver
	client client.Client
	scheme *runtime.Scheme
}

// Reconcile reads that state of the cluster for a Kubewatch object and makes changes based on the state read
// and what is in the Kubewatch.Spec
// TODO(user): Modify this Reconcile function to implement your Controller logic.  This example creates
// a Pod as an example
// Note:
// The Controller will requeue the Request to be processed again if the returned error is non-nil or
// Result.Requeue is true, otherwise upon completion it will remove the work from the queue.
func (r *ReconcileKubewatch) Reconcile(request reconcile.Request) (reconcile.Result, error) {
	reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
	reqLogger.Info("Reconciling Kubewatch")

	// Fetch the Kubewatch instance
	instance := &noironetworksv1.Kubewatch{}
	err := r.client.Get(context.TODO(), request.NamespacedName, instance)
	if err != nil {
		if errors.IsNotFound(err) {
			// Request object not found, could have been deleted after reconcile request.
			// Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
			// Return and don't requeue
			return reconcile.Result{}, nil
		}
		// Error reading the object - requeue the request.
		return reconcile.Result{}, err
	}

	// // Define a new Pod object
	// pod := newPodForCR(instance)

	// // Set Kubewatch instance as the owner and controller
	// if err := controllerutil.SetControllerReference(instance, pod, r.scheme); err != nil {
	// 	return reconcile.Result{}, err
	// }

	// // Check if this Pod already exists
	// found := &corev1.Pod{}
	// err = r.client.Get(context.TODO(), types.NamespacedName{Name: pod.Name, Namespace: pod.Namespace}, found)
	// if err != nil && errors.IsNotFound(err) {
	// 	reqLogger.Info("Creating a new Pod", "Pod.Namespace", pod.Namespace, "Pod.Name", pod.Name)
	// 	err = r.client.Create(context.TODO(), pod)
	// 	if err != nil {
	// 		return reconcile.Result{}, err
	// 	}

	// 	// Pod created successfully - don't requeue
	// 	return reconcile.Result{}, nil
	// } else if err != nil {
	// 	return reconcile.Result{}, err
	// }
	// Update the status if necessary
	status := noironetworksv1.KubewatchStatus{
		Name: request.Name,
	}
	if !reflect.DeepEqual(instance.Status, status) {
		instance.Status = status
		err := r.client.Update(context.TODO(), instance)
		if err != nil {
			reqLogger.Error(err, "failed to update the kubewatch instance")
			return reconcile.Result{}, err
		}
		reqLogger.Info("Inside Upate status", "Pod.Namespace", request.Namespace, "Pod.Name", request.Name)
	}

	// Pod already exists - don't requeue
	reqLogger.Info("Skip reconcile: Pod already exists", "Pod.Namespace", request.Namespace, "Pod.Name", request.Name)
	return reconcile.Result{}, nil
}

// // newPodForCR returns a busybox pod with the same name/namespace as the cr
// func newPodForCR(cr *noironetworksv1.Kubewatch) *corev1.Pod {
// 	labels := map[string]string{
// 		"app": cr.Name,
// 	}
// 	return &corev1.Pod{
// 		ObjectMeta: metav1.ObjectMeta{
// 			Name:      cr.Name + "-pod",
// 			Namespace: cr.Namespace,
// 			Labels:    labels,
// 		},
// 		Spec: corev1.PodSpec{
// 			Containers: []corev1.Container{
// 				{
// 					Name:    "busybox",
// 					Image:   "busybox",
// 					Command: []string{"sleep", "3600"},
// 				},
// 			},
// 		},
// 	}
// }