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package presentation
import (
"context"
presentationv1alpha1 "github.com/NautiluX/presentation-example-operator/pkg/apis/presentation/v1alpha1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/handler"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
)
var log = logf.Log.WithName("controller_presentation")
/**
* 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 Presentation 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 &ReconcilePresentation{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("presentation-controller", mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
// Watch for changes to primary resource Presentation
err = c.Watch(&source.Kind{Type: &presentationv1alpha1.Presentation{}}, &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 Presentation
err = c.Watch(&source.Kind{Type: &corev1.Pod{}}, &handler.EnqueueRequestForOwner{
IsController: true,
OwnerType: &presentationv1alpha1.Presentation{},
})
if err != nil {
return err
}
return nil
}
// blank assignment to verify that ReconcilePresentation implements reconcile.Reconciler
var _ reconcile.Reconciler = &ReconcilePresentation{}
// ReconcilePresentation reconciles a Presentation object
type ReconcilePresentation 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 Presentation object and makes changes based on the state read
// and what is in the Presentation.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 *ReconcilePresentation) Reconcile(request reconcile.Request) (reconcile.Result, error) {
reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
reqLogger.Info("Reconciling Presentation")
// Fetch the Presentation instance
instance := &presentationv1alpha1.Presentation{}
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
}
configMapChanged, err := r.ensureLatestConfigMap(instance)
if err != nil {
return reconcile.Result{}, err
}
err = r.ensureLatestPod(instance, configMapChanged)
if err != nil {
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
func (r *ReconcilePresentation) ensureLatestConfigMap(instance *presentationv1alpha1.Presentation) (bool, error) {
configMap := newConfigMap(instance)
// Set Presentation instance as the owner and controller
if err := controllerutil.SetControllerReference(instance, configMap, r.scheme); err != nil {
return false, err
}
// Check if this ConfigMap already exists
foundMap := &corev1.ConfigMap{}
err := r.client.Get(context.TODO(), types.NamespacedName{Name: configMap.Name, Namespace: configMap.Namespace}, foundMap)
if err != nil && errors.IsNotFound(err) {
err = r.client.Create(context.TODO(), configMap)
if err != nil {
return false, err
}
} else if err != nil {
return false, err
}
if foundMap.Data["slides.md"] != configMap.Data["slides.md"] {
err = r.client.Update(context.TODO(), configMap)
if err != nil {
return false, err
}
return true, nil
}
return false, nil
}
func (r *ReconcilePresentation) ensureLatestPod(instance *presentationv1alpha1.Presentation, configMapChanged bool) error {
// Define a new Pod object
pod := newPodForCR(instance)
// Set Presentation instance as the owner and controller
if err := controllerutil.SetControllerReference(instance, pod, r.scheme); err != nil {
return 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) {
err = r.client.Create(context.TODO(), pod)
if err != nil {
return err
}
// Pod created successfully - don't requeue
return nil
} else if err != nil {
return err
}
if configMapChanged {
err = r.client.Delete(context.TODO(), found)
if err != nil {
return err
}
err = r.client.Create(context.TODO(), pod)
if err != nil {
return err
}
}
return nil
}
func newConfigMap(cr *presentationv1alpha1.Presentation) *corev1.ConfigMap {
labels := map[string]string{
"app": cr.Name,
}
return &corev1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Name: cr.Name + "-config",
Namespace: cr.Namespace,
Labels: labels,
},
Data: map[string]string{
"slides.md": cr.Spec.Markdown,
},
}
}
// newPodForCR returns a busybox pod with the same name/namespace as the cr
func newPodForCR(cr *presentationv1alpha1.Presentation) *corev1.Pod {
labels := map[string]string{
"app": cr.Name,
}
volumeName := cr.Name + "-config"
return &corev1.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: cr.Name + "-pod",
Namespace: cr.Namespace,
Labels: labels,
},
Spec: corev1.PodSpec{
Containers: []corev1.Container{
{
Name: "slides",
Image: "manueldewald/presentation",
VolumeMounts: []corev1.VolumeMount{
{
Name: volumeName,
MountPath: "/config",
},
},
},
},
Volumes: []corev1.Volume{
{
Name: volumeName,
VolumeSource: corev1.VolumeSource{
ConfigMap: &corev1.ConfigMapVolumeSource{
LocalObjectReference: corev1.LocalObjectReference{
Name: cr.Name + "-config",
},
},
},
},
},
},
}
}
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