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package immortalcontainer
import (
"context"
immortalcontainerv1alpha1 "github.com/flugel-it/k8s-go-operator-sdk-operator/pkg/apis/immortalcontainer/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"
"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_immortalcontainer")
// Add creates a new ImmortalContainer 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 &ReconcileImmortalContainer{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("immortalcontainer-controller", mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
// Watch for changes to primary resource ImmortalContainer
err = c.Watch(&source.Kind{Type: &immortalcontainerv1alpha1.ImmortalContainer{}}, &handler.EnqueueRequestForObject{})
if err != nil {
return err
}
// Watch for changes to secondary resource Pods and requeue the owner ImmortalContainer
err = c.Watch(&source.Kind{Type: &corev1.Pod{}}, &handler.EnqueueRequestForOwner{
IsController: true,
OwnerType: &immortalcontainerv1alpha1.ImmortalContainer{},
})
if err != nil {
return err
}
return nil
}
var _ reconcile.Reconciler = &ReconcileImmortalContainer{}
// ReconcileImmortalContainer reconciles a ImmortalContainer object
type ReconcileImmortalContainer 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 ImmortalContainer object and makes changes based on the state read
// and what is in the ImmortalContainer.Spec
// 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 *ReconcileImmortalContainer) Reconcile(request reconcile.Request) (reconcile.Result, error) {
reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
reqLogger.Info("Reconciling ImmortalContainer")
// Fetch the ImmortalContainer instance
instance := &immortalcontainerv1alpha1.ImmortalContainer{}
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 := newPodForImmortalContainer(instance)
// Set ImmortalContainer 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
}
instance.Status.CurrentPod = pod.Name
instance.Status.StartTimes++
reqLogger.Info("Updating status", instance.Namespace, "/", instance.Name)
err := r.client.Status().Update(context.TODO(), instance)
if err != nil {
reqLogger.Error(err, "Failed to update ImmortalContainer status.")
return reconcile.Result{}, err
}
// Pod created successfully - don't requeue
return reconcile.Result{}, nil
} else if err != nil {
return reconcile.Result{}, err
}
// Pod already exists - don't requeue
reqLogger.Info("Skip reconcile: Pod already exists", "Pod.Namespace", found.Namespace, "Pod.Name", found.Name)
return reconcile.Result{}, nil
}
func newPodForImmortalContainer(cr *immortalcontainerv1alpha1.ImmortalContainer) *corev1.Pod {
labels := map[string]string{
"app": cr.Name,
}
return &corev1.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: cr.Name + "-immortalpod",
Namespace: cr.Namespace,
Labels: labels,
},
Spec: corev1.PodSpec{
Containers: []corev1.Container{
{
Name: "acontainer",
Image: cr.Spec.Image,
},
},
},
}
}
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