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package memcached
import (
"context"
"reflect"
cachev1alpha1 "github.com/example-inc/memcached-operator-long/pkg/apis/cache/v1alpha1"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"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_memcached")
/**
* 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 Memcached 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 &ReconcileMemcached{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("memcached-controller", mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
// Watch for changes to primary resource Memcached
err = c.Watch(&source.Kind{Type: &cachev1alpha1.Memcached{}}, &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 Memcached
err = c.Watch(&source.Kind{Type: &appsv1.Deployment{}}, &handler.EnqueueRequestForOwner{
IsController: true,
OwnerType: &cachev1alpha1.Memcached{},
})
if err != nil {
return err
}
return nil
}
var _ reconcile.Reconciler = &ReconcileMemcached{}
// ReconcileMemcached reconciles a Memcached object
type ReconcileMemcached struct {
// TODO: Clarify the split client
// 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 Memcached object and makes changes based on the state read
// and what is in the Memcached.Spec
// TODO(user): Modify this Reconcile function to implement your Controller logic. This example creates
// a Memcached Deployment for each Memcached CR
// 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 *ReconcileMemcached) Reconcile(request reconcile.Request) (reconcile.Result, error) {
reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
reqLogger.Info("Reconciling Memcached")
// Fetch the Memcached instance
memcached := &cachev1alpha1.Memcached{}
err := r.client.Get(context.TODO(), request.NamespacedName, memcached)
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
reqLogger.Info("Memcached resource not found. Ignoring since object must be deleted")
return reconcile.Result{}, nil
}
// Error reading the object - requeue the request.
reqLogger.Error(err, "Failed to get Memcached")
return reconcile.Result{}, err
}
// Check if the deployment already exists, if not create a new one
found := &appsv1.Deployment{}
err = r.client.Get(context.TODO(), types.NamespacedName{Name: memcached.Name, Namespace: memcached.Namespace}, found)
if err != nil && errors.IsNotFound(err) {
// Define a new deployment
dep := r.deploymentForMemcached(memcached)
reqLogger.Info("Creating a new Deployment", "Deployment.Namespace", dep.Namespace, "Deployment.Name", dep.Name)
err = r.client.Create(context.TODO(), dep)
if err != nil {
reqLogger.Error(err, "Failed to create new Deployment", "Deployment.Namespace", dep.Namespace, "Deployment.Name", dep.Name)
return reconcile.Result{}, err
}
// Deployment created successfully - return and requeue
return reconcile.Result{Requeue: true}, nil
} else if err != nil {
reqLogger.Error(err, "Failed to get Deployment")
return reconcile.Result{}, err
}
// Ensure the deployment size is the same as the spec
size := memcached.Spec.Size
if *found.Spec.Replicas != size {
found.Spec.Replicas = &size
err = r.client.Update(context.TODO(), found)
if err != nil {
reqLogger.Error(err, "Failed to update Deployment", "Deployment.Namespace", found.Namespace, "Deployment.Name", found.Name)
return reconcile.Result{}, err
}
// Spec updated - return and requeue
return reconcile.Result{Requeue: true}, nil
}
// Update the Memcached status with the pod names
// List the pods for this memcached's deployment
podList := &corev1.PodList{}
labelSelector := labels.SelectorFromSet(labelsForMemcached(memcached.Name))
listOps := &client.ListOptions{Namespace: memcached.Namespace, LabelSelector: labelSelector}
err = r.client.List(context.TODO(), listOps, podList)
if err != nil {
reqLogger.Error(err, "Failed to list pods", "Memcached.Namespace", memcached.Namespace, "Memcached.Name", memcached.Name)
return reconcile.Result{}, err
}
podNames := getPodNames(podList.Items)
// Update status.Nodes if needed
if !reflect.DeepEqual(podNames, memcached.Status.Nodes) {
memcached.Status.Nodes = podNames
err := r.client.Status().Update(context.TODO(), memcached)
if err != nil {
reqLogger.Error(err, "Failed to update Memcached status")
return reconcile.Result{}, err
}
}
return reconcile.Result{}, nil
}
// deploymentForMemcached returns a memcached Deployment object
func (r *ReconcileMemcached) deploymentForMemcached(m *cachev1alpha1.Memcached) *appsv1.Deployment {
ls := labelsForMemcached(m.Name)
replicas := m.Spec.Size
dep := &appsv1.Deployment{
TypeMeta: metav1.TypeMeta{
APIVersion: "apps/v1",
Kind: "Deployment",
},
ObjectMeta: metav1.ObjectMeta{
Name: m.Name,
Namespace: m.Namespace,
},
Spec: appsv1.DeploymentSpec{
Replicas: &replicas,
Selector: &metav1.LabelSelector{
MatchLabels: ls,
},
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: ls,
},
Spec: corev1.PodSpec{
Containers: []corev1.Container{{
Image: "memcached:1.4.36-alpine",
Name: "memcached",
Command: []string{"memcached", "-m=64", "-o", "modern", "-v"},
Ports: []corev1.ContainerPort{{
ContainerPort: 11211,
Name: "memcached",
}},
}},
},
},
},
}
// Set Memcached instance as the owner and controller
controllerutil.SetControllerReference(m, dep, r.scheme)
return dep
}
// labelsForMemcached returns the labels for selecting the resources
// belonging to the given memcached CR name.
func labelsForMemcached(name string) map[string]string {
return map[string]string{"app": "memcached", "memcached_cr": name}
}
// getPodNames returns the pod names of the array of pods passed in
func getPodNames(pods []corev1.Pod) []string {
var podNames []string
for _, pod := range pods {
podNames = append(podNames, pod.Name)
}
return podNames
}
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