forked from operator-framework/operator-sdk
/
memcachedrs_controller.go
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/
memcachedrs_controller.go
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// Copyright 2019 The Operator-SDK Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package memcachedrs
import (
"context"
"reflect"
cachev1alpha1 "github.com/operator-framework/operator-sdk/test/test-framework/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_memcachedrs")
/**
* 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 MemcachedRS 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 &ReconcileMemcachedRS{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("memcachedrs-controller", mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
// Watch for changes to primary resource MemcachedRS
err = c.Watch(&source.Kind{Type: &cachev1alpha1.MemcachedRS{}}, &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 MemcachedRS
err = c.Watch(&source.Kind{Type: &appsv1.ReplicaSet{}}, &handler.EnqueueRequestForOwner{
IsController: true,
OwnerType: &cachev1alpha1.MemcachedRS{},
})
if err != nil {
return err
}
return nil
}
// blank assignment to verify that ReconcileMemcachedRS implements reconcile.Reconciler
var _ reconcile.Reconciler = &ReconcileMemcachedRS{}
// ReconcileMemcachedRS reconciles a MemcachedRS object
type ReconcileMemcachedRS 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 MemcachedRS object and makes changes based on the state read
// and what is in the MemcachedRS.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 *ReconcileMemcachedRS) Reconcile(request reconcile.Request) (reconcile.Result, error) {
reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
reqLogger.Info("Reconciling MemcachedRS")
// Fetch the MemcachedRS instance
memcachedrs := &cachev1alpha1.MemcachedRS{}
err := r.client.Get(context.TODO(), request.NamespacedName, memcachedrs)
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
}
// Check if the replicaSet already exists, if not create a new one
found := &appsv1.ReplicaSet{}
err = r.client.Get(context.TODO(), types.NamespacedName{Name: memcachedrs.Name, Namespace: memcachedrs.Namespace}, found)
if err != nil && errors.IsNotFound(err) {
// Define a new replicaSet
dep := r.replicaSetForMemcached(memcachedrs)
reqLogger.Info("Creating a new ReplicaSet", "ReplicaSet.Namespace", dep.Namespace, "ReplicaSet.Name", dep.Name)
err = r.client.Create(context.TODO(), dep)
if err != nil {
reqLogger.Error(err, "Failed to create new ReplicaSet", "ReplicaSet.Namespace", dep.Namespace, "ReplicaSet.Name", dep.Name)
return reconcile.Result{}, err
}
// ReplicaSet created successfully - return and requeue
return reconcile.Result{Requeue: true}, nil
} else if err != nil {
reqLogger.Error(err, "Failed to get ReplicaSet")
return reconcile.Result{}, err
}
// Ensure the replicaSet size is the same as the spec
size := memcachedrs.Spec.NumNodes
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 ReplicaSet", "ReplicaSet.Namespace", found.Namespace, "ReplicaSet.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 replicaSet
podList := &corev1.PodList{}
labelSelector := labels.SelectorFromSet(labelsForMemcached(memcachedrs.Name))
listOps := &client.ListOptions{Namespace: memcachedrs.Namespace, LabelSelector: labelSelector}
err = r.client.List(context.TODO(), listOps, podList)
if err != nil {
reqLogger.Error(err, "Failed to list pods", "Memcached.Namespace", memcachedrs.Namespace, "Memcached.Name", memcachedrs.Name)
return reconcile.Result{}, err
}
podNames := getPodNames(podList.Items)
// Update status.Nodes if needed
if !reflect.DeepEqual(podNames, memcachedrs.Status.NodeList) {
memcachedrs.Status.NodeList = podNames
err := r.client.Status().Update(context.TODO(), memcachedrs)
if err != nil {
reqLogger.Error(err, "Failed to update Memcached status")
return reconcile.Result{}, err
}
}
// Switch testing bool
if memcachedrs.Status.Test {
memcachedrs.Status.Test = false
} else {
memcachedrs.Status.Test = true
}
err = r.client.Status().Update(context.TODO(), memcachedrs)
if err != nil {
reqLogger.Error(err, "Failed to update Memcached status")
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
// rsForMemcached returns a memcached ReplicaSet object
func (r *ReconcileMemcachedRS) replicaSetForMemcached(m *cachev1alpha1.MemcachedRS) *appsv1.ReplicaSet {
ls := labelsForMemcached(m.Name)
replicas := m.Spec.NumNodes
replicaSet := &appsv1.ReplicaSet{
TypeMeta: metav1.TypeMeta{
APIVersion: "apps/v1",
Kind: "ReplicaSet",
},
ObjectMeta: metav1.ObjectMeta{
Name: m.Name,
Namespace: m.Namespace,
},
Spec: appsv1.ReplicaSetSpec{
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, replicaSet, r.scheme)
return replicaSet
}
// 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-rs", "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
}