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ochacafe_controller.go
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/
ochacafe_controller.go
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/*
Copyright 2022.
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 controllers
import (
"context"
"reflect"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
ctrllog "sigs.k8s.io/controller-runtime/pkg/log"
ochacafev1alpha1 "github.com/oracle-japan/ochacafe-operator-intro/api/v1alpha1"
)
// OchacafeReconciler reconciles a Ochacafe object
type OchacafeReconciler struct {
client.Client
Scheme *runtime.Scheme
}
//+kubebuilder:rbac:groups=ochacafe.oracle.com,resources=ochacaves,verbs=get;list;watch;create;update;patch;delete
//+kubebuilder:rbac:groups=ochacafe.oracle.com,resources=ochacaves/status,verbs=get;update;patch
//+kubebuilder:rbac:groups=ochacafe.oracle.com,resources=ochacaves/finalizers,verbs=update
//+kubebuilder:rbac:groups=apps,resources=deployments,verbs=get;list;watch;create;update;patch;delete
//+kubebuilder:rbac:groups=core,resources=pods,verbs=get;list;watch
// Reconcile is part of the main kubernetes reconciliation loop which aims to
// move the current state of the cluster closer to the desired state.
// TODO(user): Modify the Reconcile function to compare the state specified by
// the Ochacafe object against the actual cluster state, and then
// perform operations to make the cluster state reflect the state specified by
// the user.
//
// For more details, check Reconcile and its Result here:
// - https://pkg.go.dev/sigs.k8s.io/controller-runtime@v0.10.0/pkg/reconcile
func (r *OchacafeReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := ctrllog.FromContext(ctx)
// 1. Fetch the Ochacafe instance
ochacafe := &ochacafev1alpha1.Ochacafe{}
err := r.Get(ctx, req.NamespacedName, ochacafe)
if err != nil {
if errors.IsNotFound(err) {
log.Info("1. Fetch the Ochacafe instance. Ochacafe resource not found. Ignoring since object must be deleted")
return ctrl.Result{}, err
}
// Error reading the object - requeue the request.
log.Error(err, "1. Fetch the Ochacafe instance. Failed to get Ochacafe")
return ctrl.Result{}, err
}
log.Info("1. Fetch the Ochacafe instance. Ochacafe resource found", "Ochacafe.Name", ochacafe.Name, "Ochacafe.Namespace", ochacafe.Namespace)
// 2. Check if the deployment already exists, if not create a new one
found := &appsv1.Deployment{}
err = r.Get(ctx, types.NamespacedName{Name: ochacafe.Name, Namespace: ochacafe.Namespace}, found)
if err != nil && errors.IsNotFound(err) {
// Define a new deployment
dep := r.deploymentForOcha(ochacafe)
log.Info("2. Check if the deployment already exists, if not create a new one. Creating a new Deployment", "Deployment.Namespace", dep.Namespace, "Deployment.Name", dep.Name)
err = r.Create(ctx, dep)
if err != nil {
log.Error(err, "2. Check if the deployment already exists, if not create a new one. Failed to create new Deployment", "Deployment.Namespace", dep.Namespace, "Deployment.Name", dep.Name)
return ctrl.Result{}, err
}
// Deployment created successfully - return and requeue
return ctrl.Result{Requeue: true}, nil
} else if err != nil {
log.Error(err, "2. Check if the deployment already exists, if not create a new one. Failed to get Deployment")
return ctrl.Result{}, err
}
// 3. Ensure the deployment size is the same as the spec
size := ochacafe.Spec.Size
if *found.Spec.Replicas != size {
found.Spec.Replicas = &size
err = r.Update(ctx, found)
if err != nil {
log.Error(err, "3. Ensure the deployment size is the same as the spec. Failed to update Deployment", "Deployment.Namespace", found.Namespace, "Deployment.Name", found.Name)
return ctrl.Result{}, err
}
// Spec updated - return and requeue
log.Info("3. Ensure the deployment size is the same as the spec. Update deployment size", "Deployment.Spec.Replicas", size)
return ctrl.Result{Requeue: true}, nil
}
// 4. Update the ochacafe status with the pod names
// List the pods for this ochacafe's deployment
podList := &corev1.PodList{}
listOpts := []client.ListOption{
client.InNamespace(ochacafe.Namespace),
client.MatchingLabels(labelsForOcha(ochacafe.Name)),
}
if err = r.List(ctx, podList, listOpts...); err != nil {
log.Error(err, "4. Update the Ochacafe status with the pod names. Failed to list pods", "Ochacafe.Namespace", ochacafe.Namespace, "Ochacafe.Name", ochacafe.Name)
return ctrl.Result{}, err
}
podNames := getPodNames(podList.Items)
log.Info("4. Update the Ochacafe status with the pod names. Pod list", "podNames", podNames)
// Update status.Nodes if needed
if !reflect.DeepEqual(podNames, ochacafe.Status.Nodes) {
ochacafe.Status.Nodes = podNames
err := r.Status().Update(ctx, ochacafe)
if err != nil {
log.Error(err, "4. Update the Ochacafe status with the pod names. Failed to update Ochacafe status")
return ctrl.Result{}, err
}
}
log.Info("4. Update the Ochacafe status with the pod names. Update Ochacafe.Status", "Ochacafe.Status.Nodes", ochacafe.Status.Nodes)
return ctrl.Result{}, nil
}
// deploymentForOcha returns a something Deployment object
func (r *OchacafeReconciler) deploymentForOcha(m *ochacafev1alpha1.Ochacafe) *appsv1.Deployment {
ls := labelsForOcha(m.Name)
replicas := m.Spec.Size
image := m.Spec.Image
dep := &appsv1.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: image,
Name: "ochacafe-app",
Ports: []corev1.ContainerPort{{
ContainerPort: 80,
}},
}},
},
},
},
}
// Set Ochacafe instance as the owner and controller
ctrl.SetControllerReference(m, dep, r.Scheme)
return dep
}
func labelsForOcha(name string) map[string]string {
return map[string]string{"app": "ochacafe", "ochacafe_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
}
// SetupWithManager sets up the controller with the Manager.
func (r *OchacafeReconciler) SetupWithManager(mgr ctrl.Manager) error {
return ctrl.NewControllerManagedBy(mgr).
For(&ochacafev1alpha1.Ochacafe{}).
Owns(&appsv1.Deployment{}).
Complete(r)
}