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/*

Copyright 2018 The Kubernetes 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 controllerruntime_test

import (

"context"

"fmt"

"os"

appsv1 "k8s.io/api/apps/v1"

corev1 "k8s.io/api/core/v1"

controllers "sigs.k8s.io/controller-runtime"

"sigs.k8s.io/controller-runtime/pkg/client"

)

// This example creates a simple application Controller that is configured for ReplicaSets and Pods.

//

// * Create a new application for ReplicaSets that manages Pods owned by the ReplicaSet and calls into

// ReplicaSetReconciler.

//

// * Start the application.

// TODO(pwittrock): Update this example when we have better dependency injection support

func Example() {

var log = controllers.Log.WithName("builder-examples")

manager, err := controllers.NewManager(controllers.GetConfigOrDie(), controllers.Options{})

if err != nil {

log.Error(err, "could not create manager")

os.Exit(1)

}

err = controllers.

NewControllerManagedBy(manager). // Create the Controller

For(&appsv1.ReplicaSet{}). // ReplicaSet is the Application API

Owns(&corev1.Pod{}). // ReplicaSet owns Pods created by it

Complete(&ReplicaSetReconciler{Client: manager.GetClient()})

if err != nil {

log.Error(err, "could not create controller")

os.Exit(1)

}

if err := manager.Start(controllers.SetupSignalHandler()); err != nil {

log.Error(err, "could not start manager")

os.Exit(1)

}

}

// ReplicaSetReconciler is a simple Controller example implementation.

type ReplicaSetReconciler struct {

client.Client

}

// Implement the business logic:

// This function will be called when there is a change to a ReplicaSet or a Pod with an OwnerReference

// to a ReplicaSet.

//

// * Read the ReplicaSet

// * Read the Pods

// * Set a Label on the ReplicaSet with the Pod count

func (a *ReplicaSetReconciler) Reconcile(req controllers.Request) (controllers.Result, error) {

// Read the ReplicaSet

rs := &appsv1.ReplicaSet{}

err := a.Get(context.TODO(), req.NamespacedName, rs)

if err != nil {

return controllers.Result{}, err

}

// List the Pods matching the PodTemplate Labels

pods := &corev1.PodList{}

err = a.List(context.TODO(), pods, client.InNamespace(req.Namespace), client.MatchingLabels(rs.Spec.Template.Labels))

if err != nil {

return controllers.Result{}, err

}

// Update the ReplicaSet

rs.Labels["pod-count"] = fmt.Sprintf("%v", len(pods.Items))

err = a.Update(context.TODO(), rs)

if err != nil {

return controllers.Result{}, err

}

return controllers.Result{}, nil

}