pkg/controller/broker/broker_controller.go - rocketmq-operator - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You 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 broker

 import (
 	"context"
 	"reflect"
 	"strconv"
 	"strings"
 	"time"

 	rocketmqv1alpha1 "github.com/apache/rocketmq-operator/pkg/apis/rocketmq/v1alpha1"
 	cons "github.com/apache/rocketmq-operator/pkg/constants"
 	"github.com/apache/rocketmq-operator/pkg/share"
 	"github.com/apache/rocketmq-operator/pkg/tool"
 	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_broker")
 var isInitial = true
 var cmd = []string{"/bin/bash", "-c", "echo Initial broker"}

 /**
 * 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 Broker 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 &ReconcileBroker{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("broker-controller", mgr, controller.Options{Reconciler: r})
 	if err != nil {
 		return err
 	}

 	// Watch for changes to primary resource Broker
 	err = c.Watch(&source.Kind{Type: &rocketmqv1alpha1.Broker{}}, &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 Broker
 	err = c.Watch(&source.Kind{Type: &corev1.Pod{}}, &handler.EnqueueRequestForOwner{
 		IsController: true,
 		OwnerType:    &rocketmqv1alpha1.Broker{},
 	})
 	if err != nil {
 		return err
 	}

 	return nil
 }

 // blank assignment to verify that ReconcileBroker implements reconcile.Reconciler
 var _ reconcile.Reconciler = &ReconcileBroker{}

 // ReconcileBroker reconciles a Broker object
 type ReconcileBroker 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 Broker object and makes changes based on the state read
 // and what is in the Broker.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 *ReconcileBroker) Reconcile(request reconcile.Request) (reconcile.Result, error) {
 	reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
 	reqLogger.Info("Reconciling Broker.")

 	// Fetch the Broker instance
 	broker := &rocketmqv1alpha1.Broker{}
 	err := r.client.Get(context.TODO(), request.NamespacedName, broker)
 	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("Broker 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 Broker.")
 		return reconcile.Result{}, err
 	}

 	if isInitial {
 		share.GroupNum = broker.Spec.Size
 	} else {
 		share.GroupNum = broker.Status.Size
 	}

 	share.BrokerClusterName = broker.Name
 	replicaPerGroup := broker.Spec.ReplicaPerGroup
 	reqLogger.Info("brokerGroupNum=" + strconv.Itoa(share.GroupNum) + ", replicaPerGroup=" + strconv.Itoa(replicaPerGroup))
 	for brokerGroupIndex := 0; brokerGroupIndex < share.GroupNum; brokerGroupIndex++ {
 		reqLogger.Info("Check Broker cluster " + strconv.Itoa(brokerGroupIndex+1) + "/" + strconv.Itoa(share.GroupNum))
 		dep := r.getBrokerStatefulSet(broker, brokerGroupIndex, 0)
 		// Check if the statefulSet already exists, if not create a new one
 		found := &appsv1.StatefulSet{}
 		err = r.client.Get(context.TODO(), types.NamespacedName{Name: dep.Name, Namespace: dep.Namespace}, found)
 		if err != nil && errors.IsNotFound(err) {
 			reqLogger.Info("Creating a new Master Broker StatefulSet.", "StatefulSet.Namespace", dep.Namespace, "StatefulSet.Name", dep.Name)
 			err = r.client.Create(context.TODO(), dep)
 			if err != nil {
 				reqLogger.Error(err, "Failed to create new StatefulSet of "+cons.BrokerClusterPrefix+strconv.Itoa(brokerGroupIndex), "StatefulSet.Namespace", dep.Namespace, "StatefulSet.Name", dep.Name)
 			}
 		} else if err != nil {
 			reqLogger.Error(err, "Failed to get broker master StatefulSet.")
 		}

 		for replicaIndex := 1; replicaIndex <= replicaPerGroup; replicaIndex++ {
 			reqLogger.Info("Check Replica Broker of cluster-" + strconv.Itoa(brokerGroupIndex) + " " + strconv.Itoa(replicaIndex) + "/" + strconv.Itoa(replicaPerGroup))
 			replicaDep := r.getBrokerStatefulSet(broker, brokerGroupIndex, replicaIndex)
 			err = r.client.Get(context.TODO(), types.NamespacedName{Name: replicaDep.Name, Namespace: replicaDep.Namespace}, found)
 			if err != nil && errors.IsNotFound(err) {
 				reqLogger.Info("Creating a new Replica Broker StatefulSet.", "StatefulSet.Namespace", replicaDep.Namespace, "StatefulSet.Name", replicaDep.Name)
 				err = r.client.Create(context.TODO(), replicaDep)
 				if err != nil {
 					reqLogger.Error(err, "Failed to create new StatefulSet of broker-"+strconv.Itoa(brokerGroupIndex)+"-replica-"+strconv.Itoa(replicaIndex), "StatefulSet.Namespace", replicaDep.Namespace, "StatefulSet.Name", replicaDep.Name)
 				}
 			} else if err != nil {
 				reqLogger.Error(err, "Failed to get broker replica StatefulSet.")
 			}
 		}
 	}


 	// Check for name server scaling
 	if broker.Spec.AllowRestart {
 		// The following code will restart all brokers to update NAMESRV_ADDR env
 		if share.IsNameServersStrUpdated {
 			for brokerGroupIndex := 0; brokerGroupIndex < broker.Spec.Size; brokerGroupIndex++ {
 				brokerName := getBrokerName(broker, brokerGroupIndex)
 				// Update master broker
 				reqLogger.Info("Update Master Broker NAMESRV_ADDR of " + brokerName)
 				dep := r.getBrokerStatefulSet(broker, brokerGroupIndex, 0)
 				found := &appsv1.StatefulSet{}
 				err = r.client.Get(context.TODO(), types.NamespacedName{Name: dep.Name, Namespace: dep.Namespace}, found)
 				if err != nil {
 					reqLogger.Error(err, "Failed to get broker master StatefulSet of "+brokerName)
 				} else {
 					found.Spec.Template.Spec.Containers[0].Env[0].Value = share.NameServersStr
 					err = r.client.Update(context.TODO(), found)
 					if err != nil {
 						reqLogger.Error(err, "Failed to update NAMESRV_ADDR of master broker "+brokerName, "StatefulSet.Namespace", found.Namespace, "StatefulSet.Name", found.Name)
 					} else {
 						reqLogger.Info("Successfully updated NAMESRV_ADDR of master broker "+brokerName, "StatefulSet.Namespace", found.Namespace, "StatefulSet.Name", found.Name)
 					}
 					time.Sleep(time.Duration(cons.RestartBrokerPodIntervalInSecond) * time.Second)
 				}
 				// Update replicas brokers
 				for replicaIndex := 1; replicaIndex <= replicaPerGroup; replicaIndex++ {
 					reqLogger.Info("Update Replica Broker NAMESRV_ADDR of " + brokerName + " " + strconv.Itoa(replicaIndex) + "/" + strconv.Itoa(replicaPerGroup))
 					replicaDep := r.getBrokerStatefulSet(broker, brokerGroupIndex, replicaIndex)
 					replicaFound := &appsv1.StatefulSet{}
 					err = r.client.Get(context.TODO(), types.NamespacedName{Name: replicaDep.Name, Namespace: replicaDep.Namespace}, replicaFound)
 					if err != nil {
 						reqLogger.Error(err, "Failed to get broker replica StatefulSet of "+brokerName)
 					} else {
 						replicaFound.Spec.Template.Spec.Containers[0].Env[0].Value = share.NameServersStr
 						err = r.client.Update(context.TODO(), replicaFound)
 						if err != nil {
 							reqLogger.Error(err, "Failed to update NAMESRV_ADDR of "+strconv.Itoa(brokerGroupIndex)+"-replica-"+strconv.Itoa(replicaIndex), "StatefulSet.Namespace", replicaFound.Namespace, "StatefulSet.Name", replicaFound.Name)
 						} else {
 							reqLogger.Info("Successfully updated NAMESRV_ADDR of "+strconv.Itoa(brokerGroupIndex)+"-replica-"+strconv.Itoa(replicaIndex), "StatefulSet.Namespace", replicaFound.Namespace, "StatefulSet.Name", replicaFound.Name)
 						}
 						time.Sleep(time.Duration(cons.RestartBrokerPodIntervalInSecond) * time.Second)
 					}
 				}
 			}
 		}
 		share.IsNameServersStrUpdated = false
 	}

 	// List the pods for this broker's statefulSet
 	podList := &corev1.PodList{}
 	labelSelector := labels.SelectorFromSet(labelsForBroker(broker.Name))
 	listOps := &client.ListOptions{
 		Namespace:     broker.Namespace,
 		LabelSelector: labelSelector,
 	}
 	err = r.client.List(context.TODO(), listOps, podList)
 	if err != nil {
 		reqLogger.Error(err, "Failed to list pods.", "Broker.Namespace", broker.Namespace, "Broker.Name", broker.Name)
 		return reconcile.Result{}, err
 	}
 	podNames := getPodNames(podList.Items)
 	log.Info("broker.Status.Nodes length = " + strconv.Itoa(len(broker.Status.Nodes)))
 	log.Info("podNames length = " + strconv.Itoa(len(podNames)))
 	// Ensure every pod is in running phase, then change the isInitial state to false
 	notReady := false
 	for _, pod := range podList.Items {
 		if !reflect.DeepEqual(pod.Status.Phase, corev1.PodRunning) {
 			log.Info("pod " + pod.Name + " phase is " + string(pod.Status.Phase) + ", wait for a moment...")
 			notReady = true
 		}
 	}
 	if !notReady {
 		isInitial = false
 	}

 	if !isInitial {
 		if broker.Spec.Size != broker.Status.Size  {
 			// Get the metadata including subscriptionGroup.json and topics.json from scale source pod
 			k8s, err := tool.NewK8sClient()
 			if err != nil {
 				log.Error(err,"Error occurred while getting K8s Client" )
 			}
 			sourcePodName := broker.Spec.ScalePodName
 			topicsCommand := getCopyMetadataJsonCommand(cons.TopicJsonDir, sourcePodName, broker.Namespace, k8s)
 			log.Info("topicsCommand: " + topicsCommand)
 			subscriptionGroupCommand := getCopyMetadataJsonCommand(cons.SubscriptionGroupJsonDir, sourcePodName, broker.Namespace, k8s)
 			log.Info("subscriptionGroupCommand: " + subscriptionGroupCommand)
 			MakeConfigDirCommand := "mkdir -p " + cons.StoreConfigDir
 			ChmodDirCommand := "chmod a+rw -R " + cons.StoreConfigDir
 			cmd = []string{"/bin/bash", "-c", MakeConfigDirCommand + " && " + ChmodDirCommand + " && " + topicsCommand + " && " + subscriptionGroupCommand}
 		}
 	}

 	// Update status.Size if needed
 	if broker.Spec.Size != broker.Status.Size  {
 		log.Info("broker.Status.Size = " + strconv.Itoa(broker.Status.Size))
 		log.Info("broker.Spec.Size = " + strconv.Itoa(broker.Spec.Size))
 		broker.Status.Size = broker.Spec.Size
 		err = r.client.Status().Update(context.TODO(), broker)
 		if err != nil {
 			reqLogger.Error(err, "Failed to update Broker Size status.")
 		}
 	}

 	// Update status.Nodes if needed
 	if !reflect.DeepEqual(podNames, broker.Status.Nodes) {
 		broker.Status.Nodes = podNames
 		err = r.client.Status().Update(context.TODO(), broker)
 		if err != nil {
 			reqLogger.Error(err, "Failed to update Broker Nodes status.")
 		}
 	}


 	//podList := &corev1.PodList{}
 	//labelSelector := labels.SelectorFromSet(labelsForBroker(broker.Name))
 	//listOps := &client.ListOptions{
 	//	Namespace:     broker.Namespace,
 	//	LabelSelector: labelSelector,
 	//}
 	//err = r.client.List(context.TODO(), listOps, podList)
 	//if err != nil {
 	//	reqLogger.Error(err, "Failed to list pods.", "Broker.Namespace", broker.Namespace, "Broker.Name", broker.Name)
 	//	return reconcile.Result{}, err
 	//}
 	//podNames := getPodNames(podList.Items)
 	//
 	//// Update status.Nodes if needed
 	//if !reflect.DeepEqual(podNames, broker.Status.Nodes) {
 	//	broker.Status.Nodes = podNames
 	//	err := r.client.Status().Update(context.TODO(), broker)
 	//	if err != nil {
 	//		reqLogger.Error(err, "Failed to update Broker status.")
 	//		return reconcile.Result{}, err
 	//	}
 	//}

 	return reconcile.Result{true, time.Duration(3) * time.Second}, nil
 }

 func getCopyMetadataJsonCommand(dir string, sourcePodName string, namespace string, k8s *tool.K8sClient) string {
 	cmdOpts := buildInputCommand(dir)
 	topicsJsonStr := exec(cmdOpts, sourcePodName, k8s, namespace)
 	topicsCommand := buildOutputCommand(topicsJsonStr, dir)
 	return strings.Join(topicsCommand, " ")
 }

 func buildInputCommand(source string) []string {
 	cmdOpts := []string{
 		"cat",
 		source,
 	}
 	return cmdOpts
 }

 func buildOutputCommand(content string, dest string) []string {
 	cmdOpts := []string{
 		"echo",
 		"-e",
 		"\"" + content + "\"",
 		">",
 		dest,
 	}
 	return cmdOpts
 }

 func exec(cmdOpts []string, podName string, k8s *tool.K8sClient, namespace string) string {
 	log.Info("On pod " + podName + ", command being run: " + strings.Join(cmdOpts, " "))
 	container := cons.BrokerContainerName
 	outputBytes, stderrBytes, err := k8s.Exec(namespace, podName, container, cmdOpts, nil)
 	stderr := stderrBytes.String()
 	output := outputBytes.String()

 	if stderrBytes != nil {
 		log.Info("STDERR: " + stderr)
 	}

 	if err != nil {
 		log.Error(err, "Error occurred while running command: " + strings.Join(cmdOpts, " "))
 		log.Info("stdout: " + output)
 	} else {
 		log.Info("output: " + output)
 	}
 	return output
 }

 func getBrokerName(broker *rocketmqv1alpha1.Broker, brokerGroupIndex int) string {
 	return broker.Name + "-" + strconv.Itoa(brokerGroupIndex)
 }

 // getBrokerStatefulSet returns a broker StatefulSet object
 func (r *ReconcileBroker) getBrokerStatefulSet(broker *rocketmqv1alpha1.Broker, brokerGroupIndex int, replicaIndex int) *appsv1.StatefulSet {
 	ls := labelsForBroker(broker.Name)
 	var a int32 = 1
 	var c = &a
 	var statefulSetName string
 	if replicaIndex == 0 {
 		statefulSetName = broker.Name + "-" + strconv.Itoa(brokerGroupIndex) + "-master"
 	} else {
 		statefulSetName = broker.Name + "-" + strconv.Itoa(brokerGroupIndex) + "-replica-" + strconv.Itoa(replicaIndex)
 	}

 	dep := &appsv1.StatefulSet{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      statefulSetName,
 			Namespace: broker.Namespace,
 		},
 		Spec: appsv1.StatefulSetSpec{
 			Replicas: c,
 			Selector: &metav1.LabelSelector{
 				MatchLabels: ls,
 			},
 			UpdateStrategy: appsv1.StatefulSetUpdateStrategy{
 				Type:          appsv1.RollingUpdateStatefulSetStrategyType,
 			},
 			Template: corev1.PodTemplateSpec{
 				ObjectMeta: metav1.ObjectMeta{
 					Labels: ls,
 				},
 				Spec: corev1.PodSpec{
 					Containers: []corev1.Container{{
 						Image:           broker.Spec.BrokerImage,
 						Name:            cons.BrokerContainerName,
 						Lifecycle: &corev1.Lifecycle{
 							PostStart: &corev1.Handler{
 								Exec: &corev1.ExecAction{
 									Command: cmd,
 								},
 							},
 						},
 						ImagePullPolicy: broker.Spec.ImagePullPolicy,
 						Env: []corev1.EnvVar{{
 							Name:  cons.EnvNameServiceAddress,
 							Value: broker.Spec.NameServers,
 						}, {
 							Name:  cons.EnvReplicationMode,
 							Value: broker.Spec.ReplicationMode,
 						}, {
 							Name:  cons.EnvBrokerId,
 							Value: strconv.Itoa(replicaIndex),
 						}, {
 							Name:  cons.EnvBrokerClusterName,
 							Value: broker.Name,
 						}, {
 							Name:  cons.EnvBrokerName,
 							Value: broker.Name + "-" + strconv.Itoa(brokerGroupIndex),
 						}},
 						Ports: []corev1.ContainerPort{{
 							ContainerPort: cons.BrokerVipContainerPort,
 							Name:          cons.BrokerVipContainerPortName,
 						}, {
 							ContainerPort: cons.BrokerMainContainerPort,
 							Name:          cons.BrokerMainContainerPortName,
 						}, {
 							ContainerPort: cons.BrokerHighAvailabilityContainerPort,
 							Name:          cons.BrokerHighAvailabilityContainerPortName,
 						}},
 						VolumeMounts: []corev1.VolumeMount{{
 							MountPath: cons.LogMountPath,
 							Name:      broker.Spec.VolumeClaimTemplates[0].Name,
 							SubPath:   cons.LogSubPathName + getPathSuffix(broker,  brokerGroupIndex, replicaIndex),
 						},{
 							MountPath: cons.StoreMountPath,
 							Name:      broker.Spec.VolumeClaimTemplates[0].Name,
 							SubPath:   cons.StoreSubPathName + getPathSuffix(broker, brokerGroupIndex, replicaIndex),
 						}},
 					}},
 					Volumes: getVolumes(broker),
 				},
 			},
 			VolumeClaimTemplates: getVolumeClaimTemplates(broker),
 		},
 	}
 	// Set Broker instance as the owner and controller
 	controllerutil.SetControllerReference(broker, dep, r.scheme)

 	return dep

 }

 func getVolumeClaimTemplates(broker *rocketmqv1alpha1.Broker) []corev1.PersistentVolumeClaim{
 	switch broker.Spec.StorageMode {
 	case cons.StorageModeNFS:
 		return broker.Spec.VolumeClaimTemplates
 	case cons.StorageModeEmptyDir, cons.StorageModeHostPath:
 		fallthrough
 	default:
 		return nil
 	}
 }

 func getVolumes(broker *rocketmqv1alpha1.Broker) []corev1.Volume {
 	switch broker.Spec.StorageMode {
 	case cons.StorageModeNFS:
 		return nil
 	case cons.StorageModeEmptyDir:
 		volumes := []corev1.Volume{{
 			Name: broker.Spec.VolumeClaimTemplates[0].Name,
 			VolumeSource: corev1.VolumeSource{
 				EmptyDir: &corev1.EmptyDirVolumeSource{

 				}},
 		}}
 		return volumes
 	case cons.StorageModeHostPath:
 		fallthrough
 	default:
 		volumes := []corev1.Volume{{
 			Name: broker.Spec.VolumeClaimTemplates[0].Name,
 			VolumeSource: corev1.VolumeSource{
 				HostPath: &corev1.HostPathVolumeSource{
 					Path: broker.Spec.HostPath,
 				}},
 		}}
 		return volumes
 	}
 }

 func getPathSuffix(broker *rocketmqv1alpha1.Broker, brokerGroupIndex int, replicaIndex int) string {
 	if replicaIndex == 0 {
 		return "/" + broker.Name + "-" + strconv.Itoa(brokerGroupIndex) + "-master"
 	} else {
 		return "/" + broker.Name + "-" + strconv.Itoa(brokerGroupIndex) + "-replica-" + strconv.Itoa(replicaIndex)
 	}
 }

 // labelsForBroker returns the labels for selecting the resources
 // belonging to the given broker CR name.
 func labelsForBroker(name string) map[string]string {
 	return map[string]string{"app": "broker", "broker_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
 }

 func contains(item string, arr []string) bool {
 	for _, value := range arr {
 		if reflect.DeepEqual(value, item) {
 			return true
 		}
 	}
 	return false
 }

 func checkAndCopyMetadata(newPodNames []string, dir string, sourcePodName string, namespace string, k8s *tool.K8sClient)  {
 	cmdOpts := buildInputCommand(dir)
 	jsonStr := exec(cmdOpts, sourcePodName, k8s, namespace)
 	if len(jsonStr) < cons.MinMetadataJsonFileSize {
 		log.Info("The file " + dir + " is abnormally too short to execute metadata transmission, please check whether the source broker pod " + sourcePodName + " is correct")
 	} else {
 		// for each new pod, copy the metadata from the scale source pod
 		for _, newPodName := range newPodNames {
 			cmdOpts = buildOutputCommand(jsonStr, dir)
 			exec(cmdOpts, newPodName, k8s, namespace)
 		}
 	}
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You 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 broker

	import (
	"context"
	"reflect"
	"strconv"
	"strings"
	"time"

	rocketmqv1alpha1 "github.com/apache/rocketmq-operator/pkg/apis/rocketmq/v1alpha1"
	cons "github.com/apache/rocketmq-operator/pkg/constants"
	"github.com/apache/rocketmq-operator/pkg/share"
	"github.com/apache/rocketmq-operator/pkg/tool"
	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_broker")
	var isInitial = true
	var cmd = []string{"/bin/bash", "-c", "echo Initial broker"}

	/**
	* 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 Broker 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 &ReconcileBroker{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("broker-controller", mgr, controller.Options{Reconciler: r})
	if err != nil {
	return err
	}

	// Watch for changes to primary resource Broker
	err = c.Watch(&source.Kind{Type: &rocketmqv1alpha1.Broker{}}, &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 Broker
	err = c.Watch(&source.Kind{Type: &corev1.Pod{}}, &handler.EnqueueRequestForOwner{
	IsController: true,
	OwnerType: &rocketmqv1alpha1.Broker{},
	})
	if err != nil {
	return err
	}

	return nil
	}

	// blank assignment to verify that ReconcileBroker implements reconcile.Reconciler
	var _ reconcile.Reconciler = &ReconcileBroker{}

	// ReconcileBroker reconciles a Broker object
	type ReconcileBroker 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 Broker object and makes changes based on the state read
	// and what is in the Broker.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 *ReconcileBroker) Reconcile(request reconcile.Request) (reconcile.Result, error) {
	reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
	reqLogger.Info("Reconciling Broker.")

	// Fetch the Broker instance
	broker := &rocketmqv1alpha1.Broker{}
	err := r.client.Get(context.TODO(), request.NamespacedName, broker)
	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("Broker 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 Broker.")
	return reconcile.Result{}, err
	}

	if isInitial {
	share.GroupNum = broker.Spec.Size
	} else {
	share.GroupNum = broker.Status.Size
	}

	share.BrokerClusterName = broker.Name
	replicaPerGroup := broker.Spec.ReplicaPerGroup
	reqLogger.Info("brokerGroupNum=" + strconv.Itoa(share.GroupNum) + ", replicaPerGroup=" + strconv.Itoa(replicaPerGroup))
	for brokerGroupIndex := 0; brokerGroupIndex < share.GroupNum; brokerGroupIndex++ {
	reqLogger.Info("Check Broker cluster " + strconv.Itoa(brokerGroupIndex+1) + "/" + strconv.Itoa(share.GroupNum))
	dep := r.getBrokerStatefulSet(broker, brokerGroupIndex, 0)
	// Check if the statefulSet already exists, if not create a new one
	found := &appsv1.StatefulSet{}
	err = r.client.Get(context.TODO(), types.NamespacedName{Name: dep.Name, Namespace: dep.Namespace}, found)
	if err != nil && errors.IsNotFound(err) {
	reqLogger.Info("Creating a new Master Broker StatefulSet.", "StatefulSet.Namespace", dep.Namespace, "StatefulSet.Name", dep.Name)
	err = r.client.Create(context.TODO(), dep)
	if err != nil {
	reqLogger.Error(err, "Failed to create new StatefulSet of "+cons.BrokerClusterPrefix+strconv.Itoa(brokerGroupIndex), "StatefulSet.Namespace", dep.Namespace, "StatefulSet.Name", dep.Name)
	}
	} else if err != nil {
	reqLogger.Error(err, "Failed to get broker master StatefulSet.")
	}

	for replicaIndex := 1; replicaIndex <= replicaPerGroup; replicaIndex++ {
	reqLogger.Info("Check Replica Broker of cluster-" + strconv.Itoa(brokerGroupIndex) + " " + strconv.Itoa(replicaIndex) + "/" + strconv.Itoa(replicaPerGroup))
	replicaDep := r.getBrokerStatefulSet(broker, brokerGroupIndex, replicaIndex)
	err = r.client.Get(context.TODO(), types.NamespacedName{Name: replicaDep.Name, Namespace: replicaDep.Namespace}, found)
	if err != nil && errors.IsNotFound(err) {
	reqLogger.Info("Creating a new Replica Broker StatefulSet.", "StatefulSet.Namespace", replicaDep.Namespace, "StatefulSet.Name", replicaDep.Name)
	err = r.client.Create(context.TODO(), replicaDep)
	if err != nil {
	reqLogger.Error(err, "Failed to create new StatefulSet of broker-"+strconv.Itoa(brokerGroupIndex)+"-replica-"+strconv.Itoa(replicaIndex), "StatefulSet.Namespace", replicaDep.Namespace, "StatefulSet.Name", replicaDep.Name)
	}
	} else if err != nil {
	reqLogger.Error(err, "Failed to get broker replica StatefulSet.")
	}
	}
	}


	// Check for name server scaling
	if broker.Spec.AllowRestart {
	// The following code will restart all brokers to update NAMESRV_ADDR env
	if share.IsNameServersStrUpdated {
	for brokerGroupIndex := 0; brokerGroupIndex < broker.Spec.Size; brokerGroupIndex++ {
	brokerName := getBrokerName(broker, brokerGroupIndex)
	// Update master broker
	reqLogger.Info("Update Master Broker NAMESRV_ADDR of " + brokerName)
	dep := r.getBrokerStatefulSet(broker, brokerGroupIndex, 0)
	found := &appsv1.StatefulSet{}
	err = r.client.Get(context.TODO(), types.NamespacedName{Name: dep.Name, Namespace: dep.Namespace}, found)
	if err != nil {
	reqLogger.Error(err, "Failed to get broker master StatefulSet of "+brokerName)
	} else {
	found.Spec.Template.Spec.Containers[0].Env[0].Value = share.NameServersStr
	err = r.client.Update(context.TODO(), found)
	if err != nil {
	reqLogger.Error(err, "Failed to update NAMESRV_ADDR of master broker "+brokerName, "StatefulSet.Namespace", found.Namespace, "StatefulSet.Name", found.Name)
	} else {
	reqLogger.Info("Successfully updated NAMESRV_ADDR of master broker "+brokerName, "StatefulSet.Namespace", found.Namespace, "StatefulSet.Name", found.Name)
	}
	time.Sleep(time.Duration(cons.RestartBrokerPodIntervalInSecond) * time.Second)
	}
	// Update replicas brokers
	for replicaIndex := 1; replicaIndex <= replicaPerGroup; replicaIndex++ {
	reqLogger.Info("Update Replica Broker NAMESRV_ADDR of " + brokerName + " " + strconv.Itoa(replicaIndex) + "/" + strconv.Itoa(replicaPerGroup))
	replicaDep := r.getBrokerStatefulSet(broker, brokerGroupIndex, replicaIndex)
	replicaFound := &appsv1.StatefulSet{}
	err = r.client.Get(context.TODO(), types.NamespacedName{Name: replicaDep.Name, Namespace: replicaDep.Namespace}, replicaFound)
	if err != nil {
	reqLogger.Error(err, "Failed to get broker replica StatefulSet of "+brokerName)
	} else {
	replicaFound.Spec.Template.Spec.Containers[0].Env[0].Value = share.NameServersStr
	err = r.client.Update(context.TODO(), replicaFound)
	if err != nil {
	reqLogger.Error(err, "Failed to update NAMESRV_ADDR of "+strconv.Itoa(brokerGroupIndex)+"-replica-"+strconv.Itoa(replicaIndex), "StatefulSet.Namespace", replicaFound.Namespace, "StatefulSet.Name", replicaFound.Name)
	} else {
	reqLogger.Info("Successfully updated NAMESRV_ADDR of "+strconv.Itoa(brokerGroupIndex)+"-replica-"+strconv.Itoa(replicaIndex), "StatefulSet.Namespace", replicaFound.Namespace, "StatefulSet.Name", replicaFound.Name)
	}
	time.Sleep(time.Duration(cons.RestartBrokerPodIntervalInSecond) * time.Second)
	}
	}
	}
	}
	share.IsNameServersStrUpdated = false
	}

	// List the pods for this broker's statefulSet
	podList := &corev1.PodList{}
	labelSelector := labels.SelectorFromSet(labelsForBroker(broker.Name))
	listOps := &client.ListOptions{
	Namespace: broker.Namespace,
	LabelSelector: labelSelector,
	}
	err = r.client.List(context.TODO(), listOps, podList)
	if err != nil {
	reqLogger.Error(err, "Failed to list pods.", "Broker.Namespace", broker.Namespace, "Broker.Name", broker.Name)
	return reconcile.Result{}, err
	}
	podNames := getPodNames(podList.Items)
	log.Info("broker.Status.Nodes length = " + strconv.Itoa(len(broker.Status.Nodes)))
	log.Info("podNames length = " + strconv.Itoa(len(podNames)))
	// Ensure every pod is in running phase, then change the isInitial state to false
	notReady := false
	for _, pod := range podList.Items {
	if !reflect.DeepEqual(pod.Status.Phase, corev1.PodRunning) {
	log.Info("pod " + pod.Name + " phase is " + string(pod.Status.Phase) + ", wait for a moment...")
	notReady = true
	}
	}
	if !notReady {
	isInitial = false
	}

	if !isInitial {
	if broker.Spec.Size != broker.Status.Size {
	// Get the metadata including subscriptionGroup.json and topics.json from scale source pod
	k8s, err := tool.NewK8sClient()
	if err != nil {
	log.Error(err,"Error occurred while getting K8s Client" )
	}
	sourcePodName := broker.Spec.ScalePodName
	topicsCommand := getCopyMetadataJsonCommand(cons.TopicJsonDir, sourcePodName, broker.Namespace, k8s)
	log.Info("topicsCommand: " + topicsCommand)
	subscriptionGroupCommand := getCopyMetadataJsonCommand(cons.SubscriptionGroupJsonDir, sourcePodName, broker.Namespace, k8s)
	log.Info("subscriptionGroupCommand: " + subscriptionGroupCommand)
	MakeConfigDirCommand := "mkdir -p " + cons.StoreConfigDir
	ChmodDirCommand := "chmod a+rw -R " + cons.StoreConfigDir
	cmd = []string{"/bin/bash", "-c", MakeConfigDirCommand + " && " + ChmodDirCommand + " && " + topicsCommand + " && " + subscriptionGroupCommand}
	}
	}

	// Update status.Size if needed
	if broker.Spec.Size != broker.Status.Size {
	log.Info("broker.Status.Size = " + strconv.Itoa(broker.Status.Size))
	log.Info("broker.Spec.Size = " + strconv.Itoa(broker.Spec.Size))
	broker.Status.Size = broker.Spec.Size
	err = r.client.Status().Update(context.TODO(), broker)
	if err != nil {
	reqLogger.Error(err, "Failed to update Broker Size status.")
	}
	}

	// Update status.Nodes if needed
	if !reflect.DeepEqual(podNames, broker.Status.Nodes) {
	broker.Status.Nodes = podNames
	err = r.client.Status().Update(context.TODO(), broker)
	if err != nil {
	reqLogger.Error(err, "Failed to update Broker Nodes status.")
	}
	}


	//podList := &corev1.PodList{}
	//labelSelector := labels.SelectorFromSet(labelsForBroker(broker.Name))
	//listOps := &client.ListOptions{
	// Namespace: broker.Namespace,
	// LabelSelector: labelSelector,
	//}
	//err = r.client.List(context.TODO(), listOps, podList)
	//if err != nil {
	// reqLogger.Error(err, "Failed to list pods.", "Broker.Namespace", broker.Namespace, "Broker.Name", broker.Name)
	// return reconcile.Result{}, err
	//}
	//podNames := getPodNames(podList.Items)
	//
	//// Update status.Nodes if needed
	//if !reflect.DeepEqual(podNames, broker.Status.Nodes) {
	// broker.Status.Nodes = podNames
	// err := r.client.Status().Update(context.TODO(), broker)
	// if err != nil {
	// reqLogger.Error(err, "Failed to update Broker status.")
	// return reconcile.Result{}, err
	// }
	//}

	return reconcile.Result{true, time.Duration(3) * time.Second}, nil
	}

	func getCopyMetadataJsonCommand(dir string, sourcePodName string, namespace string, k8s *tool.K8sClient) string {
	cmdOpts := buildInputCommand(dir)
	topicsJsonStr := exec(cmdOpts, sourcePodName, k8s, namespace)
	topicsCommand := buildOutputCommand(topicsJsonStr, dir)
	return strings.Join(topicsCommand, " ")
	}

	func buildInputCommand(source string) []string {
	cmdOpts := []string{
	"cat",
	source,
	}
	return cmdOpts
	}

	func buildOutputCommand(content string, dest string) []string {
	cmdOpts := []string{
	"echo",
	"-e",
	"\"" + content + "\"",
	">",
	dest,
	}
	return cmdOpts
	}

	func exec(cmdOpts []string, podName string, k8s *tool.K8sClient, namespace string) string {
	log.Info("On pod " + podName + ", command being run: " + strings.Join(cmdOpts, " "))
	container := cons.BrokerContainerName
	outputBytes, stderrBytes, err := k8s.Exec(namespace, podName, container, cmdOpts, nil)
	stderr := stderrBytes.String()
	output := outputBytes.String()

	if stderrBytes != nil {
	log.Info("STDERR: " + stderr)
	}

	if err != nil {
	log.Error(err, "Error occurred while running command: " + strings.Join(cmdOpts, " "))
	log.Info("stdout: " + output)
	} else {
	log.Info("output: " + output)
	}
	return output
	}

	func getBrokerName(broker *rocketmqv1alpha1.Broker, brokerGroupIndex int) string {
	return broker.Name + "-" + strconv.Itoa(brokerGroupIndex)
	}

	// getBrokerStatefulSet returns a broker StatefulSet object
	func (r ReconcileBroker) getBrokerStatefulSet(broker rocketmqv1alpha1.Broker, brokerGroupIndex int, replicaIndex int) *appsv1.StatefulSet {
	ls := labelsForBroker(broker.Name)
	var a int32 = 1
	var c = &a
	var statefulSetName string
	if replicaIndex == 0 {
	statefulSetName = broker.Name + "-" + strconv.Itoa(brokerGroupIndex) + "-master"
	} else {
	statefulSetName = broker.Name + "-" + strconv.Itoa(brokerGroupIndex) + "-replica-" + strconv.Itoa(replicaIndex)
	}

	dep := &appsv1.StatefulSet{
	ObjectMeta: metav1.ObjectMeta{
	Name: statefulSetName,
	Namespace: broker.Namespace,
	},
	Spec: appsv1.StatefulSetSpec{
	Replicas: c,
	Selector: &metav1.LabelSelector{
	MatchLabels: ls,
	},
	UpdateStrategy: appsv1.StatefulSetUpdateStrategy{
	Type: appsv1.RollingUpdateStatefulSetStrategyType,
	},
	Template: corev1.PodTemplateSpec{
	ObjectMeta: metav1.ObjectMeta{
	Labels: ls,
	},
	Spec: corev1.PodSpec{
	Containers: []corev1.Container{{
	Image: broker.Spec.BrokerImage,
	Name: cons.BrokerContainerName,
	Lifecycle: &corev1.Lifecycle{
	PostStart: &corev1.Handler{
	Exec: &corev1.ExecAction{
	Command: cmd,
	},
	},
	},
	ImagePullPolicy: broker.Spec.ImagePullPolicy,
	Env: []corev1.EnvVar{{
	Name: cons.EnvNameServiceAddress,
	Value: broker.Spec.NameServers,
	}, {
	Name: cons.EnvReplicationMode,
	Value: broker.Spec.ReplicationMode,
	}, {
	Name: cons.EnvBrokerId,
	Value: strconv.Itoa(replicaIndex),
	}, {
	Name: cons.EnvBrokerClusterName,
	Value: broker.Name,
	}, {
	Name: cons.EnvBrokerName,
	Value: broker.Name + "-" + strconv.Itoa(brokerGroupIndex),
	}},
	Ports: []corev1.ContainerPort{{
	ContainerPort: cons.BrokerVipContainerPort,
	Name: cons.BrokerVipContainerPortName,
	}, {
	ContainerPort: cons.BrokerMainContainerPort,
	Name: cons.BrokerMainContainerPortName,
	}, {
	ContainerPort: cons.BrokerHighAvailabilityContainerPort,
	Name: cons.BrokerHighAvailabilityContainerPortName,
	}},
	VolumeMounts: []corev1.VolumeMount{{
	MountPath: cons.LogMountPath,
	Name: broker.Spec.VolumeClaimTemplates[0].Name,
	SubPath: cons.LogSubPathName + getPathSuffix(broker, brokerGroupIndex, replicaIndex),
	},{
	MountPath: cons.StoreMountPath,
	Name: broker.Spec.VolumeClaimTemplates[0].Name,
	SubPath: cons.StoreSubPathName + getPathSuffix(broker, brokerGroupIndex, replicaIndex),
	}},
	}},
	Volumes: getVolumes(broker),
	},
	},
	VolumeClaimTemplates: getVolumeClaimTemplates(broker),
	},
	}
	// Set Broker instance as the owner and controller
	controllerutil.SetControllerReference(broker, dep, r.scheme)

	return dep

	}

	func getVolumeClaimTemplates(broker *rocketmqv1alpha1.Broker) []corev1.PersistentVolumeClaim{
	switch broker.Spec.StorageMode {
	case cons.StorageModeNFS:
	return broker.Spec.VolumeClaimTemplates
	case cons.StorageModeEmptyDir, cons.StorageModeHostPath:
	fallthrough
	default:
	return nil
	}
	}

	func getVolumes(broker *rocketmqv1alpha1.Broker) []corev1.Volume {
	switch broker.Spec.StorageMode {
	case cons.StorageModeNFS:
	return nil
	case cons.StorageModeEmptyDir:
	volumes := []corev1.Volume{{
	Name: broker.Spec.VolumeClaimTemplates[0].Name,
	VolumeSource: corev1.VolumeSource{
	EmptyDir: &corev1.EmptyDirVolumeSource{

	}},
	}}
	return volumes
	case cons.StorageModeHostPath:
	fallthrough
	default:
	volumes := []corev1.Volume{{
	Name: broker.Spec.VolumeClaimTemplates[0].Name,
	VolumeSource: corev1.VolumeSource{
	HostPath: &corev1.HostPathVolumeSource{
	Path: broker.Spec.HostPath,
	}},
	}}
	return volumes
	}
	}

	func getPathSuffix(broker *rocketmqv1alpha1.Broker, brokerGroupIndex int, replicaIndex int) string {
	if replicaIndex == 0 {
	return "/" + broker.Name + "-" + strconv.Itoa(brokerGroupIndex) + "-master"
	} else {
	return "/" + broker.Name + "-" + strconv.Itoa(brokerGroupIndex) + "-replica-" + strconv.Itoa(replicaIndex)
	}
	}

	// labelsForBroker returns the labels for selecting the resources
	// belonging to the given broker CR name.
	func labelsForBroker(name string) map[string]string {
	return map[string]string{"app": "broker", "broker_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
	}

	func contains(item string, arr []string) bool {
	for _, value := range arr {
	if reflect.DeepEqual(value, item) {
	return true
	}
	}
	return false
	}

	func checkAndCopyMetadata(newPodNames []string, dir string, sourcePodName string, namespace string, k8s *tool.K8sClient) {
	cmdOpts := buildInputCommand(dir)
	jsonStr := exec(cmdOpts, sourcePodName, k8s, namespace)
	if len(jsonStr) < cons.MinMetadataJsonFileSize {
	log.Info("The file " + dir + " is abnormally too short to execute metadata transmission, please check whether the source broker pod " + sourcePodName + " is correct")
	} else {
	// for each new pod, copy the metadata from the scale source pod
	for _, newPodName := range newPodNames {
	cmdOpts = buildOutputCommand(jsonStr, dir)
	exec(cmdOpts, newPodName, k8s, namespace)
	}
	}
	}