/
clusterrolebinding_controller.go
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/
clusterrolebinding_controller.go
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// 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 clusterrolebinding
import (
"context"
"reflect"
"time"
"github.com/aws/aws-sdk-go/aws/session"
clusterv1alpha1 "github.com/awslabs/aws-eks-cluster-controller/pkg/apis/cluster/v1alpha1"
componentsv1alpha1 "github.com/awslabs/aws-eks-cluster-controller/pkg/apis/components/v1alpha1"
"github.com/awslabs/aws-eks-cluster-controller/pkg/authorizer"
"github.com/awslabs/aws-eks-cluster-controller/pkg/finalizers"
"github.com/awslabs/aws-eks-cluster-controller/pkg/logging"
"go.uber.org/zap"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"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"
"sigs.k8s.io/controller-runtime/pkg/source"
)
const (
ClusterRoleBindingFinalizer = "clusterrolebinding.components.eks.amazon.com"
)
// Add creates a new ClusterRoleBinding Controller and adds it to the Manager with default RBAC. 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 {
sess := session.Must(session.NewSession())
log := logging.New()
return &ReconcileClusterRoleBinding{
Client: mgr.GetClient(),
scheme: mgr.GetScheme(),
log: log,
sess: sess,
auth: authorizer.NewEks(sess, log),
}
}
// This is for testing. It will return a reconciler that will use the Client for both local and remote calls.
func newTestReconciler(mgr manager.Manager) reconcile.Reconciler {
return &ReconcileClusterRoleBinding{
Client: mgr.GetClient(),
scheme: mgr.GetScheme(),
log: logging.New(),
sess: session.Must(session.NewSession()),
auth: authorizer.NewFake(mgr.GetClient()),
}
}
// 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("clusterrolebinding-controller", mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
// Watch for changes to ClusterRoleBinding
err = c.Watch(&source.Kind{Type: &componentsv1alpha1.ClusterRoleBinding{}}, &handler.EnqueueRequestForObject{})
if err != nil {
return err
}
return nil
}
var _ reconcile.Reconciler = &ReconcileClusterRoleBinding{}
// ReconcileClusterRoleBinding reconciles a ClusterRoleBinding object
type ReconcileClusterRoleBinding struct {
client.Client
scheme *runtime.Scheme
log *zap.Logger
sess *session.Session
auth authorizer.Authorizer
}
// Reconcile reads that state of the cluster for a ClusterRoleBinding object and makes changes based on the state read
// and what is in the ClusterRoleBinding.Spec
// Automatically generate RBAC rules to allow the Controller to read and write Deployments
// +kubebuilder:rbac:groups=apps,resources=deployments,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=apps,resources=deployments/status,verbs=get;update;patch
// +kubebuilder:rbac:groups=components.eks.amazonaws.com,resources=clusterrolebindings,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=components.eks.amazonaws.com,resources=clusterrolebindings/status,verbs=get;update;patch
func (r *ReconcileClusterRoleBinding) Reconcile(request reconcile.Request) (reconcile.Result, error) {
log := r.log.With(
zap.String("Name", request.Name),
zap.String("Namespace", request.Namespace),
zap.String("Kind", "clusterrolebinding.components.eks.amazon.com"),
)
// Fetch the ClusterRoleBinding instance
instance := &componentsv1alpha1.ClusterRoleBinding{}
err := r.Get(context.TODO(), request.NamespacedName, instance)
if err != nil {
if errors.IsNotFound(err) {
// Object not found, return. Created objects are automatically garbage collected.
// For additional cleanup logic use finalizers.
return reconcile.Result{}, nil
}
// Error reading the object - requeue the request.
return reconcile.Result{}, err
}
remoteKey := types.NamespacedName{Name: instance.Spec.Name}
cluster := &clusterv1alpha1.EKS{}
clusterKey := types.NamespacedName{Name: instance.Spec.Cluster, Namespace: instance.Namespace}
if err := r.Get(context.TODO(), clusterKey, cluster); err != nil {
instance.Finalizers = []string{}
instance.Status.Status = "EKS Cluster not found"
log.Error("EKS cluster not found", zap.Error(err))
r.Update(context.TODO(), instance)
return reconcile.Result{RequeueAfter: 5 * time.Second}, nil
}
log.Info("got cluster", zap.String("ClusterName", cluster.Name))
if err := controllerutil.SetControllerReference(cluster, instance, r.scheme); err != nil {
return reconcile.Result{}, nil
}
client, err := r.auth.GetClient(cluster)
if err != nil {
log.Error("could not access remote cluster", zap.Error(err))
return reconcile.Result{}, err
}
if !instance.ObjectMeta.DeletionTimestamp.IsZero() {
if finalizers.HasFinalizer(instance, ClusterRoleBindingFinalizer) {
log.Info("deleting clusterrolebinding")
found := &rbacv1.ClusterRoleBinding{}
err := client.Get(context.TODO(), remoteKey, found)
if err != nil && errors.IsNotFound(err) {
instance.Finalizers = finalizers.RemoveFinalizer(instance, ClusterRoleBindingFinalizer)
if err := r.Client.Update(context.TODO(), instance); err != nil {
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
} else if err != nil {
log.Error("could not get remote clusterrolebinding", zap.Error(err))
return reconcile.Result{}, nil
}
if err := client.Delete(context.TODO(), found); err != nil {
log.Error("could not delete remote clusterrolebinding", zap.Error(err))
}
return reconcile.Result{}, nil
}
return reconcile.Result{}, nil
}
rClusterRoleBinding := &rbacv1.ClusterRoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: instance.Spec.Name,
Labels: instance.Labels,
Annotations: instance.Annotations,
},
RoleRef: instance.Spec.RoleRef,
Subjects: instance.Spec.Subjects,
}
found := &rbacv1.ClusterRoleBinding{}
err = client.Get(context.TODO(), remoteKey, found)
if err != nil && errors.IsNotFound(err) {
log.Info("creating clusterrolebinding")
if err := client.Create(context.TODO(), rClusterRoleBinding); err != nil {
log.Error("failed to create remote clusterrolebinding", zap.Error(err))
return reconcile.Result{}, err
}
instance.Finalizers = []string{ClusterRoleBindingFinalizer}
instance.Status.Status = "Created"
if err := r.Client.Update(context.TODO(), instance); err != nil {
log.Error("failed to create clusterrolebinding", zap.Error(err))
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
} else if err != nil {
return reconcile.Result{}, err
}
if !reflect.DeepEqual(found.Subjects, instance.Spec.Subjects) ||
!reflect.DeepEqual(found.RoleRef, instance.Spec.RoleRef) {
found.RoleRef = instance.Spec.RoleRef
found.Subjects = instance.Spec.Subjects
log.Info("updating clusterrolebinding")
err := client.Update(context.TODO(), found)
if err != nil {
log.Error("failed to update remote clusterrolebinding", zap.Error(err))
return reconcile.Result{}, err
}
}
return reconcile.Result{}, nil
}