forked from gardener-attic/gardener-extensions
/
actuator.go
285 lines (240 loc) · 8.55 KB
/
actuator.go
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// Copyright (c) 2019 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 certservice
import (
"context"
"fmt"
"path/filepath"
"github.com/gardener/gardener-extensions/controllers/extension-certificate-service/pkg/apis/config"
"github.com/gardener/gardener-extensions/controllers/extension-certificate-service/pkg/controller/certservice/internal"
"github.com/gardener/gardener-extensions/controllers/extension-certificate-service/pkg/imagevector"
"github.com/gardener/gardener-extensions/controllers/extension-certificate-service/pkg/utils"
"github.com/gardener/gardener-extensions/pkg/controller"
"github.com/gardener/gardener-extensions/pkg/controller/extension"
"github.com/gardener/gardener-extensions/pkg/util"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
gardenv1beta1 "github.com/gardener/gardener/pkg/apis/garden/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/utils/chart"
"github.com/gardener/gardener/pkg/utils/secrets"
"github.com/go-logr/logr"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/runtime/log"
)
// ActuatorName is the name of the Certificate Service actuator.
const ActuatorName = "certificate-service-actuator"
// NewActuator returns an actuator responsible for Extension resources.
func NewActuator(config config.Configuration) extension.Actuator {
return &actuator{
logger: log.Log.WithName(ActuatorName),
certServiceConfig: config,
}
}
type actuator struct {
applier kubernetes.ChartApplier
client client.Client
config *rest.Config
certServiceConfig config.Configuration
logger logr.Logger
}
// Reconcile the Extension resource.
func (a *actuator) Reconcile(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
namespace := ex.GetNamespace()
secret, err := util.GetGardenerSecret(ctx, a.client, namespace)
if err != nil {
return fmt.Errorf("Error getting Gardener secret from namespace %s: %v", namespace, err)
}
kubecfg, err := util.GetKubeconfigFromSecret(secret)
if err != nil {
return fmt.Errorf("Error creating Kubeconfig to deploy RBAC manifests: %v", err)
}
cluster, err := controller.GetCluster(ctx, a.client, namespace)
if err != nil {
return err
}
dns := cluster.Shoot.Spec.DNS
if dns.Domain == nil && dns.Provider == gardenv1beta1.DNSUnmanaged {
return nil
}
if !controller.IsHibernated(cluster.Shoot) {
if err := a.createRBAC(ctx, kubecfg); err != nil {
return err
}
}
return a.createCertBroker(ctx, cluster.Shoot, namespace)
}
// Delete the Extension resource.
func (a *actuator) Delete(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
namespace := ex.GetNamespace()
if err := a.deleteCertBroker(ctx, namespace); err != nil {
return err
}
secret, err := util.GetGardenerSecret(ctx, a.client, namespace)
if err != nil {
return fmt.Errorf("Error getting Gardener secret from namespace %s: %v", namespace, err)
}
kubecfg, err := clientcmd.RESTConfigFromKubeConfig(secret.Data["kubeconfig"])
if err != nil {
return fmt.Errorf("Error creating Kubeconfig to delete RBAC manifests: %v", err)
}
if err := a.deleteRBAC(ctx, kubecfg); err != nil {
return err
}
return nil
}
// InjectConfig injects the rest config to this actuator.
func (a *actuator) InjectConfig(config *rest.Config) error {
a.config = config
applier, err := kubernetes.NewChartApplierForConfig(a.config)
if err != nil {
return fmt.Errorf("failed to create chart applier: %v", err)
}
a.applier = applier
return nil
}
// InjectClient injects the controller runtime client into the reconciler.
func (a *actuator) InjectClient(client client.Client) error {
a.client = client
return nil
}
func (a *actuator) createCertBroker(ctx context.Context, shoot *gardenv1beta1.Shoot, namespace string) error {
shootDomain := shoot.Spec.DNS.Domain
if shootDomain == nil {
return fmt.Errorf("no domain given for shoot %s/%s", shoot.GetName(), shoot.GetNamespace())
}
var (
dns []map[string]string
configSpec = a.certServiceConfig.Spec
)
for _, route53Provider := range configSpec.Providers.Route53 {
if route53values := internal.CreateDNSProviderValue(&route53Provider, *shootDomain); route53values != nil {
dns = append(dns, route53values)
}
}
for _, cloudDNSProvider := range configSpec.Providers.CloudDNS {
if cloudDNSValues := internal.CreateDNSProviderValue(&cloudDNSProvider, *shootDomain); cloudDNSValues != nil {
dns = append(dns, cloudDNSValues)
}
}
shootKubeconfig, err := a.createKubeconfigForCertManager(ctx, namespace)
if err != nil {
return err
}
shootKubeconfigChecksum := util.ComputeChecksum(shootKubeconfig.Data)
certBrokerConfig := map[string]interface{}{
"replicas": util.GetReplicaCount(shoot, 1),
"certbroker": map[string]interface{}{
"targetClusterSecret": shootKubeconfig.GetName(),
},
"certmanager": map[string]interface{}{
"clusterissuer": configSpec.IssuerName,
"dns": dns,
},
"podAnnotations": map[string]interface{}{
"checksum/secret-cert-broker": shootKubeconfigChecksum,
},
}
certBrokerConfig, err = chart.InjectImages(certBrokerConfig, imagevector.ImageVector(), []string{utils.CertBrokerImageName})
if err != nil {
return fmt.Errorf("failed to find image version for %s: %v", utils.CertBrokerImageName, err)
}
a.logger.Info("Component is being applied", "component", "cert-broker", "namespace", namespace)
return a.applier.ApplyChartInNamespace(
ctx,
filepath.Join(utils.ChartsPath, utils.CertBrokerResourceName),
namespace,
utils.CertBrokerResourceName,
certBrokerConfig,
nil,
)
}
func (a *actuator) deleteCertBroker(ctx context.Context, namespace string) error {
meta := metav1.ObjectMeta{
Name: utils.CertBrokerResourceName,
Namespace: namespace,
}
objects := []runtime.Object{
&appsv1.Deployment{
ObjectMeta: meta,
},
&corev1.Secret{
ObjectMeta: meta,
},
&corev1.ServiceAccount{
ObjectMeta: meta,
},
&rbacv1.RoleBinding{
ObjectMeta: meta,
},
&rbacv1.ClusterRoleBinding{
ObjectMeta: meta,
},
}
a.logger.Info("Component is being deleted", "component", "cert-broker", "namespace", namespace)
for _, obj := range objects {
if err := a.client.Delete(ctx, obj); err != nil && !apierrors.IsNotFound(err) {
return err
}
}
return nil
}
func (a *actuator) createRBAC(ctx context.Context, config *rest.Config) error {
applier, err := kubernetes.NewChartApplierForConfig(config)
if err != nil {
return fmt.Errorf("failed to create chart applier: %v", err)
}
a.logger.Info("Manifests are being applied")
if err := applier.ApplyChart(ctx, filepath.Join(utils.ChartsPath, "cert-broker-rbac"), "", "", nil, nil); err != nil {
return fmt.Errorf("error applying manifests: %v", err)
}
return nil
}
func (a *actuator) deleteRBAC(ctx context.Context, config *rest.Config) error {
meta := metav1.ObjectMeta{
Name: utils.RBACResourceName,
}
objects := []runtime.Object{
&rbacv1.ClusterRole{
ObjectMeta: meta,
},
&rbacv1.ClusterRoleBinding{
ObjectMeta: meta,
},
}
targetClient, err := client.New(config, client.Options{})
if err != nil {
return fmt.Errorf("Cannot create client for target cluster to delete RBAC manifests: %v", err)
}
for _, obj := range objects {
if err := targetClient.Delete(ctx, obj); err != nil && !apierrors.IsNotFound(err) {
return err
}
}
return nil
}
func (a *actuator) createKubeconfigForCertManager(ctx context.Context, namespace string) (*corev1.Secret, error) {
certConfig := secrets.CertificateSecretConfig{
Name: utils.CertBrokerResourceName,
CommonName: utils.CertBrokerUserName,
}
return util.GetOrCreateShootKubeconfig(ctx, a.client, certConfig, namespace)
}