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actuator.go
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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 controller
import (
"context"
"fmt"
"path/filepath"
"time"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
gardencorev1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
controllerconfig "github.com/gardener/gardener-extension-shoot-dns-service/pkg/controller/config"
"github.com/gardener/gardener-extension-shoot-dns-service/pkg/imagevector"
"github.com/gardener/gardener-extension-shoot-dns-service/pkg/service"
"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"
"github.com/gardener/gardener/pkg/chartrenderer"
"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"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/client-go/rest"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/log"
)
const (
// ActuatorName is the name of the DNS Service actuator.
ActuatorName = service.ServiceName + "-actuator"
// SeedResourcesName is the name for resource describing the resources applied to the seed cluster.
SeedResourcesName = service.ExtensionServiceName + "-seed"
// ShootResourcesName is the name for resource describing the resources applied to the shoot cluster.
ShootResourcesName = service.ExtensionServiceName + "-shoot"
// KeptShootResourcesName is the name for resource describing the resources applied to the shoot cluster that should not be deleted.
KeptShootResourcesName = service.ExtensionServiceName + "-shoot-keep"
)
// NewActuator returns an actuator responsible for Extension resources.
func NewActuator(config controllerconfig.DNSServiceConfig) extension.Actuator {
return &actuator{
logger: log.Log.WithName(ActuatorName),
controllerConfig: config,
}
}
type actuator struct {
applier kubernetes.ChartApplier
renderer chartrenderer.Interface
client client.Client
config *rest.Config
controllerConfig controllerconfig.DNSServiceConfig
logger logr.Logger
}
// 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
renderer, err := chartrenderer.NewForConfig(a.config)
if err != nil {
return fmt.Errorf("failed to create chart renderer: %v", err)
}
a.renderer = renderer
return nil
}
// InjectClient injects the controller runtime client into the reconciler.
func (a *actuator) InjectClient(client client.Client) error {
a.client = client
return nil
}
// Reconcile the Extension resource.
func (a *actuator) Reconcile(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
cluster, err := controller.GetCluster(ctx, a.client, ex.Namespace)
if err != nil {
return err
}
// Shoots that don't specify a DNS domain or that are scheduled to a seed that is tainted with "DNS disabled"
// don't get an DNS service
if gardencorev1beta1helper.TaintsHave(cluster.Seed.Spec.Taints, gardencorev1beta1.SeedTaintDisableDNS) ||
cluster.Shoot.Spec.DNS == nil {
a.logger.Info("DNS domain is not specified or the seed is tainted with 'disable-dns', therefore no shoot dns service is installed", "shoot", ex.Namespace)
return a.Delete(ctx, ex)
}
if err := a.createShootResources(ctx, cluster, ex.Namespace); err != nil {
return err
}
return a.createSeedResources(ctx, cluster, ex.Namespace)
}
// Delete the Extension resource.
func (a *actuator) Delete(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
if err := a.deleteSeedResources(ctx, ex.Namespace); err != nil {
return err
}
return a.deleteShootResources(ctx, ex.Namespace)
}
func (a *actuator) shootId(namespace string) string {
return fmt.Sprintf("%s.gardener.cloud/%s", a.controllerConfig.GardenID, namespace)
}
func (a *actuator) createSeedResources(ctx context.Context, cluster *controller.Cluster, namespace string) error {
shootKubeconfig, err := a.createKubeconfig(ctx, namespace)
if err != nil {
return err
}
chartValues := map[string]interface{}{
"serviceName": service.ServiceName,
"replicas": controller.GetReplicas(cluster, 1),
"targetClusterSecret": shootKubeconfig.GetName(),
"gardenId": a.controllerConfig.GardenID,
"shootId": a.shootId(namespace),
"seedId": a.controllerConfig.SeedID,
"dnsClass": a.controllerConfig.DNSClass,
"podAnnotations": map[string]interface{}{
"checksum/secret-kubeconfig": util.ComputeChecksum(shootKubeconfig.Data),
},
}
chartValues, err = chart.InjectImages(chartValues, imagevector.ImageVector(), []string{service.ImageName})
if err != nil {
return fmt.Errorf("failed to find image version for %s: %v", service.ImageName, err)
}
a.logger.Info("Component is being applied", "component", service.ExtensionServiceName, "namespace", namespace)
return a.createManagedResource(ctx, namespace, SeedResourcesName, "seed", a.renderer, service.SeedChartName, chartValues, nil)
}
func (a *actuator) deleteSeedResources(ctx context.Context, namespace string) error {
a.logger.Info("Component is being deleted", "component", service.ExtensionServiceName, "namespace", namespace)
if err := controller.DeleteManagedResource(ctx, a.client, namespace, SeedResourcesName); err != nil {
return err
}
timeoutCtx, cancel := context.WithTimeout(ctx, 2*time.Minute)
defer cancel()
if err := controller.WaitUntilManagedResourceDeleted(timeoutCtx, a.client, namespace, SeedResourcesName); err != nil {
return err
}
secret := &corev1.Secret{}
secret.SetName(service.SecretName)
secret.SetNamespace(namespace)
if err := a.client.Delete(ctx, secret); client.IgnoreNotFound(err) != nil {
return err
}
shootId := a.shootId(namespace)
list := &unstructured.UnstructuredList{}
list.SetAPIVersion("dns.gardener.cloud/v1alpha1")
list.SetKind("DNSEntry")
if err := a.client.List(ctx, list, client.InNamespace(namespace), client.MatchingLabels(map[string]string{shootId: "true"})); err != nil {
return nil
}
for _, item := range list.Items {
if err := a.client.Delete(ctx, &item); client.IgnoreNotFound(err) != nil {
return err
}
}
return nil
}
func (a *actuator) createShootResources(ctx context.Context, cluster *controller.Cluster, namespace string) error {
crd := &unstructured.Unstructured{}
crd.SetAPIVersion("apiextensions.k8s.io/v1beta1")
crd.SetKind("CustomResourceDefinition")
if err := a.client.Get(ctx, client.ObjectKey{Name: "dnsentries.dns.gardener.cloud"}, crd); err != nil {
return errors.Wrap(err, "could not get crd dnsentries.dns.gardener.cloud")
}
crd.SetResourceVersion("")
crd.SetUID("")
crd.SetCreationTimestamp(metav1.Time{})
crd.SetGeneration(0)
if err := controller.CreateManagedResourceFromUnstructured(ctx, a.client, namespace, KeptShootResourcesName, "", []*unstructured.Unstructured{crd}, true, nil); err != nil {
return errors.Wrapf(err, "could not create managed resource %s", KeptShootResourcesName)
}
renderer, err := util.NewChartRendererForShoot(cluster.Shoot.Spec.Kubernetes.Version)
if err != nil {
return errors.Wrap(err, "could not create chart renderer")
}
chartValues := map[string]interface{}{
"userName": service.UserName,
"serviceName": service.ServiceName,
}
injectedLabels := map[string]string{controller.ShootNoCleanupLabel: "true"}
return a.createManagedResource(ctx, namespace, ShootResourcesName, "", renderer, service.ShootChartName, chartValues, injectedLabels)
}
func (a *actuator) deleteShootResources(ctx context.Context, namespace string) error {
if err := controller.DeleteManagedResource(ctx, a.client, namespace, ShootResourcesName); err != nil {
return err
}
if err := controller.DeleteManagedResource(ctx, a.client, namespace, KeptShootResourcesName); err != nil {
return err
}
timeoutCtx1, cancel := context.WithTimeout(ctx, 2*time.Minute)
defer cancel()
if err := controller.WaitUntilManagedResourceDeleted(timeoutCtx1, a.client, namespace, ShootResourcesName); err != nil {
return err
}
timeoutCtx2, cancel := context.WithTimeout(ctx, 2*time.Minute)
defer cancel()
return controller.WaitUntilManagedResourceDeleted(timeoutCtx2, a.client, namespace, KeptShootResourcesName)
}
func (a *actuator) createKubeconfig(ctx context.Context, namespace string) (*corev1.Secret, error) {
certConfig := secrets.CertificateSecretConfig{
Name: service.SecretName,
CommonName: service.UserName,
}
return util.GetOrCreateShootKubeconfig(ctx, a.client, certConfig, namespace)
}
func (a *actuator) createManagedResource(ctx context.Context, namespace, name, class string, renderer chartrenderer.Interface, chartName string, chartValues map[string]interface{}, injectedLabels map[string]string) error {
return controller.CreateManagedResourceFromFileChart(
ctx, a.client, namespace, name, class,
renderer, filepath.Join(service.ChartsPath, chartName), chartName,
chartValues, injectedLabels,
)
}