forked from gardener-attic/gardener-extensions
/
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 genericactuator
import (
"context"
extensionscontroller "github.com/gardener/gardener-extensions/pkg/controller"
"github.com/gardener/gardener-extensions/pkg/controller/controlplane"
"github.com/gardener/gardener-extensions/pkg/util"
gardencorev1alpha1 "github.com/gardener/gardener/pkg/apis/core/v1alpha1"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
gardenerkubernetes "github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/utils/imagevector"
"github.com/go-logr/logr"
"github.com/pkg/errors"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
)
// ValuesProvider provides values for the 2 charts applied by this actuator.
type ValuesProvider interface {
// GetConfigChartValues returns the values for the config chart applied by this actuator.
GetConfigChartValues(context.Context, *extensionsv1alpha1.ControlPlane, *extensionscontroller.Cluster) (map[string]interface{}, error)
// GetControlPlaneChartValues returns the values for the control plane chart applied by this actuator.
GetControlPlaneChartValues(context.Context, *extensionsv1alpha1.ControlPlane, *extensionscontroller.Cluster, map[string]string, bool) (map[string]interface{}, error)
// GetControlPlaneShootChartValues returns the values for the control plane shoot chart applied by this actuator.
GetControlPlaneShootChartValues(context.Context, *extensionsv1alpha1.ControlPlane, *extensionscontroller.Cluster) (map[string]interface{}, error)
// GetStorageClassesChartValues returns the values for the storage classes chart applied by this actuator.
GetStorageClassesChartValues(context.Context, *extensionsv1alpha1.ControlPlane, *extensionscontroller.Cluster) (map[string]interface{}, error)
}
// NewActuator creates a new Actuator that acts upon and updates the status of ControlPlane resources.
// It creates / deletes the given secrets and applies / deletes the given charts, using the given image vector and
// the values provided by the given values provider.
func NewActuator(
secrets util.Secrets,
configChart, controlPlaneChart, controlPlaneShootChart, storageClassesChart util.Chart,
vp ValuesProvider,
chartRendererFactory extensionscontroller.ChartRendererFactory,
imageVector imagevector.ImageVector,
configName string,
logger logr.Logger,
) controlplane.Actuator {
return &actuator{
secrets: secrets,
configChart: configChart,
controlPlaneChart: controlPlaneChart,
controlPlaneShootChart: controlPlaneShootChart,
storageClassesChart: storageClassesChart,
vp: vp,
chartRendererFactory: chartRendererFactory,
imageVector: imageVector,
configName: configName,
logger: logger.WithName("controlplane-actuator"),
}
}
// actuator is an Actuator that acts upon and updates the status of ControlPlane resources.
type actuator struct {
secrets util.Secrets
configChart util.Chart
controlPlaneChart util.Chart
controlPlaneShootChart util.Chart
storageClassesChart util.Chart
vp ValuesProvider
chartRendererFactory extensionscontroller.ChartRendererFactory
imageVector imagevector.ImageVector
configName string
clientset kubernetes.Interface
gardenerClientset gardenerkubernetes.Interface
chartApplier gardenerkubernetes.ChartApplier
client client.Client
logger logr.Logger
}
// InjectFunc enables injecting Kubernetes dependencies into actuator's dependencies.
func (a *actuator) InjectFunc(f inject.Func) error {
return f(a.vp)
}
// InjectConfig injects the given config into the actuator.
func (a *actuator) InjectConfig(config *rest.Config) error {
// Create clientset
var err error
a.clientset, err = kubernetes.NewForConfig(config)
if err != nil {
return errors.Wrap(err, "could not create Kubernetes client")
}
// Create Gardener clientset
a.gardenerClientset, err = gardenerkubernetes.NewForConfig(config, client.Options{})
if err != nil {
return errors.Wrap(err, "could not create Gardener client")
}
// Create chart applier
a.chartApplier, err = gardenerkubernetes.NewChartApplierForConfig(config)
if err != nil {
return errors.Wrap(err, "could not create chart applier")
}
return nil
}
// InjectClient injects the given client into the valuesProvider.
func (a *actuator) InjectClient(client client.Client) error {
a.client = client
return nil
}
const (
controlPlaneShootChartResourceName = "extension-controlplane-shoot"
storageClassesChartResourceName = "extension-controlplane-storageclasses"
)
// Reconcile reconciles the given controlplane and cluster, creating or updating the additional Shoot
// control plane components as needed.
func (a *actuator) Reconcile(
ctx context.Context,
cp *extensionsv1alpha1.ControlPlane,
cluster *extensionscontroller.Cluster,
) (bool, error) {
// Deploy secrets
a.logger.Info("Deploying secrets", "controlplane", util.ObjectName(cp))
deployedSecrets, err := a.secrets.Deploy(a.clientset, a.gardenerClientset, cp.Namespace)
if err != nil {
return false, errors.Wrapf(err, "could not deploy secrets for controlplane '%s'", util.ObjectName(cp))
}
// Get config chart values
if a.configChart != nil {
values, err := a.vp.GetConfigChartValues(ctx, cp, cluster)
if err != nil {
return false, err
}
// Apply config chart
a.logger.Info("Applying configuration chart", "controlplane", util.ObjectName(cp))
if err := a.configChart.Apply(ctx, a.chartApplier, cp.Namespace, nil, "", "", values); err != nil {
return false, errors.Wrapf(err, "could not apply configuration chart for controlplane '%s'", util.ObjectName(cp))
}
}
// Compute all needed checksums
checksums, err := a.computeChecksums(ctx, deployedSecrets, cp.Namespace)
if err != nil {
return false, err
}
// If the cluster is hibernated, check if kube-apiserver has been already scaled down
requeue := false
scaledDown := false
if extensionscontroller.IsHibernated(cluster.Shoot) {
dep := &appsv1.Deployment{}
if err := a.client.Get(ctx, client.ObjectKey{Namespace: cp.Namespace, Name: gardencorev1alpha1.DeploymentNameKubeAPIServer}, dep); err != nil {
return false, errors.Wrapf(err, "could not get deployment '%s/%s'", cp.Namespace, gardencorev1alpha1.DeploymentNameKubeAPIServer)
}
// If kube-apiserver has not been already scaled down, requeue. Otherwise, set the scaledDown flag so the value provider could scale CCM down.
if dep.Spec.Replicas != nil && *dep.Spec.Replicas > 0 {
requeue = true
} else {
scaledDown = true
}
}
// Get control plane chart values
values, err := a.vp.GetControlPlaneChartValues(ctx, cp, cluster, checksums, scaledDown)
if err != nil {
return false, err
}
// Apply control plane chart
a.logger.Info("Applying control plane chart", "controlplane", util.ObjectName(cp))
if err := a.controlPlaneChart.Apply(ctx, a.chartApplier, cp.Namespace, a.imageVector, a.gardenerClientset.Version(), cluster.Shoot.Spec.Kubernetes.Version, values); err != nil {
return false, errors.Wrapf(err, "could not apply control plane chart for controlplane '%s'", util.ObjectName(cp))
}
// Create shoot chart renderer
chartRenderer, err := a.chartRendererFactory.NewChartRendererForShoot(cluster.Shoot.Spec.Kubernetes.Version)
if err != nil {
return false, errors.Wrapf(err, "could not create chart renderer for shoot '%s'", cp.Namespace)
}
// Get control plane shoot chart values
values, err = a.vp.GetControlPlaneShootChartValues(ctx, cp, cluster)
if err != nil {
return false, err
}
if err := extensionscontroller.RenderChartAndCreateManagedResource(ctx, cp.Namespace, controlPlaneShootChartResourceName, a.client, chartRenderer, a.controlPlaneShootChart, values, a.imageVector, metav1.NamespaceSystem, cluster.Shoot.Spec.Kubernetes.Version, true); err != nil {
return false, errors.Wrapf(err, "could not apply control plane shoot chart for controlplane '%s'", util.ObjectName(cp))
}
// Get storage classes
values, err = a.vp.GetStorageClassesChartValues(ctx, cp, cluster)
if err != nil {
return false, err
}
if err := extensionscontroller.RenderChartAndCreateManagedResource(ctx, cp.Namespace, storageClassesChartResourceName, a.client, chartRenderer, a.storageClassesChart, values, a.imageVector, metav1.NamespaceSystem, cluster.Shoot.Spec.Kubernetes.Version, true); err != nil {
return false, errors.Wrapf(err, "could not apply storage classes chart for controlplane '%s'", util.ObjectName(cp))
}
return requeue, nil
}
// Delete reconciles the given controlplane and cluster, deleting the additional Shoot
// control plane components as needed.
func (a *actuator) Delete(
ctx context.Context,
cp *extensionsv1alpha1.ControlPlane,
cluster *extensionscontroller.Cluster,
) error {
// Delete the managed resources
if err := extensionscontroller.DeleteManagedResource(ctx, a.client, cp.Namespace, storageClassesChartResourceName); err != nil {
return errors.Wrapf(err, "could not delete managed resource containing storage classes chart for controlplane '%s'", util.ObjectName(cp))
}
if err := extensionscontroller.DeleteManagedResource(ctx, a.client, cp.Namespace, controlPlaneShootChartResourceName); err != nil {
return errors.Wrapf(err, "could not delete managed resource containing shoot chart for controlplane '%s'", util.ObjectName(cp))
}
// Delete control plane objects
a.logger.Info("Deleting control plane objects", "controlplane", util.ObjectName(cp))
if err := a.controlPlaneChart.Delete(ctx, a.client, cp.Namespace); err != nil {
return errors.Wrapf(err, "could not delete control plane objects for controlplane '%s'", util.ObjectName(cp))
}
if a.configChart != nil {
// Delete config objects
a.logger.Info("Deleting configuration objects", "controlplane", util.ObjectName(cp))
if err := a.configChart.Delete(ctx, a.client, cp.Namespace); err != nil {
return errors.Wrapf(err, "could not delete configuration objects for controlplane '%s'", util.ObjectName(cp))
}
}
// Delete secrets
a.logger.Info("Deleting secrets", "controlplane", util.ObjectName(cp))
if err := a.secrets.Delete(a.clientset, cp.Namespace); err != nil {
return errors.Wrapf(err, "could not delete secrets for controlplane '%s'", util.ObjectName(cp))
}
return nil
}
// computeChecksums computes and returns all needed checksums. This includes the checksums for the given deployed secrets,
// as well as the cloud provider secret and configmap that are fetched from the cluster.
func (a *actuator) computeChecksums(
ctx context.Context,
deployedSecrets map[string]*corev1.Secret,
namespace string,
) (map[string]string, error) {
// Get cloud provider secret and config from cluster
cpSecret := &corev1.Secret{}
if err := a.client.Get(ctx, client.ObjectKey{Namespace: namespace, Name: gardencorev1alpha1.SecretNameCloudProvider}, cpSecret); err != nil {
return nil, errors.Wrapf(err, "could not get secret '%s/%s'", namespace, gardencorev1alpha1.SecretNameCloudProvider)
}
csSecrets := controlplane.MergeSecretMaps(deployedSecrets, map[string]*corev1.Secret{
gardencorev1alpha1.SecretNameCloudProvider: cpSecret,
})
var csConfigMaps map[string]*corev1.ConfigMap
if len(a.configName) != 0 {
cpConfigMap := &corev1.ConfigMap{}
if err := a.client.Get(ctx, client.ObjectKey{Namespace: namespace, Name: a.configName}, cpConfigMap); err != nil {
return nil, errors.Wrapf(err, "could not get configmap '%s/%s'", namespace, a.configName)
}
csConfigMaps = map[string]*corev1.ConfigMap{
a.configName: cpConfigMap,
}
}
return controlplane.ComputeChecksums(csSecrets, csConfigMaps), nil
}