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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"
"reflect"
"strings"
projConfig "github.com/javamachr/gardener-extension-shoot-fleet-agent/pkg/apis/config"
"github.com/gardener/gardener/pkg/apis/core/v1beta1"
"github.com/gardener/gardener/pkg/extensions"
"github.com/go-logr/logr"
fleetv1alpha1 "github.com/rancher/fleet/pkg/apis/fleet.cattle.io/v1alpha1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/client-go/rest"
"k8s.io/client-go/util/retry"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/log"
"github.com/gardener/gardener/extensions/pkg/controller"
"github.com/gardener/gardener/extensions/pkg/controller/extension"
"github.com/javamachr/gardener-extension-shoot-fleet-agent/pkg/controller/config"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// ActuatorName is the name of the Fleet agent actuator.
const ActuatorName = "shoot-fleet-agent-actuator"
// KubeconfigSecretName name of secret that holds kubeconfig for Shoot
const KubeconfigSecretName = "kubecfg"
// KubeconfigKey key in KubeconfigSecretName secret that holds kubeconfig for Shoot
const KubeconfigKey = "kubeconfig"
// DefaultConfigKey is the name of default config key.
const DefaultConfigKey = "default"
// NewActuator returns an actuator responsible for Extension resources.
func NewActuator(config config.Config) extension.Actuator {
logger := log.Log.WithName(ActuatorName)
fleetManagers := initializeFleetManagers(config, logger)
return &actuator{
logger: logger,
serviceConfig: config,
fleetManagers: fleetManagers,
}
}
type actuator struct {
client client.Client
config *rest.Config
decoder runtime.Decoder
fleetManagers map[string]*FleetManager
serviceConfig config.Config
logger logr.Logger
}
// initializeFleetManagers initializes fleet managers for given config
func initializeFleetManagers(config config.Config, logger logr.Logger) map[string]*FleetManager {
fleetManagers := make(map[string]*FleetManager)
fleetManagers[DefaultConfigKey] = createFleetManager(config.DefaultConfiguration, logger)
for name, projConfig := range config.ProjectConfiguration {
fleetManagers[name] = createFleetManager(projConfig, logger)
}
return fleetManagers
}
// Reconcile the Extension resource.
func (a *actuator) Reconcile(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
namespace := ex.GetNamespace()
a.logger.Info("Component is being reconciled", "component", "fleet-agent-management", "namespace", namespace)
cluster, err := controller.GetCluster(ctx, a.client, namespace)
if err != nil {
return err
}
if isShootedSeedCluster(cluster) {
return a.updateStatus(ctx, ex)
}
shootsConfigOverride := &config.Config{}
if ex.Spec.ProviderConfig != nil { //parse providerConfig defaults override for this Shoot
if _, _, err := a.decoder.Decode(ex.Spec.ProviderConfig.Raw, nil, shootsConfigOverride); err != nil {
return fmt.Errorf("failed to decode provider config: %+v", err)
}
}
a.ReconcileClusterInFleetManager(ctx, namespace, cluster, shootsConfigOverride)
return a.updateStatus(ctx, ex)
}
// Delete the Extension resource.
func (a *actuator) Delete(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
namespace := ex.GetNamespace()
cluster, err := controller.GetCluster(ctx, a.client, namespace)
if err != nil {
return err
}
if isShootedSeedCluster(cluster) {
return nil
}
a.logger.Info("Component is being deleted", "component", "fleet-agent-management", "namespace", namespace, "cluster", buildCrdName(cluster))
err = a.getFleetManager(cluster).DeleteKubeconfigSecret(ctx, buildCrdName(cluster))
if err != nil {
a.logger.Error(err, "Failed to delete kubeconfig secret for Shoot cluster.", "cluster", buildCrdName(cluster))
}
err = a.getFleetManager(cluster).DeleteCluster(ctx, buildCrdName(cluster))
if err != nil {
a.logger.Error(err, "Failed to delete Cluster registration for Shoot cluster.", "cluster", buildCrdName(cluster))
}
return nil
}
// Restore the Extension resource.
func (a *actuator) Restore(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
//NOOP as there are no resources by this controller in Seed
return nil
}
// Migrate the Extension resource.
func (a *actuator) Migrate(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
//NOOP as there are no resources by this controller in Seed
return nil
}
// InjectConfig injects the rest config to this actuator.
func (a *actuator) InjectConfig(config *rest.Config) error {
a.config = config
return nil
}
// InjectClient injects the controller runtime client into the reconciler.
func (a *actuator) InjectClient(client client.Client) error {
a.client = client
return nil
}
// InjectScheme injects the given scheme into the reconciler.
func (a *actuator) InjectScheme(scheme *runtime.Scheme) error {
a.decoder = serializer.NewCodecFactory(scheme).UniversalDecoder()
return nil
}
// ReconcileClusterInFleetManager reconciles cluster registration in remote fleet manager
func (a *actuator) ReconcileClusterInFleetManager(ctx context.Context, namespace string, cluster *extensions.Cluster, override *config.Config) {
a.logger.Info("Starting with already registered check")
labels := prepareLabels(cluster, getProjectConfig(cluster, &a.serviceConfig), getProjectConfig(cluster, override))
registered, err := a.getFleetManager(cluster).GetCluster(ctx, cluster.Shoot.Name)
if err != nil {
a.logger.Error(err, "Failed to get cluster registration for Shoot", "shoot", cluster.Shoot.Name)
}
if err == nil && registered != nil {
if reflect.DeepEqual(registered.Labels, labels) {
a.logger.Info("Cluster already registered - skipping registration", "clientId", registered.Spec.ClientID)
} else {
a.logger.Info("Updating labels of already registered cluster.", "clientId", registered.Spec.ClientID)
a.updateClusterLabelsInFleet(ctx, registered, cluster, labels)
}
return
}
a.registerNewClusterInFleet(ctx, namespace, cluster, labels)
}
func (a *actuator) updateClusterLabelsInFleet(ctx context.Context, clusterRegistration *fleetv1alpha1.Cluster, cluster *extensions.Cluster, labels map[string]string) {
clusterRegistration.Labels = labels
_, err := a.getFleetManager(cluster).UpdateCluster(ctx, clusterRegistration)
if err != nil {
a.logger.Error(err, "Failed to update cluster labels in Fleet registration.", "clusterName", clusterRegistration.Name)
}
}
func (a *actuator) registerNewClusterInFleet(ctx context.Context, namespace string, cluster *extensions.Cluster, labels map[string]string) {
a.logger.Info("Looking up Secret with KubeConfig for given Shoot.", "namespace", namespace, "secretName", KubeconfigSecretName)
secret := &corev1.Secret{}
if err := a.client.Get(ctx, kutil.Key(namespace, KubeconfigSecretName), secret); err == nil {
secretData := make(map[string][]byte)
secretData["value"] = secret.Data[KubeconfigKey]
a.logger.Info("Loaded kubeconfig from secret", "kubeconfig", secret, "namespace", namespace)
const fleetRegisterNamespace = "clusters"
kubeconfigSecret := corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "kubecfg-" + buildCrdName(cluster),
Namespace: fleetRegisterNamespace,
},
Data: secretData,
}
clusterRegistration := fleetv1alpha1.Cluster{
TypeMeta: metav1.TypeMeta{},
ObjectMeta: metav1.ObjectMeta{
Name: buildCrdName(cluster),
Namespace: fleetRegisterNamespace,
Labels: labels,
},
Spec: fleetv1alpha1.ClusterSpec{
KubeConfigSecret: "kubecfg-" + buildCrdName(cluster),
},
}
if _, err = a.getFleetManager(cluster).CreateKubeconfigSecret(ctx, &kubeconfigSecret); err != nil {
a.logger.Error(err, "Failed to create secret with kubeconfig for Fleet registration")
}
if _, err = a.getFleetManager(cluster).CreateCluster(ctx, &clusterRegistration); err != nil {
a.logger.Error(err, "Failed to create Cluster for Fleet registration")
}
a.logger.Info("Registered shoot cluster in Fleet Manager ", "registration", clusterRegistration)
} else {
a.logger.Error(err, "Failed to find Secret with kubeconfig for Fleet registration.")
}
}
func prepareLabels(cluster *extensions.Cluster, serviceConfig projConfig.ProjectConfig, override projConfig.ProjectConfig) map[string]string {
labels := make(map[string]string)
labels["corebundle"] = "true"
labels["region"] = cluster.Shoot.Spec.Region
labels["cluster"] = cluster.Shoot.Name
labels["seed"] = cluster.Seed.Name
if len(override.Labels) > 0 { //adds labels from Shoot configuration
for key, value := range override.Labels {
labels[key] = value
}
} else {
if len(serviceConfig.Labels) > 0 { //adds labels from default configuration
for key, value := range serviceConfig.Labels {
labels[key] = value
}
}
}
return labels
}
func (a *actuator) updateStatus(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
return controller.TryUpdateStatus(ctx, retry.DefaultBackoff, a.client, ex, func() error {
return nil
})
}
func (a *actuator) getFleetManager(cluster *extensions.Cluster) *FleetManager {
manager, present := a.fleetManagers[getProjectName(cluster)]
if !present {
return a.fleetManagers[DefaultConfigKey]
}
return manager
}
// getProjectConfig return project specific or default config
func getProjectConfig(cluster *extensions.Cluster, serviceConfig *config.Config) projConfig.ProjectConfig {
name := getProjectName(cluster)
projectConfig, present := serviceConfig.ProjectConfiguration[name]
if !present {
return serviceConfig.DefaultConfiguration
}
return projectConfig
}
// buildCrdName creates a unique name for cluster registration resources in Fleet manager cluster
func buildCrdName(cluster *extensions.Cluster) string {
return cluster.Seed.Name + "" + cluster.Shoot.Name
}
// isShootedSeedCluster checks if clusters purpose is Infrastructure
func isShootedSeedCluster(cluster *extensions.Cluster) bool {
return *cluster.Shoot.Spec.Purpose == v1beta1.ShootPurposeInfrastructure
}
// getProjectName extracts project name from Shoots namespace
func getProjectName(cluster *extensions.Cluster) string {
return cluster.Shoot.Namespace[strings.LastIndex(cluster.Shoot.Namespace, "-")+1:]
}