Initial v1.0.0 commit

pkg/controller/actuator.go

@@ -0,0 +1,204 @@
+// 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"
+	b64 "encoding/base64"
+	"fmt"
+	"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"
+	"k8s.io/apimachinery/pkg/api/errors"
+	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/tools/clientcmd"
+	"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"
+const KubeconfigSecretName = "kubecfg"
+const KubeconfigKey = "kubeconfig"
+
+// NewActuator returns an actuator responsible for Extension resources.
+func NewActuator(config config.Config) extension.Actuator {
+	fleetKubeConfig, _ := b64.StdEncoding.DecodeString(config.FleetAgentConfig.ClientConnection.Kubeconfig)
+	var kubeconfigPath string
+	var err error
+	if kubeconfigPath, err = writeKubeconfigToTempFile(fleetKubeConfig); err != nil {
+		panic(err)
+	}
+	fleetClientConfig, _ := clientcmd.BuildConfigFromFlags("", kubeconfigPath)
+	fleetManager, err := NewManagerForConfig(fleetClientConfig, "clusters")//TODO get from config
+	if err != nil {
+		panic(err)
+	}
+
+	return &actuator{
+		logger:        log.Log.WithName(ActuatorName),
+		serviceConfig: config,
+		fleetManager: fleetManager,
+	}
+}
+
+type actuator struct {
+	client      client.Client
+	config      *rest.Config
+	decoder     runtime.Decoder
+	fleetManager *FleetManager
+
+	serviceConfig config.Config
+
+	logger logr.Logger
+}
+
+// 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
+	}
+
+	cfg := &config.Config{}
+	if ex.Spec.ProviderConfig != nil {//here we parse providerconfig
+		if _, _, err := a.decoder.Decode(ex.Spec.ProviderConfig.Raw, nil, cfg); err != nil {
+			return fmt.Errorf("failed to decode provider config: %+v", err)
+		}
+	}
+
+	a.registerClusterInFleetManager(ctx, namespace, cluster)
+	return a.updateStatus(ctx, ex)
+}
+
+// Delete the Extension resource.
+func (a *actuator) Delete(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
+	namespace := ex.GetNamespace()
+	a.logger.Info("Component is being deleted", "component", "fleet-agent-management", "namespace", namespace)
+	return nil
+}
+
+// Restore the Extension resource.
+func (a *actuator) Restore(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
+	a.logger.Info("Component is being restored", "component", "fleet-agent-management")
+	return a.Reconcile(ctx, ex)
+}
+
+// Migrate the Extension resource.
+func (a *actuator) Migrate(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
+	a.logger.Info("Component is being migrated", "component", "fleet-agent-management")
+
+	return a.Delete(ctx, ex)
+}
+
+// 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
+}
+
+func (a *actuator) registerClusterInFleetManager(ctx context.Context, namespace string, cluster *extensions.Cluster) {
+	a.logger.Info("Starting with already registered check")
+	registered, err := a.fleetManager.GetCluster(ctx, cluster.Shoot.Name)
+	if !errors.IsNotFound(err) {
+		a.logger.Info("Cluster already registered - skipping registration", "clientId", registered.Spec.ClientID)
+		return
+	} else {
+		a.logger.Info("Cluster registration not found.")
+	}
+	a.logger.Info("Starting cluster registration process")
+	secret := &corev1.Secret{}
+
+	labels := make(map[string]string)
+	labels["corebundle"] = "true"
+	labels["region"] = cluster.Shoot.Spec.Region
+	labels["cluster"] = cluster.Shoot.Name
+	if a.serviceConfig.FleetAgentConfig.Labels != nil && len(a.serviceConfig.FleetAgentConfig.Labels) > 0 {//adds labels from configuration
+		for key, value := range a.serviceConfig.Labels{
+			labels[key] = value
+		}
+	}
+	a.logger.Info("Looking up Secret with KubeConfig for given Shoot.", "namespace", namespace, "secretName", KubeconfigSecretName)
+
+	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-" + cluster.Shoot.Name,
+				Namespace: fleetRegisterNamespace,
+			},
+			Data: secretData,
+		}
+
+		clusterRegistration := fleetv1alpha1.Cluster{
+			TypeMeta: metav1.TypeMeta{},
+			ObjectMeta: metav1.ObjectMeta{
+				Name:      cluster.Shoot.Name,
+				Namespace: fleetRegisterNamespace,
+				Labels:    labels,
+			},
+			Spec: fleetv1alpha1.ClusterSpec{
+				KubeConfigSecret: "kubecfg-" + cluster.Shoot.Name,
+			},
+		}
+		a.logger.Info("Creating kubeconfig secret for Fleet registration.")
+		if _, err = a.fleetManager.CreateKubeconfigSecret(ctx, &kubeconfigSecret); err != nil {
+			a.logger.Error(err, "Failed to create secret with kubeconfig for Fleet registration")
+		}
+		a.logger.Info("Creating Cluster registration for Fleet registration.")
+		if _, err = a.fleetManager.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 (a *actuator) updateStatus(ctx context.Context, ex *extensionsv1alpha1.Extension) error {
+	return controller.TryUpdateStatus(ctx, retry.DefaultBackoff, a.client, ex, func() error {
+		return nil
+	})
+}