forked from gardener-attic/gardener-extensions
/
shoot.go
133 lines (114 loc) · 4.84 KB
/
shoot.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 util
import (
"context"
"fmt"
gardencorev1alpha1 "github.com/gardener/gardener/pkg/apis/core/v1alpha1"
gardenv1beta1 "github.com/gardener/gardener/pkg/apis/garden/v1beta1"
"github.com/gardener/gardener/pkg/operation/common"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/secrets"
"github.com/Masterminds/semver"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// CAChecksumAnnotation is a resource annotation used to store the checksum of a certificate authority.
const CAChecksumAnnotation = "checksum/ca"
// GetGardenerSecret gets the secret from the given namespace which contains certificate information
// as well as the Kubeconfig for a Shoot cluster.
func GetGardenerSecret(ctx context.Context, client client.Client, namespace string) (*corev1.Secret, error) {
secret := &corev1.Secret{}
if err := client.Get(ctx, kutil.Key(namespace, gardencorev1alpha1.SecretNameGardener), secret); err != nil {
return nil, err
}
return secret, nil
}
// GetOrCreateShootKubeconfig gets or creates a Kubeconfig for a Shoot cluster which has a running control plane in the given `namespace`.
// If the CA of an existing Kubeconfig has changed, it creates a new Kubeconfig.
// Newly generated Kubeconfigs are applied with the given `client` to the given `namespace`.
func GetOrCreateShootKubeconfig(ctx context.Context, client client.Client, certificateConfig secrets.CertificateSecretConfig, namespace string) (*corev1.Secret, error) {
caSecret, ca, err := secrets.LoadCAFromSecret(client, namespace, gardencorev1alpha1.SecretNameCACluster)
if err != nil {
return nil, fmt.Errorf("error fetching CA secret %s/%s: %v", namespace, gardencorev1alpha1.SecretNameCACluster, err)
}
var (
secret = corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Annotations: make(map[string]string),
Name: certificateConfig.Name,
Namespace: namespace,
},
}
key = types.NamespacedName{
Name: certificateConfig.Name,
Namespace: namespace,
}
)
if err := client.Get(ctx, key, &secret); err != nil && !apierrors.IsNotFound(err) {
return nil, fmt.Errorf("error preparing kubeconfig: %v", err)
}
var (
computedChecksum = ComputeChecksum(caSecret.Data)
storedChecksum, ok = secret.Annotations[CAChecksumAnnotation]
)
if ok && computedChecksum == storedChecksum {
return &secret, nil
}
certificateConfig.SigningCA = ca
certificateConfig.CertType = secrets.ClientCert
config := secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &certificateConfig,
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: namespace,
APIServerURL: kubeAPIServerServiceDNS(namespace),
},
}
controlPlane, err := config.GenerateControlPlane()
if err != nil {
return nil, fmt.Errorf("error creating kubeconfig: %v", err)
}
return &secret, kutil.CreateOrUpdate(ctx, client, &secret, func() error {
secret.Data = controlPlane.SecretData()
if secret.Annotations == nil {
secret.Annotations = make(map[string]string)
}
secret.Annotations[CAChecksumAnnotation] = computedChecksum
return nil
})
}
// KubeAPIServerServiceDNS returns a domain name which can be used to contact
// the Kube-Apiserver deployment of a Shoot within the Seed cluster.
// e.g. kube-apiserver.shoot--project--prod.svc.cluster.local.
func kubeAPIServerServiceDNS(namespace string) string {
return fmt.Sprintf("%s.%s", common.KubeAPIServerDeploymentName, namespace)
}
// GetReplicaCount returns the given replica count base on the hibernation status of the shoot.
func GetReplicaCount(shoot *gardenv1beta1.Shoot, count int) int {
if shoot.Spec.Hibernation != nil && shoot.Spec.Hibernation.Enabled {
return 0
}
return count
}
// VersionMajorMinor extracts and returns the major and the minor part of the given version (input must be a semantic version).
func VersionMajorMinor(version string) (string, error) {
v, err := semver.NewVersion(version)
if err != nil {
return "", err
}
return fmt.Sprintf("%d.%d", v.Major(), v.Minor()), nil
}