/
clusteridentity.go
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/
clusteridentity.go
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// Copyright 2021 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 clusteridentity
import (
"context"
"fmt"
"time"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/utils/ptr"
"sigs.k8s.io/controller-runtime/pkg/client"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/component"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/managedresources"
)
const (
// ManagedResourceControlName is the name of the ManagedResource containing the resource specifications.
ManagedResourceControlName = "cluster-identity"
// ShootManagedResourceName is the name of the ManagedResource containing the resource specifications.
ShootManagedResourceName = "shoot-core-" + ManagedResourceControlName
)
// Interface contains functions for managing cluster identities.
type Interface interface {
component.DeployWaiter
SetIdentity(string)
}
type clusterIdentity struct {
client client.Client
namespace string
identity string
identityType string
managedResourceName string
managedResourceDeleteFn func(ctx context.Context, client client.Client, namespace string, name string) error
}
func newComponent(
c client.Client,
namespace string,
identity string,
identityType string,
managedResourceName string,
managedResourceDeleteFn func(ctx context.Context, client client.Client, namespace string, name string) error,
) Interface {
return &clusterIdentity{
client: c,
namespace: namespace,
identity: identity,
identityType: identityType,
managedResourceName: managedResourceName,
managedResourceDeleteFn: managedResourceDeleteFn,
}
}
// NewForSeed creates new instance of Deployer for the seed's cluster identity.
func NewForSeed(c client.Client, namespace, identity string) Interface {
return newComponent(
c,
namespace,
identity,
v1beta1constants.ClusterIdentityOriginSeed,
ManagedResourceControlName,
managedresources.DeleteForSeed,
)
}
// NewForShoot creates new instance of Deployer for the shoot's cluster identity.
func NewForShoot(c client.Client, namespace, identity string) Interface {
return newComponent(
c,
namespace,
identity,
v1beta1constants.ClusterIdentityOriginShoot,
ShootManagedResourceName,
managedresources.DeleteForShoot,
)
}
func (c *clusterIdentity) Deploy(ctx context.Context) error {
configMap := &corev1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Name: v1beta1constants.ClusterIdentity,
Namespace: metav1.NamespaceSystem,
},
Immutable: ptr.To(true),
Data: map[string]string{
v1beta1constants.ClusterIdentity: c.identity,
v1beta1constants.ClusterIdentityOrigin: c.identityType,
},
}
var registry *managedresources.Registry
if c.identityType == v1beta1constants.ClusterIdentityOriginShoot {
registry = managedresources.NewRegistry(kubernetes.ShootScheme, kubernetes.ShootCodec, kubernetes.ShootSerializer)
} else {
registry = managedresources.NewRegistry(kubernetes.SeedScheme, kubernetes.SeedCodec, kubernetes.SeedSerializer)
}
resources, err := registry.AddAllAndSerialize(configMap)
if err != nil {
return err
}
switch c.identityType {
case v1beta1constants.ClusterIdentityOriginShoot:
return managedresources.CreateForShoot(ctx, c.client, c.namespace, c.managedResourceName, managedresources.LabelValueGardener, false, resources)
case v1beta1constants.ClusterIdentityOriginSeed:
return managedresources.CreateForSeed(ctx, c.client, c.namespace, c.managedResourceName, false, resources)
default:
// this should never happen
return fmt.Errorf("unknown cluster identity type %s", c.identityType)
}
}
func (c *clusterIdentity) Destroy(ctx context.Context) error {
return c.managedResourceDeleteFn(ctx, c.client, c.namespace, c.managedResourceName)
}
func (c *clusterIdentity) SetIdentity(identity string) {
c.identity = identity
}
// TimeoutWaitForManagedResource is the timeout used while waiting for the ManagedResources to become healthy
// or deleted.
var TimeoutWaitForManagedResource = 2 * time.Minute
func (c *clusterIdentity) Wait(ctx context.Context) error {
timeoutCtx, cancel := context.WithTimeout(ctx, TimeoutWaitForManagedResource)
defer cancel()
return managedresources.WaitUntilHealthy(timeoutCtx, c.client, c.namespace, c.managedResourceName)
}
func (c *clusterIdentity) WaitCleanup(ctx context.Context) error {
timeoutCtx, cancel := context.WithTimeout(ctx, TimeoutWaitForManagedResource)
defer cancel()
return managedresources.WaitUntilDeleted(timeoutCtx, c.client, c.namespace, c.managedResourceName)
}
// IsClusterIdentityEmptyOrFromOrigin checks if the cluster-identity config map does not exist or is from the same origin
func IsClusterIdentityEmptyOrFromOrigin(ctx context.Context, c client.Client, origin string) (bool, error) {
clusterIdentity := &corev1.ConfigMap{}
if err := c.Get(ctx, kubernetesutils.Key(metav1.NamespaceSystem, v1beta1constants.ClusterIdentity), clusterIdentity); err != nil {
if apierrors.IsNotFound(err) {
return true, nil
}
return false, err
}
return clusterIdentity.Data[v1beta1constants.ClusterIdentityOrigin] == origin || clusterIdentity.Data[v1beta1constants.ClusterIdentityOrigin] == "", nil
}