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event_logger.go
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event_logger.go
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// Copyright (c) 2022 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 eventlogger
import (
"context"
"errors"
"fmt"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/operation/botanist/component"
"github.com/gardener/gardener/pkg/utils"
gutil "github.com/gardener/gardener/pkg/utils/gardener"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/managedresources"
secretsmanager "github.com/gardener/gardener/pkg/utils/secrets/manager"
appsv1 "k8s.io/api/apps/v1"
autoscalingv1 "k8s.io/api/autoscaling/v1"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
vpaautoscalingv1 "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/apis/autoscaling.k8s.io/v1"
"k8s.io/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
name = "event-logger"
vpaName = "event-logger-vpa"
managedResourceName = "shoot-event-logger"
roleName = "gardener.cloud:logging:event-logger"
)
// Values are the values for the event-logger.
type Values struct {
// Image of the event logger.
Image string
// Replicas is the number of pod replicas.
Replicas int32
}
type eventLogger struct {
client client.Client
namespace string
secretsManager secretsmanager.Interface
values Values
}
// New creates a new instance of event-logger for the shoot event logging.
func New(
client client.Client,
namespace string,
secretsManager secretsmanager.Interface,
values Values,
) (component.Deployer, error) {
if client == nil {
return nil, errors.New("client cannot be nil")
}
if len(namespace) == 0 {
return nil, errors.New("namespace cannot be empty")
}
if len(values.Image) == 0 {
return nil, errors.New("image cannot be empty")
}
if secretsManager == nil {
return nil, errors.New("secret manager cannot be nil")
}
return &eventLogger{
client: client,
namespace: namespace,
secretsManager: secretsManager,
values: values,
}, nil
}
func (l *eventLogger) Deploy(ctx context.Context) error {
if err := l.reconcileRBACForShoot(ctx); err != nil {
return err
}
if err := l.reconcileRBACForSeed(ctx); err != nil {
return err
}
if err := l.reconcileDeployment(ctx); err != nil {
return err
}
return l.reconcileVPA(ctx)
}
func (l *eventLogger) Destroy(ctx context.Context) error {
if err := l.deleteRBACForShoot(ctx); err != nil {
return err
}
return kutil.DeleteObjects(
ctx,
l.client,
l.emptyServiceAccount(),
l.emptyRole(),
l.emptyRoleBinding(),
l.emptyVPA(),
l.emptyDeployment(),
)
}
func (l *eventLogger) reconcileRBACForShoot(ctx context.Context) error {
eventLoggerShootAccessSecret := l.newShootAccessSecret()
if err := eventLoggerShootAccessSecret.Reconcile(ctx, l.client); err != nil {
return err
}
var (
eventLoggerSystemRoleBinding = &rbacv1.RoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: roleName,
Namespace: metav1.NamespaceSystem,
Labels: getLabels(),
},
RoleRef: rbacv1.RoleRef{
APIGroup: rbacv1.GroupName,
Kind: "ClusterRole",
Name: name,
},
Subjects: []rbacv1.Subject{{
Kind: rbacv1.ServiceAccountKind,
Name: eventLoggerShootAccessSecret.ServiceAccountName,
Namespace: metav1.NamespaceSystem,
}},
}
eventLoggerDefaultRoleBinding = &rbacv1.RoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: roleName,
Namespace: metav1.NamespaceDefault,
Labels: getLabels(),
},
RoleRef: rbacv1.RoleRef{
APIGroup: rbacv1.GroupName,
Kind: "ClusterRole",
Name: name,
},
Subjects: []rbacv1.Subject{{
Kind: rbacv1.ServiceAccountKind,
Name: eventLoggerShootAccessSecret.ServiceAccountName,
Namespace: metav1.NamespaceSystem,
}},
}
eventLoggerClusterRole = &rbacv1.ClusterRole{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Labels: getLabels(),
},
Rules: []rbacv1.PolicyRule{
{
APIGroups: []string{
"",
},
Resources: []string{
"events",
},
Verbs: []string{
"get",
"list",
"watch",
},
},
},
}
registry = managedresources.NewRegistry(kubernetes.ShootScheme, kubernetes.ShootCodec, kubernetes.ShootSerializer)
)
resources, err := registry.AddAllAndSerialize(
eventLoggerClusterRole,
eventLoggerSystemRoleBinding,
eventLoggerDefaultRoleBinding,
)
if err != nil {
return err
}
return managedresources.CreateForShoot(ctx, l.client, l.namespace, managedResourceName, false, resources)
}
func (l *eventLogger) reconcileRBACForSeed(ctx context.Context) error {
var (
serviceAccount = l.emptyServiceAccount()
role = l.emptyRole()
roleBinding = l.emptyRoleBinding()
)
if _, err := controllerutils.GetAndCreateOrMergePatch(ctx, l.client, serviceAccount, func() error {
serviceAccount.AutomountServiceAccountToken = pointer.Bool(false)
serviceAccount.Labels = getLabels()
return nil
}); err != nil {
return err
}
if _, err := controllerutils.GetAndCreateOrMergePatch(ctx, l.client, role, func() error {
role.Labels = getLabels()
role.Rules = []rbacv1.PolicyRule{
{
APIGroups: []string{""},
Resources: []string{"events"},
Verbs: []string{"get", "list", "watch"},
},
}
return nil
}); err != nil {
return err
}
_, err := controllerutils.GetAndCreateOrMergePatch(ctx, l.client, roleBinding, func() error {
roleBinding.Labels = getLabels()
roleBinding.RoleRef = rbacv1.RoleRef{
APIGroup: rbacv1.GroupName,
Kind: "Role",
Name: role.Name,
}
roleBinding.Subjects = []rbacv1.Subject{{
Kind: rbacv1.ServiceAccountKind,
Name: serviceAccount.Name,
Namespace: l.namespace,
}}
return nil
})
return err
}
func (l *eventLogger) reconcileDeployment(ctx context.Context) error {
var (
deployment = l.emptyDeployment()
)
genericTokenKubeconfigSecret, found := l.secretsManager.Get(v1beta1constants.SecretNameGenericTokenKubeconfig)
if !found {
return fmt.Errorf("secret %q not found", v1beta1constants.SecretNameGenericTokenKubeconfig)
}
// Deploy the Event Logger into the shoot control-plane
_, err := controllerutils.GetAndCreateOrMergePatch(ctx, l.client, deployment, func() error {
deployment.Labels = getLabels()
deployment.Spec = appsv1.DeploymentSpec{
RevisionHistoryLimit: pointer.Int32(1),
Replicas: pointer.Int32(l.values.Replicas),
Selector: &metav1.LabelSelector{
MatchLabels: getLabels(),
},
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: utils.MergeStringMaps(getLabels(), map[string]string{
v1beta1constants.LabelNetworkPolicyFromPrometheus: v1beta1constants.LabelNetworkPolicyAllowed,
v1beta1constants.LabelNetworkPolicyToDNS: v1beta1constants.LabelNetworkPolicyAllowed,
v1beta1constants.LabelNetworkPolicyToShootAPIServer: v1beta1constants.LabelNetworkPolicyAllowed,
v1beta1constants.LabelNetworkPolicyToSeedAPIServer: v1beta1constants.LabelNetworkPolicyAllowed,
}),
},
Spec: corev1.PodSpec{
ServiceAccountName: name,
PriorityClassName: v1beta1constants.PriorityClassNameShootControlPlane100,
Containers: []corev1.Container{
{
Name: name,
Image: l.values.Image,
ImagePullPolicy: corev1.PullIfNotPresent,
Command: l.computeCommand(),
Resources: corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("12m"),
corev1.ResourceMemory: resource.MustParse("50Mi"),
},
},
},
},
},
},
}
utilruntime.Must(gutil.InjectGenericKubeconfig(deployment, genericTokenKubeconfigSecret.Name, gutil.SecretNamePrefixShootAccess+name))
return nil
})
return err
}
func (l *eventLogger) reconcileVPA(ctx context.Context) error {
var (
vpa = l.emptyVPA()
vpaUpdateMode = vpaautoscalingv1.UpdateModeAuto
controlledValues = vpaautoscalingv1.ContainerControlledValuesRequestsOnly
)
_, err := controllerutils.GetAndCreateOrMergePatch(ctx, l.client, vpa, func() error {
vpa.Spec = vpaautoscalingv1.VerticalPodAutoscalerSpec{
TargetRef: &autoscalingv1.CrossVersionObjectReference{
APIVersion: appsv1.SchemeGroupVersion.String(),
Kind: "Deployment",
Name: v1beta1constants.DeploymentNameEventLogger,
},
UpdatePolicy: &vpaautoscalingv1.PodUpdatePolicy{
UpdateMode: &vpaUpdateMode,
},
ResourcePolicy: &vpaautoscalingv1.PodResourcePolicy{
ContainerPolicies: []vpaautoscalingv1.ContainerResourcePolicy{
{
ContainerName: vpaautoscalingv1.DefaultContainerResourcePolicy,
MinAllowed: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("3m"),
corev1.ResourceMemory: resource.MustParse("20Mi"),
},
ControlledValues: &controlledValues,
},
},
},
}
return nil
})
return err
}
func (l *eventLogger) deleteRBACForShoot(ctx context.Context) error {
if err := managedresources.DeleteForShoot(ctx, l.client, l.namespace, managedResourceName); err != nil {
return err
}
return kutil.DeleteObjects(ctx, l.client, l.newShootAccessSecret().Secret)
}
func (l *eventLogger) newShootAccessSecret() *gutil.ShootAccessSecret {
return gutil.NewShootAccessSecret(name, l.namespace)
}
func (l *eventLogger) emptyRole() *rbacv1.Role {
return &rbacv1.Role{ObjectMeta: metav1.ObjectMeta{Name: name, Namespace: l.namespace}}
}
func (l *eventLogger) emptyRoleBinding() *rbacv1.RoleBinding {
return &rbacv1.RoleBinding{ObjectMeta: metav1.ObjectMeta{Name: name, Namespace: l.namespace}}
}
func (l *eventLogger) emptyServiceAccount() *corev1.ServiceAccount {
return &corev1.ServiceAccount{ObjectMeta: metav1.ObjectMeta{Name: name, Namespace: l.namespace}}
}
func (l *eventLogger) emptyDeployment() *appsv1.Deployment {
return &appsv1.Deployment{ObjectMeta: metav1.ObjectMeta{Name: name, Namespace: l.namespace}}
}
func (l *eventLogger) emptyVPA() *vpaautoscalingv1.VerticalPodAutoscaler {
return &vpaautoscalingv1.VerticalPodAutoscaler{ObjectMeta: metav1.ObjectMeta{Name: vpaName, Namespace: l.namespace}}
}
func (l *eventLogger) computeCommand() []string {
return []string{
"./event-logger",
"--seed-event-namespace=" + l.namespace,
"--shoot-kubeconfig=" + gutil.PathGenericKubeconfig,
"--shoot-event-namespace=" + metav1.NamespaceSystem,
}
}
func getLabels() map[string]string {
return map[string]string{
v1beta1constants.LabelApp: name,
v1beta1constants.LabelRole: v1beta1constants.LabelLogging,
v1beta1constants.GardenRole: v1beta1constants.GardenRoleLogging,
}
}