/
mutator.go
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/
mutator.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 genericmutator
import (
"context"
extensionscontroller "github.com/gardener/gardener/extensions/pkg/controller"
"github.com/gardener/gardener/extensions/pkg/controller/operatingsystemconfig/oscommon/cloudinit"
"github.com/gardener/gardener/extensions/pkg/util"
extensionswebhook "github.com/gardener/gardener/extensions/pkg/webhook"
"github.com/gardener/gardener/extensions/pkg/webhook/controlplane"
"github.com/coreos/go-systemd/unit"
druidv1alpha1 "github.com/gardener/etcd-druid/api/v1alpha1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/go-logr/logr"
"github.com/pkg/errors"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
kubeletconfigv1beta1 "k8s.io/kubelet/config/v1beta1"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
)
// EnsurerContext wraps the actual context and cluster object.
type EnsurerContext interface {
GetCluster(ctx context.Context) (*extensionscontroller.Cluster, error)
}
// Ensurer ensures that various standard Kubernets controlplane objects conform to the provider requirements.
// If they don't initially, they are mutated accordingly.
type Ensurer interface {
// EnsureKubeAPIServerService ensures that the kube-apiserver service conforms to the provider requirements.
// "old" might be "nil" and must always be checked.
EnsureKubeAPIServerService(ctx context.Context, etcx EnsurerContext, new, old *corev1.Service) error
// EnsureKubeAPIServerDeployment ensures that the kube-apiserver deployment conforms to the provider requirements.
// "old" might be "nil" and must always be checked.
EnsureKubeAPIServerDeployment(ctx context.Context, etcx EnsurerContext, new, old *appsv1.Deployment) error
// EnsureKubeControllerManagerDeployment ensures that the kube-controller-manager deployment conforms to the provider requirements.
// "old" might be "nil" and must always be checked.
EnsureKubeControllerManagerDeployment(ctx context.Context, etcx EnsurerContext, new, old *appsv1.Deployment) error
// EnsureKubeSchedulerDeployment ensures that the kube-scheduler deployment conforms to the provider requirements.
// "old" might be "nil" and must always be checked.
EnsureKubeSchedulerDeployment(ctx context.Context, etcx EnsurerContext, new, old *appsv1.Deployment) error
// EnsureETCD ensures that the etcds conform to the respective provider requirements.
// "old" might be "nil" and must always be checked.
EnsureETCD(ctx context.Context, etcx EnsurerContext, new, old *druidv1alpha1.Etcd) error
// EnsureKubeletServiceUnitOptions ensures that the kubelet.service unit options conform to the provider requirements.
EnsureKubeletServiceUnitOptions(ctx context.Context, etcx EnsurerContext, new, old []*unit.UnitOption) ([]*unit.UnitOption, error)
// EnsureKubeletConfiguration ensures that the kubelet configuration conforms to the provider requirements.
// "old" might be "nil" and must always be checked.
EnsureKubeletConfiguration(ctx context.Context, etcx EnsurerContext, new, old *kubeletconfigv1beta1.KubeletConfiguration) error
// EnsureKubernetesGeneralConfiguration ensures that the kubernetes general configuration conforms to the provider requirements.
// "old" might be "nil" and must always be checked.
EnsureKubernetesGeneralConfiguration(ctx context.Context, etcx EnsurerContext, new, old *string) error
// ShouldProvisionKubeletCloudProviderConfig returns true if the cloud provider config file should be added to the kubelet configuration.
ShouldProvisionKubeletCloudProviderConfig(ctx context.Context, etcx EnsurerContext) bool
// EnsureKubeletCloudProviderConfig ensures that the cloud provider config file content conforms to the provider requirements.
EnsureKubeletCloudProviderConfig(context.Context, EnsurerContext, *string, string) error
// EnsureAdditionalUnits ensures additional systemd units
// "old" might be "nil" and must always be checked.
EnsureAdditionalUnits(ctx context.Context, etcx EnsurerContext, new, old *[]extensionsv1alpha1.Unit) error
// EnsureAdditionalFile ensures additional systemd files
// "old" might be "nil" and must always be checked.
EnsureAdditionalFiles(ctx context.Context, etcx EnsurerContext, new, old *[]extensionsv1alpha1.File) error
}
// NewMutator creates a new controlplane mutator.
func NewMutator(
ensurer Ensurer,
unitSerializer controlplane.UnitSerializer,
kubeletConfigCodec controlplane.KubeletConfigCodec,
fciCodec controlplane.FileContentInlineCodec,
logger logr.Logger,
) extensionswebhook.Mutator {
return &mutator{
ensurer: ensurer,
unitSerializer: unitSerializer,
kubeletConfigCodec: kubeletConfigCodec,
fciCodec: fciCodec,
logger: logger.WithName("mutator"),
}
}
type mutator struct {
client client.Client
ensurer Ensurer
unitSerializer controlplane.UnitSerializer
kubeletConfigCodec controlplane.KubeletConfigCodec
fciCodec controlplane.FileContentInlineCodec
logger logr.Logger
}
// InjectClient injects the given client into the ensurer.
// TODO Replace this with the more generic InjectFunc when controller runtime supports it
func (m *mutator) InjectClient(client client.Client) error {
m.client = client
if _, err := inject.ClientInto(client, m.ensurer); err != nil {
return errors.Wrap(err, "could not inject the client into the ensurer")
}
return nil
}
type ensurerContext struct {
client client.Client
object metav1.Object
cluster *extensionscontroller.Cluster
}
// NewEnsurerContext creates an ensurer context object.
func NewEnsurerContext(client client.Client, object metav1.Object) EnsurerContext {
return &ensurerContext{
client: client,
object: object,
}
}
// NewInternalEnsurerContext creates an ensurer context object.
func NewInternalEnsurerContext(cluster *extensionscontroller.Cluster) EnsurerContext {
return &ensurerContext{
cluster: cluster,
}
}
// GetCluster returns the cluster object.
func (c *ensurerContext) GetCluster(ctx context.Context) (*extensionscontroller.Cluster, error) {
if c.cluster == nil {
cluster, err := extensionscontroller.GetCluster(ctx, c.client, c.object.GetNamespace())
if err != nil {
return nil, errors.Wrapf(err, "could not get cluster for namespace '%s'", c.object.GetNamespace())
}
c.cluster = cluster
}
return c.cluster, nil
}
// Mutate validates and if needed mutates the given object.
func (m *mutator) Mutate(ctx context.Context, new, old runtime.Object) error {
acc, err := meta.Accessor(new)
if err != nil {
return errors.Wrapf(err, "could not create accessor during webhook")
}
// If the object does have a deletion timestamp then we don't want to mutate anything.
if acc.GetDeletionTimestamp() != nil {
return nil
}
o, ok := new.(metav1.Object)
if !ok {
return errors.Wrapf(err, "could not cast runtime object to metav1 object")
}
ectx := NewEnsurerContext(m.client, o)
switch x := new.(type) {
case *corev1.Service:
switch x.Name {
case v1beta1constants.DeploymentNameKubeAPIServer:
var oldSvc *corev1.Service
if old != nil {
oldSvc, ok = old.(*corev1.Service)
if !ok {
return errors.Wrapf(err, "could not cast old object to corev1.Service")
}
}
extensionswebhook.LogMutation(m.logger, x.Kind, x.Namespace, x.Name)
return m.ensurer.EnsureKubeAPIServerService(ctx, ectx, x, oldSvc)
}
case *appsv1.Deployment:
var oldDep *appsv1.Deployment
if old != nil {
oldDep, ok = old.(*appsv1.Deployment)
if !ok {
return errors.Wrapf(err, "could not cast old object to appsv1.Deployment")
}
}
switch x.Name {
case v1beta1constants.DeploymentNameKubeAPIServer:
extensionswebhook.LogMutation(m.logger, x.Kind, x.Namespace, x.Name)
return m.ensurer.EnsureKubeAPIServerDeployment(ctx, ectx, x, oldDep)
case v1beta1constants.DeploymentNameKubeControllerManager:
extensionswebhook.LogMutation(m.logger, x.Kind, x.Namespace, x.Name)
return m.ensurer.EnsureKubeControllerManagerDeployment(ctx, ectx, x, oldDep)
case v1beta1constants.DeploymentNameKubeScheduler:
extensionswebhook.LogMutation(m.logger, x.Kind, x.Namespace, x.Name)
return m.ensurer.EnsureKubeSchedulerDeployment(ctx, ectx, x, oldDep)
}
case *druidv1alpha1.Etcd:
switch x.Name {
case v1beta1constants.ETCDMain, v1beta1constants.ETCDEvents:
var oldEtcd *druidv1alpha1.Etcd
if old != nil {
oldEtcd, ok = old.(*druidv1alpha1.Etcd)
if !ok {
return errors.Wrapf(err, "could not cast old object to druidv1alpha1.Etcd")
}
}
extensionswebhook.LogMutation(m.logger, x.Kind, x.Namespace, x.Name)
return m.ensurer.EnsureETCD(ctx, ectx, x, oldEtcd)
}
case *extensionsv1alpha1.OperatingSystemConfig:
if x.Spec.Purpose == extensionsv1alpha1.OperatingSystemConfigPurposeReconcile {
var oldOSC *extensionsv1alpha1.OperatingSystemConfig
if old != nil {
oldOSC, ok = old.(*extensionsv1alpha1.OperatingSystemConfig)
if !ok {
return errors.Wrapf(err, "could not cast old object to extensionsv1alpha1.OperatingSystemConfig")
}
}
extensionswebhook.LogMutation(m.logger, x.Kind, x.Namespace, x.Name)
return m.mutateOperatingSystemConfig(ctx, ectx, x, oldOSC)
}
return nil
}
return nil
}
func getKubeletService(osc *extensionsv1alpha1.OperatingSystemConfig) *string {
if osc != nil {
if u := extensionswebhook.UnitWithName(osc.Spec.Units, v1beta1constants.OperatingSystemConfigUnitNameKubeletService); u != nil {
return u.Content
}
}
return nil
}
func getKubeletConfigFile(osc *extensionsv1alpha1.OperatingSystemConfig) *extensionsv1alpha1.FileContentInline {
return findFileWithPath(osc, v1beta1constants.OperatingSystemConfigFilePathKubeletConfig)
}
func getKubernetesGeneralConfiguration(osc *extensionsv1alpha1.OperatingSystemConfig) *extensionsv1alpha1.FileContentInline {
return findFileWithPath(osc, v1beta1constants.OperatingSystemConfigFilePathKernelSettings)
}
func findFileWithPath(osc *extensionsv1alpha1.OperatingSystemConfig, path string) *extensionsv1alpha1.FileContentInline {
if osc != nil {
if f := extensionswebhook.FileWithPath(osc.Spec.Files, path); f != nil {
return f.Content.Inline
}
}
return nil
}
func (m *mutator) mutateOperatingSystemConfig(ctx context.Context, ectx EnsurerContext, osc, oldOSC *extensionsv1alpha1.OperatingSystemConfig) error {
// Mutate kubelet.service unit, if present
if content := getKubeletService(osc); content != nil {
if err := m.ensureKubeletServiceUnitContent(ctx, ectx, content, getKubeletService(oldOSC)); err != nil {
return err
}
}
// Mutate kubelet configuration file, if present
if content := getKubeletConfigFile(osc); content != nil {
if err := m.ensureKubeletConfigFileContent(ctx, ectx, content, getKubeletConfigFile(oldOSC)); err != nil {
return err
}
}
// Mutate 99 kubernetes general configuration file, if present
if content := getKubernetesGeneralConfiguration(osc); content != nil {
if err := m.ensureKubernetesGeneralConfiguration(ctx, ectx, content, getKubernetesGeneralConfiguration(oldOSC)); err != nil {
return err
}
}
// Check if cloud provider config needs to be ensured
if m.ensurer.ShouldProvisionKubeletCloudProviderConfig(ctx, ectx) {
if err := m.ensureKubeletCloudProviderConfig(ctx, ectx, osc); err != nil {
return err
}
}
var (
oldFiles *[]extensionsv1alpha1.File
oldUnits *[]extensionsv1alpha1.Unit
)
if oldOSC != nil {
oldFiles = &oldOSC.Spec.Files
oldUnits = &oldOSC.Spec.Units
}
if err := m.ensurer.EnsureAdditionalFiles(ctx, ectx, &osc.Spec.Files, oldFiles); err != nil {
return err
}
if err := m.ensurer.EnsureAdditionalUnits(ctx, ectx, &osc.Spec.Units, oldUnits); err != nil {
return err
}
return nil
}
func (m *mutator) ensureKubeletServiceUnitContent(ctx context.Context, ectx EnsurerContext, content, oldContent *string) error {
var (
opts, oldOpts []*unit.UnitOption
err error
)
// Deserialize unit options
if opts, err = m.unitSerializer.Deserialize(*content); err != nil {
return errors.Wrap(err, "could not deserialize kubelet.service unit content")
}
if oldContent != nil {
// Deserialize old unit options
if oldOpts, err = m.unitSerializer.Deserialize(*oldContent); err != nil {
return errors.Wrap(err, "could not deserialize old kubelet.service unit content")
}
}
if opts, err = m.ensurer.EnsureKubeletServiceUnitOptions(ctx, ectx, opts, oldOpts); err != nil {
return err
}
// Serialize unit options
if *content, err = m.unitSerializer.Serialize(opts); err != nil {
return errors.Wrap(err, "could not serialize kubelet.service unit options")
}
return nil
}
func (m *mutator) ensureKubeletConfigFileContent(ctx context.Context, ectx EnsurerContext, fci, oldFCI *extensionsv1alpha1.FileContentInline) error {
var (
kubeletConfig, oldKubeletConfig *kubeletconfigv1beta1.KubeletConfiguration
err error
)
// Decode kubelet configuration from inline content
if kubeletConfig, err = m.kubeletConfigCodec.Decode(fci); err != nil {
return errors.Wrap(err, "could not decode kubelet configuration")
}
if oldFCI != nil {
// Decode old kubelet configuration from inline content
if oldKubeletConfig, err = m.kubeletConfigCodec.Decode(oldFCI); err != nil {
return errors.Wrap(err, "could not decode old kubelet configuration")
}
}
if err = m.ensurer.EnsureKubeletConfiguration(ctx, ectx, kubeletConfig, oldKubeletConfig); err != nil {
return err
}
// Encode kubelet configuration into inline content
var newFCI *extensionsv1alpha1.FileContentInline
if newFCI, err = m.kubeletConfigCodec.Encode(kubeletConfig, fci.Encoding); err != nil {
return errors.Wrap(err, "could not encode kubelet configuration")
}
*fci = *newFCI
return nil
}
func (m *mutator) ensureKubernetesGeneralConfiguration(ctx context.Context, ectx EnsurerContext, fci, oldFCI *extensionsv1alpha1.FileContentInline) error {
var (
data, oldData []byte
err error
)
// Decode kubernetes general configuration from inline content
if data, err = m.fciCodec.Decode(fci); err != nil {
return errors.Wrap(err, "could not decode kubernetes general configuration")
}
if oldFCI != nil {
// Decode kubernetes general configuration from inline content
if oldData, err = m.fciCodec.Decode(oldFCI); err != nil {
return errors.Wrap(err, "could not decode old kubernetes general configuration")
}
}
s := string(data)
oldS := string(oldData)
if err = m.ensurer.EnsureKubernetesGeneralConfiguration(ctx, ectx, &s, &oldS); err != nil {
return err
}
// Encode kubernetes general configuration into inline content
var newFCI *extensionsv1alpha1.FileContentInline
if newFCI, err = m.fciCodec.Encode([]byte(s), fci.Encoding); err != nil {
return errors.Wrap(err, "could not encode kubernetes general configuration")
}
*fci = *newFCI
return nil
}
const CloudProviderConfigPath = "/var/lib/kubelet/cloudprovider.conf"
func (m *mutator) ensureKubeletCloudProviderConfig(ctx context.Context, ectx EnsurerContext, osc *extensionsv1alpha1.OperatingSystemConfig) error {
var err error
// Ensure kubelet cloud provider config
var s string
if err = m.ensurer.EnsureKubeletCloudProviderConfig(ctx, ectx, &s, osc.Namespace); err != nil {
return err
}
// Encode cloud provider config into inline content
var fci *extensionsv1alpha1.FileContentInline
if fci, err = m.fciCodec.Encode([]byte(s), string(cloudinit.B64FileCodecID)); err != nil {
return errors.Wrap(err, "could not encode kubelet cloud provider config")
}
// Ensure the cloud provider config file is part of the OperatingSystemConfig
osc.Spec.Files = extensionswebhook.EnsureFileWithPath(osc.Spec.Files, extensionsv1alpha1.File{
Path: CloudProviderConfigPath,
Permissions: util.Int32Ptr(0644),
Content: extensionsv1alpha1.FileContent{
Inline: fci,
},
})
return nil
}