/
admission.go
754 lines (655 loc) · 25.4 KB
/
admission.go
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// Copyright (c) 2018 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 resourcereferencemanager
import (
"context"
"errors"
"fmt"
"io"
"reflect"
"sync"
"time"
"github.com/gardener/gardener/pkg/apis/core"
"github.com/gardener/gardener/pkg/apis/core/helper"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
admissioninitializer "github.com/gardener/gardener/pkg/apiserver/admission/initializer"
"github.com/gardener/gardener/pkg/client/core/clientset/internalversion"
externalcoreinformers "github.com/gardener/gardener/pkg/client/core/informers/externalversions"
coreinformers "github.com/gardener/gardener/pkg/client/core/informers/internalversion"
corelisters "github.com/gardener/gardener/pkg/client/core/listers/core/internalversion"
corev1alphalisters "github.com/gardener/gardener/pkg/client/core/listers/core/v1alpha1"
clientkubernetes "github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/plugin/pkg/utils"
"github.com/hashicorp/go-multierror"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/api/equality"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apiserver/pkg/admission"
"k8s.io/apiserver/pkg/authorization/authorizer"
"k8s.io/client-go/dynamic"
kubeinformers "k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
kubecorev1listers "k8s.io/client-go/listers/core/v1"
)
const (
// PluginName is the name of this admission plugin.
PluginName = "ResourceReferenceManager"
)
// Register registers a plugin.
func Register(plugins *admission.Plugins) {
plugins.Register(PluginName, func(config io.Reader) (admission.Interface, error) {
return New()
})
}
// ReferenceManager contains listers and and admission handler.
type ReferenceManager struct {
*admission.Handler
gardenCoreClient internalversion.Interface
kubeClient kubernetes.Interface
dynamicClient dynamic.Interface
authorizer authorizer.Authorizer
secretLister kubecorev1listers.SecretLister
configMapLister kubecorev1listers.ConfigMapLister
cloudProfileLister corelisters.CloudProfileLister
seedLister corelisters.SeedLister
shootLister corelisters.ShootLister
secretBindingLister corelisters.SecretBindingLister
projectLister corelisters.ProjectLister
quotaLister corelisters.QuotaLister
controllerDeploymentLister corelisters.ControllerDeploymentLister
exposureClassLister corev1alphalisters.ExposureClassLister
readyFunc admission.ReadyFunc
}
var (
_ = admissioninitializer.WantsInternalCoreInformerFactory(&ReferenceManager{})
_ = admissioninitializer.WantsKubeInformerFactory(&ReferenceManager{})
_ = admissioninitializer.WantsInternalCoreClientset(&ReferenceManager{})
_ = admissioninitializer.WantsKubeClientset(&ReferenceManager{})
_ = admissioninitializer.WantsDynamicClient(&ReferenceManager{})
_ = admissioninitializer.WantsAuthorizer(&ReferenceManager{})
_ = admissioninitializer.WantsExternalCoreInformerFactory(&ReferenceManager{})
readyFuncs = []admission.ReadyFunc{}
// MissingSecretWait is the time how long to wait for a missing secret before re-checking the cache
// (and then doing a live lookup).
MissingSecretWait = 50 * time.Millisecond
)
// New creates a new ReferenceManager admission plugin.
func New() (*ReferenceManager, error) {
return &ReferenceManager{
Handler: admission.NewHandler(admission.Create, admission.Update),
}, nil
}
// AssignReadyFunc assigns the ready function to the admission handler.
func (r *ReferenceManager) AssignReadyFunc(f admission.ReadyFunc) {
r.readyFunc = f
r.SetReadyFunc(f)
}
// SetAuthorizer gets the authorizer.
func (r *ReferenceManager) SetAuthorizer(authorizer authorizer.Authorizer) {
r.authorizer = authorizer
}
// SetInternalCoreInformerFactory gets Lister from SharedInformerFactory.
func (r *ReferenceManager) SetInternalCoreInformerFactory(f coreinformers.SharedInformerFactory) {
seedInformer := f.Core().InternalVersion().Seeds()
r.seedLister = seedInformer.Lister()
shootInformer := f.Core().InternalVersion().Shoots()
r.shootLister = shootInformer.Lister()
cloudProfileInformer := f.Core().InternalVersion().CloudProfiles()
r.cloudProfileLister = cloudProfileInformer.Lister()
secretBindingInformer := f.Core().InternalVersion().SecretBindings()
r.secretBindingLister = secretBindingInformer.Lister()
quotaInformer := f.Core().InternalVersion().Quotas()
r.quotaLister = quotaInformer.Lister()
projectInformer := f.Core().InternalVersion().Projects()
r.projectLister = projectInformer.Lister()
controllerDeploymentInformer := f.Core().InternalVersion().ControllerDeployments()
r.controllerDeploymentLister = controllerDeploymentInformer.Lister()
readyFuncs = append(readyFuncs, seedInformer.Informer().HasSynced, shootInformer.Informer().HasSynced, cloudProfileInformer.Informer().HasSynced, secretBindingInformer.Informer().HasSynced, quotaInformer.Informer().HasSynced, projectInformer.Informer().HasSynced, controllerDeploymentInformer.Informer().HasSynced)
}
// SetExternalCoreInformerFactory sets the external garden core informer factory.
func (r *ReferenceManager) SetExternalCoreInformerFactory(f externalcoreinformers.SharedInformerFactory) {
exposureClassInformer := f.Core().V1alpha1().ExposureClasses()
r.exposureClassLister = exposureClassInformer.Lister()
readyFuncs = append(readyFuncs, exposureClassInformer.Informer().HasSynced)
}
// SetKubeInformerFactory gets Lister from SharedInformerFactory.
func (r *ReferenceManager) SetKubeInformerFactory(f kubeinformers.SharedInformerFactory) {
secretInformer := f.Core().V1().Secrets()
r.secretLister = secretInformer.Lister()
configMapInformer := f.Core().V1().ConfigMaps()
r.configMapLister = configMapInformer.Lister()
readyFuncs = append(readyFuncs, secretInformer.Informer().HasSynced, configMapInformer.Informer().HasSynced)
}
// SetInternalCoreClientset sets the Gardener client.
func (r *ReferenceManager) SetInternalCoreClientset(c internalversion.Interface) {
r.gardenCoreClient = c
}
// SetKubeClientset sets the Kubernetes client.
func (r *ReferenceManager) SetKubeClientset(c kubernetes.Interface) {
r.kubeClient = c
}
// SetDynamicClient sets the dynamic client.
func (r *ReferenceManager) SetDynamicClient(c dynamic.Interface) {
r.dynamicClient = c
}
// ValidateInitialization checks whether the plugin was correctly initialized.
func (r *ReferenceManager) ValidateInitialization() error {
if r.authorizer == nil {
return errors.New("missing authorizer")
}
if r.secretLister == nil {
return errors.New("missing secret lister")
}
if r.configMapLister == nil {
return errors.New("missing configMap lister")
}
if r.cloudProfileLister == nil {
return errors.New("missing cloud profile lister")
}
if r.seedLister == nil {
return errors.New("missing seed lister")
}
if r.shootLister == nil {
return errors.New("missing shoot lister")
}
if r.secretBindingLister == nil {
return errors.New("missing secret binding lister")
}
if r.quotaLister == nil {
return errors.New("missing quota lister")
}
if r.projectLister == nil {
return errors.New("missing project lister")
}
if r.exposureClassLister == nil {
return errors.New("missing exposure class lister")
}
return nil
}
// Admit ensures that referenced resources do actually exist.
func (r *ReferenceManager) Admit(ctx context.Context, a admission.Attributes, o admission.ObjectInterfaces) error {
// Wait until the caches have been synced
if r.readyFunc == nil {
r.AssignReadyFunc(func() bool {
for _, readyFunc := range readyFuncs {
if !readyFunc() {
return false
}
}
return true
})
}
if !r.WaitForReady() {
return admission.NewForbidden(a, errors.New("not yet ready to handle request"))
}
var (
err error
operation = a.GetOperation()
)
switch a.GetKind().GroupKind() {
case core.Kind("SecretBinding"):
binding, ok := a.GetObject().(*core.SecretBinding)
if !ok {
return apierrors.NewBadRequest("could not convert resource into SecretBinding object")
}
if utils.SkipVerification(operation, binding.ObjectMeta) {
return nil
}
err = r.ensureSecretBindingReferences(ctx, a, binding)
case core.Kind("Seed"):
seed, ok := a.GetObject().(*core.Seed)
if !ok {
return apierrors.NewBadRequest("could not convert resource into Seed object")
}
if utils.SkipVerification(operation, seed.ObjectMeta) {
return nil
}
err = r.ensureSeedReferences(ctx, seed)
if operation == admission.Update {
oldSeed, ok := a.GetOldObject().(*core.Seed)
if !ok {
return apierrors.NewBadRequest("could not convert old resource into Seed object")
}
if oldSeed.Spec.Settings.ShootDNS.Enabled != seed.Spec.Settings.ShootDNS.Enabled {
shootList, err2 := r.shootLister.List(labels.Everything())
if err2 != nil {
return err2
}
for _, shoot := range shootList {
if shoot.Spec.SeedName == nil || *shoot.Spec.SeedName != seed.Name {
continue
}
err = errors.New("may not change shoot DNS enablement setting when shoots are still referencing to a seed")
}
}
}
case core.Kind("Shoot"):
var (
oldShoot, shoot *core.Shoot
ok bool
)
shoot, ok = a.GetObject().(*core.Shoot)
if !ok {
return apierrors.NewBadRequest("could not convert resource into Shoot object")
}
if utils.SkipVerification(operation, shoot.ObjectMeta) {
return nil
}
switch a.GetOperation() {
case admission.Create:
// Add createdBy annotation to Shoot
annotations := shoot.Annotations
if annotations == nil {
annotations = map[string]string{}
}
annotations[v1beta1constants.GardenCreatedBy] = a.GetUserInfo().GetName()
shoot.Annotations = annotations
oldShoot = &core.Shoot{}
case admission.Update:
// skip verification if spec wasn't changed
// this way we make sure, that users can always annotate/label the shoot if the spec doesn't change
oldShoot, ok = a.GetOldObject().(*core.Shoot)
if !ok {
return apierrors.NewBadRequest("could not convert old resource into Shoot object")
}
if reflect.DeepEqual(oldShoot.Spec, shoot.Spec) {
return nil
}
}
err = r.ensureShootReferences(ctx, a, oldShoot, shoot)
case core.Kind("Project"):
project, ok := a.GetObject().(*core.Project)
if !ok {
return apierrors.NewBadRequest("could not convert resource into Project object")
}
if utils.SkipVerification(operation, project.ObjectMeta) {
return nil
}
// Set createdBy field in Project
switch a.GetOperation() {
case admission.Create:
project.Spec.CreatedBy = &rbacv1.Subject{
APIGroup: "rbac.authorization.k8s.io",
Kind: rbacv1.UserKind,
Name: a.GetUserInfo().GetName(),
}
if project.Spec.Owner == nil {
owner := project.Spec.CreatedBy
outer:
for _, member := range project.Spec.Members {
for _, role := range member.Roles {
if role == core.ProjectMemberOwner {
owner = member.Subject.DeepCopy()
break outer
}
}
}
project.Spec.Owner = owner
}
err = r.ensureProjectNamespace(project)
case admission.Update:
oldProject, ok := a.GetOldObject().(*core.Project)
if !ok {
return apierrors.NewBadRequest("could not convert old resource into Project object")
}
if oldProject.Spec.Namespace == nil && project.Spec.Namespace != nil {
err = r.ensureProjectNamespace(project)
}
}
if project.Spec.Owner != nil {
ownerIsMember := false
for _, member := range project.Spec.Members {
if member.Subject == *project.Spec.Owner {
ownerIsMember = true
}
}
if !ownerIsMember {
project.Spec.Members = append(project.Spec.Members, core.ProjectMember{
Subject: *project.Spec.Owner,
Roles: []string{
core.ProjectMemberAdmin,
core.ProjectMemberOwner,
},
})
}
}
case core.Kind("CloudProfile"):
cloudProfile, ok := a.GetObject().(*core.CloudProfile)
if !ok {
return apierrors.NewBadRequest("could not convert resource into CloudProfile object")
}
if utils.SkipVerification(operation, cloudProfile.ObjectMeta) {
return nil
}
if a.GetOperation() == admission.Update {
oldCloudProfile, ok := a.GetOldObject().(*core.CloudProfile)
if !ok {
return apierrors.NewBadRequest("could not convert old resource into CloudProfile object")
}
// getting Kubernetes versions that have been removed from the CloudProfile
removedKubernetesVersions := sets.StringKeySet(helper.GetRemovedVersions(oldCloudProfile.Spec.Kubernetes.Versions, cloudProfile.Spec.Kubernetes.Versions))
// getting Machine image versions that have been removed from the CloudProfile
removedMachineImageVersions := map[string]sets.String{}
for _, oldImage := range oldCloudProfile.Spec.MachineImages {
imageFound := false
for _, newImage := range cloudProfile.Spec.MachineImages {
if oldImage.Name == newImage.Name {
imageFound = true
removedMachineImageVersions[oldImage.Name] = sets.StringKeySet(
helper.GetRemovedVersions(
helper.ToExpirableVersions(oldImage.Versions),
helper.ToExpirableVersions(newImage.Versions),
),
)
}
}
if !imageFound {
for _, version := range oldImage.Versions {
if removedMachineImageVersions[oldImage.Name] == nil {
removedMachineImageVersions[oldImage.Name] = sets.NewString()
}
removedMachineImageVersions[oldImage.Name] = removedMachineImageVersions[oldImage.Name].Insert(version.Version)
}
}
}
if len(removedKubernetesVersions) > 0 || len(removedMachineImageVersions) > 0 {
shootList, err1 := r.shootLister.List(labels.Everything())
if err1 != nil {
return apierrors.NewInternalError(fmt.Errorf("could not list shoots to verify that Kubernetes and/or Machine image version can be removed: %v", err1))
}
var (
channel = make(chan error)
wg sync.WaitGroup
)
wg.Add(len(shootList))
for _, s := range shootList {
if s.Spec.CloudProfileName != cloudProfile.Name || s.DeletionTimestamp != nil {
wg.Done()
continue
}
go func(shoot *core.Shoot) {
defer wg.Done()
if removedKubernetesVersions.Has(shoot.Spec.Kubernetes.Version) {
channel <- fmt.Errorf("unable to delete Kubernetes version %q from CloudProfile %q - version is still in use by shoot '%s/%s'", shoot.Spec.Kubernetes.Version, shoot.Spec.CloudProfileName, shoot.Namespace, shoot.Name)
}
for _, worker := range shoot.Spec.Provider.Workers {
if worker.Machine.Image == nil {
continue
}
// happens if Shoot runs an image that does not exist in the old CloudProfile - in this case: ignore
if _, ok := removedMachineImageVersions[worker.Machine.Image.Name]; !ok {
continue
}
if removedMachineImageVersions[worker.Machine.Image.Name].Has(worker.Machine.Image.Version) {
channel <- fmt.Errorf("unable to delete Machine image version '%s/%s' from CloudProfile %q - version is still in use by shoot '%s/%s' by worker %q", worker.Machine.Image.Name, worker.Machine.Image.Version, shoot.Spec.CloudProfileName, shoot.Namespace, shoot.Name, worker.Name)
}
}
}(s)
}
// close channel when wait group has 0 counter
go func() {
wg.Wait()
close(channel)
}()
for channelResult := range channel {
err = multierror.Append(err, channelResult)
}
}
}
case core.Kind("ControllerRegistration"):
controllerRegistration, ok := a.GetObject().(*core.ControllerRegistration)
if !ok {
return apierrors.NewBadRequest("could not convert resource into ControllerRegistration object")
}
err = r.ensureControllerRegistrationReferences(ctx, controllerRegistration)
}
if err != nil {
return admission.NewForbidden(a, err)
}
return nil
}
func (r *ReferenceManager) ensureControllerRegistrationReferences(ctx context.Context, ctrlReg *core.ControllerRegistration) error {
deployment := ctrlReg.Spec.Deployment
if ctrlReg.Spec.Deployment == nil {
return nil
}
var refErrs error
for _, reg := range deployment.DeploymentRefs {
if err := r.lookupControllerDeployment(ctx, reg.Name); err != nil {
refErrs = multierror.Append(refErrs, err)
}
}
return refErrs
}
func (r *ReferenceManager) ensureProjectNamespace(project *core.Project) error {
projects, err := r.projectLister.List(labels.Everything())
if err != nil {
return err
}
for _, p := range projects {
if p.Spec.Namespace != nil && project.Spec.Namespace != nil && *p.Spec.Namespace == *project.Spec.Namespace && p.Name != project.Name {
return fmt.Errorf("namespace %q is already used by another project", *project.Spec.Namespace)
}
}
return nil
}
func (r *ReferenceManager) ensureSecretBindingReferences(ctx context.Context, attributes admission.Attributes, binding *core.SecretBinding) error {
readAttributes := authorizer.AttributesRecord{
User: attributes.GetUserInfo(),
Verb: "get",
APIGroup: "",
APIVersion: "v1",
Resource: "secrets",
Namespace: binding.SecretRef.Namespace,
Name: binding.SecretRef.Name,
ResourceRequest: true,
}
if decision, _, _ := r.authorizer.Authorize(ctx, readAttributes); decision != authorizer.DecisionAllow {
return errors.New("SecretBinding cannot reference a secret you are not allowed to read")
}
if err := r.lookupSecret(ctx, binding.SecretRef.Namespace, binding.SecretRef.Name); err != nil {
return err
}
var (
secretQuotaCount int
projectQuotaCount int
)
for _, quotaRef := range binding.Quotas {
readAttributes := authorizer.AttributesRecord{
User: attributes.GetUserInfo(),
Verb: "get",
APIGroup: gardencorev1beta1.SchemeGroupVersion.Group,
APIVersion: gardencorev1beta1.SchemeGroupVersion.Version,
Resource: "quotas",
Subresource: "",
Namespace: quotaRef.Namespace,
Name: quotaRef.Name,
ResourceRequest: true,
Path: "",
}
if decision, _, _ := r.authorizer.Authorize(ctx, readAttributes); decision != authorizer.DecisionAllow {
return errors.New("SecretBinding cannot reference a quota you are not allowed to read")
}
quota, err := r.quotaLister.Quotas(quotaRef.Namespace).Get(quotaRef.Name)
if err != nil {
return err
}
scope, err := helper.QuotaScope(quota.Spec.Scope)
if err != nil {
return err
}
if scope == "project" {
projectQuotaCount++
}
if scope == "secret" {
secretQuotaCount++
}
if projectQuotaCount > 1 || secretQuotaCount > 1 {
return errors.New("only one quota per scope (project or secret) can be assigned")
}
}
return nil
}
func (r *ReferenceManager) ensureSeedReferences(ctx context.Context, seed *core.Seed) error {
if seed.Spec.SecretRef == nil {
return nil
}
return r.lookupSecret(ctx, seed.Spec.SecretRef.Namespace, seed.Spec.SecretRef.Name)
}
func (r *ReferenceManager) ensureShootReferences(ctx context.Context, attributes admission.Attributes, oldShoot, shoot *core.Shoot) error {
if !equality.Semantic.DeepEqual(oldShoot.Spec.CloudProfileName, shoot.Spec.CloudProfileName) {
if _, err := r.cloudProfileLister.Get(shoot.Spec.CloudProfileName); err != nil {
return err
}
}
if !equality.Semantic.DeepEqual(oldShoot.Spec.SeedName, shoot.Spec.SeedName) {
if shoot.Spec.SeedName != nil {
if _, err := r.seedLister.Get(*shoot.Spec.SeedName); err != nil {
return err
}
}
}
if !equality.Semantic.DeepEqual(oldShoot.Spec.SecretBindingName, shoot.Spec.SecretBindingName) {
if _, err := r.secretBindingLister.SecretBindings(shoot.Namespace).Get(shoot.Spec.SecretBindingName); err != nil {
return err
}
}
if !equality.Semantic.DeepEqual(oldShoot.Spec.ExposureClassName, shoot.Spec.ExposureClassName) && shoot.Spec.ExposureClassName != nil {
if _, err := r.exposureClassLister.Get(*shoot.Spec.ExposureClassName); err != nil {
return err
}
}
if !equality.Semantic.DeepEqual(oldShoot.Spec.Resources, shoot.Spec.Resources) {
for _, resource := range shoot.Spec.Resources {
// Get the APIResource for the current resource
apiResource, err := r.getAPIResource(resource.ResourceRef.APIVersion, resource.ResourceRef.Kind)
if err != nil {
return err
}
if apiResource == nil {
return fmt.Errorf("shoot resource reference %q could not be resolved for API resource with version %q and kind %q", resource.Name, resource.ResourceRef.APIVersion, resource.ResourceRef.Kind)
}
// Parse APIVersion to GroupVersion
gv, err := schema.ParseGroupVersion(resource.ResourceRef.APIVersion)
if err != nil {
return err
}
// Check if the resource is namespaced
if !apiResource.Namespaced {
return fmt.Errorf("failed to resolve shoot resource reference %q. Cannot reference a resource that is not namespaced", resource.Name)
}
// Check if the user is allowed to read the resource
readAttributes := authorizer.AttributesRecord{
User: attributes.GetUserInfo(),
Verb: "get",
APIGroup: gv.Group,
APIVersion: gv.Version,
Resource: apiResource.Name,
Namespace: shoot.Namespace,
Name: resource.ResourceRef.Name,
ResourceRequest: true,
}
if decision, _, _ := r.authorizer.Authorize(ctx, readAttributes); decision != authorizer.DecisionAllow {
return errors.New("shoot cannot reference a resource you are not allowed to read")
}
// Check if the resource actually exists
if err := r.lookupResource(ctx, gv.WithResource(apiResource.Name), shoot.Namespace, resource.ResourceRef.Name); err != nil {
return fmt.Errorf("failed to resolve shoot resource reference %q: %w", resource.Name, err)
}
}
}
if !equality.Semantic.DeepEqual(oldShoot.Spec.DNS, shoot.Spec.DNS) && shoot.Spec.DNS != nil && shoot.DeletionTimestamp == nil {
for _, dnsProvider := range shoot.Spec.DNS.Providers {
if dnsProvider.SecretName == nil {
continue
}
if err := r.lookupSecret(ctx, shoot.Namespace, *dnsProvider.SecretName); err != nil {
return fmt.Errorf("failed to reference DNS provider secret %w", err)
}
}
}
return nil
}
type getFn func(context.Context, string, string) (runtime.Object, error)
func lookupResource(ctx context.Context, namespace, name string, get getFn, fallbackGet getFn) error {
// First try to detect the secret in the cache.
var err error
_, err = get(ctx, namespace, name)
if err == nil {
return nil
}
if !apierrors.IsNotFound(err) {
return err
}
// Second try to detect the secret in the cache after the first try failed.
// Give the cache time to observe the secret before rejecting a create.
// This helps when creating a secret and immediately creating a secretbinding referencing it.
time.Sleep(MissingSecretWait)
_, err = get(ctx, namespace, name)
switch {
case apierrors.IsNotFound(err):
// no-op
case err != nil:
return err
default:
return nil
}
// Third try to detect the secret, now by doing a live lookup instead of relying on the cache.
if _, err := fallbackGet(ctx, namespace, name); err != nil {
return err
}
return nil
}
func (r *ReferenceManager) lookupSecret(ctx context.Context, namespace, name string) error {
secretFromLister := func(_ context.Context, namespace, name string) (runtime.Object, error) {
return r.secretLister.Secrets(namespace).Get(name)
}
secretFromClient := func(ctx context.Context, namespace, name string) (runtime.Object, error) {
return r.kubeClient.CoreV1().Secrets(namespace).Get(ctx, name, clientkubernetes.DefaultGetOptions())
}
return lookupResource(ctx, namespace, name, secretFromLister, secretFromClient)
}
func (r *ReferenceManager) lookupControllerDeployment(ctx context.Context, name string) error {
deploymentFromLister := func(_ context.Context, _, name string) (runtime.Object, error) {
return r.controllerDeploymentLister.Get(name)
}
deploymentFromClient := func(ctx context.Context, _, name string) (runtime.Object, error) {
return r.gardenCoreClient.Core().ControllerDeployments().Get(ctx, name, clientkubernetes.DefaultGetOptions())
}
return lookupResource(ctx, "", name, deploymentFromLister, deploymentFromClient)
}
func (r *ReferenceManager) getAPIResource(groupVersion, kind string) (*metav1.APIResource, error) {
resources, err := r.kubeClient.Discovery().ServerResourcesForGroupVersion(groupVersion)
if err != nil {
return nil, err
}
for _, apiResource := range resources.APIResources {
if apiResource.Kind == kind {
return &apiResource, nil
}
}
return nil, nil
}
func (r *ReferenceManager) lookupResource(ctx context.Context, resource schema.GroupVersionResource, namespace, name string) error {
if _, err := r.dynamicClient.Resource(resource).Namespace(namespace).Get(ctx, name, clientkubernetes.DefaultGetOptions()); err != nil {
return err
}
return nil
}