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storage.go 11.60 KB
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Copyright 2015 The Kubernetes Authors.
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
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.
package storage
import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
genericregistry "k8s.io/apiserver/pkg/registry/generic/registry"
storeerr "k8s.io/apiserver/pkg/storage/errors"
appsv1beta1 "k8s.io/kubernetes/pkg/apis/apps/v1beta1"
appsv1beta2 "k8s.io/kubernetes/pkg/apis/apps/v1beta2"
appsvalidation "k8s.io/kubernetes/pkg/apis/apps/validation"
autoscalingv1 "k8s.io/kubernetes/pkg/apis/autoscaling/v1"
autoscalingvalidation "k8s.io/kubernetes/pkg/apis/autoscaling/validation"
extensionsv1beta1 "k8s.io/kubernetes/pkg/apis/extensions/v1beta1"
printersinternal "k8s.io/kubernetes/pkg/printers/internalversion"
printerstorage "k8s.io/kubernetes/pkg/printers/storage"
// DeploymentStorage includes dummy storage for Deployments and for Scale subresource.
type DeploymentStorage struct {
Deployment *REST
Status *StatusREST
Scale *ScaleREST
Rollback *RollbackREST
func NewStorage(optsGetter generic.RESTOptionsGetter) DeploymentStorage {
deploymentRest, deploymentStatusRest, deploymentRollbackRest := NewREST(optsGetter)
return DeploymentStorage{
Deployment: deploymentRest,
Status: deploymentStatusRest,
Scale: &ScaleREST{store: deploymentRest.Store},
Rollback: deploymentRollbackRest,
type REST struct {
categories []string
// NewREST returns a RESTStorage object that will work against deployments.
func NewREST(optsGetter generic.RESTOptionsGetter) (*REST, *StatusREST, *RollbackREST) {
store := &genericregistry.Store{
NewFunc: func() runtime.Object { return &apps.Deployment{} },
NewListFunc: func() runtime.Object { return &apps.DeploymentList{} },
DefaultQualifiedResource: apps.Resource("deployments"),
CreateStrategy: deployment.Strategy,
UpdateStrategy: deployment.Strategy,
DeleteStrategy: deployment.Strategy,
TableConvertor: printerstorage.TableConvertor{TablePrinter: printers.NewTablePrinter().With(printersinternal.AddHandlers)},
options := &generic.StoreOptions{RESTOptions: optsGetter}
if err := store.CompleteWithOptions(options); err != nil {
panic(err) // TODO: Propagate error up
statusStore := *store
statusStore.UpdateStrategy = deployment.StatusStrategy
return &REST{store, []string{"all"}}, &StatusREST{store: &statusStore}, &RollbackREST{store: store}
// Implement ShortNamesProvider
var _ rest.ShortNamesProvider = &REST{}
// ShortNames implements the ShortNamesProvider interface. Returns a list of short names for a resource.
func (r *REST) ShortNames() []string {
return []string{"deploy"}
// Implement CategoriesProvider
var _ rest.CategoriesProvider = &REST{}
// Categories implements the CategoriesProvider interface. Returns a list of categories a resource is part of.
func (r *REST) Categories() []string {
return r.categories
func (r *REST) WithCategories(categories []string) *REST {
r.categories = categories
return r
// StatusREST implements the REST endpoint for changing the status of a deployment
type StatusREST struct {
store *genericregistry.Store
func (r *StatusREST) New() runtime.Object {
return &apps.Deployment{}
// Get retrieves the object from the storage. It is required to support Patch.
func (r *StatusREST) Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error) {
return r.store.Get(ctx, name, options)
// Update alters the status subset of an object.
func (r *StatusREST) Update(ctx context.Context, name string, objInfo rest.UpdatedObjectInfo, createValidation rest.ValidateObjectFunc, updateValidation rest.ValidateObjectUpdateFunc, forceAllowCreate bool, options *metav1.UpdateOptions) (runtime.Object, bool, error) {
// We are explicitly setting forceAllowCreate to false in the call to the underlying storage because
// subresources should never allow create on update.
return r.store.Update(ctx, name, objInfo, createValidation, updateValidation, false, options)
// RollbackREST implements the REST endpoint for initiating the rollback of a deployment
type RollbackREST struct {
store *genericregistry.Store
// ProducesMIMETypes returns a list of the MIME types the specified HTTP verb (GET, POST, DELETE,
// PATCH) can respond with.
func (r *RollbackREST) ProducesMIMETypes(verb string) []string {
return nil
// ProducesObject returns an object the specified HTTP verb respond with. It will overwrite storage object if
// it is not nil. Only the type of the return object matters, the value will be ignored.
func (r *RollbackREST) ProducesObject(verb string) interface{} {
return metav1.Status{}
var _ = rest.StorageMetadata(&RollbackREST{})
// New creates a rollback
func (r *RollbackREST) New() runtime.Object {
return &apps.DeploymentRollback{}
var _ = rest.Creater(&RollbackREST{})
func (r *RollbackREST) Create(ctx context.Context, obj runtime.Object, createValidation rest.ValidateObjectFunc, options *metav1.CreateOptions) (runtime.Object, error) {
rollback, ok := obj.(*apps.DeploymentRollback)
if !ok {
return nil, errors.NewBadRequest(fmt.Sprintf("not a DeploymentRollback: %#v", obj))
if createValidation != nil {
if err := createValidation(obj.DeepCopyObject()); err != nil {
return nil, err
if errs := appsvalidation.ValidateDeploymentRollback(rollback); len(errs) != 0 {
return nil, errors.NewInvalid(apps.Kind("DeploymentRollback"), rollback.Name, errs)
// Update the Deployment with information in DeploymentRollback to trigger rollback
err := r.rollbackDeployment(ctx, rollback.Name, &rollback.RollbackTo, rollback.UpdatedAnnotations, dryrun.IsDryRun(options.DryRun))
if err != nil {
return nil, err
return &metav1.Status{
Status: metav1.StatusSuccess,
Message: fmt.Sprintf("rollback request for deployment %q succeeded", rollback.Name),
Code: http.StatusOK,
}, nil
func (r *RollbackREST) rollbackDeployment(ctx context.Context, deploymentID string, config *apps.RollbackConfig, annotations map[string]string, dryRun bool) error {
if _, err := r.setDeploymentRollback(ctx, deploymentID, config, annotations, dryRun); err != nil {
err = storeerr.InterpretGetError(err, apps.Resource("deployments"), deploymentID)
err = storeerr.InterpretUpdateError(err, apps.Resource("deployments"), deploymentID)
if _, ok := err.(*errors.StatusError); !ok {
err = errors.NewInternalError(err)
return err
return nil
func (r *RollbackREST) setDeploymentRollback(ctx context.Context, deploymentID string, config *apps.RollbackConfig, annotations map[string]string, dryRun bool) (*apps.Deployment, error) {
dKey, err := r.store.KeyFunc(ctx, deploymentID)
if err != nil {
return nil, err
var finalDeployment *apps.Deployment
err = r.store.Storage.GuaranteedUpdate(ctx, dKey, &apps.Deployment{}, false, nil, storage.SimpleUpdate(func(obj runtime.Object) (runtime.Object, error) {
d, ok := obj.(*apps.Deployment)
if !ok {
return nil, fmt.Errorf("unexpected object: %#v", obj)
if d.Annotations == nil {
d.Annotations = make(map[string]string)
for k, v := range annotations {
d.Annotations[k] = v
d.Spec.RollbackTo = config
finalDeployment = d
return d, nil
}), dryRun)
return finalDeployment, err
type ScaleREST struct {
store *genericregistry.Store
// ScaleREST implements Patcher
var _ = rest.Patcher(&ScaleREST{})
var _ = rest.GroupVersionKindProvider(&ScaleREST{})
func (r *ScaleREST) GroupVersionKind(containingGV schema.GroupVersion) schema.GroupVersionKind {
switch containingGV {
case extensionsv1beta1.SchemeGroupVersion:
return extensionsv1beta1.SchemeGroupVersion.WithKind("Scale")
case appsv1beta1.SchemeGroupVersion:
return appsv1beta1.SchemeGroupVersion.WithKind("Scale")
case appsv1beta2.SchemeGroupVersion:
return appsv1beta2.SchemeGroupVersion.WithKind("Scale")
return autoscalingv1.SchemeGroupVersion.WithKind("Scale")
// New creates a new Scale object
func (r *ScaleREST) New() runtime.Object {
return &autoscaling.Scale{}
func (r *ScaleREST) Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error) {
obj, err := r.store.Get(ctx, name, options)
if err != nil {
return nil, errors.NewNotFound(apps.Resource("deployments/scale"), name)
deployment := obj.(*apps.Deployment)
scale, err := scaleFromDeployment(deployment)
if err != nil {
return nil, errors.NewBadRequest(fmt.Sprintf("%v", err))
return scale, nil
func (r *ScaleREST) Update(ctx context.Context, name string, objInfo rest.UpdatedObjectInfo, createValidation rest.ValidateObjectFunc, updateValidation rest.ValidateObjectUpdateFunc, forceAllowCreate bool, options *metav1.UpdateOptions) (runtime.Object, bool, error) {
obj, err := r.store.Get(ctx, name, &metav1.GetOptions{})
if err != nil {
return nil, false, errors.NewNotFound(apps.Resource("deployments/scale"), name)
deployment := obj.(*apps.Deployment)
oldScale, err := scaleFromDeployment(deployment)
if err != nil {
return nil, false, err
obj, err = objInfo.UpdatedObject(ctx, oldScale)
if err != nil {
return nil, false, err
if obj == nil {
return nil, false, errors.NewBadRequest(fmt.Sprintf("nil update passed to Scale"))
scale, ok := obj.(*autoscaling.Scale)
if !ok {
return nil, false, errors.NewBadRequest(fmt.Sprintf("expected input object type to be Scale, but %T", obj))
if errs := autoscalingvalidation.ValidateScale(scale); len(errs) > 0 {
return nil, false, errors.NewInvalid(autoscaling.Kind("Scale"), name, errs)
deployment.Spec.Replicas = scale.Spec.Replicas
deployment.ResourceVersion = scale.ResourceVersion
obj, _, err = r.store.Update(ctx, deployment.Name, rest.DefaultUpdatedObjectInfo(deployment), createValidation, updateValidation, false, options)
if err != nil {
return nil, false, err
deployment = obj.(*apps.Deployment)
newScale, err := scaleFromDeployment(deployment)
if err != nil {
return nil, false, errors.NewBadRequest(fmt.Sprintf("%v", err))
return newScale, false, nil
// scaleFromDeployment returns a scale subresource for a deployment.
func scaleFromDeployment(deployment *apps.Deployment) (*autoscaling.Scale, error) {
selector, err := metav1.LabelSelectorAsSelector(deployment.Spec.Selector)
if err != nil {
return nil, err
return &autoscaling.Scale{
// TODO: Create a variant of ObjectMeta type that only contains the fields below.
ObjectMeta: metav1.ObjectMeta{
Name: deployment.Name,
Namespace: deployment.Namespace,
UID: deployment.UID,
ResourceVersion: deployment.ResourceVersion,
CreationTimestamp: deployment.CreationTimestamp,
Spec: autoscaling.ScaleSpec{
Replicas: deployment.Spec.Replicas,
Status: autoscaling.ScaleStatus{
Replicas: deployment.Status.Replicas,
Selector: selector.String(),
}, nil

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