mirror of https://github.com/k3s-io/k3s
128 lines
4.5 KiB
Go
128 lines
4.5 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package storage
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import (
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"strings"
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"sync/atomic"
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"k8s.io/apimachinery/pkg/api/errors"
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metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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genericapirequest "k8s.io/apiserver/pkg/endpoints/request"
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"k8s.io/apiserver/pkg/registry/generic"
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genericregistry "k8s.io/apiserver/pkg/registry/generic/registry"
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"k8s.io/apiserver/pkg/registry/rest"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/apis/extensions"
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"k8s.io/kubernetes/pkg/registry/cachesize"
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"k8s.io/kubernetes/pkg/registry/extensions/thirdpartyresourcedata"
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)
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// errFrozen is a transient error to indicate that clients should retry with backoff.
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var errFrozen = errors.NewServiceUnavailable("TPR data is temporarily frozen")
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// REST implements a RESTStorage for ThirdPartyResourceData.
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type REST struct {
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*genericregistry.Store
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kind string
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frozen atomic.Value
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}
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// Freeze causes all future calls to Create/Update/Delete/DeleteCollection to return a transient error.
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// This is irreversible and meant for use when the TPR data is being deleted or migrated/abandoned.
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func (r *REST) Freeze() {
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r.frozen.Store(true)
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}
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func (r *REST) isFrozen() bool {
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return r.frozen.Load() != nil
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}
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// Create is a wrapper to support Freeze.
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func (r *REST) Create(ctx genericapirequest.Context, obj runtime.Object, includeUninitialized bool) (runtime.Object, error) {
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if r.isFrozen() {
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return nil, errFrozen
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}
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return r.Store.Create(ctx, obj, includeUninitialized)
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}
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// Update is a wrapper to support Freeze.
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func (r *REST) Update(ctx genericapirequest.Context, name string, objInfo rest.UpdatedObjectInfo) (runtime.Object, bool, error) {
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if r.isFrozen() {
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return nil, false, errFrozen
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}
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return r.Store.Update(ctx, name, objInfo)
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}
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// Delete is a wrapper to support Freeze.
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func (r *REST) Delete(ctx genericapirequest.Context, name string, options *metav1.DeleteOptions) (runtime.Object, bool, error) {
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if r.isFrozen() {
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return nil, false, errFrozen
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}
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return r.Store.Delete(ctx, name, options)
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}
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// DeleteCollection is a wrapper to support Freeze.
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func (r *REST) DeleteCollection(ctx genericapirequest.Context, options *metav1.DeleteOptions, listOptions *metainternalversion.ListOptions) (runtime.Object, error) {
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if r.isFrozen() {
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return nil, errFrozen
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}
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return r.Store.DeleteCollection(ctx, options, listOptions)
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}
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// NewREST returns a registry which will store ThirdPartyResourceData in the given helper
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func NewREST(optsGetter generic.RESTOptionsGetter, group, kind string) *REST {
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resource := extensions.Resource("thirdpartyresourcedatas")
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opts, err := optsGetter.GetRESTOptions(resource)
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if err != nil {
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panic(err) // TODO: Propagate error up
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}
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// We explicitly do NOT do any decoration here yet.
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opts.Decorator = generic.UndecoratedStorage // TODO use watchCacheSize=-1 to signal UndecoratedStorage
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opts.ResourcePrefix = "/ThirdPartyResourceData/" + group + "/" + strings.ToLower(kind) + "s"
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store := &genericregistry.Store{
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Copier: api.Scheme,
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NewFunc: func() runtime.Object { return &extensions.ThirdPartyResourceData{} },
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NewListFunc: func() runtime.Object { return &extensions.ThirdPartyResourceDataList{} },
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PredicateFunc: thirdpartyresourcedata.Matcher,
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QualifiedResource: resource,
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WatchCacheSize: cachesize.GetWatchCacheSizeByResource(resource.Resource),
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CreateStrategy: thirdpartyresourcedata.Strategy,
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UpdateStrategy: thirdpartyresourcedata.Strategy,
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DeleteStrategy: thirdpartyresourcedata.Strategy,
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}
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options := &generic.StoreOptions{RESTOptions: opts, AttrFunc: thirdpartyresourcedata.GetAttrs} // Pass in opts to use UndecoratedStorage and custom ResourcePrefix
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if err := store.CompleteWithOptions(options); err != nil {
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panic(err) // TODO: Propagate error up
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}
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return &REST{
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Store: store,
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kind: kind,
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}
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}
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// Implements the rest.KindProvider interface
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func (r *REST) Kind() string {
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return r.kind
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}
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