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customresource_handler.go
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customresource_handler.go
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/*
Copyright 2017 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
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 apiserver
import (
"fmt"
"net/http"
"path"
"sort"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/go-openapi/spec"
"github.com/go-openapi/strfmt"
"github.com/go-openapi/validate"
apiextensionshelpers "k8s.io/apiextensions-apiserver/pkg/apihelpers"
apiextensionsinternal "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
"k8s.io/apiextensions-apiserver/pkg/apiserver/conversion"
structuralschema "k8s.io/apiextensions-apiserver/pkg/apiserver/schema"
structuraldefaulting "k8s.io/apiextensions-apiserver/pkg/apiserver/schema/defaulting"
schemaobjectmeta "k8s.io/apiextensions-apiserver/pkg/apiserver/schema/objectmeta"
structuralpruning "k8s.io/apiextensions-apiserver/pkg/apiserver/schema/pruning"
apiservervalidation "k8s.io/apiextensions-apiserver/pkg/apiserver/validation"
informers "k8s.io/apiextensions-apiserver/pkg/client/informers/externalversions/apiextensions/v1"
listers "k8s.io/apiextensions-apiserver/pkg/client/listers/apiextensions/v1"
"k8s.io/apiextensions-apiserver/pkg/controller/establish"
"k8s.io/apiextensions-apiserver/pkg/controller/finalizer"
"k8s.io/apiextensions-apiserver/pkg/controller/openapi/builder"
"k8s.io/apiextensions-apiserver/pkg/crdserverscheme"
"k8s.io/apiextensions-apiserver/pkg/registry/customresource"
"k8s.io/apiextensions-apiserver/pkg/registry/customresource/tableconvertor"
apiequality "k8s.io/apimachinery/pkg/api/equality"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/runtime/serializer/json"
"k8s.io/apimachinery/pkg/runtime/serializer/protobuf"
"k8s.io/apimachinery/pkg/runtime/serializer/versioning"
"k8s.io/apimachinery/pkg/types"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/sets"
utilwaitgroup "k8s.io/apimachinery/pkg/util/waitgroup"
"k8s.io/apimachinery/pkg/version"
"k8s.io/apiserver/pkg/admission"
"k8s.io/apiserver/pkg/authorization/authorizer"
"k8s.io/apiserver/pkg/endpoints/handlers"
"k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager"
"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
"k8s.io/apiserver/pkg/endpoints/metrics"
apirequest "k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/apiserver/pkg/features"
"k8s.io/apiserver/pkg/registry/generic"
genericregistry "k8s.io/apiserver/pkg/registry/generic/registry"
genericfilters "k8s.io/apiserver/pkg/server/filters"
"k8s.io/apiserver/pkg/storage/storagebackend"
utilfeature "k8s.io/apiserver/pkg/util/feature"
utilopenapi "k8s.io/apiserver/pkg/util/openapi"
"k8s.io/apiserver/pkg/util/webhook"
"k8s.io/apiserver/pkg/warning"
"k8s.io/client-go/scale"
"k8s.io/client-go/scale/scheme/autoscalingv1"
"k8s.io/client-go/tools/cache"
"k8s.io/klog/v2"
"k8s.io/kube-openapi/pkg/util/proto"
)
// crdHandler serves the `/apis` endpoint.
// This is registered as a filter so that it never collides with any explicitly registered endpoints
type crdHandler struct {
versionDiscoveryHandler *versionDiscoveryHandler
groupDiscoveryHandler *groupDiscoveryHandler
customStorageLock sync.Mutex
// customStorage contains a crdStorageMap
// atomic.Value has a very good read performance compared to sync.RWMutex
// see https://gist.github.com/dim/152e6bf80e1384ea72e17ac717a5000a
// which is suited for most read and rarely write cases
customStorage atomic.Value
crdLister listers.CustomResourceDefinitionLister
hasSynced func() bool
delegate http.Handler
restOptionsGetter generic.RESTOptionsGetter
admission admission.Interface
establishingController *establish.EstablishingController
// MasterCount is used to implement sleep to improve
// CRD establishing process for HA clusters.
masterCount int
converterFactory *conversion.CRConverterFactory
// so that we can do create on update.
authorizer authorizer.Authorizer
// request timeout we should delay storage teardown for
requestTimeout time.Duration
// minRequestTimeout applies to CR's list/watch calls
minRequestTimeout time.Duration
// staticOpenAPISpec is used as a base for the schema of CR's for the
// purpose of managing fields, it is how CR handlers get the structure
// of TypeMeta and ObjectMeta
staticOpenAPISpec *spec.Swagger
// The limit on the request size that would be accepted and decoded in a write request
// 0 means no limit.
maxRequestBodyBytes int64
}
// crdInfo stores enough information to serve the storage for the custom resource
type crdInfo struct {
// spec and acceptedNames are used to compare against if a change is made on a CRD. We only update
// the storage if one of these changes.
spec *apiextensionsv1.CustomResourceDefinitionSpec
acceptedNames *apiextensionsv1.CustomResourceDefinitionNames
// Deprecated per version
deprecated map[string]bool
// Warnings per version
warnings map[string][]string
// Storage per version
storages map[string]customresource.CustomResourceStorage
// Request scope per version
requestScopes map[string]*handlers.RequestScope
// Scale scope per version
scaleRequestScopes map[string]*handlers.RequestScope
// Status scope per version
statusRequestScopes map[string]*handlers.RequestScope
// storageVersion is the CRD version used when storing the object in etcd.
storageVersion string
waitGroup *utilwaitgroup.SafeWaitGroup
}
// crdStorageMap goes from customresourcedefinition to its storage
type crdStorageMap map[types.UID]*crdInfo
func NewCustomResourceDefinitionHandler(
versionDiscoveryHandler *versionDiscoveryHandler,
groupDiscoveryHandler *groupDiscoveryHandler,
crdInformer informers.CustomResourceDefinitionInformer,
delegate http.Handler,
restOptionsGetter generic.RESTOptionsGetter,
admission admission.Interface,
establishingController *establish.EstablishingController,
serviceResolver webhook.ServiceResolver,
authResolverWrapper webhook.AuthenticationInfoResolverWrapper,
masterCount int,
authorizer authorizer.Authorizer,
requestTimeout time.Duration,
minRequestTimeout time.Duration,
staticOpenAPISpec *spec.Swagger,
maxRequestBodyBytes int64) (*crdHandler, error) {
ret := &crdHandler{
versionDiscoveryHandler: versionDiscoveryHandler,
groupDiscoveryHandler: groupDiscoveryHandler,
customStorage: atomic.Value{},
crdLister: crdInformer.Lister(),
hasSynced: crdInformer.Informer().HasSynced,
delegate: delegate,
restOptionsGetter: restOptionsGetter,
admission: admission,
establishingController: establishingController,
masterCount: masterCount,
authorizer: authorizer,
requestTimeout: requestTimeout,
minRequestTimeout: minRequestTimeout,
staticOpenAPISpec: staticOpenAPISpec,
maxRequestBodyBytes: maxRequestBodyBytes,
}
crdInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: ret.createCustomResourceDefinition,
UpdateFunc: ret.updateCustomResourceDefinition,
DeleteFunc: func(obj interface{}) {
ret.removeDeadStorage()
},
})
crConverterFactory, err := conversion.NewCRConverterFactory(serviceResolver, authResolverWrapper)
if err != nil {
return nil, err
}
ret.converterFactory = crConverterFactory
ret.customStorage.Store(crdStorageMap{})
return ret, nil
}
// watches are expected to handle storage disruption gracefully,
// both on the server-side (by terminating the watch connection)
// and on the client side (by restarting the watch)
var longRunningFilter = genericfilters.BasicLongRunningRequestCheck(sets.NewString("watch"), sets.NewString())
// possiblyAcrossAllNamespacesVerbs contains those verbs which can be per-namespace and across all
// namespaces for namespaces resources. I.e. for these an empty namespace in the requestInfo is fine.
var possiblyAcrossAllNamespacesVerbs = sets.NewString("list", "watch")
func (r *crdHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
requestInfo, ok := apirequest.RequestInfoFrom(ctx)
if !ok {
responsewriters.ErrorNegotiated(
apierrors.NewInternalError(fmt.Errorf("no RequestInfo found in the context")),
Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req,
)
return
}
if !requestInfo.IsResourceRequest {
pathParts := splitPath(requestInfo.Path)
// only match /apis/<group>/<version>
// only registered under /apis
if len(pathParts) == 3 {
if !r.hasSynced() {
responsewriters.ErrorNegotiated(serverStartingError(), Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req)
return
}
r.versionDiscoveryHandler.ServeHTTP(w, req)
return
}
// only match /apis/<group>
if len(pathParts) == 2 {
if !r.hasSynced() {
responsewriters.ErrorNegotiated(serverStartingError(), Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req)
return
}
r.groupDiscoveryHandler.ServeHTTP(w, req)
return
}
r.delegate.ServeHTTP(w, req)
return
}
crdName := requestInfo.Resource + "." + requestInfo.APIGroup
crd, err := r.crdLister.Get(crdName)
if apierrors.IsNotFound(err) {
if !r.hasSynced() {
responsewriters.ErrorNegotiated(serverStartingError(), Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req)
return
}
r.delegate.ServeHTTP(w, req)
return
}
if err != nil {
utilruntime.HandleError(err)
responsewriters.ErrorNegotiated(
apierrors.NewInternalError(fmt.Errorf("error resolving resource")),
Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req,
)
return
}
// if the scope in the CRD and the scope in request differ (with exception of the verbs in possiblyAcrossAllNamespacesVerbs
// for namespaced resources), pass request to the delegate, which is supposed to lead to a 404.
namespacedCRD, namespacedReq := crd.Spec.Scope == apiextensionsv1.NamespaceScoped, len(requestInfo.Namespace) > 0
if !namespacedCRD && namespacedReq {
r.delegate.ServeHTTP(w, req)
return
}
if namespacedCRD && !namespacedReq && !possiblyAcrossAllNamespacesVerbs.Has(requestInfo.Verb) {
r.delegate.ServeHTTP(w, req)
return
}
if !apiextensionshelpers.HasServedCRDVersion(crd, requestInfo.APIVersion) {
r.delegate.ServeHTTP(w, req)
return
}
// There is a small chance that a CRD is being served because NamesAccepted condition is true,
// but it becomes "unserved" because another names update leads to a conflict
// and EstablishingController wasn't fast enough to put the CRD into the Established condition.
// We accept this as the problem is small and self-healing.
if !apiextensionshelpers.IsCRDConditionTrue(crd, apiextensionsv1.NamesAccepted) &&
!apiextensionshelpers.IsCRDConditionTrue(crd, apiextensionsv1.Established) {
r.delegate.ServeHTTP(w, req)
return
}
terminating := apiextensionshelpers.IsCRDConditionTrue(crd, apiextensionsv1.Terminating)
crdInfo, err := r.getOrCreateServingInfoFor(crd.UID, crd.Name)
if apierrors.IsNotFound(err) {
r.delegate.ServeHTTP(w, req)
return
}
if err != nil {
utilruntime.HandleError(err)
responsewriters.ErrorNegotiated(
apierrors.NewInternalError(fmt.Errorf("error resolving resource")),
Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req,
)
return
}
if !hasServedCRDVersion(crdInfo.spec, requestInfo.APIVersion) {
r.delegate.ServeHTTP(w, req)
return
}
deprecated := crdInfo.deprecated[requestInfo.APIVersion]
for _, w := range crdInfo.warnings[requestInfo.APIVersion] {
warning.AddWarning(req.Context(), "", w)
}
verb := strings.ToUpper(requestInfo.Verb)
resource := requestInfo.Resource
subresource := requestInfo.Subresource
scope := metrics.CleanScope(requestInfo)
supportedTypes := []string{
string(types.JSONPatchType),
string(types.MergePatchType),
}
if utilfeature.DefaultFeatureGate.Enabled(features.ServerSideApply) {
supportedTypes = append(supportedTypes, string(types.ApplyPatchType))
}
var handlerFunc http.HandlerFunc
subresources, err := apiextensionshelpers.GetSubresourcesForVersion(crd, requestInfo.APIVersion)
if err != nil {
utilruntime.HandleError(err)
responsewriters.ErrorNegotiated(
apierrors.NewInternalError(fmt.Errorf("could not properly serve the subresource")),
Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req,
)
return
}
switch {
case subresource == "status" && subresources != nil && subresources.Status != nil:
handlerFunc = r.serveStatus(w, req, requestInfo, crdInfo, terminating, supportedTypes)
case subresource == "scale" && subresources != nil && subresources.Scale != nil:
handlerFunc = r.serveScale(w, req, requestInfo, crdInfo, terminating, supportedTypes)
case len(subresource) == 0:
handlerFunc = r.serveResource(w, req, requestInfo, crdInfo, terminating, supportedTypes)
default:
responsewriters.ErrorNegotiated(
apierrors.NewNotFound(schema.GroupResource{Group: requestInfo.APIGroup, Resource: requestInfo.Resource}, requestInfo.Name),
Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req,
)
}
if handlerFunc != nil {
handlerFunc = metrics.InstrumentHandlerFunc(verb, requestInfo.APIGroup, requestInfo.APIVersion, resource, subresource, scope, metrics.APIServerComponent, deprecated, "", handlerFunc)
handler := genericfilters.WithWaitGroup(handlerFunc, longRunningFilter, crdInfo.waitGroup)
handler.ServeHTTP(w, req)
return
}
}
func (r *crdHandler) serveResource(w http.ResponseWriter, req *http.Request, requestInfo *apirequest.RequestInfo, crdInfo *crdInfo, terminating bool, supportedTypes []string) http.HandlerFunc {
requestScope := crdInfo.requestScopes[requestInfo.APIVersion]
storage := crdInfo.storages[requestInfo.APIVersion].CustomResource
switch requestInfo.Verb {
case "get":
return handlers.GetResource(storage, storage, requestScope)
case "list":
forceWatch := false
return handlers.ListResource(storage, storage, requestScope, forceWatch, r.minRequestTimeout)
case "watch":
forceWatch := true
return handlers.ListResource(storage, storage, requestScope, forceWatch, r.minRequestTimeout)
case "create":
if terminating {
err := apierrors.NewMethodNotSupported(schema.GroupResource{Group: requestInfo.APIGroup, Resource: requestInfo.Resource}, requestInfo.Verb)
err.ErrStatus.Message = fmt.Sprintf("%v not allowed while custom resource definition is terminating", requestInfo.Verb)
responsewriters.ErrorNegotiated(err, Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req)
return nil
}
return handlers.CreateResource(storage, requestScope, r.admission)
case "update":
return handlers.UpdateResource(storage, requestScope, r.admission)
case "patch":
return handlers.PatchResource(storage, requestScope, r.admission, supportedTypes)
case "delete":
allowsOptions := true
return handlers.DeleteResource(storage, allowsOptions, requestScope, r.admission)
case "deletecollection":
checkBody := true
return handlers.DeleteCollection(storage, checkBody, requestScope, r.admission)
default:
responsewriters.ErrorNegotiated(
apierrors.NewMethodNotSupported(schema.GroupResource{Group: requestInfo.APIGroup, Resource: requestInfo.Resource}, requestInfo.Verb),
Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req,
)
return nil
}
}
func (r *crdHandler) serveStatus(w http.ResponseWriter, req *http.Request, requestInfo *apirequest.RequestInfo, crdInfo *crdInfo, terminating bool, supportedTypes []string) http.HandlerFunc {
requestScope := crdInfo.statusRequestScopes[requestInfo.APIVersion]
storage := crdInfo.storages[requestInfo.APIVersion].Status
switch requestInfo.Verb {
case "get":
return handlers.GetResource(storage, nil, requestScope)
case "update":
return handlers.UpdateResource(storage, requestScope, r.admission)
case "patch":
return handlers.PatchResource(storage, requestScope, r.admission, supportedTypes)
default:
responsewriters.ErrorNegotiated(
apierrors.NewMethodNotSupported(schema.GroupResource{Group: requestInfo.APIGroup, Resource: requestInfo.Resource}, requestInfo.Verb),
Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req,
)
return nil
}
}
func (r *crdHandler) serveScale(w http.ResponseWriter, req *http.Request, requestInfo *apirequest.RequestInfo, crdInfo *crdInfo, terminating bool, supportedTypes []string) http.HandlerFunc {
requestScope := crdInfo.scaleRequestScopes[requestInfo.APIVersion]
storage := crdInfo.storages[requestInfo.APIVersion].Scale
switch requestInfo.Verb {
case "get":
return handlers.GetResource(storage, nil, requestScope)
case "update":
return handlers.UpdateResource(storage, requestScope, r.admission)
case "patch":
return handlers.PatchResource(storage, requestScope, r.admission, supportedTypes)
default:
responsewriters.ErrorNegotiated(
apierrors.NewMethodNotSupported(schema.GroupResource{Group: requestInfo.APIGroup, Resource: requestInfo.Resource}, requestInfo.Verb),
Codecs, schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}, w, req,
)
return nil
}
}
// createCustomResourceDefinition removes potentially stale storage so it gets re-created
func (r *crdHandler) createCustomResourceDefinition(obj interface{}) {
crd := obj.(*apiextensionsv1.CustomResourceDefinition)
r.customStorageLock.Lock()
defer r.customStorageLock.Unlock()
// this could happen if the create event is merged from create-update events
r.removeStorage_locked(crd.UID)
}
// updateCustomResourceDefinition removes potentially stale storage so it gets re-created
func (r *crdHandler) updateCustomResourceDefinition(oldObj, newObj interface{}) {
oldCRD := oldObj.(*apiextensionsv1.CustomResourceDefinition)
newCRD := newObj.(*apiextensionsv1.CustomResourceDefinition)
r.customStorageLock.Lock()
defer r.customStorageLock.Unlock()
// Add CRD to the establishing controller queue.
// For HA clusters, we want to prevent race conditions when changing status to Established,
// so we want to be sure that CRD is Installing at least for 5 seconds before Establishing it.
// TODO: find a real HA safe checkpointing mechanism instead of an arbitrary wait.
if !apiextensionshelpers.IsCRDConditionTrue(newCRD, apiextensionsv1.Established) &&
apiextensionshelpers.IsCRDConditionTrue(newCRD, apiextensionsv1.NamesAccepted) {
if r.masterCount > 1 {
r.establishingController.QueueCRD(newCRD.Name, 5*time.Second)
} else {
r.establishingController.QueueCRD(newCRD.Name, 0)
}
}
if oldCRD.UID != newCRD.UID {
r.removeStorage_locked(oldCRD.UID)
}
storageMap := r.customStorage.Load().(crdStorageMap)
oldInfo, found := storageMap[newCRD.UID]
if !found {
return
}
if apiequality.Semantic.DeepEqual(&newCRD.Spec, oldInfo.spec) && apiequality.Semantic.DeepEqual(&newCRD.Status.AcceptedNames, oldInfo.acceptedNames) {
klog.V(6).Infof("Ignoring customresourcedefinition %s update because neither spec, nor accepted names changed", oldCRD.Name)
return
}
klog.V(4).Infof("Updating customresourcedefinition %s", newCRD.Name)
r.removeStorage_locked(newCRD.UID)
}
// removeStorage_locked removes the cached storage with the given uid as key from the storage map. This function
// updates r.customStorage with the cleaned-up storageMap and tears down the old storage.
// NOTE: Caller MUST hold r.customStorageLock to write r.customStorage thread-safely.
func (r *crdHandler) removeStorage_locked(uid types.UID) {
storageMap := r.customStorage.Load().(crdStorageMap)
if oldInfo, ok := storageMap[uid]; ok {
// Copy because we cannot write to storageMap without a race
// as it is used without locking elsewhere.
storageMap2 := storageMap.clone()
// Remove from the CRD info map and store the map
delete(storageMap2, uid)
r.customStorage.Store(storageMap2)
// Tear down the old storage
go r.tearDown(oldInfo)
}
}
// removeDeadStorage removes REST storage that isn't being used
func (r *crdHandler) removeDeadStorage() {
allCustomResourceDefinitions, err := r.crdLister.List(labels.Everything())
if err != nil {
utilruntime.HandleError(err)
return
}
r.customStorageLock.Lock()
defer r.customStorageLock.Unlock()
storageMap := r.customStorage.Load().(crdStorageMap)
// Copy because we cannot write to storageMap without a race
storageMap2 := make(crdStorageMap)
for _, crd := range allCustomResourceDefinitions {
if _, ok := storageMap[crd.UID]; ok {
storageMap2[crd.UID] = storageMap[crd.UID]
}
}
r.customStorage.Store(storageMap2)
for uid, crdInfo := range storageMap {
if _, ok := storageMap2[uid]; !ok {
klog.V(4).Infof("Removing dead CRD storage for %s/%s", crdInfo.spec.Group, crdInfo.spec.Names.Kind)
go r.tearDown(crdInfo)
}
}
}
// Wait up to a minute for requests to drain, then tear down storage
func (r *crdHandler) tearDown(oldInfo *crdInfo) {
requestsDrained := make(chan struct{})
go func() {
defer close(requestsDrained)
// Allow time for in-flight requests with a handle to the old info to register themselves
time.Sleep(time.Second)
// Wait for in-flight requests to drain
oldInfo.waitGroup.Wait()
}()
select {
case <-time.After(r.requestTimeout * 2):
klog.Warningf("timeout waiting for requests to drain for %s/%s, tearing down storage", oldInfo.spec.Group, oldInfo.spec.Names.Kind)
case <-requestsDrained:
}
for _, storage := range oldInfo.storages {
// destroy only the main storage. Those for the subresources share cacher and etcd clients.
storage.CustomResource.DestroyFunc()
}
}
// GetCustomResourceListerCollectionDeleter returns the ListerCollectionDeleter of
// the given crd.
func (r *crdHandler) GetCustomResourceListerCollectionDeleter(crd *apiextensionsv1.CustomResourceDefinition) (finalizer.ListerCollectionDeleter, error) {
info, err := r.getOrCreateServingInfoFor(crd.UID, crd.Name)
if err != nil {
return nil, err
}
return info.storages[info.storageVersion].CustomResource, nil
}
// getOrCreateServingInfoFor gets the CRD serving info for the given CRD UID if the key exists in the storage map.
// Otherwise the function fetches the up-to-date CRD using the given CRD name and creates CRD serving info.
func (r *crdHandler) getOrCreateServingInfoFor(uid types.UID, name string) (*crdInfo, error) {
storageMap := r.customStorage.Load().(crdStorageMap)
if ret, ok := storageMap[uid]; ok {
return ret, nil
}
r.customStorageLock.Lock()
defer r.customStorageLock.Unlock()
// Get the up-to-date CRD when we have the lock, to avoid racing with updateCustomResourceDefinition.
// If updateCustomResourceDefinition sees an update and happens later, the storage will be deleted and
// we will re-create the updated storage on demand. If updateCustomResourceDefinition happens before,
// we make sure that we observe the same up-to-date CRD.
crd, err := r.crdLister.Get(name)
if err != nil {
return nil, err
}
storageMap = r.customStorage.Load().(crdStorageMap)
if ret, ok := storageMap[crd.UID]; ok {
return ret, nil
}
storageVersion, err := apiextensionshelpers.GetCRDStorageVersion(crd)
if err != nil {
return nil, err
}
// Scope/Storages per version.
requestScopes := map[string]*handlers.RequestScope{}
storages := map[string]customresource.CustomResourceStorage{}
statusScopes := map[string]*handlers.RequestScope{}
scaleScopes := map[string]*handlers.RequestScope{}
deprecated := map[string]bool{}
warnings := map[string][]string{}
equivalentResourceRegistry := runtime.NewEquivalentResourceRegistry()
structuralSchemas := map[string]*structuralschema.Structural{}
for _, v := range crd.Spec.Versions {
val, err := apiextensionshelpers.GetSchemaForVersion(crd, v.Name)
if err != nil {
utilruntime.HandleError(err)
return nil, fmt.Errorf("the server could not properly serve the CR schema")
}
if val == nil {
continue
}
internalValidation := &apiextensionsinternal.CustomResourceValidation{}
if err := apiextensionsv1.Convert_v1_CustomResourceValidation_To_apiextensions_CustomResourceValidation(val, internalValidation, nil); err != nil {
return nil, fmt.Errorf("failed converting CRD validation to internal version: %v", err)
}
s, err := structuralschema.NewStructural(internalValidation.OpenAPIV3Schema)
if crd.Spec.PreserveUnknownFields == false && err != nil {
// This should never happen. If it does, it is a programming error.
utilruntime.HandleError(fmt.Errorf("failed to convert schema to structural: %v", err))
return nil, fmt.Errorf("the server could not properly serve the CR schema") // validation should avoid this
}
if crd.Spec.PreserveUnknownFields == false {
// we don't own s completely, e.g. defaults are not deep-copied. So better make a copy here.
s = s.DeepCopy()
if err := structuraldefaulting.PruneDefaults(s); err != nil {
// This should never happen. If it does, it is a programming error.
utilruntime.HandleError(fmt.Errorf("failed to prune defaults: %v", err))
return nil, fmt.Errorf("the server could not properly serve the CR schema") // validation should avoid this
}
}
structuralSchemas[v.Name] = s
}
openAPIModels, err := buildOpenAPIModelsForApply(r.staticOpenAPISpec, crd)
if err != nil {
utilruntime.HandleError(fmt.Errorf("error building openapi models for %s: %v", crd.Name, err))
openAPIModels = nil
}
safeConverter, unsafeConverter, err := r.converterFactory.NewConverter(crd)
if err != nil {
return nil, err
}
for _, v := range crd.Spec.Versions {
// In addition to Unstructured objects (Custom Resources), we also may sometimes need to
// decode unversioned Options objects, so we delegate to parameterScheme for such types.
parameterScheme := runtime.NewScheme()
parameterScheme.AddUnversionedTypes(schema.GroupVersion{Group: crd.Spec.Group, Version: v.Name},
&metav1.ListOptions{},
&metav1.ExportOptions{},
&metav1.GetOptions{},
&metav1.DeleteOptions{},
)
parameterCodec := runtime.NewParameterCodec(parameterScheme)
resource := schema.GroupVersionResource{Group: crd.Spec.Group, Version: v.Name, Resource: crd.Status.AcceptedNames.Plural}
kind := schema.GroupVersionKind{Group: crd.Spec.Group, Version: v.Name, Kind: crd.Status.AcceptedNames.Kind}
equivalentResourceRegistry.RegisterKindFor(resource, "", kind)
typer := newUnstructuredObjectTyper(parameterScheme)
creator := unstructuredCreator{}
validationSchema, err := apiextensionshelpers.GetSchemaForVersion(crd, v.Name)
if err != nil {
utilruntime.HandleError(err)
return nil, fmt.Errorf("the server could not properly serve the CR schema")
}
var internalValidationSchema *apiextensionsinternal.CustomResourceValidation
if validationSchema != nil {
internalValidationSchema = &apiextensionsinternal.CustomResourceValidation{}
if err := apiextensionsv1.Convert_v1_CustomResourceValidation_To_apiextensions_CustomResourceValidation(validationSchema, internalValidationSchema, nil); err != nil {
return nil, fmt.Errorf("failed to convert CRD validation to internal version: %v", err)
}
}
validator, _, err := apiservervalidation.NewSchemaValidator(internalValidationSchema)
if err != nil {
return nil, err
}
var statusSpec *apiextensionsinternal.CustomResourceSubresourceStatus
var statusValidator *validate.SchemaValidator
subresources, err := apiextensionshelpers.GetSubresourcesForVersion(crd, v.Name)
if err != nil {
utilruntime.HandleError(err)
return nil, fmt.Errorf("the server could not properly serve the CR subresources")
}
if subresources != nil && subresources.Status != nil {
equivalentResourceRegistry.RegisterKindFor(resource, "status", kind)
statusSpec = &apiextensionsinternal.CustomResourceSubresourceStatus{}
if err := apiextensionsv1.Convert_v1_CustomResourceSubresourceStatus_To_apiextensions_CustomResourceSubresourceStatus(subresources.Status, statusSpec, nil); err != nil {
return nil, fmt.Errorf("failed converting CRD status subresource to internal version: %v", err)
}
// for the status subresource, validate only against the status schema
if internalValidationSchema != nil && internalValidationSchema.OpenAPIV3Schema != nil && internalValidationSchema.OpenAPIV3Schema.Properties != nil {
if statusSchema, ok := internalValidationSchema.OpenAPIV3Schema.Properties["status"]; ok {
openapiSchema := &spec.Schema{}
if err := apiservervalidation.ConvertJSONSchemaPropsWithPostProcess(&statusSchema, openapiSchema, apiservervalidation.StripUnsupportedFormatsPostProcess); err != nil {
return nil, err
}
statusValidator = validate.NewSchemaValidator(openapiSchema, nil, "", strfmt.Default)
}
}
}
var scaleSpec *apiextensionsinternal.CustomResourceSubresourceScale
if subresources != nil && subresources.Scale != nil {
equivalentResourceRegistry.RegisterKindFor(resource, "scale", autoscalingv1.SchemeGroupVersion.WithKind("Scale"))
scaleSpec = &apiextensionsinternal.CustomResourceSubresourceScale{}
if err := apiextensionsv1.Convert_v1_CustomResourceSubresourceScale_To_apiextensions_CustomResourceSubresourceScale(subresources.Scale, scaleSpec, nil); err != nil {
return nil, fmt.Errorf("failed converting CRD status subresource to internal version: %v", err)
}
}
columns, err := getColumnsForVersion(crd, v.Name)
if err != nil {
utilruntime.HandleError(err)
return nil, fmt.Errorf("the server could not properly serve the CR columns")
}
table, err := tableconvertor.New(columns)
if err != nil {
klog.V(2).Infof("The CRD for %v has an invalid printer specification, falling back to default printing: %v", kind, err)
}
storages[v.Name] = customresource.NewStorage(
resource.GroupResource(),
kind,
schema.GroupVersionKind{Group: crd.Spec.Group, Version: v.Name, Kind: crd.Status.AcceptedNames.ListKind},
customresource.NewStrategy(
typer,
crd.Spec.Scope == apiextensionsv1.NamespaceScoped,
kind,
validator,
statusValidator,
structuralSchemas,
statusSpec,
scaleSpec,
),
crdConversionRESTOptionsGetter{
RESTOptionsGetter: r.restOptionsGetter,
converter: safeConverter,
decoderVersion: schema.GroupVersion{Group: crd.Spec.Group, Version: v.Name},
encoderVersion: schema.GroupVersion{Group: crd.Spec.Group, Version: storageVersion},
structuralSchemas: structuralSchemas,
structuralSchemaGK: kind.GroupKind(),
preserveUnknownFields: crd.Spec.PreserveUnknownFields,
},
crd.Status.AcceptedNames.Categories,
table,
)
selfLinkPrefix := ""
switch crd.Spec.Scope {
case apiextensionsv1.ClusterScoped:
selfLinkPrefix = "/" + path.Join("apis", crd.Spec.Group, v.Name) + "/" + crd.Status.AcceptedNames.Plural + "/"
case apiextensionsv1.NamespaceScoped:
selfLinkPrefix = "/" + path.Join("apis", crd.Spec.Group, v.Name, "namespaces") + "/"
}
clusterScoped := crd.Spec.Scope == apiextensionsv1.ClusterScoped
// CRDs explicitly do not support protobuf, but some objects returned by the API server do
negotiatedSerializer := unstructuredNegotiatedSerializer{
typer: typer,
creator: creator,
converter: safeConverter,
structuralSchemas: structuralSchemas,
structuralSchemaGK: kind.GroupKind(),
preserveUnknownFields: crd.Spec.PreserveUnknownFields,
}
var standardSerializers []runtime.SerializerInfo
for _, s := range negotiatedSerializer.SupportedMediaTypes() {
if s.MediaType == runtime.ContentTypeProtobuf {
continue
}
standardSerializers = append(standardSerializers, s)
}
requestScopes[v.Name] = &handlers.RequestScope{
Namer: handlers.ContextBasedNaming{
SelfLinker: meta.NewAccessor(),
ClusterScoped: clusterScoped,
SelfLinkPathPrefix: selfLinkPrefix,
},
Serializer: negotiatedSerializer,
ParameterCodec: parameterCodec,
StandardSerializers: standardSerializers,
Creater: creator,
Convertor: safeConverter,
Defaulter: unstructuredDefaulter{parameterScheme, structuralSchemas, kind.GroupKind()},
Typer: typer,
UnsafeConvertor: unsafeConverter,
EquivalentResourceMapper: equivalentResourceRegistry,
Resource: schema.GroupVersionResource{Group: crd.Spec.Group, Version: v.Name, Resource: crd.Status.AcceptedNames.Plural},
Kind: kind,
// a handler for a specific group-version of a custom resource uses that version as the in-memory representation
HubGroupVersion: kind.GroupVersion(),
MetaGroupVersion: metav1.SchemeGroupVersion,
TableConvertor: storages[v.Name].CustomResource,
Authorizer: r.authorizer,
MaxRequestBodyBytes: r.maxRequestBodyBytes,
}
if utilfeature.DefaultFeatureGate.Enabled(features.ServerSideApply) {
reqScope := *requestScopes[v.Name]
reqScope.FieldManager, err = fieldmanager.NewDefaultCRDFieldManager(
openAPIModels,
reqScope.Convertor,
reqScope.Defaulter,
reqScope.Creater,
reqScope.Kind,
reqScope.HubGroupVersion,
crd.Spec.PreserveUnknownFields,
false,
)
if err != nil {
return nil, err
}
requestScopes[v.Name] = &reqScope
}
// override scaleSpec subresource values
// shallow copy
scaleScope := *requestScopes[v.Name]
scaleConverter := scale.NewScaleConverter()
scaleScope.Subresource = "scale"
scaleScope.Serializer = serializer.NewCodecFactory(scaleConverter.Scheme())
scaleScope.Kind = autoscalingv1.SchemeGroupVersion.WithKind("Scale")
scaleScope.Namer = handlers.ContextBasedNaming{
SelfLinker: meta.NewAccessor(),
ClusterScoped: clusterScoped,
SelfLinkPathPrefix: selfLinkPrefix,
SelfLinkPathSuffix: "/scale",
}
// TODO(issues.k8s.io/82046): We can't effectively track ownership on scale requests yet.
scaleScope.FieldManager = nil
scaleScopes[v.Name] = &scaleScope
// override status subresource values
// shallow copy
statusScope := *requestScopes[v.Name]
if utilfeature.DefaultFeatureGate.Enabled(features.ServerSideApply) {
statusScope.FieldManager, err = fieldmanager.NewDefaultCRDFieldManager(
openAPIModels,
statusScope.Convertor,
statusScope.Defaulter,
statusScope.Creater,
statusScope.Kind,
statusScope.HubGroupVersion,
crd.Spec.PreserveUnknownFields,
true,
)
if err != nil {
return nil, err
}
}
statusScope.Subresource = "status"
statusScope.Namer = handlers.ContextBasedNaming{
SelfLinker: meta.NewAccessor(),
ClusterScoped: clusterScoped,
SelfLinkPathPrefix: selfLinkPrefix,
SelfLinkPathSuffix: "/status",
}
statusScopes[v.Name] = &statusScope
if v.Deprecated {
deprecated[v.Name] = true
if utilfeature.DefaultFeatureGate.Enabled(features.WarningHeaders) {
if v.DeprecationWarning != nil {
warnings[v.Name] = append(warnings[v.Name], *v.DeprecationWarning)
} else {
warnings[v.Name] = append(warnings[v.Name], defaultDeprecationWarning(v.Name, crd.Spec))
}
}
}
}
ret := &crdInfo{
spec: &crd.Spec,
acceptedNames: &crd.Status.AcceptedNames,
storages: storages,
requestScopes: requestScopes,
scaleRequestScopes: scaleScopes,
statusRequestScopes: statusScopes,
deprecated: deprecated,
warnings: warnings,
storageVersion: storageVersion,
waitGroup: &utilwaitgroup.SafeWaitGroup{},
}
// Copy because we cannot write to storageMap without a race
// as it is used without locking elsewhere.
storageMap2 := storageMap.clone()
storageMap2[crd.UID] = ret
r.customStorage.Store(storageMap2)
return ret, nil
}
func defaultDeprecationWarning(deprecatedVersion string, crd apiextensionsv1.CustomResourceDefinitionSpec) string {
msg := fmt.Sprintf("%s/%s %s is deprecated", crd.Group, deprecatedVersion, crd.Names.Kind)
var servedNonDeprecatedVersions []string
for _, v := range crd.Versions {
if v.Served && !v.Deprecated && version.CompareKubeAwareVersionStrings(deprecatedVersion, v.Name) < 0 {
servedNonDeprecatedVersions = append(servedNonDeprecatedVersions, v.Name)
}
}
if len(servedNonDeprecatedVersions) == 0 {
return msg
}
sort.Slice(servedNonDeprecatedVersions, func(i, j int) bool {
return version.CompareKubeAwareVersionStrings(servedNonDeprecatedVersions[i], servedNonDeprecatedVersions[j]) > 0
})
msg += fmt.Sprintf("; use %s/%s %s", crd.Group, servedNonDeprecatedVersions[0], crd.Names.Kind)
return msg
}
type unstructuredNegotiatedSerializer struct {
typer runtime.ObjectTyper
creator runtime.ObjectCreater
converter runtime.ObjectConvertor
structuralSchemas map[string]*structuralschema.Structural // by version
structuralSchemaGK schema.GroupKind
preserveUnknownFields bool
}
func (s unstructuredNegotiatedSerializer) SupportedMediaTypes() []runtime.SerializerInfo {
return []runtime.SerializerInfo{
{
MediaType: "application/json",
MediaTypeType: "application",
MediaTypeSubType: "json",
EncodesAsText: true,
Serializer: json.NewSerializer(json.DefaultMetaFactory, s.creator, s.typer, false),
PrettySerializer: json.NewSerializer(json.DefaultMetaFactory, s.creator, s.typer, true),
StreamSerializer: &runtime.StreamSerializerInfo{
EncodesAsText: true,
Serializer: json.NewSerializer(json.DefaultMetaFactory, s.creator, s.typer, false),
Framer: json.Framer,
},
},
{
MediaType: "application/yaml",
MediaTypeType: "application",
MediaTypeSubType: "yaml",
EncodesAsText: true,
Serializer: json.NewYAMLSerializer(json.DefaultMetaFactory, s.creator, s.typer),
},
{
MediaType: "application/vnd.kubernetes.protobuf",
MediaTypeType: "application",
MediaTypeSubType: "vnd.kubernetes.protobuf",
Serializer: protobuf.NewSerializer(s.creator, s.typer),
StreamSerializer: &runtime.StreamSerializerInfo{
Serializer: protobuf.NewRawSerializer(s.creator, s.typer),
Framer: protobuf.LengthDelimitedFramer,
},
},
}