apiextensions.go

Documentation: k8s.io/kubernetes/pkg/controlplane/apiserver

     1  /*
     2  Copyright 2023 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package apiserver
    18  
    19  import (
    20  	"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
    21  	"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
    22  	apiextensionsapiserver "k8s.io/apiextensions-apiserver/pkg/apiserver"
    23  	apiextensionsoptions "k8s.io/apiextensions-apiserver/pkg/cmd/server/options"
    24  	"k8s.io/apimachinery/pkg/runtime"
    25  	"k8s.io/apimachinery/pkg/runtime/schema"
    26  	"k8s.io/apiserver/pkg/admission"
    27  	"k8s.io/apiserver/pkg/server"
    28  	"k8s.io/apiserver/pkg/util/webhook"
    29  	"k8s.io/client-go/informers"
    30  
    31  	controlplaneapiserver "k8s.io/kubernetes/pkg/controlplane/apiserver/options"
    32  )
    33  
    34  func CreateAPIExtensionsConfig(
    35  	kubeAPIServerConfig server.Config,
    36  	kubeInformers informers.SharedInformerFactory,
    37  	pluginInitializers []admission.PluginInitializer,
    38  	commandOptions controlplaneapiserver.CompletedOptions,
    39  	masterCount int,
    40  	serviceResolver webhook.ServiceResolver,
    41  	authResolverWrapper webhook.AuthenticationInfoResolverWrapper,
    42  ) (*apiextensionsapiserver.Config, error) {
    43  	// make a shallow copy to let us twiddle a few things
    44  	// most of the config actually remains the same.  We only need to mess with a couple items related to the particulars of the apiextensions
    45  	genericConfig := kubeAPIServerConfig
    46  	genericConfig.PostStartHooks = map[string]server.PostStartHookConfigEntry{}
    47  	genericConfig.RESTOptionsGetter = nil
    48  
    49  	// copy the etcd options so we don't mutate originals.
    50  	// we assume that the etcd options have been completed already.  avoid messing with anything outside
    51  	// of changes to StorageConfig as that may lead to unexpected behavior when the options are applied.
    52  	etcdOptions := *commandOptions.Etcd
    53  	// this is where the true decodable levels come from.
    54  	etcdOptions.StorageConfig.Codec = apiextensionsapiserver.Codecs.LegacyCodec(v1beta1.SchemeGroupVersion, v1.SchemeGroupVersion)
    55  	// prefer the more compact serialization (v1beta1) for storage until https://issue.k8s.io/82292 is resolved for objects whose v1 serialization is too big but whose v1beta1 serialization can be stored
    56  	etcdOptions.StorageConfig.EncodeVersioner = runtime.NewMultiGroupVersioner(v1beta1.SchemeGroupVersion, schema.GroupKind{Group: v1beta1.GroupName})
    57  	etcdOptions.SkipHealthEndpoints = true // avoid double wiring of health checks
    58  	if err := etcdOptions.ApplyTo(&genericConfig); err != nil {
    59  		return nil, err
    60  	}
    61  
    62  	// override MergedResourceConfig with apiextensions defaults and registry
    63  	if err := commandOptions.APIEnablement.ApplyTo(
    64  		&genericConfig,
    65  		apiextensionsapiserver.DefaultAPIResourceConfigSource(),
    66  		apiextensionsapiserver.Scheme); err != nil {
    67  		return nil, err
    68  	}
    69  	apiextensionsConfig := &apiextensionsapiserver.Config{
    70  		GenericConfig: &server.RecommendedConfig{
    71  			Config:                genericConfig,
    72  			SharedInformerFactory: kubeInformers,
    73  		},
    74  		ExtraConfig: apiextensionsapiserver.ExtraConfig{
    75  			CRDRESTOptionsGetter: apiextensionsoptions.NewCRDRESTOptionsGetter(etcdOptions, genericConfig.ResourceTransformers, genericConfig.StorageObjectCountTracker),
    76  			MasterCount:          masterCount,
    77  			AuthResolverWrapper:  authResolverWrapper,
    78  			ServiceResolver:      serviceResolver,
    79  		},
    80  	}
    81  
    82  	// we need to clear the poststarthooks so we don't add them multiple times to all the servers (that fails)
    83  	apiextensionsConfig.GenericConfig.PostStartHooks = map[string]server.PostStartHookConfigEntry{}
    84  
    85  	return apiextensionsConfig, nil
    86  }
    87
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