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apiserver.go
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apiserver.go
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// Copyright 2022 Antrea 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 (
"context"
"net"
logger "github.com/go-logr/logr"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/version"
"k8s.io/apiserver/pkg/registry/rest"
genericapiserver "k8s.io/apiserver/pkg/server"
genericoptions "k8s.io/apiserver/pkg/server/options"
"k8s.io/client-go/tools/cache"
controllerruntime "sigs.k8s.io/controller-runtime"
runtimev1alpha1 "antrea.io/nephe/apis/runtime/v1alpha1"
"antrea.io/nephe/pkg/apiserver/registry/virtualmachinepolicy"
)
var (
// APIService listening port number.
apiServerPort = 5443
// Match Nephe Controller Service Name
nepheControllerSvcName = "nephe-controller-service"
// Match Nephe Controller Service Domain Name
nepheControllerDomainName = "nephe-controller-service.nephe-system.svc"
)
// ExtraConfig holds custom apiserver config.
type ExtraConfig struct {
// virtual machine policy indexer.
vmpIndexer cache.Indexer
}
// Config defines the config for the apiserver.
type Config struct {
GenericConfig *genericapiserver.RecommendedConfig
ExtraConfig ExtraConfig
}
func NewConfig(codecs serializer.CodecFactory, indexer cache.Indexer) (*Config, error) {
recommend := genericoptions.NewRecommendedOptions("", nil)
serverConfig := genericapiserver.NewRecommendedConfig(codecs)
recommend.SecureServing.BindPort = apiServerPort
// tls.crt and tls.key is populated by cert-manager injector.
recommend.SecureServing.ServerCert.PairName = "tls"
recommend.SecureServing.ServerCert.CertDirectory = "/tmp/k8s-apiserver/serving-certs"
if err := recommend.SecureServing.MaybeDefaultWithSelfSignedCerts(nepheControllerSvcName,
[]string{nepheControllerDomainName}, []net.IP{net.ParseIP("127.0.0.1")}); err != nil {
return nil, err
}
if err := recommend.SecureServing.ApplyTo(&serverConfig.SecureServing, &serverConfig.LoopbackClientConfig); err != nil {
return nil, err
}
if err := recommend.Authentication.ApplyTo(&serverConfig.Authentication, serverConfig.SecureServing,
serverConfig.OpenAPIConfig); err != nil {
return nil, err
}
if err := recommend.Authorization.ApplyTo(&serverConfig.Authorization); err != nil {
return nil, err
}
config := &Config{
GenericConfig: serverConfig,
ExtraConfig: ExtraConfig{
vmpIndexer: indexer,
},
}
return config, nil
}
// NepheControllerAPIServer contains state for a Kubernetes cluster master/api server.
type NepheControllerAPIServer struct {
genericAPIServer *genericapiserver.GenericAPIServer
logger logger.Logger
}
func (s *NepheControllerAPIServer) Start(stop context.Context) error {
s.logger.Info("Starting APIServer")
err := s.genericAPIServer.PrepareRun().Run(stop.Done())
if err != nil {
s.logger.Error(err, "Failed to run APIServer")
}
return err
}
func (s *NepheControllerAPIServer) SetupWithManager(
mgr controllerruntime.Manager,
indexer cache.Indexer,
logger logger.Logger) error {
s.logger = logger
codecs := serializer.NewCodecFactory(mgr.GetScheme())
apiConfig, err := NewConfig(codecs, indexer)
if err != nil {
s.logger.Error(err, "unable to create APIServer config")
return err
}
s.genericAPIServer, err = apiConfig.Complete().New(mgr.GetScheme(), codecs, s.logger)
if err != nil {
s.logger.Error(err, "unable to create APIServer")
return err
}
if err = mgr.Add(s); err != nil {
return err
}
return nil
}
type completedConfig struct {
GenericConfig genericapiserver.CompletedConfig
ExtraConfig *ExtraConfig
}
// CompletedConfig embeds a private pointer that cannot be instantiated outside of this package.
type CompletedConfig struct {
*completedConfig
}
// Complete fills in any fields not set that are required to have valid data. It's mutating the receiver.
func (cfg *Config) Complete() CompletedConfig {
c := completedConfig{
cfg.GenericConfig.Complete(),
&cfg.ExtraConfig,
}
c.GenericConfig.Version = &version.Info{
Major: "1",
Minor: "0",
}
return CompletedConfig{&c}
}
// New returns a new instance of NepheControllerAPIServer from the given config.
func (c completedConfig) New(scheme *runtime.Scheme, codecs serializer.CodecFactory,
logger logger.Logger) (*genericapiserver.GenericAPIServer, error) {
genericServer, err := c.GenericConfig.New("nephe-controller-apiserver", genericapiserver.NewEmptyDelegate())
if err != nil {
return nil, err
}
vmpStorage := virtualmachinepolicy.NewREST(c.ExtraConfig.vmpIndexer, logger.WithName("VirtualMachinePolicy"))
cpGroup := genericapiserver.NewDefaultAPIGroupInfo(runtimev1alpha1.GroupVersion.Group, scheme, metav1.ParameterCodec, codecs)
cpv1alpha1Storage := map[string]rest.Storage{}
cpv1alpha1Storage["virtualmachinepolicy"] = vmpStorage
cpGroup.VersionedResourcesStorageMap["v1alpha1"] = cpv1alpha1Storage
if err := genericServer.InstallAPIGroup(&cpGroup); err != nil {
return nil, err
}
return genericServer, nil
}