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start.go
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start.go
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/*
Copyright 2016 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 server
import (
"fmt"
"io"
"net"
"github.com/spf13/cobra"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apiserver/pkg/admission"
genericapiserver "k8s.io/apiserver/pkg/server"
genericoptions "k8s.io/apiserver/pkg/server/options"
"k8s.io/sample-apiserver/pkg/admission/plugin/banflunder"
"k8s.io/sample-apiserver/pkg/admission/wardleinitializer"
"k8s.io/sample-apiserver/pkg/apis/wardle/v1alpha1"
"k8s.io/sample-apiserver/pkg/apiserver"
clientset "k8s.io/sample-apiserver/pkg/client/clientset/internalversion"
informers "k8s.io/sample-apiserver/pkg/client/informers/internalversion"
)
const defaultEtcdPathPrefix = "/registry/wardle.kubernetes.io"
type WardleServerOptions struct {
RecommendedOptions *genericoptions.RecommendedOptions
SharedInformerFactory informers.SharedInformerFactory
StdOut io.Writer
StdErr io.Writer
}
func NewWardleServerOptions(out, errOut io.Writer) *WardleServerOptions {
o := &WardleServerOptions{
RecommendedOptions: genericoptions.NewRecommendedOptions(defaultEtcdPathPrefix, apiserver.Codecs.LegacyCodec(v1alpha1.SchemeGroupVersion)),
StdOut: out,
StdErr: errOut,
}
return o
}
// NewCommandStartWardleServer provides a CLI handler for 'start master' command
// with a default WardleServerOptions.
func NewCommandStartWardleServer(defaults *WardleServerOptions, stopCh <-chan struct{}) *cobra.Command {
o := *defaults
cmd := &cobra.Command{
Short: "Launch a wardle API server",
Long: "Launch a wardle API server",
RunE: func(c *cobra.Command, args []string) error {
if err := o.Complete(); err != nil {
return err
}
if err := o.Validate(args); err != nil {
return err
}
if err := o.RunWardleServer(stopCh); err != nil {
return err
}
return nil
},
}
flags := cmd.Flags()
o.RecommendedOptions.AddFlags(flags)
return cmd
}
func (o WardleServerOptions) Validate(args []string) error {
errors := []error{}
errors = append(errors, o.RecommendedOptions.Validate()...)
return utilerrors.NewAggregate(errors)
}
func (o *WardleServerOptions) Complete() error {
return nil
}
func (o *WardleServerOptions) Config() (*apiserver.Config, error) {
// register admission plugins
banflunder.Register(o.RecommendedOptions.Admission.Plugins)
// TODO have a "real" external address
if err := o.RecommendedOptions.SecureServing.MaybeDefaultWithSelfSignedCerts("localhost", nil, []net.IP{net.ParseIP("127.0.0.1")}); err != nil {
return nil, fmt.Errorf("error creating self-signed certificates: %v", err)
}
o.RecommendedOptions.ExtraAdmissionInitializers = func(c *genericapiserver.RecommendedConfig) ([]admission.PluginInitializer, error) {
client, err := clientset.NewForConfig(c.LoopbackClientConfig)
if err != nil {
return nil, err
}
informerFactory := informers.NewSharedInformerFactory(client, c.LoopbackClientConfig.Timeout)
o.SharedInformerFactory = informerFactory
return []admission.PluginInitializer{wardleinitializer.New(informerFactory)}, nil
}
serverConfig := genericapiserver.NewRecommendedConfig(apiserver.Codecs)
if err := o.RecommendedOptions.ApplyTo(serverConfig, apiserver.Scheme); err != nil {
return nil, err
}
config := &apiserver.Config{
GenericConfig: serverConfig,
ExtraConfig: apiserver.ExtraConfig{},
}
return config, nil
}
func (o WardleServerOptions) RunWardleServer(stopCh <-chan struct{}) error {
config, err := o.Config()
if err != nil {
return err
}
server, err := config.Complete().New()
if err != nil {
return err
}
server.GenericAPIServer.AddPostStartHook("start-sample-server-informers", func(context genericapiserver.PostStartHookContext) error {
config.GenericConfig.SharedInformerFactory.Start(context.StopCh)
return nil
})
return server.GenericAPIServer.PrepareRun().Run(stopCh)
}