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server.go
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server.go
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/*
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 defaultserver
import (
"fmt"
"os"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/manager"
logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
"sigs.k8s.io/controller-runtime/pkg/webhook"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission/builder"
)
var (
log = logf.Log.WithName("default_server")
builderMap = map[string]*builder.WebhookBuilder{}
// HandlerMap contains all admission webhook handlers.
HandlerMap = map[string][]admission.Handler{}
)
// Add adds itself to the manager
func Add(mgr manager.Manager) error {
ns := os.Getenv("POD_NAMESPACE")
if len(ns) == 0 {
ns = "default"
}
secretName := os.Getenv("SECRET_NAME")
if len(secretName) == 0 {
secretName = "webhook-server-secret"
}
svr, err := webhook.NewServer("foo-admission-server", mgr, webhook.ServerOptions{
// TODO(user): change the configuration of ServerOptions based on your need.
Port: 9876,
CertDir: "/tmp/cert",
BootstrapOptions: &webhook.BootstrapOptions{
Secret: &types.NamespacedName{
Namespace: ns,
Name: secretName,
},
Service: &webhook.Service{
Namespace: ns,
Name: "webhook-server-service",
// Selectors should select the pods that runs this webhook server.
Selectors: map[string]string{
"control-plane": "controller-manager",
},
},
},
})
if err != nil {
return err
}
var webhooks []webhook.Webhook
for k, builder := range builderMap {
handlers, ok := HandlerMap[k]
if !ok {
log.V(1).Info(fmt.Sprintf("can't find handlers for builder: %v", k))
handlers = []admission.Handler{}
}
wh, err := builder.
Handlers(handlers...).
WithManager(mgr).
Build()
if err != nil {
return err
}
webhooks = append(webhooks, wh)
}
return svr.Register(webhooks...)
}