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server.go
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server.go
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package server
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
admissionv1 "k8s.io/api/admission/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/klog"
"k8s.io/client-go/kubernetes"
)
var ex evictionExtender
// toAdmissionResponse is a helper function to create an AdmissionResponse
// with an embedded error
func toAdmissionResponse(err error) *admissionv1.AdmissionResponse {
return &admissionv1.AdmissionResponse{
Result: &metav1.Status{
Message: err.Error(),
},
}
}
// admitFunc is the type we use for all of our validators and mutators
type admitFunc func(admissionv1.AdmissionReview) *admissionv1.AdmissionResponse
// serve handles the http portion of a request prior to handing to an admit
// function
func serve(w http.ResponseWriter, r *http.Request, admit admitFunc) {
klog.Errorf("attempting to read body")
var body []byte
if r.Body != nil {
if data, err := ioutil.ReadAll(r.Body); err == nil {
body = data
}
}
// verify the content type is accurate
contentType := r.Header.Get("Content-Type")
if contentType != "application/json" {
klog.Errorf("contentType=%s, expect application/json", contentType)
return
}
klog.V(2).Info(fmt.Sprintf("header: %s", r.Header))
klog.V(2).Info(fmt.Sprintf("handling request: %s", body))
deserializer := codecs.UniversalDeserializer()
obj, gvk, err := deserializer.Decode(body, nil, nil)
if err != nil {
msg := fmt.Sprintf("Request could not be decoded: %v", err)
klog.Error(msg)
http.Error(w, msg, http.StatusBadRequest)
return
}
var responseObj runtime.Object
switch *gvk {
case admissionv1.SchemeGroupVersion.WithKind("AdmissionReview"):
requestedAdmissionReview, ok := obj.(*admissionv1.AdmissionReview)
if !ok {
klog.Errorf("Expected admissionv1.AdmissionReview but got: %T", obj)
return
}
responseAdmissionReview := &admissionv1.AdmissionReview{}
responseAdmissionReview.SetGroupVersionKind(*gvk)
responseAdmissionReview.Response = admit(*requestedAdmissionReview)
responseAdmissionReview.Response.UID = requestedAdmissionReview.Request.UID
responseObj = responseAdmissionReview
default:
msg := fmt.Sprintf("Unsupported group version kind: %v", gvk)
klog.Error(msg)
http.Error(w, msg, http.StatusBadRequest)
return
}
klog.V(2).Info(fmt.Sprintf("sending response: %v", responseObj))
respBytes, err := json.Marshal(responseObj)
if err != nil {
klog.Error(err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
if _, err := w.Write(respBytes); err != nil {
klog.Error(err)
}
}
func serveEvictionCreate(w http.ResponseWriter, r *http.Request) {
serve(w, r, ex.evictionCreate)
}
func Serve(certfile string, keyfile string, port int, kclient *kubernetes.Clientset) {
var config = Config{CertFile: certfile, KeyFile: keyfile}
ex = evictionExtender{kclient: kclient}
http.HandleFunc("/eviction", serveEvictionCreate)
server := &http.Server{
Addr: fmt.Sprintf(":%v", port),
TLSConfig: configTLS(config),
}
klog.Errorf(fmt.Sprintf("starting server on %v", port))
server.ListenAndServeTLS("", "")
}