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conversion.go
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conversion.go
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package conversion
import (
"encoding/json"
"fmt"
"io"
"net/http"
"github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"sigs.k8s.io/controller-runtime/pkg/conversion"
apiextv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
longhornV1beta1 "github.com/longhorn/longhorn-manager/k8s/pkg/apis/longhorn/v1beta1"
longhorn "github.com/longhorn/longhorn-manager/k8s/pkg/apis/longhorn/v1beta2"
)
type Handler struct {
scheme *runtime.Scheme
decoder *Decoder
logger logrus.FieldLogger
}
func NewHandler() (*Handler, error) {
scheme := runtime.NewScheme()
if err := longhornV1beta1.SchemeBuilder.AddToScheme(scheme); err != nil {
return nil, err
}
if err := longhorn.SchemeBuilder.AddToScheme(scheme); err != nil {
return nil, err
}
return &Handler{
scheme: scheme,
decoder: NewDecoder(scheme),
logger: logrus.StandardLogger().WithField("service", "conversionWebhook"),
}, nil
}
func (h *Handler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
var body []byte
if req.Body != nil {
if data, err := io.ReadAll(req.Body); err == nil {
body = data
}
}
convertReview := apiextv1.ConversionReview{}
err := h.decoder.DecodeInto(body, &convertReview)
if err != nil {
h.logger.WithError(err).Error("Failed to decode conversion request")
rw.WriteHeader(http.StatusInternalServerError)
return
}
convertReview.Response = h.handleConvertRequest(convertReview.Request)
convertReview.Response.UID = convertReview.Request.UID
err = json.NewEncoder(rw).Encode(&convertReview)
if err != nil {
h.logger.WithError(err).Error("Failed to encode conversion request")
rw.WriteHeader(http.StatusInternalServerError)
return
}
}
// handleConvertRequest handles a version conversion request.
func (h *Handler) handleConvertRequest(req *apiextv1.ConversionRequest) *apiextv1.ConversionResponse {
var convertedObjects []runtime.RawExtension
for _, obj := range req.Objects {
src, gvk, err := h.decoder.Decode(obj.Raw)
if err != nil {
h.logger.WithError(err).Error("Failed to decode src object")
}
dst, err := getTargetObject(h.scheme, req.DesiredAPIVersion, gvk.Kind)
if err != nil {
h.logger.WithError(err).Error("Failed to get destination object")
return conversionResponseFailureWithMessagef("error converting object")
}
err = h.convertObject(src, dst)
if err != nil {
h.logger.WithError(err).Error("Failed to convert object")
return conversionResponseFailureWithMessagef("error converting object")
}
convertedObjects = append(convertedObjects, runtime.RawExtension{Object: dst})
}
return &apiextv1.ConversionResponse{
ConvertedObjects: convertedObjects,
Result: statusSucceed(),
}
}
func (h *Handler) convertObject(src, dst runtime.Object) error {
if src.GetObjectKind().GroupVersionKind().String() == dst.GetObjectKind().GroupVersionKind().String() {
return fmt.Errorf("conversion is not allowed between same type %T", src)
}
srcIsHub, dstIsHub := isHub(src), isHub(dst)
srcIsConvertible, dstIsConvertible := isConvertible(src), isConvertible(dst)
if srcIsHub {
if dstIsConvertible {
return dst.(conversion.Convertible).ConvertFrom(src.(conversion.Hub))
}
// this is error case.
return fmt.Errorf("%T is not convertible to", src)
}
if dstIsHub {
if srcIsConvertible {
return src.(conversion.Convertible).ConvertTo(dst.(conversion.Hub))
}
// this is error case.
return fmt.Errorf("%T is not convertible", src)
}
// neither src nor dst are Hub, means both of them are spoke, so lets get the hub
// version type.
hub, err := getHub(h.scheme, src)
if err != nil {
return err
}
// src and dst needs to be convertible for it to work
if !srcIsConvertible || !dstIsConvertible {
return fmt.Errorf("%T and %T needs to be both convertible", src, dst)
}
err = src.(conversion.Convertible).ConvertTo(hub)
if err != nil {
return fmt.Errorf("%T failed to convert to hub version %T : %v", src, hub, err)
}
err = dst.(conversion.Convertible).ConvertFrom(hub)
if err != nil {
return fmt.Errorf("%T failed to convert from hub version %T : %v", dst, hub, err)
}
return nil
}
func getHub(scheme *runtime.Scheme, obj runtime.Object) (conversion.Hub, error) {
gvks, _, err := scheme.ObjectKinds(obj)
if err != nil {
return nil, fmt.Errorf("failed to retrieve object kinds for given object : %v", err)
}
var hub conversion.Hub
hubFoundAlready := false
var isHub bool
for _, gvk := range gvks {
o, _ := scheme.New(gvk)
if hub, isHub = o.(conversion.Hub); isHub {
if hubFoundAlready {
// multiple hub found, error case
return nil, fmt.Errorf("multiple hub version defined")
}
hubFoundAlready = true
}
}
return hub, nil
}
func getTargetObject(scheme *runtime.Scheme, apiVersion, kind string) (runtime.Object, error) {
gvk := schema.FromAPIVersionAndKind(apiVersion, kind)
obj, err := scheme.New(gvk)
if err != nil {
return obj, err
}
t, err := meta.TypeAccessor(obj)
if err != nil {
return obj, err
}
t.SetAPIVersion(apiVersion)
t.SetKind(kind)
return obj, nil
}
// conversionResponseFailureWithMessagef is a helper function to create an ConversionResponse
// with a formatted embedded error message
func conversionResponseFailureWithMessagef(msg string, params ...interface{}) *apiextv1.ConversionResponse {
return &apiextv1.ConversionResponse{
Result: metav1.Status{
Message: fmt.Sprintf(msg, params...),
Status: metav1.StatusFailure,
},
}
}
// statusErrorWithMessage is a helper function to create an metav1 failure status
// with an error message
func statusErrorWithMessage(msg string, params ...interface{}) metav1.Status {
return metav1.Status{
Message: fmt.Sprintf(msg, params...),
Status: metav1.StatusFailure,
}
}
// statusSucceed is a helper function to create a metav1 success status
func statusSucceed() metav1.Status {
return metav1.Status{Status: metav1.StatusSuccess}
}
// isHub is a function to identify the runtime object is a hub or not
func isHub(obj runtime.Object) bool {
_, yes := obj.(conversion.Hub)
return yes
}
// isConvertible is a function to identify the runtime object is convertible or not
func isConvertible(obj runtime.Object) bool {
_, yes := obj.(conversion.Convertible)
return yes
}