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service.go
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service.go
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package filters
import (
"context"
"fmt"
"io/ioutil"
"net/http"
"github.com/loft-sh/vcluster/pkg/util/clienthelper"
"github.com/loft-sh/vcluster/pkg/util/encoding"
"github.com/loft-sh/vcluster/pkg/util/random"
requestpkg "github.com/loft-sh/vcluster/pkg/util/request"
"github.com/loft-sh/vcluster/pkg/util/translate"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
kerrors "k8s.io/apimachinery/pkg/api/errors"
metainternalversionscheme "k8s.io/apimachinery/pkg/apis/meta/internalversion/scheme"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
"k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/klog"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
)
func WithServiceCreateRedirect(handler http.Handler, localManager ctrl.Manager, virtualManager ctrl.Manager, targetNamespace string) http.Handler {
decoder := encoding.NewDecoder(localManager.GetScheme(), false)
s := serializer.NewCodecFactory(virtualManager.GetScheme())
uncachedLocalClient, err := client.New(localManager.GetConfig(), client.Options{
Scheme: localManager.GetScheme(),
Mapper: localManager.GetRESTMapper(),
})
if err != nil {
panic(err)
}
uncachedVirtualClient, err := client.New(virtualManager.GetConfig(), client.Options{
Scheme: virtualManager.GetScheme(),
Mapper: virtualManager.GetRESTMapper(),
})
if err != nil {
panic(err)
}
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
info, ok := request.RequestInfoFrom(req.Context())
if !ok {
requestpkg.FailWithStatus(w, req, http.StatusInternalServerError, fmt.Errorf("request info is missing"))
return
}
userInfo, ok := request.UserFrom(req.Context())
if !ok {
requestpkg.FailWithStatus(w, req, http.StatusInternalServerError, fmt.Errorf("user info is missing"))
return
}
if info.APIVersion == corev1.SchemeGroupVersion.Version && info.APIGroup == corev1.SchemeGroupVersion.Group && info.Resource == "services" && info.Subresource == "" {
if info.Verb == "create" {
options := &metav1.CreateOptions{}
if err := metainternalversionscheme.ParameterCodec.DecodeParameters(req.URL.Query(), metav1.SchemeGroupVersion, options); err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
if len(options.DryRun) == 0 {
uncachedVirtualImpersonatingClient, err := clienthelper.NewImpersonatingClient(virtualManager.GetConfig(), virtualManager.GetRESTMapper(), userInfo, virtualManager.GetScheme())
if err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
svc, err := createService(req, decoder, uncachedLocalClient, uncachedVirtualImpersonatingClient, info.Namespace, targetNamespace)
if err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
responsewriters.WriteObjectNegotiated(s, negotiation.DefaultEndpointRestrictions, corev1.SchemeGroupVersion, w, req, http.StatusCreated, svc)
return
}
} else if info.Verb == "update" {
options := &metav1.UpdateOptions{}
if err := metainternalversionscheme.ParameterCodec.DecodeParameters(req.URL.Query(), metav1.SchemeGroupVersion, options); err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
if len(options.DryRun) == 0 {
// the only case we have to intercept this is when the service type changes from ExternalName
vService := &corev1.Service{}
err := uncachedVirtualClient.Get(req.Context(), client.ObjectKey{Namespace: info.Namespace, Name: info.Name}, vService)
if err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
if vService.Spec.Type == corev1.ServiceTypeExternalName {
uncachedVirtualImpersonatingClient, err := clienthelper.NewImpersonatingClient(virtualManager.GetConfig(), virtualManager.GetRESTMapper(), userInfo, virtualManager.GetScheme())
if err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
svc, err := updateService(req, decoder, uncachedLocalClient, uncachedVirtualImpersonatingClient, vService, targetNamespace)
if err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
responsewriters.WriteObjectNegotiated(s, negotiation.DefaultEndpointRestrictions, corev1.SchemeGroupVersion, w, req, http.StatusOK, svc)
return
}
}
}
}
handler.ServeHTTP(w, req)
})
}
func updateService(req *http.Request, decoder encoding.Decoder, localClient client.Client, virtualClient client.Client, oldVService *corev1.Service, targetNamespace string) (runtime.Object, error) {
// authorization will be done at this point already, so we can redirect the request to the physical cluster
rawObj, err := ioutil.ReadAll(req.Body)
if err != nil {
return nil, err
}
serviceGVK := corev1.SchemeGroupVersion.WithKind("Service")
svc, err := decoder.Decode(rawObj, &serviceGVK)
if err != nil {
return nil, err
}
newVService, ok := svc.(*corev1.Service)
if !ok {
return nil, fmt.Errorf("expected service object")
}
// type has not changed, we just update here
if newVService.ResourceVersion != oldVService.ResourceVersion || newVService.Spec.Type == oldVService.Spec.Type || newVService.Spec.ClusterIP != "" {
err = virtualClient.Update(req.Context(), newVService)
if err != nil {
return nil, err
}
return newVService, nil
}
// we use a background context from now on as this is a critical operation
ctx := context.Background()
// okay now we have to change the physical service
pService := &corev1.Service{}
err = localClient.Get(ctx, client.ObjectKey{Namespace: targetNamespace, Name: translate.PhysicalName(oldVService.Name, oldVService.Namespace)}, pService)
if err != nil {
if kerrors.IsNotFound(err) {
return nil, kerrors.NewNotFound(corev1.Resource("services"), oldVService.Name)
}
return nil, err
}
// we try to patch the service as this has the best chances to go through
originalPService := pService.DeepCopy()
pService.Spec.Ports = newVService.Spec.Ports
pService.Spec.Type = newVService.Spec.Type
pService.Spec.ClusterIP = ""
err = localClient.Patch(ctx, pService, client.MergeFrom(originalPService))
if err != nil {
return nil, err
}
// now we have the cluster ip that we can apply to the new service
newVService.Spec.ClusterIP = pService.Spec.ClusterIP
err = virtualClient.Update(ctx, newVService)
if err != nil {
// this is actually worst case that can happen, as we have somehow now a really strange
// state in the cluster. This needs to be cleaned up by the controller via delete and create
// and we delete the physical service here. Maybe there is a better solution to this, but for
// now it works
_ = localClient.Delete(ctx, pService)
return nil, err
}
return newVService, nil
}
func createService(req *http.Request, decoder encoding.Decoder, localClient client.Client, virtualClient client.Client, fromNamespace, targetNamespace string) (runtime.Object, error) {
// authorization will be done at this point already, so we can redirect the request to the physical cluster
rawObj, err := ioutil.ReadAll(req.Body)
if err != nil {
return nil, err
}
serviceGVK := corev1.SchemeGroupVersion.WithKind("Service")
svc, err := decoder.Decode(rawObj, &serviceGVK)
if err != nil {
return nil, err
}
vService, ok := svc.(*corev1.Service)
if !ok {
return nil, fmt.Errorf("expected service object")
}
// make sure the namespace is correct and filled
vService.Namespace = fromNamespace
// generate a name, because this field is cleared
if vService.GenerateName != "" && vService.Name == "" {
vService.Name = vService.GenerateName + random.RandomString(5)
}
newObj, err := translate.NewDefaultTranslator(targetNamespace).Translate(vService)
if err != nil {
return nil, errors.Wrap(err, "error setting metadata")
}
newService := newObj.(*corev1.Service)
newService.Spec.Selector = nil
err = localClient.Create(req.Context(), newService)
if err != nil {
klog.Infof("Error creating service in physical cluster: %v", err)
if kerrors.IsAlreadyExists(err) {
return nil, kerrors.NewConflict(corev1.Resource("services"), vService.Name, fmt.Errorf("service %s already exists in namespace %s", vService.Name, vService.Namespace))
}
return nil, err
}
vService.Spec.ClusterIP = newService.Spec.ClusterIP
vService.Status = newService.Status
// now create the service in the virtual cluster
err = virtualClient.Create(req.Context(), vService)
if err != nil {
// try to cleanup the created physical service
klog.Infof("Error creating service in virtual cluster: %v", err)
_ = localClient.Delete(context.Background(), newService)
return nil, err
}
return vService, nil
}