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nodechanges.go
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nodechanges.go
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package filters
import (
"context"
"fmt"
"io/ioutil"
"net/http"
"time"
"github.com/loft-sh/vcluster/pkg/server/handler"
"github.com/loft-sh/vcluster/pkg/util/encoding"
requestpkg "github.com/loft-sh/vcluster/pkg/util/request"
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/apimachinery/pkg/util/wait"
"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
"k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/client-go/rest"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
)
func WithNodeChanges(h http.Handler, localManager ctrl.Manager, virtualManager ctrl.Manager) 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
}
if info.APIVersion == corev1.SchemeGroupVersion.Version && info.APIGroup == corev1.SchemeGroupVersion.Group && info.Resource == "nodes" {
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 {
// 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 {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
updatedNode, err := updateNode(decoder, uncachedLocalClient, uncachedVirtualClient, rawObj, info.Subresource == "status")
if err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
responsewriters.WriteObjectNegotiated(s, negotiation.DefaultEndpointRestrictions, corev1.SchemeGroupVersion, w, req, http.StatusOK, updatedNode)
return
}
} else if info.Verb == "patch" {
options := &metav1.PatchOptions{}
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 {
patchNode(w, req, s, decoder, uncachedLocalClient, uncachedVirtualClient, virtualManager.GetConfig(), info.Subresource == "status")
return
}
}
}
h.ServeHTTP(w, req)
})
}
func patchNode(w http.ResponseWriter, req *http.Request, s runtime.NegotiatedSerializer, decoder encoding.Decoder, localClient client.Client, virtualClient client.Client, virtualConfig *rest.Config, status bool) {
h, err := handler.Handler("", virtualConfig, nil)
if err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
// make sure its a dry run
q := req.URL.Query()
q.Add("dryRun", "All")
req.URL.RawQuery = q.Encode()
code, header, data, err := executeRequest(req, h)
if err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
} else if code != http.StatusOK {
writeWithHeader(w, code, header, data)
return
}
vObj, err := updateNode(decoder, localClient, virtualClient, data, status)
if err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
responsewriters.WriteObjectNegotiated(s, negotiation.DefaultEndpointRestrictions, corev1.SchemeGroupVersion, w, req, http.StatusOK, vObj)
return
}
func updateNode(decoder encoding.Decoder, localClient client.Client, virtualClient client.Client, rawObj []byte, status bool) (runtime.Object, error) {
// make sure this gets done
ctx := context.Background()
nodeGVK := corev1.SchemeGroupVersion.WithKind("Node")
vObj, err := decoder.Decode(rawObj, &nodeGVK)
if err != nil {
return nil, err
}
vNode, ok := vObj.(*corev1.Node)
if !ok {
return nil, fmt.Errorf("expected node object")
}
// get the current virtual node
curVNode := &corev1.Node{}
err = virtualClient.Get(ctx, client.ObjectKey{Name: vNode.Name}, curVNode)
if err != nil {
return nil, err
} else if curVNode.ResourceVersion != vNode.ResourceVersion {
return nil, kerrors.NewConflict(corev1.Resource("nodes"), vNode.Name, fmt.Errorf("the object has been modified; please apply your changes to the latest version and try again"))
}
// get the corresponding physical node
pNode := &corev1.Node{}
err = localClient.Get(ctx, client.ObjectKey{Name: vNode.Name}, pNode)
if err != nil {
if kerrors.IsNotFound(err) {
return nil, kerrors.NewNotFound(corev1.Resource("nodes"), vNode.Name)
}
return nil, err
}
// apply the changes to from the vNode
newNode := pNode.DeepCopy()
newNode.Labels = vNode.Labels
newNode.Spec.Taints = vNode.Spec.Taints
newNode.Status.Capacity = vNode.Status.Capacity
// if there are no changes, just return the provided object
patch := client.MergeFrom(pNode)
data, err := patch.Data(newNode)
if err != nil || string(data) == "{}" {
return vNode, nil
}
// patch the physical node
if status {
err = localClient.Status().Patch(ctx, newNode, patch)
} else {
err = localClient.Patch(ctx, newNode, patch)
}
if err != nil {
return nil, err
} else if newNode.ResourceVersion == pNode.ResourceVersion {
return vNode, nil
}
// now let's wait for the virtual node to update
err = wait.PollImmediate(time.Second*4, time.Millisecond*200, func() (bool, error) {
updatedNode := &corev1.Node{}
err := virtualClient.Get(ctx, client.ObjectKey{Name: vNode.Name}, updatedNode)
if err != nil {
return false, nil
} else if updatedNode.ResourceVersion == vNode.ResourceVersion {
return false, nil
}
vNode = updatedNode
return true, nil
})
return vNode, err
}