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metrics.go
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/
metrics.go
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package filters
import (
"compress/gzip"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"net/http/httptest"
"strconv"
"strings"
"github.com/loft-sh/vcluster/pkg/constants"
"github.com/loft-sh/vcluster/pkg/metrics"
"github.com/loft-sh/vcluster/pkg/server/handler"
"github.com/loft-sh/vcluster/pkg/util/clienthelper"
requestpkg "github.com/loft-sh/vcluster/pkg/util/request"
"github.com/prometheus/common/expfmt"
corev1 "k8s.io/api/core/v1"
kerrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
"k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/client-go/rest"
statsv1alpha1 "k8s.io/kubelet/pkg/apis/stats/v1alpha1"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
KubectlCommandHeader = "Kubectl-Command"
)
func WithMetricsProxy(h http.Handler, localConfig *rest.Config, cachedVirtualClient client.Client) http.Handler {
s := serializer.NewCodecFactory(cachedVirtualClient.Scheme())
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 isNodesProxy(info) {
// rewrite node port if there is one
splitted := strings.Split(req.URL.Path, "/")
if len(splitted) < 5 {
responsewriters.ErrorNegotiated(kerrors.NewBadRequest("unexpected url"), s, corev1.SchemeGroupVersion, w, req)
return
}
// make sure we keep the prefix and suffix
targetNode := splitted[4]
splittedName := strings.Split(targetNode, ":")
if len(splittedName) == 2 || len(splittedName) == 3 {
port := splittedName[1]
if len(splittedName) == 3 {
port = splittedName[2]
}
// delete port if it is the default one
if port == strconv.Itoa(int(constants.KubeletPort)) {
if len(splittedName) == 2 {
targetNode = splittedName[0]
} else {
targetNode = splittedName[0] + ":" + splittedName[1] + ":"
}
}
}
// exchange node name
splitted[4] = targetNode
req.URL.Path = strings.Join(splitted, "/")
// execute the request
_, err := handleNodeRequest(localConfig, cachedVirtualClient, w, req)
if err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
return
}
h.ServeHTTP(w, req)
})
}
func writeWithHeader(w http.ResponseWriter, code int, header http.Header, body []byte) {
// delete old header
for k := range w.Header() {
w.Header().Del(k)
}
for k, v := range header {
for _, s := range v {
w.Header().Add(k, s)
}
}
w.WriteHeader(code)
_, _ = w.Write(body)
}
func rewritePrometheusMetrics(req *http.Request, data []byte, vClient client.Client) ([]byte, error) {
metricsFamilies, err := metrics.Decode(data)
if err != nil {
return nil, err
}
metricsFamilies, err = metrics.Rewrite(req.Context(), metricsFamilies, vClient)
if err != nil {
return nil, err
}
return metrics.Encode(metricsFamilies, expfmt.Negotiate(req.Header))
}
func handleNodeRequest(localConfig *rest.Config, vClient client.Client, w http.ResponseWriter, req *http.Request) (bool, error) {
// authorization was done here already so we will just go forward with the rewrite
req.Header.Del("Authorization")
h, err := handler.Handler("", localConfig, nil)
if err != nil {
return false, err
}
code, header, data, err := executeRequest(req, h)
if err != nil {
return false, err
} else if code != http.StatusOK {
writeWithHeader(w, code, header, data)
return false, nil
}
// now rewrite the metrics
newData := data
if IsKubeletMetrics(req.URL.Path) {
newData, err = rewritePrometheusMetrics(req, data, vClient)
if err != nil {
return false, err
}
} else if IsKubeletStats(req.URL.Path) {
newData, err = rewriteStats(req.Context(), data, vClient)
if err != nil {
return false, err
}
}
w.Header().Set("Content-Type", string(expfmt.Negotiate(req.Header)))
w.WriteHeader(code)
_, _ = w.Write(newData)
return true, nil
}
func rewriteStats(ctx context.Context, data []byte, vClient client.Client) ([]byte, error) {
stats := &statsv1alpha1.Summary{}
err := json.Unmarshal(data, stats)
if err != nil {
return nil, err
}
// rewrite pods
newPods := []statsv1alpha1.PodStats{}
for _, pod := range stats.Pods {
// search if we can find the pod by name in the virtual cluster
podList := &corev1.PodList{}
err := vClient.List(ctx, podList, client.MatchingFields{constants.IndexByPhysicalName: pod.PodRef.Namespace + "/" + pod.PodRef.Name})
if err != nil {
return nil, err
}
// skip the metric if the pod couldn't be found in the virtual cluster
if len(podList.Items) == 0 {
continue
}
vPod := podList.Items[0]
pod.PodRef.Name = vPod.Name
pod.PodRef.Namespace = vPod.Namespace
pod.PodRef.UID = string(vPod.UID)
newVolumes := []statsv1alpha1.VolumeStats{}
for _, volume := range pod.VolumeStats {
if volume.PVCRef != nil {
vPVC := &corev1.PersistentVolumeClaim{}
err = clienthelper.GetByIndex(ctx, vClient, vPVC, constants.IndexByPhysicalName, volume.PVCRef.Namespace+"/"+volume.PVCRef.Name)
if err != nil {
return nil, err
}
volume.PVCRef.Name = vPVC.Name
volume.PVCRef.Namespace = vPVC.Namespace
}
newVolumes = append(newVolumes, volume)
}
pod.VolumeStats = newVolumes
newPods = append(newPods, pod)
}
stats.Pods = newPods
out, err := json.MarshalIndent(stats, "", " ")
if err != nil {
return nil, err
}
return out, nil
}
func executeRequest(req *http.Request, h http.Handler) (int, http.Header, []byte, error) {
clonedRequest := req.Clone(req.Context())
fakeWriter := httptest.NewRecorder()
h.ServeHTTP(fakeWriter, clonedRequest)
// Check that the server actually sent compressed data
var responseBytes []byte
switch fakeWriter.Header().Get("Content-Encoding") {
case "gzip":
reader, err := gzip.NewReader(fakeWriter.Body)
if err != nil {
return 0, nil, nil, err
}
responseBytes, err = io.ReadAll(reader)
if err != nil {
return 0, nil, nil, err
}
fakeWriter.Header().Del("Content-Encoding")
default:
responseBytes = fakeWriter.Body.Bytes()
}
return fakeWriter.Code, fakeWriter.Header(), responseBytes, nil
}
func isNodesProxy(r *request.RequestInfo) bool {
if !r.IsResourceRequest {
return false
}
return r.APIGroup == corev1.SchemeGroupVersion.Group &&
r.APIVersion == corev1.SchemeGroupVersion.Version &&
r.Resource == "nodes" &&
r.Subresource == "proxy"
}
func IsKubeletStats(path string) bool {
return strings.HasSuffix(path, "/stats/summary")
}
func IsKubeletMetrics(path string) bool {
return strings.HasSuffix(path, "/metrics") || strings.HasSuffix(path, "/metrics/cadvisor") || strings.HasSuffix(path, "/metrics/probes") || strings.HasSuffix(path, "/metrics/resource") || strings.HasSuffix(path, "/metrics/resource/v1alpha1") || strings.HasSuffix(path, "/metrics/resource/v1beta1")
}