mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package inclusterclient
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import (
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"context"
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"crypto/sha256"
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"encoding/base64"
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"flag"
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"fmt"
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"log"
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"net/http"
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"time"
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"github.com/spf13/cobra"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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"k8s.io/component-base/logs"
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"k8s.io/klog/v2"
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)
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var pollInterval int
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// CmdInClusterClient is used by agnhost Cobra.
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var CmdInClusterClient = &cobra.Command{
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Use: "inclusterclient",
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Short: "Periodically poll the Kubernetes \"/healthz\" endpoint",
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Long: `Periodically polls the Kubernetes "/healthz" endpoint using the in-cluster config. Because of this, this subcommand is meant to be run inside of a Kubernetes pod.
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This subcommand can also be used to validate token rotation.`,
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Args: cobra.MaximumNArgs(0),
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Run: main,
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}
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func init() {
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CmdInClusterClient.Flags().IntVar(&pollInterval, "poll-interval", 30,
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"poll interval of call to /healthz in seconds")
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}
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func main(cmd *cobra.Command, args []string) {
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logs.InitLogs()
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defer logs.FlushLogs()
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flag.Set("logtostderr", "true")
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klog.Infof("started")
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cfg, err := rest.InClusterConfig()
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if err != nil {
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log.Fatalf("err: %v", err)
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}
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cfg.Wrap(func(rt http.RoundTripper) http.RoundTripper {
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return &debugRt{
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rt: rt,
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}
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})
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c := kubernetes.NewForConfigOrDie(cfg).RESTClient()
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//lint:ignore SA1015 noisy positive, `time.Tick` is used in a main function which is fine
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t := time.Tick(time.Duration(pollInterval) * time.Second)
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for {
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<-t
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klog.Infof("calling /healthz")
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b, err := c.Get().AbsPath("/healthz").Do(context.TODO()).Raw()
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if err != nil {
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klog.Errorf("status=failed")
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klog.Errorf("error checking /healthz: %v\n%s\n", err, string(b))
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}
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}
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}
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type debugRt struct {
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rt http.RoundTripper
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}
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func (rt *debugRt) RoundTrip(req *http.Request) (*http.Response, error) {
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authHeader := req.Header.Get("Authorization")
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if len(authHeader) != 0 {
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authHash := sha256.Sum256([]byte(fmt.Sprintf("%s|%s", "salt", authHeader)))
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klog.Infof("authz_header=%s", base64.RawURLEncoding.EncodeToString(authHash[:]))
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} else {
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klog.Errorf("authz_header=<empty>")
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}
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return rt.rt.RoundTrip(req)
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}
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func (rt *debugRt) WrappedRoundTripper() http.RoundTripper { return rt.rt }
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