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main.go
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main.go
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/*
Copyright 2021 KubeCube Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"context"
"flag"
"fmt"
consolelog "kubecube-webconsole/clog"
"net/http"
"os"
"time"
"github.com/kubecube-io/kubecube/pkg/clients"
"github.com/kubecube-io/kubecube/pkg/clog"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/leaderelection"
"k8s.io/client-go/tools/leaderelection/resourcelock"
_ "net/http/pprof"
ctrl "sigs.k8s.io/controller-runtime"
"kubecube-webconsole/handler"
)
// leader flag
var leader = false
func init() {
flag.Parse()
clients.InitCubeClientSetWithOpts(nil)
clog.InitCubeLoggerWithOpts(consolelog.NewLogConfig())
}
func main() {
// hostname is the key to select the master, so it must be terminated if it fails
hostname, err := os.Hostname()
if err != nil {
clog.Fatal("failed to get hostname: %v", err)
}
client, err := kubernetes.NewForConfig(ctrl.GetConfigOrDie())
if err != nil {
clog.Error("problem new raw k8s clientSet: %v", err)
return
}
runAPIServer()
rl, err := resourcelock.New(resourcelock.ConfigMapsResourceLock,
handler.LeaderElectionNamespace,
handler.LeaderElectionKey,
client.CoreV1(), nil,
resourcelock.ResourceLockConfig{
Identity: hostname,
})
if err != nil {
clog.Error("error creating lock: %v", err)
}
le, err := leaderelection.NewLeaderElector(leaderelection.LeaderElectionConfig{
Lock: rl,
LeaseDuration: 15 * time.Second,
RenewDeadline: 10 * time.Second,
RetryPeriod: 2 * time.Second,
Callbacks: leaderelection.LeaderCallbacks{
OnStartedLeading: func(ctx context.Context) {
leader = true
},
OnStoppedLeading: func() {
leader = false
clog.Info("leader election lost")
},
},
})
if err != nil {
clog.Error("leader election fail, be member")
}
le.Run(context.Background())
}
func runAPIServer() {
// provide api for livenessProbe
http.HandleFunc("/healthz", func(response http.ResponseWriter, request *http.Request) {
clog.Debug("Health check")
response.WriteHeader(http.StatusOK)
})
http.Handle("/api/", handler.CreateHTTPAPIHandler())
http.Handle("/api/sockjs/", handler.CreateAttachHandler("/api/sockjs"))
// provide api for readinessProbe,avoid service flow into in-leader pod
http.HandleFunc("/leader", func(response http.ResponseWriter, request *http.Request) {
statusCode := http.StatusOK
if !leader {
statusCode = http.StatusBadRequest
}
response.WriteHeader(statusCode)
})
go func() {
err := http.ListenAndServe(fmt.Sprintf(":%d", *handler.ServerPort), nil)
if err != nil {
clog.Fatal("ListenAndServe failed,error msg: %s", err.Error())
}
}()
}