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election.go
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election.go
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package controller
import (
"context"
"os"
"time"
apiv1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/tools/leaderelection"
"k8s.io/client-go/tools/leaderelection/resourcelock"
"k8s.io/client-go/tools/record"
"k8s.io/klog/v2"
)
const ovnLeaderElector = "ovn-controller-leader-elector"
type leaderElectionConfig struct {
PodName string
PodNamespace string
Client clientset.Interface
ElectionID string
OnStartedLeading func(chan struct{})
OnStoppedLeading func()
OnNewLeader func(identity string)
}
func (c *Controller) isLeader() bool {
return c.elector.IsLeader()
}
func (c *Controller) leaderElection() {
elector := setupLeaderElection(&leaderElectionConfig{
Client: c.config.KubeClient,
ElectionID: "ovn-config",
PodName: c.config.PodName,
PodNamespace: c.config.PodNamespace,
})
c.elector = elector
for {
if c.isLeader() {
return
}
klog.Info("waiting for becoming a leader")
time.Sleep(5 * time.Second)
}
}
func setupLeaderElection(config *leaderElectionConfig) *leaderelection.LeaderElector {
var stopCh chan struct{}
callbacks := leaderelection.LeaderCallbacks{
OnStartedLeading: func(ctx context.Context) {
klog.Infof("I am the new leader")
stopCh = make(chan struct{})
if config.OnStartedLeading != nil {
config.OnStartedLeading(stopCh)
}
},
OnStoppedLeading: func() {
klog.Info("I am not leader anymore")
close(stopCh)
if config.OnStoppedLeading != nil {
config.OnStoppedLeading()
}
klog.Fatalf("leaderelection lost")
},
OnNewLeader: func(identity string) {
klog.Infof("new leader elected: %v", identity)
if config.OnNewLeader != nil {
config.OnNewLeader(identity)
}
},
}
broadcaster := record.NewBroadcaster()
hostname := os.Getenv("KUBE_NODE_NAME")
recorder := broadcaster.NewRecorder(scheme.Scheme, apiv1.EventSource{
Component: ovnLeaderElector,
Host: hostname,
})
lock := resourcelock.ConfigMapLock{
ConfigMapMeta: metav1.ObjectMeta{Namespace: config.PodNamespace, Name: config.ElectionID},
Client: config.Client.CoreV1(),
LockConfig: resourcelock.ResourceLockConfig{
Identity: config.PodName,
EventRecorder: recorder,
},
}
elector, err := leaderelection.NewLeaderElector(leaderelection.LeaderElectionConfig{
Lock: &lock,
LeaseDuration: 15 * time.Second,
RenewDeadline: 10 * time.Second,
RetryPeriod: 2 * time.Second,
Callbacks: callbacks,
})
if err != nil {
klog.Fatalf("unexpected error starting leader election: %v", err)
}
go elector.Run(context.Background())
return elector
}