mirror of https://github.com/k3s-io/k3s
68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
package leader
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import (
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"context"
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"os"
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"time"
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"github.com/sirupsen/logrus"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/tools/leaderelection"
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"k8s.io/client-go/tools/leaderelection/resourcelock"
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)
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type Callback func(cb context.Context)
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func RunOrDie(ctx context.Context, namespace, name string, client kubernetes.Interface, cb Callback) {
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if namespace == "" {
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namespace = "kube-system"
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}
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err := run(ctx, namespace, name, client, cb)
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if err != nil {
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logrus.Fatalf("Failed to start leader election for %s", name)
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}
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panic("Failed to start leader election for " + name)
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}
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func run(ctx context.Context, namespace, name string, client kubernetes.Interface, cb Callback) error {
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id, err := os.Hostname()
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if err != nil {
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return err
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}
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rl, err := resourcelock.New(resourcelock.ConfigMapsResourceLock,
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namespace,
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name,
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client.CoreV1(),
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client.CoordinationV1(),
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resourcelock.ResourceLockConfig{
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Identity: id,
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})
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if err != nil {
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logrus.Fatalf("error creating leader lock for %s: %v", name, err)
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}
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t := time.Second
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if dl := os.Getenv("CATTLE_DEV_MODE"); dl != "" {
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t = time.Hour
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}
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leaderelection.RunOrDie(ctx, leaderelection.LeaderElectionConfig{
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Lock: rl,
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LeaseDuration: 45 * t,
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RenewDeadline: 30 * t,
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RetryPeriod: 2 * t,
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Callbacks: leaderelection.LeaderCallbacks{
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OnStartedLeading: func(ctx context.Context) {
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go cb(ctx)
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},
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OnStoppedLeading: func() {
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logrus.Fatalf("leaderelection lost for %s", name)
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},
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},
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ReleaseOnCancel: true,
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})
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panic("unreachable")
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}
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