mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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100 lines
2.6 KiB
Go
100 lines
2.6 KiB
Go
/*
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Copyright 2024 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 leaderelection
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import (
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"context"
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"os"
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"time"
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"k8s.io/apimachinery/pkg/util/uuid"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/client-go/rest"
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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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"k8s.io/klog/v2"
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)
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var (
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// TODO: Eventually these should be configurable
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LeaseDuration = 15 * time.Second
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RenewDeadline = 10 * time.Second
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RetryPeriod = 2 * time.Second
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)
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type NewRunner func() (func(ctx context.Context, workers int), error)
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// RunWithLeaderElection runs the provided runner function with leader election.
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// newRunnerFn might be called multiple times, and it should return another
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// controller instance's Run method each time.
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// RunWithLeaderElection only returns when the context is done, or initial
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// leader election fails.
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func RunWithLeaderElection(ctx context.Context, config *rest.Config, newRunnerFn NewRunner) {
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hostname, err := os.Hostname()
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if err != nil {
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klog.Infof("Error parsing hostname: %v", err)
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return
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}
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identity := hostname + "_" + string(uuid.NewUUID())
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wait.Until(func() {
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callbacks := leaderelection.LeaderCallbacks{
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OnStartedLeading: func(ctx context.Context) {
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var err error
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run, err := newRunnerFn()
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if err != nil {
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klog.Infof("Error creating runner: %v", err)
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return
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}
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run(ctx, 1)
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},
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OnStoppedLeading: func() {
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},
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}
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rl, err := resourcelock.NewFromKubeconfig(
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"leases",
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"kube-system",
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controllerName,
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resourcelock.ResourceLockConfig{
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Identity: identity,
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},
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config,
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10,
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)
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if err != nil {
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klog.Infof("Error creating resourcelock: %v", err)
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return
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}
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le, err := leaderelection.NewLeaderElector(leaderelection.LeaderElectionConfig{
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Lock: rl,
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LeaseDuration: LeaseDuration,
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RenewDeadline: RenewDeadline,
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RetryPeriod: RetryPeriod,
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Callbacks: callbacks,
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Name: controllerName,
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ReleaseOnCancel: true,
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})
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if err != nil {
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klog.Infof("Error creating leader elector: %v", err)
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return
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}
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le.Run(ctx)
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}, RetryPeriod, ctx.Done())
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}
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