/
status.go
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/
status.go
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/*
Copyright 2019 The Kubernetes 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 controller
import (
"context"
"os"
"time"
"k8s.io/ingress-nginx/internal/k8s"
"k8s.io/klog/v2"
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"
)
type leaderElectionConfig struct {
Client clientset.Interface
ElectionID string
ElectionTTL time.Duration
OnStartedLeading func(chan struct{})
OnStoppedLeading func()
}
func setupLeaderElection(config *leaderElectionConfig) {
var elector *leaderelection.LeaderElector
// start a new context
ctx := context.Background()
var cancelContext context.CancelFunc
newLeaderCtx := func(ctx context.Context) context.CancelFunc {
// allow to cancel the context in case we stop being the leader
leaderCtx, cancel := context.WithCancel(ctx)
go elector.Run(leaderCtx)
return cancel
}
var stopCh chan struct{}
callbacks := leaderelection.LeaderCallbacks{
OnStartedLeading: func(_ context.Context) {
klog.V(2).InfoS("I am the new leader")
stopCh = make(chan struct{})
if config.OnStartedLeading != nil {
config.OnStartedLeading(stopCh)
}
},
OnStoppedLeading: func() {
klog.V(2).InfoS("I am not leader anymore")
close(stopCh)
// cancel the context
cancelContext()
cancelContext = newLeaderCtx(ctx)
if config.OnStoppedLeading != nil {
config.OnStoppedLeading()
}
},
OnNewLeader: func(identity string) {
klog.InfoS("New leader elected", "identity", identity)
},
}
broadcaster := record.NewBroadcaster()
hostname, err := os.Hostname()
if err != nil {
klog.Errorf("unexpected error getting hostname: %v", err)
}
recorder := broadcaster.NewRecorder(scheme.Scheme, apiv1.EventSource{
Component: "ingress-leader-elector",
Host: hostname,
})
objectMeta := metav1.ObjectMeta{Namespace: k8s.IngressPodDetails.Namespace, Name: config.ElectionID}
resourceLockConfig := resourcelock.ResourceLockConfig{
Identity: k8s.IngressPodDetails.Name,
EventRecorder: recorder,
}
lock := &resourcelock.LeaseLock{
LeaseMeta: objectMeta,
Client: config.Client.CoordinationV1(),
LockConfig: resourceLockConfig,
}
elector, err = leaderelection.NewLeaderElector(leaderelection.LeaderElectionConfig{
Lock: lock,
LeaseDuration: config.ElectionTTL,
RenewDeadline: config.ElectionTTL / 2,
RetryPeriod: config.ElectionTTL / 4,
Callbacks: callbacks,
})
if err != nil {
klog.Fatalf("unexpected error starting leader election: %v", err)
}
cancelContext = newLeaderCtx(ctx)
}