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/*
Copyright 2024 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 leases
import (
"context"
"time"
coordinationv1 "k8s.io/api/coordination/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/client-go/kubernetes"
"k8s.io/component-helpers/apimachinery/lease"
"k8s.io/klog/v2"
"k8s.io/utils/clock"
)
type Controller struct {
leaseName string
leaseNamespace string
k8sClient kubernetes.Interface
gcController *GarbageCollectionController
acquireController lease.Controller
}
func NewController(k8sClient kubernetes.Interface, holderIdentity string, leaseDurationSeconds int32, renewInterval time.Duration, gcCheckPeriod time.Duration, leaseName, leaseNamespace string, leaseLabels map[string]string) *Controller {
acquireController := lease.NewController(
clock.RealClock{},
k8sClient,
holderIdentity,
leaseDurationSeconds,
nil,
renewInterval,
leaseName,
leaseNamespace,
func(lease *coordinationv1.Lease) error {
lease.SetLabels(leaseLabels)
return nil
},
)
gcController := NewGarbageCollectionController(clock.RealClock{}, k8sClient, leaseNamespace, gcCheckPeriod, labels.FormatLabels(leaseLabels))
return &Controller{
leaseNamespace: leaseNamespace,
leaseName: leaseName,
k8sClient: k8sClient,
gcController: gcController,
acquireController: acquireController,
}
}
// Run starts the garbage collection and lease acquisition controllers. Non-blocking.
func (c *Controller) Run(ctx context.Context) {
go c.gcController.Run(ctx)
go c.acquireController.Run(ctx)
}
func (c *Controller) Stop() {
klog.Infof("Cleaning up server lease %q", c.leaseName)
err := c.k8sClient.CoordinationV1().Leases(c.leaseNamespace).Delete(context.Background(), c.leaseName, metav1.DeleteOptions{})
if err != nil {
klog.Errorf("Could not clean up lease %q in namespace %q", c.leaseName, c.leaseNamespace)
}
}
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