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k8sutils.go
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k8sutils.go
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// Copyright © 2020-2022 Dell Inc. or its subsidiaries. All Rights Reserved.
//
// 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 k8sutils
import (
"context"
"fmt"
"os"
"github.com/kubernetes-csi/csi-lib-utils/leaderelection"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
)
// Clientset - Interface to kubernetes
var Clientset kubernetes.Interface
type leaderElection interface {
Run() error
WithNamespace(namespace string)
}
// CreateKubeClientSet - Returns kubeclient set
func CreateKubeClientSet() error {
config, err := rest.InClusterConfig()
if err != nil {
return err
}
// creates the clientset
Clientset, err = kubernetes.NewForConfig(config)
if err != nil {
return err
}
return nil
}
// LeaderElection - Initializes Leader election
func LeaderElection(clientset *kubernetes.Interface, lockName string, namespace string, runFunc func(ctx context.Context)) {
le := leaderelection.NewLeaderElection(*clientset, lockName, runFunc)
le.WithNamespace(namespace)
if err := le.Run(); err != nil {
_, _ = fmt.Fprintf(os.Stderr, "failed to initialize leader election: %v", err)
os.Exit(1)
}
}