kubernetes.go

/*
 Copyright 2021 zhangwei24@apache.org

 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 k8s

import (
	"strings"

	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/rest"
	"k8s.io/client-go/tools/clientcmd"
)

type Client interface {
	Kubernetes() kubernetes.Interface
	Config() *rest.Config
}

type kubernetesClient struct {
	// kubernetes client interface
	k8s kubernetes.Interface

	master string

	config *rest.Config
}

// NewKubernetesClient creates kubernetesClient and panic if there is an error
func NewKubernetesClientOrDie(options *KubernetesOptions) Client {
	config, err := clientcmd.BuildConfigFromFlags("", options.KubeConfig)
	if err != nil {
		panic(err)
	}

	config.QPS = options.QPS
	config.Burst = options.Burst

	k := &kubernetesClient{
		k8s:    kubernetes.NewForConfigOrDie(config),
		master: config.Host,
		config: config,
	}

	if options.Master != "" {
		k.master = options.Master
	}

	// The https prefix is automatically added when using sa.
	// But it will not be set automatically when reading from kubeconfig
	// which may cause some problems in the client of other languages.
	if !strings.HasPrefix(k.master, "http://") && !strings.HasPrefix(k.master, "https://") {
		k.master = "https://" + k.master
	}
	return k
}

// NewKubernetesClient creates a kubernetesClient
func NewKubernetesClient(options *KubernetesOptions) (Client, error) {
	config, err := clientcmd.BuildConfigFromFlags("", options.KubeConfig)
	if err != nil {
		return nil, err
	}

	config.QPS = options.QPS
	config.Burst = options.Burst

	var k kubernetesClient
	k.k8s, err = kubernetes.NewForConfig(config)
	if err != nil {
		return nil, err
	}

	k.master = options.Master
	k.config = config
	return &k, nil
}

func (k *kubernetesClient) Kubernetes() kubernetes.Interface {
	return k.k8s
}

func (k *kubernetesClient) Config() *rest.Config {
	return k.config
}