github.com/inspektor-gadget/inspektor-gadget@v0.28.1/pkg/k8sutil/client.go (about)

     1  // Copyright 2019-2021 The Inspektor Gadget authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package k8sutil
    16  
    17  import (
    18  	"errors"
    19  	"path/filepath"
    20  
    21  	"k8s.io/cli-runtime/pkg/genericclioptions"
    22  	"k8s.io/client-go/kubernetes"
    23  	_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
    24  	"k8s.io/client-go/rest"
    25  	"k8s.io/client-go/tools/clientcmd"
    26  	"k8s.io/client-go/util/homedir"
    27  )
    28  
    29  func NewKubeConfig(kubeconfigPath string) (*rest.Config, error) {
    30  	var config *rest.Config
    31  	var err error
    32  	if kubeconfigPath != "" {
    33  		// kubeconfig is set explicitly (-kubeconfig flag or $KUBECONFIG variable)
    34  		config, err = clientcmd.BuildConfigFromFlags("", kubeconfigPath)
    35  	} else {
    36  		// kubeconfig from a pod Service Account token
    37  		config, err = rest.InClusterConfig()
    38  		if errors.Is(err, rest.ErrNotInCluster) {
    39  			// kubeconfig from $HOME/.kube/config
    40  			if home := homedir.HomeDir(); home != "" {
    41  				config, err = clientcmd.BuildConfigFromFlags("", filepath.Join(home, ".kube", "config"))
    42  			}
    43  		}
    44  	}
    45  	return config, err
    46  }
    47  
    48  func NewClientset(kubeconfigPath string) (*kubernetes.Clientset, error) {
    49  	config, err := NewKubeConfig(kubeconfigPath)
    50  	if err != nil {
    51  		return nil, err
    52  	}
    53  
    54  	apiclientset, err := kubernetes.NewForConfig(config)
    55  	if err != nil {
    56  		return nil, err
    57  	}
    58  
    59  	return apiclientset, nil
    60  }
    61  
    62  func NewClientsetFromConfigFlags(flags *genericclioptions.ConfigFlags) (*kubernetes.Clientset, error) {
    63  	config, err := flags.ToRESTConfig()
    64  	if err != nil {
    65  		return nil, err
    66  	}
    67  
    68  	client, err := kubernetes.NewForConfig(config)
    69  	if err != nil {
    70  		return nil, err
    71  	}
    72  
    73  	return client, nil
    74  }