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client.go
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client.go
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// Copyright 2017 Istio 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 kube implements the shared and reusable library for Kubernetes
package kube
import (
"fmt"
"os"
"os/user"
multierror "github.com/hashicorp/go-multierror"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
"istio.io/istio/pkg/log"
// import GKE cluster authentication plugin
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
// import OIDC cluster authentication plugin, e.g. for Tectonic
_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
)
// ResolveConfig checks whether to use the in-cluster or out-of-cluster config
func ResolveConfig(kubeconfig string) (string, error) {
// Consistency with kubectl
if kubeconfig == "" {
kubeconfig = os.Getenv("KUBECONFIG")
}
if kubeconfig == "" {
usr, err := user.Current()
if err == nil {
defaultCfg := usr.HomeDir + "/.kube/config"
_, err := os.Stat(kubeconfig)
if err != nil {
kubeconfig = defaultCfg
}
}
}
if kubeconfig != "" {
info, err := os.Stat(kubeconfig)
if err != nil {
if os.IsNotExist(err) {
err = fmt.Errorf("kubernetes configuration file %q does not exist", kubeconfig)
} else {
err = multierror.Append(err, fmt.Errorf("kubernetes configuration file %q", kubeconfig))
}
return "", err
}
// if it's an empty file, switch to in-cluster config
if info.Size() == 0 {
log.Info("using in-cluster configuration")
return "", nil
}
}
return kubeconfig, nil
}
// CreateInterface is a helper function to create Kubernetes interface from kubeconfig file
func CreateInterface(kubeconfig string) (kubernetes.Interface, error) {
restConfig, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, err
}
return kubernetes.NewForConfig(restConfig)
}
// CreateInterfaceFromClusterConfig is a helper function to create Kubernetes interface from in memory cluster config struct
func CreateInterfaceFromClusterConfig(clusterConfig *clientcmdapi.Config) (kubernetes.Interface, error) {
return createInterface(clusterConfig)
}
// createInterface is new function which creates rest config and kubernetes interface
// from passed cluster's config struct
func createInterface(clusterConfig *clientcmdapi.Config) (kubernetes.Interface, error) {
clientConfig := clientcmd.NewDefaultClientConfig(*clusterConfig, &clientcmd.ConfigOverrides{})
rest, err := clientConfig.ClientConfig()
if err != nil {
return nil, err
}
return kubernetes.NewForConfig(rest)
}