github.com/jonaz/heapster@v1.3.0-beta.0.0.20170208112634-cd3c15ca3d29/common/kubernetes/configs.go (about)

     1  // Copyright 2014 Google Inc. All Rights Reserved.
     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 kubernetes
    16  
    17  import (
    18  	"fmt"
    19  	"io/ioutil"
    20  	"net/url"
    21  	"strconv"
    22  
    23  	"k8s.io/kubernetes/pkg/api/unversioned"
    24  	kube_client "k8s.io/kubernetes/pkg/client/restclient"
    25  	kubeClientCmd "k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
    26  	kubeClientCmdApi "k8s.io/kubernetes/pkg/client/unversioned/clientcmd/api"
    27  )
    28  
    29  const (
    30  	APIVersion = "v1"
    31  
    32  	defaultKubeletPort        = 10255
    33  	defaultKubeletHttps       = false
    34  	defaultUseServiceAccount  = false
    35  	defaultServiceAccountFile = "/var/run/secrets/kubernetes.io/serviceaccount/token"
    36  	defaultInClusterConfig    = true
    37  )
    38  
    39  func getConfigOverrides(uri *url.URL) (*kubeClientCmd.ConfigOverrides, error) {
    40  	kubeConfigOverride := kubeClientCmd.ConfigOverrides{
    41  		ClusterInfo: kubeClientCmdApi.Cluster{
    42  			APIVersion: APIVersion,
    43  		},
    44  	}
    45  	if len(uri.Scheme) != 0 && len(uri.Host) != 0 {
    46  		kubeConfigOverride.ClusterInfo.Server = fmt.Sprintf("%s://%s", uri.Scheme, uri.Host)
    47  	}
    48  
    49  	opts := uri.Query()
    50  
    51  	if len(opts["apiVersion"]) >= 1 {
    52  		kubeConfigOverride.ClusterInfo.APIVersion = opts["apiVersion"][0]
    53  	}
    54  
    55  	if len(opts["insecure"]) > 0 {
    56  		insecure, err := strconv.ParseBool(opts["insecure"][0])
    57  		if err != nil {
    58  			return nil, err
    59  		}
    60  		kubeConfigOverride.ClusterInfo.InsecureSkipTLSVerify = insecure
    61  	}
    62  
    63  	return &kubeConfigOverride, nil
    64  }
    65  
    66  func GetKubeClientConfig(uri *url.URL) (*kube_client.Config, error) {
    67  	var (
    68  		kubeConfig *kube_client.Config
    69  		err        error
    70  	)
    71  
    72  	opts := uri.Query()
    73  	configOverrides, err := getConfigOverrides(uri)
    74  	if err != nil {
    75  		return nil, err
    76  	}
    77  
    78  	inClusterConfig := defaultInClusterConfig
    79  	if len(opts["inClusterConfig"]) > 0 {
    80  		inClusterConfig, err = strconv.ParseBool(opts["inClusterConfig"][0])
    81  		if err != nil {
    82  			return nil, err
    83  		}
    84  	}
    85  
    86  	if inClusterConfig {
    87  		kubeConfig, err = kube_client.InClusterConfig()
    88  		if err != nil {
    89  			return nil, err
    90  		}
    91  
    92  		if configOverrides.ClusterInfo.Server != "" {
    93  			kubeConfig.Host = configOverrides.ClusterInfo.Server
    94  		}
    95  		kubeConfig.GroupVersion = &unversioned.GroupVersion{Version: configOverrides.ClusterInfo.APIVersion}
    96  		kubeConfig.Insecure = configOverrides.ClusterInfo.InsecureSkipTLSVerify
    97  		if configOverrides.ClusterInfo.InsecureSkipTLSVerify {
    98  			kubeConfig.TLSClientConfig.CAFile = ""
    99  		}
   100  	} else {
   101  		authFile := ""
   102  		if len(opts["auth"]) > 0 {
   103  			authFile = opts["auth"][0]
   104  		}
   105  
   106  		if authFile != "" {
   107  			// Load structured kubeconfig data from the given path.
   108  			loader := &kubeClientCmd.ClientConfigLoadingRules{ExplicitPath: authFile}
   109  			loadedConfig, err := loader.Load()
   110  			if err != nil {
   111  				return nil, err
   112  			}
   113  
   114  			// Flatten the loaded data to a particular restclient.Config based on the current context.
   115  			if kubeConfig, err = kubeClientCmd.NewNonInteractiveClientConfig(
   116  				*loadedConfig,
   117  				loadedConfig.CurrentContext,
   118  				&kubeClientCmd.ConfigOverrides{},
   119  				loader).ClientConfig(); err != nil {
   120  				return nil, err
   121  			}
   122  		} else {
   123  			kubeConfig = &kube_client.Config{
   124  				Host:     configOverrides.ClusterInfo.Server,
   125  				Insecure: configOverrides.ClusterInfo.InsecureSkipTLSVerify,
   126  			}
   127  			kubeConfig.GroupVersion = &unversioned.GroupVersion{Version: configOverrides.ClusterInfo.APIVersion}
   128  		}
   129  	}
   130  	if len(kubeConfig.Host) == 0 {
   131  		return nil, fmt.Errorf("invalid kubernetes master url specified")
   132  	}
   133  
   134  	useServiceAccount := defaultUseServiceAccount
   135  	if len(opts["useServiceAccount"]) >= 1 {
   136  		useServiceAccount, err = strconv.ParseBool(opts["useServiceAccount"][0])
   137  		if err != nil {
   138  			return nil, err
   139  		}
   140  	}
   141  
   142  	if useServiceAccount {
   143  		// If a readable service account token exists, then use it
   144  		if contents, err := ioutil.ReadFile(defaultServiceAccountFile); err == nil {
   145  			kubeConfig.BearerToken = string(contents)
   146  		}
   147  	}
   148  
   149  	kubeConfig.ContentType = "application/vnd.kubernetes.protobuf"
   150  
   151  	return kubeConfig, nil
   152  }