github.com/sdbaiguanghe/helm@v2.16.7+incompatible/pkg/helm/portforwarder/portforwarder.go (about)

     1  /*
     2  Copyright The Helm Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package portforwarder
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"k8s.io/api/core/v1"
    23  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    24  	"k8s.io/apimachinery/pkg/labels"
    25  	"k8s.io/client-go/kubernetes"
    26  	corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
    27  	"k8s.io/client-go/rest"
    28  
    29  	"k8s.io/helm/pkg/kube"
    30  	"k8s.io/helm/pkg/tiller/environment"
    31  )
    32  
    33  var (
    34  	tillerPodLabels = labels.Set{"app": "helm", "name": "tiller"}
    35  )
    36  
    37  // New creates a new and initialized tunnel.
    38  func New(namespace string, client kubernetes.Interface, config *rest.Config) (*kube.Tunnel, error) {
    39  	podName, err := GetTillerPodName(client.CoreV1(), namespace)
    40  	if err != nil {
    41  		return nil, err
    42  	}
    43  	t := kube.NewTunnel(client.CoreV1().RESTClient(), config, namespace, podName, environment.DefaultTillerPort)
    44  	return t, t.ForwardPort()
    45  }
    46  
    47  // GetTillerPodName fetches the name of tiller pod running in the given namespace.
    48  func GetTillerPodName(client corev1.PodsGetter, namespace string) (string, error) {
    49  	selector := tillerPodLabels.AsSelector()
    50  	pod, err := getFirstRunningPod(client, namespace, selector)
    51  	if err != nil {
    52  		return "", err
    53  	}
    54  	return pod.ObjectMeta.GetName(), nil
    55  }
    56  
    57  // GetTillerPodImage fetches the image of tiller pod running in the given namespace.
    58  func GetTillerPodImage(client corev1.PodsGetter, namespace string) (string, error) {
    59  	selector := tillerPodLabels.AsSelector()
    60  	pod, err := getFirstRunningPod(client, namespace, selector)
    61  	if err != nil {
    62  		return "", err
    63  	}
    64  	for _, c := range pod.Spec.Containers {
    65  		if c.Name == "tiller" {
    66  			return c.Image, nil
    67  		}
    68  	}
    69  	return "", fmt.Errorf("could not find a tiller pod")
    70  }
    71  
    72  func getFirstRunningPod(client corev1.PodsGetter, namespace string, selector labels.Selector) (*v1.Pod, error) {
    73  	options := metav1.ListOptions{LabelSelector: selector.String()}
    74  	pods, err := client.Pods(namespace).List(options)
    75  	if err != nil {
    76  		return nil, err
    77  	}
    78  	if len(pods.Items) < 1 {
    79  		return nil, fmt.Errorf("could not find tiller")
    80  	}
    81  	for _, p := range pods.Items {
    82  		if isPodReady(&p) {
    83  			return &p, nil
    84  		}
    85  	}
    86  	return nil, fmt.Errorf("could not find a ready tiller pod")
    87  }