mirror of https://github.com/helm/helm
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
122 lines
2.7 KiB
122 lines
2.7 KiB
/*
|
|
Copyright 2016 The Kubernetes Authors All rights reserved.
|
|
|
|
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
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"net"
|
|
"strconv"
|
|
|
|
"k8s.io/client-go/rest"
|
|
"k8s.io/client-go/tools/portforward"
|
|
"k8s.io/kubernetes/pkg/client/unversioned/remotecommand"
|
|
)
|
|
|
|
// Tunnel describes a ssh-like tunnel to a kubernetes pod
|
|
type Tunnel struct {
|
|
Local int
|
|
Remote int
|
|
Namespace string
|
|
PodName string
|
|
Out io.Writer
|
|
stopChan chan struct{}
|
|
readyChan chan struct{}
|
|
config *rest.Config
|
|
client rest.Interface
|
|
}
|
|
|
|
// NewTunnel creates a new tunnel
|
|
func NewTunnel(client rest.Interface, config *rest.Config, namespace, podName string, remote int) *Tunnel {
|
|
return &Tunnel{
|
|
config: config,
|
|
client: client,
|
|
Namespace: namespace,
|
|
PodName: podName,
|
|
Remote: remote,
|
|
stopChan: make(chan struct{}, 1),
|
|
readyChan: make(chan struct{}, 1),
|
|
Out: ioutil.Discard,
|
|
}
|
|
}
|
|
|
|
// Close disconnects a tunnel connection
|
|
func (t *Tunnel) Close() {
|
|
close(t.stopChan)
|
|
close(t.readyChan)
|
|
}
|
|
|
|
// ForwardPort opens a tunnel to a kubernetes pod
|
|
func (t *Tunnel) ForwardPort() error {
|
|
// Build a url to the portforward endpoint
|
|
// example: http://localhost:8080/api/v1/namespaces/helm/pods/tiller-deploy-9itlq/portforward
|
|
u := t.client.Post().
|
|
Resource("pods").
|
|
Namespace(t.Namespace).
|
|
Name(t.PodName).
|
|
SubResource("portforward").URL()
|
|
|
|
dialer, err := remotecommand.NewExecutor(t.config, "POST", u)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
local, err := getAvailablePort()
|
|
if err != nil {
|
|
return fmt.Errorf("could not find an available port: %s", err)
|
|
}
|
|
t.Local = local
|
|
|
|
ports := []string{fmt.Sprintf("%d:%d", t.Local, t.Remote)}
|
|
|
|
pf, err := portforward.New(dialer, ports, t.stopChan, t.readyChan, t.Out, t.Out)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
errChan := make(chan error)
|
|
go func() {
|
|
errChan <- pf.ForwardPorts()
|
|
}()
|
|
|
|
select {
|
|
case err = <-errChan:
|
|
return fmt.Errorf("forwarding ports: %v", err)
|
|
case <-pf.Ready:
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func getAvailablePort() (int, error) {
|
|
l, err := net.Listen("tcp", ":0")
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
defer l.Close()
|
|
|
|
_, p, err := net.SplitHostPort(l.Addr().String())
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
port, err := strconv.Atoi(p)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return port, err
|
|
}
|