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112 lines
2.4 KiB
112 lines
2.4 KiB
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kube
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import (
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"bytes"
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"fmt"
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"net"
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"strconv"
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"k8s.io/kubernetes/pkg/client/unversioned/portforward"
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"k8s.io/kubernetes/pkg/client/unversioned/remotecommand"
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)
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// Tunnel describes a ssh-like tunnel to a kubernetes pod
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type Tunnel struct {
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Local int
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Remote int
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stopChan chan struct{}
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}
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// Close disconnects a tunnel connection
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func (t *Tunnel) Close() {
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close(t.stopChan)
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}
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// ForwardPort opens a tunnel to a kubernetes pod
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func (c *Client) ForwardPort(namespace, podName string, remote int) (*Tunnel, error) {
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client, err := c.Client()
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if err != nil {
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return nil, err
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}
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config, err := c.ClientConfig()
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if err != nil {
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return nil, err
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}
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// Build a url to the portforward endpoing
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// example: http://localhost:8080/api/v1/namespaces/helm/pods/tiller-rc-9itlq/portforward
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u := client.RESTClient.Post().
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Resource("pods").
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Namespace(namespace).
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Name(podName).
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SubResource("portforward").URL()
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dialer, err := remotecommand.NewExecutor(config, "POST", u)
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if err != nil {
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return nil, err
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}
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local, err := getAvailablePort()
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if err != nil {
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return nil, err
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}
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t := &Tunnel{
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Local: local,
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Remote: remote,
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stopChan: make(chan struct{}, 1),
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}
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ports := []string{fmt.Sprintf("%d:%d", local, remote)}
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var b bytes.Buffer
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pf, err := portforward.New(dialer, ports, t.stopChan, &b, &b)
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if err != nil {
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return nil, err
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}
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errChan := make(chan error)
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go func() {
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errChan <- pf.ForwardPorts()
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}()
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select {
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case err = <-errChan:
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return t, fmt.Errorf("Error forwarding ports: %v\n", err)
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case <-pf.Ready:
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return t, nil
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}
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}
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func getAvailablePort() (int, error) {
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l, err := net.Listen("tcp", ":0")
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if err != nil {
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return 0, err
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}
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defer l.Close()
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_, p, err := net.SplitHostPort(l.Addr().String())
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port, err := strconv.Atoi(p)
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if err != nil {
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return 0, err
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}
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return port, err
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}
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