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terminal.go
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terminal.go
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package pod
import (
"crypto/md5"
"crypto/rand"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"strconv"
"time"
"github.com/Qihoo360/wayne/src/backend/client"
"github.com/Qihoo360/wayne/src/backend/util/hack"
"github.com/Qihoo360/wayne/src/backend/util/logs"
"github.com/astaxie/beego"
"gopkg.in/igm/sockjs-go.v2/sockjs"
"k8s.io/api/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/remotecommand"
)
type PtyHandler interface {
io.Reader
io.Writer
remotecommand.TerminalSizeQueue
}
type TerminalSession struct {
id string
sockJSSession sockjs.Session
sizeChan chan remotecommand.TerminalSize
}
type TerminalMessage struct {
Op, Data, SessionID string
Rows, Cols uint16
}
type TerminalResult struct {
SessionId string `json:"sessionId,omitempty"`
Token string `json:"token,omitempty"`
Cluster string `json:"cluster,omitempty"`
Namespace string `json:"namespace,omitempty"`
Pod string `json:"pod,omitempty"`
Container string `json:"container,omitempty"`
Cmd string `json:"cmd,omitempty"`
}
func (t TerminalSession) Next() *remotecommand.TerminalSize {
select {
case size := <-t.sizeChan:
return &size
}
return nil
}
func (t TerminalSession) Read(p []byte) (int, error) {
m, err := t.sockJSSession.Recv()
if err != nil {
return 0, err
}
var msg TerminalMessage
if err := json.Unmarshal([]byte(m), &msg); err != nil {
logs.Warning("read msg (%s) form client error.%v", string(p), err)
return 0, err
}
switch msg.Op {
case "stdin":
return copy(p, msg.Data), nil
case "resize":
t.sizeChan <- remotecommand.TerminalSize{msg.Cols, msg.Rows}
return 0, nil
default:
return 0, fmt.Errorf("unknown message type '%s'", msg.Op)
}
}
func (t TerminalSession) Write(p []byte) (int, error) {
msg, err := json.Marshal(TerminalMessage{
Op: "stdout",
Data: string(p),
})
if err != nil {
return 0, err
}
if err = t.sockJSSession.Send(string(msg)); err != nil {
return 0, err
}
return len(p), nil
}
func (t TerminalSession) Close(status uint32, reason string) {
t.sockJSSession.Close(status, reason)
logs.Info("close socket (%s). %d, %s ", t.id, status, reason)
}
// 处理客户端发来的ws建立请求
func handleTerminalSession(session sockjs.Session) {
var (
buf string
err error
msg TerminalMessage
)
if buf, err = session.Recv(); err != nil {
logs.Error("handleTerminalSession: can't Recv: %v", err)
return
}
if err = json.Unmarshal([]byte(buf), &msg); err != nil {
logs.Error("handleTerminalSession: can't UnMarshal (%v): %s", err, buf)
return
}
if msg.Op != "bind" {
logs.Error("handleTerminalSession: expected 'bind' message, got: %s", buf)
return
}
var tr TerminalResult
if err := json.Unmarshal(hack.Slice(msg.Data), &tr); err != nil {
logs.Error("handleTerminalResult: can't UnMarshal (%v): %s", err, buf)
return
}
err = checkShellToken(tr.Token, tr.Namespace, tr.Pod)
if err != nil {
logs.Error(http.StatusBadRequest, fmt.Sprintf("token (%s) not valid %v.", tr.Token, err))
return
}
manager, err := client.Manager(tr.Cluster)
if err == nil {
ts := TerminalSession{
id: tr.SessionId,
sockJSSession: session,
sizeChan: make(chan remotecommand.TerminalSize),
}
go WaitForTerminal(manager.Client, manager.Config, ts, tr.Namespace, tr.Pod, tr.Container, "")
return
} else {
logs.Error(http.StatusBadRequest, fmt.Sprintf("%s %v", tr.Cluster, err))
return
}
}
func CreateAttachHandler(path string) http.Handler {
return sockjs.NewHandler(path, sockjs.DefaultOptions, handleTerminalSession)
}
// @Title Create terminal
// @Param cmd query string true "the cmd you want to exec."
// @Param container query string true "the container name."
// @Description create container terminal
// @router /:pod/terminal/namespaces/:namespace/clusters/:cluster [post]
func (c *KubePodController) Terminal() {
cluster := c.Ctx.Input.Param(":cluster")
pod := c.Ctx.Input.Param(":pod")
container := c.Input().Get("container")
namespace := c.Ctx.Input.Param(":namespace")
cmd := c.Input().Get("cmd")
if pod == "" || container == "" {
c.AbortBadRequest("Pod and container are required!")
}
sessionId, err := genTerminalSessionId()
if err != nil {
c.HandleError(err)
return
}
c.Success(TerminalResult{
SessionId: sessionId,
Token: generateToken(namespace, pod),
Cluster: cluster,
Namespace: namespace,
Pod: pod,
Container: container,
Cmd: cmd,
})
}
// token生成规则
// 1. 拼接namespace、podName、unixtime(加600秒,十分钟期限),平台appkey,并进行md5加密操作
// 2. 取生成的32位加密字符串第12-20位,于unixtime进行拼接生成token
func generateToken(namespace string, pod string) string {
appKey := beego.AppConfig.String("appKey")
endTime := time.Now().Unix() + 60*10
rawTokenKey := namespace + pod + strconv.FormatInt(endTime, 10) + appKey
md5Hash := md5.New()
md5Hash.Write([]byte(rawTokenKey))
cipher := md5Hash.Sum(nil)
cipherStr := hex.EncodeToString(cipher)
return cipherStr[12:20] + strconv.FormatInt(endTime, 10)
}
func checkShellToken(token string, namespace string, podName string) error {
endTimeRaw := []rune(token)
var endTime int64
var endTimeStr string
var err error
if len(endTimeRaw) > 8 {
endTimeStr = string(endTimeRaw[8:])
endTime, err = strconv.ParseInt(endTimeStr, 10, 64)
if err != nil {
return err
}
}
ntime := time.Now().Unix()
if ntime > endTime {
return errors.New("token time expired")
}
rawToken := namespace + podName + endTimeStr + beego.AppConfig.String("appKey")
md5Ctx := md5.New()
md5Ctx.Write([]byte(rawToken))
cipherToken := hex.EncodeToString(md5Ctx.Sum(nil))
checkToken := string([]rune(cipherToken)[12:20]) + endTimeStr
if checkToken != token {
return errors.New("token not match")
}
return nil
}
// 开始建立ws连接
func startProcess(k8sClient *kubernetes.Clientset, cfg *rest.Config, cmd []string, ptyHandler PtyHandler, namespace, pod, container string) error {
req := k8sClient.CoreV1().RESTClient().Post().
Resource("pods").
Name(pod).
Namespace(namespace).
SubResource("exec")
req.VersionedParams(&v1.PodExecOptions{
Container: container,
Command: cmd,
Stdin: true,
Stdout: true,
Stderr: true,
TTY: true,
}, scheme.ParameterCodec)
exec, err := remotecommand.NewSPDYExecutor(cfg, "POST", req.URL())
if err != nil {
return err
}
err = exec.Stream(remotecommand.StreamOptions{
Stdin: ptyHandler,
Stdout: ptyHandler,
Stderr: ptyHandler,
TerminalSizeQueue: ptyHandler,
Tty: true,
})
if err != nil {
return err
}
return nil
}
func genTerminalSessionId() (string, error) {
bytes := make([]byte, 16)
if _, err := rand.Read(bytes); err != nil {
return "", err
}
id := make([]byte, hex.EncodedLen(len(bytes)))
hex.Encode(id, bytes)
return string(id), nil
}
func isValidShell(validShells []string, shell string) bool {
for _, validShell := range validShells {
if validShell == shell {
return true
}
}
return false
}
func WaitForTerminal(k8sClient *kubernetes.Clientset, cfg *rest.Config, ts TerminalSession, namespace, pod, container, cmd string) {
var err error
validShells := []string{"bash", "sh"}
if isValidShell(validShells, cmd) {
cmds := []string{cmd}
err = startProcess(k8sClient, cfg, cmds, ts, namespace, pod, container)
} else {
for _, testShell := range validShells {
cmd := []string{testShell}
if err = startProcess(k8sClient, cfg, cmd, ts, namespace, pod, container); err == nil {
break
}
}
}
if err != nil {
ts.Close(2, err.Error())
return
}
ts.Close(1, "Process exited")
}