/
shell.go
261 lines (243 loc) · 5.81 KB
/
shell.go
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// Copyright 2015 tsuru authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package api
import (
"bytes"
"fmt"
"io"
"net/http"
"strconv"
"sync"
"time"
"unicode"
"github.com/gorilla/websocket"
"github.com/tsuru/tsuru/api/context"
"github.com/tsuru/tsuru/app"
"github.com/tsuru/tsuru/errors"
"github.com/tsuru/tsuru/event"
"github.com/tsuru/tsuru/permission"
"github.com/tsuru/tsuru/provision"
terminal "golang.org/x/term"
)
var _ io.ReadWriteCloser = &cmdLogger{}
type cmdLogger struct {
sync.Mutex
base io.ReadWriteCloser
term io.Writer
addComplete bool
}
func (l *cmdLogger) Read(p []byte) (n int, err error) {
// XXX(cezarsa): this way of capturing executed commands is ugly, unreliable
// and error prone. It's here as a proof of concept and it's probably better
// than nothing. I will think about a better approach to this in the future.
// For now, I already spent too much time tweaking this code.
n, err = l.base.Read(p)
if err != nil || n == 0 {
return
}
l.term.Write(p[:n])
l.Lock()
defer l.Unlock()
l.addComplete = p[n-1] == '\t'
return
}
func (l *cmdLogger) Write(p []byte) (n int, err error) {
n, err = l.base.Write(p)
l.Lock()
defer l.Unlock()
if l.addComplete {
for _, c := range string(p) {
if unicode.IsPrint(c) {
l.term.Write([]byte(string(c)))
}
}
if len(p) == 0 || p[len(p)-1] != '\a' {
l.addComplete = false
}
}
return
}
func (l *cmdLogger) Close() error {
return l.base.Close()
}
type optionalWriterCloser struct {
bytes.Buffer
disableWrite bool
}
func (l *optionalWriterCloser) Write(p []byte) (int, error) {
if l.disableWrite {
return len(p), nil
}
return l.Buffer.Write(p)
}
func (l *optionalWriterCloser) Close() error {
return nil
}
var upgrader = websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool {
return true
},
}
var (
pongWait = 60 * time.Second
pingInterval = 20 * time.Second
)
// title: app shell
// path: /apps/{name}/shell
// method: GET
// produce: Websocket connection upgrade
// responses:
//
// 101: Switch Protocol to websocket
func remoteShellHandler(w http.ResponseWriter, r *http.Request) {
ws, err := upgrader.Upgrade(w, r, nil)
if err != nil {
fmt.Fprintf(w, "unable to upgrade ws connection: %v", err)
return
}
var httpErr *errors.HTTP
defer func() {
if httpErr != nil {
var msg string
switch httpErr.Code {
case http.StatusUnauthorized:
msg = "no token provided or session expired, please login again\n"
default:
msg = httpErr.Message + "\n"
}
ws.WriteMessage(websocket.TextMessage, []byte("Error: "+msg))
}
ws.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
ws.Close()
}()
token := context.GetAuthToken(r)
if token == nil {
httpErr = &errors.HTTP{
Code: http.StatusUnauthorized,
Message: "no token provided",
}
return
}
appName := r.URL.Query().Get(":appname")
a, err := getAppFromContext(appName, r)
if err != nil {
if herr, ok := err.(*errors.HTTP); ok {
httpErr = herr
} else {
httpErr = &errors.HTTP{
Code: http.StatusInternalServerError,
Message: err.Error(),
}
}
return
}
allowed := permission.Check(token, permission.PermAppRunShell, contextsForApp(&a)...)
if !allowed {
httpErr = permission.ErrUnauthorized
return
}
buf := &optionalWriterCloser{}
var term *terminal.Terminal
unitID := r.URL.Query().Get("unit")
isolated, _ := strconv.ParseBool(r.URL.Query().Get("isolated"))
width, _ := strconv.Atoi(r.URL.Query().Get("width"))
height, _ := strconv.Atoi(r.URL.Query().Get("height"))
clientTerm := r.URL.Query().Get("term")
evt, err := event.New(&event.Opts{
Target: appTarget(appName),
Kind: permission.PermAppRunShell,
Owner: token,
RemoteAddr: r.RemoteAddr,
CustomData: event.FormToCustomData(InputFields(r)),
Allowed: event.Allowed(permission.PermAppReadEvents, contextsForApp(&a)...),
DisableLock: true,
})
if err != nil {
httpErr = &errors.HTTP{
Code: http.StatusInternalServerError,
Message: err.Error(),
}
return
}
defer func() {
var finalErr error
if httpErr != nil {
finalErr = httpErr
}
for term != nil {
buf.disableWrite = true
var line string
line, err = term.ReadLine()
if err != nil {
break
}
fmt.Fprintf(evt, "> %s\n", line)
}
evt.Done(finalErr)
}()
term = terminal.NewTerminal(buf, "")
ws.SetReadDeadline(time.Now().Add(pongWait))
ws.SetPongHandler(func(string) error {
ws.SetReadDeadline(time.Now().Add(pongWait))
return nil
})
quit := make(chan struct{})
defer close(quit)
go func() {
for {
select {
case <-quit:
return
case <-time.After(pingInterval):
}
ws.WriteControl(websocket.PingMessage, nil, time.Now().Add(2*time.Second))
}
}()
conn := &cmdLogger{base: &wsReadWriteCloser{ws}, term: term}
opts := provision.ExecOptions{
Stdout: conn,
Stderr: conn,
Stdin: conn,
Width: width,
Height: height,
Units: unitsForShell(a, unitID, isolated),
Term: clientTerm,
}
err = a.Shell(opts)
if err != nil {
httpErr = &errors.HTTP{
Code: http.StatusInternalServerError,
Message: err.Error(),
}
}
}
func unitsForShell(a app.App, unitID string, isolated bool) []string {
if isolated {
return nil
}
if unitID != "" {
return []string{unitID}
}
appUnits, _ := a.Units()
if len(appUnits) > 0 {
return []string{appUnits[0].ID}
}
return nil
}
type wsReadWriteCloser struct {
*websocket.Conn
}
func (c *wsReadWriteCloser) Read(p []byte) (n int, err error) {
messageType, r, err := c.NextReader()
if err != nil {
return 0, err
}
if messageType != websocket.TextMessage {
return 0, nil
}
return r.Read(p)
}
func (c *wsReadWriteCloser) Write(p []byte) (n int, err error) {
return len(p), c.Conn.WriteMessage(websocket.TextMessage, p)
}