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223 lines
4.8 KiB
Go
223 lines
4.8 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"os"
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"os/signal"
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"sync"
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"sync/atomic"
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"syscall"
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ttyServer "github.com/elisescu/tty-share/server"
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"github.com/gorilla/websocket"
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"github.com/moby/term"
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log "github.com/sirupsen/logrus"
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)
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type ttyShareClient struct {
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url string
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connection *websocket.Conn
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detachKeys string
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wcChan chan os.Signal
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writeFlag uint32 // used with atomic
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winSizes struct {
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thisW uint16
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thisH uint16
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remoteW uint16
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remoteH uint16
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}
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winSizesMutex sync.Mutex
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}
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func newTtyShareClient(url string, detachKeys string) *ttyShareClient {
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return &ttyShareClient{
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url: url,
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connection: nil,
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detachKeys: detachKeys,
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wcChan: make(chan os.Signal, 1),
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writeFlag: 1,
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}
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}
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func clearScreen() {
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fmt.Fprintf(os.Stdout, "\033[H\033[2J")
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}
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type wsTextWriter struct {
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conn *websocket.Conn
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}
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func (w *wsTextWriter) Write(data []byte) (n int, err error) {
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err = w.conn.WriteMessage(websocket.TextMessage, data)
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return len(data), err
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}
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type keyListener struct {
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wrappedReader io.Reader
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}
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func (kl *keyListener) Read(data []byte) (n int, err error) {
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n, err = kl.wrappedReader.Read(data)
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if _, ok := err.(term.EscapeError); ok {
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log.Debug("Escape code detected.")
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}
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return
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}
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func (c *ttyShareClient) updateAndDecideStdoutMuted() {
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log.Infof("This window: %dx%d. Remote window: %dx%d", c.winSizes.thisW, c.winSizes.thisH, c.winSizes.remoteW, c.winSizes.remoteH)
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if c.winSizes.thisH < c.winSizes.remoteH || c.winSizes.thisW < c.winSizes.remoteW {
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atomic.StoreUint32(&c.writeFlag, 0)
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clearScreen()
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fmt.Printf("\r\n\nYour terminal window has to be bigger than %dx%d\r\nDetach with <%s>, resize your window, and reconect.\r\n",
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c.winSizes.remoteW, c.winSizes.remoteH, c.detachKeys)
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} else {
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if atomic.LoadUint32(&c.writeFlag) == 0 { // clear the screen when changing back to "write"
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// TODO: notify the remote side to "refresh" the content.
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clearScreen()
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}
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atomic.StoreUint32(&c.writeFlag, 1)
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}
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}
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func (c *ttyShareClient) updateThisWinSize() {
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size, err := term.GetWinsize(os.Stdin.Fd())
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if err == nil {
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c.winSizesMutex.Lock()
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c.winSizes.thisW = size.Width
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c.winSizes.thisH = size.Height
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c.winSizesMutex.Unlock()
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}
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}
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func (c *ttyShareClient) Run() (err error) {
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log.Debugf("Connecting as a client to %s ..", c.url)
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resp, err := http.Get(c.url)
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if err != nil {
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return
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}
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// Get the path of the websockts route from the header
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wsPath := resp.Header.Get("TTYSHARE-WSPATH")
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// Build the WS URL from the host part of the given http URL and the wsPath
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httpURL, err := url.Parse(c.url)
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if err != nil {
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return
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}
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wsScheme := "ws"
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if httpURL.Scheme == "https" {
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wsScheme = "wss"
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}
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wsURL := wsScheme + "://" + httpURL.Host + wsPath
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log.Debugf("Built the WS URL from the headers: %s", wsURL)
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conn, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
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if err != nil {
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return
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}
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detachBytes, err := term.ToBytes(c.detachKeys)
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if err != nil {
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log.Errorf("Invalid dettaching keys: %s", c.detachKeys)
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return
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}
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state, err := term.MakeRaw(os.Stdin.Fd())
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defer term.RestoreTerminal(os.Stdin.Fd(), state)
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c.connection = conn
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clearScreen()
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// start monitoring the size of the terminal
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signal.Notify(c.wcChan, syscall.SIGWINCH)
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defer signal.Stop(c.wcChan)
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monitorWinChanges := func() {
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for {
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select {
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case <-c.wcChan:
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log.Debugf("Detected new win size")
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c.updateThisWinSize()
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c.updateAndDecideStdoutMuted()
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}
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}
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}
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readLoop := func() {
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for {
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var msg ttyServer.MsgAll
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_, r, err := conn.NextReader()
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if err != nil {
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log.Debugf("Connection closed")
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return
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}
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err = json.NewDecoder(r).Decode(&msg)
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if err != nil {
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log.Errorf("Cannot read JSON: %s", err.Error())
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}
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switch msg.Type {
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case ttyServer.MsgIDWrite:
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var msgWrite ttyServer.MsgTTYWrite
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err := json.Unmarshal(msg.Data, &msgWrite)
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if err != nil {
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log.Errorf("Cannot read JSON: %s", err.Error())
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}
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if atomic.LoadUint32(&c.writeFlag) != 0 {
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os.Stdout.Write(msgWrite.Data)
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}
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case ttyServer.MsgIDWinSize:
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var msgRemoteWinSize ttyServer.MsgTTYWinSize
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err := json.Unmarshal(msg.Data, &msgRemoteWinSize)
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if err != nil {
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continue
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}
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c.winSizesMutex.Lock()
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c.winSizes.remoteW = uint16(msgRemoteWinSize.Cols)
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c.winSizes.remoteH = uint16(msgRemoteWinSize.Rows)
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c.winSizesMutex.Unlock()
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c.updateThisWinSize()
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c.updateAndDecideStdoutMuted()
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}
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}
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}
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writeLoop := func() {
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ww := &wsTextWriter{
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conn: conn,
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}
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kl := &keyListener{
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wrappedReader: term.NewEscapeProxy(os.Stdin, detachBytes),
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}
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_, err := io.Copy(ttyServer.NewTTYProtocolWriter(ww), kl)
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if err != nil {
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log.Debugf("Connection closed")
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c.Stop()
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return
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}
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}
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go monitorWinChanges()
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go writeLoop()
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readLoop()
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clearScreen()
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return
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}
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func (c *ttyShareClient) Stop() {
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c.connection.Close()
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}
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