github.com/iqoqo/nomad@v0.11.3-0.20200911112621-d7021c74d101/ui/app/utils/classes/exec-socket-xterm-adapter.js (about)

     1  const ANSI_UI_GRAY_400 = '\x1b[38;2;142;150;163m';
     2  
     3  import base64js from 'base64-js';
     4  import { TextDecoderLite, TextEncoderLite } from 'text-encoder-lite';
     5  
     6  export default class ExecSocketXtermAdapter {
     7    constructor(terminal, socket, token) {
     8      this.terminal = terminal;
     9      this.socket = socket;
    10      this.token = token;
    11  
    12      socket.onopen = () => {
    13        this.sendWsHandshake();
    14        this.sendTtySize();
    15  
    16        terminal.onData(data => {
    17          this.handleData(data);
    18        });
    19      };
    20  
    21      socket.onmessage = e => {
    22        let json = JSON.parse(e.data);
    23  
    24        // stderr messages will not be produced as the socket is opened with the tty flag
    25        if (json.stdout && json.stdout.data) {
    26          terminal.write(decodeString(json.stdout.data));
    27        }
    28      };
    29  
    30      socket.onclose = () => {
    31        this.terminal.writeln('');
    32        this.terminal.write(ANSI_UI_GRAY_400);
    33        this.terminal.writeln('The connection has closed.');
    34        // Issue to add interpretation of close events: https://github.com/hashicorp/nomad/issues/7464
    35      };
    36  
    37      terminal.resized = () => {
    38        this.sendTtySize();
    39      };
    40    }
    41  
    42    sendTtySize() {
    43      this.socket.send(
    44        JSON.stringify({ tty_size: { width: this.terminal.cols, height: this.terminal.rows } })
    45      );
    46    }
    47  
    48    sendWsHandshake() {
    49      this.socket.send(JSON.stringify({ version: 1, auth_token: this.token || '' }));
    50    }
    51  
    52    handleData(data) {
    53      this.socket.send(JSON.stringify({ stdin: { data: encodeString(data) } }));
    54    }
    55  }
    56  
    57  function encodeString(string) {
    58    let encoded = new TextEncoderLite('utf-8').encode(string);
    59    return base64js.fromByteArray(encoded);
    60  }
    61  
    62  function decodeString(b64String) {
    63    let uint8array = base64js.toByteArray(b64String);
    64    return new TextDecoderLite('utf-8').decode(uint8array);
    65  }