sails.js如何构建实时Web控制台应用程序

Question

I'm new to sails.js, I only know the basics and am able to build simple MVC app. My boilerplate app: https://github.com/JerryYangJin/zero

I want to use sails.js to build a real time web console app.

The app works like this:

1. user types command in web browser

2. sails(socket.io) to call a native console program on the server, using user typed command as STDIN

3. sails(socket.io) to get native console program output from STDOUT then send it back to user.

Please advise, it would be great if there's open source example.

Thanks in advance!

Answer 1

Well, very simple code: simplest AJAX, no beaty. Just example. Code is tested and fully workable.

api/controllers/CliController.js

module.exports = {


  /**
   * Command execution
   * @param  {String} req.body.command [command ro execute]
   * @return {JSON}     [result or error]
   */
  run: function (req, res) {

    // Check for valid command string in request
    if (req.body === undefined || !req.body.command || req.body.command.trim().length === 0){
        return res.redirect('/cli/enter');
    }

    // Split string to array as `child_process` needs array
    var command = req.body.command.split(" "),
        err    = [],
        result = "";

    // Get needed module and execute command
    var spawn  = require('child_process').spawn,
        run = spawn(command.splice(0, 1)[0], command);

    run.stdout.on('data', function (data) {
        result =  result + data.toString();
    });

    run.stderr.on('data', function (data) {
        err.push(data.toString());
        console.log(data);
    });

    run.on('error', function (error) {
        err.push(error.toString());
        console.log(error);
        run.stdin.end();
    });

    run.on('close', function (code) {

        if (code !== 0) {
            err.push('ps process exited with code ' + code);
        }

        run.stdin.end();

        // Return error
        if (err.length > 0){
            res.status(500);
            return res.json({errors: err});
        }

        //Return data
        return res.ok(result);

    });
  },

  /**
   * Simple function to render view with command line
   */
  enter: function(req, res){

    return res.view();
  }
};

Enter a command view views/cli/enter.ejs

<input type="text" name="command" id="command"/>
<button id="sendCommand">Execute</button>

<pre id="result"></pre>

<script type="text/javascript">
    $('#sendCommand').click(function(){
        var command = $('#command').val().trim();

        if (command.length > 0){
            io.socket.post('/cli/run', {command: command}, function(data, jwr){
                if (jwr.statusCode == 200){
                    $('#result').text(data);
                } else {
                    $('#result').text('ERROR: ' + jwr.statusCode + JSON.stringify(data.errors));
                }
            });
        }
    });
</script>

Of course you MUST think about security.

I am using Node.js Child Process in the example.

Hope it helps.