Run Bash Script with Node from client request

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青春惊慌失措

I need to make a server-side script run when a user from the browser clicks a button...

I\'ve been researching for a while, and can\'t figure it out.

What we hav

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南旧

2021-02-02 02:31

Here's a simple boilerplate for the server (which uses Express, so you might need to install that first: npm install express):

var spawn   = require('child_process').spawn;
var express = require('express');
var app     = express();

app.use(express.static(__dirname));

app.get('/colorsRequest', function(req, res) {
  var command = spawn(__dirname + '/run.sh', [ req.query.color || '' ]);
  var output  = [];

  command.stdout.on('data', function(chunk) {
    output.push(chunk);
  }); 

  command.on('close', function(code) {
    if (code === 0)
      res.send(Buffer.concat(output));
    else
      res.send(500); // when the script fails, generate a Server Error HTTP response
  });
});

app.listen(3000);

You can pass it a color, and it will run the shellscript run.sh (of which it assumes is located in the same directory as the server JS file) with the color passed as argument:

curl -i localhost:3000/colorsRequest?color=green
# this runs './run.sh green' on the server

Here's a boilerplate HTML page (save it as index.html, put it in the same directory as the server code and the shell script, start the server, and open http://localhost:3000 in your browser):

<!doctype html>
<html>
  <head>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
  </head>
  <body>
    <select>
      <optgroup label="Pick a color:">
        <option>green</option>
        <option>blue</option>
        <option>yellow</option>
        <option>orange</option>
      </optgroup>
    </select>
    <script>
      $('select').on('change', function() {
        $.get('/colorsRequest', { color : $(this).val() });
      });
    </script>
  </body>
</html>

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被撕碎了的回忆

2021-02-02 02:37

You are on the right way with your first approach, the child_process.spawn variant. Ofcourse you can't put this in the HTML page, as it is then executed in the browser, not in the server, but you can easily create a request in the browser (AJAX or page load, depending on what you need), that triggers running this script in the server.

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