Calling 3rd party in a new process

3rd-party-new-process.js

'use strict';
const cp = require('child_process');
const showdown = require('showdown');
const config = require('my-config');

const requestTimeout = config.get('app:requestTimeoutMs');

const converter = new showdown.Converter();

// in the master process
function markdownToHtml(markdown) {
  return new Promise((resolve, reject) => {
    const child = cp.fork(module.filename); // forking this module

    child.on('error', reject);

    let parseTimeout = setTimeout(() => {
      child.kill();
      reject(new Error('markdown timeout'));
    }, requestTimeout);

    child.on('message', message => {
      clearTimeout(parseTimeout);
      resolve(message.parsed);
    });

    child.send({ markdown });
  });
}

// in the child process
process.on('message', function (message) {
  try {
    let parsed = converter.makeHtml(message.markdown);
    process.send({ parsed });
    process.exit();
  }
  catch (err) {
    process.exit(-1);
  }
});

module.exports = {
  markdownToHtml
};