ca-apm-probe/lib/module-detector.js

CA APM Node.js Agent monitors real-time health and performance of Node.js applications

 
/**
 * Copyright (c) 2015 CA. All rights reserved.
 *
 * This software and all information contained therein is confidential and proprietary and
 * shall not be duplicated, used, disclosed or disseminated in any way except as authorized
 * by the applicable license agreement, without the express written permission of CA. All
 * authorized reproductions must be marked with this language.
 *
 * EXCEPT AS SET FORTH IN THE APPLICABLE LICENSE AGREEMENT, TO THE EXTENT
 * PERMITTED BY APPLICABLE LAW, CA PROVIDES THIS SOFTWARE WITHOUT WARRANTY
 * OF ANY KIND, INCLUDING WITHOUT LIMITATION, ANY IMPLIED WARRANTIES OF
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL CA BE
 * LIABLE TO THE END USER OR ANY THIRD PARTY FOR ANY LOSS OR DAMAGE, DIRECT OR
 * INDIRECT, FROM THE USE OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, LOST
 * PROFITS, BUSINESS INTERRUPTION, GOODWILL, OR LOST DATA, EVEN IF CA IS
 * EXPRESSLY ADVISED OF SUCH LOSS OR DAMAGE.
 */

var path = require('path');

module.exports.detectModule = detectModule;
function detectModule(modulename, hasRun) {
  var location;

  try {
    location = require.resolve(modulename);
  } catch (err) {
  }

  if (location) {
    location = path.dirname(location);
    var version = require(path.resolve(location, 'package.json')).version;
    return version;
  } else if (!hasRun) {
    return detectModule(path.resolve(process.cwd(), 'node_modules', modulename),
                        true);
  }
  return null;
}