gulp task for running protractor e2e test on saucelabs through sauce connect

gistfile1.js

var sauceConnectLauncher = require('sauce-connect-launcher');

// connects to saucelabs server and runs protractor e2e tests against saucelabs server
gulp.task('e2e_protractor_sauce', function() {
  sauceConnectLauncher({
    username: 'xxx',
    accessKey: 'xxxx',
    // logger: console.log
  }, function (err, sauceConnectProcess) {
    if (err) {
      console.error(err.message);
      return;
    }
    console.log("Sauce Connect ready");

    gulp.src(["./src/tests/*.js"])
      .pipe(protractor({
        configFile: "e2e/protractor.saucelabs.conf.js"
      }))
      .on('error', function(e) {
        sauceConnectProcess.close(function () {
          console.log("Closed Sauce Connect process");
        });
        throw e;
      })
      .on('end', function(e) {
        sauceConnectProcess.close(function () {
          console.log("Closed Sauce Connect process");
        });
      });

  });
});