stub.js

var reportRoute = function (req, res) {
  // Validate input parameters
  req.assert("userId").notEmpty().isInt();
  req.assert("url").notEmpty().isUrl();
  req.assert("reportId").notEmpty().isInt();

  // Validate input
  var errors = req.validationErrors();

  // Handle errors
  if (errors) {
    res.json({ error: "Invalid parameter(s)", details: errors });
  } else {
    
    // Map a few variables
    var userId   = parseInt(req.param("userId"), 10)
      , url      = req.param("url")
      , reportId = req.param("reportId");

    
    reportStore.getReport(reportId, !!userId)
      .then(function (report) {
        return report.fetchCriteria()
      })
      .then(function (report) {
        if (report.isFallbackReport) {
          // store the fallback
          report.storeCriteria();
        }
        
        // serialize report and send to client
        report.createReadStream()
          .pipe(new Mustachifier(/* ... */))
          
      })
      .fail(function () {
        // send bad response
      });
      
  }
}