reclusive-middleware.js

var _ = require("underscore");
var helper = {};
var middleware = {};

helper.reclusive = function(callback) {
  var items = [];
  items.push(function(req, res, next) {
    return callback(null, req, res, next);
  });
  items.push(function(err, req, res, next) {
    return callback(err, req, res, next);
  });
  return items;
}

middleware.random = function(req, res, next){
  var random = !! Math.round(Math.random() * 1);
  var err = (random) ? new Error("there's an error") : null;
  return next(err);
}

middleware.log = function(err, req, res, next){
  // send something to database regardless of error
  console.log("database");
  return next(err);
}

middleware.send = function(err, req, res, next){
  if(err) return res.send("yeah "+ err.message)
  return res.send("no error");
}

module.exports = _.flatten([
  middleware.random,
  helper.reclusive(middleware.log),
  helper.reclusive(middleware.send),
]);