async demo

demo.js

function some_fun(req,res,next) {
  asyc.waterfall([
    function getNewObjectID(callback) {
      redis.incr('next_id', callback);
    },
    function storeObject(r, callback) {
      var object = {id:r, now:Date.now()};
      redis.set('key', object, callback);
    },
    function sendResponse(_, callback) {
      res.send([1,'ok']);
    }
  ], next);
}