working example of hand-written async on a redis server

blog.js

exports.list = function(req, cb) {
  client.get(MODELSET_ID + ":blog:entries", function(err, blogLen) {
    if (err) { console.log(err); }

    var retList = [];
    function done (retBlog) {
      console.log("pushing id: " + retBlog.metadata._id);
      retList.push(retBlog);
      blogLen--;
      if (blogLen <= 0) { cb(retList); }
    }

    for (var id = 1; id <= blogLen; id++) {
      blogById(id, function(retBlog) {
        done(retBlog);
      });
    }
  });
};


function blogById(blogId, cb) {
  var len = 4; // The number of calls we'll be making
  var obj = {};
  function callback () {
    console.log("cb len: " + len);
    len--;
    if (len <= 0) { cb(obj); }
  }
  client.hgetall(MODELSET_ID + ":blog:entry:" + blogId, function(err, reply) {
    obj["metadata"] = reply;
    console.log('metadata ' + reply);
    callback();
  });
  client.hgetall(MODELSET_ID + ":blog:entry:" + blogId + ":content", function(err, reply) {
    obj["content"] = reply;
    console.log('content ' + reply);
    callback();
  });
  client.hgetall(MODELSET_ID + ":blog:entry:" + blogId + ":author", function(err, reply) {
    obj["author"] = reply;
    console.log('author ' + reply);
    callback();
  });
  client.hgetall(MODELSET_ID + ":blog:entry:" + blogId + ":datetime", function(err, reply) {
    obj["datetime"] = reply;
    console.log('datetime ' + reply);
    callback();
  });
}