friends_glob.js

var async = require('async');

function getUserFriends(userName, next) {
    db.users.findOne({name:userName}, foundUser);

    var glob = {};

    function foundUser(err, user) {
        if (err != null) return next(err);

        glob.user = user;
        getFriendsById(user.id, gotFriends);
    }

    function gotFriends(err, friends) {
        if (err != null) return next(err);

        glob.friends = friends;

        if (glob.user.type == 'power user') {
            async.map(friends, getFriendsById, wtfFriendAction);
        } else {
            return next(null, friends);
        }

    }

    function wtfFriendAction(err, friendsOfFriends) {
        for (var i = 0; i < friendsOfFriends.length; i++) {
            for (var j = 0; j < friendsOfFriends[i].length; j++) {
                if (glob.friends.indexOf(friendsOfFriends[i][j]) != -1) {
                    glob.friends.push(friendsOfFriends[i][j]);
                }
            }
        }
        return next(null, glob.friends);
    }
}

function getFriendsById(userId, next) {
    db.friends.find({userId:userId}, function (err, friends) {
        if (err != null) return next(err);
        return next(null, friends);
    });
}

friends_vars.js

var async = require('async');

function getUserFriends(userName, next) {
    db.users.findOne({name:userName}, foundUser);

    var user, friends;

    function foundUser(err, _user) {
        if (err != null) return next(err);

        user = _user;
        getFriendsById(user.id, gotFriends);
    }

    function gotFriends(err, _friends) {
        if (err != null) return next(err);

        friends = _friends;

        if (user.type == 'power user') {
            async.map(friends, getFriendsById, wtfFriendAction);
        } else {
            return next(null, friends);
        }

    }

    function wtfFriendAction(err, friendsOfFriends) {
        for (var i = 0; i < friendsOfFriends.length; i++) {
            for (var j = 0; j < friendsOfFriends[i].length; j++) {
                if (friends.indexOf(friendsOfFriends[i][j]) != -1) {
                    friends.push(friendsOfFriends[i][j]);
                }
            }
        }
        return next(null, friends);
    }
}

function getFriendsById(userId, next) {
    db.friends.find({userId:userId}, function (err, friends) {
        if (err != null) return next(err);
        return next(null, friends);
    });
}