random_story.js

var fs = require('fs')
    , request = require('request')
    , htmlparser = require('htmlparser');

var tasks = [
    function () {
        var configFilename = './data/rss_feeds.txt';
        fs.exists(configFilename, function (exists) {
            if (!exists) {
                next('Create a list of RSS feeds in the file ./rss_feeds.txt.');
            } else {
                next(false, configFilename);
            }
        });
    },
    function (configFilename) {
        fs.readFile(configFilename, function (err, feedList) {
            if (err) {
                next(err.message);
            } else {
                feedList = feedList
                    .toString()
                    .replace(/^\s+|\s+$/g, '')
                    .split("\n");
                var random = Math.floor(Math.random()
                * feedList.length);
                next(false, feedList[random]);
            }
        });
    },
    function (feedUrl) {
        request({uri: feedUrl}, function (err, response, body) {
            if (err) {
                next(err.message);
            } else if (response.statusCode == 200) {
                next(false, body);
            } else {
                next('Abnormal request status code.');
            }
        });
    },
    function (rss) {
        var handler = new htmlparser.RssHandler();
        var parser = new htmlparser.Parser(handler);
        parser.parseComplete(rss);


        if (handler.dom.items.length) {
            var item = handler.dom.items.shift();
            console.log(item.title);
            console.log(item.link);
        } else {
            next('No RSS items found.');
        }
    }
];
function next(err, result) {
    if (err) throw new Error(err);
    var currentTask = tasks.shift();
    if (currentTask) {
        currentTask(result);
    }
}
next();