NodeJS - Sequential tasking - Random RSS feed selector

node_sequential_tasking.js

var path = require('path'),
	fs = require('fs'),
	request = require('request'),
	htmlparser = require('htmlparser'),
	tasks = [];

function getRssFeeds(){
	var configFileName = "./rss_feeds.txt";
	path.exists(configFileName, function(exists){
		if(!exists){
			next('Create a list of RSS Feeds in the file ./rss_feeds.txt');
		} else {
			next(false, configFileName);
		}
	});
};

function selectRandomFeed(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 requestFeed(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 showRssItem(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);
	}
};

tasks.push(getRssFeeds);
tasks.push(selectRandomFeed);
tasks.push(requestFeed);
tasks.push(showRssItem);

next();