Merged feature/refactoring into develop
This commit is contained in:
commit
8069fee6f0
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@ -4,13 +4,14 @@
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### Added
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- New logging class to handle logging
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- Added togglable YouTube mode
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- Converts full URLs to YouTube share URLs
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- Checks against both YouTube full and share URLs to ensure same video not posted twice
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- New logging class to handle logging
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### Changed
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- Major refactor of a significant portion of the bot's code - should be easier to maintain now, but may have introduced some new bugs
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- Changed expected name for bot config file to bot-config.json rather than botConfig.json
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### Fixed
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- New timer being created every time the bot reconnected
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- New timer being created every time the bot reconnected
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358
feed-bot.js
358
feed-bot.js
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@ -1,184 +1,208 @@
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//external library imports
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var Dns = require("dns"); //for connectivity checking
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var Url = require("url"); //for url parsing
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var Uri = require("urijs"); //for finding urls within message strings
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var Discord = require("discord.io"); //for obvious reasons
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var FeedRead = require("feed-read"); //for rss feed reading
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//my imports
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var Log = require("./log.js"); //some very simple logging functions I made
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var BotConfig = require("./bot-config.json"); //bot config file containing bot token
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var Config = require("./config.json"); //config file containing other settings
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var Log = require("./log.js"); //some very simple logging functions I made
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//get a URL object from the feedUrl so we can examine it and check connectivity later
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var url = Url.parse(Config.feedUrl);
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var IS_FIRST_RUN = true;
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//placeholder for our bot - we need to check for connectivity before assigning this though
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var bot;
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var timer = false;
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var latestFeedLink = "";
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var linkRegExp = new RegExp(["http", "https", "www"].join("|"));
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var cachedLinks = [];
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var Bot = {
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bot: null,
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startup: function () {
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//check if we can connect to discordapp.com to authenticate the bot
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Dns.resolve("discordapp.com", function (err) {
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if (err) Log.error("CONNECTION ERROR: Unable to locate discordapp.com to authenticate the bot (you are probably not connected to the internet).", err);
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else {
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//if there was no error, go ahead and create and authenticate the bot
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Bot.bot = new Discord.Client({
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token: BotConfig.token,
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autorun: true
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});
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var youtubeShareUrl = "http://youtu.be/";
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var youtubeFullUrl = "http://www.youtube.com/watch?v=";
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//caches a link so we can check again later
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function cacheLink(link) {
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//cheaty way to get around http and https not matching
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link = link.replace("https://", "http://");
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//store the new link if not stored already
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if (!cachedLinks.includes(link)) {
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cachedLinks.push(link);
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Log.info("Cached URL: " + link);
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}
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//get rid of the first array element if we have reached our cache limit
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if (cachedLinks.length > (Config.numLinksToCache || 10))
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cachedLinks.shift();
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}
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function checkCache(link) {
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if (Config.youtubeMode && link.includes(youtubeFullUrl)) {
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return cachedLinks.includes(convertToYoutubeShareUrl(link));
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}
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return cachedLinks.includes(link);
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}
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function convertToYoutubeShareUrl(fullUrl) {
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var shareUrl = fullUrl.replace(youtubeFullUrl, youtubeShareUrl);
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var ampersandIdx = shareUrl.indexOf("&");
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if (ampersandIdx > -1)
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return shareUrl.slice(0, ampersandIdx);
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else
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return shareUrl;
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}
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//check if we can connect to discordapp.com to authenticate the bot
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Dns.resolve("discordapp.com", function (err) {
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if (err) Log.error("CONNECTION ERROR: Unable to locate discordapp.com to authenticate the bot (you are probably not connected to the internet).", err);
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else {
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//if there was no error, go ahead and create and authenticate the bot
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bot = new Discord.Client({
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token: BotConfig.token,
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autorun: true
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//set up the bot's event handlers
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Bot.bot.on("ready", Bot.onReady);
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Bot.bot.on("disconnect", Bot.onDisconnect);
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Bot.bot.on("message", Bot.onMessage);
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}
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});
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},
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onReady: function () {
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if (IS_FIRST_RUN) {
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IS_FIRST_RUN = false;
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//when the bot is ready, set a polling interval for the rss feed
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bot.on("ready", function () {
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Log.info("Registered bot " + bot.username + " - (" + bot.id + ")");
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//as we don't have any links cached, we need to check recent messages
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checkPreviousMessagesForLinks();
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Log.info("Registered bot " + Bot.bot.username + " - (" + Bot.bot.id + ")");
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Log.info("Setting up timer to check feed every " + Config.pollingInterval + " milliseconds");
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if (!timer) {
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setInterval(checkFeedAndPost, Config.pollingInterval);
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timer = true;
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}
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});
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bot.on("disconnect", function (err, code) {
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//do a bunch of logging
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Log.event("Bot was disconnected! " + code ? code : "No disconnect code provided", "Discord.io");
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if (err) Log.error("Bot disconnected!", err);
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Log.info("Trying to reconnect bot");
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//then actually attempt to reconnect
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bot.connect();
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});
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bot.on("message", function (user, userID, channelID, message) {
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//check if the message contains a link, in the right channel, and not the latest link from the rss feed
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if (channelID === Config.channelID && linkRegExp.test(message) && (message !== latestFeedLink)) {
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Log.event("Detected posted link in this message: " + message, "Discord.io");
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//detect the url inside the string, and cache it
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Uri.withinString(message, function (url) {
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cacheLink(url);
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return url;
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});
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}
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});
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}
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});
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function checkFeedAndPost() {
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//check that we have an internet connection (well not exactly - check that we have a connection to the host of the feedUrl)
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Dns.resolve(url.host, function (err) {
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if (err) Log.error("CONNECTION ERROR: Cannot resolve host (you are probably not connected to the internet)", err);
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else FeedRead(Config.feedUrl, checkLinkAndPost);
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});
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}
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//checks if the link has been posted previously, posts if not
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function checkLinkAndPost(err, articles) {
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if (err) Log.error("FEED ERROR: Error reading RSS feed.", err);
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else {
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//get the latest link and check if it has already been posted and cached
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var latestLink = articles[0].link.replace("https", "http");
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//check whether the latest link out the feed exists in our cache
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if (!checkCache(latestLink)) {
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if (Config.youtubeMode && latestLink.includes(youtubeFullUrl))
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latestLink = convertToYoutubeShareUrl(latestLink);
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Log.info("Attempting to post new link: " + latestLink);
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//send a messsage containing the new feed link to our discord channel
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bot.sendMessage({
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to: Config.channelID,
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message: latestLink
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}, function (err, message) {
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if (err) {
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Log.error("ERROR: Failed to send message: " + message.substring(0, 15) + "...", err);
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//if there is an error posting the message, check if it is because the bot isn't connected
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if (bot.connected)
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Log.info("Connectivity seems fine - I have no idea why the message didn't post");
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else {
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Log.error("Bot appears to be disconnected! Attempting to reconnect...", err);
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//attempt to reconnect
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bot.connect();
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}
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}
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});
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//finally make sure the link is cached, so it doesn't get posted again
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cacheLink(latestLink);
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//set up the timer to check the feed
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setInterval(Feed.checkAndPost, Config.pollingInterval);
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}
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else if (latestFeedLink != latestLink)
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//alternatively, if we have a new link from the feed, but its been posted already, just alert the console
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Log.info("Didn't post new feed link because already detected as posted " + latestLink);
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//ensure our latest feed link variable is up to date, so we can track when the feed updates
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latestFeedLink = latestLink;
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}
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}
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//gets last 100 messages and extracts any links found (for use on startup)
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function checkPreviousMessagesForLinks() {
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var limit = 100;
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Log.info("Attempting to check past " + limit + " messages for links");
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//get the last however many messsages from our discord channel
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bot.getMessages({
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channelID: Config.channelID,
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limit: limit
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}, function (err, messages) {
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if (err) Log.error("Error fetching discord messages.", err);
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else {
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Log.info("Pulled last " + messages.length + " messages, scanning for links");
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//extract an array of strings from the array of message objects
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var messageContents = messages.map((x) => { return x.content; }).reverse();
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for (var messageIdx in messageContents) {
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var message = messageContents[messageIdx];
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//test if the message contains a url
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if (linkRegExp.test(message))
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//detect the url inside the string, and cache it
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Uri.withinString(message, function (url) {
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cacheLink(url);
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return url;
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});
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}
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Log.info("Bot reconnected!");
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}
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});
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}
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//we need to check past messages for links on startup, but also on reconnect because we don't know what has happened during the downtime
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Bot.checkPastMessagesForLinks();
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},
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onDisconnect: function (err, code) {
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//do a bunch of logging
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Log.event("Bot was disconnected! " + code ? code : "No disconnect code provided", "Discord.io");
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if (err) Log.error("Bot disconnected!", err);
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Log.info("Trying to reconnect bot");
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//then actually attempt to reconnect
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Bot.bot.connect();
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},
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onMessage: function (user, userID, channelID, message) {
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//check if the message contains a link, in the right channel, and not the latest link from the rss feed
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if (channelID === Config.channelID && Links.regExp.test(message) && (message !== Links.latestFromFeed)) {
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Log.event("Detected posted link in this message: " + message, "Discord.io");
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//detect the url inside the string, and cache it
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Uri.withinString(message, function (url) {
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Links.cache(url);
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return url;
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});
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}
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},
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//gets last 100 messages and extracts any links found (for use on startup)
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checkPastMessagesForLinks: function () {
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var limit = 100;
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Log.info("Attempting to check past " + limit + " messages for links");
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//get the last however many messsages from our discord channel
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Bot.bot.getMessages({
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channelID: Config.channelID,
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limit: limit
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}, function (err, messages) {
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if (err) Log.error("Error fetching discord messages.", err);
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else {
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Log.info("Pulled last " + messages.length + " messages, scanning for links");
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//extract an array of strings from the array of message objects
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var messageContents = messages.map((x) => { return x.content; }).reverse();
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for (var messageIdx in messageContents) {
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var message = messageContents[messageIdx];
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//test if the message contains a url
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if (Links.regExp.test(message))
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//detect the url inside the string, and cache it
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Uri.withinString(message, function (url) {
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Links.cache(url);
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return url;
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});
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}
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}
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});
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}
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};
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var YouTube = {
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url: {
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share: "http://youtu.be/",
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full: "http://www.youtube.com/watch?v=",
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convertShareToFull: function (shareUrl) {
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return shareUrl.replace(YouTube.url.share, YouTube.url.full);
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},
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convertFullToShare: function (fullUrl) {
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var shareUrl = fullUrl.replace(YouTube.url.full, YouTube.url.share);
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if (shareUrl.includes("&"))
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shareUrl = shareUrl.slice(0, fullUrl.indexOf("&"));
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return shareUrl;
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}
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},
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};
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var Links = {
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regExp: new RegExp(["http", "https", "www"].join("|")),
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cached: [],
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latestFromFeed: "",
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cache: function (link) {
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//cheaty way to get around http and https not matching
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link = link.replace("https://", "http://");
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if(Config.youtubeMode && link.includes(YouTube.url.full)){
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link = YouTube.url.convertFullToShare(link);
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}
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//store the new link if not stored already
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if (!Links.cached.includes(link)) {
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Links.cached.push(link);
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Log.info("Cached URL: " + link);
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}
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//get rid of the first array element if we have reached our cache limit
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if (Links.cached.length > (Config.numLinksToCache || 10))
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Links.cached.shift();
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},
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checkCache: function (link) {
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if (Config.youtubeMode && link.includes(link)) {
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return Links.cached.includes(YouTube.url.convertFullToShare(link));
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}
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return Links.cached.includes(link);
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},
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validateAndPost: function (err, articles) {
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if (err) Log.error("FEED ERROR: Error reading RSS feed.", err);
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else {
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//get the latest link and check if it has already been posted and cached
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var latestLink = articles[0].link.replace("https", "http");
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//check whether the latest link out the feed exists in our cache
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if (!Links.checkCache(latestLink)) {
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if (Config.youtubeMode && latestLink.includes(YouTube.url.full))
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latestLink = YouTube.url.convertFullToShare(latestLink);
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Log.info("Attempting to post new link: " + latestLink);
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//send a messsage containing the new feed link to our discord channel
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Bot.bot.sendMessage({
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to: Config.channelID,
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message: latestLink
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}, function (err, message) {
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if (err) {
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Log.error("ERROR: Failed to send message: " + message.substring(0, 15) + "...", err);
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//if there is an error posting the message, check if it is because the bot isn't connected
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if (Bot.bot.connected)
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Log.info("Connectivity seems fine - I have no idea why the message didn't post");
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else {
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Log.error("Bot appears to be disconnected! Attempting to reconnect...", err);
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//attempt to reconnect
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Bot.bot.connect();
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}
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}
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});
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//finally make sure the link is cached, so it doesn't get posted again
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Links.cache(latestLink);
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}
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else if (Links.latestFromFeed != latestLink)
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//alternatively, if we have a new link from the feed, but its been posted already, just alert the console
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Log.info("Didn't post new feed link because already detected as posted " + latestLink);
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//ensure our latest feed link variable is up to date, so we can track when the feed updates
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Links.latestFromFeed = latestLink;
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}
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}
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};
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var Feed = {
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urlObj: Url.parse(Config.feedUrl),
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checkAndPost: function () {
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//check that we have an internet connection (well not exactly - check that we have a connection to the host of the feedUrl)
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Dns.resolve(Feed.urlObj.host, function (err) {
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if (err) Log.error("CONNECTION ERROR: Cannot resolve host (you are probably not connected to the internet)", err);
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else FeedRead(Config.feedUrl, Links.validateAndPost);
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});
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}
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};
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//IIFE to kickstart the bot when the app loads
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(function(){
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Bot.startup();
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})();
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Reference in New Issue