Redis Timer System

structures/Client.js

@@ -4,6 +4,8 @@ const Collection = require('@discordjs/collection');
 const winston = require('winston');
 const fs = require('fs');
 const path = require('path');
+const Redis = require('./Redis');
+const TimerManager = require('./timer/TimerManager');
 const PokemonStore = require('./pokemon/PokemonStore');
 const MemePosterClient = require('./MemePoster');
 const activities = require('../assets/json/activity');
@@ -30,7 +32,9 @@ module.exports = class XiaoClient extends CommandoClient {
 				winston.format.printf(log => `[${log.timestamp}] [${log.level.toUpperCase()}]: ${log.message}`)
 			)
 		});
+		this.redis = Redis ? Redis.db : null;
 		this.webhook = new WebhookClient(XIAO_WEBHOOK_ID, XIAO_WEBHOOK_TOKEN, { disableMentions: 'everyone' });
+		this.timers = new TimerManager(this);
 		this.pokemon = new PokemonStore();
 		this.memePoster = POSTER_ID && POSTER_TOKEN ? new MemePosterClient(POSTER_ID, POSTER_TOKEN, {
 			subreddits,

structures/Redis.js

@@ -0,0 +1,22 @@
+const Redis = require('ioredis');
+const { REDIS_HOST, REDIS_PASS } = process.env;
+const redis = new Redis({
+	port: 6379,
+	host: REDIS_HOST,
+	enableReadyCheck: true,
+	password: REDIS_PASS,
+	db: 0
+});
+
+module.exports = class RedisClient {
+	static get db() {
+		return redis;
+	}
+
+	static start() {
+		redis.on('connect', () => console.info('[REDIS][CONNECT]: Connecting...'));
+		redis.on('ready', () => console.info('[REDIS][READY]: Ready!'));
+		redis.on('error', error => console.error(`[REDIS][ERROR]: Encountered error:\n${error}`));
+		redis.on('reconnecting', () => console.warn('[REDIS][RECONNECT]: Reconnecting...'));
+	}
+};

structures/timer/TimerManager.js

@@ -0,0 +1,34 @@
+const Redis = require('../Redis');
+
+module.exports = class TimerManager {
+	constructor(client) {
+		Object.defineProperty(this, 'client', { value: client });
+	}
+
+	async fetchAll() {
+		const timers = await Redis.db.hgetall('timer');
+		for (const data of Object.keys(timers)) {
+			data = JSON.parse(data);
+			await this.setTimer(data.channelID, new Date(data.time) - new Date(), data.userID, data.title, false);
+		}
+		return this;
+	}
+
+	async setTimer(channelID, time, userID, title, updateRedis = true) {
+		const data = { time: new Date(Date.now() + time).toISOString(), channelID, userID, title };
+		const timeout = setTimeout(async () => {
+			try {
+				const channel = await this.client.channels.fetch(channelID);
+				await channel.send(`🕰️ <@${userID}>, you wanted me to remind you of: **"${title}"**.`);
+			} finally {
+				await Redis.db.hdel('timer', `${channelID}-${userID}`);
+			}
+		}, time);
+		if (updateRedis) await Redis.db.hset('timer', { [`${channelID}-${userID}`]: JSON.stringify(data) });
+		return timeout;
+	}
+
+	exists(channelID, userID) {
+		return Redis.db.hexists('timer', `${channelID}-${userID}`);
+	}
+};