import * as express from 'express' import { createClient, RedisClient } from 'redis' import { logger } from '../helpers/logger' import { generateRandomString } from '../helpers/utils' import { CONFIG, USER_PASSWORD_RESET_LIFETIME, USER_EMAIL_VERIFY_LIFETIME, VIDEO_VIEW_LIFETIME } from '../initializers' type CachedRoute = { body: string, contentType?: string statusCode?: string } class Redis { private static instance: Redis private initialized = false private client: RedisClient private prefix: string private constructor () {} init () { // Already initialized if (this.initialized === true) return this.initialized = true this.client = createClient(Redis.getRedisClient()) this.client.on('error', err => { logger.error('Error in Redis client.', { err }) process.exit(-1) }) if (CONFIG.REDIS.AUTH) { this.client.auth(CONFIG.REDIS.AUTH) } this.prefix = 'redis-' + CONFIG.WEBSERVER.HOST + '-' } static getRedisClient () { return Object.assign({}, (CONFIG.REDIS.AUTH && CONFIG.REDIS.AUTH != null) ? { password: CONFIG.REDIS.AUTH } : {}, (CONFIG.REDIS.DB) ? { db: CONFIG.REDIS.DB } : {}, (CONFIG.REDIS.HOSTNAME && CONFIG.REDIS.PORT) ? { host: CONFIG.REDIS.HOSTNAME, port: CONFIG.REDIS.PORT } : { path: CONFIG.REDIS.SOCKET } ) } /************* Forgot password *************/ async setResetPasswordVerificationString (userId: number) { const generatedString = await generateRandomString(32) await this.setValue(this.generateResetPasswordKey(userId), generatedString, USER_PASSWORD_RESET_LIFETIME) return generatedString } async getResetPasswordLink (userId: number) { return this.getValue(this.generateResetPasswordKey(userId)) } /************* Email verification *************/ async setVerifyEmailVerificationString (userId: number) { const generatedString = await generateRandomString(32) await this.setValue(this.generateVerifyEmailKey(userId), generatedString, USER_EMAIL_VERIFY_LIFETIME) return generatedString } async getVerifyEmailLink (userId: number) { return this.getValue(this.generateVerifyEmailKey(userId)) } /************* Views per IP *************/ setIPVideoView (ip: string, videoUUID: string) { return this.setValue(this.generateViewKey(ip, videoUUID), '1', VIDEO_VIEW_LIFETIME) } async isVideoIPViewExists (ip: string, videoUUID: string) { return this.exists(this.generateViewKey(ip, videoUUID)) } /************* API cache *************/ async getCachedRoute (req: express.Request) { const cached = await this.getObject(this.generateCachedRouteKey(req)) return cached as CachedRoute } setCachedRoute (req: express.Request, body: any, lifetime: number, contentType?: string, statusCode?: number) { const cached: CachedRoute = Object.assign({}, { body: body.toString() }, (contentType) ? { contentType } : null, (statusCode) ? { statusCode: statusCode.toString() } : null ) return this.setObject(this.generateCachedRouteKey(req), cached, lifetime) } /************* Video views *************/ addVideoView (videoId: number) { const keyIncr = this.generateVideoViewKey(videoId) const keySet = this.generateVideosViewKey() return Promise.all([ this.addToSet(keySet, videoId.toString()), this.increment(keyIncr) ]) } async getVideoViews (videoId: number, hour: number) { const key = this.generateVideoViewKey(videoId, hour) const valueString = await this.getValue(key) const valueInt = parseInt(valueString, 10) if (isNaN(valueInt)) { logger.error('Cannot get videos views of video %d in hour %d: views number is NaN (%s).', videoId, hour, valueString) return undefined } return valueInt } async getVideosIdViewed (hour: number) { const key = this.generateVideosViewKey(hour) const stringIds = await this.getSet(key) return stringIds.map(s => parseInt(s, 10)) } deleteVideoViews (videoId: number, hour: number) { const keySet = this.generateVideosViewKey(hour) const keyIncr = this.generateVideoViewKey(videoId, hour) return Promise.all([ this.deleteFromSet(keySet, videoId.toString()), this.deleteKey(keyIncr) ]) } /************* Keys generation *************/ generateCachedRouteKey (req: express.Request) { return req.method + '-' + req.originalUrl } private generateVideosViewKey (hour?: number) { if (!hour) hour = new Date().getHours() return `videos-view-h${hour}` } private generateVideoViewKey (videoId: number, hour?: number) { if (!hour) hour = new Date().getHours() return `video-view-${videoId}-h${hour}` } private generateResetPasswordKey (userId: number) { return 'reset-password-' + userId } private generateVerifyEmailKey (userId: number) { return 'verify-email-' + userId } private generateViewKey (ip: string, videoUUID: string) { return videoUUID + '-' + ip } /************* Redis helpers *************/ private getValue (key: string) { return new Promise((res, rej) => { this.client.get(this.prefix + key, (err, value) => { if (err) return rej(err) return res(value) }) }) } private getSet (key: string) { return new Promise((res, rej) => { this.client.smembers(this.prefix + key, (err, value) => { if (err) return rej(err) return res(value) }) }) } private addToSet (key: string, value: string) { return new Promise((res, rej) => { this.client.sadd(this.prefix + key, value, err => err ? rej(err) : res()) }) } private deleteFromSet (key: string, value: string) { return new Promise((res, rej) => { this.client.srem(this.prefix + key, value, err => err ? rej(err) : res()) }) } private deleteKey (key: string) { return new Promise((res, rej) => { this.client.del(this.prefix + key, err => err ? rej(err) : res()) }) } private deleteFieldInHash (key: string, field: string) { return new Promise((res, rej) => { this.client.hdel(this.prefix + key, field, err => err ? rej(err) : res()) }) } private setValue (key: string, value: string, expirationMilliseconds: number) { return new Promise((res, rej) => { this.client.set(this.prefix + key, value, 'PX', expirationMilliseconds, (err, ok) => { if (err) return rej(err) if (ok !== 'OK') return rej(new Error('Redis set result is not OK.')) return res() }) }) } private setObject (key: string, obj: { [ id: string ]: string }, expirationMilliseconds: number) { return new Promise((res, rej) => { this.client.hmset(this.prefix + key, obj, (err, ok) => { if (err) return rej(err) if (!ok) return rej(new Error('Redis mset result is not OK.')) this.client.pexpire(this.prefix + key, expirationMilliseconds, (err, ok) => { if (err) return rej(err) if (!ok) return rej(new Error('Redis expiration result is not OK.')) return res() }) }) }) } private getObject (key: string) { return new Promise<{ [ id: string ]: string }>((res, rej) => { this.client.hgetall(this.prefix + key, (err, value) => { if (err) return rej(err) return res(value) }) }) } private setValueInHash (key: string, field: string, value: string) { return new Promise((res, rej) => { this.client.hset(this.prefix + key, field, value, (err) => { if (err) return rej(err) return res() }) }) } private increment (key: string) { return new Promise((res, rej) => { this.client.incr(this.prefix + key, (err, value) => { if (err) return rej(err) return res(value) }) }) } private exists (key: string) { return new Promise((res, rej) => { this.client.exists(this.prefix + key, (err, existsNumber) => { if (err) return rej(err) return res(existsNumber === 1) }) }) } static get Instance () { return this.instance || (this.instance = new this()) } } // --------------------------------------------------------------------------- export { Redis }