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