server/lib/redis.ts

   1 import * as express from 'express'
   2 import { createClient, RedisClient } from 'redis'
   3 import { logger } from '../helpers/logger'
   4 import { generateRandomString } from '../helpers/utils'
   5 import { CONFIG, USER_PASSWORD_RESET_LIFETIME, USER_EMAIL_VERIFY_LIFETIME, VIDEO_VIEW_LIFETIME } from '../initializers'
   6
   7 type CachedRoute = {
   8   body: string,
   9   contentType?: string
  10   statusCode?: string
  11 }
  12
  13 class Redis {
  14
  15   private static instance: Redis
  16   private initialized = false
  17   private client: RedisClient
  18   private prefix: string
  19
  20   private constructor () {}
  21
  22   init () {
  23     // Already initialized
  24     if (this.initialized === true) return
  25     this.initialized = true
  26
  27     this.client = createClient(Redis.getRedisClient())
  28
  29     this.client.on('error', err => {
  30       logger.error('Error in Redis client.', { err })
  31       process.exit(-1)
  32     })
  33
  34     if (CONFIG.REDIS.AUTH) {
  35       this.client.auth(CONFIG.REDIS.AUTH)
  36     }
  37
  38     this.prefix = 'redis-' + CONFIG.WEBSERVER.HOST + '-'
  39   }
  40
  41   static getRedisClient () {
  42     return Object.assign({},
  43       (CONFIG.REDIS.AUTH && CONFIG.REDIS.AUTH != null) ? { password: CONFIG.REDIS.AUTH } : {},
  44       (CONFIG.REDIS.DB) ? { db: CONFIG.REDIS.DB } : {},
  45       (CONFIG.REDIS.HOSTNAME && CONFIG.REDIS.PORT) ?
  46       { host: CONFIG.REDIS.HOSTNAME, port: CONFIG.REDIS.PORT } :
  47       { path: CONFIG.REDIS.SOCKET }
  48     )
  49   }
  50
  51   /************* Forgot password *************/
  52
  53   async setResetPasswordVerificationString (userId: number) {
  54     const generatedString = await generateRandomString(32)
  55
  56     await this.setValue(this.generateResetPasswordKey(userId), generatedString, USER_PASSWORD_RESET_LIFETIME)
  57
  58     return generatedString
  59   }
  60
  61   async getResetPasswordLink (userId: number) {
  62     return this.getValue(this.generateResetPasswordKey(userId))
  63   }
  64
  65   /************* Email verification *************/
  66
  67   async setVerifyEmailVerificationString (userId: number) {
  68     const generatedString = await generateRandomString(32)
  69
  70     await this.setValue(this.generateVerifyEmailKey(userId), generatedString, USER_EMAIL_VERIFY_LIFETIME)
  71
  72     return generatedString
  73   }
  74
  75   async getVerifyEmailLink (userId: number) {
  76     return this.getValue(this.generateVerifyEmailKey(userId))
  77   }
  78
  79   /************* Views per IP *************/
  80
  81   setIPVideoView (ip: string, videoUUID: string) {
  82     return this.setValue(this.generateViewKey(ip, videoUUID), '1', VIDEO_VIEW_LIFETIME)
  83   }
  84
  85   async isVideoIPViewExists (ip: string, videoUUID: string) {
  86     return this.exists(this.generateViewKey(ip, videoUUID))
  87   }
  88
  89   /************* API cache *************/
  90
  91   async getCachedRoute (req: express.Request) {
  92     const cached = await this.getObject(this.generateCachedRouteKey(req))
  93
  94     return cached as CachedRoute
  95   }
  96
  97   setCachedRoute (req: express.Request, body: any, lifetime: number, contentType?: string, statusCode?: number) {
  98     const cached: CachedRoute = Object.assign({}, {
  99       body: body.toString()
 100     },
 101     (contentType) ? { contentType } : null,
 102     (statusCode) ? { statusCode: statusCode.toString() } : null
 103     )
 104
 105     return this.setObject(this.generateCachedRouteKey(req), cached, lifetime)
 106   }
 107
 108   /************* Video views *************/
 109
 110   addVideoView (videoId: number) {
 111     const keyIncr = this.generateVideoViewKey(videoId)
 112     const keySet = this.generateVideosViewKey()
 113
 114     return Promise.all([
 115       this.addToSet(keySet, videoId.toString()),
 116       this.increment(keyIncr)
 117     ])
 118   }
 119
 120   async getVideoViews (videoId: number, hour: number) {
 121     const key = this.generateVideoViewKey(videoId, hour)
 122
 123     const valueString = await this.getValue(key)
 124     return parseInt(valueString, 10)
 125   }
 126
 127   async getVideosIdViewed (hour: number) {
 128     const key = this.generateVideosViewKey(hour)
 129
 130     const stringIds = await this.getSet(key)
 131     return stringIds.map(s => parseInt(s, 10))
 132   }
 133
 134   deleteVideoViews (videoId: number, hour: number) {
 135     const keySet = this.generateVideosViewKey(hour)
 136     const keyIncr = this.generateVideoViewKey(videoId, hour)
 137
 138     return Promise.all([
 139       this.deleteFromSet(keySet, videoId.toString()),
 140       this.deleteKey(keyIncr)
 141     ])
 142   }
 143
 144   /************* Keys generation *************/
 145
 146   generateCachedRouteKey (req: express.Request) {
 147     return req.method + '-' + req.originalUrl
 148   }
 149
 150   private generateVideosViewKey (hour?: number) {
 151     if (!hour) hour = new Date().getHours()
 152
 153     return `videos-view-h${hour}`
 154   }
 155
 156   private generateVideoViewKey (videoId: number, hour?: number) {
 157     if (!hour) hour = new Date().getHours()
 158
 159     return `video-view-${videoId}-h${hour}`
 160   }
 161
 162   private generateResetPasswordKey (userId: number) {
 163     return 'reset-password-' + userId
 164   }
 165
 166   private generateVerifyEmailKey (userId: number) {
 167     return 'verify-email-' + userId
 168   }
 169
 170   private generateViewKey (ip: string, videoUUID: string) {
 171     return videoUUID + '-' + ip
 172   }
 173
 174   /************* Redis helpers *************/
 175
 176   private getValue (key: string) {
 177     return new Promise<string>((res, rej) => {
 178       this.client.get(this.prefix + key, (err, value) => {
 179         if (err) return rej(err)
 180
 181         return res(value)
 182       })
 183     })
 184   }
 185
 186   private getSet (key: string) {
 187     return new Promise<string[]>((res, rej) => {
 188       this.client.smembers(this.prefix + key, (err, value) => {
 189         if (err) return rej(err)
 190
 191         return res(value)
 192       })
 193     })
 194   }
 195
 196   private addToSet (key: string, value: string) {
 197     return new Promise<string[]>((res, rej) => {
 198       this.client.sadd(this.prefix + key, value, err => err ? rej(err) : res())
 199     })
 200   }
 201
 202   private deleteFromSet (key: string, value: string) {
 203     return new Promise<void>((res, rej) => {
 204       this.client.srem(this.prefix + key, value, err => err ? rej(err) : res())
 205     })
 206   }
 207
 208   private deleteKey (key: string) {
 209     return new Promise<void>((res, rej) => {
 210       this.client.del(this.prefix + key, err => err ? rej(err) : res())
 211     })
 212   }
 213
 214   private deleteFieldInHash (key: string, field: string) {
 215     return new Promise<void>((res, rej) => {
 216       this.client.hdel(this.prefix + key, field, err => err ? rej(err) : res())
 217     })
 218   }
 219
 220   private setValue (key: string, value: string, expirationMilliseconds: number) {
 221     return new Promise<void>((res, rej) => {
 222       this.client.set(this.prefix + key, value, 'PX', expirationMilliseconds, (err, ok) => {
 223         if (err) return rej(err)
 224
 225         if (ok !== 'OK') return rej(new Error('Redis set result is not OK.'))
 226
 227         return res()
 228       })
 229     })
 230   }
 231
 232   private setObject (key: string, obj: { [ id: string ]: string }, expirationMilliseconds: number) {
 233     return new Promise<void>((res, rej) => {
 234       this.client.hmset(this.prefix + key, obj, (err, ok) => {
 235         if (err) return rej(err)
 236         if (!ok) return rej(new Error('Redis mset result is not OK.'))
 237
 238         this.client.pexpire(this.prefix + key, expirationMilliseconds, (err, ok) => {
 239           if (err) return rej(err)
 240           if (!ok) return rej(new Error('Redis expiration result is not OK.'))
 241
 242           return res()
 243         })
 244       })
 245     })
 246   }
 247
 248   private getObject (key: string) {
 249     return new Promise<{ [ id: string ]: string }>((res, rej) => {
 250       this.client.hgetall(this.prefix + key, (err, value) => {
 251         if (err) return rej(err)
 252
 253         return res(value)
 254       })
 255     })
 256   }
 257
 258   private setValueInHash (key: string, field: string, value: string) {
 259     return new Promise<void>((res, rej) => {
 260       this.client.hset(this.prefix + key, field, value, (err) => {
 261         if (err) return rej(err)
 262
 263         return res()
 264       })
 265     })
 266   }
 267
 268   private increment (key: string) {
 269     return new Promise<number>((res, rej) => {
 270       this.client.incr(this.prefix + key, (err, value) => {
 271         if (err) return rej(err)
 272
 273         return res(value)
 274       })
 275     })
 276   }
 277
 278   private exists (key: string) {
 279     return new Promise<boolean>((res, rej) => {
 280       this.client.exists(this.prefix + key, (err, existsNumber) => {
 281         if (err) return rej(err)
 282
 283         return res(existsNumber === 1)
 284       })
 285     })
 286   }
 287
 288   static get Instance () {
 289     return this.instance || (this.instance = new this())
 290   }
 291 }
 292
 293 // ---------------------------------------------------------------------------
 294
 295 export {
 296   Redis
 297 }