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 {
   6   CONTACT_FORM_LIFETIME,
   7   USER_EMAIL_VERIFY_LIFETIME,
   8   USER_PASSWORD_RESET_LIFETIME,
   9   VIDEO_VIEW_LIFETIME,
  10   WEBSERVER
  11 } from '../initializers/constants'
  12 import { CONFIG } from '../initializers/config'
  13
  14 type CachedRoute = {
  15   body: string,
  16   contentType?: string
  17   statusCode?: string
  18 }
  19
  20 class Redis {
  21
  22   private static instance: Redis
  23   private initialized = false
  24   private client: RedisClient
  25   private prefix: string
  26
  27   private constructor () {}
  28
  29   init () {
  30     // Already initialized
  31     if (this.initialized === true) return
  32     this.initialized = true
  33
  34     this.client = createClient(Redis.getRedisClientOptions())
  35
  36     this.client.on('error', err => {
  37       logger.error('Error in Redis client.', { err })
  38       process.exit(-1)
  39     })
  40
  41     if (CONFIG.REDIS.AUTH) {
  42       this.client.auth(CONFIG.REDIS.AUTH)
  43     }
  44
  45     this.prefix = 'redis-' + WEBSERVER.HOST + '-'
  46   }
  47
  48   static getRedisClientOptions () {
  49     return Object.assign({},
  50       (CONFIG.REDIS.AUTH && CONFIG.REDIS.AUTH != null) ? { password: CONFIG.REDIS.AUTH } : {},
  51       (CONFIG.REDIS.DB) ? { db: CONFIG.REDIS.DB } : {},
  52       (CONFIG.REDIS.HOSTNAME && CONFIG.REDIS.PORT) ?
  53       { host: CONFIG.REDIS.HOSTNAME, port: CONFIG.REDIS.PORT } :
  54       { path: CONFIG.REDIS.SOCKET }
  55     )
  56   }
  57
  58   getClient () {
  59     return this.client
  60   }
  61
  62   getPrefix () {
  63     return this.prefix
  64   }
  65
  66   /************* Forgot password *************/
  67
  68   async setResetPasswordVerificationString (userId: number) {
  69     const generatedString = await generateRandomString(32)
  70
  71     await this.setValue(this.generateResetPasswordKey(userId), generatedString, USER_PASSWORD_RESET_LIFETIME)
  72
  73     return generatedString
  74   }
  75
  76   async getResetPasswordLink (userId: number) {
  77     return this.getValue(this.generateResetPasswordKey(userId))
  78   }
  79
  80   /************* Email verification *************/
  81
  82   async setVerifyEmailVerificationString (userId: number) {
  83     const generatedString = await generateRandomString(32)
  84
  85     await this.setValue(this.generateVerifyEmailKey(userId), generatedString, USER_EMAIL_VERIFY_LIFETIME)
  86
  87     return generatedString
  88   }
  89
  90   async getVerifyEmailLink (userId: number) {
  91     return this.getValue(this.generateVerifyEmailKey(userId))
  92   }
  93
  94   /************* Contact form per IP *************/
  95
  96   async setContactFormIp (ip: string) {
  97     return this.setValue(this.generateContactFormKey(ip), '1', CONTACT_FORM_LIFETIME)
  98   }
  99
 100   async doesContactFormIpExist (ip: string) {
 101     return this.exists(this.generateContactFormKey(ip))
 102   }
 103
 104   /************* Views per IP *************/
 105
 106   setIPVideoView (ip: string, videoUUID: string) {
 107     return this.setValue(this.generateViewKey(ip, videoUUID), '1', VIDEO_VIEW_LIFETIME)
 108   }
 109
 110   async doesVideoIPViewExist (ip: string, videoUUID: string) {
 111     return this.exists(this.generateViewKey(ip, videoUUID))
 112   }
 113
 114   /************* API cache *************/
 115
 116   async getCachedRoute (req: express.Request) {
 117     const cached = await this.getObject(this.generateCachedRouteKey(req))
 118
 119     return cached as CachedRoute
 120   }
 121
 122   setCachedRoute (req: express.Request, body: any, lifetime: number, contentType?: string, statusCode?: number) {
 123     const cached: CachedRoute = Object.assign({}, {
 124       body: body.toString()
 125     },
 126     (contentType) ? { contentType } : null,
 127     (statusCode) ? { statusCode: statusCode.toString() } : null
 128     )
 129
 130     return this.setObject(this.generateCachedRouteKey(req), cached, lifetime)
 131   }
 132
 133   /************* Video views *************/
 134
 135   addVideoView (videoId: number) {
 136     const keyIncr = this.generateVideoViewKey(videoId)
 137     const keySet = this.generateVideosViewKey()
 138
 139     return Promise.all([
 140       this.addToSet(keySet, videoId.toString()),
 141       this.increment(keyIncr)
 142     ])
 143   }
 144
 145   async getVideoViews (videoId: number, hour: number) {
 146     const key = this.generateVideoViewKey(videoId, hour)
 147
 148     const valueString = await this.getValue(key)
 149     const valueInt = parseInt(valueString, 10)
 150
 151     if (isNaN(valueInt)) {
 152       logger.error('Cannot get videos views of video %d in hour %d: views number is NaN (%s).', videoId, hour, valueString)
 153       return undefined
 154     }
 155
 156     return valueInt
 157   }
 158
 159   async getVideosIdViewed (hour: number) {
 160     const key = this.generateVideosViewKey(hour)
 161
 162     const stringIds = await this.getSet(key)
 163     return stringIds.map(s => parseInt(s, 10))
 164   }
 165
 166   deleteVideoViews (videoId: number, hour: number) {
 167     const keySet = this.generateVideosViewKey(hour)
 168     const keyIncr = this.generateVideoViewKey(videoId, hour)
 169
 170     return Promise.all([
 171       this.deleteFromSet(keySet, videoId.toString()),
 172       this.deleteKey(keyIncr)
 173     ])
 174   }
 175
 176   /************* Keys generation *************/
 177
 178   generateCachedRouteKey (req: express.Request) {
 179     return req.method + '-' + req.originalUrl
 180   }
 181
 182   private generateVideosViewKey (hour?: number) {
 183     if (!hour) hour = new Date().getHours()
 184
 185     return `videos-view-h${hour}`
 186   }
 187
 188   private generateVideoViewKey (videoId: number, hour?: number) {
 189     if (!hour) hour = new Date().getHours()
 190
 191     return `video-view-${videoId}-h${hour}`
 192   }
 193
 194   private generateResetPasswordKey (userId: number) {
 195     return 'reset-password-' + userId
 196   }
 197
 198   private generateVerifyEmailKey (userId: number) {
 199     return 'verify-email-' + userId
 200   }
 201
 202   private generateViewKey (ip: string, videoUUID: string) {
 203     return `views-${videoUUID}-${ip}`
 204   }
 205
 206   private generateContactFormKey (ip: string) {
 207     return 'contact-form-' + ip
 208   }
 209
 210   /************* Redis helpers *************/
 211
 212   private getValue (key: string) {
 213     return new Promise<string>((res, rej) => {
 214       this.client.get(this.prefix + key, (err, value) => {
 215         if (err) return rej(err)
 216
 217         return res(value)
 218       })
 219     })
 220   }
 221
 222   private getSet (key: string) {
 223     return new Promise<string[]>((res, rej) => {
 224       this.client.smembers(this.prefix + key, (err, value) => {
 225         if (err) return rej(err)
 226
 227         return res(value)
 228       })
 229     })
 230   }
 231
 232   private addToSet (key: string, value: string) {
 233     return new Promise<string[]>((res, rej) => {
 234       this.client.sadd(this.prefix + key, value, err => err ? rej(err) : res())
 235     })
 236   }
 237
 238   private deleteFromSet (key: string, value: string) {
 239     return new Promise<void>((res, rej) => {
 240       this.client.srem(this.prefix + key, value, err => err ? rej(err) : res())
 241     })
 242   }
 243
 244   private deleteKey (key: string) {
 245     return new Promise<void>((res, rej) => {
 246       this.client.del(this.prefix + key, err => err ? rej(err) : res())
 247     })
 248   }
 249
 250   private deleteFieldInHash (key: string, field: string) {
 251     return new Promise<void>((res, rej) => {
 252       this.client.hdel(this.prefix + key, field, err => err ? rej(err) : res())
 253     })
 254   }
 255
 256   private setValue (key: string, value: string, expirationMilliseconds: number) {
 257     return new Promise<void>((res, rej) => {
 258       this.client.set(this.prefix + key, value, 'PX', expirationMilliseconds, (err, ok) => {
 259         if (err) return rej(err)
 260
 261         if (ok !== 'OK') return rej(new Error('Redis set result is not OK.'))
 262
 263         return res()
 264       })
 265     })
 266   }
 267
 268   private setObject (key: string, obj: { [ id: string ]: string }, expirationMilliseconds: number) {
 269     return new Promise<void>((res, rej) => {
 270       this.client.hmset(this.prefix + key, obj, (err, ok) => {
 271         if (err) return rej(err)
 272         if (!ok) return rej(new Error('Redis mset result is not OK.'))
 273
 274         this.client.pexpire(this.prefix + key, expirationMilliseconds, (err, ok) => {
 275           if (err) return rej(err)
 276           if (!ok) return rej(new Error('Redis expiration result is not OK.'))
 277
 278           return res()
 279         })
 280       })
 281     })
 282   }
 283
 284   private getObject (key: string) {
 285     return new Promise<{ [ id: string ]: string }>((res, rej) => {
 286       this.client.hgetall(this.prefix + key, (err, value) => {
 287         if (err) return rej(err)
 288
 289         return res(value)
 290       })
 291     })
 292   }
 293
 294   private setValueInHash (key: string, field: string, value: string) {
 295     return new Promise<void>((res, rej) => {
 296       this.client.hset(this.prefix + key, field, value, (err) => {
 297         if (err) return rej(err)
 298
 299         return res()
 300       })
 301     })
 302   }
 303
 304   private increment (key: string) {
 305     return new Promise<number>((res, rej) => {
 306       this.client.incr(this.prefix + key, (err, value) => {
 307         if (err) return rej(err)
 308
 309         return res(value)
 310       })
 311     })
 312   }
 313
 314   private exists (key: string) {
 315     return new Promise<boolean>((res, rej) => {
 316       this.client.exists(this.prefix + key, (err, existsNumber) => {
 317         if (err) return rej(err)
 318
 319         return res(existsNumber === 1)
 320       })
 321     })
 322   }
 323
 324   static get Instance () {
 325     return this.instance || (this.instance = new this())
 326   }
 327 }
 328
 329 // ---------------------------------------------------------------------------
 330
 331 export {
 332   Redis
 333 }