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, 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({
  28       host: CONFIG.REDIS.HOSTNAME,
  29       port: CONFIG.REDIS.PORT,
  30       db: CONFIG.REDIS.DB
  31     })
  32
  33     this.client.on('error', err => {
  34       logger.error('Error in Redis client.', { err })
  35       process.exit(-1)
  36     })
  37
  38     if (CONFIG.REDIS.AUTH) {
  39       this.client.auth(CONFIG.REDIS.AUTH)
  40     }
  41
  42     this.prefix = 'redis-' + CONFIG.WEBSERVER.HOST + '-'
  43   }
  44
  45   async setResetPasswordVerificationString (userId: number) {
  46     const generatedString = await generateRandomString(32)
  47
  48     await this.setValue(this.generateResetPasswordKey(userId), generatedString, USER_PASSWORD_RESET_LIFETIME)
  49
  50     return generatedString
  51   }
  52
  53   async getResetPasswordLink (userId: number) {
  54     return this.getValue(this.generateResetPasswordKey(userId))
  55   }
  56
  57   setView (ip: string, videoUUID: string) {
  58     return this.setValue(this.buildViewKey(ip, videoUUID), '1', VIDEO_VIEW_LIFETIME)
  59   }
  60
  61   async isViewExists (ip: string, videoUUID: string) {
  62     return this.exists(this.buildViewKey(ip, videoUUID))
  63   }
  64
  65   async getCachedRoute (req: express.Request) {
  66     const cached = await this.getObject(this.buildCachedRouteKey(req))
  67
  68     return cached as CachedRoute
  69   }
  70
  71   setCachedRoute (req: express.Request, body: any, lifetime: number, contentType?: string, statusCode?: number) {
  72     const cached: CachedRoute = {
  73       body: body.toString(),
  74       contentType,
  75       statusCode: statusCode.toString()
  76     }
  77
  78     return this.setObject(this.buildCachedRouteKey(req), cached, lifetime)
  79   }
  80
  81   generateResetPasswordKey (userId: number) {
  82     return 'reset-password-' + userId
  83   }
  84
  85   buildViewKey (ip: string, videoUUID: string) {
  86     return videoUUID + '-' + ip
  87   }
  88
  89   buildCachedRouteKey (req: express.Request) {
  90     return req.method + '-' + req.originalUrl
  91   }
  92
  93   private getValue (key: string) {
  94     return new Promise<string>((res, rej) => {
  95       this.client.get(this.prefix + key, (err, value) => {
  96         if (err) return rej(err)
  97
  98         return res(value)
  99       })
 100     })
 101   }
 102
 103   private setValue (key: string, value: string, expirationMilliseconds: number) {
 104     return new Promise<void>((res, rej) => {
 105       this.client.set(this.prefix + key, value, 'PX', expirationMilliseconds, (err, ok) => {
 106         if (err) return rej(err)
 107
 108         if (ok !== 'OK') return rej(new Error('Redis set result is not OK.'))
 109
 110         return res()
 111       })
 112     })
 113   }
 114
 115   private setObject (key: string, obj: { [ id: string ]: string }, expirationMilliseconds: number) {
 116     return new Promise<void>((res, rej) => {
 117       this.client.hmset(this.prefix + key, obj, (err, ok) => {
 118         if (err) return rej(err)
 119         if (!ok) return rej(new Error('Redis mset result is not OK.'))
 120
 121         this.client.pexpire(this.prefix + key, expirationMilliseconds, (err, ok) => {
 122           if (err) return rej(err)
 123           if (!ok) return rej(new Error('Redis expiration result is not OK.'))
 124
 125           return res()
 126         })
 127       })
 128     })
 129   }
 130
 131   private getObject (key: string) {
 132     return new Promise<{ [ id: string ]: string }>((res, rej) => {
 133       this.client.hgetall(this.prefix + key, (err, value) => {
 134         if (err) return rej(err)
 135
 136         return res(value)
 137       })
 138     })
 139   }
 140
 141   private exists (key: string) {
 142     return new Promise<boolean>((res, rej) => {
 143       this.client.exists(this.prefix + key, (err, existsNumber) => {
 144         if (err) return rej(err)
 145
 146         return res(existsNumber === 1)
 147       })
 148     })
 149   }
 150
 151   static get Instance () {
 152     return this.instance || (this.instance = new this())
 153   }
 154 }
 155
 156 // ---------------------------------------------------------------------------
 157
 158 export {
 159   Redis
 160 }