server/lib/views/shared/video-viewer-stats.ts

   1 import { Transaction } from 'sequelize/types'
   2 import { isTestInstance } from '@server/helpers/core-utils'
   3 import { GeoIP } from '@server/helpers/geo-ip'
   4 import { logger, loggerTagsFactory } from '@server/helpers/logger'
   5 import { MAX_LOCAL_VIEWER_WATCH_SECTIONS, VIEW_LIFETIME } from '@server/initializers/constants'
   6 import { sequelizeTypescript } from '@server/initializers/database'
   7 import { sendCreateWatchAction } from '@server/lib/activitypub/send'
   8 import { getLocalVideoViewerActivityPubUrl } from '@server/lib/activitypub/url'
   9 import { Redis } from '@server/lib/redis'
  10 import { VideoModel } from '@server/models/video/video'
  11 import { LocalVideoViewerModel } from '@server/models/view/local-video-viewer'
  12 import { LocalVideoViewerWatchSectionModel } from '@server/models/view/local-video-viewer-watch-section'
  13 import { MVideo, MVideoImmutable } from '@server/types/models'
  14 import { VideoViewEvent } from '@shared/models'
  15
  16 const lTags = loggerTagsFactory('views')
  17
  18 type LocalViewerStats = {
  19   firstUpdated: number // Date.getTime()
  20   lastUpdated: number // Date.getTime()
  21
  22   watchSections: {
  23     start: number
  24     end: number
  25   }[]
  26
  27   watchTime: number
  28
  29   country: string
  30
  31   videoId: number
  32 }
  33
  34 export class VideoViewerStats {
  35   private processingViewersStats = false
  36
  37   constructor () {
  38     setInterval(() => this.processViewerStats(), VIEW_LIFETIME.VIEWER_STATS)
  39   }
  40
  41   // ---------------------------------------------------------------------------
  42
  43   async addLocalViewer (options: {
  44     video: MVideoImmutable
  45     currentTime: number
  46     ip: string
  47     viewEvent?: VideoViewEvent
  48   }) {
  49     const { video, ip, viewEvent, currentTime } = options
  50
  51     logger.debug('Adding local viewer to video stats %s.', video.uuid, { currentTime, viewEvent, ...lTags(video.uuid) })
  52
  53     return this.updateLocalViewerStats({ video, viewEvent, currentTime, ip })
  54   }
  55
  56   // ---------------------------------------------------------------------------
  57
  58   async getWatchTime (videoId: number, ip: string) {
  59     const stats: LocalViewerStats = await Redis.Instance.getLocalVideoViewer({ ip, videoId })
  60
  61     return stats?.watchTime || 0
  62   }
  63
  64   // ---------------------------------------------------------------------------
  65
  66   private async updateLocalViewerStats (options: {
  67     video: MVideoImmutable
  68     ip: string
  69     currentTime: number
  70     viewEvent?: VideoViewEvent
  71   }) {
  72     const { video, ip, viewEvent, currentTime } = options
  73     const nowMs = new Date().getTime()
  74
  75     let stats: LocalViewerStats = await Redis.Instance.getLocalVideoViewer({ ip, videoId: video.id })
  76
  77     if (stats && stats.watchSections.length >= MAX_LOCAL_VIEWER_WATCH_SECTIONS) {
  78       logger.warn('Too much watch section to store for a viewer, skipping this one', { currentTime, viewEvent, ...lTags(video.uuid) })
  79       return
  80     }
  81
  82     if (!stats) {
  83       const country = await GeoIP.Instance.safeCountryISOLookup(ip)
  84
  85       stats = {
  86         firstUpdated: nowMs,
  87         lastUpdated: nowMs,
  88
  89         watchSections: [],
  90
  91         watchTime: 0,
  92
  93         country,
  94         videoId: video.id
  95       }
  96     }
  97
  98     stats.lastUpdated = nowMs
  99
 100     if (viewEvent === 'seek' || stats.watchSections.length === 0) {
 101       stats.watchSections.push({
 102         start: currentTime,
 103         end: currentTime
 104       })
 105     } else {
 106       const lastSection = stats.watchSections[stats.watchSections.length - 1]
 107       lastSection.end = currentTime
 108     }
 109
 110     stats.watchTime = this.buildWatchTimeFromSections(stats.watchSections)
 111
 112     logger.debug('Set local video viewer stats for video %s.', video.uuid, { stats, ...lTags(video.uuid) })
 113
 114     await Redis.Instance.setLocalVideoViewer(ip, video.id, stats)
 115   }
 116
 117   async processViewerStats () {
 118     if (this.processingViewersStats) return
 119     this.processingViewersStats = true
 120
 121     if (!isTestInstance()) logger.info('Processing viewer statistics.', lTags())
 122
 123     const now = new Date().getTime()
 124
 125     try {
 126       const allKeys = await Redis.Instance.listLocalVideoViewerKeys()
 127
 128       for (const key of allKeys) {
 129         const stats: LocalViewerStats = await Redis.Instance.getLocalVideoViewer({ key })
 130
 131         // Process expired stats
 132         if (stats.lastUpdated > now - VIEW_LIFETIME.VIEWER_STATS) {
 133           continue
 134         }
 135
 136         try {
 137           await sequelizeTypescript.transaction(async t => {
 138             const video = await VideoModel.load(stats.videoId, t)
 139             if (!video) return
 140
 141             const statsModel = await this.saveViewerStats(video, stats, t)
 142
 143             if (video.remote) {
 144               await sendCreateWatchAction(statsModel, t)
 145             }
 146           })
 147
 148           await Redis.Instance.deleteLocalVideoViewersKeys(key)
 149         } catch (err) {
 150           logger.error('Cannot process viewer stats for Redis key %s.', key, { err, ...lTags() })
 151         }
 152       }
 153     } catch (err) {
 154       logger.error('Error in video save viewers stats scheduler.', { err, ...lTags() })
 155     }
 156
 157     this.processingViewersStats = false
 158   }
 159
 160   private async saveViewerStats (video: MVideo, stats: LocalViewerStats, transaction: Transaction) {
 161     const statsModel = new LocalVideoViewerModel({
 162       startDate: new Date(stats.firstUpdated),
 163       endDate: new Date(stats.lastUpdated),
 164       watchTime: stats.watchTime,
 165       country: stats.country,
 166       videoId: video.id
 167     })
 168
 169     statsModel.url = getLocalVideoViewerActivityPubUrl(statsModel)
 170     statsModel.Video = video as VideoModel
 171
 172     await statsModel.save({ transaction })
 173
 174     statsModel.WatchSections = await LocalVideoViewerWatchSectionModel.bulkCreateSections({
 175       localVideoViewerId: statsModel.id,
 176       watchSections: stats.watchSections,
 177       transaction
 178     })
 179
 180     return statsModel
 181   }
 182
 183   private buildWatchTimeFromSections (sections: { start: number, end: number }[]) {
 184     return sections.reduce((p, current) => p + (current.end - current.start), 0)
 185   }
 186 }