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import { isTestInstance } from '@server/helpers/core-utils'
import { logger, loggerTagsFactory } from '@server/helpers/logger'
import { VIEW_LIFETIME } from '@server/initializers/constants'
import { sendView } from '@server/lib/activitypub/send/send-view'
import { PeerTubeSocket } from '@server/lib/peertube-socket'
import { getServerActor } from '@server/models/application/application'
import { VideoModel } from '@server/models/video/video'
import { MVideo, MVideoImmutable } from '@server/types/models'
import { buildUUID, sha256 } from '@shared/extra-utils'
const lTags = loggerTagsFactory('views')
type Viewer = {
expires: number
id: string
lastFederation?: number
}
export class VideoViewerCounters {
// expires is new Date().getTime()
private readonly viewersPerVideo = new Map<number, Viewer[]>()
private readonly idToViewer = new Map<string, Viewer>()
private readonly salt = buildUUID()
private processingViewerCounters = false
constructor () {
setInterval(() => this.cleanViewerCounters(), VIEW_LIFETIME.VIEWER_COUNTER)
}
// ---------------------------------------------------------------------------
async addLocalViewer (options: {
video: MVideoImmutable
ip: string
}) {
const { video, ip } = options
logger.debug('Adding local viewer to video viewers counter %s.', video.uuid, { ...lTags(video.uuid) })
const viewerId = this.generateViewerId(ip, video.uuid)
const viewer = this.idToViewer.get(viewerId)
if (viewer) {
viewer.expires = this.buildViewerExpireTime()
await this.federateViewerIfNeeded(video, viewer)
return false
}
const newViewer = await this.addViewerToVideo({ viewerId, video })
await this.federateViewerIfNeeded(video, newViewer)
return true
}
async addRemoteViewer (options: {
video: MVideo
viewerId: string
viewerExpires: Date
}) {
const { video, viewerExpires, viewerId } = options
logger.debug('Adding remote viewer to video %s.', video.uuid, { ...lTags(video.uuid) })
await this.addViewerToVideo({ video, viewerExpires, viewerId })
return true
}
// ---------------------------------------------------------------------------
getViewers (video: MVideo) {
const viewers = this.viewersPerVideo.get(video.id)
if (!viewers) return 0
return viewers.length
}
buildViewerExpireTime () {
return new Date().getTime() + VIEW_LIFETIME.VIEWER_COUNTER
}
// ---------------------------------------------------------------------------
private async addViewerToVideo (options: {
video: MVideoImmutable
viewerId: string
viewerExpires?: Date
}) {
const { video, viewerExpires, viewerId } = options
let watchers = this.viewersPerVideo.get(video.id)
if (!watchers) {
watchers = []
this.viewersPerVideo.set(video.id, watchers)
}
const expires = viewerExpires
? viewerExpires.getTime()
: this.buildViewerExpireTime()
const viewer = { id: viewerId, expires }
watchers.push(viewer)
this.idToViewer.set(viewerId, viewer)
await this.notifyClients(video.id, watchers.length)
return viewer
}
private async cleanViewerCounters () {
if (this.processingViewerCounters) return
this.processingViewerCounters = true
if (!isTestInstance()) logger.info('Cleaning video viewers.', lTags())
try {
for (const videoId of this.viewersPerVideo.keys()) {
const notBefore = new Date().getTime()
const viewers = this.viewersPerVideo.get(videoId)
// Only keep not expired viewers
const newViewers: Viewer[] = []
// Filter new viewers
for (const viewer of viewers) {
if (viewer.expires > notBefore) {
newViewers.push(viewer)
} else {
this.idToViewer.delete(viewer.id)
}
}
if (newViewers.length === 0) this.viewersPerVideo.delete(videoId)
else this.viewersPerVideo.set(videoId, newViewers)
await this.notifyClients(videoId, newViewers.length)
}
} catch (err) {
logger.error('Error in video clean viewers scheduler.', { err, ...lTags() })
}
this.processingViewerCounters = false
}
private async notifyClients (videoId: string | number, viewersLength: number) {
const video = await VideoModel.loadImmutableAttributes(videoId)
if (!video) return
PeerTubeSocket.Instance.sendVideoViewsUpdate(video, viewersLength)
logger.debug('Video viewers update for %s is %d.', video.url, viewersLength, lTags())
}
private generateViewerId (ip: string, videoUUID: string) {
return sha256(this.salt + '-' + ip + '-' + videoUUID)
}
private async federateViewerIfNeeded (video: MVideoImmutable, viewer: Viewer) {
// Federate the viewer if it's been a "long" time we did not
const now = new Date().getTime()
const federationLimit = now - (VIEW_LIFETIME.VIEWER_COUNTER / 2)
if (viewer.lastFederation && viewer.lastFederation > federationLimit) return
await sendView({ byActor: await getServerActor(), video, type: 'viewer', viewerIdentifier: viewer.id })
viewer.lastFederation = now
}
}
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