Migrate server to ESM

Sorry for the very big commit that may lead to git log issues and merge
conflicts, but it's a major step forward:

 * Server can be faster at startup because imports() are async and we can
   easily lazy import big modules
 * Angular doesn't seem to support ES import (with .js extension), so we
   had to correctly organize peertube into a monorepo:
    * Use yarn workspace feature
    * Use typescript reference projects for dependencies
    * Shared projects have been moved into "packages", each one is now a
      node module (with a dedicated package.json/tsconfig.json)
    * server/tools have been moved into apps/ and is now a dedicated app
      bundled and published on NPM so users don't have to build peertube
      cli tools manually
    * server/tests have been moved into packages/ so we don't compile
      them every time we want to run the server
 * Use isolatedModule option:
   * Had to move from const enum to const
     (https://www.typescriptlang.org/docs/handbook/enums.html#objects-vs-enums)
   * Had to explictely specify "type" imports when used in decorators
 * Prefer tsx (that uses esbuild under the hood) instead of ts-node to
   load typescript files (tests with mocha or scripts):
     * To reduce test complexity as esbuild doesn't support decorator
       metadata, we only test server files that do not import server
       models
     * We still build tests files into js files for a faster CI
 * Remove unmaintained peertube CLI import script
 * Removed some barrels to speed up execution (less imports)

1 files changed, 0 insertions, 198 deletions

diff --git a/server/lib/views/shared/video-viewer-counters.ts b/server/lib/views/shared/video-viewer-counters.ts
deleted file mode 100644
index f5b83130e..000000000
--- a/server/lib/views/shared/video-viewer-counters.ts
+++ /dev/null
@@ -1,198 +0,0 @@
-import { isTestOrDevInstance } 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')
-
-export type ViewerScope = 'local' | 'remote'
-export type VideoScope = 'local' | 'remote'
-
-type Viewer = {
-  expires: number
-  id: string
-  viewerScope: ViewerScope
-  videoScope: VideoScope
-  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, viewerScope: 'local' })
-    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, viewerScope: 'remote' })
-
-    return true
-  }
-
-  // ---------------------------------------------------------------------------
-
-  getTotalViewers (options: {
-    viewerScope: ViewerScope
-    videoScope: VideoScope
-  }) {
-    let total = 0
-
-    for (const viewers of this.viewersPerVideo.values()) {
-      total += viewers.filter(v => v.viewerScope === options.viewerScope && v.videoScope === options.videoScope).length
-    }
-
-    return total
-  }
-
-  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
-    viewerScope: ViewerScope
-    viewerExpires?: Date
-  }) {
-    const { video, viewerExpires, viewerId, viewerScope } = 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 videoScope: VideoScope = video.remote
-      ? 'remote'
-      : 'local'
-
-    const viewer = { id: viewerId, expires, videoScope, viewerScope }
-    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 (!isTestOrDevInstance()) 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 * 0.75)
-
-    if (viewer.lastFederation && viewer.lastFederation > federationLimit) return
-
-    await sendView({ byActor: await getServerActor(), video, type: 'viewer', viewerIdentifier: viewer.id })
-    viewer.lastFederation = now
-  }
-}