PeerTube/client/src/app/videos/video-watch/video-watch.component.ts

import { setInterval, setTimeout } from 'timers'
import { Component, ElementRef, NgZone, OnDestroy, OnInit, ViewChild } from '@angular/core';
import { ActivatedRoute } from '@angular/router';

import { MetaService } from 'ng2-meta';
import * as videojs from 'video.js';

import { VideoMagnetComponent } from './video-magnet.component';
import { VideoShareComponent } from './video-share.component';
import { Video, VideoService } from '../shared';
import { WebTorrentService } from './webtorrent.service';

@Component({
  selector: 'my-video-watch',
  templateUrl: './video-watch.component.html',
  styleUrls: [ './video-watch.component.scss' ]
})

export class VideoWatchComponent implements OnInit, OnDestroy {
  private static LOADTIME_TOO_LONG: number = 30000;

  @ViewChild('videoMagnetModal') videoMagnetModal: VideoMagnetComponent;
  @ViewChild('videoShareModal') videoShareModal: VideoShareComponent;

  downloadSpeed: number;
  error: boolean = false;
  loading: boolean = false;
  numPeers: number;
  player: VideoJSPlayer;
  playerElement: Element;
  uploadSpeed: number;
  video: Video = null;
  videoNotFound = false;

  private errorTimer: NodeJS.Timer;
  private sub: any;
  private torrentInfosInterval: NodeJS.Timer;

  constructor(
    private elementRef: ElementRef,
    private ngZone: NgZone,
    private route: ActivatedRoute,
    private videoService: VideoService,
    private metaService: MetaService,
    private webTorrentService: WebTorrentService
  ) {}

  ngOnInit() {
    this.sub = this.route.params.subscribe(routeParams => {
      let id = routeParams['id'];
      this.videoService.getVideo(id).subscribe(
        video => {
          this.video = video;
          this.setOpenGraphTags();
          this.loadVideo();
        },
        error => {
          this.videoNotFound = true;
        }
      );
    });

    this.playerElement = this.elementRef.nativeElement.querySelector('#video-container');

    const videojsOptions = {
      controls: true,
      autoplay: false
    };

    const self = this;
    videojs(this.playerElement, videojsOptions, function () {
      self.player = this;
    });
  }

  ngOnDestroy() {
    // Remove WebTorrent stuff
    console.log('Removing video from webtorrent.');
    clearInterval(this.torrentInfosInterval);
    clearTimeout(this.errorTimer);

    if (this.video !== null) {
      this.webTorrentService.remove(this.video.magnetUri);
    }

    // Remove player
    videojs(this.playerElement).dispose();

    // Unsubscribe route subscription
    this.sub.unsubscribe();
  }

  loadVideo() {
    // Reset the error
    this.error = false;
    // We are loading the video
    this.loading = true;

    console.log('Adding ' + this.video.magnetUri + '.');

    // The callback might never return if there are network issues
    // So we create a timer to inform the user the load is abnormally long
    this.errorTimer = setTimeout(() => this.loadTooLong(), VideoWatchComponent.LOADTIME_TOO_LONG);

    this.webTorrentService.add(this.video.magnetUri, (torrent) => {
      // Clear the error timer
      clearTimeout(this.errorTimer);
      // Maybe the error was fired by the timer, so reset it
      this.error = false;

      // We are not loading the video anymore
      this.loading = false;

      console.log('Added ' + this.video.magnetUri + '.');
      torrent.files[0].renderTo(this.playerElement, { autoplay: true }, (err) => {
        if (err) {
          alert('Cannot append the file.');
          console.error(err);
        }
      });

      this.runInProgress(torrent);
    });
  }

  showShareModal() {
    this.videoShareModal.show();
  }

  showMagnetUriModal() {
    this.videoMagnetModal.show();
  }

  private loadTooLong() {
    this.error = true;
    console.error('The video load seems to be abnormally long.');
  }

  private setOpenGraphTags() {
    this.metaService.setTag('og:type', 'video');

    this.metaService.setTag('og:title', this.video.name);
    this.metaService.setTag('name', this.video.name);

    this.metaService.setTag('og:description', this.video.description);
    this.metaService.setTag('description', this.video.description);

    this.metaService.setTag('og:image', this.video.thumbnailPath);

    this.metaService.setTag('og:duration', this.video.duration);

    this.metaService.setTag('og:site_name', 'PeerTube');

    this.metaService.setTag('og:url', window.location.href);
    this.metaService.setTag('url', window.location.href);
  }

  private runInProgress(torrent: any) {
    // Refresh each second
    this.torrentInfosInterval = setInterval(() => {
      this.ngZone.run(() => {
        this.downloadSpeed = torrent.downloadSpeed;
        this.numPeers = torrent.numPeers;
        this.uploadSpeed = torrent.uploadSpeed;
      });
    }, 1000);
  }
}