youtube-dl refactor (#956)

* Consolidated all youtube-dl calls into one function
* Downloads can now be cancelled and better "paused"
* Removed node-youtube-dl dependency
* Added ability to manually check a subscription, and to cancel a subscription check

---------

Co-authored-by: Dedy Martadinata S <dedyms@proton.me>

src/app/main/main.component.ts

@@ -169,6 +169,8 @@ export class MainComponent implements OnInit {
   argsChangedSubject: Subject<boolean> = new Subject<boolean>();
   simulatedOutput = '';
 
+  interval_id = null;
+
   constructor(public postsService: PostsService, private youtubeSearch: YoutubeSearchService, public snackBar: MatSnackBar,
     private router: Router, public dialog: MatDialog, private platform: Platform, private route: ActivatedRoute) {
     this.audioOnly = false;
@@ -232,11 +234,12 @@ export class MainComponent implements OnInit {
     }
 
     // get downloads routine
-    setInterval(() => {
+    if (this.interval_id) { clearInterval(this.interval_id) }
+    this.interval_id = setInterval(() => {
       if (this.current_download) {
         this.getCurrentDownload();
       }
-    }, 500);
+    }, 1000);
 
     return true;
   }
@@ -294,6 +297,10 @@ export class MainComponent implements OnInit {
     }
   }
 
+  ngOnDestroy(): void {
+    if (this.interval_id) { clearInterval(this.interval_id) }
+  }
+
   // download helpers
   downloadHelper(container: DatabaseFile | Playlist, type: string, is_playlist = false, force_view = false, navigate_mode = false): void {
     this.downloadingfile = false;