new: feat: add magnet-metadata-api post processor (#39)

* new: feat: add magnet-metadata-api post processor

* chg: fix: lint issue

* chg: chore: comment optional containers

* chg: fix: remove redundant check

api/comando_torrents.go

@@ -94,7 +94,7 @@ func (i *Indexer) HandlerComandoIndexer(w http.ResponseWriter, r *http.Request)
 	})
 
 	// extract each torrent link
-	indexedTorrents := utils.ParallelMap(links, func(link string) ([]schema.IndexedTorrent, error) {
+	indexedTorrents := utils.ParallelFlatMap(links, func(link string) ([]schema.IndexedTorrent, error) {
 		return getTorrents(ctx, i, link)
 	})
 
@@ -208,6 +208,11 @@ func getTorrents(ctx context.Context, i *Indexer, link string) ([]schema.Indexed
 			if len(size) == len(magnetLinks) {
 				mySize = size[it]
 			}
+			if mySize == "" {
+				go func() {
+					_, _ = i.magnetMetadataAPI.FetchMetadata(ctx, magnetLink)
+				}()
+			}
 
 			ixt := schema.IndexedTorrent{
 				Title:         releaseTitle,