Try to improve download speed

handler/handler_video_player.go

@@ -22,6 +22,12 @@ func (h *Handler) Watch(w http.ResponseWriter, r *http.Request, infoHash, fileNa
 		return
 	}
 
+	// This step is for speed up the download!
+	if err := h.torrentManager.CancelOthers(infoHash); err != nil {
+		handleError(w, r, "Cancel others", err, http.StatusBadRequest)
+		return
+	}
+
 	_ = ui.VideoPlayer(torrentInfo, fileName).Render(r.Context(), w)
 }
 
@@ -33,9 +39,10 @@ func (h *Handler) Stream(w http.ResponseWriter, r *http.Request, infoHash, fileN
 	}
 
 	// TODO: Maybe implement more effective file reader to seed up the download
+	file.Download()
 	reader := file.NewReader()
 	reader.SetResponsive()
-	reader.SetReadahead(file.Length() / 100) // Read ahead 1% of the file
+	//reader.SetReadahead(file.Length() / 100) // Read ahead 1% of the file
 
 	mime, err := mimetype.DetectReader(reader)
 	if err != nil {

torrent/manager_state.go

@@ -0,0 +1,21 @@
+package torrent
+
+import (
+	"fmt"
+)
+
+// CancelOthers cancels all pieces of all torrents except the one with the given info hash.
+func (m *Manager) CancelOthers(infoHash string) error {
+	infoHashHex, err := infoHashFromHexString(infoHash)
+	if err != nil {
+		return fmt.Errorf("parse infohash: %w", err)
+	}
+
+	for _, tor := range m.client.Torrents() {
+		if tor.InfoHash() != infoHashHex {
+			tor.CancelPieces(0, tor.NumPieces())
+		}
+	}
+
+	return nil
+}