feat: implement download peer

src/message/peer/upload_failed.rs

@@ -10,7 +10,7 @@ impl MessageHandler<PeerOperation> for UploadFailedHandler {
     fn get_code(&self) -> u8 {
         46
     }
-    fn handle(&self, message: &mut Message, sender: Sender<PeerOperation>) {
+    fn handle(&self, message: &mut Message, _sender: Sender<PeerOperation>) {
         let upload_failed = UploadFailed::new_from_message(message);
         info!("Upload failed for ${}", upload_failed.filename);
     }