handle shutdown during incoming block processing in syncer

Author: redsh4de

binaries/cuprated/src/blockchain/syncer.rs

@@ -125,6 +125,9 @@ where
 
                     tracing::debug!("Got batch, len: {}", batch.blocks.len());
                     if incoming_block_batch_tx.send((batch, Arc::clone(&sync_permit))).await.is_err() {
+                        if shutdown_token.is_cancelled() {
+                            return Ok(());
+                        }
                         return Err(SyncerError::IncomingBlockChannelClosed);
                     }
                 }