fix(sync): Fix end condition of the l2 sync

CHANGELOG.md

@@ -2,6 +2,7 @@ git # Deoxys Changelog
 
 ## Next release
 
+- fix(sync): Fix end condition of the l2 sync
 - fix(class): Fix Sierra classes conversion (missing abis)
 - fix(compute): Fixed prepare_data_availability_modes computation
 - feat(rpc): add pending block to `get_block_with_receipts` rpc call

crates/client/sync/src/l2.rs

@@ -137,7 +137,8 @@ pub struct SenderConfig {
 }
 
 /// Spawns workers to fetch blocks and state updates from the feeder.
-pub async fn sync<C>(mut sender_config: SenderConfig, fetch_config: FetchConfig, first_block: u64, client: Arc<C>)
+/// `n_blocks` is optionally the total number of blocks to sync, for debugging/benchmark purposes.
+pub async fn sync<C>(mut sender_config: SenderConfig, fetch_config: FetchConfig, first_block: u64, n_blocks: Option<usize>, client: Arc<C>)
 where
     C: HeaderBackend<DBlockT> + 'static,
 {
@@ -166,7 +167,7 @@ where
         }
     });
     // Have 10 fetches in parallel at once, using futures Buffered
-    let fetch_stream = stream::iter(fetch_stream).buffered(10);
+    let fetch_stream = stream::iter(fetch_stream.take(n_blocks.unwrap_or(usize::MAX))).buffered(10);
     let (fetch_stream_sender, mut fetch_stream_receiver) = mpsc::channel(10);
 
     tokio::select!(
@@ -182,9 +183,15 @@ where
             }
         } => {},
         // fetch blocks and updates in parallel
-        _ = fetch_stream.for_each(|val| async {
-            fetch_stream_sender.send(val).await.expect("receiver is closed");
-        }) => {},
+        _ = async {
+            fetch_stream.for_each(|val| async {
+                fetch_stream_sender.send(val).await.expect("receiver is closed");
+            }).await;
+
+            drop(fetch_stream_sender); // dropping the channel makes the recieving task stop once the queue is empty.
+
+            std::future::pending().await
+        } => {},
         // apply blocks and updates sequentially
         _ = async {
             let mut block_n = first_block;

crates/client/sync/src/lib.rs

@@ -41,7 +41,7 @@ pub mod starknet_sync_worker {
 
         let _ = tokio::join!(
             l1::sync(l1_url.clone()),
-            l2::sync(sender_config, fetch_config.clone(), starting_block.into(), client)
+            l2::sync(sender_config, fetch_config.clone(), starting_block.into(), None, client)
         );
     }
 }