chore: add nested multiplexing test

sdk/src/network/mod.rs

@@ -21,7 +21,7 @@ pub mod matchbox;
 pub mod messaging;
 pub mod setup;
 
-#[derive(Debug, Serialize, Deserialize, Clone, Copy)]
+#[derive(Debug, Serialize, Deserialize, Clone, Copy, Default)]
 pub struct IdentifierInfo {
     pub block_id: Option<u64>,
     pub session_id: Option<u64>,
@@ -317,6 +317,12 @@ impl NetworkMultiplexer {
     }
 }
 
+impl<N: Network> From<N> for NetworkMultiplexer {
+    fn from(network: N) -> Self {
+        Self::new(network)
+    }
+}
+
 pub struct SubNetwork {
     tx: MultiplexedSender,
     rx: Mutex<MultiplexedReceiver>,
@@ -423,18 +429,14 @@ mod tests {
             .try_init();
     }
 
-    #[tokio::test(flavor = "multi_thread")]
-    async fn p2p() {
-        setup_log();
-        let nodes = stream::iter(0..NODE_COUNT)
-            .map(|_| node())
-            .collect::<Vec<_>>()
-            .await;
+    async fn wait_for_nodes_connected(nodes: &[GossipHandle]) {
+        let node_count = nodes.len();
+
         // wait for the nodes to connect to each other
-        let max_retries = 30 * NODE_COUNT;
+        let max_retries = 30 * node_count;
         let mut retry = 0;
         loop {
-            crate::debug!(%NODE_COUNT, %max_retries, %retry, "Checking if all nodes are connected to each other");
+            crate::debug!(%node_count, %max_retries, %retry, "Checking if all nodes are connected to each other");
             let connected = nodes
                 .iter()
                 .map(|node| node.connected_peers())
@@ -444,17 +446,29 @@ mod tests {
                 .iter()
                 .enumerate()
                 .inspect(|(node, peers)| crate::debug!("Node {node} has {peers} connected peers"))
-                .all(|(_, &peers)| peers == usize::from(NODE_COUNT) - 1);
+                .all(|(_, &peers)| peers == node_count - 1);
             if all_connected {
-                break;
+                crate::debug!("All nodes are connected to each other");
+                return;
             }
             tokio::time::sleep(tokio::time::Duration::from_millis(300)).await;
             retry += 1;
             if retry > max_retries {
                 panic!("Failed to connect all nodes to each other");
             }
         }
-        crate::debug!("All nodes are connected to each other");
+    }
+
+    #[tokio::test(flavor = "multi_thread")]
+    async fn p2p() {
+        setup_log();
+        let nodes = stream::iter(0..NODE_COUNT)
+            .map(|_| node())
+            .collect::<Vec<_>>()
+            .await;
+
+        wait_for_nodes_connected(&nodes).await;
+
         let mut tasks = Vec::new();
         let barrier = Arc::new(Barrier::new(NODE_COUNT as usize));
         for (i, node) in nodes.into_iter().enumerate() {
@@ -681,4 +695,82 @@ mod tests {
         ))
         .unwrap()
     }
+
+    #[tokio::test(flavor = "multi_thread")]
+    async fn test_nested_multiplexer() {
+        setup_log();
+        crate::info!("Starting test_nested_multiplexer");
+        let network0 = node();
+        let network1 = node();
+
+        let mut networks = vec![network0, network1];
+
+        wait_for_nodes_connected(&networks).await;
+
+        let (network0, network1) = (networks.remove(0), networks.remove(0));
+
+        async fn nested_multiplex<N: Network>(
+            cur_depth: usize,
+            max_depth: usize,
+            network0: N,
+            network1: N,
+        ) {
+            crate::info!("At nested depth = {cur_depth}/{max_depth}");
+
+            if cur_depth == max_depth {
+                return;
+            }
+
+            let multiplexer0 = NetworkMultiplexer::new(network0);
+            let multiplexer1 = NetworkMultiplexer::new(network1);
+
+            let stream_key = StreamKey {
+                task_hash: sha2_256(&[(cur_depth % 255) as u8]),
+                round_id: 0,
+            };
+
+            let subnetwork0 = multiplexer0.multiplex(stream_key);
+            let subnetwork1 = multiplexer1.multiplex(stream_key);
+
+            // Send a message in the subnetwork0 to subnetwork1 and vice versa, assert values of message
+            let payload = vec![1, 2, 3];
+            let msg = GossipHandle::build_protocol_message(
+                IdentifierInfo::default(),
+                0,
+                Some(1),
+                &payload,
+                None,
+                None,
+            );
+
+            subnetwork0.send(msg.clone()).unwrap();
+
+            let received_msg = subnetwork1.recv().await.unwrap();
+            assert_eq!(received_msg.payload, msg.payload);
+
+            let msg = GossipHandle::build_protocol_message(
+                IdentifierInfo::default(),
+                1,
+                Some(0),
+                &payload,
+                None,
+                None,
+            );
+
+            subnetwork1.send(msg.clone()).unwrap();
+
+            let received_msg = subnetwork0.recv().await.unwrap();
+            assert_eq!(received_msg.payload, msg.payload);
+
+            Box::pin(nested_multiplex(
+                cur_depth + 1,
+                max_depth,
+                subnetwork0,
+                subnetwork1,
+            ))
+            .await
+        }
+
+        nested_multiplex(0, 10, network0, network1).await;
+    }
 }