feat: add getL1MessageByIndex rpc method

crates/chain-orchestrator/Cargo.toml

@@ -117,4 +117,5 @@ serde = [
     "scroll-alloy-hardforks/serde",
     "scroll-engine/serde",
     "scroll-network/serde",
+    "rollup-node-primitives/serde",
 ]

crates/chain-orchestrator/src/handle/command.rs

@@ -3,7 +3,7 @@ use crate::{ChainOrchestratorEvent, ChainOrchestratorStatus};
 use reth_network_api::FullNetwork;
 use reth_scroll_node::ScrollNetworkPrimitives;
 use reth_tokio_util::EventStream;
-use rollup_node_primitives::BlockInfo;
+use rollup_node_primitives::{BlockInfo, L1MessageEnvelope};
 use scroll_network::ScrollNetworkHandle;
 use tokio::sync::oneshot;
 
@@ -24,7 +24,16 @@ pub enum ChainOrchestratorCommand<N: FullNetwork<Primitives = ScrollNetworkPrimi
     EnableAutomaticSequencing(oneshot::Sender<bool>),
     /// Disable automatic sequencing.
     DisableAutomaticSequencing(oneshot::Sender<bool>),
+    /// Send a database query to the rollup manager.
+    DatabaseQuery(DatabaseQuery),
     /// Enable gossiping of blocks to peers.
     #[cfg(feature = "test-utils")]
     SetGossip((bool, oneshot::Sender<()>)),
 }
+
+/// The database queries that can be sent to the rollup manager.
+#[derive(Debug)]
+pub enum DatabaseQuery {
+    /// Get L1 message by its index.
+    GetL1MessageByIndex(u64, oneshot::Sender<Option<L1MessageEnvelope>>),
+}

crates/chain-orchestrator/src/handle/mod.rs

@@ -5,13 +5,13 @@ use super::ChainOrchestratorEvent;
 use reth_network_api::FullNetwork;
 use reth_scroll_node::ScrollNetworkPrimitives;
 use reth_tokio_util::EventStream;
-use rollup_node_primitives::BlockInfo;
+use rollup_node_primitives::{BlockInfo, L1MessageEnvelope};
 use scroll_network::ScrollNetworkHandle;
 use tokio::sync::{mpsc, oneshot};
 use tracing::error;
 
 mod command;
-pub use command::ChainOrchestratorCommand;
+pub use command::{ChainOrchestratorCommand, DatabaseQuery};
 
 mod metrics;
 use metrics::ChainOrchestratorHandleMetrics;
@@ -90,6 +90,18 @@ impl<N: FullNetwork<Primitives = ScrollNetworkPrimitives>> ChainOrchestratorHand
         rx.await
     }
 
+    /// Get an L1 message by its index.
+    pub async fn get_l1_message_by_index(
+        &self,
+        index: u64,
+    ) -> Result<Option<L1MessageEnvelope>, oneshot::error::RecvError> {
+        let (tx, rx) = oneshot::channel();
+        self.send_command(ChainOrchestratorCommand::DatabaseQuery(
+            DatabaseQuery::GetL1MessageByIndex(index, tx),
+        ));
+        rx.await
+    }
+
     /// Sends a command to the rollup manager to enable or disable gossiping of blocks to peers.
     #[cfg(feature = "test-utils")]
     pub async fn set_gossip(&self, enabled: bool) -> Result<(), oneshot::error::RecvError> {

crates/chain-orchestrator/src/lib.rs

@@ -59,7 +59,7 @@ mod error;
 pub use error::ChainOrchestratorError;
 
 mod handle;
-pub use handle::{ChainOrchestratorCommand, ChainOrchestratorHandle};
+pub use handle::{ChainOrchestratorCommand, ChainOrchestratorHandle, DatabaseQuery};
 
 mod metrics;
 pub use metrics::{ChainOrchestratorItem, ChainOrchestratorMetrics};
@@ -376,6 +376,16 @@ impl<
                     let _ = tx.send(false);
                 }
             }
+            ChainOrchestratorCommand::DatabaseQuery(query) => match query {
+                DatabaseQuery::GetL1MessageByIndex(index, sender) => {
+                    let l1_message = self
+                        .database
+                        .get_n_l1_messages(Some(L1MessageKey::from_queue_index(index)), 1)
+                        .await?
+                        .pop();
+                    let _ = sender.send(l1_message);
+                }
+            },
             #[cfg(feature = "test-utils")]
             ChainOrchestratorCommand::SetGossip((enabled, tx)) => {
                 self.network.handle().set_gossip(enabled).await;

crates/engine/Cargo.toml

@@ -75,4 +75,5 @@ serde = [
     "reth-primitives-traits/serde",
     "alloy-consensus/serde",
     "scroll-alloy-consensus/serde",
+    "rollup-node-primitives/serde",
 ]

crates/network/Cargo.toml

@@ -50,6 +50,7 @@ serde = [
     "reth-primitives-traits/serde",
     "reth-storage-api/serde",
     "scroll-alloy-hardforks/serde",
+    "rollup-node-primitives/serde",
 ]
 test-utils = [
     "reth-chainspec/test-utils",

crates/node/src/add_ons/rpc.rs

@@ -7,6 +7,7 @@ use jsonrpsee::{
 use reth_network_api::FullNetwork;
 use reth_scroll_node::ScrollNetworkPrimitives;
 use rollup_node_chain_orchestrator::{ChainOrchestratorHandle, ChainOrchestratorStatus};
+use rollup_node_primitives::L1MessageEnvelope;
 use tokio::sync::{oneshot, Mutex, OnceCell};
 
 /// RPC extension for rollup node management operations.
@@ -79,6 +80,10 @@ pub trait RollupNodeExtApi {
     /// Returns the current status of the rollup node.
     #[method(name = "status")]
     async fn status(&self) -> RpcResult<ChainOrchestratorStatus>;
+
+    /// Returns the L1 message by index.
+    #[method(name = "getL1MessageByIndex")]
+    async fn get_l1_message_by_index(&self, index: u64) -> RpcResult<Option<L1MessageEnvelope>>;
 }
 
 #[async_trait]
@@ -139,4 +144,22 @@ where
             )
         })
     }
+
+    async fn get_l1_message_by_index(&self, index: u64) -> RpcResult<Option<L1MessageEnvelope>> {
+        let handle = self.rollup_manager_handle().await.map_err(|e| {
+            ErrorObjectOwned::owned(
+                error::INTERNAL_ERROR_CODE,
+                format!("Failed to get rollup manager handle: {}", e),
+                None::<()>,
+            )
+        })?;
+
+        handle.get_l1_message_by_index(index).await.map_err(|e| {
+            ErrorObjectOwned::owned(
+                error::INTERNAL_ERROR_CODE,
+                format!("Failed to get L1 message by index: {}", e),
+                None::<()>,
+            )
+        })
+    }
 }

crates/primitives/Cargo.toml

@@ -67,3 +67,14 @@ arbitrary = [
     "alloy-chains/arbitrary",
     "reth-chainspec/arbitrary",
 ]
+serde = [
+    "alloy-chains/serde",
+    "alloy-consensus/serde",
+    "alloy-eips/serde",
+    "alloy-primitives/serde",
+    "alloy-rpc-types-engine/serde",
+    "reth-primitives-traits/serde",
+    "reth-scroll-primitives/serde",
+    "scroll-alloy-consensus/serde",
+    "scroll-alloy-rpc-types-engine/serde",
+]

crates/primitives/src/transaction.rs

@@ -3,6 +3,7 @@ use scroll_alloy_consensus::TxL1Message;
 
 /// A L1 message envelope, containing extra information about the message.
 #[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct L1MessageEnvelope {
     /// The L1 transaction.
     pub transaction: TxL1Message,