feat(l2-withdrawals): Define OpEngineApiBuilder (#14426)

crates/optimism/node/src/lib.rs

@@ -23,6 +23,9 @@ pub use engine::OpEngineTypes;
 pub mod node;
 pub use node::{OpNetworkPrimitives, OpNode};
 
+pub mod rpc;
+pub use rpc::OpEngineApiBuilder;
+
 pub use reth_optimism_txpool as txpool;
 
 /// Helpers for running test node instances.

crates/optimism/node/src/node.rs

@@ -4,7 +4,7 @@ use crate::{
     args::RollupArgs,
     engine::OpEngineValidator,
     txpool::{OpTransactionPool, OpTransactionValidator},
-    OpEngineTypes,
+    OpEngineApiBuilder, OpEngineTypes,
 };
 use op_alloy_consensus::OpPooledTransaction;
 use reth_chainspec::{EthChainSpec, Hardforks};
@@ -202,7 +202,12 @@ impl NodeTypesWithEngine for OpNode {
 pub struct OpAddOns<N: FullNodeComponents> {
     /// Rpc add-ons responsible for launching the RPC servers and instantiating the RPC handlers
     /// and eth-api.
-    pub rpc_add_ons: RpcAddOns<N, OpEthApi<N>, OpEngineValidatorBuilder>,
+    pub rpc_add_ons: RpcAddOns<
+        N,
+        OpEthApi<N>,
+        OpEngineValidatorBuilder,
+        OpEngineApiBuilder<OpEngineValidatorBuilder>,
+    >,
     /// Data availability configuration for the OP builder.
     pub da_config: OpDAConfig,
 }

crates/optimism/node/src/rpc.rs

@@ -0,0 +1,40 @@
+//! RPC component builder
+
+pub use reth_optimism_rpc::OpEngineApi;
+
+use reth_chainspec::EthereumHardforks;
+use reth_node_api::{
+    AddOnsContext, EngineTypes, ExecutionData, FullNodeComponents, NodeTypes, NodeTypesWithEngine,
+};
+use reth_node_builder::rpc::{BasicEngineApiBuilder, EngineApiBuilder, EngineValidatorBuilder};
+
+/// Builder for basic [`OpEngineApi`] implementation.
+#[derive(Debug, Default)]
+pub struct OpEngineApiBuilder<EV> {
+    inner: BasicEngineApiBuilder<EV>,
+}
+
+impl<N, EV> EngineApiBuilder<N> for OpEngineApiBuilder<EV>
+where
+    N: FullNodeComponents<
+        Types: NodeTypesWithEngine<
+            ChainSpec: EthereumHardforks,
+            Engine: EngineTypes<ExecutionData = ExecutionData>,
+        >,
+    >,
+    EV: EngineValidatorBuilder<N>,
+{
+    type EngineApi = OpEngineApi<
+        N::Provider,
+        <N::Types as NodeTypesWithEngine>::Engine,
+        N::Pool,
+        EV::Validator,
+        <N::Types as NodeTypes>::ChainSpec,
+    >;
+
+    async fn build_engine_api(self, ctx: &AddOnsContext<'_, N>) -> eyre::Result<Self::EngineApi> {
+        let inner = self.inner.build_engine_api(ctx).await?;
+
+        Ok(OpEngineApi::new(inner))
+    }
+}