feat: add op debug witness api (#12583)

Co-authored-by: Federico Gimenez <fgimenez@users.noreply.github.com>

crates/optimism/rpc/Cargo.toml

@@ -22,6 +22,7 @@ reth-rpc-server-types.workspace = true
 reth-tasks = { workspace = true, features = ["rayon"] }
 reth-transaction-pool.workspace = true
 reth-rpc.workspace = true
+reth-rpc-api.workspace = true
 reth-node-api.workspace = true
 reth-network-api.workspace = true
 reth-node-builder.workspace = true
@@ -31,15 +32,18 @@ reth-chainspec.workspace = true
 reth-optimism-chainspec.workspace = true
 reth-optimism-consensus.workspace = true
 reth-optimism-evm.workspace = true
+reth-optimism-payload-builder.workspace = true
 reth-optimism-forks.workspace = true
 
 # ethereum
 alloy-eips.workspace = true
 alloy-primitives.workspace = true
 alloy-rpc-types-eth.workspace = true
+alloy-rpc-types-debug.workspace = true
 alloy-consensus.workspace = true
 op-alloy-network.workspace = true
 op-alloy-rpc-types.workspace = true
+op-alloy-rpc-types-engine.workspace = true
 op-alloy-consensus.workspace = true
 revm.workspace = true
 
@@ -49,6 +53,7 @@ tokio.workspace = true
 reqwest = { workspace = true, features = ["rustls-tls-native-roots"] }
 
 # rpc
+jsonrpsee-core.workspace = true
 jsonrpsee-types.workspace = true
 serde_json.workspace = true
 
@@ -66,5 +71,6 @@ optimism = [
 	"reth-primitives/optimism",
 	"reth-provider/optimism",
 	"revm/optimism",
-	"reth-optimism-consensus/optimism"
+	"reth-optimism-consensus/optimism",
+	"reth-optimism-payload-builder/optimism"
 ]

crates/optimism/rpc/src/lib.rs

@@ -13,6 +13,7 @@
 pub mod error;
 pub mod eth;
 pub mod sequencer;
+pub mod witness;
 
 pub use error::{OpEthApiError, OpInvalidTransactionError, SequencerClientError};
 pub use eth::{OpEthApi, OpReceiptBuilder};

crates/optimism/rpc/src/witness.rs

@@ -0,0 +1,81 @@
+//! Support for optimism specific witness RPCs.
+
+use alloy_consensus::Header;
+use alloy_primitives::B256;
+use alloy_rpc_types_debug::ExecutionWitness;
+use jsonrpsee_core::RpcResult;
+use op_alloy_rpc_types_engine::OpPayloadAttributes;
+use reth_chainspec::ChainSpecProvider;
+use reth_evm::ConfigureEvm;
+use reth_optimism_chainspec::OpChainSpec;
+use reth_optimism_payload_builder::OpPayloadBuilder;
+use reth_primitives::SealedHeader;
+use reth_provider::{BlockReaderIdExt, ProviderError, ProviderResult, StateProviderFactory};
+use reth_rpc_api::DebugExecutionWitnessApiServer;
+use reth_rpc_server_types::{result::internal_rpc_err, ToRpcResult};
+use std::{fmt::Debug, sync::Arc};
+
+/// An extension to the `debug_` namespace of the RPC API.
+pub struct OpDebugWitnessApi<Provider, EvmConfig> {
+    inner: Arc<OpDebugWitnessApiInner<Provider, EvmConfig>>,
+}
+
+impl<Provider, EvmConfig> OpDebugWitnessApi<Provider, EvmConfig> {
+    /// Creates a new instance of the `OpDebugWitnessApi`.
+    pub fn new(provider: Provider, evm_config: EvmConfig) -> Self {
+        let builder = OpPayloadBuilder::new(evm_config);
+        let inner = OpDebugWitnessApiInner { provider, builder };
+        Self { inner: Arc::new(inner) }
+    }
+}
+
+impl<Provider, EvmConfig> OpDebugWitnessApi<Provider, EvmConfig>
+where
+    Provider: BlockReaderIdExt,
+{
+    /// Fetches the parent header by hash.
+    fn parent_header(&self, parent_block_hash: B256) -> ProviderResult<SealedHeader> {
+        self.inner
+            .provider
+            .sealed_header_by_hash(parent_block_hash)?
+            .ok_or_else(|| ProviderError::HeaderNotFound(parent_block_hash.into()))
+    }
+}
+
+impl<Provider, EvmConfig> DebugExecutionWitnessApiServer<OpPayloadAttributes>
+    for OpDebugWitnessApi<Provider, EvmConfig>
+where
+    Provider: BlockReaderIdExt
+        + StateProviderFactory
+        + ChainSpecProvider<ChainSpec = OpChainSpec>
+        + 'static,
+    EvmConfig: ConfigureEvm<Header = Header> + 'static,
+{
+    fn execute_payload(
+        &self,
+        parent_block_hash: B256,
+        attributes: OpPayloadAttributes,
+    ) -> RpcResult<ExecutionWitness> {
+        let parent_header = self.parent_header(parent_block_hash).to_rpc_result()?;
+        self.inner
+            .builder
+            .payload_witness(&self.inner.provider, parent_header, attributes)
+            .map_err(|err| internal_rpc_err(err.to_string()))
+    }
+}
+
+impl<Provider, EvmConfig> Clone for OpDebugWitnessApi<Provider, EvmConfig> {
+    fn clone(&self) -> Self {
+        Self { inner: Arc::clone(&self.inner) }
+    }
+}
+impl<Provider, EvmConfig> Debug for OpDebugWitnessApi<Provider, EvmConfig> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("OpDebugWitnessApi").finish_non_exhaustive()
+    }
+}
+
+struct OpDebugWitnessApiInner<Provider, EvmConfig> {
+    provider: Provider,
+    builder: OpPayloadBuilder<EvmConfig>,
+}

crates/rpc/rpc-api/src/debug.rs

@@ -399,10 +399,10 @@ pub trait DebugExecutionWitnessApi<Attributes> {
     /// hashed trie nodes to their preimages that were required during the execution of the block,
     /// including during state root recomputation.
     ///
-    /// The first argument is the block number or block hash. The second argument is the payload
-    /// attributes for the new block. The third argument is a list of transactions to be included.
-    #[method(name = "executePayload")]
-    async fn execute_payload(
+    /// The first argument is the parent block hash. The second argument is the payload
+    /// attributes for the new block.
+    #[method(name = "executePayload", blocking)]
+    fn execute_payload(
         &self,
         parent_block_hash: B256,
         attributes: Attributes,