From 46d63e8054b63f4fe09978a3850d3f1c02871b49 Mon Sep 17 00:00:00 2001
From: Simon Oswald <git@siosw.net>
Date: Sun, 9 Feb 2025 23:27:07 +0100
Subject: [PATCH] add debug_chainConfig endpoint (#14346)

---
 Cargo.lock                      | 1 +
 crates/rpc/rpc-api/Cargo.toml   | 1 +
 crates/rpc/rpc-api/src/debug.rs | 5 +++++
 crates/rpc/rpc/src/debug.rs     | 7 ++++++-
 4 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index c0fca41c4f50..855ec12868d4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8965,6 +8965,7 @@ name = "reth-rpc-api"
 version = "1.1.5"
 dependencies = [
  "alloy-eips",
+ "alloy-genesis",
  "alloy-json-rpc",
  "alloy-primitives",
  "alloy-rpc-types",
diff --git a/crates/rpc/rpc-api/Cargo.toml b/crates/rpc/rpc-api/Cargo.toml
index abcdf98b5448..4eb9a6e653ce 100644
--- a/crates/rpc/rpc-api/Cargo.toml
+++ b/crates/rpc/rpc-api/Cargo.toml
@@ -32,6 +32,7 @@ alloy-rpc-types-admin.workspace = true
 alloy-serde.workspace = true
 alloy-rpc-types-beacon.workspace = true
 alloy-rpc-types-engine.workspace = true
+alloy-genesis.workspace = true
 
 # misc
 jsonrpsee = { workspace = true, features = ["server", "macros"] }
diff --git a/crates/rpc/rpc-api/src/debug.rs b/crates/rpc/rpc-api/src/debug.rs
index 281e0798fcb7..4b9dc82467c7 100644
--- a/crates/rpc/rpc-api/src/debug.rs
+++ b/crates/rpc/rpc-api/src/debug.rs
@@ -1,4 +1,5 @@
 use alloy_eips::{BlockId, BlockNumberOrTag};
+use alloy_genesis::ChainConfig;
 use alloy_primitives::{Address, Bytes, B256};
 use alloy_rpc_types_debug::ExecutionWitness;
 use alloy_rpc_types_eth::{transaction::TransactionRequest, Block, Bundle, StateContext};
@@ -186,6 +187,10 @@ pub trait DebugApi {
     #[method(name = "chaindbCompact")]
     async fn debug_chaindb_compact(&self) -> RpcResult<()>;
 
+    /// Returns the current chain config.
+    #[method(name = "chainConfig")]
+    async fn debug_chain_config(&self) -> RpcResult<ChainConfig>;
+
     /// Returns leveldb properties of the key-value database.
     #[method(name = "chaindbProperty")]
     async fn debug_chaindb_property(&self, property: String) -> RpcResult<()>;
diff --git a/crates/rpc/rpc/src/debug.rs b/crates/rpc/rpc/src/debug.rs
index e241bf8a4635..b52dca756be0 100644
--- a/crates/rpc/rpc/src/debug.rs
+++ b/crates/rpc/rpc/src/debug.rs
@@ -1,5 +1,6 @@
 use alloy_consensus::BlockHeader;
 use alloy_eips::{eip2718::Encodable2718, BlockId, BlockNumberOrTag};
+use alloy_genesis::ChainConfig;
 use alloy_primitives::{Address, Bytes, B256, U256};
 use alloy_rlp::{Decodable, Encodable};
 use alloy_rpc_types_debug::ExecutionWitness;
@@ -14,7 +15,7 @@ use alloy_rpc_types_trace::geth::{
 };
 use async_trait::async_trait;
 use jsonrpsee::core::RpcResult;
-use reth_chainspec::EthereumHardforks;
+use reth_chainspec::{EthChainSpec, EthereumHardforks};
 use reth_evm::{
     env::EvmEnv,
     execute::{BlockExecutorProvider, Executor},
@@ -1035,6 +1036,10 @@ where
         Ok(())
     }
 
+    async fn debug_chain_config(&self) -> RpcResult<ChainConfig> {
+        Ok(self.provider().chain_spec().genesis().config.clone())
+    }
+
     async fn debug_chaindb_property(&self, _property: String) -> RpcResult<()> {
         Ok(())
     }