From 247be8c6aa1d473226edae465a5f37286ee9d46d Mon Sep 17 00:00:00 2001
From: Matthias Seitz <matthias.seitz@outlook.de>
Date: Mon, 5 Aug 2024 12:22:04 +0200
Subject: [PATCH] feat: add api bindings for eth_simulateV1 (#10050)

---
 crates/rpc/rpc-eth-api/src/core.rs         | 29 ++++++++++++++++++----
 crates/rpc/rpc-eth-api/src/helpers/call.rs | 16 ++++++++++--
 2 files changed, 38 insertions(+), 7 deletions(-)

diff --git a/crates/rpc/rpc-eth-api/src/core.rs b/crates/rpc/rpc-eth-api/src/core.rs
index 4f90e1686e..ba9d75fa29 100644
--- a/crates/rpc/rpc-eth-api/src/core.rs
+++ b/crates/rpc/rpc-eth-api/src/core.rs
@@ -1,6 +1,10 @@
 //! Implementation of the [`jsonrpsee`] generated [`EthApiServer`] trait. Handles RPC requests for
 //! the `eth_` namespace.
 
+use crate::helpers::{
+    transaction::UpdateRawTxForwarder, EthApiSpec, EthBlocks, EthCall, EthFees, EthState,
+    EthTransactions, FullEthApi,
+};
 use alloy_dyn_abi::TypedData;
 use jsonrpsee::{core::RpcResult, proc_macros::rpc};
 use reth_primitives::{
@@ -9,6 +13,7 @@ use reth_primitives::{
 use reth_rpc_server_types::{result::internal_rpc_err, ToRpcResult};
 use reth_rpc_types::{
     serde_helpers::JsonStorageKey,
+    simulate::{SimBlock, SimulatedBlock},
     state::{EvmOverrides, StateOverride},
     AnyTransactionReceipt, BlockOverrides, Bundle, EIP1186AccountProofResponse, EthCallResponse,
     FeeHistory, Header, Index, RichBlock, StateContext, SyncStatus, Transaction,
@@ -16,11 +21,6 @@ use reth_rpc_types::{
 };
 use tracing::trace;
 
-use crate::helpers::{
-    transaction::UpdateRawTxForwarder, EthApiSpec, EthBlocks, EthCall, EthFees, EthState,
-    EthTransactions, FullEthApi,
-};
-
 /// Helper trait, unifies functionality that must be supported to implement all RPC methods for
 /// server.
 pub trait FullEthApiServer: EthApiServer + FullEthApi + UpdateRawTxForwarder + Clone {}
@@ -192,6 +192,15 @@ pub trait EthApi {
     #[method(name = "getHeaderByHash")]
     async fn header_by_hash(&self, hash: B256) -> RpcResult<Option<Header>>;
 
+    /// `eth_simulateV1` executes an arbitrary number of transactions on top of the requested state.
+    /// The transactions are packed into individual blocks. Overrides can be provided.
+    #[method(name = "simulateV1")]
+    async fn simulate_v1(
+        &self,
+        opts: SimBlock,
+        block_number: Option<BlockId>,
+    ) -> RpcResult<Vec<SimulatedBlock>>;
+
     /// Executes a new message call immediately without creating a transaction on the block chain.
     #[method(name = "call")]
     async fn call(
@@ -566,6 +575,16 @@ where
         Ok(EthBlocks::rpc_block_header(self, hash.into()).await?)
     }
 
+    /// Handler for: `eth_simulateV1`
+    async fn simulate_v1(
+        &self,
+        opts: SimBlock,
+        block_number: Option<BlockId>,
+    ) -> RpcResult<Vec<SimulatedBlock>> {
+        trace!(target: "rpc::eth", ?block_number, "Serving eth_simulateV1");
+        Ok(EthCall::simulate_v1(self, opts, block_number).await?)
+    }
+
     /// Handler for: `eth_call`
     async fn call(
         &self,
diff --git a/crates/rpc/rpc-eth-api/src/helpers/call.rs b/crates/rpc/rpc-eth-api/src/helpers/call.rs
index 9280154b8f..5ed42ec1ec 100644
--- a/crates/rpc/rpc-eth-api/src/helpers/call.rs
+++ b/crates/rpc/rpc-eth-api/src/helpers/call.rs
@@ -1,6 +1,7 @@
 //! Loads a pending block from database. Helper trait for `eth_` transaction, call and trace RPC
 //! methods.
 
+use crate::{AsEthApiError, FromEthApiError, FromEvmError, IntoEthApiError};
 use futures::Future;
 use reth_evm::{ConfigureEvm, ConfigureEvmEnv};
 use reth_primitives::{
@@ -26,6 +27,7 @@ use reth_rpc_server_types::constants::gas_oracle::{
     CALL_STIPEND_GAS, ESTIMATE_GAS_ERROR_RATIO, MIN_TRANSACTION_GAS,
 };
 use reth_rpc_types::{
+    simulate::{SimBlock, SimulatedBlock},
     state::{EvmOverrides, StateOverride},
     BlockId, Bundle, EthCallResponse, StateContext, TransactionInfo, TransactionRequest,
 };
@@ -33,8 +35,6 @@ use revm::{Database, DatabaseCommit};
 use revm_inspectors::access_list::AccessListInspector;
 use tracing::trace;
 
-use crate::{AsEthApiError, FromEthApiError, FromEvmError, IntoEthApiError};
-
 use super::{LoadBlock, LoadPendingBlock, LoadState, LoadTransaction, SpawnBlocking, Trace};
 
 /// Execution related functions for the [`EthApiServer`](crate::EthApiServer) trait in
@@ -50,6 +50,18 @@ pub trait EthCall: Call + LoadPendingBlock {
         Call::estimate_gas_at(self, request, at, state_override)
     }
 
+    /// `eth_simulateV1` executes an arbitrary number of transactions on top of the requested state.
+    /// The transactions are packed into individual blocks. Overrides can be provided.
+    ///
+    /// See also: <https://github.com/ethereum/go-ethereum/pull/27720>
+    fn simulate_v1(
+        &self,
+        _opts: SimBlock,
+        _block_number: Option<BlockId>,
+    ) -> impl Future<Output = Result<Vec<SimulatedBlock>, Self::Error>> + Send {
+        async move { Err(EthApiError::Unsupported("eth_simulateV1 is not supported.").into()) }
+    }
+
     /// Executes the call request (`eth_call`) and returns the output
     fn call(
         &self,