Flashblocks Support (#43)

* Add Flashblocks support to RpcWithBlock in executor (#43)

- Introduced a new extension trait `FlashblocksSupport` for `RpcWithBlock` to automatically select the appropriate block tag based on the chain ID.
- Updated the `EoaExecutorWorker` to utilize the new `with_flashblocks_support` method when fetching the transaction count, enhancing compatibility with specific chains.

These changes improve the flexibility and functionality of the RPC provider in handling flashblocks support.

* Remove unused RpcError import in EIP-7702 executor confirm module

Author: d4mr

executors/src/eip7702_executor/confirm.rs

@@ -1,7 +1,6 @@
 use alloy::primitives::TxHash;
 use alloy::providers::Provider;
 use alloy::rpc::types::TransactionReceipt;
-use alloy::transports::RpcError;
 use engine_core::error::{AlloyRpcErrorToEngineError, EngineError};
 use engine_core::rpc_clients::TwGetTransactionHashResponse;
 use engine_core::{

executors/src/eoa/worker/confirm.rs

@@ -2,15 +2,18 @@ use alloy::{primitives::B256, providers::Provider};
 use engine_core::{chain::Chain, error::AlloyRpcErrorToEngineError};
 use serde::{Deserialize, Serialize};
 
-use crate::eoa::{
-    EoaExecutorStore,
-    store::{
-        CleanupReport, ConfirmedTransaction, ReplacedTransaction, SubmittedTransactionDehydrated,
-        TransactionStoreError,
-    },
-    worker::{
-        EoaExecutorWorker,
-        error::{EoaExecutorWorkerError, should_update_balance_threshold},
+use crate::{
+    FlashblocksSupport,
+    eoa::{
+        EoaExecutorStore,
+        store::{
+            CleanupReport, ConfirmedTransaction, ReplacedTransaction, SubmittedTransactionDehydrated,
+            TransactionStoreError,
+        },
+        worker::{
+            EoaExecutorWorker,
+            error::{EoaExecutorWorkerError, should_update_balance_threshold},
+        },
     },
 };
 
@@ -34,6 +37,7 @@ impl<C: Chain> EoaExecutorWorker<C> {
             .chain
             .provider()
             .get_transaction_count(self.eoa)
+            .with_flashblocks_support(self.chain.chain_id())
             .await
             .map_err(|e| {
                 let engine_error = e.to_engine_error(&self.chain);

executors/src/lib.rs

@@ -4,3 +4,24 @@ pub mod external_bundler;
 pub mod metrics;
 pub mod transaction_registry;
 pub mod webhook;
+
+use alloy::rpc::json_rpc::{RpcSend, RpcRecv};
+
+/// Extension trait for RpcWithBlock to automatically select block tag based on flashblocks support
+pub trait FlashblocksSupport {
+    fn with_flashblocks_support(self, chain_id: u64) -> Self;
+}
+
+impl<Params, Resp, Output, Map> FlashblocksSupport for alloy::providers::RpcWithBlock<Params, Resp, Output, Map>
+where
+    Params: RpcSend,
+    Resp: RpcRecv,
+    Map: Fn(Resp) -> Output + Clone,
+{
+    fn with_flashblocks_support(self, chain_id: u64) -> Self {
+        match chain_id {
+            8453 | 84532 => self.pending(), // Base Mainnet | Base Sepolia
+            _ => self,
+        }
+    }
+}