feat: continuous flashblock building

Author: julio4

crates/op-rbuilder/src/args/op.rs

@@ -157,6 +157,14 @@ pub struct FlashblocksArgs {
     )]
     pub flashblocks_calculate_state_root: bool,
 
+    /// Should we calculate state root for each flashblock
+    #[arg(
+        long = "flashblocks.enable-continuous-building",
+        default_value = "true",
+        env = "FLASHBLOCKS_ENABLE_CONTINUOUS_BUILDING"
+    )]
+    pub flashblocks_enable_continuous_building: bool,
+
     /// Flashblocks number contract address
     ///
     /// This is the address of the contract that will be used to increment the flashblock number.

crates/op-rbuilder/src/builders/context.rs

@@ -1,3 +1,4 @@
+use alloy_consensus::transaction::TxHashRef;
 use alloy_consensus::{Eip658Value, Transaction, conditional::BlockConditionalAttributes};
 use alloy_eips::Typed2718;
 use alloy_evm::Database;
@@ -326,10 +327,11 @@ impl<ExtraCtx: Debug + Default> OpPayloadBuilderCtx<ExtraCtx> {
         Ok(info)
     }
 
-    /// Executes the given best transactions and updates the execution info.
+    /// Simulates the given best transactions.
+    /// The simulation updates the execution info and commit changes to the db
     ///
     /// Returns `Ok(Some(())` if the job was cancelled.
-    pub(super) fn execute_best_transactions<E: Debug + Default>(
+    pub(super) fn simulate_best_transactions<E: Debug + Default>(
         &self,
         info: &mut ExecutionInfo<E>,
         db: &mut State<impl Database>,

crates/op-rbuilder/src/builders/flashblocks/config.rs

@@ -34,6 +34,9 @@ pub struct FlashblocksConfig {
     /// Should we calculate state root for each flashblock
     pub calculate_state_root: bool,
 
+    /// Whether to enable continuous flashblock building or not
+    pub enable_continuous_building: bool,
+
     /// The address of the flashblocks number contract.
     ///
     /// If set a builder tx will be added to the start of every flashblock instead of the regular builder tx.
@@ -63,6 +66,7 @@ impl Default for FlashblocksConfig {
             leeway_time: Duration::from_millis(50),
             fixed: false,
             calculate_state_root: true,
+            enable_continuous_building: true,
             flashblocks_number_contract_address: None,
             p2p_enabled: false,
             p2p_port: 9009,
@@ -90,6 +94,8 @@ impl TryFrom<OpRbuilderArgs> for FlashblocksConfig {
 
         let calculate_state_root = args.flashblocks.flashblocks_calculate_state_root;
 
+        let enable_continuous_building = args.flashblocks.flashblocks_enable_continuous_building;
+
         let flashblocks_number_contract_address =
             args.flashblocks.flashblocks_number_contract_address;
 
@@ -99,6 +105,7 @@ impl TryFrom<OpRbuilderArgs> for FlashblocksConfig {
             leeway_time,
             fixed,
             calculate_state_root,
+            enable_continuous_building,
             flashblocks_number_contract_address,
             p2p_enabled: args.flashblocks.p2p.p2p_enabled,
             p2p_port: args.flashblocks.p2p.p2p_port,