passes sim result to the submit tasks

- adds a SimResult type that binds a BlockEnv to a BuiltBlock
- passess that SimResult to the SubmitTask for gas calculations

Author: dylanlott

src/tasks/block/sim.rs

@@ -39,6 +39,15 @@ pub struct Simulator {
     pub block_env: watch::Receiver<Option<BlockEnv>>,
 }
 
+/// SimResult bundles a BuiltBlock to the BlockEnv it was simulated against.
+#[derive(Debug, Clone)]
+pub struct SimResult {
+    /// The block built with the successfully simulated transactions
+    pub block: BuiltBlock,
+    /// The block environment the transactions were simulated against.
+    pub env: BlockEnv,
+}
+
 impl Simulator {
     /// Creates a new `Simulator` instance.
     ///
@@ -115,7 +124,7 @@ impl Simulator {
         self,
         constants: SignetSystemConstants,
         cache: SimCache,
-        submit_sender: mpsc::UnboundedSender<BuiltBlock>,
+        submit_sender: mpsc::UnboundedSender<SimResult>,
     ) -> JoinHandle<()> {
         debug!("starting simulator task");
 
@@ -140,7 +149,7 @@ impl Simulator {
         mut self,
         constants: SignetSystemConstants,
         cache: SimCache,
-        submit_sender: mpsc::UnboundedSender<BuiltBlock>,
+        submit_sender: mpsc::UnboundedSender<SimResult>,
     ) {
         loop {
             let sim_cache = cache.clone();
@@ -156,10 +165,10 @@ impl Simulator {
             let Some(block_env) = self.block_env.borrow_and_update().clone() else { return };
             debug!(block_env = ?block_env, "building on block env");
 
-            match self.handle_build(constants, sim_cache, finish_by, block_env).await {
+            match self.handle_build(constants, sim_cache, finish_by, block_env.clone()).await {
                 Ok(block) => {
-                    debug!(block = ?block, "built block");
-                    let _ = submit_sender.send(block);
+                    debug!(block = ?block.block_number(), "built block");
+                    let _ = submit_sender.send(SimResult { block, env: block_env });
                 }
                 Err(e) => {
                     error!(err = %e, "failed to build block");

src/tasks/submit.rs

@@ -25,14 +25,13 @@ use signet_zenith::{
     Zenith::{self, IncorrectHostBlock},
 };
 use std::time::{Instant, UNIX_EPOCH};
-use tokio::{sync::mpsc, task::JoinHandle};
+use tokio::{
+    sync::mpsc::{self},
+    task::JoinHandle,
+};
+use trevm::revm::context::BlockEnv;
 
-/// Base maximum fee per gas to use as a starting point for retry bumps
-pub const BASE_FEE_PER_GAS: u128 = 10 * GWEI_TO_WEI as u128;
-/// Base max priority fee per gas to use as a starting point for retry bumps
-pub const BASE_MAX_PRIORITY_FEE_PER_GAS: u128 = 2 * GWEI_TO_WEI as u128;
-/// Base maximum fee per blob gas to use as a starting point for retry bumps
-pub const BASE_MAX_FEE_PER_BLOB_GAS: u128 = GWEI_TO_WEI as u128;
+use super::block::sim::SimResult;
 
 macro_rules! spawn_provider_send {
     ($provider:expr, $tx:expr) => {
@@ -222,7 +221,7 @@ impl SubmitTask {
         })
     }
 
-    /// Builds blob transaction and encodes the sidecar for it from the provided header and signature values
+    /// Encodes the sidecar and then builds the 4844 blob transaction from the provided header and signature values.
     fn build_blob_tx(
         &self,
         fills: Vec<FillPermit2>,
@@ -245,8 +244,9 @@ impl SubmitTask {
         retry_count: usize,
         resp: &SignResponse,
         block: &BuiltBlock,
+        block_env: &BlockEnv,
     ) -> eyre::Result<ControlFlow> {
-        let tx = self.prepare_tx(retry_count, resp, block).await?;
+        let tx = self.prepare_tx(retry_count, resp, block, block_env).await?;
 
         self.send_transaction(resp, tx).await
     }
@@ -258,9 +258,11 @@ impl SubmitTask {
         retry_count: usize,
         resp: &SignResponse,
         block: &BuiltBlock,
+        block_env: &BlockEnv,
     ) -> Result<TransactionRequest, eyre::Error> {
         // Create the transaction request with the signature values
-        let tx: TransactionRequest = self.new_tx_request(retry_count, resp, block).await?;
+        let tx: TransactionRequest =
+            self.new_tx_request(retry_count, resp, block, block_env).await?;
 
         // Simulate the transaction with a call to the host provider and report any errors
         if let Err(err) = self.sim_with_call(&tx).await {
@@ -288,6 +290,7 @@ impl SubmitTask {
         retry_count: usize,
         resp: &SignResponse,
         block: &BuiltBlock,
+        block_env: &BlockEnv,
     ) -> Result<TransactionRequest, eyre::Error> {
         // manually retrieve nonce
         let nonce =
@@ -297,14 +300,8 @@ impl SubmitTask {
         // Extract the signature components from the response
         let (v, r, s) = extract_signature_components(&resp.sig);
 
-        // Calculate gas limits based on retry attempts
         let (max_fee_per_gas, max_priority_fee_per_gas, max_fee_per_blob_gas) =
-            calculate_gas_limits(
-                retry_count,
-                BASE_FEE_PER_GAS,
-                BASE_MAX_PRIORITY_FEE_PER_GAS,
-                BASE_MAX_FEE_PER_BLOB_GAS,
-            );
+            calculate_gas(retry_count, block_env);
 
         // Build the block header
         let header: BlockHeader = BlockHeader {
@@ -386,6 +383,7 @@ impl SubmitTask {
         &self,
         retry_count: usize,
         block: &BuiltBlock,
+        block_env: &BlockEnv,
     ) -> eyre::Result<ControlFlow> {
         info!(retry_count, txns = block.tx_count(), "handling inbound block");
         let Ok(sig_request) = self.construct_sig_request(block).await.inspect_err(|e| {
@@ -402,13 +400,14 @@ impl SubmitTask {
 
         let signed = self.quincey.get_signature(&sig_request).await?;
 
-        self.submit_transaction(retry_count, &signed, block).await
+        self.submit_transaction(retry_count, &signed, block, block_env).await
     }
 
     /// Handles the retry logic for the inbound block.
     async fn retrying_handle_inbound(
         &self,
         block: &BuiltBlock,
+        block_env: &BlockEnv,
         retry_limit: usize,
     ) -> eyre::Result<ControlFlow> {
         let mut retries = 0;
@@ -422,7 +421,8 @@ impl SubmitTask {
             let span = debug_span!("SubmitTask::retrying_handle_inbound", retries);
 
             let inbound_result =
-                match self.handle_inbound(retries, block).instrument(span.clone()).await {
+                match self.handle_inbound(retries, block, block_env).instrument(span.clone()).await
+                {
                     Ok(control_flow) => control_flow,
                     Err(err) => {
                         // Delay until next slot if we get a 403 error
@@ -500,66 +500,86 @@ impl SubmitTask {
     /// Task future for the submit task
     /// NB: This task assumes that the simulator will only send it blocks for
     /// slots that it's assigned.
-    async fn task_future(self, mut inbound: mpsc::UnboundedReceiver<BuiltBlock>) {
+    async fn task_future(self, mut inbound: mpsc::UnboundedReceiver<SimResult>) {
         // Holds a reference to the last block we attempted to submit
         let mut last_block_attempted: u64 = 0;
 
         loop {
             // Wait to receive a new block
-            let Some(block) = inbound.recv().await else {
+            let Some(result) = inbound.recv().await else {
                 debug!("upstream task gone");
                 break;
             };
-            debug!(block_number = block.block_number(), ?block, "submit channel received block");
+
+            debug!(block_number = result.block.block_number(), "submit channel received block");
 
             // Only attempt each block number once
-            if block.block_number() == last_block_attempted {
+            if result.block.block_number() == last_block_attempted {
                 debug!("block number is unchanged from last attempt - skipping");
                 continue;
             }
 
             // This means we have encountered a new block, so reset the last block attempted
-            last_block_attempted = block.block_number();
+            last_block_attempted = result.block.block_number();
             debug!(last_block_attempted, "resetting last block attempted");
 
-            if self.retrying_handle_inbound(&block, 3).await.is_err() {
+            if self.retrying_handle_inbound(&result.block, &result.env, 3).await.is_err() {
                 debug!("error handling inbound block");
                 continue;
             };
         }
     }
 
     /// Spawns the in progress block building task
-    pub fn spawn(self) -> (mpsc::UnboundedSender<BuiltBlock>, JoinHandle<()>) {
-        let (sender, inbound) = mpsc::unbounded_channel();
+    pub fn spawn(self) -> (mpsc::UnboundedSender<SimResult>, JoinHandle<()>) {
+        let (sender, inbound) = mpsc::unbounded_channel::<SimResult>();
         let handle = tokio::spawn(self.task_future(inbound));
 
         (sender, handle)
     }
 }
 
-// Returns gas parameters based on retry counts.
-fn calculate_gas_limits(
+/// Calculates gas parameters based on the block environment and retry count.
+fn calculate_gas(retry_count: usize, block_env: &BlockEnv) -> (u128, u128, u128) {
+    if let Some(blob_excess) = block_env.blob_excess_gas_and_price {
+        debug!(?blob_excess, "using blob excess gas and price from block env");
+        let blob_basefee = blob_excess.blob_gasprice;
+
+        let (max_fee_per_gas, max_priority_fee_per_gas, max_fee_per_blob_gas) =
+            bump_gas_from_retries(retry_count, block_env.basefee, blob_basefee);
+
+        (max_fee_per_gas as u128, max_priority_fee_per_gas as u128, max_fee_per_blob_gas as u128)
+    } else {
+        warn!("no blob excess gas and price in block env, using defaults");
+        let (max_fee_per_gas, max_priority_fee_per_gas, max_fee_per_blob_gas) =
+            bump_gas_from_retries(retry_count, block_env.basefee, 500);
+
+        (max_fee_per_gas as u128, max_priority_fee_per_gas as u128, max_fee_per_blob_gas)
+    }
+}
+
+/// Bumps the gas parameters based on the retry count, base fee, and blob base fee.
+pub fn bump_gas_from_retries(
     retry_count: usize,
-    base_max_fee_per_gas: u128,
-    base_max_priority_fee_per_gas: u128,
-    base_max_fee_per_blob_gas: u128,
-) -> (u128, u128, u128) {
-    let bump_multiplier = 1150u128.pow(retry_count as u32); // 15% bump
-    let blob_bump_multiplier = 2000u128.pow(retry_count as u32); // 100% bump (double each time) for blob gas
-    let bump_divisor = 1000u128.pow(retry_count as u32);
-
-    let max_fee_per_gas = base_max_fee_per_gas * bump_multiplier / bump_divisor;
-    let max_priority_fee_per_gas = base_max_priority_fee_per_gas * bump_multiplier / bump_divisor;
-    let max_fee_per_blob_gas = base_max_fee_per_blob_gas * blob_bump_multiplier / bump_divisor;
+    basefee: u64,
+    blob_basefee: u128,
+) -> (u64, u64, u128) {
+    const PRIORITY_FEE_BASE: u64 = 2 * GWEI_TO_WEI;
+    const BASE_MULTIPLIER: u64 = 2;
+    const BLOB_MULTIPLIER: u128 = 2;
+
+    // Increase priority fee by 20% per retry
+    let priority_fee =
+        PRIORITY_FEE_BASE * (12u64.pow(retry_count as u32) / 10u64.pow(retry_count as u32));
+
+    // Max fee includes basefee + priority + headroom (double basefee, etc.)
+    let max_fee_per_gas = basefee * BASE_MULTIPLIER + priority_fee;
+    let max_fee_per_blob_gas = blob_basefee * BLOB_MULTIPLIER * (retry_count as u128 + 1);
 
     debug!(
         retry_count,
-        max_fee_per_gas,
-        max_priority_fee_per_gas,
-        max_fee_per_blob_gas,
-        "calculated bumped gas parameters"
+        max_fee_per_gas, priority_fee, max_fee_per_blob_gas, "calculated bumped gas parameters"
     );
 
-    (max_fee_per_gas, max_priority_fee_per_gas, max_fee_per_blob_gas)
+    (max_fee_per_gas, priority_fee, max_fee_per_blob_gas)
 }

tests/block_builder_test.rs

@@ -126,5 +126,5 @@ async fn test_spawn() {
     // Assert on the block
     let block = result.unwrap();
     assert!(block.is_some(), "Block channel closed without receiving a block");
-    assert!(block.unwrap().tx_count() == 2); // TODO: Why is this failing? I'm seeing EVM errors but haven't tracked them down yet.
+    assert!(block.unwrap().block.tx_count() == 2); // TODO: Why is this failing? I'm seeing EVM errors but haven't tracked them down yet.
 }