fix: make block query cutoff properly configurable

Author: dylanlott

src/config.rs

@@ -155,6 +155,14 @@ pub struct BuilderConfig {
     )]
     pub max_host_gas_coefficient: Option<u8>,
 
+    /// Number of seconds before the end of the slot to stop querying for new blocks
+    #[from_env(
+        var ="BLOCK_QUERY_CUTOFF_SECS",
+        desc = "Number of seconds before the end of the slot to stop querying for new blocks",
+        default = 2
+    )]
+    pub block_query_cutoff_secs: u64,
+
     /// The slot calculator for the builder.
     pub slot_calculator: SlotCalculator,
 

src/tasks/block/sim.rs

@@ -253,7 +253,7 @@ impl Simulator {
         // We have the timepoint in seconds into the slot. To find out what's
         // remaining, we need to subtract it from the slot duration
         // we also subtract 3 seconds to account for the sequencer stopping signing.
-        let remaining = (self.slot_calculator().slot_duration() - timepoint).saturating_sub(3);
+        let remaining = (self.slot_calculator().slot_duration() - timepoint).saturating_sub(self.config.block_query_cutoff_secs);
 
         let deadline = Instant::now() + Duration::from_secs(remaining);
         deadline.max(Instant::now())

src/test_utils.rs

@@ -53,6 +53,7 @@ pub fn setup_test_config() -> Result<BuilderConfig> {
             1740681556, // pecorino start timestamp as sane default
             0, 1,
         ),
+        block_query_cutoff_secs: 2,
         max_host_gas_coefficient: Some(80),
         constants: SignetSystemConstants::pecorino(),
     };