Add block number to log (#2047)

# Description
Print block number for each failure or success of the simulation.

crates/driver/src/domain/competition/solution/settlement.rs

@@ -241,10 +241,10 @@ impl Settlement {
         let tx = tx.set_access_list(access_list.clone());
 
         // Simulate the settlement using the full access list and get the gas used.
-        let gas = simulator.gas(tx.clone()).await?;
+        let gas = simulator.gas(tx.clone()).await;
 
-        observe::simulated(&tx, gas);
-        Ok((access_list, gas))
+        observe::simulated(eth, &tx, &gas);
+        Ok((access_list, gas?))
     }
 
     /// The calldata for this settlement.

crates/driver/src/domain/eth/mod.rs

@@ -314,6 +314,12 @@ impl num::Zero for Ether {
 #[derive(Debug, Clone, Copy)]
 pub struct BlockNo(pub u64);
 
+impl From<u64> for BlockNo {
+    fn from(value: u64) -> Self {
+        Self(value)
+    }
+}
+
 /// An onchain transaction which interacts with a smart contract.
 #[derive(Debug, Clone, Eq, PartialEq)]
 pub struct Interaction {

crates/driver/src/infra/observe/mod.rs

@@ -4,7 +4,7 @@
 //! and update the metrics, if the event is worth measuring.
 
 use {
-    super::Mempool,
+    super::{simulator, Ethereum, Mempool},
     crate::{
         boundary,
         domain::{
@@ -348,6 +348,10 @@ pub fn order_excluded_from_auction(
 }
 
 /// Observe that a settlement was simulated
-pub fn simulated(tx: &eth::Tx, gas: Gas) {
-    tracing::debug!(gas = ?gas.0, ?tx, "simulated settlement");
+pub fn simulated(eth: &Ethereum, tx: &eth::Tx, gas: &Result<Gas, simulator::Error>) {
+    let block: eth::BlockNo = eth.current_block().borrow().number.into();
+    match gas {
+        Ok(gas) => tracing::debug!(block = ?block, gas = ?gas.0, ?tx, "simulated settlement"),
+        Err(err) => tracing::debug!(block = ?block, ?err, "simulated settlement"),
+    }
 }