refactor(pxe): skip redundant getBlock RPC when querying at anchor block

Author: Nico Chamo

yarn-project/pxe/src/contract_function_simulator/oracle/utility_execution_oracle.ts

@@ -978,6 +978,11 @@ export class UtilityExecutionOracle implements IMiscOracle, IUtilityExecutionOra
 
   /** Runs a query concurrently with a validation that the block hash is not ahead of the anchor block. */
   async #queryWithBlockHashNotAfterAnchor<T>(blockHash: BlockHash, query: () => Promise<T>): Promise<T> {
+    const anchorHash = await this.anchorBlockHeader.hash();
+    if (blockHash.equals(anchorHash)) {
+      return query();
+    }
+
     const [response] = await Promise.all([
       query(),
       (async () => {
@@ -989,7 +994,7 @@ export class UtilityExecutionOracle implements IMiscOracle, IUtilityExecutionOra
 
         if (header.getBlockNumber() > this.anchorBlockHeader.getBlockNumber()) {
           throw new Error(
-            `Made a node query with a reference block hash ${blockHash} with block number ${header.getBlockNumber()}, which is ahead of the anchor block number ${this.anchorBlockHeader.getBlockNumber()} (from anchor block hash ${await this.anchorBlockHeader.hash()}).`,
+            `Made a node query with a reference block hash ${blockHash} with block number ${header.getBlockNumber()}, which is ahead of the anchor block number ${this.anchorBlockHeader.getBlockNumber()} (from anchor block hash ${anchorHash}).`,
           );
         }
       })(),