fix: simulation error enriching (#10595)

Fixes:
- `Failed to enrich public simulation`
- `Error: Invalid Function Selector length 0 (expected 4)`
- Full source code being printed out on error
- [This
commit](7227b48)
caused entire `SimulationError` and therefore its source code member to
be printed out.

yarn-project/circuit-types/src/simulation_error.ts

@@ -78,6 +78,8 @@ export function isNoirCallStackUnresolved(callStack: NoirCallStack): callStack i
  * An error during the simulation of a function call.
  */
 export class SimulationError extends Error {
+  private aztecContext: string = '';
+
   constructor(
     private originalMessage: string,
     private functionErrorStack: FailingFunction[],
@@ -124,7 +126,9 @@ export class SimulationError extends Error {
 
   getMessage() {
     if (this.noirErrorStack && !isNoirCallStackUnresolved(this.noirErrorStack) && this.noirErrorStack.length) {
-      return `${this.originalMessage} '${this.noirErrorStack[this.noirErrorStack.length - 1].locationText}'`;
+      return `${this.originalMessage} '${this.noirErrorStack[this.noirErrorStack.length - 1].locationText}'${
+        this.aztecContext
+      }`;
     }
     return this.originalMessage;
   }
@@ -212,6 +216,10 @@ export class SimulationError extends Error {
     this.noirErrorStack = callStack;
   }
 
+  setAztecContext(context: string) {
+    this.aztecContext = context;
+  }
+
   toJSON() {
     return {
       originalMessage: this.originalMessage,

yarn-project/foundation/src/abi/event_selector.ts

@@ -62,7 +62,7 @@ export class EventSelector extends Selector {
   static fromString(selector: string) {
     const buf = fromHex(selector);
     if (buf.length !== Selector.SIZE) {
-      throw new Error(`Invalid Selector length ${buf.length} (expected ${Selector.SIZE}).`);
+      throw new Error(`Invalid EventSelector length ${buf.length} (expected ${Selector.SIZE}).`);
     }
     return EventSelector.fromBuffer(buf);
   }

yarn-project/foundation/src/abi/function_selector.ts

@@ -91,7 +91,7 @@ export class FunctionSelector extends Selector {
   static fromString(selector: string) {
     const buf = fromHex(selector);
     if (buf.length !== Selector.SIZE) {
-      throw new Error(`Invalid Selector length ${buf.length} (expected ${Selector.SIZE}).`);
+      throw new Error(`Invalid FunctionSelector length ${buf.length} (expected ${Selector.SIZE}).`);
     }
     return FunctionSelector.fromBuffer(buf);
   }

yarn-project/pxe/src/pxe_service/error_enriching.ts

@@ -11,26 +11,26 @@ import { type ContractDataOracle, type PxeDatabase } from '../index.js';
  * @param err - The error to enrich.
  */
 export async function enrichSimulationError(err: SimulationError, db: PxeDatabase, logger: Logger) {
-  // Maps contract addresses to the set of functions selectors that were in error.
+  // Maps contract addresses to the set of function names that were in error.
   // Map and Set do reference equality for their keys instead of value equality, so we store the string
   // representation to get e.g. different contract address objects with the same address value to match.
   const mentionedFunctions: Map<string, Set<string>> = new Map();
 
-  err.getCallStack().forEach(({ contractAddress, functionSelector }) => {
+  err.getCallStack().forEach(({ contractAddress, functionName }) => {
     if (!mentionedFunctions.has(contractAddress.toString())) {
       mentionedFunctions.set(contractAddress.toString(), new Set());
     }
-    mentionedFunctions.get(contractAddress.toString())!.add(functionSelector?.toString() ?? '');
+    mentionedFunctions.get(contractAddress.toString())!.add(functionName?.toString() ?? '');
   });
 
   await Promise.all(
-    [...mentionedFunctions.entries()].map(async ([contractAddress, selectors]) => {
+    [...mentionedFunctions.entries()].map(async ([contractAddress, fnNames]) => {
       const parsedContractAddress = AztecAddress.fromString(contractAddress);
       const contract = await db.getContract(parsedContractAddress);
       if (contract) {
         err.enrichWithContractName(parsedContractAddress, contract.name);
-        selectors.forEach(selector => {
-          const functionArtifact = contract.functions.find(f => FunctionSelector.fromString(selector).equals(f));
+        fnNames.forEach(fnName => {
+          const functionArtifact = contract.functions.find(f => fnName === f.name);
           if (functionArtifact) {
             err.enrichWithFunctionName(
               parsedContractAddress,
@@ -39,7 +39,7 @@ export async function enrichSimulationError(err: SimulationError, db: PxeDatabas
             );
           } else {
             logger.warn(
-              `Could not function artifact in contract ${contract.name} for selector ${selector} when enriching error callstack`,
+              `Could not function artifact in contract ${contract.name} for function '${fnName}' when enriching error callstack`,
             );
           }
         });

yarn-project/pxe/src/pxe_service/pxe_service.ts

@@ -1004,10 +1004,15 @@ export class PXEService implements PXE {
   }
 
   private contextualizeError(err: Error, ...context: string[]): Error {
-    this.log.error(err.name, err);
-    this.log.debug('Context:');
-    for (const c of context) {
-      this.log.debug(c);
+    let contextStr = '';
+    if (context.length > 0) {
+      contextStr = `\nContext:\n${context.join('\n')}`;
+    }
+    if (err instanceof SimulationError) {
+      err.setAztecContext(contextStr);
+    } else {
+      this.log.error(err.name, err);
+      this.log.debug(contextStr);
     }
     return err;
   }

yarn-project/simulator/src/common/debug_fn_name.ts

@@ -12,5 +12,5 @@ export async function getPublicFunctionDebugName(
     calldata[0] !== undefined
       ? await db.getDebugFunctionName(contractAddress, FunctionSelector.fromField(calldata[0]))
       : `<calldata[0] undefined> (Contract Address: ${contractAddress})`;
-  return `${targetFunction} (via dispatch)`;
+  return `${targetFunction}`;
 }