Fix to return proper error string when public address not found in subgraph

Author: jferas

umbra-js/src/utils/utils.ts

@@ -329,19 +329,23 @@ export async function getMostRecentSubgraphStealthKeyChangedEventFromAddress(
     chainConfig
   );
   let theEvent: SubgraphStealthKeyChangedEvent | undefined;
-  for await (const event of stealthKeyChangedEvents) {
-    for (let i = 0; i < event.length; i++) {
-      if (theEvent) {
-        console.log(
-          `We found a previous StealthKeyChangedEvent for address ${address} in the subgraph at block ${event[i].block} with transaction hash ${event[i].txHash}`
-        );
-      } else {
-        theEvent = event[i];
-        console.log(
-          `We found a StealthKeyChangedEvent for address ${address} in the subgraph at block ${event[i].block} with transaction hash ${event[i].txHash}`
-        );
+  try {
+    for await (const event of stealthKeyChangedEvents) {
+      for (let i = 0; i < event.length; i++) {
+        if (theEvent) {
+          console.log(
+            `We found a previous StealthKeyChangedEvent for address ${address} in the subgraph at block ${event[i].block} with transaction hash ${event[i].txHash}`
+          );
+        } else {
+          theEvent = event[i];
+          console.log(
+            `We found a StealthKeyChangedEvent for address ${address} in the subgraph at block ${event[i].block} with transaction hash ${event[i].txHash}`
+          );
+        }
       }
     }
+  } catch (error) {
+    throw new Error(`Address ${address} has not registered stealth keys. Please ask them to setup their Umbra account`); // prettier-ignore
   }
 
   if (!theEvent) {

umbra-js/test/utils.test.ts

@@ -242,6 +242,7 @@ describe('Utilities', () => {
       );
     });
 
+    // prove test failure is related to the ordering of RPC query vs subgraph query, and subgraph URL is not setup
     it('throws when looking up an address that has not sent a transaction', async () => {
       const address = '0x0000000000000000000000000000000000000002';
       const ethersProvider = new StaticJsonRpcProvider(SEPOLIA_RPC_URL); // otherwise throws with unsupported network since we're on localhost