refactor: use rpc-handler for ENS lookups

static/scripts/rewards/cirip/query-reverse-ens.ts

@@ -1,9 +1,7 @@
 import { app } from "../app-state";
-import { useRpcHandler } from "../web3/use-rpc-handler";
+import { useHandler, useRpcHandler } from "../web3/use-rpc-handler";
 import { ethers } from "ethers";
 
-const mainnetRpcUrl = "https://eth.drpc.org";
-
 export async function queryReverseEns(address: string, networkId: number) {
   // Try to get the ENS name from localStorage
   const cachedEnsName = localStorage.getItem(address);
@@ -20,7 +18,12 @@ export async function queryReverseEns(address: string, networkId: number) {
     return cachedEnsName;
   } else {
     // If the ENS name is not in localStorage, fetch it from the API
-    const web3Provider = new ethers.providers.JsonRpcProvider(mainnetRpcUrl);
+    const mainnetProvider = await useHandler(1).getFirstAvailableRpcProvider();
+    if (mainnetProvider === null) {
+      console.error("ENS lookup failed: no available mainnet RPC providers");
+      return "";
+    }
+    const web3Provider = new ethers.providers.JsonRpcProvider(mainnetProvider.connection.url);
     const ensName = await web3Provider.lookupAddress(address);
 
     if (ensName === null) {