From 832f5f435f00d0276c27f9dba8c5e0dab18f4f5b Mon Sep 17 00:00:00 2001
From: Willian Mitsuda <wmitsuda@gmail.com>
Date: Mon, 29 Nov 2021 14:45:14 -0300
Subject: [PATCH] Reduce the amount of network calls by probing first only
 name() and on success probe other erc20 methods

---
 src/api/address-resolver/ERCTokenResolver.ts | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/src/api/address-resolver/ERCTokenResolver.ts b/src/api/address-resolver/ERCTokenResolver.ts
index f087ec6..49301bd 100644
--- a/src/api/address-resolver/ERCTokenResolver.ts
+++ b/src/api/address-resolver/ERCTokenResolver.ts
@@ -1,24 +1,31 @@
 import { BaseProvider } from "@ethersproject/providers";
 import { Contract } from "@ethersproject/contracts";
+import { Interface } from "@ethersproject/abi";
 import { IAddressResolver } from "./address-resolver";
 import erc20 from "../../erc20.json";
 import { TokenMeta } from "../../types";
 
+const erc20Interface = new Interface(erc20);
+
 export class ERCTokenResolver implements IAddressResolver<TokenMeta> {
   async resolveAddress(
     provider: BaseProvider,
     address: string
   ): Promise<TokenMeta | undefined> {
-    const erc20Contract = new Contract(address, erc20, provider);
+    const erc20Contract = new Contract(address, erc20Interface, provider);
     try {
-      const [name, symbol, decimals] = (await Promise.all([
-        erc20Contract.name(),
+      const name = (await erc20Contract.name()) as string;
+      if (!name.trim()) {
+        return undefined;
+      }
+
+      const [symbol, decimals] = (await Promise.all([
         erc20Contract.symbol(),
         erc20Contract.decimals(),
-      ])) as [string, string, number];
+      ])) as [string, number];
 
       // Prevent faulty tokens with empty name/symbol
-      if (!name.trim() || !symbol.trim()) {
+      if (!symbol.trim()) {
         return undefined;
       }