From a3626136a6c066a9e25d28721130617407bd41ed Mon Sep 17 00:00:00 2001
From: Willian Mitsuda <wmitsuda@gmail.com>
Date: Thu, 28 Oct 2021 23:39:33 -0300
Subject: [PATCH] Avoid getting erc20 metadata multiple times in the same
 session

---
 src/TokenTransferItem.tsx               | 2 +-
 src/components/DecoratedAddressLink.tsx | 2 +-
 src/types.ts                            | 2 +-
 src/useErigonHooks.ts                   | 3 ++-
 4 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/TokenTransferItem.tsx b/src/TokenTransferItem.tsx
index 083f7f0..5a1d5cc 100644
--- a/src/TokenTransferItem.tsx
+++ b/src/TokenTransferItem.tsx
@@ -15,7 +15,7 @@ import {
 type TokenTransferItemProps = {
   t: TokenTransfer;
   txData: TransactionData;
-  tokenMeta?: TokenMeta | undefined;
+  tokenMeta: TokenMeta | null | undefined;
 };
 
 // TODO: handle partial
diff --git a/src/components/DecoratedAddressLink.tsx b/src/components/DecoratedAddressLink.tsx
index 0b38fab..a39d2d8 100644
--- a/src/components/DecoratedAddressLink.tsx
+++ b/src/components/DecoratedAddressLink.tsx
@@ -20,7 +20,7 @@ type DecoratedAddressLinkProps = {
   selfDestruct?: boolean;
   txFrom?: boolean;
   txTo?: boolean;
-  tokenMeta?: TokenMeta;
+  tokenMeta?: TokenMeta | null | undefined;
 };
 
 const DecoratedAddresssLink: React.FC<DecoratedAddressLinkProps> = ({
diff --git a/src/types.ts b/src/types.ts
index 5904b31..e71a492 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -108,4 +108,4 @@ export type TokenMeta = {
   decimals: number;
 };
 
-export type TokenMetas = Record<string, TokenMeta>;
+export type TokenMetas = Record<string, TokenMeta | null | undefined>;
diff --git a/src/useErigonHooks.ts b/src/useErigonHooks.ts
index e0bba21..17d629f 100644
--- a/src/useErigonHooks.ts
+++ b/src/useErigonHooks.ts
@@ -222,7 +222,7 @@ export const useTxData = (
       // Extract token meta
       const tokenMetas: TokenMetas = {};
       for (const t of tokenTransfers) {
-        if (tokenMetas[t.token]) {
+        if (tokenMetas[t.token] !== undefined) {
           continue;
         }
         const erc20Contract = new Contract(t.token, erc20, provider);
@@ -238,6 +238,7 @@ export const useTxData = (
             decimals,
           };
         } catch (err) {
+          tokenMetas[t.token] = null;
           console.warn(`Couldn't get token ${t.token} metadata; ignoring`, err);
         }
       }