From a02510db2d52fa098836b2655d42511ae6f9fc05 Mon Sep 17 00:00:00 2001
From: Dafydd Durairaj <dafydd.durairaj@gmail.com>
Date: Mon, 24 Aug 2020 14:20:45 -0400
Subject: [PATCH] Exponential backoff on waiting between 429 Errors in
 connection.js

---
 web3.js/src/connection.js | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/web3.js/src/connection.js b/web3.js/src/connection.js
index c97f7c09805e9f..2cb01fb0dc0c3e 100644
--- a/web3.js/src/connection.js
+++ b/web3.js/src/connection.js
@@ -509,21 +509,23 @@ function createRpcRequest(url): RpcRequest {
     try {
       let too_many_requests_retries = 5;
       let res = {};
-
+      let waitTime = 500;
       for (;;) {
         res = await fetch(url, options);
         if (
-          res.status !== 429 /* Too many requests */ ||
-          too_many_requests_retries === 0
+            res.status !== 429 /* Too many requests */
         ) {
           break;
         }
-
+        too_many_requests_retries -= 1;
+        if (too_many_requests_retries === 0) {
+          break;
+        }
         console.log(
-          `Server responded with ${res.status} ${res.statusText}.  Retrying after brief delay...`,
+            `Server responded with ${res.status} ${res.statusText}.  Retrying after ${waitTime}ms delay...`,
         );
-        await sleep(500);
-        too_many_requests_retries -= 1;
+        await sleep(waitTime);
+        waitTime *= 2;
       }
 
       const text = await res.text();