From 845492f0b3ceced6d6c9097262bc603848a99353 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Natan=20S=C4=85gol?= <m@merlinnot.com>
Date: Thu, 7 Nov 2019 20:42:33 +0100
Subject: [PATCH] fix: prevent exceeding timer limitations when backing off

---
 packages/grpc-js/src/subchannel.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/grpc-js/src/subchannel.ts b/packages/grpc-js/src/subchannel.ts
index 3598a9b9..2ef23745 100644
--- a/packages/grpc-js/src/subchannel.ts
+++ b/packages/grpc-js/src/subchannel.ts
@@ -283,7 +283,7 @@ export class Subchannel {
          * https://github.com/grpc/proposal/blob/master/A8-client-side-keepalive.md#basic-keepalive */
         if (errorCode === http2.constants.NGHTTP2_ENHANCE_YOUR_CALM && opaqueData.equals(tooManyPingsData)) {
           logging.log(LogVerbosity.ERROR, `Connection to ${this.channelTarget} rejected by server because of excess pings`);
-          this.keepaliveTimeMs *= 2;
+          this.keepaliveTimeMs = Math.min(2 * this.keepaliveTimeMs, KEEPALIVE_TIME_MS);
         }
         this.transitionToState(
           [ConnectivityState.CONNECTING, ConnectivityState.READY],