From 30bc44f4ce54811022b84e0623d3757bea71736b Mon Sep 17 00:00:00 2001
From: Michael Lumish <mlumish@google.com>
Date: Wed, 2 Aug 2023 16:48:57 -0700
Subject: [PATCH] grpc-js: Handle race between call cancellation and auth
 metadata generation

---
 packages/grpc-js/src/load-balancing-call.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/grpc-js/src/load-balancing-call.ts b/packages/grpc-js/src/load-balancing-call.ts
index 6e9718a7..b6c99094 100644
--- a/packages/grpc-js/src/load-balancing-call.ts
+++ b/packages/grpc-js/src/load-balancing-call.ts
@@ -140,6 +140,12 @@ export class LoadBalancingCall implements Call {
           .generateMetadata({ service_url: this.serviceUrl })
           .then(
             credsMetadata => {
+              /* If this call was cancelled (e.g. by the deadline) before
+               * metadata generation finished, we shouldn't do anything with
+               * it. */
+              if (this.ended) {
+                return;
+              }
               const finalMetadata = this.metadata!.clone();
               finalMetadata.merge(credsMetadata);
               if (finalMetadata.get('authorization').length > 1) {