From af5207262ff6c542b299ec91c82942c10baed174 Mon Sep 17 00:00:00 2001
From: Michael Lumish <mlumish@google.com>
Date: Fri, 6 Aug 2021 11:11:30 -0700
Subject: [PATCH 1/2] grpc-js: Check for closed server stream before sending

---
 packages/grpc-js/package.json       | 2 +-
 packages/grpc-js/src/server-call.ts | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/grpc-js/package.json b/packages/grpc-js/package.json
index 87a75d79..f0e20ff1 100644
--- a/packages/grpc-js/package.json
+++ b/packages/grpc-js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@grpc/grpc-js",
-  "version": "1.3.6",
+  "version": "1.3.7",
   "description": "gRPC Library for Node - pure JS implementation",
   "homepage": "https://grpc.io/",
   "repository": "https://github.com/grpc/grpc-node/tree/master/packages/grpc-js",
diff --git a/packages/grpc-js/src/server-call.ts b/packages/grpc-js/src/server-call.ts
index aa8bd647..7d3fe192 100644
--- a/packages/grpc-js/src/server-call.ts
+++ b/packages/grpc-js/src/server-call.ts
@@ -429,7 +429,7 @@ export class Http2ServerCallStream<
   private checkCancelled(): boolean {
     /* In some cases the stream can become destroyed before the close event
      * fires. That creates a race condition that this check works around */
-    if (this.stream.destroyed) {
+    if (this.stream.destroyed || this.stream.closed) {
       this.cancelled = true;
     }
     return this.cancelled;

From ce2765f7fb1e5694a9990ee57f1142c1c87dcfa1 Mon Sep 17 00:00:00 2001
From: Michael Lumish <mlumish@google.com>
Date: Fri, 6 Aug 2021 11:53:48 -0700
Subject: [PATCH 2/2] grpc-js: Handle errors thrown by writing to http2 stream

---
 packages/grpc-js/src/call-stream.ts | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/packages/grpc-js/src/call-stream.ts b/packages/grpc-js/src/call-stream.ts
index 57693343..8d72bb3e 100644
--- a/packages/grpc-js/src/call-stream.ts
+++ b/packages/grpc-js/src/call-stream.ts
@@ -637,7 +637,15 @@ export class Http2CallStream implements Call {
             this.pendingWrite.length +
             ' (deferred)'
         );
-        stream.write(this.pendingWrite, this.pendingWriteCallback);
+        try {
+          stream.write(this.pendingWrite, this.pendingWriteCallback);
+        } catch (error) {
+          this.endCall({
+            code: Status.UNAVAILABLE,
+            details: `Write failed with error ${error.message}`,
+            metadata: new Metadata()
+          });
+        }
       }
       this.maybeCloseWrites();
     }
@@ -762,7 +770,15 @@ export class Http2CallStream implements Call {
         this.pendingWriteCallback = cb;
       } else {
         this.trace('sending data chunk of length ' + message.message.length);
-        this.http2Stream.write(message.message, cb);
+        try {
+          this.http2Stream.write(message.message, cb);
+        }  catch (error) {
+          this.endCall({
+            code: Status.UNAVAILABLE,
+            details: `Write failed with error ${error.message}`,
+            metadata: new Metadata()
+          });
+        }
         this.maybeCloseWrites();
       }
     }, this.handleFilterError.bind(this));