fix(ext/node): return cancelled flag in get_response_body_chunk op (#23962)

The flag lets us exit from read loop without throwing an error when
the stream is cancelled.

This fixes gRPC cancellation example.

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/ext/node/polyfills/http2.ts b/ext/node/polyfills/http2.ts
index 59756dd0f..c47e54d1b 100644
--- a/ext/node/polyfills/http2.ts
+++ b/ext/node/polyfills/http2.ts
@@ -1007,9 +1007,14 @@ export class ClientHttp2Stream extends Duplex {
     debugHttp2(">>> read");
 
     (async () => {
-      const [chunk, finished] = await op_http2_client_get_response_body_chunk(
-        this[kDenoResponse].bodyRid,
-      );
+      const [chunk, finished, cancelled] =
+        await op_http2_client_get_response_body_chunk(
+          this[kDenoResponse].bodyRid,
+        );
+
+      if (cancelled) {
+        return;
+      }
 
       debugHttp2(">>> chunk", chunk, finished, this[kDenoResponse].bodyRid);
       if (chunk === null) {