http2: allow setting the local window size of a session

PR-URL: https://github.com/nodejs/node/pull/35978
Fixes: https://github.com/nodejs/node/issues/31084
Refs: https://github.com/nodejs/node/pull/26962
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Ricky Zhou <0x19951125@gmail.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/node_http2.cc b/src/node_http2.cc
index b8e462419e5..776393de8f8 100644
--- a/src/node_http2.cc
+++ b/src/node_http2.cc
@@ -2416,6 +2416,25 @@ void Http2Session::SetNextStreamID(const FunctionCallbackInfo<Value>& args) {
   Debug(session, "set next stream id to %d", id);
 }
 
+// Set local window size (local endpoints's window size) to the given
+// window_size for the stream denoted by 0.
+// This function returns 0 if it succeeds, or one of a negative codes
+void Http2Session::SetLocalWindowSize(
+    const FunctionCallbackInfo<Value>& args) {
+  Environment* env = Environment::GetCurrent(args);
+  Http2Session* session;
+  ASSIGN_OR_RETURN_UNWRAP(&session, args.Holder());
+
+  int32_t window_size = args[0]->Int32Value(env->context()).ToChecked();
+
+  int result = nghttp2_session_set_local_window_size(
+      session->session(), NGHTTP2_FLAG_NONE, 0, window_size);
+
+  args.GetReturnValue().Set(result);
+
+  Debug(session, "set local window size to %d", window_size);
+}
+
 // A TypedArray instance is shared between C++ and JS land to contain the
 // SETTINGS (either remote or local). RefreshSettings updates the current
 // values established for each of the settings so those can be read in JS land.
@@ -3088,6 +3107,8 @@ void Initialize(Local<Object> target,
   env->SetProtoMethod(session, "request", Http2Session::Request);
   env->SetProtoMethod(session, "setNextStreamID",
                       Http2Session::SetNextStreamID);
+  env->SetProtoMethod(session, "setLocalWindowSize",
+                      Http2Session::SetLocalWindowSize);
   env->SetProtoMethod(session, "updateChunksSent",
                       Http2Session::UpdateChunksSent);
   env->SetProtoMethod(session, "refreshState", Http2Session::RefreshState);