From e05ebe8f9b032d425d1724d6f75f897e98bd560c Mon Sep 17 00:00:00 2001
From: Santiago Gimeno <santiago.gimeno@gmail.com>
Date: Thu, 27 Oct 2022 14:25:55 +0200
Subject: [PATCH] src: print nghttp2 logs when using --debug-nghttp2

PR-URL: https://github.com/nodejs/node/pull/45209
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
---
 node.gyp          |  3 +++
 src/node_http2.cc | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/node.gyp b/node.gyp
index dffcce4c1308f3..642592fa246e51 100644
--- a/node.gyp
+++ b/node.gyp
@@ -933,6 +933,9 @@
             },
           ],
         }],
+        [ 'debug_nghttp2==1', {
+          'defines': [ 'NODE_DEBUG_NGHTTP2=1' ]
+        }],
       ],
       'actions': [
         {
diff --git a/src/node_http2.cc b/src/node_http2.cc
index f87c9811a6375b..4ab485018c656b 100644
--- a/src/node_http2.cc
+++ b/src/node_http2.cc
@@ -3179,6 +3179,12 @@ void SetCallbackFunctions(const FunctionCallbackInfo<Value>& args) {
 #undef SET_FUNCTION
 }
 
+#ifdef NODE_DEBUG_NGHTTP2
+void NgHttp2Debug(const char* format, va_list args) {
+  vfprintf(stderr, format, args);
+}
+#endif
+
 void Http2State::MemoryInfo(MemoryTracker* tracker) const {
   tracker->TrackField("root_buffer", root_buffer);
 }
@@ -3344,6 +3350,10 @@ void Initialize(Local<Object> target,
 #undef V
 
   target->Set(context, env->constants_string(), constants).Check();
+
+#ifdef NODE_DEBUG_NGHTTP2
+  nghttp2_set_debug_vprintf_callback(NgHttp2Debug);
+#endif
 }
 }  // namespace http2
 }  // namespace node