http2: refactor ping + settings object lifetime management

Have clearer ownership relations between the `Http2Ping`,
`Http2Settings` and `Http2Session` objects.

Ping and Settings objects are now owned by the `Http2Session`
instance, and deleted along with it, so neither type of object
refers to the session after it is gone.
In the case of `Http2Ping`s, that deletion is slightly delayed,
so we explicitly reset its `session_` property.

Fixes: https://github.com/nodejs/node/issues/28088

PR-URL: https://github.com/nodejs/node/pull/28150
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/base_object-inl.h b/src/base_object-inl.h
index 50d8aba4a94..af69084f4a5 100644
--- a/src/base_object-inl.h
+++ b/src/base_object-inl.h
@@ -40,9 +40,8 @@ BaseObject::BaseObject(Environment* env, v8::Local<v8::Object> object)
   env_->AddCleanupHook(DeleteMe, static_cast<void*>(this));
 }
 
-
 BaseObject::~BaseObject() {
-  env_->RemoveCleanupHook(DeleteMe, static_cast<void*>(this));
+  RemoveCleanupHook();
 
   if (persistent_handle_.IsEmpty()) {
     // This most likely happened because the weak callback below cleared it.
@@ -55,6 +54,9 @@ BaseObject::~BaseObject() {
   }
 }
 
+void BaseObject::RemoveCleanupHook() {
+  env_->RemoveCleanupHook(DeleteMe, static_cast<void*>(this));
+}
 
 v8::Global<v8::Object>& BaseObject::persistent() {
   return persistent_handle_;