src: simplify handle closing

Remove one extra closing state and use a smart pointer for
deleting `HandleWrap`s.

PR-URL: #20876
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Shingo Inoue <leko.noor@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: John-David Dalton <john.david.dalton@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>

Author: addaleax

src/handle_wrap.cc

@@ -67,7 +67,7 @@ void HandleWrap::Close(const FunctionCallbackInfo<Value>& args) {
   wrap->Close(args[0]);
 }
 
-void HandleWrap::Close(v8::Local<v8::Value> close_callback) {
+void HandleWrap::Close(Local<Value> close_callback) {
   if (state_ != kInitialized)
     return;
 
@@ -77,8 +77,7 @@ void HandleWrap::Close(v8::Local<v8::Value> close_callback) {
 
   if (!close_callback.IsEmpty() && close_callback->IsFunction()) {
     object()->Set(env()->context(), env()->onclose_string(), close_callback)
-        .FromJust();
-    state_ = kClosingWithCallback;
+        .FromMaybe(false);
   }
 }
 
@@ -109,24 +108,23 @@ HandleWrap::HandleWrap(Environment* env,
 
 
 void HandleWrap::OnClose(uv_handle_t* handle) {
-  HandleWrap* wrap = static_cast<HandleWrap*>(handle->data);
+  std::unique_ptr<HandleWrap> wrap { static_cast<HandleWrap*>(handle->data) };
   Environment* env = wrap->env();
   HandleScope scope(env->isolate());
   Context::Scope context_scope(env->context());
 
   // The wrap object should still be there.
   CHECK_EQ(wrap->persistent().IsEmpty(), false);
-  CHECK(wrap->state_ >= kClosing && wrap->state_ <= kClosingWithCallback);
+  CHECK_EQ(wrap->state_, kClosing);
 
-  const bool have_close_callback = (wrap->state_ == kClosingWithCallback);
   wrap->state_ = kClosed;
 
   wrap->OnClose();
 
-  if (have_close_callback)
+  if (wrap->object()->Has(env->context(), env->onclose_string())
+      .FromMaybe(false)) {
     wrap->MakeCallback(env->onclose_string(), 0, nullptr);
-
-  delete wrap;
+  }
 }
 
 

src/handle_wrap.h

@@ -95,7 +95,7 @@ class HandleWrap : public AsyncWrap {
   // refer to `doc/guides/node-postmortem-support.md`
   friend int GenDebugSymbols();
   ListNode<HandleWrap> handle_wrap_queue_;
-  enum { kInitialized, kClosing, kClosingWithCallback, kClosed } state_;
+  enum { kInitialized, kClosing, kClosed } state_;
   uv_handle_t* const handle_;
 };