async_wrap: allow user to pass execution_async_id

Allow the user to pass in an execution_async_id instead of always
generating one. This way the JS API can be used to pre-allocate the
execution_async_id when the JS object is instantiated, before the native
resource is created.

Also allow the new execution_async_id to be passed via asyncReset().

PR-URL: nodejs/node#14208
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

src/async-wrap.cc

@@ -455,7 +455,8 @@ void AsyncWrap::ClearAsyncIdStack(const FunctionCallbackInfo<Value>& args) {
 void AsyncWrap::AsyncReset(const FunctionCallbackInfo<Value>& args) {
   AsyncWrap* wrap;
   ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
-  wrap->AsyncReset();
+  double execution_async_id = args[0]->IsNumber() ? args[0]->NumberValue() : -1;
+  wrap->AsyncReset(execution_async_id);
 }
 
 
@@ -577,7 +578,8 @@ void LoadAsyncWrapperInfo(Environment* env) {
 
 AsyncWrap::AsyncWrap(Environment* env,
                      Local<Object> object,
-                     ProviderType provider)
+                     ProviderType provider,
+                     double execution_async_id)
     : BaseObject(env, object),
       provider_type_(provider) {
   CHECK_NE(provider, PROVIDER_NONE);
@@ -587,7 +589,7 @@ AsyncWrap::AsyncWrap(Environment* env,
   persistent().SetWrapperClassId(NODE_ASYNC_ID_OFFSET + provider);
 
   // Use AsyncReset() call to execute the init() callbacks.
-  AsyncReset();
+  AsyncReset(execution_async_id);
 }
 
 
@@ -603,7 +605,7 @@ AsyncWrap::AsyncWrap(Environment* env,
   persistent().SetWrapperClassId(NODE_ASYNC_ID_OFFSET + provider_type_);
 
   // Use AsyncReset() call to execute the init() callbacks.
-  AsyncReset(silent);
+  AsyncReset(-1, silent);
 }
 
 
@@ -615,8 +617,9 @@ AsyncWrap::~AsyncWrap() {
 // Generalized call for both the constructor and for handles that are pooled
 // and reused over their lifetime. This way a new uid can be assigned when
 // the resource is pulled out of the pool and put back into use.
-void AsyncWrap::AsyncReset(bool silent) {
-  async_id_ = env()->new_async_id();
+void AsyncWrap::AsyncReset(double execution_async_id, bool silent) {
+  async_id_ =
+    execution_async_id == -1 ? env()->new_async_id() : execution_async_id;
   trigger_async_id_ = env()->get_init_trigger_async_id();
 
   if (silent) return;

src/async-wrap.h

@@ -94,7 +94,8 @@ class AsyncWrap : public BaseObject {
 
   AsyncWrap(Environment* env,
             v8::Local<v8::Object> object,
-            ProviderType provider);
+            ProviderType provider,
+            double execution_async_id = -1);
 
   virtual ~AsyncWrap();
 
@@ -132,7 +133,7 @@ class AsyncWrap : public BaseObject {
 
   inline double get_trigger_async_id() const;
 
-  void AsyncReset(bool silent = false);
+  void AsyncReset(double execution_async_id = -1, bool silent = false);
 
   // Only call these within a valid HandleScope.
   v8::MaybeLocal<v8::Value> MakeCallback(const v8::Local<v8::Function> cb,