async_hooks: use parent promise as triggerId in init hook

async_hooks init callback will be triggered when promise newly created,
in previous version, the parent promise which pass from chrome V8 PromiseHook
is ignored, so we can't tell the promise is a pure new promise or a
chained promise.

In this commit, we use the parent promise's id as triggerId to
trigger the init callback.

Fixes: nodejs#13302

src/async-wrap.cc

@@ -296,6 +296,23 @@ static void PromiseHook(PromiseHookType type, Local<Promise> promise,
   PromiseWrap* wrap = Unwrap<PromiseWrap>(promise);
   if (type == PromiseHookType::kInit || wrap == nullptr) {
     bool silent = type != PromiseHookType::kInit;
+    // set parent promise's async Id as this promise's triggerId
+    if (parent->IsPromise()) {
+      // parent promise exists, current promise
+      // is a chained promise, so we set parent promise's id as
+      // current promise's triggerId
+      Local<Promise> parent_promise = parent.As<Promise>();
+      auto parent_wrap = Unwrap<PromiseWrap>(parent_promise);
+
+      if (parent_wrap == nullptr) {
+        // create a new PromiseWrap for parent promise with silent parameter
+        parent_wrap = new PromiseWrap(env, parent_promise, true);
+        parent_wrap->MakeWeak(parent_wrap);
+      }
+      // get id from parentWrap
+      double trigger_id = parent_wrap->get_id();
+      env->set_init_trigger_id(trigger_id);
+    }
     wrap = new PromiseWrap(env, promise, silent);
     wrap->MakeWeak(wrap);
   } else if (type == PromiseHookType::kResolve) {

test/async-hooks/test-promise.js

@@ -46,7 +46,7 @@ function onexit() {
   const a1 = as[1];
   assert.strictEqual(a1.type, 'PROMISE', 'promise request');
   assert.strictEqual(typeof a1.uid, 'number', 'uid is a number');
-  assert.strictEqual(a1.triggerId, 1, 'parent uid 1');
+  assert.strictEqual(a1.triggerId, 2, 'parent triggerId 2');
   // We expect a destroy hook as well but we cannot guarentee predictable gc.
   checkInvocations(a1, { init: 1, before: 1, after: 1 }, 'when process exits');
 }