async_hooks: make AsyncResource match emitInit

AsyncResource previously called emitInitNative. Since AsyncResource is
just an abstraction on top of the emitEventScript functions, it should
call emitInitScript instead.

PR-URL: #14152
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

lib/async_hooks.js

@@ -207,28 +207,16 @@ function triggerAsyncId() {
 // Embedder API //
 
 class AsyncResource {
-  constructor(type, triggerAsyncId) {
-    this[async_id_symbol] = ++async_uid_fields[kAsyncUidCntr];
-    // Read and reset the current kInitTriggerId so that when the constructor
-    // finishes the kInitTriggerId field is always 0.
-    if (triggerAsyncId === undefined) {
-      triggerAsyncId = initTriggerId();
-    // If a triggerAsyncId was passed, any kInitTriggerId still must be null'd.
-    } else {
-      async_uid_fields[kInitTriggerId] = 0;
-    }
-    this[trigger_id_symbol] = triggerAsyncId;
-
-    if (typeof type !== 'string' || type.length <= 0)
-      throw new TypeError('type must be a string with length > 0');
+  constructor(type, triggerAsyncId = initTriggerId()) {
+    // Unlike emitInitScript, AsyncResource doesn't supports null as the
+    // triggerAsyncId.
     if (!Number.isSafeInteger(triggerAsyncId) || triggerAsyncId < 0)
       throw new RangeError('triggerAsyncId must be an unsigned integer');
 
-    // Return immediately if there's nothing to do.
-    if (async_hook_fields[kInit] === 0)
-      return;
+    this[async_id_symbol] = ++async_uid_fields[kAsyncUidCntr];
+    this[trigger_id_symbol] = triggerAsyncId;
 
-    emitInitNative(this[async_id_symbol], type, triggerAsyncId, this);
+    emitInitScript(this[async_id_symbol], type, this[trigger_id_symbol], this);
   }
 
   emitBefore() {
@@ -323,6 +311,9 @@ function emitInitScript(asyncId, type, triggerAsyncId, resource) {
   // manually means that the embedder must have used initTriggerId().
   if (triggerAsyncId === null) {
     triggerAsyncId = initTriggerId();
+  } else {
+    // If a triggerAsyncId was passed, any kInitTriggerId still must be null'd.
+    async_uid_fields[kInitTriggerId] = 0;
   }
 
   // TODO(trevnorris): I'd prefer allowing these checks to not exist, or only

test/async-hooks/test-embedder.api.async-resource.js

@@ -18,8 +18,8 @@ assert.throws(() => new AsyncResource('invalid_trigger_id', null),
               /^RangeError: triggerAsyncId must be an unsigned integer$/);
 
 assert.strictEqual(
-    typeof new AsyncResource('default_trigger_id').triggerAsyncId(),
-    'number'
+    new AsyncResource('default_trigger_id').triggerAsyncId(),
+    async_hooks.executionAsyncId()
 );
 
 // create first custom event 'alcazares' with triggerAsyncId derived

test/parallel/test-async-wrap-asyncresource-constructor.js → test/parallel/test-async-hooks-asyncresource-constructor.js

@@ -4,7 +4,13 @@ require('../common');
 // This tests that AsyncResource throws an error if bad parameters are passed
 
 const assert = require('assert');
-const AsyncResource = require('async_hooks').AsyncResource;
+const async_hooks = require('async_hooks');
+const { AsyncResource } = async_hooks;
+
+// Setup init hook such parameters are validated
+async_hooks.createHook({
+  init() {}
+}).enable();
 
 assert.throws(() => {
   return new AsyncResource();