async_wrap: add parent uid to init hook

When the parent uid is required it is not necessary to store the uid in
the parent handle object.

PR-URL: https://github.com/nodejs/node/pull/4600
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

src/async-wrap-inl.h

@@ -42,11 +42,14 @@ inline AsyncWrap::AsyncWrap(Environment* env,
   v8::Local<v8::Value> argv[] = {
     v8::Integer::New(env->isolate(), get_uid()),
     v8::Int32::New(env->isolate(), provider),
+    Null(env->isolate()),
     Null(env->isolate())
   };
 
-  if (parent != nullptr)
-    argv[2] = parent->object();
+  if (parent != nullptr) {
+    argv[2] = v8::Integer::New(env->isolate(), parent->get_uid());
+    argv[3] = parent->object();
+  }
 
   v8::MaybeLocal<v8::Value> ret =
       init_fn->Call(env->context(), object, ARRAY_SIZE(argv), argv);

test/parallel/test-async-wrap-disabled-propagate-parent.js

@@ -6,17 +6,24 @@ const net = require('net');
 const async_wrap = process.binding('async_wrap');
 const providers = Object.keys(async_wrap.Providers);
 
+const uidSymbol = Symbol('uid');
+
 let cntr = 0;
 let server;
 let client;
 
-function init(id, type, parent) {
-  if (parent) {
+function init(uid, type, parentUid, parentHandle) {
+  this[uidSymbol] = uid;
+
+  if (parentHandle) {
     cntr++;
     // Cannot assert in init callback or will abort.
     process.nextTick(() => {
       assert.equal(providers[type], 'TCPWRAP');
-      assert.equal(parent, server._handle, 'server doesn\'t match parent');
+      assert.equal(parentUid, server._handle[uidSymbol],
+                   'server uid doesn\'t match parent uid');
+      assert.equal(parentHandle, server._handle,
+                   'server handle doesn\'t match parent handle');
       assert.equal(this, client._handle, 'client doesn\'t match context');
     });
   }

test/parallel/test-async-wrap-propagate-parent.js

@@ -4,17 +4,26 @@ const common = require('../common');
 const assert = require('assert');
 const net = require('net');
 const async_wrap = process.binding('async_wrap');
+const providers = Object.keys(async_wrap.Providers);
+
+const uidSymbol = Symbol('uid');
 
 let cntr = 0;
 let server;
 let client;
 
-function init(id, type, parent) {
-  if (parent) {
+function init(uid, type, parentUid, parentHandle) {
+  this[uidSymbol] = uid;
+
+  if (parentHandle) {
     cntr++;
     // Cannot assert in init callback or will abort.
     process.nextTick(() => {
-      assert.equal(parent, server._handle, 'server doesn\'t match parent');
+      assert.equal(providers[type], 'TCPWRAP');
+      assert.equal(parentUid, server._handle[uidSymbol],
+                   'server uid doesn\'t match parent uid');
+      assert.equal(parentHandle, server._handle,
+                   'server handle doesn\'t match parent handle');
       assert.equal(this, client._handle, 'client doesn\'t match context');
     });
   }