From c53184e87629f38c547c3defa1651e3ef08f11b6 Mon Sep 17 00:00:00 2001
From: Anna Henningsen <anna@addaleax.net>
Date: Sun, 23 May 2021 16:20:41 +0200
Subject: [PATCH] worker: do not look up context twice in PostMessage
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Refs: https://github.com/nodejs/node/issues/38780#issuecomment-846548949

PR-URL: https://github.com/nodejs/node/pull/38784
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>
---
 src/node_messaging.cc | 6 ++++--
 src/node_messaging.h  | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/node_messaging.cc b/src/node_messaging.cc
index 9d17e670aec459..804d520497cf3a 100644
--- a/src/node_messaging.cc
+++ b/src/node_messaging.cc
@@ -824,11 +824,11 @@ BaseObjectPtr<BaseObject> MessagePortData::Deserialize(
 }
 
 Maybe<bool> MessagePort::PostMessage(Environment* env,
+                                     Local<Context> context,
                                      Local<Value> message_v,
                                      const TransferList& transfer_v) {
   Isolate* isolate = env->isolate();
   Local<Object> obj = object(isolate);
-  Local<Context> context = obj->CreationContext();
 
   Message msg;
 
@@ -970,7 +970,9 @@ void MessagePort::PostMessage(const FunctionCallbackInfo<Value>& args) {
     return;
   }
 
-  port->PostMessage(env, args[0], transfer_list);
+  Maybe<bool> res = port->PostMessage(env, context, args[0], transfer_list);
+  if (res.IsJust())
+    args.GetReturnValue().Set(res.FromJust());
 }
 
 void MessagePort::Start() {
diff --git a/src/node_messaging.h b/src/node_messaging.h
index 34215349343722..76fc2898430baa 100644
--- a/src/node_messaging.h
+++ b/src/node_messaging.h
@@ -181,6 +181,7 @@ class MessagePort : public HandleWrap {
   // If this port is closed, or if there is no sibling, this message is
   // serialized with transfers, then silently discarded.
   v8::Maybe<bool> PostMessage(Environment* env,
+                              v8::Local<v8::Context> context,
                               v8::Local<v8::Value> message,
                               const TransferList& transfer);