From caf8e7a49d60ca4230e5ec4417c2ef2060c94ee3 Mon Sep 17 00:00:00 2001
From: Anna Henningsen <anna@addaleax.net>
Date: Sun, 2 Sep 2018 17:30:20 +0200
Subject: [PATCH] worker: display MessagePort status in util.inspect()

PR-URL: https://github.com/nodejs/node/pull/22658
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
---
 lib/internal/worker.js | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/lib/internal/worker.js b/lib/internal/worker.js
index a1abcff567d424..402fc30b591d2d 100644
--- a/lib/internal/worker.js
+++ b/lib/internal/worker.js
@@ -125,6 +125,27 @@ MessagePort.prototype.close = function(cb) {
 const drainMessagePort = MessagePort.prototype.drain;
 delete MessagePort.prototype.drain;
 
+Object.defineProperty(MessagePort.prototype, util.inspect.custom, {
+  enumerable: false,
+  writable: false,
+  value: function inspect() {  // eslint-disable-line func-name-matching
+    let ref;
+    try {
+      // This may throw when `this` does not refer to a native object,
+      // e.g. when accessing the prototype directly.
+      ref = this.hasRef();
+    } catch { return this; }
+    return Object.assign(Object.create(MessagePort.prototype),
+                         ref === undefined ? {
+                           active: false,
+                         } : {
+                           active: true,
+                           refed: ref
+                         },
+                         this);
+  }
+});
+
 function setupPortReferencing(port, eventEmitter, eventName) {
   // Keep track of whether there are any workerMessage listeners:
   // If there are some, ref() the channel so it keeps the event loop alive.