child_process: swallow errors in internal communication

Much like with NODE_HANDLE_ACK, the internal protocol for communication
about the sent socket should not expose its errors to the users when
those async calls are not initiated by them.

PR-URL: #21108
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

Author: apapirovski

lib/internal/socket_list.js

@@ -13,11 +13,11 @@ class SocketListSend extends EventEmitter {
     child.once('exit', () => this.emit('exit', this));
   }
 
-  _request(msg, cmd, callback) {
+  _request(msg, cmd, swallowErrors, callback) {
     var self = this;
 
     if (!this.child.connected) return onclose();
-    this.child.send(msg);
+    this.child._send(msg, undefined, swallowErrors);
 
     function onclose() {
       self.child.removeListener('internalMessage', onreply);
@@ -40,14 +40,14 @@ class SocketListSend extends EventEmitter {
     this._request({
       cmd: 'NODE_SOCKET_NOTIFY_CLOSE',
       key: this.key
-    }, 'NODE_SOCKET_ALL_CLOSED', callback);
+    }, 'NODE_SOCKET_ALL_CLOSED', true, callback);
   }
 
   getConnections(callback) {
     this._request({
       cmd: 'NODE_SOCKET_GET_COUNT',
       key: this.key
-    }, 'NODE_SOCKET_COUNT', function(err, msg) {
+    }, 'NODE_SOCKET_COUNT', false, function(err, msg) {
       if (err) return callback(err);
       callback(null, msg.count);
     });
@@ -67,10 +67,10 @@ class SocketListReceive extends EventEmitter {
     function onempty(self) {
       if (!self.child.connected) return;
 
-      self.child.send({
+      self.child._send({
         cmd: 'NODE_SOCKET_ALL_CLOSED',
         key: self.key
-      });
+      }, undefined, true);
     }
 
     this.child.on('internalMessage', (msg) => {
@@ -84,7 +84,7 @@ class SocketListReceive extends EventEmitter {
         this.once('empty', onempty);
       } else if (msg.cmd === 'NODE_SOCKET_GET_COUNT') {
         if (!this.child.connected) return;
-        this.child.send({
+        this.child._send({
           cmd: 'NODE_SOCKET_COUNT',
           key: this.key,
           count: this.connections

test/parallel/parallel.status

@@ -7,7 +7,6 @@ prefix parallel
 [true] # This section applies to all platforms
 
 [$system==win32]
-test-child-process-fork-net-socket: PASS,FLAKY
 
 [$system==linux]
 

test/parallel/test-internal-socket-list-receive.js

@@ -12,7 +12,7 @@ const key = 'test-key';
 {
   const child = Object.assign(new EventEmitter(), {
     connected: false,
-    send: common.mustNotCall()
+    _send: common.mustNotCall()
   });
 
   const list = new SocketListReceive(child, key);
@@ -24,7 +24,7 @@ const key = 'test-key';
 {
   const child = Object.assign(new EventEmitter(), {
     connected: true,
-    send: common.mustCall((msg) => {
+    _send: common.mustCall((msg) => {
       assert.strictEqual(msg.cmd, 'NODE_SOCKET_ALL_CLOSED');
       assert.strictEqual(msg.key, key);
     })
@@ -38,7 +38,7 @@ const key = 'test-key';
 {
   const child = Object.assign(new EventEmitter(), {
     connected: true,
-    send: common.mustCall((msg) => {
+    _send: common.mustCall((msg) => {
       assert.strictEqual(msg.cmd, 'NODE_SOCKET_COUNT');
       assert.strictEqual(msg.key, key);
       assert.strictEqual(msg.count, 0);

test/parallel/test-internal-socket-list-send.js

@@ -16,7 +16,7 @@ const key = 'test-key';
 
   const list = new SocketListSend(child, 'test');
 
-  list._request('msg', 'cmd', common.mustCall((err) => {
+  list._request('msg', 'cmd', false, common.mustCall((err) => {
     common.expectsError({
       code: 'ERR_CHILD_CLOSED_BEFORE_REPLY',
       type: Error,
@@ -30,7 +30,7 @@ const key = 'test-key';
 {
   const child = Object.assign(new EventEmitter(), {
     connected: true,
-    send: function(msg) {
+    _send: function(msg) {
       process.nextTick(() =>
         this.emit('internalMessage', { key, cmd: 'cmd' })
       );
@@ -39,7 +39,7 @@ const key = 'test-key';
 
   const list = new SocketListSend(child, key);
 
-  list._request('msg', 'cmd', common.mustCall((err, msg) => {
+  list._request('msg', 'cmd', false, common.mustCall((err, msg) => {
     assert.strictEqual(err, null);
     assert.strictEqual(msg.cmd, 'cmd');
     assert.strictEqual(msg.key, key);
@@ -53,12 +53,12 @@ const key = 'test-key';
 {
   const child = Object.assign(new EventEmitter(), {
     connected: true,
-    send: function(msg) { process.nextTick(() => this.emit('disconnect')); }
+    _send: function(msg) { process.nextTick(() => this.emit('disconnect')); }
   });
 
   const list = new SocketListSend(child, key);
 
-  list._request('msg', 'cmd', common.mustCall((err) => {
+  list._request('msg', 'cmd', false, common.mustCall((err) => {
     common.expectsError({
       code: 'ERR_CHILD_CLOSED_BEFORE_REPLY',
       type: Error,
@@ -73,7 +73,7 @@ const key = 'test-key';
 {
   const child = Object.assign(new EventEmitter(), {
     connected: true,
-    send: function(msg) {
+    _send: function(msg) {
       assert.strictEqual(msg.cmd, 'NODE_SOCKET_NOTIFY_CLOSE');
       assert.strictEqual(msg.key, key);
       process.nextTick(() =>
@@ -98,7 +98,7 @@ const key = 'test-key';
   const count = 1;
   const child = Object.assign(new EventEmitter(), {
     connected: true,
-    send: function(msg) {
+    _send: function(msg) {
       assert.strictEqual(msg.cmd, 'NODE_SOCKET_GET_COUNT');
       assert.strictEqual(msg.key, key);
       process.nextTick(() =>
@@ -127,7 +127,7 @@ const key = 'test-key';
   const count = 1;
   const child = Object.assign(new EventEmitter(), {
     connected: true,
-    send: function() {
+    _send: function() {
       process.nextTick(() => {
         this.emit('disconnect');
         this.emit('internalMessage', { key, count, cmd: 'NODE_SOCKET_COUNT' });