net: rework autoSelectFamily implementation

PR-URL: #46587
Backport-PR-URL: #49183
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/net.md

@@ -935,7 +935,7 @@ For TCP connections, available `options` are:
 * `autoSelectFamilyAttemptTimeout` {number}: The amount of time in milliseconds to wait
   for a connection attempt to finish before trying the next address when using the `autoSelectFamily` option.
   If set to a positive integer less than `10`, then the value `10` will be used instead.
-  **Default:** `250`.
+  **Default:** initially `250`, but it can be changed at runtime using [`net.setDefaultAutoSelectFamilyAttemptTimeout(value)`][]
 
 For [IPC][] connections, available `options` are:
 
@@ -1520,26 +1520,6 @@ immediately initiates connection with
 [`socket.connect(port[, host][, connectListener])`][`socket.connect(port)`],
 then returns the `net.Socket` that starts the connection.
 
-## `net.setDefaultAutoSelectFamily(value)`
-
-<!-- YAML
-added: REPLACEME
--->
-
-Sets the default value of the `autoSelectFamily` option of [`socket.connect(options)`][].
-
-* `value` {boolean} The new default value. The initial default value is `false`.
-
-## `net.getDefaultAutoSelectFamily()`
-
-<!-- YAML
-added: REPLACEME
--->
-
-Gets the current default value of the `autoSelectFamily` option of [`socket.connect(options)`][].
-
-* Returns: {boolean} The current default value of the `autoSelectFamily` option.
-
 ## `net.createServer([options][, connectionListener])`
 
 <!-- YAML
@@ -1640,6 +1620,47 @@ Use `nc` to connect to a Unix domain socket server:
 $ nc -U /tmp/echo.sock
 ```
 
+## `net.getDefaultAutoSelectFamily()`
+
+<!-- YAML
+added: v19.4.0
+-->
+
+Gets the current default value of the `autoSelectFamily` option of [`socket.connect(options)`][].
+
+* Returns: {boolean} The current default value of the `autoSelectFamily` option.
+
+## `net.setDefaultAutoSelectFamily(value)`
+
+<!-- YAML
+added: v19.4.0
+-->
+
+Sets the default value of the `autoSelectFamily` option of [`socket.connect(options)`][].
+
+* `value` {boolean} The new default value. The initial default value is `false`.
+
+## `net.getDefaultAutoSelectFamilyAttemptTimeout()`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+Gets the current default value of the `autoSelectFamilyAttemptTimeout` option of [`socket.connect(options)`][].
+
+* Returns: {number} The current default value of the `autoSelectFamilyAttemptTimeout` option.
+
+## `net.setDefaultAutoSelectFamilyAttemptTimeout(value)`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+Sets the default value of the `autoSelectFamilyAttemptTimeout` option of [`socket.connect(options)`][].
+
+* `value` {number} The new default value, which must be a positive number. If the number is less than `10`,
+  the value `10` is used insted The initial default value is `250`.
+
 ## `net.isIP(input)`
 
 <!-- YAML
@@ -1725,6 +1746,7 @@ net.isIPv6('fhqwhgads'); // returns false
 [`net.createConnection(port, host)`]: #netcreateconnectionport-host-connectlistener
 [`net.createServer()`]: #netcreateserveroptions-connectionlistener
 [`net.setDefaultAutoSelectFamily(value)`]: #netsetdefaultautoselectfamilyvalue
+[`net.setDefaultAutoSelectFamilyAttemptTimeout(value)`]: #netsetdefaultautoselectfamilyattempttimeoutvalue
 [`new net.Socket(options)`]: #new-netsocketoptions
 [`readable.setEncoding()`]: stream.md#readablesetencodingencoding
 [`server.close()`]: #serverclosecallback

lib/_tls_wrap.js

@@ -54,7 +54,7 @@ const EE = require('events');
 const net = require('net');
 const tls = require('tls');
 const common = require('_tls_common');
-const { kWrapConnectedHandle } = require('internal/net');
+const { kReinitializeHandle } = require('internal/net');
 const JSStreamSocket = require('internal/js_stream_socket');
 const { Buffer } = require('buffer');
 let debug = require('internal/util/debuglog').debuglog('tls', (fn) => {
@@ -633,14 +633,27 @@ TLSSocket.prototype._wrapHandle = function(wrap, handle) {
   return res;
 };
 
-TLSSocket.prototype[kWrapConnectedHandle] = function(handle) {
-  this._handle = this._wrapHandle(null, handle);
+TLSSocket.prototype[kReinitializeHandle] = function reinitializeHandle(handle) {
+  const originalServername = this._handle.getServername();
+  const originalSession = this._handle.getSession();
+
+  this.handle = this._wrapHandle(null, handle);
   this.ssl = this._handle;
+
+  net.Socket.prototype[kReinitializeHandle].call(this, this.handle);
   this._init();
 
   if (this._tlsOptions.enableTrace) {
     this._handle.enableTrace();
   }
+
+  if (originalSession) {
+    this.setSession(originalSession);
+  }
+
+  if (originalServername) {
+    this.setServername(originalServername);
+  }
 };
 
 // This eliminates a cyclic reference to TLSWrap
@@ -679,6 +692,30 @@ TLSSocket.prototype._destroySSL = function _destroySSL() {
   this[kIsVerified] = false;
 };
 
+function keylogNewListener(event) {
+  if (event !== 'keylog')
+    return;
+
+  // Guard against enableKeylogCallback after destroy
+  if (!this._handle) return;
+  this._handle.enableKeylogCallback();
+
+  // Remove this listener since it's no longer needed.
+  this.removeListener('newListener', keylogNewListener);
+}
+
+function newListener(event) {
+  if (event !== 'session')
+    return;
+
+  // Guard against enableSessionCallbacks after destroy
+  if (!this._handle) return;
+  this._handle.enableSessionCallbacks();
+
+  // Remove this listener since it's no longer needed.
+  this.removeListener('newListener', newListener);
+}
+
 // Constructor guts, arbitrarily factored out.
 let warnOnTlsKeylog = true;
 let warnOnTlsKeylogError = true;
@@ -704,18 +741,9 @@ TLSSocket.prototype._init = function(socket, wrap) {
 
   // Only call .onkeylog if there is a keylog listener.
   ssl.onkeylog = onkeylog;
-  this.on('newListener', keylogNewListener);
 
-  function keylogNewListener(event) {
-    if (event !== 'keylog')
-      return;
-
-    // Guard against enableKeylogCallback after destroy
-    if (!this._handle) return;
-    this._handle.enableKeylogCallback();
-
-    // Remove this listener since it's no longer needed.
-    this.removeListener('newListener', keylogNewListener);
+  if (this.listenerCount('newListener', keylogNewListener) === 0) {
+    this.on('newListener', keylogNewListener);
   }
 
   if (options.isServer) {
@@ -750,18 +778,8 @@ TLSSocket.prototype._init = function(socket, wrap) {
     ssl.onnewsession = onnewsessionclient;
 
     // Only call .onnewsession if there is a session listener.
-    this.on('newListener', newListener);
-
-    function newListener(event) {
-      if (event !== 'session')
-        return;
-
-      // Guard against enableSessionCallbacks after destroy
-      if (!this._handle) return;
-      this._handle.enableSessionCallbacks();
-
-      // Remove this listener since it's no longer needed.
-      this.removeListener('newListener', newListener);
+    if (this.listenerCount('newListener', newListener) === 0) {
+      this.on('newListener', newListener);
     }
   }
 

lib/internal/net.js

@@ -67,7 +67,7 @@ function makeSyncWrite(fd) {
 }
 
 module.exports = {
-  kWrapConnectedHandle: Symbol('wrapConnectedHandle'),
+  kReinitializeHandle: Symbol('reinitializeHandle'),
   isIP,
   isIPv4,
   isIPv6,