http: reduce duplicated code for cleaning parser

PR-URL: #23351
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: starkwang

lib/_http_common.js

@@ -151,22 +151,13 @@ function parserOnMessageComplete() {
 const parsers = new FreeList('parsers', 1000, function parsersCb() {
   const parser = new HTTPParser(HTTPParser.REQUEST);
 
-  parser._headers = [];
-  parser._url = '';
-  parser._consumed = false;
-
-  parser.socket = null;
-  parser.incoming = null;
-  parser.outgoing = null;
-
-  parser.maxHeaderPairs = MAX_HEADER_PAIRS;
+  cleanParser(parser);
 
   parser.onIncoming = null;
   parser[kOnHeaders] = parserOnHeaders;
   parser[kOnHeadersComplete] = parserOnHeadersComplete;
   parser[kOnBody] = parserOnBody;
   parser[kOnMessageComplete] = parserOnMessageComplete;
-  parser[kOnExecute] = null;
 
   return parser;
 });
@@ -182,17 +173,9 @@ function closeParserInstance(parser) { parser.close(); }
 // should be all that is needed.
 function freeParser(parser, req, socket) {
   if (parser) {
-    parser._headers = [];
-    parser._url = '';
-    parser.maxHeaderPairs = MAX_HEADER_PAIRS;
-    parser.onIncoming = null;
     if (parser._consumed)
       parser.unconsume();
-    parser._consumed = false;
-    parser.socket = null;
-    parser.incoming = null;
-    parser.outgoing = null;
-    parser[kOnExecute] = null;
+    cleanParser(parser);
     if (parsers.free(parser) === false) {
       // Make sure the parser's stack has unwound before deleting the
       // corresponding C++ object through .close().
@@ -238,6 +221,17 @@ function checkInvalidHeaderChar(val) {
   return headerCharRegex.test(val);
 }
 
+function cleanParser(parser) {
+  parser._headers = [];
+  parser._url = '';
+  parser.socket = null;
+  parser.incoming = null;
+  parser.outgoing = null;
+  parser.maxHeaderPairs = MAX_HEADER_PAIRS;
+  parser[kOnExecute] = null;
+  parser._consumed = false;
+}
+
 module.exports = {
   _checkInvalidHeaderChar: checkInvalidHeaderChar,
   _checkIsHttpToken: checkIsHttpToken,