http: improve outgoing string write performance

PR-URL: https://github.com/nodejs/node/pull/13013
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/_http_outgoing.js

@@ -78,6 +78,9 @@ utcDate._onTimeout = function _onTimeout() {
 };
 
 
+function noopPendingOutput(amount) {}
+
+
 function OutgoingMessage() {
   Stream.call(this);
 
@@ -117,7 +120,7 @@ function OutgoingMessage() {
   this._header = null;
   this[outHeadersKey] = null;
 
-  this._onPendingData = null;
+  this._onPendingData = noopPendingOutput;
 }
 util.inherits(OutgoingMessage, Stream);
 
@@ -234,12 +237,18 @@ OutgoingMessage.prototype._send = function _send(data, encoding, callback) {
         (encoding === 'utf8' || encoding === 'latin1' || !encoding)) {
       data = this._header + data;
     } else {
-      this.output.unshift(this._header);
-      this.outputEncodings.unshift('latin1');
-      this.outputCallbacks.unshift(null);
-      this.outputSize += this._header.length;
-      if (typeof this._onPendingData === 'function')
-        this._onPendingData(this._header.length);
+      var header = this._header;
+      if (this.output.length === 0) {
+        this.output = [header];
+        this.outputEncodings = ['latin1'];
+        this.outputCallbacks = [null];
+      } else {
+        this.output.unshift(header);
+        this.outputEncodings.unshift('latin1');
+        this.outputCallbacks.unshift(null);
+      }
+      this.outputSize += header.length;
+      this._onPendingData(header.length);
     }
     this._headerSent = true;
   }
@@ -275,19 +284,13 @@ function _writeRaw(data, encoding, callback) {
     return conn.write(data, encoding, callback);
   }
   // Buffer, as long as we're not destroyed.
-  return this._buffer(data, encoding, callback);
-}
-
-
-OutgoingMessage.prototype._buffer = function _buffer(data, encoding, callback) {
   this.output.push(data);
   this.outputEncodings.push(encoding);
   this.outputCallbacks.push(callback);
   this.outputSize += data.length;
-  if (typeof this._onPendingData === 'function')
-    this._onPendingData(data.length);
+  this._onPendingData(data.length);
   return false;
-};
+}
 
 
 OutgoingMessage.prototype._storeHeader = _storeHeader;
@@ -624,27 +627,31 @@ Object.defineProperty(OutgoingMessage.prototype, 'headersSent', {
 
 const crlf_buf = Buffer.from('\r\n');
 OutgoingMessage.prototype.write = function write(chunk, encoding, callback) {
-  if (this.finished) {
+  return write_(this, chunk, encoding, callback, false);
+};
+
+function write_(msg, chunk, encoding, callback, fromEnd) {
+  if (msg.finished) {
     var err = new Error('write after end');
-    nextTick(this.socket[async_id_symbol],
-             writeAfterEndNT.bind(this),
+    nextTick(msg.socket[async_id_symbol],
+             writeAfterEndNT.bind(msg),
              err,
              callback);
 
     return true;
   }
 
-  if (!this._header) {
-    this._implicitHeader();
+  if (!msg._header) {
+    msg._implicitHeader();
   }
 
-  if (!this._hasBody) {
+  if (!msg._hasBody) {
     debug('This type of response MUST NOT have a body. ' +
           'Ignoring write() calls.');
     return true;
   }
 
-  if (typeof chunk !== 'string' && !(chunk instanceof Buffer)) {
+  if (!fromEnd && typeof chunk !== 'string' && !(chunk instanceof Buffer)) {
     throw new TypeError('First argument must be a string or Buffer');
   }
 
@@ -654,38 +661,28 @@ OutgoingMessage.prototype.write = function write(chunk, encoding, callback) {
   if (chunk.length === 0) return true;
 
   var len, ret;
-  if (this.chunkedEncoding) {
-    if (typeof chunk === 'string' &&
-        encoding !== 'hex' &&
-        encoding !== 'base64' &&
-        encoding !== 'latin1') {
+  if (msg.chunkedEncoding) {
+    if (typeof chunk === 'string')
       len = Buffer.byteLength(chunk, encoding);
-      chunk = len.toString(16) + CRLF + chunk + CRLF;
-      ret = this._send(chunk, encoding, callback);
-    } else {
-      // buffer, or a non-toString-friendly encoding
-      if (typeof chunk === 'string')
-        len = Buffer.byteLength(chunk, encoding);
-      else
-        len = chunk.length;
-
-      if (this.connection && !this.connection.corked) {
-        this.connection.cork();
-        process.nextTick(connectionCorkNT, this.connection);
-      }
+    else
+      len = chunk.length;
 
-      this._send(len.toString(16), 'latin1', null);
-      this._send(crlf_buf, null, null);
-      this._send(chunk, encoding, null);
-      ret = this._send(crlf_buf, null, callback);
+    if (msg.connection && !msg.connection.corked) {
+      msg.connection.cork();
+      process.nextTick(connectionCorkNT, msg.connection);
     }
+
+    msg._send(len.toString(16), 'latin1', null);
+    msg._send(crlf_buf, null, null);
+    msg._send(chunk, encoding, null);
+    ret = msg._send(crlf_buf, null, callback);
   } else {
-    ret = this._send(chunk, encoding, callback);
+    ret = msg._send(chunk, encoding, callback);
   }
 
   debug('write ret = ' + ret);
   return ret;
-};
+}
 
 
 function writeAfterEndNT(err, callback) {
@@ -736,49 +733,40 @@ function onFinish(outmsg) {
   outmsg.emit('finish');
 }
 
-OutgoingMessage.prototype.end = function end(data, encoding, callback) {
-  if (typeof data === 'function') {
-    callback = data;
-    data = null;
+OutgoingMessage.prototype.end = function end(chunk, encoding, callback) {
+  if (typeof chunk === 'function') {
+    callback = chunk;
+    chunk = null;
   } else if (typeof encoding === 'function') {
     callback = encoding;
     encoding = null;
   }
 
-  if (data && typeof data !== 'string' && !(data instanceof Buffer)) {
-    throw new TypeError('First argument must be a string or Buffer');
-  }
-
   if (this.finished) {
     return false;
   }
 
-  if (!this._header) {
-    if (data) {
-      if (typeof data === 'string')
-        this._contentLength = Buffer.byteLength(data, encoding);
+  var uncork;
+  if (chunk) {
+    if (typeof chunk !== 'string' && !(chunk instanceof Buffer)) {
+      throw new TypeError('First argument must be a string or Buffer');
+    }
+    if (!this._header) {
+      if (typeof chunk === 'string')
+        this._contentLength = Buffer.byteLength(chunk, encoding);
       else
-        this._contentLength = data.length;
-    } else {
-      this._contentLength = 0;
+        this._contentLength = chunk.length;
+    }
+    if (this.connection) {
+      this.connection.cork();
+      uncork = true;
     }
+    write_(this, chunk, encoding, null, true);
+  } else if (!this._header) {
+    this._contentLength = 0;
     this._implicitHeader();
   }
 
-  if (data && !this._hasBody) {
-    debug('This type of response MUST NOT have a body. ' +
-          'Ignoring data passed to end().');
-    data = null;
-  }
-
-  if (this.connection && data)
-    this.connection.cork();
-
-  if (data) {
-    // Normal body write.
-    this.write(data, encoding);
-  }
-
   if (typeof callback === 'function')
     this.once('finish', callback);
 
@@ -792,7 +780,7 @@ OutgoingMessage.prototype.end = function end(data, encoding, callback) {
     ret = this._send('', 'latin1', finish);
   }
 
-  if (this.connection && data)
+  if (uncork)
     this.connection.uncork();
 
   this.finished = true;
@@ -871,8 +859,7 @@ OutgoingMessage.prototype._flushOutput = function _flushOutput(socket) {
   this.output = [];
   this.outputEncodings = [];
   this.outputCallbacks = [];
-  if (typeof this._onPendingData === 'function')
-    this._onPendingData(-this.outputSize);
+  this._onPendingData(-this.outputSize);
   this.outputSize = 0;
 
   return ret;

test/parallel/test-http-abort-client.js

@@ -23,12 +23,12 @@
 const common = require('../common');
 const http = require('http');
 
+let serverRes;
 const server = http.Server(function(req, res) {
   console.log('Server accepted request.');
+  serverRes = res;
   res.writeHead(200);
   res.write('Part of my res.');
-
-  res.destroy();
 });
 
 server.listen(0, common.mustCall(function() {
@@ -37,6 +37,7 @@ server.listen(0, common.mustCall(function() {
     headers: { connection: 'keep-alive' }
   }, common.mustCall(function(res) {
     server.close();
+    serverRes.destroy();
 
     console.log(`Got res: ${res.statusCode}`);
     console.dir(res.headers);

test/parallel/test-http-client-aborted-event.js

@@ -2,9 +2,10 @@
 const common = require('../common');
 const http = require('http');
 
+let serverRes;
 const server = http.Server(function(req, res) {
   res.write('Part of my res.');
-  res.destroy();
+  serverRes = res;
 });
 
 server.listen(0, common.mustCall(function() {
@@ -13,6 +14,7 @@ server.listen(0, common.mustCall(function() {
     headers: { connection: 'keep-alive' }
   }, common.mustCall(function(res) {
     server.close();
+    serverRes.destroy();
     res.on('aborted', common.mustCall());
   }));
 }));