http: use more efficient module.exports pattern

PR-URL: https://github.com/nodejs/node/pull/11594
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

lib/_http_agent.js

@@ -105,7 +105,6 @@ function Agent(options) {
 }
 
 util.inherits(Agent, EventEmitter);
-exports.Agent = Agent;
 
 Agent.defaultMaxSockets = Infinity;
 
@@ -314,4 +313,7 @@ Agent.prototype.destroy = function destroy() {
   }
 };
 
-exports.globalAgent = new Agent();
+module.exports = {
+  Agent,
+  globalAgent: new Agent()
+};

lib/_http_client.js

@@ -286,7 +286,6 @@ function ClientRequest(options, cb) {
 
 util.inherits(ClientRequest, OutgoingMessage);
 
-exports.ClientRequest = ClientRequest;
 
 ClientRequest.prototype._finish = function _finish() {
   DTRACE_HTTP_CLIENT_REQUEST(this, this.connection);
@@ -752,3 +751,7 @@ ClientRequest.prototype.setSocketKeepAlive =
 ClientRequest.prototype.clearTimeout = function clearTimeout(cb) {
   this.setTimeout(0, cb);
 };
+
+module.exports = {
+  ClientRequest
+};

lib/_http_common.js

@@ -32,12 +32,6 @@ const readStart = incoming.readStart;
 const readStop = incoming.readStop;
 
 const debug = require('util').debuglog('http');
-exports.debug = debug;
-
-exports.CRLF = '\r\n';
-exports.chunkExpression = /(?:^|\W)chunked(?:$|\W)/i;
-exports.continueExpression = /(?:^|\W)100-continue(?:$|\W)/i;
-exports.methods = methods;
 
 const kOnHeaders = HTTPParser.kOnHeaders | 0;
 const kOnHeadersComplete = HTTPParser.kOnHeadersComplete | 0;
@@ -194,7 +188,6 @@ var parsers = new FreeList('parsers', 1000, function() {
 
   return parser;
 });
-exports.parsers = parsers;
 
 
 // Free the parser and also break any links that it
@@ -227,7 +220,6 @@ function freeParser(parser, req, socket) {
     socket.parser = null;
   }
 }
-exports.freeParser = freeParser;
 
 
 function ondrain() {
@@ -239,7 +231,6 @@ function httpSocketSetup(socket) {
   socket.removeListener('drain', ondrain);
   socket.on('drain', ondrain);
 }
-exports.httpSocketSetup = httpSocketSetup;
 
 /**
  * Verifies that the given val is a valid HTTP token
@@ -306,7 +297,6 @@ function checkIsHttpToken(val) {
   }
   return true;
 }
-exports._checkIsHttpToken = checkIsHttpToken;
 
 /**
  * True if val contains an invalid field-vchar
@@ -360,4 +350,16 @@ function checkInvalidHeaderChar(val) {
   }
   return false;
 }
-exports._checkInvalidHeaderChar = checkInvalidHeaderChar;
+
+module.exports = {
+  _checkInvalidHeaderChar: checkInvalidHeaderChar,
+  _checkIsHttpToken: checkIsHttpToken,
+  chunkExpression: /(?:^|\W)chunked(?:$|\W)/i,
+  continueExpression: /(?:^|\W)100-continue(?:$|\W)/i,
+  CRLF: '\r\n',
+  debug,
+  freeParser,
+  httpSocketSetup,
+  methods,
+  parsers
+};

lib/_http_incoming.js

@@ -28,14 +28,11 @@ function readStart(socket) {
   if (socket && !socket._paused && socket.readable)
     socket.resume();
 }
-exports.readStart = readStart;
 
 function readStop(socket) {
   if (socket)
     socket.pause();
 }
-exports.readStop = readStop;
-
 
 /* Abstract base class for ServerRequest and ClientResponse. */
 function IncomingMessage(socket) {
@@ -83,9 +80,6 @@ function IncomingMessage(socket) {
 util.inherits(IncomingMessage, Stream.Readable);
 
 
-exports.IncomingMessage = IncomingMessage;
-
-
 IncomingMessage.prototype.setTimeout = function setTimeout(msecs, callback) {
   if (callback)
     this.on('timeout', callback);
@@ -324,3 +318,9 @@ IncomingMessage.prototype._dump = function _dump() {
     this.resume();
   }
 };
+
+module.exports = {
+  IncomingMessage,
+  readStart,
+  readStop
+};

lib/_http_outgoing.js

@@ -887,3 +887,8 @@ OutgoingMessage.prototype.flushHeaders = function flushHeaders() {
 OutgoingMessage.prototype.flush = internalUtil.deprecate(function() {
   this.flushHeaders();
 }, 'OutgoingMessage.flush is deprecated. Use flushHeaders instead.', 'DEP0001');
+
+
+module.exports = {
+  OutgoingMessage
+};

lib/_http_server.js

@@ -36,7 +36,7 @@ const httpSocketSetup = common.httpSocketSetup;
 const OutgoingMessage = require('_http_outgoing').OutgoingMessage;
 const outHeadersKey = require('internal/http').outHeadersKey;
 
-const STATUS_CODES = exports.STATUS_CODES = {
+const STATUS_CODES = {
   100: 'Continue',
   101: 'Switching Protocols',
   102: 'Processing',                 // RFC 2518, obsoleted by RFC 4918
@@ -128,8 +128,6 @@ ServerResponse.prototype._finish = function _finish() {
 };
 
 
-exports.ServerResponse = ServerResponse;
-
 ServerResponse.prototype.statusCode = 200;
 ServerResponse.prototype.statusMessage = undefined;
 
@@ -290,9 +288,6 @@ Server.prototype.setTimeout = function setTimeout(msecs, callback) {
 };
 
 
-exports.Server = Server;
-
-
 function connectionListener(socket) {
   debug('SERVER new http connection');
 
@@ -363,7 +358,7 @@ function connectionListener(socket) {
 
   socket._paused = false;
 }
-exports._connectionListener = connectionListener;
+
 
 function updateOutgoingData(socket, state, delta) {
   state.outgoingData += delta;
@@ -640,3 +635,10 @@ function socketOnWrap(ev, fn) {
 
   return res;
 }
+
+module.exports = {
+  STATUS_CODES,
+  Server,
+  ServerResponse,
+  _connectionListener: connectionListener
+};

lib/http.js

@@ -20,35 +20,43 @@
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 'use strict';
-exports.IncomingMessage = require('_http_incoming').IncomingMessage;
-
-exports.OutgoingMessage = require('_http_outgoing').OutgoingMessage;
-
-exports.METHODS = require('_http_common').methods.slice().sort();
 
 const agent = require('_http_agent');
-exports.Agent = agent.Agent;
-exports.globalAgent = agent.globalAgent;
-
-const server = require('_http_server');
-exports.ServerResponse = server.ServerResponse;
-exports.STATUS_CODES = server.STATUS_CODES;
-exports._connectionListener = server._connectionListener;
-const Server = exports.Server = server.Server;
-
-exports.createServer = function createServer(requestListener) {
-  return new Server(requestListener);
-};
-
 const client = require('_http_client');
-const ClientRequest = exports.ClientRequest = client.ClientRequest;
+const common = require('_http_common');
+const incoming = require('_http_incoming');
+const outgoing = require('_http_outgoing');
+const server = require('_http_server');
 
-exports.request = function request(options, cb) {
+const Server = server.Server;
+const ClientRequest = client.ClientRequest;
+
+function createServer(requestListener) {
+  return new Server(requestListener);
+}
+
+function request(options, cb) {
   return new ClientRequest(options, cb);
-};
+}
 
-exports.get = function get(options, cb) {
-  var req = exports.request(options, cb);
+function get(options, cb) {
+  var req = request(options, cb);
   req.end();
   return req;
+}
+
+module.exports = {
+  _connectionListener: server._connectionListener,
+  METHODS: common.methods.slice().sort(),
+  STATUS_CODES: server.STATUS_CODES,
+  Agent: agent.Agent,
+  ClientRequest,
+  globalAgent: agent.globalAgent,
+  IncomingMessage: incoming.IncomingMessage,
+  OutgoingMessage: outgoing.OutgoingMessage,
+  Server,
+  ServerResponse: server.ServerResponse,
+  createServer,
+  get,
+  request
 };