http: replace uses of self

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_client.js

@@ -66,8 +66,7 @@ function isInvalidPath(s) {
 }
 
 function ClientRequest(options, cb) {
-  var self = this;
-  OutgoingMessage.call(self);
+  OutgoingMessage.call(this);
 
   if (typeof options === 'string') {
     options = url.parse(options);
@@ -95,12 +94,12 @@ function ClientRequest(options, cb) {
       'Agent option must be an instance of http.Agent, undefined or false.'
     );
   }
-  self.agent = agent;
+  this.agent = agent;
 
   var protocol = options.protocol || defaultAgent.protocol;
   var expectedProtocol = defaultAgent.protocol;
-  if (self.agent && self.agent.protocol)
-    expectedProtocol = self.agent.protocol;
+  if (this.agent && this.agent.protocol)
+    expectedProtocol = this.agent.protocol;
 
   var path;
   if (options.path) {
@@ -121,15 +120,15 @@ function ClientRequest(options, cb) {
   }
 
   const defaultPort = options.defaultPort ||
-                      self.agent && self.agent.defaultPort;
+                      this.agent && this.agent.defaultPort;
 
   var port = options.port = options.port || defaultPort || 80;
   var host = options.host = options.hostname || options.host || 'localhost';
 
   var setHost = (options.setHost === undefined);
 
-  self.socketPath = options.socketPath;
-  self.timeout = options.timeout;
+  this.socketPath = options.socketPath;
+  this.timeout = options.timeout;
 
   var method = options.method;
   var methodIsString = (typeof method === 'string');
@@ -141,14 +140,14 @@ function ClientRequest(options, cb) {
     if (!common._checkIsHttpToken(method)) {
       throw new TypeError('Method must be a valid HTTP token');
     }
-    method = self.method = method.toUpperCase();
+    method = this.method = method.toUpperCase();
   } else {
-    method = self.method = 'GET';
+    method = this.method = 'GET';
   }
 
-  self.path = options.path || '/';
+  this.path = options.path || '/';
   if (cb) {
-    self.once('response', cb);
+    this.once('response', cb);
   }
 
   var headersArray = Array.isArray(options.headers);
@@ -157,7 +156,7 @@ function ClientRequest(options, cb) {
       var keys = Object.keys(options.headers);
       for (var i = 0; i < keys.length; i++) {
         var key = keys[i];
-        self.setHeader(key, options.headers[key]);
+        this.setHeader(key, options.headers[key]);
       }
     }
     if (host && !this.getHeader('host') && setHost) {
@@ -190,21 +189,22 @@ function ClientRequest(options, cb) {
       method === 'DELETE' ||
       method === 'OPTIONS' ||
       method === 'CONNECT') {
-    self.useChunkedEncodingByDefault = false;
+    this.useChunkedEncodingByDefault = false;
   } else {
-    self.useChunkedEncodingByDefault = true;
+    this.useChunkedEncodingByDefault = true;
   }
 
   if (headersArray) {
-    self._storeHeader(self.method + ' ' + self.path + ' HTTP/1.1\r\n',
+    this._storeHeader(this.method + ' ' + this.path + ' HTTP/1.1\r\n',
                       options.headers);
-  } else if (self.getHeader('expect')) {
-    if (self._header) {
+  } else if (this.getHeader('expect')) {
+    if (this._header) {
       throw new Error('Can\'t render headers after they are sent to the ' +
                       'client');
     }
-    self._storeHeader(self.method + ' ' + self.path + ' HTTP/1.1\r\n',
-                      self[outHeadersKey]);
+
+    this._storeHeader(this.method + ' ' + this.path + ' HTTP/1.1\r\n',
+                      this[outHeadersKey]);
   }
 
   this._ended = false;
@@ -216,72 +216,65 @@ function ClientRequest(options, cb) {
   this.maxHeadersCount = null;
 
   var called = false;
-  if (self.socketPath) {
-    self._last = true;
-    self.shouldKeepAlive = false;
+
+  const oncreate = (err, socket) => {
+    if (called)
+      return;
+    called = true;
+    if (err) {
+      process.nextTick(() => this.emit('error', err));
+      return;
+    }
+    this.onSocket(socket);
+    this._deferToConnect(null, null, () => this._flush());
+  };
+
+  if (this.socketPath) {
+    this._last = true;
+    this.shouldKeepAlive = false;
     const optionsPath = {
-      path: self.socketPath,
-      timeout: self.timeout
+      path: this.socketPath,
+      timeout: this.timeout
     };
-    const newSocket = self.agent.createConnection(optionsPath, oncreate);
+    const newSocket = this.agent.createConnection(optionsPath, oncreate);
     if (newSocket && !called) {
       called = true;
-      self.onSocket(newSocket);
+      this.onSocket(newSocket);
     } else {
       return;
     }
-  } else if (self.agent) {
+  } else if (this.agent) {
     // If there is an agent we should default to Connection:keep-alive,
     // but only if the Agent will actually reuse the connection!
     // If it's not a keepAlive agent, and the maxSockets==Infinity, then
     // there's never a case where this socket will actually be reused
-    if (!self.agent.keepAlive && !Number.isFinite(self.agent.maxSockets)) {
-      self._last = true;
-      self.shouldKeepAlive = false;
+    if (!this.agent.keepAlive && !Number.isFinite(this.agent.maxSockets)) {
+      this._last = true;
+      this.shouldKeepAlive = false;
     } else {
-      self._last = false;
-      self.shouldKeepAlive = true;
+      this._last = false;
+      this.shouldKeepAlive = true;
     }
-    self.agent.addRequest(self, options);
+    this.agent.addRequest(this, options);
   } else {
     // No agent, default to Connection:close.
-    self._last = true;
-    self.shouldKeepAlive = false;
+    this._last = true;
+    this.shouldKeepAlive = false;
     if (typeof options.createConnection === 'function') {
       const newSocket = options.createConnection(options, oncreate);
       if (newSocket && !called) {
         called = true;
-        self.onSocket(newSocket);
+        this.onSocket(newSocket);
       } else {
         return;
       }
     } else {
       debug('CLIENT use net.createConnection', options);
-      self.onSocket(net.createConnection(options));
-    }
-  }
-
-  function oncreate(err, socket) {
-    if (called)
-      return;
-    called = true;
-    if (err) {
-      process.nextTick(function() {
-        self.emit('error', err);
-      });
-      return;
+      this.onSocket(net.createConnection(options));
     }
-    self.onSocket(socket);
-    self._deferToConnect(null, null, function() {
-      self._flush();
-      self = null;
-    });
   }
 
-  self._deferToConnect(null, null, function() {
-    self._flush();
-    self = null;
-  });
+  this._deferToConnect(null, null, () => this._flush());
 }
 
 util.inherits(ClientRequest, OutgoingMessage);
@@ -304,7 +297,7 @@ ClientRequest.prototype._implicitHeader = function _implicitHeader() {
 
 ClientRequest.prototype.abort = function abort() {
   if (!this.aborted) {
-    process.nextTick(emitAbortNT, this);
+    process.nextTick(emitAbortNT.bind(this));
   }
   // Mark as aborting so we can avoid sending queued request data
   // This is used as a truthy flag elsewhere. The use of Date.now is for
@@ -328,8 +321,8 @@ ClientRequest.prototype.abort = function abort() {
 };
 
 
-function emitAbortNT(self) {
-  self.emit('abort');
+function emitAbortNT() {
+  this.emit('abort');
 }
 
 
@@ -681,26 +674,25 @@ function _deferToConnect(method, arguments_, cb) {
   // calls that happen either now (when a socket is assigned) or
   // in the future (when a socket gets assigned out of the pool and is
   // eventually writable).
-  var self = this;
 
-  function callSocketMethod() {
+  const callSocketMethod = () => {
     if (method)
-      self.socket[method].apply(self.socket, arguments_);
+      this.socket[method].apply(this.socket, arguments_);
 
     if (typeof cb === 'function')
       cb();
-  }
+  };
 
-  var onSocket = function onSocket() {
-    if (self.socket.writable) {
+  const onSocket = () => {
+    if (this.socket.writable) {
       callSocketMethod();
     } else {
-      self.socket.once('connect', callSocketMethod);
+      this.socket.once('connect', callSocketMethod);
     }
   };
 
-  if (!self.socket) {
-    self.once('socket', onSocket);
+  if (!this.socket) {
+    this.once('socket', onSocket);
   } else {
     onSocket();
   }
@@ -709,10 +701,7 @@ function _deferToConnect(method, arguments_, cb) {
 ClientRequest.prototype.setTimeout = function setTimeout(msecs, callback) {
   if (callback) this.once('timeout', callback);
 
-  var self = this;
-  function emitTimeout() {
-    self.emit('timeout');
-  }
+  const emitTimeout = () => this.emit('timeout');
 
   if (this.socket && this.socket.writable) {
     if (this.timeoutCb)

lib/_http_outgoing.js

@@ -625,7 +625,7 @@ const crlf_buf = Buffer.from('\r\n');
 OutgoingMessage.prototype.write = function write(chunk, encoding, callback) {
   if (this.finished) {
     var err = new Error('write after end');
-    process.nextTick(writeAfterEndNT, this, err, callback);
+    process.nextTick(writeAfterEndNT.bind(this), err, callback);
 
     return true;
   }
@@ -684,8 +684,8 @@ OutgoingMessage.prototype.write = function write(chunk, encoding, callback) {
 };
 
 
-function writeAfterEndNT(self, err, callback) {
-  self.emit('error', err);
+function writeAfterEndNT(err, callback) {
+  this.emit('error', err);
   if (callback) callback(err);
 }