Node.js: socket.js improvements.

- Fixed handling of the "options" parameter in Socket() constructor;
- Now the connect() method returns "this";
- Deduplicated the address() method;
- Added missing "callback" argument to the end() method;
- Now the destroy() method returns "this";
- Added "timeout" argument type check in the setTimeout() method.

src/nodejs/unit-http/socket.js

@@ -12,15 +12,16 @@ const unit_lib = require('unit-http/build/Release/unit-http.node');
 function Socket(options) {
     EventEmitter.call(this);
 
-    if (typeof options === 'number') {
-        options = { fd: options };
+    options = options || {};
 
-    } else if (options === undefined) {
-        options = {};
+    if (typeof options !== 'object') {
+        throw new TypeError('Options must be object');
     }
 
-    this.readable = options.readable !== false;
-    this.writable = options.writable !== false;
+    this.readable = (typeof options.readable === 'boolean' ? options.readable
+                                                           : false);
+    this.writable = (typeof options.writable === 'boolean' ? options.writable
+                                                           : false);
 }
 util.inherits(Socket, EventEmitter);
 
@@ -38,25 +39,24 @@ Socket.prototype.remotePort = 0;
 Socket.prototype.address = function address() {
 };
 
-Socket.prototype.connect = function connect(options, callback) {
-    if (callback !== null) {
-        this.once('connect', cb);
-    }
+Socket.prototype.connect = function connect(options, connectListener) {
+    this.once('connect', connectListener);
 
     this.connecting = true;
     this.writable = true;
-};
 
-Socket.prototype.address = function address() {
+    return this;
 };
 
 Socket.prototype.destroy = function destroy(exception) {
     this.connecting = false;
     this.readable = false;
     this.writable = false;
+
+    return this;
 };
 
-Socket.prototype.end = function end(data, encoding) {
+Socket.prototype.end = function end(data, encoding, callback) {
 };
 
 Socket.prototype.pause = function pause() {
@@ -77,13 +77,15 @@ Socket.prototype.setKeepAlive = function setKeepAlive(enable, initialDelay) {
 Socket.prototype.setNoDelay = function setNoDelay(noDelay) {
 };
 
-Socket.prototype.setTimeout = function setTimeout(msecs, callback) {
-    this.timeout = msecs;
-
-    if (callback) {
-        this.on('timeout', callback);
+Socket.prototype.setTimeout = function setTimeout(timeout, callback) {
+    if (typeof timeout !== 'number') {
+        throw new TypeError('Timeout must be number');
     }
 
+    this.timeout = timeout;
+
+    this.on('timeout', callback);
+
     return this;
 };