net: remove unconditional getpeername() call

Speeds up http_simple benchmark by about 1.0%

lib/net_uv.js

@@ -342,6 +342,27 @@ Socket.prototype.setEncoding = function(encoding) {
 };
 
 
+Socket.prototype._getpeername = function() {
+  if (!this._handle || !this._handle.getpeername) {
+    return {};
+  }
+  if (!this._peername) {
+    this._peername = this._handle.getpeername();
+  }
+  return this._peername;
+};
+
+
+Socket.prototype.__defineGetter__('remoteAddress', function() {
+  return this._getpeername().address;
+});
+
+
+Socket.prototype.__defineGetter__('remotePort', function() {
+  return this._getpeername().port;
+});
+
+
 Socket.prototype.write = function(data /* [encoding], [fd], [cb] */) {
   var encoding, fd, cb;
 
@@ -693,7 +714,6 @@ Server.prototype.address = function() {
 function onconnection(clientHandle) {
   var handle = this;
   var self = handle.socket;
-  var peername;
 
   debug('onconnection');
 
@@ -707,29 +727,12 @@ function onconnection(clientHandle) {
     return;
   }
 
-  // Todo: implement this for unix sockets
-  if (clientHandle.getpeername) {
-    peername = clientHandle.getpeername();
-    if (!peername.address || !peername.port) {
-      var err = errnoException(errno, 'accept');
-      clientHandle.close();
-      self.emit('error', err);
-      return;
-    }
-  }
-
   var socket = new Socket({
     handle: clientHandle,
     allowHalfOpen: self.allowHalfOpen
   });
   socket.readable = socket.writable = true;
 
-  if (peername) {
-    socket.remoteAddress = peername.address;
-    socket.remotePort = peername.port;
-    // TODO: set family as well
-  }
-
   socket.resume();
 
   self.connections++;