Simplify request ip and port retrieval logic

This change also ensures that cases where transport stream is
already closed is handled gracefully.

sanic/request.py

@@ -1,6 +1,5 @@
 import sys
 import json
-import socket
 from cgi import parse_header
 from collections import namedtuple
 from http.cookies import SimpleCookie
@@ -192,18 +191,10 @@ class Request(dict):
         return self._socket
 
     def _get_address(self):
-        sock = self.transport.get_extra_info('socket')
-
-        if sock.family == socket.AF_INET:
-            self._socket = (self.transport.get_extra_info('peername') or
-                            (None, None))
-            self._ip, self._port = self._socket
-        elif sock.family == socket.AF_INET6:
-            self._socket = (self.transport.get_extra_info('peername') or
-                            (None, None, None, None))
-            self._ip, self._port, *_ = self._socket
-        else:
-            self._ip, self._port = (None, None)
+        self._socket = self.transport.get_extra_info('peername') or \
+                        (None, None)
+        self._ip = self._socket[0]
+        self._port = self._socket[1]
 
     @property
     def remote_addr(self):