Fix wsgi.environment unix socket issue

Author: Sergey Skripnick

aiohttp/wsgi.py

@@ -88,16 +88,22 @@ def create_wsgi_environ(self, message, payload):
         # http://www.ietf.org/rfc/rfc3875
 
         remote = self.transport.get_extra_info('peername')
-        environ['REMOTE_ADDR'] = remote[0]
-        environ['REMOTE_PORT'] = remote[1]
-
-        sockname = self.transport.get_extra_info('sockname')
-        environ['SERVER_PORT'] = str(sockname[1])
-        host = message.headers.get("HOST", None)
-        if host:
-            environ['SERVER_NAME'] = host.split(":")[0]
+        if remote:
+            environ['REMOTE_ADDR'] = remote[0]
+            environ['REMOTE_PORT'] = remote[1]
+            _host, port = self.transport.get_extra_info('sockname')
+            environ['SERVER_PORT'] = str(port)
+            host = message.headers.get("HOST", None)
+            # SERVER_NAME should be set to value of Host header, but this
+            # header is not required. In this case we shoud set it to local
+            # address of socket
+            environ['SERVER_NAME'] = host.split(":")[0] if host else _host
         else:
-            environ['SERVER_NAME'] = sockname[0]
+            # Dealing with unix socket, so request was received from client by
+            # upstream server and this data may be found in the headers
+            for header in ('REMOTE_ADDR', 'REMOTE_PORT',
+                           'SERVER_NAME', 'SERVER_PORT'):
+                environ[header] = message.headers.get(header, '')
 
         path_info = uri_parts.path
         if script_name:

tests/test_wsgi.py

@@ -275,3 +275,16 @@ def test_http_1_0_no_host(self):
         environ = self._make_one()
         self.assertEqual(environ['SERVER_NAME'], '2.3.4.5')
         self.assertEqual(environ['SERVER_PORT'], '80')
+
+    def test_unix_socket(self):
+        self.transport.get_extra_info = unittest.mock.Mock(return_value=None)
+        headers = multidict.MultiDict({
+            'SERVER_NAME': '1.2.3.4', 'SERVER_PORT': '5678',
+            'REMOTE_ADDR': '4.3.2.1', 'REMOTE_PORT': '8765'})
+        self.message = protocol.RawRequestMessage(
+            'GET', '/', (1, 0), headers, True, 'deflate')
+        environ = self._make_one()
+        self.assertEqual(environ['SERVER_NAME'], '1.2.3.4')
+        self.assertEqual(environ['SERVER_PORT'], '5678')
+        self.assertEqual(environ['REMOTE_ADDR'], '4.3.2.1')
+        self.assertEqual(environ['REMOTE_PORT'], '8765')