Added transport() method

engineio/server.py

@@ -169,6 +169,16 @@ def disconnect(self, sid=None):
                 client.close()
             self.sockets = {}
 
+    def transport(self, sid):
+        """Return the name of the transport used by the client.
+
+        The two possible values returned by this function are ``'polling'``
+        and ``'websocket'``.
+
+        :param sid: The session of the client.
+        """
+        return 'websocket' if self._get_socket(sid).upgraded else 'polling'
+
     def handle_request(self, environ, start_response):
         """Handle an HTTP request from the client.
 

tests/test_server.py

@@ -204,6 +204,15 @@ def test_upgrades(self):
         s.sockets['foo'].upgraded = True
         self.assertEqual(s._upgrades('foo'), [])
 
+    def test_transport(self):
+        s = server.Server()
+        s.sockets['foo'] = self._get_mock_socket()
+        s.sockets['foo'].upgraded = False
+        s.sockets['bar'] = self._get_mock_socket()
+        s.sockets['bar'].upgraded = True
+        self.assertEqual(s.transport('foo'), 'polling')
+        self.assertEqual(s.transport('bar'), 'websocket')
+
     def test_bad_session(self):
         s = server.Server()
         s.sockets['foo'] = 'client'