fixed memory leak on rejected connections for asyncio

socketio/asyncio_server.py

@@ -258,6 +258,8 @@ class AsyncServer(server.Server):
             self.manager.disconnect(sid, namespace)
             await self._send_packet(sid, packet.Packet(packet.ERROR,
                                                        namespace=namespace))
+            if sid in self.environ:  # pragma: no cover
+                del self.environ[sid]
             return False
         else:
             await self._send_packet(sid, packet.Packet(packet.CONNECT,

tests/test_asyncio_server.py

@@ -267,6 +267,7 @@ class TestAsyncServer(unittest.TestCase):
         handler.assert_called_once_with('123', 'environ')
         self.assertEqual(s.manager.connect.call_count, 1)
         self.assertEqual(s.manager.disconnect.call_count, 1)
+        self.assertEqual(s.environ, {})
         s.eio.send.mock.assert_called_once_with('123', '4', binary=False)
 
     def test_handle_connect_namespace_rejected(self, eio):
@@ -279,6 +280,7 @@ class TestAsyncServer(unittest.TestCase):
         _run(s._handle_eio_message('123', '0/foo'))
         self.assertEqual(s.manager.connect.call_count, 2)
         self.assertEqual(s.manager.disconnect.call_count, 1)
+        self.assertEqual(s.environ, {})
         s.eio.send.mock.assert_any_call('123', '4/foo', binary=False)
 
     def test_handle_disconnect(self, eio):