refactor for sprint

muxer/mplex/muxed_connection_interface.py

@@ -0,0 +1,34 @@
+from abc import ABC, abstractmethod
+
+class IMuxedConn(ABC):
+    """
+    reference: https://github.com/libp2p/go-stream-muxer/blob/master/muxer.go
+    """
+
+    # TODO closer
+
+    @abstractmethod
+    def is_closed(self):
+        """
+        check connection is fully closed
+        :return: true if successful
+        """
+        pass
+
+    @abstractmethod
+    def open_stream(self, protocol_id, stream_name):
+        """
+        creates a new muxed_stream
+        :param protocol_id: id to be associated with stream
+        :param stream_name: name as part of identifier
+        :return: a new stream
+        """
+        pass
+
+    @abstractmethod
+    def accept_stream(self):
+        """
+        accepts a muxed stream opened by the other end
+        :return: the accepted stream
+        """
+        pass