Migrate to new project structure.

libp2p/protocol_muxer/multiselect_muxer_interface.py

@@ -0,0 +1,26 @@
+from abc import ABC, abstractmethod
+
+
+class IMultiselectMuxer(ABC):
+    """
+    Multiselect module that is responsible for responding to
+    a multiselect client and deciding on
+    a specific protocol and handler pair to use for communication
+    """
+
+    @abstractmethod
+    def add_handler(self, protocol, handler):
+        """
+        Store the handler with the given protocol
+        :param protocol: protocol name
+        :param handler: handler function
+        """
+
+    @abstractmethod
+    def negotiate(self, stream):
+        """
+        Negotiate performs protocol selection
+        :param stream: stream to negotiate on
+        :return: selected protocol name, handler function
+        :raise Exception: negotiation failed exception
+        """