Migrate to new project structure.

libp2p/protocol_muxer/multiselect_communicator_interface.py

@@ -0,0 +1,22 @@
+from abc import ABC, abstractmethod
+
+
+class IMultiselectCommunicator(ABC):
+    """
+    Communicator helper class that ensures both the client
+    and multistream module will follow the same multistream protocol,
+    which is necessary for them to work
+    """
+
+    @abstractmethod
+    def write(self, msg_str):
+        """
+        Write message to stream
+        :param msg_str: message to write
+        """
+
+    @abstractmethod
+    def read_stream_until_eof(self):
+        """
+        Reads message from stream until EOF
+        """