Security: SecureSession

Make security sessions(secio, noise) share the same implementation
`BaseSession` to avoid duplicate implementation of buffered read.

libp2p/io/abc.py

@@ -2,6 +2,7 @@ from abc import ABC, abstractmethod
 
 
 class Closer(ABC):
+    @abstractmethod
     async def close(self) -> None:
         ...
 
@@ -39,10 +40,6 @@ class MsgReader(ABC):
     async def read_msg(self) -> bytes:
         ...
 
-    # @abstractmethod
-    # async def next_msg_len(self) -> int:
-    #     ...
-
 
 class MsgWriter(ABC):
     @abstractmethod
@@ -50,7 +47,7 @@ class MsgWriter(ABC):
         ...
 
 
-class MsgReadWriter(MsgReader, MsgWriter):
+class MsgReadWriteCloser(MsgReader, MsgWriter, Closer):
     pass
 
 
@@ -64,5 +61,5 @@ class Encrypter(ABC):
         ...
 
 
-class EncryptedMsgReadWriter(MsgReadWriter, Encrypter):
-    pass
+class EncryptedMsgReadWriter(MsgReadWriteCloser, Encrypter):
+    """Read/write message with encryption/decryption."""

libp2p/io/msgio.py

@@ -8,10 +8,9 @@ NOTE: currently missing the capability to indicate lengths by "varint" method.
 # TODO unify w/ https://github.com/libp2p/py-libp2p/blob/1aed52856f56a4b791696bbcbac31b5f9c2e88c9/libp2p/utils.py#L85-L99  # noqa: E501
 from typing import Optional
 
-from libp2p.io.abc import MsgReadWriter, Reader, ReadWriteCloser
+from libp2p.io.abc import MsgReadWriteCloser, Reader, ReadWriteCloser
 from libp2p.io.utils import read_exactly
 
-
 BYTE_ORDER = "big"
 
 
@@ -26,12 +25,12 @@ def encode_msg_with_length(msg_bytes: bytes, size_len_bytes: int) -> bytes:
     except OverflowError:
         raise ValueError(
             "msg_bytes is too large for `size_len_bytes` bytes length: "
-            f"msg_bytes={msg_bytes}, size_len_bytes={size_len_bytes}"
+            f"msg_bytes={msg_bytes!r}, size_len_bytes={size_len_bytes}"
         )
     return len_prefix + msg_bytes
 
 
-class BaseMsgReadWriter(MsgReadWriter):
+class BaseMsgReadWriter(MsgReadWriteCloser):
     next_length: Optional[int]
     read_write_closer: ReadWriteCloser
     size_len_bytes: int