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"""ledgercomm.comm module."""
from abc import ABCMeta, abstractmethod
from typing import Tuple
class Comm(metaclass=ABCMeta):
"""Abstract class for communication interface."""
@abstractmethod
def open(self) -> None:
"""Just open the interface."""
raise NotImplementedError
@abstractmethod
def send(self, data: bytes) -> int:
"""Allow to send raw bytes from the interface."""
raise NotImplementedError
@abstractmethod
def recv(self) -> Tuple[int, bytes]:
"""Allow to receive raw bytes from the interface."""
raise NotImplementedError
@abstractmethod
def exchange(self, data: bytes) -> Tuple[int, bytes]:
"""Allow to send and receive raw bytes from the interface."""
raise NotImplementedError
@abstractmethod
def close(self) -> None:
"""Just close the interface."""
raise NotImplementedError
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