from abc import ABC, abstractmethod
from typing import List

from multiaddr import Multiaddr


class IListener(ABC):
    @abstractmethod
    async def listen(self, maddr: Multiaddr) -> bool:
        """
        put listener in listening mode and wait for incoming connections.

        :param maddr: multiaddr of peer
        :return: return True if successful
        """

    @abstractmethod
    def get_addrs(self) -> List[Multiaddr]:
        """
        retrieve list of addresses the listener is listening on.

        :return: return list of addrs
        """

    @abstractmethod
    async def close(self) -> None:
        """close the listener such that no more connections can be open on this
        transport instance."""