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Dir : //proc/self/root/opt/saltstack/salt/extras-3.10/dns/_asyncbackend.py

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# This is a nullcontext for both sync and async.  3.7 has a nullcontext,
# but it is only for sync use.

class NullContext:
    def __init__(self, enter_result=None):
        self.enter_result = enter_result

    def __enter__(self):
        return self.enter_result

    def __exit__(self, exc_type, exc_value, traceback):
        pass

    async def __aenter__(self):
        return self.enter_result

    async def __aexit__(self, exc_type, exc_value, traceback):
        pass


# These are declared here so backends can import them without creating
# circular dependencies with dns.asyncbackend.

class Socket:  # pragma: no cover
    async def close(self):
        pass

    async def __aenter__(self):
        return self

    async def __aexit__(self, exc_type, exc_value, traceback):
        await self.close()


class DatagramSocket(Socket):  # pragma: no cover
    async def sendto(self, what, destination, timeout):
        pass

    async def recvfrom(self, size, timeout):
        pass


class StreamSocket(Socket):  # pragma: no cover
    async def sendall(self, what, destination, timeout):
        pass

    async def recv(self, size, timeout):
        pass


class Backend:    # pragma: no cover
    def name(self):
        return 'unknown'

    async def make_socket(self, af, socktype, proto=0,
                          source=None, destination=None, timeout=None,
                          ssl_context=None, server_hostname=None):
        raise NotImplementedError