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# 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 getpeername(self):
raise NotImplementedError
async def getsockname(self):
raise NotImplementedError
async def __aenter__(self):
return self
async def __aexit__(self, exc_type, exc_value, traceback):
await self.close()
class DatagramSocket(Socket): # pragma: no cover
def __init__(self, family: int):
self.family = family
async def sendto(self, what, destination, timeout):
raise NotImplementedError
async def recvfrom(self, size, timeout):
raise NotImplementedError
class StreamSocket(Socket): # pragma: no cover
async def sendall(self, what, timeout):
raise NotImplementedError
async def recv(self, size, timeout):
raise NotImplementedError
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
def datagram_connection_required(self):
return False
async def sleep(self, interval):
raise NotImplementedError