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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
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
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