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70 lines
1.8 KiB
70 lines
1.8 KiB
3 years ago
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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# This is a nullcontext for both sync and async. 3.7 has a nullcontext,
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# but it is only for sync use.
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class NullContext:
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def __init__(self, enter_result=None):
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self.enter_result = enter_result
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def __enter__(self):
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return self.enter_result
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def __exit__(self, exc_type, exc_value, traceback):
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pass
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async def __aenter__(self):
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return self.enter_result
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async def __aexit__(self, exc_type, exc_value, traceback):
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pass
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# These are declared here so backends can import them without creating
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# circular dependencies with dns.asyncbackend.
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class Socket: # pragma: no cover
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async def close(self):
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pass
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async def getpeername(self):
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raise NotImplementedError
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async def getsockname(self):
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raise NotImplementedError
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async def __aenter__(self):
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return self
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async def __aexit__(self, exc_type, exc_value, traceback):
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await self.close()
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class DatagramSocket(Socket): # pragma: no cover
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async def sendto(self, what, destination, timeout):
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raise NotImplementedError
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async def recvfrom(self, size, timeout):
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raise NotImplementedError
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class StreamSocket(Socket): # pragma: no cover
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async def sendall(self, what, timeout):
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raise NotImplementedError
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async def recv(self, size, timeout):
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raise NotImplementedError
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class Backend: # pragma: no cover
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def name(self):
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return 'unknown'
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async def make_socket(self, af, socktype, proto=0,
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source=None, destination=None, timeout=None,
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ssl_context=None, server_hostname=None):
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raise NotImplementedError
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def datagram_connection_required(self):
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return False
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