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109 lines
3.3 KiB
109 lines
3.3 KiB
3 years ago
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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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"""curio async I/O library query support"""
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import socket
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import curio
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import curio.socket # type: ignore
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import dns._asyncbackend
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import dns.exception
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import dns.inet
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def _maybe_timeout(timeout):
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if timeout:
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return curio.ignore_after(timeout)
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else:
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return dns._asyncbackend.NullContext()
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# for brevity
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_lltuple = dns.inet.low_level_address_tuple
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# pylint: disable=redefined-outer-name
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class DatagramSocket(dns._asyncbackend.DatagramSocket):
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def __init__(self, socket):
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self.socket = socket
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self.family = socket.family
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async def sendto(self, what, destination, timeout):
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async with _maybe_timeout(timeout):
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return await self.socket.sendto(what, destination)
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raise dns.exception.Timeout(timeout=timeout) # pragma: no cover
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async def recvfrom(self, size, timeout):
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async with _maybe_timeout(timeout):
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return await self.socket.recvfrom(size)
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raise dns.exception.Timeout(timeout=timeout)
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async def close(self):
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await self.socket.close()
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async def getpeername(self):
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return self.socket.getpeername()
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async def getsockname(self):
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return self.socket.getsockname()
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class StreamSocket(dns._asyncbackend.StreamSocket):
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def __init__(self, socket):
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self.socket = socket
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self.family = socket.family
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async def sendall(self, what, timeout):
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async with _maybe_timeout(timeout):
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return await self.socket.sendall(what)
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raise dns.exception.Timeout(timeout=timeout)
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async def recv(self, size, timeout):
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async with _maybe_timeout(timeout):
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return await self.socket.recv(size)
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raise dns.exception.Timeout(timeout=timeout)
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async def close(self):
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await self.socket.close()
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async def getpeername(self):
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return self.socket.getpeername()
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async def getsockname(self):
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return self.socket.getsockname()
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class Backend(dns._asyncbackend.Backend):
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def name(self):
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return 'curio'
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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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if socktype == socket.SOCK_DGRAM:
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s = curio.socket.socket(af, socktype, proto)
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try:
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if source:
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s.bind(_lltuple(source, af))
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except Exception: # pragma: no cover
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await s.close()
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raise
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return DatagramSocket(s)
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elif socktype == socket.SOCK_STREAM:
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if source:
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source_addr = _lltuple(source, af)
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else:
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source_addr = None
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async with _maybe_timeout(timeout):
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s = await curio.open_connection(destination[0], destination[1],
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ssl=ssl_context,
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source_addr=source_addr,
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server_hostname=server_hostname)
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return StreamSocket(s)
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raise NotImplementedError('unsupported socket ' +
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f'type {socktype}') # pragma: no cover
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async def sleep(self, interval):
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await curio.sleep(interval)
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