133 lines
3.8 KiB
Python
133 lines
3.8 KiB
Python
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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"""trio async I/O library query support"""
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import socket
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import trio
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import trio.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 trio.move_on_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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super().__init__(socket.family)
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self.socket = socket
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async def sendto(self, what, destination, timeout):
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with _maybe_timeout(timeout):
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return await self.socket.sendto(what, destination)
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raise dns.exception.Timeout(
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timeout=timeout
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) # pragma: no cover lgtm[py/unreachable-statement]
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async def recvfrom(self, size, timeout):
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with _maybe_timeout(timeout):
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return await self.socket.recvfrom(size)
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raise dns.exception.Timeout(timeout=timeout) # lgtm[py/unreachable-statement]
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async def close(self):
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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, family, stream, tls=False):
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self.family = family
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self.stream = stream
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self.tls = tls
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async def sendall(self, what, timeout):
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with _maybe_timeout(timeout):
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return await self.stream.send_all(what)
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raise dns.exception.Timeout(timeout=timeout) # lgtm[py/unreachable-statement]
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async def recv(self, size, timeout):
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with _maybe_timeout(timeout):
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return await self.stream.receive_some(size)
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raise dns.exception.Timeout(timeout=timeout) # lgtm[py/unreachable-statement]
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async def close(self):
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await self.stream.aclose()
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async def getpeername(self):
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if self.tls:
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return self.stream.transport_stream.socket.getpeername()
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else:
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return self.stream.socket.getpeername()
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async def getsockname(self):
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if self.tls:
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return self.stream.transport_stream.socket.getsockname()
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else:
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return self.stream.socket.getsockname()
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class Backend(dns._asyncbackend.Backend):
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def name(self):
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return "trio"
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async def make_socket(
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self,
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af,
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socktype,
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proto=0,
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source=None,
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destination=None,
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timeout=None,
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ssl_context=None,
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server_hostname=None,
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):
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s = trio.socket.socket(af, socktype, proto)
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stream = None
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try:
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if source:
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await s.bind(_lltuple(source, af))
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if socktype == socket.SOCK_STREAM:
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with _maybe_timeout(timeout):
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await s.connect(_lltuple(destination, af))
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except Exception: # pragma: no cover
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s.close()
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raise
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if socktype == socket.SOCK_DGRAM:
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return DatagramSocket(s)
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elif socktype == socket.SOCK_STREAM:
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stream = trio.SocketStream(s)
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tls = False
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if ssl_context:
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tls = True
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try:
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stream = trio.SSLStream(
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stream, ssl_context, server_hostname=server_hostname
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)
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except Exception: # pragma: no cover
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await stream.aclose()
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raise
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return StreamSocket(af, stream, tls)
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raise NotImplementedError(
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"unsupported socket " + f"type {socktype}"
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) # pragma: no cover
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async def sleep(self, interval):
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await trio.sleep(interval)
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