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