Spaces:
Building
Building
File size: 8,971 Bytes
5a2de49 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 |
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
"""asyncio library query support"""
import asyncio
import socket
import sys
import dns._asyncbackend
import dns._features
import dns.exception
import dns.inet
_is_win32 = sys.platform == "win32"
def _get_running_loop():
try:
return asyncio.get_running_loop()
except AttributeError: # pragma: no cover
return asyncio.get_event_loop()
class _DatagramProtocol:
def __init__(self):
self.transport = None
self.recvfrom = None
def connection_made(self, transport):
self.transport = transport
def datagram_received(self, data, addr):
if self.recvfrom and not self.recvfrom.done():
self.recvfrom.set_result((data, addr))
def error_received(self, exc): # pragma: no cover
if self.recvfrom and not self.recvfrom.done():
self.recvfrom.set_exception(exc)
def connection_lost(self, exc):
if self.recvfrom and not self.recvfrom.done():
if exc is None:
# EOF we triggered. Is there a better way to do this?
try:
raise EOFError
except EOFError as e:
self.recvfrom.set_exception(e)
else:
self.recvfrom.set_exception(exc)
def close(self):
self.transport.close()
async def _maybe_wait_for(awaitable, timeout):
if timeout is not None:
try:
return await asyncio.wait_for(awaitable, timeout)
except asyncio.TimeoutError:
raise dns.exception.Timeout(timeout=timeout)
else:
return await awaitable
class DatagramSocket(dns._asyncbackend.DatagramSocket):
def __init__(self, family, transport, protocol):
super().__init__(family)
self.transport = transport
self.protocol = protocol
async def sendto(self, what, destination, timeout): # pragma: no cover
# no timeout for asyncio sendto
self.transport.sendto(what, destination)
return len(what)
async def recvfrom(self, size, timeout):
# ignore size as there's no way I know to tell protocol about it
done = _get_running_loop().create_future()
try:
assert self.protocol.recvfrom is None
self.protocol.recvfrom = done
await _maybe_wait_for(done, timeout)
return done.result()
finally:
self.protocol.recvfrom = None
async def close(self):
self.protocol.close()
async def getpeername(self):
return self.transport.get_extra_info("peername")
async def getsockname(self):
return self.transport.get_extra_info("sockname")
async def getpeercert(self, timeout):
raise NotImplementedError
class StreamSocket(dns._asyncbackend.StreamSocket):
def __init__(self, af, reader, writer):
self.family = af
self.reader = reader
self.writer = writer
async def sendall(self, what, timeout):
self.writer.write(what)
return await _maybe_wait_for(self.writer.drain(), timeout)
async def recv(self, size, timeout):
return await _maybe_wait_for(self.reader.read(size), timeout)
async def close(self):
self.writer.close()
async def getpeername(self):
return self.writer.get_extra_info("peername")
async def getsockname(self):
return self.writer.get_extra_info("sockname")
async def getpeercert(self, timeout):
return self.writer.get_extra_info("peercert")
if dns._features.have("doh"):
import anyio
import httpcore
import httpcore._backends.anyio
import httpx
_CoreAsyncNetworkBackend = httpcore.AsyncNetworkBackend
_CoreAnyIOStream = httpcore._backends.anyio.AnyIOStream
from dns.query import _compute_times, _expiration_for_this_attempt, _remaining
class _NetworkBackend(_CoreAsyncNetworkBackend):
def __init__(self, resolver, local_port, bootstrap_address, family):
super().__init__()
self._local_port = local_port
self._resolver = resolver
self._bootstrap_address = bootstrap_address
self._family = family
if local_port != 0:
raise NotImplementedError(
"the asyncio transport for HTTPX cannot set the local port"
)
async def connect_tcp(
self, host, port, timeout, local_address, socket_options=None
): # pylint: disable=signature-differs
addresses = []
_, expiration = _compute_times(timeout)
if dns.inet.is_address(host):
addresses.append(host)
elif self._bootstrap_address is not None:
addresses.append(self._bootstrap_address)
else:
timeout = _remaining(expiration)
family = self._family
if local_address:
family = dns.inet.af_for_address(local_address)
answers = await self._resolver.resolve_name(
host, family=family, lifetime=timeout
)
addresses = answers.addresses()
for address in addresses:
try:
attempt_expiration = _expiration_for_this_attempt(2.0, expiration)
timeout = _remaining(attempt_expiration)
with anyio.fail_after(timeout):
stream = await anyio.connect_tcp(
remote_host=address,
remote_port=port,
local_host=local_address,
)
return _CoreAnyIOStream(stream)
except Exception:
pass
raise httpcore.ConnectError
async def connect_unix_socket(
self, path, timeout, socket_options=None
): # pylint: disable=signature-differs
raise NotImplementedError
async def sleep(self, seconds): # pylint: disable=signature-differs
await anyio.sleep(seconds)
class _HTTPTransport(httpx.AsyncHTTPTransport):
def __init__(
self,
*args,
local_port=0,
bootstrap_address=None,
resolver=None,
family=socket.AF_UNSPEC,
**kwargs,
):
if resolver is None:
# pylint: disable=import-outside-toplevel,redefined-outer-name
import dns.asyncresolver
resolver = dns.asyncresolver.Resolver()
super().__init__(*args, **kwargs)
self._pool._network_backend = _NetworkBackend(
resolver, local_port, bootstrap_address, family
)
else:
_HTTPTransport = dns._asyncbackend.NullTransport # type: ignore
class Backend(dns._asyncbackend.Backend):
def name(self):
return "asyncio"
async def make_socket(
self,
af,
socktype,
proto=0,
source=None,
destination=None,
timeout=None,
ssl_context=None,
server_hostname=None,
):
loop = _get_running_loop()
if socktype == socket.SOCK_DGRAM:
if _is_win32 and source is None:
# Win32 wants explicit binding before recvfrom(). This is the
# proper fix for [#637].
source = (dns.inet.any_for_af(af), 0)
transport, protocol = await loop.create_datagram_endpoint(
_DatagramProtocol,
source,
family=af,
proto=proto,
remote_addr=destination,
)
return DatagramSocket(af, transport, protocol)
elif socktype == socket.SOCK_STREAM:
if destination is None:
# This shouldn't happen, but we check to make code analysis software
# happier.
raise ValueError("destination required for stream sockets")
(r, w) = await _maybe_wait_for(
asyncio.open_connection(
destination[0],
destination[1],
ssl=ssl_context,
family=af,
proto=proto,
local_addr=source,
server_hostname=server_hostname,
),
timeout,
)
return StreamSocket(af, r, w)
raise NotImplementedError(
"unsupported socket " + f"type {socktype}"
) # pragma: no cover
async def sleep(self, interval):
await asyncio.sleep(interval)
def datagram_connection_required(self):
return False
def get_transport_class(self):
return _HTTPTransport
async def wait_for(self, awaitable, timeout):
return await _maybe_wait_for(awaitable, timeout)
|