mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-23 03:03:38 +00:00
94 lines
3.4 KiB
Python
94 lines
3.4 KiB
Python
import pycares # type: ignore
|
|
import socket
|
|
|
|
from tornado.concurrent import Future
|
|
from tornado import gen
|
|
from tornado.ioloop import IOLoop
|
|
from tornado.netutil import Resolver, is_valid_ip
|
|
|
|
import typing
|
|
|
|
if typing.TYPE_CHECKING:
|
|
from typing import Generator, Any, List, Tuple, Dict # noqa: F401
|
|
|
|
|
|
class CaresResolver(Resolver):
|
|
"""Name resolver based on the c-ares library.
|
|
|
|
This is a non-blocking and non-threaded resolver. It may not produce the
|
|
same results as the system resolver, but can be used for non-blocking
|
|
resolution when threads cannot be used.
|
|
|
|
``pycares`` will not return a mix of ``AF_INET`` and ``AF_INET6`` when
|
|
``family`` is ``AF_UNSPEC``, so it is only recommended for use in
|
|
``AF_INET`` (i.e. IPv4). This is the default for
|
|
``tornado.simple_httpclient``, but other libraries may default to
|
|
``AF_UNSPEC``.
|
|
|
|
.. versionchanged:: 5.0
|
|
The ``io_loop`` argument (deprecated since version 4.1) has been removed.
|
|
|
|
.. deprecated:: 6.2
|
|
This class is deprecated and will be removed in Tornado 7.0. Use the default
|
|
thread-based resolver instead.
|
|
"""
|
|
|
|
def initialize(self) -> None:
|
|
self.io_loop = IOLoop.current()
|
|
self.channel = pycares.Channel(sock_state_cb=self._sock_state_cb)
|
|
self.fds = {} # type: Dict[int, int]
|
|
|
|
def _sock_state_cb(self, fd: int, readable: bool, writable: bool) -> None:
|
|
state = (IOLoop.READ if readable else 0) | (IOLoop.WRITE if writable else 0)
|
|
if not state:
|
|
self.io_loop.remove_handler(fd)
|
|
del self.fds[fd]
|
|
elif fd in self.fds:
|
|
self.io_loop.update_handler(fd, state)
|
|
self.fds[fd] = state
|
|
else:
|
|
self.io_loop.add_handler(fd, self._handle_events, state)
|
|
self.fds[fd] = state
|
|
|
|
def _handle_events(self, fd: int, events: int) -> None:
|
|
read_fd = pycares.ARES_SOCKET_BAD
|
|
write_fd = pycares.ARES_SOCKET_BAD
|
|
if events & IOLoop.READ:
|
|
read_fd = fd
|
|
if events & IOLoop.WRITE:
|
|
write_fd = fd
|
|
self.channel.process_fd(read_fd, write_fd)
|
|
|
|
@gen.coroutine
|
|
def resolve(
|
|
self, host: str, port: int, family: int = 0
|
|
) -> "Generator[Any, Any, List[Tuple[int, Any]]]":
|
|
if is_valid_ip(host):
|
|
addresses = [host]
|
|
else:
|
|
# gethostbyname doesn't take callback as a kwarg
|
|
fut = Future() # type: Future[Tuple[Any, Any]]
|
|
self.channel.gethostbyname(
|
|
host, family, lambda result, error: fut.set_result((result, error))
|
|
)
|
|
result, error = yield fut
|
|
if error:
|
|
raise IOError(
|
|
"C-Ares returned error %s: %s while resolving %s"
|
|
% (error, pycares.errno.strerror(error), host)
|
|
)
|
|
addresses = result.addresses
|
|
addrinfo = []
|
|
for address in addresses:
|
|
if "." in address:
|
|
address_family = socket.AF_INET
|
|
elif ":" in address:
|
|
address_family = socket.AF_INET6
|
|
else:
|
|
address_family = socket.AF_UNSPEC
|
|
if family != socket.AF_UNSPEC and family != address_family:
|
|
raise IOError(
|
|
"Requested socket family %d but got %d" % (family, address_family)
|
|
)
|
|
addrinfo.append((typing.cast(int, address_family), (address, port)))
|
|
return addrinfo
|