calibre-web/vendor/tornado/platform/caresresolver.py
OzzieIsaacs bbf6d9b026 Translation of UI (german and english)
Bugfix for feeds
    - removed categories related and up
    - load new books now working
    - category random now working
login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
book shelfs can be deleted from UI
Anonymous user view is more resticted
Added browse of series in sidebar
Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working
2016-11-09 19:24:33 +01:00

80 lines
3.0 KiB
Python

from __future__ import absolute_import, division, print_function, with_statement
import pycares
import socket
from tornado import gen
from tornado.ioloop import IOLoop
from tornado.netutil import Resolver, is_valid_ip
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.
c-ares fails to resolve some names 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:: 4.1
The ``io_loop`` argument is deprecated.
"""
def initialize(self, io_loop=None):
self.io_loop = io_loop or IOLoop.current()
self.channel = pycares.Channel(sock_state_cb=self._sock_state_cb)
self.fds = {}
def _sock_state_cb(self, fd, readable, writable):
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, events):
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, port, family=0):
if is_valid_ip(host):
addresses = [host]
else:
# gethostbyname doesn't take callback as a kwarg
self.channel.gethostbyname(host, family, (yield gen.Callback(1)))
callback_args = yield gen.Wait(1)
assert isinstance(callback_args, gen.Arguments)
assert not callback_args.kwargs
result, error = callback_args.args
if error:
raise Exception('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 Exception('Requested socket family %d but got %d' %
(family, address_family))
addrinfo.append((address_family, (address, port)))
raise gen.Return(addrinfo)