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465 lines
16 KiB
465 lines
16 KiB
# Copyright (c) 2011-2012 Denis Bilenko. See LICENSE for details.
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# Automatic pickling of cdef classes was added in 0.26. Unfortunately it
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# seems to be buggy (at least for the `result` class) and produces code that
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# can't compile ("local variable 'result' referenced before assignment").
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# See https://github.com/cython/cython/issues/1786
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# cython: auto_pickle=False
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cimport libcares as cares
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import sys
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from cpython.ref cimport Py_INCREF
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from cpython.ref cimport Py_DECREF
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from cpython.mem cimport PyMem_Malloc
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from cpython.mem cimport PyMem_Free
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from _socket import gaierror
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__all__ = ['channel']
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cdef object string_types
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cdef object text_type
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if sys.version_info[0] >= 3:
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string_types = str,
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text_type = str
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else:
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string_types = __builtins__.basestring,
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text_type = __builtins__.unicode
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TIMEOUT = 1
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DEF EV_READ = 1
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DEF EV_WRITE = 2
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cdef extern from "dnshelper.c":
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int AF_INET
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int AF_INET6
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struct hostent:
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char* h_name
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int h_addrtype
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struct sockaddr_t "sockaddr":
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pass
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struct ares_channeldata:
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pass
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object parse_h_name(hostent*)
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object parse_h_aliases(hostent*)
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object parse_h_addr_list(hostent*)
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void* create_object_from_hostent(void*)
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# this imports _socket lazily
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object PyUnicode_FromString(char*)
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int PyTuple_Check(object)
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int PyArg_ParseTuple(object, char*, ...) except 0
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struct sockaddr_in6:
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pass
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int gevent_make_sockaddr(char* hostp, int port, int flowinfo, int scope_id, sockaddr_in6* sa6)
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void memset(void*, int, int)
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ARES_SUCCESS = cares.ARES_SUCCESS
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ARES_ENODATA = cares.ARES_ENODATA
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ARES_EFORMERR = cares.ARES_EFORMERR
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ARES_ESERVFAIL = cares.ARES_ESERVFAIL
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ARES_ENOTFOUND = cares.ARES_ENOTFOUND
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ARES_ENOTIMP = cares.ARES_ENOTIMP
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ARES_EREFUSED = cares.ARES_EREFUSED
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ARES_EBADQUERY = cares.ARES_EBADQUERY
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ARES_EBADNAME = cares.ARES_EBADNAME
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ARES_EBADFAMILY = cares.ARES_EBADFAMILY
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ARES_EBADRESP = cares.ARES_EBADRESP
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ARES_ECONNREFUSED = cares.ARES_ECONNREFUSED
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ARES_ETIMEOUT = cares.ARES_ETIMEOUT
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ARES_EOF = cares.ARES_EOF
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ARES_EFILE = cares.ARES_EFILE
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ARES_ENOMEM = cares.ARES_ENOMEM
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ARES_EDESTRUCTION = cares.ARES_EDESTRUCTION
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ARES_EBADSTR = cares.ARES_EBADSTR
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ARES_EBADFLAGS = cares.ARES_EBADFLAGS
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ARES_ENONAME = cares.ARES_ENONAME
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ARES_EBADHINTS = cares.ARES_EBADHINTS
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ARES_ENOTINITIALIZED = cares.ARES_ENOTINITIALIZED
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ARES_ELOADIPHLPAPI = cares.ARES_ELOADIPHLPAPI
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ARES_EADDRGETNETWORKPARAMS = cares.ARES_EADDRGETNETWORKPARAMS
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ARES_ECANCELLED = cares.ARES_ECANCELLED
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ARES_FLAG_USEVC = cares.ARES_FLAG_USEVC
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ARES_FLAG_PRIMARY = cares.ARES_FLAG_PRIMARY
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ARES_FLAG_IGNTC = cares.ARES_FLAG_IGNTC
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ARES_FLAG_NORECURSE = cares.ARES_FLAG_NORECURSE
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ARES_FLAG_STAYOPEN = cares.ARES_FLAG_STAYOPEN
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ARES_FLAG_NOSEARCH = cares.ARES_FLAG_NOSEARCH
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ARES_FLAG_NOALIASES = cares.ARES_FLAG_NOALIASES
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ARES_FLAG_NOCHECKRESP = cares.ARES_FLAG_NOCHECKRESP
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_ares_errors = dict([
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(cares.ARES_SUCCESS, 'ARES_SUCCESS'),
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(cares.ARES_ENODATA, 'ARES_ENODATA'),
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(cares.ARES_EFORMERR, 'ARES_EFORMERR'),
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(cares.ARES_ESERVFAIL, 'ARES_ESERVFAIL'),
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(cares.ARES_ENOTFOUND, 'ARES_ENOTFOUND'),
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(cares.ARES_ENOTIMP, 'ARES_ENOTIMP'),
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(cares.ARES_EREFUSED, 'ARES_EREFUSED'),
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(cares.ARES_EBADQUERY, 'ARES_EBADQUERY'),
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(cares.ARES_EBADNAME, 'ARES_EBADNAME'),
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(cares.ARES_EBADFAMILY, 'ARES_EBADFAMILY'),
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(cares.ARES_EBADRESP, 'ARES_EBADRESP'),
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(cares.ARES_ECONNREFUSED, 'ARES_ECONNREFUSED'),
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(cares.ARES_ETIMEOUT, 'ARES_ETIMEOUT'),
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(cares.ARES_EOF, 'ARES_EOF'),
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(cares.ARES_EFILE, 'ARES_EFILE'),
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(cares.ARES_ENOMEM, 'ARES_ENOMEM'),
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(cares.ARES_EDESTRUCTION, 'ARES_EDESTRUCTION'),
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(cares.ARES_EBADSTR, 'ARES_EBADSTR'),
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(cares.ARES_EBADFLAGS, 'ARES_EBADFLAGS'),
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(cares.ARES_ENONAME, 'ARES_ENONAME'),
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(cares.ARES_EBADHINTS, 'ARES_EBADHINTS'),
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(cares.ARES_ENOTINITIALIZED, 'ARES_ENOTINITIALIZED'),
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(cares.ARES_ELOADIPHLPAPI, 'ARES_ELOADIPHLPAPI'),
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(cares.ARES_EADDRGETNETWORKPARAMS, 'ARES_EADDRGETNETWORKPARAMS'),
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(cares.ARES_ECANCELLED, 'ARES_ECANCELLED')])
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# maps c-ares flag to _socket module flag
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_cares_flag_map = None
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cdef _prepare_cares_flag_map():
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global _cares_flag_map
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import _socket
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_cares_flag_map = [
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(getattr(_socket, 'NI_NUMERICHOST', 1), cares.ARES_NI_NUMERICHOST),
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(getattr(_socket, 'NI_NUMERICSERV', 2), cares.ARES_NI_NUMERICSERV),
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(getattr(_socket, 'NI_NOFQDN', 4), cares.ARES_NI_NOFQDN),
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(getattr(_socket, 'NI_NAMEREQD', 8), cares.ARES_NI_NAMEREQD),
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(getattr(_socket, 'NI_DGRAM', 16), cares.ARES_NI_DGRAM)]
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cpdef _convert_cares_flags(int flags, int default=cares.ARES_NI_LOOKUPHOST|cares.ARES_NI_LOOKUPSERVICE):
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if _cares_flag_map is None:
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_prepare_cares_flag_map()
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for socket_flag, cares_flag in _cares_flag_map:
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if socket_flag & flags:
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default |= cares_flag
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flags &= ~socket_flag
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if not flags:
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return default
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raise gaierror(-1, "Bad value for ai_flags: 0x%x" % flags)
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cpdef strerror(code):
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return '%s: %s' % (_ares_errors.get(code) or code, cares.ares_strerror(code))
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class InvalidIP(ValueError):
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pass
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cdef void gevent_sock_state_callback(void *data, int s, int read, int write):
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if not data:
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return
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cdef channel ch = <channel>data
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ch._sock_state_callback(s, read, write)
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cdef class result:
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cdef public object value
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cdef public object exception
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def __init__(self, object value=None, object exception=None):
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self.value = value
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self.exception = exception
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def __repr__(self):
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if self.exception is None:
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return '%s(%r)' % (self.__class__.__name__, self.value)
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elif self.value is None:
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return '%s(exception=%r)' % (self.__class__.__name__, self.exception)
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else:
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return '%s(value=%r, exception=%r)' % (self.__class__.__name__, self.value, self.exception)
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# add repr_recursive precaution
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def successful(self):
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return self.exception is None
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def get(self):
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if self.exception is not None:
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raise self.exception
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return self.value
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class ares_host_result(tuple):
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def __new__(cls, family, iterable):
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cdef object self = tuple.__new__(cls, iterable)
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self.family = family
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return self
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def __getnewargs__(self):
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return (self.family, tuple(self))
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cdef void gevent_ares_host_callback(void *arg, int status, int timeouts, hostent* host):
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cdef channel channel
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cdef object callback
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channel, callback = <tuple>arg
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Py_DECREF(<tuple>arg)
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cdef object host_result
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try:
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if status or not host:
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callback(result(None, gaierror(status, strerror(status))))
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else:
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try:
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host_result = ares_host_result(host.h_addrtype, (parse_h_name(host), parse_h_aliases(host), parse_h_addr_list(host)))
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except:
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callback(result(None, sys.exc_info()[1]))
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else:
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callback(result(host_result))
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except:
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channel.loop.handle_error(callback, *sys.exc_info())
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cdef void gevent_ares_nameinfo_callback(void *arg, int status, int timeouts, char *c_node, char *c_service):
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cdef channel channel
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cdef object callback
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channel, callback = <tuple>arg
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Py_DECREF(<tuple>arg)
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cdef object node
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cdef object service
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try:
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if status:
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callback(result(None, gaierror(status, strerror(status))))
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else:
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if c_node:
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node = PyUnicode_FromString(c_node)
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else:
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node = None
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if c_service:
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service = PyUnicode_FromString(c_service)
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else:
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service = None
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callback(result((node, service)))
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except:
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channel.loop.handle_error(callback, *sys.exc_info())
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cdef class channel:
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cdef public object loop
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cdef ares_channeldata* channel
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cdef public dict _watchers
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cdef public object _timer
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def __init__(self, object loop, flags=None, timeout=None, tries=None, ndots=None,
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udp_port=None, tcp_port=None, servers=None):
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cdef ares_channeldata* channel = NULL
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cdef cares.ares_options options
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memset(&options, 0, sizeof(cares.ares_options))
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cdef int optmask = cares.ARES_OPT_SOCK_STATE_CB
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options.sock_state_cb = <void*>gevent_sock_state_callback
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options.sock_state_cb_data = <void*>self
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if flags is not None:
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options.flags = int(flags)
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optmask |= cares.ARES_OPT_FLAGS
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if timeout is not None:
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options.timeout = int(float(timeout) * 1000)
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optmask |= cares.ARES_OPT_TIMEOUTMS
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if tries is not None:
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options.tries = int(tries)
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optmask |= cares.ARES_OPT_TRIES
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if ndots is not None:
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options.ndots = int(ndots)
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optmask |= cares.ARES_OPT_NDOTS
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if udp_port is not None:
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options.udp_port = int(udp_port)
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optmask |= cares.ARES_OPT_UDP_PORT
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if tcp_port is not None:
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options.tcp_port = int(tcp_port)
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optmask |= cares.ARES_OPT_TCP_PORT
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cdef int result = cares.ares_library_init(cares.ARES_LIB_INIT_ALL) # ARES_LIB_INIT_WIN32 -DUSE_WINSOCK?
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if result:
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raise gaierror(result, strerror(result))
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result = cares.ares_init_options(&channel, &options, optmask)
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if result:
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raise gaierror(result, strerror(result))
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self._timer = loop.timer(TIMEOUT, TIMEOUT)
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self._watchers = {}
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self.channel = channel
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try:
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if servers is not None:
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self.set_servers(servers)
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self.loop = loop
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except:
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self.destroy()
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raise
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def __repr__(self):
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args = (self.__class__.__name__, id(self), self._timer, len(self._watchers))
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return '<%s at 0x%x _timer=%r _watchers[%s]>' % args
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def destroy(self):
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if self.channel:
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# XXX ares_library_cleanup?
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cares.ares_destroy(self.channel)
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self.channel = NULL
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self._watchers.clear()
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self._timer.stop()
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self.loop = None
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def __dealloc__(self):
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if self.channel:
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# XXX ares_library_cleanup?
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cares.ares_destroy(self.channel)
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self.channel = NULL
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cpdef set_servers(self, servers=None):
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if not self.channel:
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raise gaierror(cares.ARES_EDESTRUCTION, 'this ares channel has been destroyed')
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if not servers:
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servers = []
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if isinstance(servers, string_types):
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servers = servers.split(',')
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cdef int length = len(servers)
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cdef int result, index
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cdef char* string
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cdef cares.ares_addr_node* c_servers
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if length <= 0:
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result = cares.ares_set_servers(self.channel, NULL)
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else:
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c_servers = <cares.ares_addr_node*>PyMem_Malloc(sizeof(cares.ares_addr_node) * length)
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if not c_servers:
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raise MemoryError
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try:
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index = 0
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for server in servers:
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if isinstance(server, unicode):
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server = server.encode('ascii')
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string = <char*?>server
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if cares.ares_inet_pton(AF_INET, string, &c_servers[index].addr) > 0:
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c_servers[index].family = AF_INET
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elif cares.ares_inet_pton(AF_INET6, string, &c_servers[index].addr) > 0:
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c_servers[index].family = AF_INET6
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else:
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raise InvalidIP(repr(string))
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c_servers[index].next = &c_servers[index] + 1
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index += 1
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if index >= length:
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break
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c_servers[length - 1].next = NULL
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index = cares.ares_set_servers(self.channel, c_servers)
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if index:
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raise ValueError(strerror(index))
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finally:
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PyMem_Free(c_servers)
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# this crashes c-ares
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#def cancel(self):
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# cares.ares_cancel(self.channel)
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cdef _sock_state_callback(self, int socket, int read, int write):
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if not self.channel:
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return
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cdef object watcher = self._watchers.get(socket)
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cdef int events = 0
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if read:
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events |= EV_READ
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if write:
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events |= EV_WRITE
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if watcher is None:
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if not events:
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return
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watcher = self.loop.io(socket, events)
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self._watchers[socket] = watcher
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elif events:
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if watcher.events == events:
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return
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watcher.stop()
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watcher.events = events
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else:
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watcher.stop()
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watcher.close()
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self._watchers.pop(socket, None)
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if not self._watchers:
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self._timer.stop()
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return
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watcher.start(self._process_fd, watcher, pass_events=True)
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self._timer.again(self._on_timer)
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def _on_timer(self):
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cares.ares_process_fd(self.channel, cares.ARES_SOCKET_BAD, cares.ARES_SOCKET_BAD)
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def _process_fd(self, int events, object watcher):
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if not self.channel:
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return
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cdef int read_fd = watcher.fd
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cdef int write_fd = read_fd
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if not (events & EV_READ):
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read_fd = cares.ARES_SOCKET_BAD
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if not (events & EV_WRITE):
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write_fd = cares.ARES_SOCKET_BAD
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cares.ares_process_fd(self.channel, read_fd, write_fd)
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def gethostbyname(self, object callback, char* name, int family=AF_INET):
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if not self.channel:
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raise gaierror(cares.ARES_EDESTRUCTION, 'this ares channel has been destroyed')
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# note that for file lookups still AF_INET can be returned for AF_INET6 request
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cdef object arg = (self, callback)
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Py_INCREF(arg)
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cares.ares_gethostbyname(self.channel, name, family, <void*>gevent_ares_host_callback, <void*>arg)
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def gethostbyaddr(self, object callback, char* addr):
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if not self.channel:
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raise gaierror(cares.ARES_EDESTRUCTION, 'this ares channel has been destroyed')
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# will guess the family
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cdef char addr_packed[16]
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cdef int family
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cdef int length
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if cares.ares_inet_pton(AF_INET, addr, addr_packed) > 0:
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family = AF_INET
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length = 4
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elif cares.ares_inet_pton(AF_INET6, addr, addr_packed) > 0:
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family = AF_INET6
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length = 16
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else:
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raise InvalidIP(repr(addr))
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cdef object arg = (self, callback)
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Py_INCREF(arg)
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cares.ares_gethostbyaddr(self.channel, addr_packed, length, family, <void*>gevent_ares_host_callback, <void*>arg)
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cpdef _getnameinfo(self, object callback, tuple sockaddr, int flags):
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if not self.channel:
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raise gaierror(cares.ARES_EDESTRUCTION, 'this ares channel has been destroyed')
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cdef char* hostp = NULL
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cdef int port = 0
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cdef int flowinfo = 0
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cdef int scope_id = 0
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cdef sockaddr_in6 sa6
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if not PyTuple_Check(sockaddr):
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raise TypeError('expected a tuple, got %r' % (sockaddr, ))
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PyArg_ParseTuple(sockaddr, "si|ii", &hostp, &port, &flowinfo, &scope_id)
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if port < 0 or port > 65535:
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raise gaierror(-8, 'Invalid value for port: %r' % port)
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cdef int length = gevent_make_sockaddr(hostp, port, flowinfo, scope_id, &sa6)
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if length <= 0:
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raise InvalidIP(repr(hostp))
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cdef object arg = (self, callback)
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Py_INCREF(arg)
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cdef sockaddr_t* x = <sockaddr_t*>&sa6
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cares.ares_getnameinfo(self.channel, x, length, flags, <void*>gevent_ares_nameinfo_callback, <void*>arg)
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def getnameinfo(self, object callback, tuple sockaddr, int flags):
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try:
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flags = _convert_cares_flags(flags)
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except gaierror:
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# The stdlib just ignores bad flags
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flags = 0
|
|
return self._getnameinfo(callback, sockaddr, flags)
|