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