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# Copyright (c) 2009-2014 Denis Bilenko and gevent contributors. See LICENSE for details.
"""Cooperative low-level networking interface.
This module provides socket operations and some related functions.
The API of the functions and classes matches the API of the corresponding
items in the standard :mod:`socket` module exactly, but the synchronous functions
in this module only block the current greenlet and let the others run.
For convenience, exceptions (like :class:`error <socket.error>` and :class:`timeout <socket.timeout>`)
as well as the constants from the :mod:`socket` module are imported into this module.
"""
# Our import magic sadly makes this warning useless
# pylint: disable=undefined-variable
import sys
from gevent._compat import PY3
from gevent._util import copy_globals
if PY3:
from gevent import _socket3 as _source # python 2: pylint:disable=no-name-in-module
else:
from gevent import _socket2 as _source
# define some things we're expecting to overwrite; each module
# needs to define these
__implements__ = __dns__ = __all__ = __extensions__ = __imports__ = ()
class error(Exception):
errno = None
def getfqdn(*args):
# pylint:disable=unused-argument
raise NotImplementedError()
copy_globals(_source, globals(),
dunder_names_to_keep=('__implements__', '__dns__', '__all__',
'__extensions__', '__imports__', '__socket__'),
cleanup_globs=False)
# The _socket2 and _socket3 don't import things defined in
# __extensions__, to help avoid confusing reference cycles in the
# documentation and to prevent importing from the wrong place, but we
# *do* need to expose them here. (NOTE: This may lead to some sphinx
# warnings like:
# WARNING: missing attribute mentioned in :members: or __all__:
# module gevent._socket2, attribute cancel_wait
# These can be ignored.)
from gevent import _socketcommon
copy_globals(_socketcommon, globals(),
only_names=_socketcommon.__extensions__)
try:
_GLOBAL_DEFAULT_TIMEOUT = __socket__._GLOBAL_DEFAULT_TIMEOUT
except AttributeError:
_GLOBAL_DEFAULT_TIMEOUT = object()
def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT, source_address=None):
"""Connect to *address* and return the socket object.
Convenience function. Connect to *address* (a 2-tuple ``(host,
port)``) and return the socket object. Passing the optional
*timeout* parameter will set the timeout on the socket instance
before attempting to connect. If no *timeout* is supplied, the
global default timeout setting returned by :func:`getdefaulttimeout`
is used. If *source_address* is set it must be a tuple of (host, port)
for the socket to bind as a source address before making the connection.
A host of '' or port 0 tells the OS to use the default.
"""
host, port = address
err = None
for res in getaddrinfo(host, port, 0 if has_ipv6 else AF_INET, SOCK_STREAM):
af, socktype, proto, _, sa = res
sock = None
try:
sock = socket(af, socktype, proto)
if timeout is not _GLOBAL_DEFAULT_TIMEOUT:
sock.settimeout(timeout)
if source_address:
sock.bind(source_address)
sock.connect(sa)
return sock
except error as ex:
# without exc_clear(), if connect() fails once, the socket is referenced by the frame in exc_info
# and the next bind() fails (see test__socket.TestCreateConnection)
# that does not happen with regular sockets though, because _socket.socket.connect() is a built-in.
# this is similar to "getnameinfo loses a reference" failure in test_socket.py
if not PY3:
sys.exc_clear() # pylint:disable=no-member,useless-suppression
if sock is not None:
sock.close()
err = ex
if err is not None:
raise err # pylint:disable=raising-bad-type
else:
raise error("getaddrinfo returns an empty list")
# This is promised to be in the __all__ of the _source, but, for circularity reasons,
# we implement it in this module. Mostly for documentation purposes, put it
# in the _source too.
_source.create_connection = create_connection
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