1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
# 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
from gevent._compat import PY3
from gevent._compat import exc_clear
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):
"""
create_connection(address, timeout=None, source_address=None) -> socket
Connect to *address* and return the :class:`gevent.socket.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
# getaddrinfo is documented as returning a list, but our interface
# is pluggable, so be sure it does.
addrs = list(getaddrinfo(host, port, 0, SOCK_STREAM))
if not addrs:
raise error("getaddrinfo returns an empty list")
for res in addrs:
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)
except error:
if sock is not None:
sock.close()
sock = None
if res is addrs[-1]:
raise
# 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
exc_clear()
except BaseException:
# Things like GreenletExit, Timeout and KeyboardInterrupt.
# These get raised immediately, being sure to
# close the socket
if sock is not None:
sock.close()
sock = None
raise
else:
try:
return sock
finally:
sock = None
# 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
|
