# Copyright (c) 2009-2014 Denis Bilenko and gevent contributors. See LICENSE for details.
"""
Python 2 socket module.
"""
from __future__ import absolute_import
from __future__ import print_function
# Our import magic sadly makes this warning useless
# pylint: disable=undefined-variable
import sys
from gevent import _socketcommon
from gevent._util import copy_globals
from gevent._compat import PYPY
copy_globals(_socketcommon, globals(),
names_to_ignore=_socketcommon.__py3_imports__ + _socketcommon.__extensions__,
dunder_names_to_keep=())
__socket__ = _socketcommon.__socket__
__implements__ = _socketcommon._implements
__extensions__ = _socketcommon.__extensions__
__imports__ = [i for i in _socketcommon.__imports__ if i not in _socketcommon.__py3_imports__]
__dns__ = _socketcommon.__dns__
try:
_fileobject = __socket__._fileobject
except AttributeError:
# Allow this module to be imported under Python 3
# for building the docs
_fileobject = object
else:
# Python 2 doesn't natively support with statements on _fileobject;
# but it substantially eases our test cases if we can do the same with on both Py3
# and Py2. (For this same reason we make the socket itself a context manager.)
# Implementation copied from Python 3
assert not hasattr(_fileobject, '__enter__')
# we could either patch in place:
#_fileobject.__enter__ = lambda self: self
#_fileobject.__exit__ = lambda self, *args: self.close() if not self.closed else None
# or we could subclass. subclassing has the benefit of not
# changing the behaviour of the stdlib if we're just imported; OTOH,
# under Python 2.6/2.7, test_urllib2net.py asserts that the class IS
# socket._fileobject (sigh), so we have to work around that.
# We also make it call our custom socket closing method that disposes
# of IO watchers but not the actual socket itself.
# Python 2 relies on reference counting to close sockets, so this is all
# very ugly and fragile.
class _fileobject(_fileobject): # pylint:disable=function-redefined
__slots__ = (
'__weakref__',
)
def __enter__(self):
return self
def __exit__(self, *args):
if not self.closed:
self.close()
def close(self):
if self._sock is not None:
self._sock._drop_events_and_close(closefd=False)
super(_fileobject, self).close()
class _closedsocket(object):
__slots__ = ()
def _dummy(*args, **kwargs): # pylint:disable=no-method-argument,unused-argument
raise error(EBADF, 'Bad file descriptor')
# All _delegate_methods must also be initialized here.
send = recv = recv_into = sendto = recvfrom = recvfrom_into = _dummy
def __nonzero__(self):
return False
__bool__ = __nonzero__
if PYPY:
def _drop(self):
pass
def _reuse(self):
pass
__getattr__ = _dummy
gtype = type
_Base = _socketcommon.SocketMixin
class socket(_Base):
"""
gevent `socket.socket <https://docs.python.org/2/library/socket.html#socket-objects>`_
for Python 2.
This object should have the same API as the standard library socket linked to above. Not all
methods are specifically documented here; when they are they may point out a difference
to be aware of or may document a method the standard library does not.
.. versionchanged:: 1.5.0
This object is a context manager, returning itself, like in Python 3.
"""
# pylint:disable=too-many-public-methods
__slots__ = (
)
def __init__(self, family=AF_INET, type=SOCK_STREAM, proto=0, _sock=None):
_Base.__init__(self)
timeout = _socket.getdefaulttimeout()
if _sock is None:
self._sock = _realsocket(family, type, proto)
else:
if hasattr(_sock, '_sock'):
timeout = getattr(_sock, 'timeout', timeout)
while hasattr(_sock, '_sock'):
# passed a gevent socket or a native
# socket._socketobject. Unwrap this all the way to the
# native _socket.socket.
_sock = _sock._sock
self._sock = _sock
if PYPY:
self._sock._reuse()
self.timeout = timeout
self._sock.setblocking(0)
fileno = self._sock.fileno()
self.hub = get_hub()
io = self.hub.loop.io
self._read_event = io(fileno, 1)
self._write_event = io(fileno, 2)
def __enter__(self):
return self
def __exit__(self, t, v, tb):
self.close()
def __repr__(self):
return '<%s at %s %s>' % (type(self).__name__, hex(id(self)), self._formatinfo())
def __str__(self):
return '<%s %s>' % (type(self).__name__, self._formatinfo())
def _formatinfo(self):
# pylint:disable=broad-except
try:
fileno = self.fileno()
except Exception as ex:
fileno = str(ex)
try:
sockname = self.getsockname()
sockname = '%s:%s' % sockname
except Exception:
sockname = None
try:
peername = self.getpeername()
peername = '%s:%s' % peername
except Exception:
peername = None
result = 'fileno=%s' % fileno
if sockname is not None:
result += ' sock=' + str(sockname)
if peername is not None:
result += ' peer=' + str(peername)
if getattr(self, 'timeout', None) is not None:
result += ' timeout=' + str(self.timeout)
return result
def accept(self):
while 1:
try:
client_socket, address = self._sock.accept()
break
except error as ex:
if ex.args[0] != EWOULDBLOCK or self.timeout == 0.0:
raise
sys.exc_clear()
self._wait(self._read_event)
sockobj = socket(_sock=client_socket)
if PYPY:
client_socket._drop()
return sockobj, address
def _drop_ref_on_close(self, sock):
# See the same method in _socket3.py. We just can't be as deterministic
# as we can on Python 3.
scheduled_new = self.hub.loop.closing_fd(sock.fileno())
if PYPY:
meth = sock._drop
else:
meth = sock.fileno # Still keep it alive if we need to
if scheduled_new:
self.hub.loop.run_callback(meth)
else:
meth()
def close(self, _closedsocket=_closedsocket):
if not self._sock:
return
# This function should not reference any globals. See Python issue #808164.
# First, break any reference to the loop.io objects. Our
# fileno, which they were tied to, is about to be free to be
# reused, so these objects are no longer functional.
self._drop_events_and_close()
# Next, change self._sock. On CPython, this drops a
# reference, and if it was the last reference, __del__ will
# close it. (We cannot close it, makefile() relies on
# reference counting like this, and it may be shared among
# multiple wrapper objects). Methods *must not* cache
# `self._sock` separately from
# self._write_event/self._read_event, or they will be out of
# sync and we may get inappropriate errors. (See
# test__hub:TestCloseSocketWhilePolling for an example).
self._sock = _closedsocket()
@property
def closed(self):
return isinstance(self._sock, _closedsocket)
def dup(self):
"""dup() -> socket object
Return a new socket object connected to the same system resource.
Note, that the new socket does not inherit the timeout."""
return socket(_sock=self._sock)
def makefile(self, mode='r', bufsize=-1):
# Two things to look out for:
# 1) Closing the original socket object should not close the
# fileobject (hence creating a new socket instance);
# An alternate approach is what _socket3.py does, which is to
# keep count of the times makefile objects have been opened (Py3's
# SocketIO helps with that). But the newly created socket, which
# has its own read/write watchers, does need those to be closed
# when the fileobject is; our custom subclass does that. Note that
# we can't pass the 'close=True' argument, as that causes reference counts
# to get screwed up, and Python2 sockets rely on those.
# 2) The resulting fileobject must keep the timeout in order
# to be compatible with the stdlib's socket.makefile.
# Pass self as _sock to preserve timeout.
fobj = _fileobject(type(self)(_sock=self), mode, bufsize)
if PYPY:
self._sock._drop()
return fobj
def sendall(self, data, flags=0):
if isinstance(data, unicode):
data = data.encode()
return _Base.sendall(self, data, flags)
if PYPY:
def _reuse(self):
self._sock._reuse()
def _drop(self):
self._sock._drop()
SocketType = socket
if hasattr(_socket, 'socketpair'):
# The native, low-level socketpair returns
# low-level objects
def socketpair(family=getattr(_socket, 'AF_UNIX', _socket.AF_INET),
type=_socket.SOCK_STREAM, proto=0):
one, two = _socket.socketpair(family, type, proto)
result = socket(_sock=one), socket(_sock=two)
if PYPY:
one._drop()
two._drop()
return result
elif hasattr(__socket__, 'socketpair'):
# The high-level backport uses high-level socket APIs. It works
# cooperatively automatically if we're monkey-patched,
# else we must do it ourself.
_orig_socketpair = __socket__.socketpair
def socketpair(family=_socket.AF_INET, type=_socket.SOCK_STREAM, proto=0):
one, two = _orig_socketpair(family, type, proto)
if not isinstance(one, socket):
one = socket(_sock=one)
two = socket(_sock=two)
if PYPY:
one._drop()
two._drop()
return one, two
elif 'socketpair' in __implements__:
__implements__.remove('socketpair')
if hasattr(_socket, 'fromfd'):
def fromfd(fd, family, type, proto=0):
s = _socket.fromfd(fd, family, type, proto)
result = socket(_sock=s)
if PYPY:
s._drop()
return result
elif 'fromfd' in __implements__:
__implements__.remove('fromfd')
if hasattr(__socket__, 'ssl'):
def ssl(sock, keyfile=None, certfile=None):
# deprecated in 2.7.9 but still present;
# sometimes backported by distros. See ssl.py
# Note that we import gevent.ssl, not _ssl2, to get the correct
# version.
from gevent import ssl as _sslmod
# wrap_socket is 2.7.9/backport, sslwrap_simple is older. They take
# the same arguments.
wrap = getattr(_sslmod, 'wrap_socket', None) or getattr(_sslmod, 'sslwrap_simple')
return wrap(sock, keyfile, certfile)
__implements__.append('ssl')
if hasattr(__socket__, 'sethostname'):
# This was added in 3.3, but PyPy 2.7-7.3.2
# leaked it back into Python 2.
sethostname = __socket__.sethostname
__imports__.append('sethostname')
__all__ = __implements__ + __extensions__ + __imports__