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"""Platform compatibility."""
from __future__ import absolute_import, unicode_literals
import platform
import re
import struct
import sys
# Jython does not have this attribute
try:
from socket import SOL_TCP
except ImportError: # pragma: no cover
from socket import IPPROTO_TCP as SOL_TCP # noqa
RE_NUM = re.compile(r'(\d+).+')
def _linux_version_to_tuple(s):
# type: (str) -> Tuple[int, int, int]
return tuple(map(_versionatom, s.split('.')[:3]))
def _versionatom(s):
# type: (str) -> int
if s.isdigit():
return int(s)
match = RE_NUM.match(s)
return int(match.groups()[0]) if match else 0
# available socket options for TCP level
KNOWN_TCP_OPTS = {
'TCP_CORK', 'TCP_DEFER_ACCEPT', 'TCP_KEEPCNT',
'TCP_KEEPIDLE', 'TCP_KEEPINTVL', 'TCP_LINGER2',
'TCP_MAXSEG', 'TCP_NODELAY', 'TCP_QUICKACK',
'TCP_SYNCNT', 'TCP_USER_TIMEOUT', 'TCP_WINDOW_CLAMP',
}
LINUX_VERSION = None
if sys.platform.startswith('linux'):
LINUX_VERSION = _linux_version_to_tuple(platform.release())
if LINUX_VERSION < (2, 6, 37):
KNOWN_TCP_OPTS.remove('TCP_USER_TIMEOUT')
# Windows Subsystem for Linux is an edge-case: the Python socket library
# returns most TCP_* enums, but they aren't actually supported
if platform.release().endswith("Microsoft"):
KNOWN_TCP_OPTS = {'TCP_NODELAY', 'TCP_KEEPIDLE', 'TCP_KEEPINTVL',
'TCP_KEEPCNT'}
elif sys.platform.startswith('darwin'):
KNOWN_TCP_OPTS.remove('TCP_USER_TIMEOUT')
elif 'bsd' in sys.platform:
KNOWN_TCP_OPTS.remove('TCP_USER_TIMEOUT')
# According to MSDN Windows platforms support getsockopt(TCP_MAXSSEG) but not
# setsockopt(TCP_MAXSEG) on IPPROTO_TCP sockets.
elif sys.platform.startswith('win'):
KNOWN_TCP_OPTS = {'TCP_NODELAY'}
if sys.version_info < (2, 7, 7): # pragma: no cover
import functools
def _to_bytes_arg(fun):
@functools.wraps(fun)
def _inner(s, *args, **kwargs):
return fun(s.encode(), *args, **kwargs)
return _inner
pack = _to_bytes_arg(struct.pack)
pack_into = _to_bytes_arg(struct.pack_into)
unpack = _to_bytes_arg(struct.unpack)
unpack_from = _to_bytes_arg(struct.unpack_from)
else:
pack = struct.pack
pack_into = struct.pack_into
unpack = struct.unpack
unpack_from = struct.unpack_from
__all__ = [
'LINUX_VERSION',
'SOL_TCP',
'KNOWN_TCP_OPTS',
'pack',
'pack_into',
'unpack',
'unpack_from',
]
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