mirror of
https://github.com/python/cpython.git
synced 2024-11-27 15:27:06 +01:00
626 lines
23 KiB
Python
626 lines
23 KiB
Python
r"""UUID objects (universally unique identifiers) according to RFC 4122.
|
|
|
|
This module provides immutable UUID objects (class UUID) and the functions
|
|
uuid1(), uuid3(), uuid4(), uuid5() for generating version 1, 3, 4, and 5
|
|
UUIDs as specified in RFC 4122.
|
|
|
|
If all you want is a unique ID, you should probably call uuid1() or uuid4().
|
|
Note that uuid1() may compromise privacy since it creates a UUID containing
|
|
the computer's network address. uuid4() creates a random UUID.
|
|
|
|
Typical usage:
|
|
|
|
>>> import uuid
|
|
|
|
# make a UUID based on the host ID and current time
|
|
>>> uuid.uuid1() # doctest: +SKIP
|
|
UUID('a8098c1a-f86e-11da-bd1a-00112444be1e')
|
|
|
|
# make a UUID using an MD5 hash of a namespace UUID and a name
|
|
>>> uuid.uuid3(uuid.NAMESPACE_DNS, 'python.org')
|
|
UUID('6fa459ea-ee8a-3ca4-894e-db77e160355e')
|
|
|
|
# make a random UUID
|
|
>>> uuid.uuid4() # doctest: +SKIP
|
|
UUID('16fd2706-8baf-433b-82eb-8c7fada847da')
|
|
|
|
# make a UUID using a SHA-1 hash of a namespace UUID and a name
|
|
>>> uuid.uuid5(uuid.NAMESPACE_DNS, 'python.org')
|
|
UUID('886313e1-3b8a-5372-9b90-0c9aee199e5d')
|
|
|
|
# make a UUID from a string of hex digits (braces and hyphens ignored)
|
|
>>> x = uuid.UUID('{00010203-0405-0607-0809-0a0b0c0d0e0f}')
|
|
|
|
# convert a UUID to a string of hex digits in standard form
|
|
>>> str(x)
|
|
'00010203-0405-0607-0809-0a0b0c0d0e0f'
|
|
|
|
# get the raw 16 bytes of the UUID
|
|
>>> x.bytes
|
|
b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f'
|
|
|
|
# make a UUID from a 16-byte string
|
|
>>> uuid.UUID(bytes=x.bytes)
|
|
UUID('00010203-0405-0607-0809-0a0b0c0d0e0f')
|
|
"""
|
|
|
|
__author__ = 'Ka-Ping Yee <ping@zesty.ca>'
|
|
|
|
RESERVED_NCS, RFC_4122, RESERVED_MICROSOFT, RESERVED_FUTURE = [
|
|
'reserved for NCS compatibility', 'specified in RFC 4122',
|
|
'reserved for Microsoft compatibility', 'reserved for future definition']
|
|
|
|
int_ = int # The built-in int type
|
|
bytes_ = bytes # The built-in bytes type
|
|
|
|
class UUID(object):
|
|
"""Instances of the UUID class represent UUIDs as specified in RFC 4122.
|
|
UUID objects are immutable, hashable, and usable as dictionary keys.
|
|
Converting a UUID to a string with str() yields something in the form
|
|
'12345678-1234-1234-1234-123456789abc'. The UUID constructor accepts
|
|
five possible forms: a similar string of hexadecimal digits, or a tuple
|
|
of six integer fields (with 32-bit, 16-bit, 16-bit, 8-bit, 8-bit, and
|
|
48-bit values respectively) as an argument named 'fields', or a string
|
|
of 16 bytes (with all the integer fields in big-endian order) as an
|
|
argument named 'bytes', or a string of 16 bytes (with the first three
|
|
fields in little-endian order) as an argument named 'bytes_le', or a
|
|
single 128-bit integer as an argument named 'int'.
|
|
|
|
UUIDs have these read-only attributes:
|
|
|
|
bytes the UUID as a 16-byte string (containing the six
|
|
integer fields in big-endian byte order)
|
|
|
|
bytes_le the UUID as a 16-byte string (with time_low, time_mid,
|
|
and time_hi_version in little-endian byte order)
|
|
|
|
fields a tuple of the six integer fields of the UUID,
|
|
which are also available as six individual attributes
|
|
and two derived attributes:
|
|
|
|
time_low the first 32 bits of the UUID
|
|
time_mid the next 16 bits of the UUID
|
|
time_hi_version the next 16 bits of the UUID
|
|
clock_seq_hi_variant the next 8 bits of the UUID
|
|
clock_seq_low the next 8 bits of the UUID
|
|
node the last 48 bits of the UUID
|
|
|
|
time the 60-bit timestamp
|
|
clock_seq the 14-bit sequence number
|
|
|
|
hex the UUID as a 32-character hexadecimal string
|
|
|
|
int the UUID as a 128-bit integer
|
|
|
|
urn the UUID as a URN as specified in RFC 4122
|
|
|
|
variant the UUID variant (one of the constants RESERVED_NCS,
|
|
RFC_4122, RESERVED_MICROSOFT, or RESERVED_FUTURE)
|
|
|
|
version the UUID version number (1 through 5, meaningful only
|
|
when the variant is RFC_4122)
|
|
"""
|
|
|
|
def __init__(self, hex=None, bytes=None, bytes_le=None, fields=None,
|
|
int=None, version=None):
|
|
r"""Create a UUID from either a string of 32 hexadecimal digits,
|
|
a string of 16 bytes as the 'bytes' argument, a string of 16 bytes
|
|
in little-endian order as the 'bytes_le' argument, a tuple of six
|
|
integers (32-bit time_low, 16-bit time_mid, 16-bit time_hi_version,
|
|
8-bit clock_seq_hi_variant, 8-bit clock_seq_low, 48-bit node) as
|
|
the 'fields' argument, or a single 128-bit integer as the 'int'
|
|
argument. When a string of hex digits is given, curly braces,
|
|
hyphens, and a URN prefix are all optional. For example, these
|
|
expressions all yield the same UUID:
|
|
|
|
UUID('{12345678-1234-5678-1234-567812345678}')
|
|
UUID('12345678123456781234567812345678')
|
|
UUID('urn:uuid:12345678-1234-5678-1234-567812345678')
|
|
UUID(bytes='\x12\x34\x56\x78'*4)
|
|
UUID(bytes_le='\x78\x56\x34\x12\x34\x12\x78\x56' +
|
|
'\x12\x34\x56\x78\x12\x34\x56\x78')
|
|
UUID(fields=(0x12345678, 0x1234, 0x5678, 0x12, 0x34, 0x567812345678))
|
|
UUID(int=0x12345678123456781234567812345678)
|
|
|
|
Exactly one of 'hex', 'bytes', 'bytes_le', 'fields', or 'int' must
|
|
be given. The 'version' argument is optional; if given, the resulting
|
|
UUID will have its variant and version set according to RFC 4122,
|
|
overriding the given 'hex', 'bytes', 'bytes_le', 'fields', or 'int'.
|
|
"""
|
|
|
|
if [hex, bytes, bytes_le, fields, int].count(None) != 4:
|
|
raise TypeError('need one of hex, bytes, bytes_le, fields, or int')
|
|
if hex is not None:
|
|
hex = hex.replace('urn:', '').replace('uuid:', '')
|
|
hex = hex.strip('{}').replace('-', '')
|
|
if len(hex) != 32:
|
|
raise ValueError('badly formed hexadecimal UUID string')
|
|
int = int_(hex, 16)
|
|
if bytes_le is not None:
|
|
if len(bytes_le) != 16:
|
|
raise ValueError('bytes_le is not a 16-char string')
|
|
bytes = (bytes_le[4-1::-1] + bytes_le[6-1:4-1:-1] +
|
|
bytes_le[8-1:6-1:-1] + bytes_le[8:])
|
|
if bytes is not None:
|
|
if len(bytes) != 16:
|
|
raise ValueError('bytes is not a 16-char string')
|
|
assert isinstance(bytes, bytes_), repr(bytes)
|
|
int = int_.from_bytes(bytes, byteorder='big')
|
|
if fields is not None:
|
|
if len(fields) != 6:
|
|
raise ValueError('fields is not a 6-tuple')
|
|
(time_low, time_mid, time_hi_version,
|
|
clock_seq_hi_variant, clock_seq_low, node) = fields
|
|
if not 0 <= time_low < 1<<32:
|
|
raise ValueError('field 1 out of range (need a 32-bit value)')
|
|
if not 0 <= time_mid < 1<<16:
|
|
raise ValueError('field 2 out of range (need a 16-bit value)')
|
|
if not 0 <= time_hi_version < 1<<16:
|
|
raise ValueError('field 3 out of range (need a 16-bit value)')
|
|
if not 0 <= clock_seq_hi_variant < 1<<8:
|
|
raise ValueError('field 4 out of range (need an 8-bit value)')
|
|
if not 0 <= clock_seq_low < 1<<8:
|
|
raise ValueError('field 5 out of range (need an 8-bit value)')
|
|
if not 0 <= node < 1<<48:
|
|
raise ValueError('field 6 out of range (need a 48-bit value)')
|
|
clock_seq = (clock_seq_hi_variant << 8) | clock_seq_low
|
|
int = ((time_low << 96) | (time_mid << 80) |
|
|
(time_hi_version << 64) | (clock_seq << 48) | node)
|
|
if int is not None:
|
|
if not 0 <= int < 1<<128:
|
|
raise ValueError('int is out of range (need a 128-bit value)')
|
|
if version is not None:
|
|
if not 1 <= version <= 5:
|
|
raise ValueError('illegal version number')
|
|
# Set the variant to RFC 4122.
|
|
int &= ~(0xc000 << 48)
|
|
int |= 0x8000 << 48
|
|
# Set the version number.
|
|
int &= ~(0xf000 << 64)
|
|
int |= version << 76
|
|
self.__dict__['int'] = int
|
|
|
|
def __eq__(self, other):
|
|
if isinstance(other, UUID):
|
|
return self.int == other.int
|
|
return NotImplemented
|
|
|
|
# Q. What's the value of being able to sort UUIDs?
|
|
# A. Use them as keys in a B-Tree or similar mapping.
|
|
|
|
def __lt__(self, other):
|
|
if isinstance(other, UUID):
|
|
return self.int < other.int
|
|
return NotImplemented
|
|
|
|
def __gt__(self, other):
|
|
if isinstance(other, UUID):
|
|
return self.int > other.int
|
|
return NotImplemented
|
|
|
|
def __le__(self, other):
|
|
if isinstance(other, UUID):
|
|
return self.int <= other.int
|
|
return NotImplemented
|
|
|
|
def __ge__(self, other):
|
|
if isinstance(other, UUID):
|
|
return self.int >= other.int
|
|
return NotImplemented
|
|
|
|
def __hash__(self):
|
|
return hash(self.int)
|
|
|
|
def __int__(self):
|
|
return self.int
|
|
|
|
def __repr__(self):
|
|
return '%s(%r)' % (self.__class__.__name__, str(self))
|
|
|
|
def __setattr__(self, name, value):
|
|
raise TypeError('UUID objects are immutable')
|
|
|
|
def __str__(self):
|
|
hex = '%032x' % self.int
|
|
return '%s-%s-%s-%s-%s' % (
|
|
hex[:8], hex[8:12], hex[12:16], hex[16:20], hex[20:])
|
|
|
|
@property
|
|
def bytes(self):
|
|
return self.int.to_bytes(16, 'big')
|
|
|
|
@property
|
|
def bytes_le(self):
|
|
bytes = self.bytes
|
|
return (bytes[4-1::-1] + bytes[6-1:4-1:-1] + bytes[8-1:6-1:-1] +
|
|
bytes[8:])
|
|
|
|
@property
|
|
def fields(self):
|
|
return (self.time_low, self.time_mid, self.time_hi_version,
|
|
self.clock_seq_hi_variant, self.clock_seq_low, self.node)
|
|
|
|
@property
|
|
def time_low(self):
|
|
return self.int >> 96
|
|
|
|
@property
|
|
def time_mid(self):
|
|
return (self.int >> 80) & 0xffff
|
|
|
|
@property
|
|
def time_hi_version(self):
|
|
return (self.int >> 64) & 0xffff
|
|
|
|
@property
|
|
def clock_seq_hi_variant(self):
|
|
return (self.int >> 56) & 0xff
|
|
|
|
@property
|
|
def clock_seq_low(self):
|
|
return (self.int >> 48) & 0xff
|
|
|
|
@property
|
|
def time(self):
|
|
return (((self.time_hi_version & 0x0fff) << 48) |
|
|
(self.time_mid << 32) | self.time_low)
|
|
|
|
@property
|
|
def clock_seq(self):
|
|
return (((self.clock_seq_hi_variant & 0x3f) << 8) |
|
|
self.clock_seq_low)
|
|
|
|
@property
|
|
def node(self):
|
|
return self.int & 0xffffffffffff
|
|
|
|
@property
|
|
def hex(self):
|
|
return '%032x' % self.int
|
|
|
|
@property
|
|
def urn(self):
|
|
return 'urn:uuid:' + str(self)
|
|
|
|
@property
|
|
def variant(self):
|
|
if not self.int & (0x8000 << 48):
|
|
return RESERVED_NCS
|
|
elif not self.int & (0x4000 << 48):
|
|
return RFC_4122
|
|
elif not self.int & (0x2000 << 48):
|
|
return RESERVED_MICROSOFT
|
|
else:
|
|
return RESERVED_FUTURE
|
|
|
|
@property
|
|
def version(self):
|
|
# The version bits are only meaningful for RFC 4122 UUIDs.
|
|
if self.variant == RFC_4122:
|
|
return int((self.int >> 76) & 0xf)
|
|
|
|
def _popen(command, *args):
|
|
import os, shutil, subprocess
|
|
executable = shutil.which(command)
|
|
if executable is None:
|
|
path = os.pathsep.join(('/sbin', '/usr/sbin'))
|
|
executable = shutil.which(command, path=path)
|
|
if executable is None:
|
|
return None
|
|
# LC_ALL=C to ensure English output, stderr=DEVNULL to prevent output
|
|
# on stderr (Note: we don't have an example where the words we search
|
|
# for are actually localized, but in theory some system could do so.)
|
|
env = dict(os.environ)
|
|
env['LC_ALL'] = 'C'
|
|
proc = subprocess.Popen((executable,) + args,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.DEVNULL,
|
|
env=env)
|
|
return proc
|
|
|
|
def _find_mac(command, args, hw_identifiers, get_index):
|
|
try:
|
|
proc = _popen(command, *args.split())
|
|
if not proc:
|
|
return
|
|
with proc:
|
|
for line in proc.stdout:
|
|
words = line.lower().rstrip().split()
|
|
for i in range(len(words)):
|
|
if words[i] in hw_identifiers:
|
|
try:
|
|
word = words[get_index(i)]
|
|
mac = int(word.replace(b':', b''), 16)
|
|
if mac:
|
|
return mac
|
|
except (ValueError, IndexError):
|
|
# Virtual interfaces, such as those provided by
|
|
# VPNs, do not have a colon-delimited MAC address
|
|
# as expected, but a 16-byte HWAddr separated by
|
|
# dashes. These should be ignored in favor of a
|
|
# real MAC address
|
|
pass
|
|
except OSError:
|
|
pass
|
|
|
|
def _ifconfig_getnode():
|
|
"""Get the hardware address on Unix by running ifconfig."""
|
|
# This works on Linux ('' or '-a'), Tru64 ('-av'), but not all Unixes.
|
|
for args in ('', '-a', '-av'):
|
|
mac = _find_mac('ifconfig', args, [b'hwaddr', b'ether'], lambda i: i+1)
|
|
if mac:
|
|
return mac
|
|
|
|
def _ip_getnode():
|
|
"""Get the hardware address on Unix by running ip."""
|
|
# This works on Linux with iproute2.
|
|
mac = _find_mac('ip', 'link list', [b'link/ether'], lambda i: i+1)
|
|
if mac:
|
|
return mac
|
|
|
|
def _arp_getnode():
|
|
"""Get the hardware address on Unix by running arp."""
|
|
import os, socket
|
|
try:
|
|
ip_addr = socket.gethostbyname(socket.gethostname())
|
|
except OSError:
|
|
return None
|
|
|
|
# Try getting the MAC addr from arp based on our IP address (Solaris).
|
|
return _find_mac('arp', '-an', [os.fsencode(ip_addr)], lambda i: -1)
|
|
|
|
def _lanscan_getnode():
|
|
"""Get the hardware address on Unix by running lanscan."""
|
|
# This might work on HP-UX.
|
|
return _find_mac('lanscan', '-ai', [b'lan0'], lambda i: 0)
|
|
|
|
def _netstat_getnode():
|
|
"""Get the hardware address on Unix by running netstat."""
|
|
# This might work on AIX, Tru64 UNIX and presumably on IRIX.
|
|
try:
|
|
proc = _popen('netstat', '-ia')
|
|
if not proc:
|
|
return
|
|
with proc:
|
|
words = proc.stdout.readline().rstrip().split()
|
|
try:
|
|
i = words.index(b'Address')
|
|
except ValueError:
|
|
return
|
|
for line in proc.stdout:
|
|
try:
|
|
words = line.rstrip().split()
|
|
word = words[i]
|
|
if len(word) == 17 and word.count(b':') == 5:
|
|
mac = int(word.replace(b':', b''), 16)
|
|
if mac:
|
|
return mac
|
|
except (ValueError, IndexError):
|
|
pass
|
|
except OSError:
|
|
pass
|
|
|
|
def _ipconfig_getnode():
|
|
"""Get the hardware address on Windows by running ipconfig.exe."""
|
|
import os, re
|
|
dirs = ['', r'c:\windows\system32', r'c:\winnt\system32']
|
|
try:
|
|
import ctypes
|
|
buffer = ctypes.create_string_buffer(300)
|
|
ctypes.windll.kernel32.GetSystemDirectoryA(buffer, 300)
|
|
dirs.insert(0, buffer.value.decode('mbcs'))
|
|
except:
|
|
pass
|
|
for dir in dirs:
|
|
try:
|
|
pipe = os.popen(os.path.join(dir, 'ipconfig') + ' /all')
|
|
except OSError:
|
|
continue
|
|
with pipe:
|
|
for line in pipe:
|
|
value = line.split(':')[-1].strip().lower()
|
|
if re.match('([0-9a-f][0-9a-f]-){5}[0-9a-f][0-9a-f]', value):
|
|
return int(value.replace('-', ''), 16)
|
|
|
|
def _netbios_getnode():
|
|
"""Get the hardware address on Windows using NetBIOS calls.
|
|
See http://support.microsoft.com/kb/118623 for details."""
|
|
import win32wnet, netbios
|
|
ncb = netbios.NCB()
|
|
ncb.Command = netbios.NCBENUM
|
|
ncb.Buffer = adapters = netbios.LANA_ENUM()
|
|
adapters._pack()
|
|
if win32wnet.Netbios(ncb) != 0:
|
|
return
|
|
adapters._unpack()
|
|
for i in range(adapters.length):
|
|
ncb.Reset()
|
|
ncb.Command = netbios.NCBRESET
|
|
ncb.Lana_num = ord(adapters.lana[i])
|
|
if win32wnet.Netbios(ncb) != 0:
|
|
continue
|
|
ncb.Reset()
|
|
ncb.Command = netbios.NCBASTAT
|
|
ncb.Lana_num = ord(adapters.lana[i])
|
|
ncb.Callname = '*'.ljust(16)
|
|
ncb.Buffer = status = netbios.ADAPTER_STATUS()
|
|
if win32wnet.Netbios(ncb) != 0:
|
|
continue
|
|
status._unpack()
|
|
bytes = status.adapter_address[:6]
|
|
if len(bytes) != 6:
|
|
continue
|
|
return int.from_bytes(bytes, 'big')
|
|
|
|
# Thanks to Thomas Heller for ctypes and for his help with its use here.
|
|
|
|
# If ctypes is available, use it to find system routines for UUID generation.
|
|
# XXX This makes the module non-thread-safe!
|
|
_uuid_generate_random = _uuid_generate_time = _UuidCreate = None
|
|
try:
|
|
import ctypes, ctypes.util
|
|
|
|
# The uuid_generate_* routines are provided by libuuid on at least
|
|
# Linux and FreeBSD, and provided by libc on Mac OS X.
|
|
for libname in ['uuid', 'c']:
|
|
try:
|
|
lib = ctypes.CDLL(ctypes.util.find_library(libname))
|
|
except:
|
|
continue
|
|
if hasattr(lib, 'uuid_generate_random'):
|
|
_uuid_generate_random = lib.uuid_generate_random
|
|
if hasattr(lib, 'uuid_generate_time'):
|
|
_uuid_generate_time = lib.uuid_generate_time
|
|
if _uuid_generate_random is not None:
|
|
break # found everything we were looking for
|
|
|
|
# The uuid_generate_* functions are broken on MacOS X 10.5, as noted
|
|
# in issue #8621 the function generates the same sequence of values
|
|
# in the parent process and all children created using fork (unless
|
|
# those children use exec as well).
|
|
#
|
|
# Assume that the uuid_generate functions are broken from 10.5 onward,
|
|
# the test can be adjusted when a later version is fixed.
|
|
import sys
|
|
if sys.platform == 'darwin':
|
|
import os
|
|
if int(os.uname().release.split('.')[0]) >= 9:
|
|
_uuid_generate_random = _uuid_generate_time = None
|
|
|
|
# On Windows prior to 2000, UuidCreate gives a UUID containing the
|
|
# hardware address. On Windows 2000 and later, UuidCreate makes a
|
|
# random UUID and UuidCreateSequential gives a UUID containing the
|
|
# hardware address. These routines are provided by the RPC runtime.
|
|
# NOTE: at least on Tim's WinXP Pro SP2 desktop box, while the last
|
|
# 6 bytes returned by UuidCreateSequential are fixed, they don't appear
|
|
# to bear any relationship to the MAC address of any network device
|
|
# on the box.
|
|
try:
|
|
lib = ctypes.windll.rpcrt4
|
|
except:
|
|
lib = None
|
|
_UuidCreate = getattr(lib, 'UuidCreateSequential',
|
|
getattr(lib, 'UuidCreate', None))
|
|
except:
|
|
pass
|
|
|
|
def _unixdll_getnode():
|
|
"""Get the hardware address on Unix using ctypes."""
|
|
_buffer = ctypes.create_string_buffer(16)
|
|
_uuid_generate_time(_buffer)
|
|
return UUID(bytes=bytes_(_buffer.raw)).node
|
|
|
|
def _windll_getnode():
|
|
"""Get the hardware address on Windows using ctypes."""
|
|
_buffer = ctypes.create_string_buffer(16)
|
|
if _UuidCreate(_buffer) == 0:
|
|
return UUID(bytes=bytes_(_buffer.raw)).node
|
|
|
|
def _random_getnode():
|
|
"""Get a random node ID, with eighth bit set as suggested by RFC 4122."""
|
|
import random
|
|
return random.getrandbits(48) | 0x010000000000
|
|
|
|
_node = None
|
|
|
|
def getnode():
|
|
"""Get the hardware address as a 48-bit positive integer.
|
|
|
|
The first time this runs, it may launch a separate program, which could
|
|
be quite slow. If all attempts to obtain the hardware address fail, we
|
|
choose a random 48-bit number with its eighth bit set to 1 as recommended
|
|
in RFC 4122.
|
|
"""
|
|
|
|
global _node
|
|
if _node is not None:
|
|
return _node
|
|
|
|
import sys
|
|
if sys.platform == 'win32':
|
|
getters = [_windll_getnode, _netbios_getnode, _ipconfig_getnode]
|
|
else:
|
|
getters = [_unixdll_getnode, _ifconfig_getnode, _ip_getnode,
|
|
_arp_getnode, _lanscan_getnode, _netstat_getnode]
|
|
|
|
for getter in getters + [_random_getnode]:
|
|
try:
|
|
_node = getter()
|
|
except:
|
|
continue
|
|
if _node is not None:
|
|
return _node
|
|
|
|
_last_timestamp = None
|
|
|
|
def uuid1(node=None, clock_seq=None):
|
|
"""Generate a UUID from a host ID, sequence number, and the current time.
|
|
If 'node' is not given, getnode() is used to obtain the hardware
|
|
address. If 'clock_seq' is given, it is used as the sequence number;
|
|
otherwise a random 14-bit sequence number is chosen."""
|
|
|
|
# When the system provides a version-1 UUID generator, use it (but don't
|
|
# use UuidCreate here because its UUIDs don't conform to RFC 4122).
|
|
if _uuid_generate_time and node is clock_seq is None:
|
|
_buffer = ctypes.create_string_buffer(16)
|
|
_uuid_generate_time(_buffer)
|
|
return UUID(bytes=bytes_(_buffer.raw))
|
|
|
|
global _last_timestamp
|
|
import time
|
|
nanoseconds = int(time.time() * 1e9)
|
|
# 0x01b21dd213814000 is the number of 100-ns intervals between the
|
|
# UUID epoch 1582-10-15 00:00:00 and the Unix epoch 1970-01-01 00:00:00.
|
|
timestamp = int(nanoseconds/100) + 0x01b21dd213814000
|
|
if _last_timestamp is not None and timestamp <= _last_timestamp:
|
|
timestamp = _last_timestamp + 1
|
|
_last_timestamp = timestamp
|
|
if clock_seq is None:
|
|
import random
|
|
clock_seq = random.getrandbits(14) # instead of stable storage
|
|
time_low = timestamp & 0xffffffff
|
|
time_mid = (timestamp >> 32) & 0xffff
|
|
time_hi_version = (timestamp >> 48) & 0x0fff
|
|
clock_seq_low = clock_seq & 0xff
|
|
clock_seq_hi_variant = (clock_seq >> 8) & 0x3f
|
|
if node is None:
|
|
node = getnode()
|
|
return UUID(fields=(time_low, time_mid, time_hi_version,
|
|
clock_seq_hi_variant, clock_seq_low, node), version=1)
|
|
|
|
def uuid3(namespace, name):
|
|
"""Generate a UUID from the MD5 hash of a namespace UUID and a name."""
|
|
from hashlib import md5
|
|
hash = md5(namespace.bytes + bytes(name, "utf-8")).digest()
|
|
return UUID(bytes=hash[:16], version=3)
|
|
|
|
def uuid4():
|
|
"""Generate a random UUID."""
|
|
|
|
# When the system provides a version-4 UUID generator, use it.
|
|
if _uuid_generate_random:
|
|
_buffer = ctypes.create_string_buffer(16)
|
|
_uuid_generate_random(_buffer)
|
|
return UUID(bytes=bytes_(_buffer.raw))
|
|
|
|
# Otherwise, get randomness from urandom or the 'random' module.
|
|
try:
|
|
import os
|
|
return UUID(bytes=os.urandom(16), version=4)
|
|
except:
|
|
import random
|
|
return UUID(int=random.getrandbits(128), version=4)
|
|
|
|
def uuid5(namespace, name):
|
|
"""Generate a UUID from the SHA-1 hash of a namespace UUID and a name."""
|
|
from hashlib import sha1
|
|
hash = sha1(namespace.bytes + bytes(name, "utf-8")).digest()
|
|
return UUID(bytes=hash[:16], version=5)
|
|
|
|
# The following standard UUIDs are for use with uuid3() or uuid5().
|
|
|
|
NAMESPACE_DNS = UUID('6ba7b810-9dad-11d1-80b4-00c04fd430c8')
|
|
NAMESPACE_URL = UUID('6ba7b811-9dad-11d1-80b4-00c04fd430c8')
|
|
NAMESPACE_OID = UUID('6ba7b812-9dad-11d1-80b4-00c04fd430c8')
|
|
NAMESPACE_X500 = UUID('6ba7b814-9dad-11d1-80b4-00c04fd430c8')
|