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gh-89083: add support for UUID version 8 (RFC 9562) (#123224)

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Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
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Bénédikt Tran 2024-11-12 19:08:49 +01:00 committed by GitHub
parent a83472f49b
commit 03924b5dee
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5 changed files with 109 additions and 19 deletions
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42
Doc/library/uuid.rst
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@ -1,8 +1,8 @@
:mod:`!uuid` --- UUID objects according to :rfc:`4122`
:mod:`!uuid` --- UUID objects according to :rfc:`9562`
======================================================
.. module:: uuid
:synopsis: UUID objects (universally unique identifiers) according to RFC 4122
:synopsis: UUID objects (universally unique identifiers) according to RFC 9562
.. moduleauthor:: Ka-Ping Yee <ping@zesty.ca>
.. sectionauthor:: George Yoshida <quiver@users.sourceforge.net>
@ -12,7 +12,8 @@
This module provides immutable :class:`UUID` objects (the :class:`UUID` class)
and the functions :func:`uuid1`, :func:`uuid3`, :func:`uuid4`, :func:`uuid5` for
generating version 1, 3, 4, and 5 UUIDs as specified in :rfc:`4122`.
generating version 1, 3, 4, 5, and 8 UUIDs as specified in :rfc:`9562` (which
supersedes :rfc:`4122`).
If all you want is a unique ID, you should probably call :func:`uuid1` or
:func:`uuid4`. Note that :func:`uuid1` may compromise privacy since it creates
@ -65,7 +66,7 @@ which relays any information about the UUID's safety, using this enumeration:
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 number set according to :rfc:`4122`, overriding bits in the
variant and version number set according to :rfc:`9562`, overriding bits in the
given *hex*, *bytes*, *bytes_le*, *fields*, or *int*.
Comparison of UUID objects are made by way of comparing their
@ -137,7 +138,7 @@ which relays any information about the UUID's safety, using this enumeration:
.. attribute:: UUID.urn
The UUID as a URN as specified in :rfc:`4122`.
The UUID as a URN as specified in :rfc:`9562`.
.. attribute:: UUID.variant
@ -149,9 +150,13 @@ which relays any information about the UUID's safety, using this enumeration:
.. attribute:: UUID.version
The UUID version number (1 through 5, meaningful only when the variant is
The UUID version number (1 through 8, meaningful only when the variant is
:const:`RFC_4122`).
.. versionchanged:: next
Added UUID version 8.
.. attribute:: UUID.is_safe
An enumeration of :class:`SafeUUID` which indicates whether the platform
@ -216,6 +221,23 @@ The :mod:`uuid` module defines the following functions:
.. index:: single: uuid5
.. function:: uuid8(a=None, b=None, c=None)
Generate a pseudo-random UUID according to
:rfc:`RFC 9562, §5.8 <9562#section-5.8>`.
When specified, the parameters *a*, *b* and *c* are expected to be
positive integers of 48, 12 and 62 bits respectively. If they exceed
their expected bit count, only their least significant bits are kept;
non-specified arguments are substituted for a pseudo-random integer of
appropriate size.
.. versionadded:: next
.. index:: single: uuid8
The :mod:`uuid` module defines the following namespace identifiers for use with
:func:`uuid3` or :func:`uuid5`.
@ -252,7 +274,9 @@ of the :attr:`~UUID.variant` attribute:
.. data:: RFC_4122
Specifies the UUID layout given in :rfc:`4122`.
Specifies the UUID layout given in :rfc:`4122`. This constant is kept
for backward compatibility even though :rfc:`4122` has been superseded
by :rfc:`9562`.
.. data:: RESERVED_MICROSOFT
@ -267,7 +291,7 @@ of the :attr:`~UUID.variant` attribute:
.. seealso::
:rfc:`4122` - A Universally Unique IDentifier (UUID) URN Namespace
:rfc:`9562` - A Universally Unique IDentifier (UUID) URN Namespace
This specification defines a Uniform Resource Name namespace for UUIDs, the
internal format of UUIDs, and methods of generating UUIDs.
@ -283,7 +307,7 @@ The :mod:`uuid` module can be executed as a script from the command line.
.. code-block:: sh
python -m uuid [-h] [-u {uuid1,uuid3,uuid4,uuid5}] [-n NAMESPACE] [-N NAME]
python -m uuid [-h] [-u {uuid1,uuid3,uuid4,uuid5,uuid8}] [-n NAMESPACE] [-N NAME]
The following options are accepted:

8
Doc/whatsnew/3.14.rst
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@ -517,6 +517,14 @@ unittest
(Contributed by Jacob Walls in :gh:`80958`.)
uuid
----
* Add support for UUID version 8 via :func:`uuid.uuid8` as specified
in :rfc:`9562`.
(Contributed by Bénédikt Tran in :gh:`89083`.)
.. Add improved modules above alphabetically, not here at the end.
Optimizations

35
Lib/test/test_uuid.py
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@ -8,8 +8,10 @@ import enum
import io
import os
import pickle
import random
import sys
import weakref
from itertools import product
from unittest import mock
py_uuid = import_helper.import_fresh_module('uuid', blocked=['_uuid'])
@ -267,7 +269,7 @@ class BaseTestUUID:
# Version number out of range.
badvalue(lambda: self.uuid.UUID('00'*16, version=0))
badvalue(lambda: self.uuid.UUID('00'*16, version=6))
badvalue(lambda: self.uuid.UUID('00'*16, version=42))
# Integer value out of range.
badvalue(lambda: self.uuid.UUID(int=-1))
@ -681,6 +683,37 @@ class BaseTestUUID:
equal(u, self.uuid.UUID(v))
equal(str(u), v)
def test_uuid8(self):
equal = self.assertEqual
u = self.uuid.uuid8()
equal(u.variant, self.uuid.RFC_4122)
equal(u.version, 8)
for (_, hi, mid, lo) in product(
range(10), # repeat 10 times
[None, 0, random.getrandbits(48)],
[None, 0, random.getrandbits(12)],
[None, 0, random.getrandbits(62)],
):
u = self.uuid.uuid8(hi, mid, lo)
equal(u.variant, self.uuid.RFC_4122)
equal(u.version, 8)
if hi is not None:
equal((u.int >> 80) & 0xffffffffffff, hi)
if mid is not None:
equal((u.int >> 64) & 0xfff, mid)
if lo is not None:
equal(u.int & 0x3fffffffffffffff, lo)
def test_uuid8_uniqueness(self):
# Test that UUIDv8-generated values are unique
# (up to a negligible probability of failure).
u1 = self.uuid.uuid8()
u2 = self.uuid.uuid8()
self.assertNotEqual(u1.int, u2.int)
self.assertEqual(u1.version, u2.version)
@support.requires_fork()
def testIssue8621(self):
# On at least some versions of OSX self.uuid.uuid4 generates

41
Lib/uuid.py
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@ -1,8 +1,8 @@
r"""UUID objects (universally unique identifiers) according to RFC 4122.
r"""UUID objects (universally unique identifiers) according to RFC 4122/9562.
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.
uuid1(), uuid3(), uuid4(), uuid5(), and uuid8() for generating version 1, 3,
4, 5, and 8 UUIDs as specified in RFC 4122/9562.
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
@ -124,12 +124,12 @@ class UUID:
int the UUID as a 128-bit integer
urn the UUID as a URN as specified in RFC 4122
urn the UUID as a URN as specified in RFC 4122/9562
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
version the UUID version number (1 through 8, meaningful only
when the variant is RFC_4122)
is_safe An enum indicating whether the UUID has been generated in
@ -214,9 +214,9 @@ class UUID:
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:
if not 1 <= version <= 8:
raise ValueError('illegal version number')
# Set the variant to RFC 4122.
# Set the variant to RFC 4122/9562.
int &= ~(0xc000 << 48)
int |= 0x8000 << 48
# Set the version number.
@ -355,7 +355,7 @@ class UUID:
@property
def version(self):
# The version bits are only meaningful for RFC 4122 UUIDs.
# The version bits are only meaningful for RFC 4122/9562 UUIDs.
if self.variant == RFC_4122:
return int((self.int >> 76) & 0xf)
@ -719,6 +719,28 @@ def uuid5(namespace, name):
hash = sha1(namespace.bytes + name).digest()
return UUID(bytes=hash[:16], version=5)
def uuid8(a=None, b=None, c=None):
"""Generate a UUID from three custom blocks.
* 'a' is the first 48-bit chunk of the UUID (octets 0-5);
* 'b' is the mid 12-bit chunk (octets 6-7);
* 'c' is the last 62-bit chunk (octets 8-15).
When a value is not specified, a pseudo-random value is generated.
"""
if a is None:
import random
a = random.getrandbits(48)
if b is None:
import random
b = random.getrandbits(12)
if c is None:
import random
c = random.getrandbits(62)
int_uuid_8 = (a & 0xffff_ffff_ffff) << 80
int_uuid_8 |= (b & 0xfff) << 64
int_uuid_8 |= c & 0x3fff_ffff_ffff_ffff
return UUID(int=int_uuid_8, version=8)
def main():
"""Run the uuid command line interface."""
@ -726,7 +748,8 @@ def main():
"uuid1": uuid1,
"uuid3": uuid3,
"uuid4": uuid4,
"uuid5": uuid5
"uuid5": uuid5,
"uuid8": uuid8,
}
uuid_namespace_funcs = ("uuid3", "uuid5")
namespaces = {

2
Misc/NEWS.d/next/Library/2024-08-22-12-12-35.gh-issue-89083.b6zFh0.rst Normal file
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@ -0,0 +1,2 @@
Add :func:`uuid.uuid8` for generating UUIDv8 objects as specified in
:rfc:`9562`. Patch by Bénédikt Tran