https://github.com/python/cpython/commit/03924b5deeb766fabd53ced28ba707e4dd08fb60 commit: 03924b5deeb766fabd53ced28ba707e4dd08fb60 branch: main author: Bénédikt Tran <[email protected]> committer: vstinner <[email protected]> date: 2024-11-12T19:08:49+01:00 summary:
gh-89083: add support for UUID version 8 (RFC 9562) (#123224) Co-authored-by: Hugo van Kemenade <[email protected]> files: A Misc/NEWS.d/next/Library/2024-08-22-12-12-35.gh-issue-89083.b6zFh0.rst M Doc/library/uuid.rst M Doc/whatsnew/3.14.rst M Lib/test/test_uuid.py M Lib/uuid.py diff --git a/Doc/library/uuid.rst b/Doc/library/uuid.rst index 0f2d7820cb25c8..6166c22caedf81 100644 --- a/Doc/library/uuid.rst +++ b/Doc/library/uuid.rst @@ -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 <[email protected]> .. sectionauthor:: George Yoshida <[email protected]> @@ -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: diff --git a/Doc/whatsnew/3.14.rst b/Doc/whatsnew/3.14.rst index 20bd3aa5221454..c2cf46902fd7fe 100644 --- a/Doc/whatsnew/3.14.rst +++ b/Doc/whatsnew/3.14.rst @@ -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 diff --git a/Lib/test/test_uuid.py b/Lib/test/test_uuid.py index e177464c00f7a6..7bd26a8ca34b62 100755 --- a/Lib/test/test_uuid.py +++ b/Lib/test/test_uuid.py @@ -8,8 +8,10 @@ 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 @@ def test_exceptions(self): # 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 @@ def test_uuid5(self): 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 diff --git a/Lib/uuid.py b/Lib/uuid.py index 4d4f06cfc9ebbe..9c6ad9643cf6d5 100644 --- a/Lib/uuid.py +++ b/Lib/uuid.py @@ -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 @@ def __init__(self, hex=None, bytes=None, bytes_le=None, fields=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: + 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 @@ def variant(self): @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 = { diff --git a/Misc/NEWS.d/next/Library/2024-08-22-12-12-35.gh-issue-89083.b6zFh0.rst b/Misc/NEWS.d/next/Library/2024-08-22-12-12-35.gh-issue-89083.b6zFh0.rst new file mode 100644 index 00000000000000..d37d585d51b490 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2024-08-22-12-12-35.gh-issue-89083.b6zFh0.rst @@ -0,0 +1,2 @@ +Add :func:`uuid.uuid8` for generating UUIDv8 objects as specified in +:rfc:`9562`. Patch by Bénédikt Tran _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3/lists/python-checkins.python.org/ Member address: [email protected]
