prosody
49ecfb070240
util/uuid.lua

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util/uuid.lua @ 13330:49ecfb070240

util.async: Export a table of currently-waiting runners This can be used for debugging and introspection.
author Matthew Wild <mwild1@gmail.com>
date Tue, 21 Nov 2023 18:11:40 +0000
parent 13317:e6a5f196fc1f
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local random = require "prosody.util.random";
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10 local random_bytes = random.bytes;
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11 local time = require "prosody.util.time";
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12 local hex = require "prosody.util.hex".encode;
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13 local m_ceil = math.ceil;
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14 local m_floor = math.floor;
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16 local function get_nibbles(n)
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17 return hex(random_bytes(m_ceil(n/2))):sub(1, n);
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18 end
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19
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20 local function get_twobits()
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21 return ("%x"):format(random_bytes(1):byte() % 4 + 8);
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22 end
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23
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24 local function generate()
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25 -- generate RFC 4122 complaint UUIDs (version 4 - random)
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26 return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
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27 end
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28
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29 local function generate_v7()
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30 -- Sortable based on time and random
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31 -- https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-01#section-4.4
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32 local t = time.now();
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33 local unixts = m_floor(t);
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34 local unixts_a = m_floor(unixts / 16);
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35 local unixts_b = m_floor(unixts % 16);
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36 local subsec = t % 1;
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37 local subsec_a = m_floor(subsec * 0x1000);
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38 local subsec_b = m_floor(subsec * 0x1000000) % 0x1000;
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39 return ("%08x-%x%03x-7%03x-%4s-%12s"):format(unixts_a, unixts_b, subsec_a, subsec_b, get_twobits() .. get_nibbles(3), get_nibbles(12));
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40 end
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41
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42 return {
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43 v4 = generate;
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44 v7 = generate_v7;
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45 get_nibbles=get_nibbles;
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46 generate = generate ;
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47 -- COMPAT
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48 seed = random.seed;
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49 };