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annotate util/uuid.lua @ 7051:ecfa474ff570

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tests/test.lua: Fix fake module() function to prevent _M from being _G (test.lua's environment), which caused modules to break the sandbox when they set _M.*
author Matthew Wild <mwild1@gmail.com>
date Wed, 06 Jan 2016 00:24:06 +0000
parents 001b3cff4ed8
children 990b4ddaf582 c633e1338554
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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
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10 local tostring = tostring;
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11 local os_time = os.time;
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12 local os_clock = os.clock;
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13 local sha1 = require "util.hashes".sha1;
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14
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15 module "uuid"
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16
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17 local last_uniq_time = 0;
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18 local function uniq_time()
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19 local new_uniq_time = os_time();
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20 if last_uniq_time >= new_uniq_time then new_uniq_time = last_uniq_time + 1; end
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21 last_uniq_time = new_uniq_time;
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22 return new_uniq_time;
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23 end
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24
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25 local function new_random(x)
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26 return sha1(x..os_clock()..tostring({}), true);
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27 end
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28
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29 local buffer = new_random(uniq_time());
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30 local function _seed(x)
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31 buffer = new_random(buffer..x);
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32 end
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33 local function get_nibbles(n)
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34 if #buffer < n then _seed(uniq_time()); end
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35 local r = buffer:sub(0, n);
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36 buffer = buffer:sub(n+1);
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37 return r;
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38 end
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39 local function get_twobits()
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40 return ("%x"):format(get_nibbles(1):byte() % 4 + 8);
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41 end
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42
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43 function generate()
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44 -- generate RFC 4122 complaint UUIDs (version 4 - random)
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45 return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
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46 end
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47 seed = _seed;
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48
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49 return _M;