prosody
2170e2c0d57a
util/uuid.lua

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util/uuid.lua @ 1303:2170e2c0d57a

util.uuid: Now generates RFC 4122 complaint UUIDs (version 4 - random)
author Waqas Hussain <waqas20@gmail.com>
date Thu, 04 Jun 2009 18:04:26 +0500
parent 1302:4561c6d95339
child 1304:0a49759464e0
comparison
equal deleted inserted replaced
1302:4561c6d95339 1303:2170e2c0d57a
25 25
26 local function new_random(x) 26 local function new_random(x)
27 return sha1(x..os_clock()..tostring({}), true); 27 return sha1(x..os_clock()..tostring({}), true);
28 end 28 end
29 29
30 local buffer = new_random(uniq_time());
31 local function get_nibbles(n)
32 if #buffer < n then
33 buffer = new_random(buffer..uniq_time());
34 end
35 local r = buffer:sub(0, n);
36 buffer = buffer:sub(n+1);
37 return r;
38 end
39 local function get_twobits()
40 return ("%x"):format(get_nibbles(1):byte() % 4 + 8);
41 end
42
30 function generate() 43 function generate()
31 return new_random(uniq_time()); 44 -- generate RFC 4122 complaint UUIDs (version 4 - random)
45 return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
32 end 46 end
33 47
34 return _M; 48 return _M;