prosody
4561c6d95339
util/uuid.lua

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util/uuid.lua @ 1302:4561c6d95339

util.uuid: More uniqueness!
author Waqas Hussain <waqas20@gmail.com>
date Thu, 04 Jun 2009 17:41:55 +0500
parent 896:2c0b9e3c11c3
child 1303:2170e2c0d57a
comparison
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1301:d10d84f755b5 1302:4561c6d95339
5 -- This project is MIT/X11 licensed. Please see the 5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information. 6 -- COPYING file in the source package for more information.
7 -- 7 --
8 8
9 9
10
11 local m_random = math.random; 10 local m_random = math.random;
12 local tostring = tostring; 11 local tostring = tostring;
12 local os_time = os.time;
13 local os_clock = os.clock;
14 local sha1 = require "util.hashes".sha1;
15
13 module "uuid" 16 module "uuid"
14 17
18 local last_uniq_time = 0;
19 local function uniq_time()
20 local new_uniq_time = os_time();
21 if last_uniq_time >= new_uniq_time then new_uniq_time = last_uniq_time + 1; end
22 last_uniq_time = new_uniq_time;
23 return new_uniq_time;
24 end
25
26 local function new_random(x)
27 return sha1(x..os_clock()..tostring({}), true);
28 end
29
15 function generate() 30 function generate()
16 return tostring(m_random(0, 99999999)); 31 return new_random(uniq_time());
17 end 32 end
18 33
19 return _M; 34 return _M;