Software /
code /
prosody
File
util/uuid.lua @ 4093:36555949bd16
util.datamanager: Use prosody.paths.data as the initial value for data_path
author | Matthew Wild <mwild1@gmail.com> |
---|---|
date | Fri, 07 Jan 2011 11:55:19 +0000 (2011-01-07) |
parent | 2957:805b067cd13e |
child | 5776:bd0ff8ae98a8 |
child | 7010:001b3cff4ed8 |
line wrap: on
line source
-- Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local m_random = math.random; local tostring = tostring; local os_time = os.time; local os_clock = os.clock; local sha1 = require "util.hashes".sha1; module "uuid" local last_uniq_time = 0; local function uniq_time() local new_uniq_time = os_time(); if last_uniq_time >= new_uniq_time then new_uniq_time = last_uniq_time + 1; end last_uniq_time = new_uniq_time; return new_uniq_time; end local function new_random(x) return sha1(x..os_clock()..tostring({}), true); end local buffer = new_random(uniq_time()); local function _seed(x) buffer = new_random(buffer..x); end local function get_nibbles(n) if #buffer < n then _seed(uniq_time()); end local r = buffer:sub(0, n); buffer = buffer:sub(n+1); return r; end local function get_twobits() return ("%x"):format(get_nibbles(1):byte() % 4 + 8); end function generate() -- generate RFC 4122 complaint UUIDs (version 4 - random) return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12); end seed = _seed; return _M;