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util.uuid: Use util.hex and util.random

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This commit is contained in:
Matthew Wild 2014-09-02 17:58:12 +01:00
parent 2716c4191d
commit a540fdb9f4
1 changed files with 13 additions and 31 deletions
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44
util/uuid.lua
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@ -6,45 +6,27 @@
-- COPYING file in the source package for more information.
--
local random = require "util.random";
local random_bytes = random.bytes;
local hex = require "util.hex".to;
local m_ceil = math.ceil;
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;
return hex(random_bytes(m_ceil(n/2))):sub(1, n);
end
local function get_twobits()
return ("%x"):format(get_nibbles(1):byte() % 4 + 8);
end
function generate()
local 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;
return {
get_nibbles=get_nibbles;
generate = generate ;
-- COMPAT
seed = random.seed;
};