blob: fe0548c847681318f1d05b2f510adc9487afc740 [file] [log] [blame]
--
-- Licensed to the Apache Software Foundation (ASF) under one or more
-- contributor license agreements. See the NOTICE file distributed with
-- this work for additional information regarding copyright ownership.
-- The ASF licenses this file to You under the Apache License, Version 2.0
-- (the "License"); you may not use this file except in compliance with
-- the License. You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
local _M = {}
-- for pure Lua
local split = function(str, delimiter)
local t = {}
for substr in string.gmatch(str, "[^".. delimiter.. "]*") do
if substr ~= nil and string.len(substr) > 0 then
table.insert(t,substr)
end
end
return t
end
local timestamp = function()
local _, b = math.modf(os.clock())
if b==0 then
b='000'
else
b=tostring(b):sub(3,5)
end
return os.time() * 1000 + b
end
-- for Nginx Lua
local ok, ngx_re = pcall(require, "ngx.re")
if ok then
split = ngx_re.split
timestamp = function()
return ngx.now() * 1000
end
end
_M.split = split
_M.timestamp = timestamp
_M.is_ngx_lua = ok
local MAX_ID_PART2 = 1000000000
local MAX_ID_PART3 = 100000
local random_seed = function ()
local seed
local frandom = io.open("/dev/urandom", "rb")
if frandom then
local str = frandom:read(4)
frandom:close()
if str then
local s = 0
for i = 1, 4 do
s = 256 * s + str:byte(i)
end
seed = s
end
end
if not seed then
if _M.is_ngx_lua then
seed = ngx.now() * 1000 + ngx.worker.pid()
else
seed = os.clock()
end
end
return seed
end
math.randomseed(random_seed())
local newID
-- for Nginx Lua
local ok, uuid = pcall(require, "resty.jit-uuid")
if ok then
uuid.seed()
newID = function()
return uuid.generate_v4()
end
else
newID = function()
return timestamp() .. '.' .. math.random(0, MAX_ID_PART2) .. '.'
.. math.random(0, MAX_ID_PART3)
end
end
_M.newID = newID
return _M