| -- |
| -- 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()) |
| |
| function _M.newID() |
| return {timestamp(), math.random(0, MAX_ID_PART2), math.random(0, MAX_ID_PART3)} |
| end |
| |
| -- Format a trace/segment id into an array. |
| -- An official ID should have three parts separated by '.' and each part of it is a number |
| function _M.formatID(str) |
| local regex = '.' |
| if _M.is_ngx_lua then |
| regex = [[\.]] |
| end |
| local parts = split(str, regex) |
| if #parts ~= 3 then |
| return nil |
| end |
| |
| return parts |
| end |
| |
| -- @param id is an array with length = 3 |
| function _M.id2String(id) |
| return id[1] .. '.' .. id[2] .. '.' .. id[3] |
| end |
| |
| return _M |