| -- |
| -- 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 Util = {} |
| local MAX_ID_PART2 = 1000000000 |
| local MAX_ID_PART3 = 100000 |
| local SEQ = 1 |
| |
| function Util:newID() |
| SEQ = SEQ + 1 |
| return {Util.timestamp(), math.random( 0, MAX_ID_PART2), math.random( 0, MAX_ID_PART3) + SEQ} |
| 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 Util:formatID(str) |
| local parts = Util:split(str, '.') |
| if #parts ~= 3 then |
| return nil |
| end |
| |
| parts[1] = tonumber(parts[1]) |
| parts[2] = tonumber(parts[2]) |
| parts[3] = tonumber(parts[3]) |
| |
| return parts |
| end |
| |
| -- @param id is an array with length = 3 |
| function Util:id2String(id) |
| return id[1] .. '.' .. id[2] .. '.' .. id[3] |
| end |
| |
| -- A simulation implementation of Java's System.currentTimeMillis() by following the SkyWalking protocol. |
| -- Return the difference as string, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC. |
| -- But in using os.clock(), I am not sure whether it is accurate enough. |
| function Util:timestamp() |
| local a,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 |
| |
| -- Split the given string by the delimiter. The delimiter should be a literal string, such as '.', '-' |
| function Util:split(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 |
| |
| |
| return Util |