| -- |
| -- 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 |
| |
| |
| _M.set_randomseed = function () |
| math.randomseed(random_seed()) |
| end |
| |
| |
| local newID |
| -- for Nginx Lua |
| local ok, uuid = pcall(require, "resty.jit-uuid") |
| if ok then |
| 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 |
| |
| |
| if _M.is_ngx_lua then |
| _M.encode_base64 = ngx.encode_base64 |
| _M.decode_base64 = ngx.decode_base64 |
| |
| else |
| local Base64 = require('skywalking.dependencies.base64') |
| _M.encode_base64 = Base64.encode |
| _M.decode_base64 = Base64.decode |
| end |
| |
| |
| if _M.is_ngx_lua then |
| local tablepool = require("tablepool") |
| local clear_tab = require("table.clear") |
| local insert_tab = table.insert |
| local ngx = ngx |
| _M.tablepool_fetch = function(name, narr, nrec) |
| narr = narr or 8 |
| nrec = nrec or 8 |
| name = name or "sw_default_tab" |
| |
| local sw_tab_pool = ngx.ctx.sw_tab_pool |
| if not sw_tab_pool then |
| sw_tab_pool = tablepool.fetch("sw_tab_pool", 128, 0) |
| insert_tab(sw_tab_pool, "sw_tab_pool") |
| insert_tab(sw_tab_pool, sw_tab_pool) |
| |
| ngx.ctx.sw_tab_pool = sw_tab_pool |
| end |
| |
| local tab = tablepool.fetch(name, narr, nrec) |
| insert_tab(sw_tab_pool, name) |
| insert_tab(sw_tab_pool, tab) |
| return tab |
| end |
| _M.tablepool_release = function() |
| local sw_tab_pool = ngx.ctx.sw_tab_pool |
| if not sw_tab_pool then |
| return |
| end |
| |
| for i = #sw_tab_pool, 1, -2 do |
| local name = sw_tab_pool[i - 1] |
| local tab = sw_tab_pool[i] |
| tablepool.release(name, tab) |
| -- ngx.log(ngx.INFO, "release name: ", name, " ", tostring(tab)) |
| end |
| clear_tab(sw_tab_pool) |
| |
| ngx.ctx.sw_tab_pool = nil |
| end |
| else |
| _M.tablepool_fetch = function () return {} end |
| _M.tablepool_release = function () return true end |
| end |
| |
| |
| function _M.disable_tablepool() |
| _M.tablepool_fetch = function () return {} end |
| _M.tablepool_release = function () return true end |
| end |
| |
| |
| return _M |