utils.lua

local modulename = "abtestingUtils"
local _M = {}
_M._VERSION = '0.0.1'

local cjson = require('cjson.safe')
--将doresp和dolog，与handler统一起来。handler将返回一个table，结构为：
--[[
handler———errinfo————errcode————code
    |           |               |
    |           |               |————info
    |           |
    |           |————errdesc
    |
    |
    |
    |———errstack				 
]]--		
_M.dolog = function(info, desc, data, errstack)
    local errlog = ''
    local code, err = info[1], info[2]
    local errcode = code
    local errinfo = desc and err..desc or err 
    
    errlog = errlog .. ' errcode : '..errcode
    errlog = errlog .. ', errinfo : '..errinfo
    if data then
        errlog = errlog .. ', extrainfo : '..data
    end
    if errstack then
        errlog = errlog .. ', errstack : '..errstack
    end
    ngx.log(ngx.ERR, errlog)
end

_M.doresp = function(info, desc, data)
    local response = {}
    
    local code = info[1]
    local err  = info[2]
    response.errcode = code
    response.errinfo = desc and err..desc or err 
    if data then 
        response.data = data 
    end
    
    return cjson.encode(response)
end

return _M