Lua snippet for wrk to skip caches by adding a querystring

cache-killer.lua

-- Lua snippet to use with wrk to test (stress / benchmark) urls skipping CDN / Framework / misc
-- cache by adding a 'random' querystring
--
-- To use it adjust wrk params and do something like this:
-- docker run --rm -v $(pwd)/cache-killer.lua:/cache-killer.lua  skandyla/wrk -c 1 -d 1 -t 1 --script /cache-killer.lua  http://www.yoursite/testpath

request = function()
   path = wrk.path
   if path.find(path, "?") then
      path = path .. "&" 
   else
      path =  path .. "?" 
   end

   killer = tostring(math.random())
   time = tostring(os.time())
   path = path .. "cache-killer=" .. killer .. "&" .. time

   return wrk.format(nil, path)
end