wrk 动态参数

local charset = {}  do -- [0-9a-zA-Z]
  for c = 48, 57  do table.insert(charset, string.char(c)) end
  for c = 65, 90  do table.insert(charset, string.char(c)) end
  for c = 97, 122 do table.insert(charset, string.char(c)) end
end

local function randomString(length)
  if not length or length <= 0 then return '' end
  math.randomseed(os.clock()^5)
  return randomString(length - 1) .. charset[math.random(1, #charset)]
end


wrk.method = "POST"
wrk.headers["Content-Type"] = "application/json"

request = function()
  local username = randomString(8)
  return wrk.format(nil,nil, nil, '{"service": "'..username..'"}')
end