local rateLimit ={}
function rateLimit.limit_flow(limit_key,max_limit,seconds)
  if not limit_key or not max_limit then
    return true
  end
    
  local redises=lua_context["redises"]
  local redis_util=redises[math.random(#redises)] 
  local redis=redis_util:getConnect()
  if not redis then
     return true
  end
  local limit=0

  if seconds then
    limit=redis:eval("local current;current=redis.call('incr',KEYS[1]);if tonumber(current) == 1 then redis.call('expire',KEYS[1],KEYS[2]) end return current",2,limit_key,seconds)
  else
    limit=redis:eval("local current;current=redis.call('incr',KEYS[1]);if tonumber(current) == 1 then redis.call('expire',KEYS[1],2) end return current",1,limit_key)
  end
  
  redis_util:close(redis)
  if limit then
    if tonumber(limit)>max_limit then
      return false
    else
      return true
    end
  end
  return true
end

return rateLimit