Golang redis example for targeting

target.lua

local m = redis.call("ZREVRANGE", ARGV[1], "0", "0", "WITHSCORES");
if m ~= nil and m[2] ~= nil then
  local max_priority = m[2]
  local a = redis.call("ZRANGEBYSCORE", ARGV[1], max_priority, max_priority);
  if a ~= nil and #a > 0 then
    math.randomseed(ARGV[2])
    local ad_id = math.random(#a)
    return redis.call("HGET", "ad:" .. a[ad_id] .. ":attrs", "ad_response");
  end
end
return nil