参考： - https://redis-py.readthedocs.io/en/stable/lua_scripting.html - https://onecompiler.com/questions/3x6yguydg/how-to-encode-decode-json-objects-in-redis-lua-script

1. lua 解析 JSON

import redis

def parse_json():
    r = redis.Redis()

    lua = """
    local value = redis.call('GET', KEYS[1])
    local json = cjson.decode(tostring(value))

    -- work with json
    json.foo = 1
    json.date = redis.call('TIME') --os.data("%Y-%m-%d %H:%M:%S") # 获取当前时间

    local output = cjson.encode(json);
    return output
    """
    multiply = r.register_script(lua) # 注册 lua 代码，如果 lua 代码有语法错误，会注册失败
    r.set('foo', '{}')
    v = multiply(keys=['foo'], args=[]) # 调用 lua 代码
    print(v)

2. lua 遍历 JSON

来源：https://juejin.cn/s/lua%20%E9%81%8D%E5%8E%86json

pairs 遍历键、值

for key, value in pairs(json) do
    print(key, value)
end

ipairs 遍历索引、值

for index, value in ipairs(json) do
    print(index, value)
end