springboot lua检查redis库存的实现示例

--- 字符串分割为数组
local function split(str, char)
    local arr = {};
    local pattern = string.format('([^%s]+)', char);
    for item in string.gmatch(str, pattern) do
        table.insert(arr, item);
    end
    return arr;
end
--- 数组转成map
local function toMap(tb)
    if (tb == nil) then
        return {};
    end
    local map = {};
    for i = 1, #tb do
        if (i % 2 == 1) then
            map[tb[i]] = tb[i+1];
        end
    end
    return map;
end
--- 初始化数据，入参01:1,02:2.01:3
local argArr = {};
for rowItem in string.gmatch(ARGV[1], '([^.]+)') do
    local row = {};
    for keyVal in string.gmatch(rowItem, '([^,]+)') do
    -- 解析出每个key与value
        local tempArr = split(keyVal, ':');
        row[tempArr[1]] = tempArr[2];
    end
    table.insert(argArr, row);
end
--- 检查库存
for i = 1, #KEYS do
    --local rData = redis.call("HMGET", KEYS[i], '01 02');
    local rdsMap = toMap(redis.call("HGETALL", KEYS[i]));
    for tier, quantity in pairs(argArr[i]) do
        --redis.log(redis.LOG_NOTICE, string.format('key is:%s,tier is:%s,quantity is:%s', KEYS[i], tier, quantity));
        if (rdsMap[tier] == nil or tonumber(quantity) > tonumber(rdsMap[tier])) then
            return string.format("库存key:%s,tier:%s不足", KEYS[i], tier);
        end
    end
end
return '';

@Autowired
private StringRedisTemplate redisJsonTemplate;

@Test
public void checkInventory() {
    List<String> keyList = List.of("stock:GZ7:433680411156197407", "stock:GZ7:433680411156197408");
    // 执行 lua 脚本
    DefaultRedisScript<String> redisScript = new DefaultRedisScript<>();
    // 指定 lua 脚本
    redisScript.setScriptSource(new ResourceScriptSource(new ClassPathResource("/lua/TheaterStockCheck.lua")));
    // 指定返回类型
    redisScript.setResultType(String.class);
    Object result = redisJsonTemplate.execute(redisScript, keyList, "01:1,0101:2.01:3");
    //01:1,02:2.01:3
    System.out.println(result);
}