【Lua实战】元表保护：只读配置表的写入拦截

-- 元表保护：写入拦截
local function protect(t, name)
    for k, v in pairs(t) do
        if type(v) == "table" then
            t[k] = protect(v, name .. "." .. tostring(k))
        end
    end
    local proxy = setmetatable({}, {
        __index = t,
        __newindex = function(_, k)
            error("只读表禁止写入: " .. name .. "." .. tostring(k), 2)
        end,
    })
    return proxy
end
local DropCfg = protect({zuma = {rate = 150}}, "DropCfg")

-- 热更修改：解保护与重锁
local player = class(actor)
local function hotUpdate(t, newData, name)
    setmetatable(t, nil)
    for k in pairs(t) do t[k] = nil end
    for k, v in pairs(newData) do t[k] = v end
    protect(t, name)
    sendmsg(player, 1, 0, "配置 " .. name .. " 已热更并重新上锁。")
end
local ok, err = pcall(function() DropCfg.zuma.rate = 999 end)
if not ok then
    hotUpdate(DropCfg, {zuma = {rate = 999}}, "DropCfg")
end