【工具链】pcall错误上抛边界：错误处理的分层与吞错防范

local ERRMSG = { no_gold = "金币不足", bag_full = "背包空间不足", cooldown = "操作过于频繁" }
local function safeEntry(actor, bizFn)
    local player = class(actor)
    local ok, err = pcall(bizFn, actor)
    if not ok then
        local code = tostring(err):match("ERR_(%w+)")
        if code ~= nil and ERRMSG[code] ~= nil then
            sendmsg(actor, 0, ERRMSG[code])
        else
            sendmsg(actor, 0, "操作异常，请联系客服")
        end
        setsysvarex("ERR_LOG", os.date("%H%M%S") .. "|" .. tostring(err), 1)
    end
    return ok
end

local function doTradeBiz(actor, amount)
    local player = class(actor)
    if player:checkitemw("金币", amount) == false then
        error("ERR_no_gold", 0)
    end
    player:takeitem("金币", amount)
    giveitem(actor, "交易凭证", 1)
end