【高级技巧】错误分层：业务错误与系统错误的分界设计

local ERR = { NO_MATERIAL = 1001, COOLDOWN = 1002, SYSTEM = 5001 }
local function composeBadge(actor)
    actor = getplayerbyname(actor)
    if not takeitem(actor, "青铜徽章", 3) then
        error({ code = ERR.NO_MATERIAL, msg = "青铜徽章不足 3 枚" }, 0)
    end
    local ok, err = pcall(function()
        error({ code = ERR.SYSTEM, msg = "结算接口异常" }, 0)
    end)
    if not ok then
        local e = err
        if type(e) == "table" and e.code >= 5000 then
            print("[SYS-ERR] " .. tostring(e.msg))
        end
    end
end

local function tryCompose(actor)
    actor = getplayerbyname(actor)
    local ok, e = pcall(composeBadge, actor)
    if ok then
        return
    end
    if type(e) == "table" and e.code < 5000 then
        sendmsg(actor, 1, e.msg)
    else
        sendmsg(actor, 1, "功能异常，请稍后再试。")
        logError(tostring(e))
    end
end