【Lua实战】xpcall 的错误对象：带上下文的错误传递

---触发器的安全包裹：错误带上下文
local function wrapTrigger(fn, name)
    return function(actor, ...)
        local ok, err = xpcall(fn, function(e)
            return {
                msg = tostring(e),
                trigger = name,
                who = type(actor) == "userdata"
                    and (actor:GetName() or "?") or "?",
                map = type(actor) == "userdata"
                    and tostring(actor.mapId) or "?",
                trace = debug.traceback(e, 2),
            }
        end, actor, ...)
        if not ok then
            ErrReport.push(err)
            sendmsg(actor, 1, "操作异常，已记录反馈")
        end
        return ok
    end
end

attack = wrapTrigger(attack, "attack")
beginmagic = wrapTrigger(beginmagic, "beginmagic")

---错误报告：按触发器聚合计数
ErrReport.buckets = {}
function ErrReport.push(err)
    local key = err.trigger .. "|" ..
        (err.msg:match("^[^:]+") or "?")
    local b = ErrReport.buckets[key]
    if not b then
        b = { count = 0, first = err }
        ErrReport.buckets[key] = b
    end
    b.count = b.count + 1
    if b.count == 50 then
        Ops.alert("触发器高频报错: " .. key, err.first)
    end
end