【网络通信】上行限速：客户端发包的流量整形

---网关侧的令牌桶限速器
local buckets = {}
function RateLimit.allow(connId, pkgType, cost)
    local key = connId .. ":" .. pkgType
    local b = buckets[key]
    local now = os.clock()
    if not b then
        b = { tokens = 10, last = now }
        buckets[key] = b
    end
    b.tokens = math.min(b.tokens + (now - b.last) * b.rate, b.burst)
    b.last = now
    if b.tokens < cost then
        return false
    end
    b.tokens = b.tokens - cost
    return true
end

---超限连接的分级处置
function RateLimit.onExceed(connId)
    local cnt = (exceedCnt[connId] or 0) + 1
    exceedCnt[connId] = cnt
    if cnt >= 50 then
        QF_KickConn(connId, "异常发包频率")
        QF_RiskAlarm("高频发包踢线", connId)
    elseif cnt >= 10 then
        QF_NotifyGM("发包超限观察", connId)
    end
end