php一份代码分层规范

public function createOrder(Request $request)
    {
        DB::beginTransaction();
        try {
            $this->orderService->validatorCreateOrder($request);
            $goods = $this->orderService->validatorGoods($request);
            // 设置商品
            $this->orderProcessService->setGoods($goods);
            // 优惠码
            $coupon = $this->orderService->validatorCoupon($request);
            // 设置优惠码
            $this->orderProcessService->setCoupon($coupon);
            $otherIpt = $this->orderService->validatorChargeInput($goods, $request);
            $this->orderProcessService->setOtherIpt($otherIpt);
            // 数量
            $this->orderProcessService->setBuyAmount($request->input('by_amount'));
            // 支付方式
            $this->orderProcessService->setPayID($request->input('payway'));
            // 下单邮箱
            $this->orderProcessService->setEmail($request->input('email'));
            // ip地址
            $this->orderProcessService->setBuyIP($request->getClientIp());
            // 查询密码
            $this->orderProcessService->setSearchPwd($request->input('search_pwd', ''));
            // 创建订单
            $order = $this->orderProcessService->createOrder();
            DB::commit();
            // 设置订单cookie
            $this->queueCookie($order->order_sn);
            return redirect(url('/bill', ['orderSN' => $order->order_sn]));
        } catch (RuleValidationException $exception) {
            DB::rollBack();
            return $this->err($exception->getMessage());
        }
    }

    public function validatorCoupon(Request $request):? Coupon
    {
        // 如果提交了优惠码
        if ($request->filled('coupon_code')) {
            // 查询优惠码是否存在
            $coupon = $this->couponService->withHasGoods($request->input('coupon_code'), $request->input('gid'));
            // 此商品没有这个优惠码
            if (empty($coupon)) {
                throw new RuleValidationException(__('dujiaoka.prompt.coupon_does_not_exist'));
            }
            // 剩余次数不足
            if ($coupon->ret <= 0) {
                throw new RuleValidationException(__('dujiaoka.prompt.coupon_lack_of_available_opportunities'));
            }
            return $coupon;
        }
        return null;
    }

    public function withGoodsByAmountAndStatusUnsold(int $goodsID, int $byAmount)
    {
        $carmis = Carmis::query()
            ->where('goods_id', $goodsID)
            ->where('status', Carmis::STATUS_UNSOLD)
            ->take($byAmount)
            ->get();
        return $carmis ? $carmis->toArray() : null;
    }

            // ip地址
            $this->orderProcessService->setBuyIP($request->getClientIp());
            // 查询密码
            $this->orderProcessService->setSearchPwd($request->input('search_pwd', ''));
            // 创建订单
            $order = $this->orderProcessService->createOrder();