from datetime import datetime
from pro_celery.celery import del_order
def pay_status(order_id,check_time=5):  # 5秒后
    ctime  = datetime.now()
    utc_ctime = datetime.utcfromtimestamp(ctime.timestamp())
    from  datetime import timedelta
    #seconds參數(shù)表示多少秒后執(zhí)行
    time_delay = timedelta(seconds=check_time)
    time_task = utc_ctime+ time_delay
    #提交任務(wù)給del_order,讓他多久后執(zhí)行
    res = del_order.apply_async(args = [order_id,],eta= time_task)

# 一定要判斷pay_status，防止途中完成支付
        row = models.Order.objects.filter(order_id = order_id,pay_status=0).update(status = "dead")
        if row:
            transaction.savepoint_commit(sid)
        else:
            transaction.savepoint_rollback(sid)

import celery
import time
backend = "redis://127.0.0.1:6379/1"
broker = "redis://127.0.0.1:6379/2"
cel = celery.Celery("test",backend=backend,broker = broker)
import os,sys
import django
BASE_DIR = os.path.dirname(os.path.dirname(__file__)) #定位到你django的根目錄
sys.path.append(os.path.abspath(BASE_DIR))
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "shopapi.settings")
django.setup()
from django.db import transaction
@cel.task
@transaction.atomic
def del_order(order_id):
    #要通過數(shù)據(jù)庫來查當(dāng)前order_id的訂單狀態(tài)，如果沒有支付，我們要操作庫存，并且取消訂單
    from  app01 import models
    # 查詢訂單
    data = models.Order.objects.filter(order_id = order_id,pay_status=0).first()
    #如果data沒有，表示以及支付成功，無需操作，反之要回滾庫存
    if data:
        # 回滾哪些商品的庫存，回滾多少？從哪里知道order_item中看
        item_data = models.Order_items.objects.filter(order_id =order_id).values("product","nums")
        # item_data-->[{'product':1,'nums":2},{product':2,'nums":1}]
        all_product_dict = {k["product"] :k["nums"]  for k in item_data}
        #{1:2,2:2}
        all_product_id = list(all_product_dict.keys())
        all_product = models.Product.objects.filter(product_id__in = all_product_id)
        #開啟事務(wù)
        sid = transaction.savepoint()
        for product in all_product:
            for i in range(3):
                stock = product.stock.quantity
                new_stock = stock + all_product_dict[product.product_id]
                #用了樂觀鎖
                res = models.Stock.objects.filter(quantity=stock,stock_id=product.stock.stock_id).update(quantity=new_stock)
                if not res:
                    if i==2:
                        transaction.savepoint_rollback(sid)
                        from app01.func import function_tool
                        function_tool.pay_status(order_id,1)
                        return
                    else:
                        continue
                else:
                    break
            new_buy_cont = product.buy_count-all_product_dict[product.product_id]
            models.Product.objects.filter(product_id = product.product_id).update(buy_count = new_buy_cont)
        # 一定要判斷pay_status，防止途中完成支付
        row = models.Order.objects.filter(order_id = order_id,pay_status=0).update(status = "dead")
        if row:
            transaction.savepoint_commit(sid)
        else:
            transaction.savepoint_rollback(sid)