class GoodServer(Server):
def __init__(self):
self.dbser = CoreDBServer(GoodTable)
super().__init__()
def app_goods_list(self, page, page_size, sorts_by, *args, **kwargs):
offset, limit = page, page_size
if offset >= 1:
offset = (offset - 1) * limit
else:
limit = 0
wheres = [
['inventory', 'gt', '0'],
]
rows = self.dbser.select(wheres, sorts_by, offset, limit).fetchall()
return {'code': 0, "list": [self.dbser.row2json(row) for row in rows]}
def good_detail(self, id):
try:
wheres = [['id', 'eq', id]]
row = self.dbser.select(wheres).first()
if not row:
return self.error_tips('商品不存在')
else:
return {'code': 0, "good": self.dbser.row2json(row)}
except Exception as e:
logging.error(e)
return UNKNOW_ERROR
def release_inventory(self, ids: list):
"""rlease inventory when order exp。"""
good_id_str = ','.join([str(good_id) for good_id in ids])
sql = """update %s set inventory = inventory+1 where id in (%s); """ % (
self.dbser.table.name, good_id_str)
return self.dbser.sql_transaction_execute(sql=sql)
def sub_inventory(self, ids: list) -> dict:
"""sub inventory when order add. """
good_id_str = ','.join([str(good_id) for good_id in ids])
sql = """update %s set inventory = inventory-1 where id in (%s) and inventory >0 ; """ % (
self.dbser.table.name, good_id_str)
conn = self.dbser.connect()
with conn.begin() as tran:
if len(ids) == conn.execute(sql).rowcount:
tran.commit()
return {'code': 0}
else:
tran.rollback()
return {'code': 1, 'msg': '库存不足'}
class OrderServer(Server):
def __init__(self):
self.dbser = CoreDBServer(OrderTable)
super().__init__()
def add_order(self, username: str, good_ids: list) -> dict:
"""return order detail or fail reason. """
try:
# 减库存
ret = GoodServer().sub_inventory(good_ids)
if 1 == ret['code']:
return ret
# 下单号 日期(精确到分) + 4位随机数，实际上要避免这种有明显规律的单号
order_no = datetime.datetime.utcnow().strftime(
'%Y%m%d%H%M')+str(random.randint(0, 9999)).zfill(4)
good_id_str = ','.join([str(good_id) for good_id in good_ids])
sql = "select price from %s where id in (%s);" % (
GoodTable.name, good_id_str)
rows = self.dbser.sql_execute(sql).fetchall()
sum_price = sum([row[0] for row in rows])
values = {"username": username, "order_no": order_no,
'good_ids': good_id_str, "sum_price": sum_price}
self.dbser.insert(**values)
return {'code': 0, 'order_no': order_no}
except Exception as e:
logging.error(e)
return UNKNOW_ERROR
def order_detail(self, username, order_no):
wheres = [
["username", 'eq', username],
["order_no", 'eq', order_no]
]
row = self.dbser.select(wheres).first()
if row:
order = self.dbser.row2json(row)
# 15分钟过期
end_time = copy.deepcopy(row['create_time'])
end_time += datetime.timedelta(seconds=900)
# 过期订单更新状态
if datetime.datetime.now() > end_time and order['status'] not in (1, 3):
order['status'] = 3
GoodServer().release_inventory(order['good_ids'].split(','))
print(self.dbser.update(wheres, status=3).rowcount)
elif order['status'] in [0, 2]:
order['exp_time'] = (
end_time-datetime.datetime.utcnow()).total_seconds()
return {"code": 0, "order": order}
else:
return self.error_tips('订单不存在')
def order_list(self, username, page, page_size):
offset_num = (page-1) * page_size
wheres = [
['username', 'eq', username]
]
sorts_by = [
['create_time', '1']
]
l = self.dbser.select(
wheres, sorts_by, offset=offset_num, limit=page_size).fetchall()
l = [self.dbser.row2json(i) for i in l]
return {'code': 0, 'list': l}