Question

我在负载均衡器后面有两台服务器。如果在一台服务器上运行PUT或POST事务，则另一台服务器将无法查询最新数据，即

请求1：将车辆名称（ID为2）从Car 001更改为Car 101。

请求2：获取id 2的车辆名称，它将显示Car 001直到几分钟，然后它将变为Car 101。

我的文件夹结构如下：

-API
- 助手
- 模型
--- init.py
--- vehicle.py
- 资源
--- init.py
--- vehicles.py

以下是模型中init.py的代码：

from flask import Flask

from flask_sqlalchemy import SQLAlchemy
from flask_marshmallow import Marshmallow

app = Flask(__name__)

app.config['SQLALCHEMY_DATABASE_URI'] = "url"
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['SQLALCHEMY_POOL_RECYCLE'] = 5 
app.config['SQLALCHEMY_POOL_SIZE'] = 10

db = SQLAlchemy(app)
ma = Marshmallow(app)

这是车型：

import arrow, json, uuid
import jwt
from datetime import datetime
import datetime as dt
from functools import wraps


from api.models import db, ma

from api.titan.v1.models.vehicle_state import VehicleState


class Vehicle(db.Model):
    id = db.Column(db.Integer(), primary_key=True)
    name = db.Column(db.String(300), index=True)
    createdAt = db.Column(db.DateTime)
    plateNumber = db.Column(db.String(300))

这是车辆请求处理：

import arrow, json, uuid, pytz
import requests
from datetime import datetime

from flask_restful import reqparse, abort, Api, Resource
from werkzeug.exceptions import BadRequest
from flask import request, jsonify

from api.models import db


class Vehicles(Resource):

    def get(self, vehicle_id=None):

        response_object = {
            'object': 'vehicle',
            'verb': 'GET',
            'timestamp': arrow.utcnow().timestamp
        }

       if vehicle_id is None:
            vehicles = db.session.query(Vehicle).filter_by(companyId=user['companyId']).all()
            response_object['data'] = [schema.dump(i).data for i in vehicles]  

        else:
            vehicle = db.session.query(Vehicle).filter_by(id=vehicle_id, companyId=user['companyId']).first()
            response_object['data'] = schema.dump(vehicle).data


        return response_object, 200


    def put(self, vehicle_id):


        data = request.get_json()

        response_object = {
            'object': 'vehicle',
            'verb': 'PUT',
            'timestamp': arrow.utcnow().timestamp,
        }

        vehicle = db.session.query(Vehicle).filter_by(id=vehicle_id).first()
        vehicle.name = data['name']
        db.session.commit()

        response_object['data'] = vehicle


        return response_object, 200

为Flask-Sqlalchemy的每个请求创建新会话

0 个答案: