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对于会话
会话是指服务器以浏览器维度提供的上下文缓存。服务器通过在 cookie 或者 url 中保护惟一 id 来索引和治理会话缓存。会话缓存是跨服务器多个利用节点共享的，利用节点通过会话模块有序拜访会话缓存：
缓存模块
Express 官网提供的会话模块 express-session 非常灵活，能够通过 store 参数任意替换会话缓存的存储形式。性能优先的形式是应用 connect-redis 存储在 Redis 缓存服务中，老本优先的形式是应用 connect-session-sequelize 存储在数据库里，本文采纳老本优先的形式存储会话缓存。在上一章已实现的工程 host1-tech/nodejs-server-examples – 05-database 的根目录执行以下装置命令：
$ yarn add express-session # 本地装置 express-session
# ...
info Direct dependencies
└─ express-session@1.17.1
# ...
$ # 本地装置 connect-session-sequelize 6.x 版本，配合 sequelize 5.x 版本
$ yarn add 'connect-session-sequelize@^6.1.1'
# ...
info Direct dependencies
└─ connect-session-sequelize@6.1.1
# ...思考到其余应用 cookie 的状况装置 cookie-parser 对立提供 cookie 解决逻辑：
$ yarn add cookie-parser # 本地装置 cookie-parser
# ...
info Direct dependencies
└─ cookie-parser@1.4.5
# ...繁难登录
当初为店铺治理加上繁难的登录性能。先创立 session 数据库表格构造：
$ # 生成会话 schema 迁徙文件
$ yarn sequelize migration:generate --name create-session
$ tree src/models/migrate # 展现 src/models/migrate 目录内容构造
src/models/migrate
├── 20200725045100-create-shop.js
└── 20200727025727-create-session.js丑化一下 src/models/migrate/20200727025727-create-session.js：
// src/models/migrate/20200727025727-create-session.js
module.exports = {up: async (queryInterface, Sequelize) => {
/**
* Add altering commands here.
*
* Example:
* await queryInterface.createTable('users', { id: Sequelize.INTEGER});
*/
},
down: async (queryInterface, Sequelize) => {
/**
* Add reverting commands here.
*
* Example:
* await queryInterface.dropTable('users');
*/
},
};调整一下 src/models/migrate/20200727025727-create-session.js：
// src/models/migrate/20200727025727-create-session.js
module.exports = {up: async (queryInterface, Sequelize) => {
- /**
- * Add altering commands here.
- *
- * Example:
- * await queryInterface.createTable('users', { id: Sequelize.INTEGER});
- */
+ await queryInterface.createTable('session', {
+ sid: {+ type: DataTypes.STRING(36),
+ },
+ expires: {
+ type: DataTypes.DATE,
+ },
+ data: {
+ type: DataTypes.TEXT,
+ },
+
+ created_at: {
+ allowNull: false,
+ type: Sequelize.DATE,
+ },
+ updated_at: {
+ allowNull: false,
+ type: Sequelize.DATE,
+ },
+ });
},
down: async (queryInterface, Sequelize) => {
- /**
- * Add reverting commands here.
- *
- * Example:
- * await queryInterface.dropTable('users');
- */
+ queryInterface.dropTable('session');
},
};向数据库写入 session 表格构造：
$ yarn sequelize db:migrate # 向数据库写入表格构造，db:migrate 会依据 sequelize_meta 记录只创立 session 表格构造接下来初始化会话模块并补充登录验证的逻辑：
<!-- public/login.html -->
<html>
<head>
<meta charset="utf-8" />
</head>
<body>
<form method="post" action="/api/login">
<button type="submit"> 一键登录 </button>
</form>
</body>
</html>// src/controllers/login.js
const {Router} = require('express');
class LoginController {async init() {const router = Router();
router.post('/', this.post);
return router;
}
post = (req, res) => {
req.session.logined = true;
res.redirect('/');
};
}
module.exports = async () => {const c = new LoginController();
return await c.init();};// src/controllers/index.js
const {Router} = require('express');
const shopController = require('./shop');
const chaosController = require('./chaos');
const healthController = require('./health');
+const loginController = require('./login');
module.exports = async function initControllers() {const router = Router();
router.use('/api/shop', await shopController());
router.use('/api/chaos', await chaosController());
router.use('/api/health', await healthController());
+ router.use('/api/login', await loginController());
return router;
};// src/middlewares/login.js
const {parse} = require('url');
module.exports = function loginMiddleware(
homepagePath = '/',
loginPath = '/login.html',
whiteList = {'/500.html': ['get'],
'/api/health': ['get'],
'/api/login': ['post'],
}
) {whiteList[loginPath] = ['get'];
return (req, res, next) => {const { pathname} = parse(req.url);
if (req.session.logined && pathname == loginPath) {res.redirect(homepagePath);
return;
}
if (
req.session.logined ||
(whiteList[pathname] &&
whiteList[pathname].includes(req.method.toLowerCase()))
) {next();
return;
}
res.redirect(loginPath);
};
};// src/middlewares/session.js
const session = require('express-session');
const sessionSequelize = require('connect-session-sequelize');
const {sequelize} = require('../models');
module.exports = function sessionMiddleware(secret) {const SequelizeStore = sessionSequelize(session.Store);
const store = new SequelizeStore({
db: sequelize,
modelKey: 'Session',
tableName: 'session',
});
return session({
secret,
cookie: {maxAge: 7 * 24 * 60 * 60 * 1000},
store,
resave: false,
proxy: true,
saveUninitialized: false,
});
};// src/middlewares/index.js
const {Router} = require('express');
+const cookieParser = require('cookie-parser');
+const sessionMiddleware = require('./session');
const urlnormalizeMiddleware = require('./urlnormalize');
+const loginMiddleware = require('./login');
+
+const secret = '842d918ced1888c65a650f993077c3d36b8f114d';
module.exports = async function initMiddlewares() {const router = Router();
router.use(urlnormalizeMiddleware());
+ router.use(cookieParser(secret));
+ router.use(sessionMiddleware(secret));
+ router.use(loginMiddleware());
return router;
};// src/server.js
// ...
async function bootstrap() {+ server.use(await initMiddlewares());
server.use(express.static(publicDir));
server.use('/moulds', express.static(mouldsDir));
- server.use(await initMiddlewares());
server.use(await initControllers());
server.use(errorHandler);
await promisify(server.listen.bind(server, port))();
console.log(`> Started on port ${port}`);
}
// ...拜访 http://localhost:9000/ 即可看到成果：
本章源码
host1-tech/nodejs-server-examples – 06-session
更多浏览
从零搭建 Node.js 企业级 Web 服务器（零）：动态服务
从零搭建 Node.js 企业级 Web 服务器（一）：接口与分层
从零搭建 Node.js 企业级 Web 服务器（二）：校验
从零搭建 Node.js 企业级 Web 服务器（三）：中间件
从零搭建 Node.js 企业级 Web 服务器（四）：异样解决
从零搭建 Node.js 企业级 Web 服务器（五）：数据库拜访
从零搭建 Node.js 企业级 Web 服务器（六）：会话
正文完
发表至： javascript
2020-07-27
