koa-session 持久化

一、使用mongoose链接数据库

'use strict';

const mongoose = require('mongoose');
const config = require('config-lite')({
    filename: 'default',
    config_basedir: __dirname,
    config_dir: 'config'
});
const chalk = require('chalk');

mongoose.connect(config.url, { dbName: config.db, useNewUrlParser: true, autoIndex: false });


const connect = mongoose.connection;

connect.once('open', () => {
    console.log(
        chalk.green('connect db success！')
    );
})

connect.on('error', function (error) {
    console.error(
        chalk.red('Error in MongoDb connection: ' + error)
    );
    mongoose.disconnect();
});

connect.on('close', function () {
    console.log(
        chalk.red('the db is disconnect ,reconnect...')
    );
    mongoose.connect(config.url, { server: { autoReconnect: true } });
});

module.exports = connect;

　二、新建一个store.js文件

const { Store } = require('koa-session2');
module.exports = class extends Store {
    constructor(con) {
        super();
        this.collection = con.collection('sessions');
        console.log("session start ");
    }
    async get(sid) {
        return await this.collection.findOne({ sid });
    }
    async set(session, opts) {
        try {
            if (!opts.sid) {
                opts.sid = this.getID(24);
            }
            await this.collection.findOneAndUpdate({ sid: opts.sid }, { $set: session }, { upsert: true });
        } catch (error) {
            console.log("error", error);
        }
        return opts.sid;
    }
    async destory(sid) {
        await this.collection.findAndModify({ sid }, [], {}, { removed: true });
    }
}

　　

三、在app.js中

const session = require("koa-session2");
const sessionStore = require('./middlewares/seesionStore/store');
app.use(session({
  key: config.session.key,
  maxAge: config.session.maxAge,
  domain: config.session.domain,
  store: new sessionStore(connect)
}));