Store.js

const Redis = require("ioredis");
const {Store} = require("koa-session2");

class RedisStore extends Store {
    constructor() {
        super();
        this.redis = new Redis();
    }
    async get(sid, ctx) {
        let data = await this.redis.get(`SESSION:${sid}`);
        return JSON.parse(data);
    }
    async set(session, {
        sid = this.getID(24),
        maxAge = 1000000
    } = {}, ctx) {
        try {
            // Use redis set EX to automatically drop expired sessions
            await this.redis.set(`SESSION:${sid}`, JSON.stringify(session), 'EX', maxAge / 1000);
        } catch (e) {}
        return sid;
    }
    async expired(sid,ctx){
        let  expired = await this.redis.exists(`SESSION:${sid}`);
        return expired;
    }
    //判断剩余时间
    async laveTime(sid, ctx) {
        let time = await this.redis.ttl(`SESSION:${sid}`);
        return time;
    }
    async destroy(sid, ctx) {
        return await this.redis.del(`SESSION:${sid}`);
    }
}

module.exports = RedisStore;