koa2-session-redis/lib/redis-store.js

A simple redis store of koa-session

const debug = require('debug')('koa:session-store');
const redis = require("redis");
const bluebird = require("bluebird");

bluebird.promisifyAll(redis.RedisClient.prototype);
bluebird.promisifyAll(redis.Multi.prototype);

/**
 * RedisStore for koa-session
 * 
 * @param {object} options the options pass to node_redis
 * @returns RedisStore instance
 */
function RedisStore(options) {
	if (!(this instanceof RedisStore)) {
		return new RedisStore(options);
	}
	this.client = redis.createClient(options);
	this.client.on('connect', function () {
		debug('connected to redis');
	});
	this.client.on('ready', function () {
		debug('redis ready');
	});
	this.client.on('end', function () {
		debug('redis ended');
	});
	this.client.on('error', function () {
		debug('redis error');
	});
	this.client.on('reconnecting', function () {
		debug('redis reconnecting');
	});
	this.client.on('warning', function () {
		debug('redis warning');
	});
}
RedisStore.prototype.get = async function (key) {
	let json = await this.client.getAsync(key);
	debug(`GET ${key} -> ${json}`);
	return JSON.parse(json);
};
RedisStore.prototype.set = async function (key, sess, ttl) {
	let json = JSON.stringify(sess);
	debug(`SET ${key} -> ${json}`);
	if (typeof ttl === 'number') {
		ttl = Math.ceil(ttl / 1000);
	}
	if (ttl) {
		await this.client.setexAsync(key, ttl, json);
	} else {
		await this.client.setAsync(key, json);
	}
};
RedisStore.prototype.destroy = async function (key) {
	debug(`DELETE ${key}`);
	await this.client.delAsync(key);
};
RedisStore.prototype.quit = async function() {
	debug(`QUIT redis`);
	await this.client.quit();
};

module.exports = RedisStore;