yoho-session.js
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const config = global.yoho.config;
const memcachedSession = require('yoho-express-session');
const _ = require('lodash');
const uuid = require('uuid');
const cookieSession = require('client-sessions');
const memcached = require('connect-memcached');
const MemcachedStore = memcached(memcachedSession);
/**
* 该中间件主要把 express-session 和 client-session 集中起来处理，如果 memcached 出错了，使用 cookie session
* @param opts.backSession cookieSession 的键名
* @returns {function(*=, *=, *)}
*/
function yohoSession(opts) {
return (req, res, next) => {
let notUseMemcached = _.get(req.app.locals.pc, 'session.removeMemcached', false);
opts.backSession = opts.backSession || 'session2';
if (req.session && !notUseMemcached) {
req.sessionError = false;
} else {
// 重建 session
res.emit('sessionError');
req.sessionError = true;
req.sessionID = req.sessionID || uuid.v4();
req.session = new memcachedSession.Session(req, req[opts.backSession].sessionBack);
req.session.cookie = new memcachedSession.Cookie({
domain: config.cookieDomain,
httpOnly: false
});
}
Object.defineProperty(req.session, 'reset', {
configurable: true,
enumerable: false,
value: function() {
req.session.destroy();
req[opts.backSession].reset();
},
writable: false
});
// 备份数据
req[opts.backSession].sessionBack = req.session;
next();
};
}
module.exports = (app) => {
app.use(memcachedSession({ // eslint-disable-line
proxy: true,
resave: false,
saveUninitialized: true,
unset: 'destroy',
secret: '82dd7e724f2c6870472c89dfa43cf48d',
name: 'yohobuy_session',
cookie: {
domain: config.cookieDomain,
httpOnly: false
},
getid() {
return uuid.v4();
},
store: new MemcachedStore({
hosts: config.memcache.session,
prefix: config.sessionMemcachedPrefix,
reconnect: 5000,
timeout: 1000,
retries: 0
})
}));
app.use(cookieSession({ // eslint-disable-line
requestKey: 'session2',
cookieName: 'yohobuy_session_cookie',
secret: '82dd7e724f2c6870472c89dfa43cf48d',
cookie: {
domain: config.cookieDomain,
ephemeral: true
}
}));
app.use(yohoSession({
backSession: 'session2'
}));
};