ssr.js
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const fs = require('fs');
const path = require('path');
const rp = require('request-promise');
const LRU = require('lru-cache');
const url = require('url');
const _ = require('lodash');
const pkg = require('../../package.json');
const logger = global.yoho.logger;
const {createBundleRenderer} = require('vue-server-renderer');
const routes = [
{
route: /product\/\d+/,
cache: true,
// disable: true
},
{
route: '/channel',
cacheRule: 'pathname',
cache: true
},
{
route: '/channel/search',
cacheRule: 'pathname',
cache: true
},
{
route: '/channel/men',
cacheRule: 'pathname',
cache: true
},
{
route: '/channel/women',
cacheRule: 'pathname',
cache: true
},
{
route: '/about',
cacheRule: 'pathname',
cache: true
},
];
const isDev = process.env.NODE_ENV === 'development' || !process.env.NODE_ENV;
let renderer;
let template = fs.readFileSync(path.join(__dirname, '../../src/index.html'), 'utf-8');
const microCache = LRU({ // eslint-disable-line
max: 1000,
maxAge: 2000
});
const getContext = (req) => {
return {
url: req.url,
title: 'BLK！',
user: req.user,
env: {
isApp: req.yoho.isApp,
isiOS: req.yoho.isiOS,
isAndroid: req.yoho.isAndroid,
isYohoBuy: req.yoho.isYohoBuy,
channel: req.yoho.channel
}
};
};
const render = ({cache, cacheRule}) => {
return (req, res, next) => {
const reqUrl = url.parse(req.url);
if (cache && reqUrl[cacheRule]) {
const html = microCache.get(reqUrl[cacheRule]);
if (html) {
console.log('cache', req.url);
return res.send(html);
}
}
let context = getContext(req);
renderer.renderToString(context, (err, html) => {
if (err) {
// TODO 处理错误类型
return next(err);
}
if (cache && reqUrl[cacheRule]) {
microCache.set(reqUrl[cacheRule], html);
}
return res.send(html);
});
};
};
const devRender = () => {
return (req, res, next) => {
let context = getContext(req);
process.send({action: 'ssr_request', context});
let event = msg => {
process.removeListener('message', event);
if (msg.action === 'ssr_request') {
if (msg.err) {
try {
const err = JSON.parse(msg.err);
if (err.code === 404) {
return next();
}
return next(err);
} catch (e) {
return next({
code: 500,
message: msg.err
});
}
}
return res.end(msg.html);
}
};
process.on('message', event);
};
};
const loadBundle = async (errorCount = 0) => {
if (!isDev) {
if (errorCount > 5) {
throw {
code: 9999,
message: 'ssr bundle download faild 5!'
};
}
await Promise.all([
rp(`http://cdn.yoho.cn/yohoblk-wap/bundle/yoho-ssr-server-${pkg.version}.json`, {json: true}),
rp(`http://cdn.yoho.cn/yohoblk-wap/bundle/yoho-ssr-client-${pkg.version}.json`, {json: true}),
]).then(results => {
logger.warn('ssr file is loaded');
renderer = createBundleRenderer(results[0], {
runInNewContext: false,
template,
clientManifest: results[1]
});
}).catch(() => {
return loadBundle(errorCount + 1);
});
// const serverBundle = require(`../../public/dist/yohoblk-wap/bundle/yoho-ssr-server-${pkg.version}.json`);
// const clientManifest = require(`../../public/dist/yohoblk-wap/bundle/yoho-ssr-client-${pkg.version}.json`);
// renderer = createBundleRenderer(serverBundle, {
// runInNewContext: false,
// template,
// clientManifest
// });
}
};
const ssrRender = options => isDev ? devRender(options) : render(options);
module.exports = async (app) => {
await loadBundle();
_.each(routes, r => {
if (!r.disable) {
app.get(r.route, ssrRender(r));
}
});
};