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server.js
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server.js
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const fs = require('fs');
const path = require('path');
const express = require('express');
const LRU = require('lru-cache');
const { createBundleRenderer } = require('vue-server-renderer');
const devServer = require('./build/setup.dev.server')
const resolve = file => path.resolve(__dirname, file);
const isProd = process.env.NODE_ENV === 'production';
const app = express();
const microCache = LRU({
max: 100,
maxAge: 1000 // 重要提示:条目在 1 秒后过期。
})
const isCacheable = req => {
// 实现逻辑为,检查请求是否是用户特定(user-specific)。
// 只有非用户特定(non-user-specific)页面才会缓存
return true
}
const serve = (path, cache) =>
express.static(resolve(path), {
maxAge: cache && isProd ? 1000 * 60 * 60 * 24 * 30 : 0
});
app.use('/dist', serve('./dist', true));
function createRenderer(bundle, options) {
return createBundleRenderer(
bundle,
Object.assign(options, {
basedir: resolve('./dist'),
runInNewContext: false
})
);
}
function render(req, res) {
const cacheable = isCacheable(req)
if (cacheable) {
const hit = microCache.get(req.url)
if (hit) {
console.log('Response from cache')
return res.end(hit)
}
}
const startTime = Date.now();
res.setHeader('Content-Type', 'text/html');
const handleError = err => {
if (err.url) {
res.redirect(err.url);
} else if (err.code === 404) {
res.status(404).send('404 | Page Not Found');
} else {
res.status(500).send('500 | Internal Server Error~');
console.log(err)
}
};
const context = {
title: 'vue ssr 初探', // default title
url: req.url
};
renderer.renderToString(context, (err, html) => {
if (err) {
return handleError(err);
}
res.send(html);
if (cacheable) {
microCache.set(req.url, html)
}
if (!isProd) {
console.log(`whole request: ${Date.now() - startTime}ms`);
}
});
}
let renderer;
let readyPromise;
const templatePath = resolve('./src/index.template.html');
if (isProd) {
const template = fs.readFileSync(templatePath, 'utf-8');
const bundle = require('./dist/vue-ssr-server-bundle.json');
const clientManifest = require('./dist/vue-ssr-client-manifest.json') // 将js文件注入到页面中
renderer = createRenderer(bundle, {
template,
clientManifest
});
} else {
readyPromise = devServer(
app,
templatePath,
(bundle, options) => {
renderer = createRenderer(bundle, options);
}
);
}
app.get(
'*',
isProd
? render
: (req, res) => {
readyPromise.then(() => render(req, res));
}
);
const port = process.env.PORT || 8002;
app.listen(port, () => {
console.log(`server started at localhost:${port}`);
});