Nuxt/lib/app/server.js

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import Vue from 'vue'
import clone from 'clone'
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import { stringify } from 'querystring'
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import { omit } from 'lodash'
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import middleware from './middleware'
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import { createApp, NuxtError } from './index'
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import { applyAsyncData, sanitizeComponent, getMatchedComponents, getContext, middlewareSeries, promisify, urlJoin } from './utils'
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const debug = require('debug')('nuxt:render')
debug.color = 4 // force blue color
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const isDev = <%= isDev %>
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const noopApp = () => new Vue({ render: (h) => h('div') })
const createNext = context => opts => {
context.redirected = opts
// If nuxt generate
if (!context.res) {
context.nuxt.serverRendered = false
return
}
opts.query = stringify(opts.query)
opts.path = opts.path + (opts.query ? '?' + opts.query : '')
if (opts.path.indexOf('http') !== 0 && ('<%= router.base %>' !== '/' && opts.path.indexOf('<%= router.base %>') !== 0)) {
opts.path = urlJoin('<%= router.base %>', opts.path)
}
// Avoid loop redirect
if (opts.path === context.url) {
context.redirected = false
return
}
context.res.writeHead(opts.status, {
'Location': opts.path
})
context.res.end()
}
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// This exported function will be called by `bundleRenderer`.
// This is where we perform data-prefetching to determine the
// state of our application before actually rendering it.
// Since data fetching is async, this function is expected to
// return a Promise that resolves to the app instance.
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export default async context => {
// Create context.next for simulate next() of beforeEach() when wanted to redirect
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context.redirected = false
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context.next = createNext(context)
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context.beforeRenderFns = []
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const { app, router<%= (store ? ', store' : '') %> } = await createApp(context)
const _app = new Vue(app)
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<% if (store) { %>
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// Add store to the context
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context.store = store
<% } %>
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// Add route to the context
context.route = router.currentRoute
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// Nuxt object
context.nuxt = { layout: 'default', data: [], error: null<%= (store ? ', state: null' : '') %>, serverRendered: true }
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// Add meta infos
context.meta = _app.$meta()
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// Error function
context.error = _app.$options._nuxt.error.bind(_app)
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// Keep asyncData for each matched component in context
context.asyncData = {}
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// Create shared ctx
const ctx = getContext(context, app)
<% if (isDev) { %>const s = isDev && Date.now()<% } %>
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// Resolve components
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let Components = []
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try {
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Components = await Promise.all(getMatchedComponents(router.match(context.url)).map(Component => {
if (typeof Component !== 'function' || Component.cid) {
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return sanitizeComponent(Component)
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}
return Component().then(Component => sanitizeComponent(Component))
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}))
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} catch (err) {
// Throw back error to renderRoute()
throw err
}
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<% if (store) { %>
// Dispatch store nuxtServerInit
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if (store._actions && store._actions.nuxtServerInit) {
await store.dispatch('nuxtServerInit', ctx)
}
// ...If there is a redirect
if (context.redirected) return noopApp()
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<% } %>
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// Call global middleware (nuxt.config.js)
let midd = <%= serialize(router.middleware, { isJSON: true }) %>
midd = midd.map((name) => {
if (typeof middleware[name] !== 'function') {
context.nuxt.error = context.error({ statusCode: 500, message: 'Unknown middleware ' + name })
}
return middleware[name]
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})
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if (!context.nuxt.error) {
await middlewareSeries(midd, ctx)
}
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// ...If there is a redirect
if (context.redirected) return noopApp()
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// Set layout
let layout = Components.length ? Components[0].options.layout : NuxtError.layout
if (typeof layout === 'function') layout = layout(ctx)
await _app.loadLayout(layout)
layout = _app.setLayout(layout)
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// ...Set layout to __NUXT__
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context.nuxt.layout = _app.layoutName
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// Call middleware (layout + pages)
if (!context.nuxt.error) {
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midd = []
if (layout.middleware) midd = midd.concat(layout.middleware)
Components.forEach((Component) => {
if (Component.options.middleware) {
midd = midd.concat(Component.options.middleware)
}
})
midd = midd.map((name) => {
if (typeof middleware[name] !== 'function') {
context.nuxt.error = context.error({ statusCode: 500, message: 'Unknown middleware ' + name })
}
return middleware[name]
})
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await middlewareSeries(midd, ctx)
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// If there is a redirect
if (context.redirected) return noopApp()
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}
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// Call .validate()
let isValid = true
Components.forEach((Component) => {
if (!isValid) return
if (typeof Component.options.validate !== 'function') return
isValid = Component.options.validate({
params: context.route.params || {},
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query: context.route.query || {},
<%= (store ? 'store: ctx.store' : '') %>
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})
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})
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// ...If .validate() returned false
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if (!isValid) {
// Don't server-render the page in generate mode
if (context._generate) {
context.nuxt.serverRendered = false
}
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// Call the 404 error by making the Components array empty
Components = []
}
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// Call asyncData & fetch hooks on components matched by the route.
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let asyncDatas = await Promise.all(Components.map(Component => {
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let promises = []
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// Call asyncData(context)
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if (Component.options.asyncData && typeof Component.options.asyncData === 'function') {
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let promise = promisify(Component.options.asyncData, ctx)
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promise.then(asyncDataResult => {
context.asyncData[Component.cid] = asyncDataResult
applyAsyncData(Component)
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return asyncDataResult
})
promises.push(promise)
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} else {
promises.push(null)
}
// Call fetch(context)
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if (Component.options.fetch) {
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promises.push(Component.options.fetch(ctx))
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}
else {
promises.push(null)
}
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return Promise.all(promises)
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}))
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// If no Components found, returns 404
if (!Components.length) {
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context.nuxt.error = context.error({ statusCode: 404, message: '<%= messages.error_404 %>' })
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}
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<% if (isDev) { %>if (asyncDatas.length) debug('Data fetching ' + context.url + ': ' + (Date.now() - s) + 'ms')<% } %>
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// datas are the first row of each
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context.nuxt.data = asyncDatas.map(r => r[0] || {})
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// If an error occured in the execution
if (_app.$options._nuxt.err) {
context.nuxt.error = _app.$options._nuxt.err
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}
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<% if (store) { %>
// Add the state from the vuex store
context.nuxt.state = store.state
<% } %>
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await Promise.all(context.beforeRenderFns.map((fn) => promisify(fn, { Components, nuxtState: context.nuxt })))
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// If no error, return main app
if (!context.nuxt.error) {
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return _app
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}
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// Load layout for error page
layout = (typeof NuxtError.layout === 'function' ? NuxtError.layout(ctx) : NuxtError.layout)
context.nuxt.layout = layout || ''
await _app.loadLayout(layout)
_app.setLayout(layout)
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return _app
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}