Nuxt/app/server.js

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'use strict'
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import Vue from 'vue'
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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'
const debug = require('debug')('nuxt:render')
debug.color = 4 // force blue color
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const isDev = <%= isDev %>
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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) => {
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// create context.next for simulate next() of beforeEach() when wanted to redirect
context.redirected = false
context.next = function (opts) {
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context.redirected = opts
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// if nuxt generate
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if (!context.res) {
context.nuxt.serverRendered = false
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return
}
opts.query = stringify(opts.query)
opts.path = opts.path + (opts.query ? '?' + opts.query : '')
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if (opts.path.indexOf('http') !== 0 && ('<%= router.base %>' !== '/' && opts.path.indexOf('<%= router.base %>') !== 0)) {
opts.path = urlJoin('<%= router.base %>', opts.path)
}
context.res.writeHead(opts.status, {
'Location': opts.path
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})
context.res.end()
}
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const { app, router<%= (store ? ', store' : '') %> } = await createApp(context)
const _app = new Vue(app)
const _noopApp = new Vue({ render: (h) => h('div') })
// Add store to the context
<%= (store ? 'context.store = store' : '') %>
// Add route to the context
context.route = router.currentRoute
// Nuxt object
context.nuxt = { layout: 'default', data: [], error: null<%= (store ? ', state: null' : '') %>, serverRendered: true }
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// Add meta infos
context.meta = _app.$meta()
// Error function
context.error = _app.$options._nuxt.error.bind(_app)
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<%= (isDev ? 'const s = isDev && Date.now()' : '') %>
let ctx = getContext(context, app)
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let Components = []
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let promises = getMatchedComponents(router.match(context.url)).map((Component) => {
return new Promise((resolve, reject) => {
if (typeof Component !== 'function' || Component.super === Vue) return resolve(sanitizeComponent(Component))
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const _resolve = (Component) => resolve(sanitizeComponent(Component))
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Component().then(_resolve).catch(reject)
})
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})
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try {
Components = await Promise.all(promises)
} catch (err) {
// Throw back error to renderRoute()
throw err
}
// nuxtServerInit
<% if (store) { %>
let promise = (store._actions && store._actions.nuxtServerInit ? store.dispatch('nuxtServerInit', omit(getContext(context, app), 'redirect', 'error')) : null)
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if (!promise || (!(promise instanceof Promise) && (typeof promise.then !== 'function'))) promise = Promise.resolve()
<% } else { %>
let promise = Promise.resolve()
<% } %>
await promise
// 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)
}
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)
// Set layout to __NUXT__
context.nuxt.layout = _app.layoutName
// Call middleware (layout + pages)
midd = []
if (layout.middleware) midd = midd.concat(layout.middleware)
Components.forEach((Component) => {
if (Component.options.middleware) {
midd = midd.concat(Component.options.middleware)
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}
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})
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midd = midd.map((name) => {
if (typeof middleware[name] !== 'function') {
context.nuxt.error = context.error({ statusCode: 500, message: 'Unknown middleware ' + name })
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}
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return middleware[name]
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})
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if (!context.nuxt.error) {
await middlewareSeries(midd, ctx)
}
if (context.redirected) return _noopApp
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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 || {},
query: context.route.query || {}<%= (store ? ', store: ctx.store' : '') %>
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})
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})
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// If .validate() returned false
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 = []
}
// Call asyncData & fetch hooks on components matched by the route.
let asyncDatas = await Promise.all(Components.map((Component) => {
let promises = []
if (Component.options.asyncData && typeof Component.options.asyncData === 'function') {
let promise = promisify(Component.options.asyncData, ctx)
// Call asyncData(context)
promise.then((asyncDataResult) => {
applyAsyncData(Component, asyncDataResult)
return asyncDataResult
})
promises.push(promise)
} else promises.push(null)
// call fetch(context)
if (Component.options.fetch) promises.push(Component.options.fetch(ctx))
else promises.push(null)
return Promise.all(promises)
}))
// If no Components found, returns 404
if (!Components.length) {
context.nuxt.error = context.error({ statusCode: 404, message: 'This page could not be found.' })
}
<% if (isDev) { %>
if (asyncDatas.length) debug('Data fetching ' + context.url + ': ' + (Date.now() - s) + 'ms')
<% } %>
// datas are the first row of each
context.nuxt.data = asyncDatas.map((r) => (r[0] || {}))
// If an error occured in the execution
if (_app.$options._nuxt.err) {
context.nuxt.error = _app.$options._nuxt.err
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}
<%= (store ? '// Add the state from the vuex store' : '') %>
<%= (store ? 'context.nuxt.state = store.state' : '') %>
// If no error, return main app
if (!context.nuxt.error) {
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return _app
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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)
return _app
// if (typeof error === 'string') {
// error = { statusCode: 500, message: error }
// }
// context.nuxt.error = context.error(error)
// <%= (store ? 'context.nuxt.state = store.state' : '') %>
// return _app
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}