create-bundle-renderer.js
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/* @flow */
import { createPromiseCallback } from '../util'
import { createBundleRunner } from './create-bundle-runner'
import type { Renderer, RenderOptions } from '../create-renderer'
import { createSourceMapConsumers, rewriteErrorTrace } from './source-map-support'
const fs = require('fs')
const path = require('path')
const PassThrough = require('stream').PassThrough
const INVALID_MSG =
'Invalid server-rendering bundle format. Should be a string ' +
'or a bundle Object of type:\n\n' +
`{
entry: string;
files: { [filename: string]: string; };
maps: { [filename: string]: string; };
}\n`
// The render bundle can either be a string (single bundled file)
// or a bundle manifest object generated by vue-ssr-webpack-plugin.
type RenderBundle = {
basedir?: string;
entry: string;
files: { [filename: string]: string; };
maps: { [filename: string]: string; };
modules?: { [filename: string]: Array<string> };
};
export function createBundleRendererCreator (
createRenderer: (options?: RenderOptions) => Renderer
) {
return function createBundleRenderer (
bundle: string | RenderBundle,
rendererOptions?: RenderOptions = {}
) {
let files, entry, maps
let basedir = rendererOptions.basedir
// load bundle if given filepath
if (
typeof bundle === 'string' &&
/\.js(on)?$/.test(bundle) &&
path.isAbsolute(bundle)
) {
if (fs.existsSync(bundle)) {
const isJSON = /\.json$/.test(bundle)
basedir = basedir || path.dirname(bundle)
bundle = fs.readFileSync(bundle, 'utf-8')
if (isJSON) {
try {
bundle = JSON.parse(bundle)
} catch (e) {
throw new Error(`Invalid JSON bundle file: ${bundle}`)
}
}
} else {
throw new Error(`Cannot locate bundle file: ${bundle}`)
}
}
if (typeof bundle === 'object') {
entry = bundle.entry
files = bundle.files
basedir = basedir || bundle.basedir
maps = createSourceMapConsumers(bundle.maps)
if (typeof entry !== 'string' || typeof files !== 'object') {
throw new Error(INVALID_MSG)
}
} else if (typeof bundle === 'string') {
entry = '__vue_ssr_bundle__'
files = { '__vue_ssr_bundle__': bundle }
maps = {}
} else {
throw new Error(INVALID_MSG)
}
const renderer = createRenderer(rendererOptions)
const run = createBundleRunner(
entry,
files,
basedir,
rendererOptions.runInNewContext
)
return {
renderToString: (context?: Object, cb: any) => {
if (typeof context === 'function') {
cb = context
context = {}
}
let promise
if (!cb) {
({ promise, cb } = createPromiseCallback())
}
run(context).catch(err => {
rewriteErrorTrace(err, maps)
cb(err)
}).then(app => {
if (app) {
renderer.renderToString(app, context, (err, res) => {
rewriteErrorTrace(err, maps)
cb(err, res)
})
}
})
return promise
},
renderToStream: (context?: Object) => {
const res = new PassThrough()
run(context).catch(err => {
rewriteErrorTrace(err, maps)
// avoid emitting synchronously before user can
// attach error listener
process.nextTick(() => {
res.emit('error', err)
})
}).then(app => {
if (app) {
const renderStream = renderer.renderToStream(app, context)
renderStream.on('error', err => {
rewriteErrorTrace(err, maps)
res.emit('error', err)
})
// relay HTMLStream special events
if (rendererOptions && rendererOptions.template) {
renderStream.on('beforeStart', () => {
res.emit('beforeStart')
})
renderStream.on('beforeEnd', () => {
res.emit('beforeEnd')
})
}
renderStream.pipe(res)
}
})
return res
}
}
}
}