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Add WebAssembly example
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examples/with-webassembly/.gitignore
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examples/with-webassembly/.gitignore
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.next
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examples/with-webassembly/Cargo.toml
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examples/with-webassembly/Cargo.toml
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[package]
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name = "next-rust"
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version = "0.1.0"
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authors = ["Tim Neutkens <timneutkens@me.com>"]
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[dependencies]
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examples/with-webassembly/add.wasm
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examples/with-webassembly/add.wasm
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examples/with-webassembly/next.config.js
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examples/with-webassembly/next.config.js
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module.exports = {
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webpack (config) {
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config.output.webassemblyModuleFilename = 'static/wasm/[modulehash].wasm'
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return config
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}
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}
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examples/with-webassembly/package.json
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examples/with-webassembly/package.json
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{
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"dependencies": {
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"next": "canary",
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"react": "^16.4.2",
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"react-dom": "^16.4.2"
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},
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"scripts": {
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"dev": "node server.js",
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"build": "next build",
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"build-rust": "rustc +nightly --target wasm32-unknown-unknown -O --crate-type=cdylib src/add.rs -o add.wasm",
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"start": "NODE_ENV=production node server.js"
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}
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}
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examples/with-webassembly/pages/index.js
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examples/with-webassembly/pages/index.js
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import {withRouter} from 'next/router'
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import dynamic from 'next/dynamic'
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import Link from 'next/link'
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const RustComponent = dynamic({
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loader: async () => {
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// Import the wasm module
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const rustModule = await import('../add.wasm')
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// Return a React component that calls the add_one method on the wasm module
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return (props) => <div>
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{rustModule.add_one(props.number)}
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</div>
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}
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})
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const Page = ({router: {query}}) => {
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const number = parseInt(query.number || 30)
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return <div>
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<RustComponent number={number} />
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<Link href={`/?number=${number + 1}`}><a>+</a></Link>
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</div>
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}
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export default withRouter(Page)
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examples/with-webassembly/readme.md
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examples/with-webassembly/readme.md
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[![Deploy to now](https://deploy.now.sh/static/button.svg)](https://deploy.now.sh/?repo=https://github.com/zeit/next.js/tree/master/examples/hello-world)
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# WebAssembly example
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## How to use
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### Using `create-next-app`
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Execute [`create-next-app`](https://github.com/segmentio/create-next-app) with [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) or [npx](https://github.com/zkat/npx#readme) to bootstrap the example:
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```bash
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npx create-next-app --example with-webassembly with-webassembly-app
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# or
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yarn create next-app --example with-webassembly with-webassembly-app
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```
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### Download manually
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Download the example:
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```bash
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curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/with-webassembly
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cd with-webassembly
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```
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Install it and run:
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This example uses Rust compiled to wasm, the wasm file is included in the example, but to compile your own Rust code you'll have to [install](https://www.rust-lang.org/en-US/) Rust.
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```bash
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npm install
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npm run dev
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# or
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yarn
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yarn dev
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```
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To compile `src/add.rs` to `add.wasm` use `npm run build-rust`.
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Deploy it to the cloud with [now](https://zeit.co/now) ([download](https://zeit.co/download))
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```bash
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now
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```
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## The idea behind the example
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This example shows how to import WebAssembly files (`.wasm`) and use them inside of a React component that is server rendered. So the WebAssembly code is executed on the server too. In the case of this example we're showing Rust compiled to WebAssembly.
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examples/with-webassembly/server.js
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examples/with-webassembly/server.js
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const { createServer } = require('http')
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const { parse } = require('url')
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const next = require('next')
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const dev = process.env.NODE_ENV !== 'production'
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const app = next({ dev })
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const handle = app.getRequestHandler()
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app.prepare().then(() => {
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createServer((req, res) => {
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// Be sure to pass `true` as the second argument to `url.parse`.
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// This tells it to parse the query portion of the URL.
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const parsedUrl = parse(req.url, true)
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// Set Content-Type to application/wasm for wasm files
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if (parsedUrl.pathname.includes('/_next/static/wasm')) {
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res.setHeader('Content-Type', 'application/wasm')
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}
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handle(req, res, parsedUrl)
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}).listen(3000, err => {
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if (err) throw err
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console.log('> Ready on http://localhost:3000')
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})
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})
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4
examples/with-webassembly/src/add.rs
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examples/with-webassembly/src/add.rs
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#[no_mangle]
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pub extern "C" fn add_one(x: i32) -> i32 {
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x + 1
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}
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