@data-client/ssr

v0.12.2

Published

a day ago

Server Side Rendering helpers for Data Client

Downloads

1,592

📖Read The Docs | 🎮NextJS Demo

Hydrate/dehydration utilities for Server Side Rendering with the Reactive Data Client

Usage

Integration with

NextJS
Anansi
```
npx @anansi/cli hatch my-project
```
ExpressJS

For more details, see the Server Side Rendering docs page.

NextJS

We've optimized integration into NextJS with a custom Document and NextJS specific wrapper for App

import { DataClientDocument } from '@data-client/ssr/nextjs';

export default DataClientDocument;

import { AppCacheProvider } from '@data-client/ssr/nextjs';

export default function App({ Component, pageProps }: AppProps) {
  return (
    <AppCacheProvider>
      <Component {...pageProps} />
    </AppCacheProvider>
  );
}

Further customizing Document

To further customize Document, simply extend from the provided document.

Make sure you use super.getInitialProps() instead of Document.getInitialProps() or the Data Client code won't run!

import { Html, Head, Main, NextScript } from 'next/document'
import { DataClientDocument } from '@data-client/ssr/nextjs';

export default class MyDocument extends DataClientDocument {
  static async getInitialProps(ctx) {
    const originalRenderPage = ctx.renderPage

    // Run the React rendering logic synchronously
    ctx.renderPage = () =>
      originalRenderPage({
        // Useful for wrapping the whole react tree
        enhanceApp: (App) => App,
        // Useful for wrapping in a per-page basis
        enhanceComponent: (Component) => Component,
      })

    // Run the parent `getInitialProps`, it now includes the custom `renderPage`
    const initialProps = await super.getInitialProps(ctx)

    return initialProps
  }

  render() {
    return (
      <Html>
        <Head />
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    )
  }
}

CSP Nonce

Data Client Document serializes the store state in a script tag. In case you have Content Security Policy restrictions that require use of a nonce, you can override DataClientDocument.getNonce.

Since there is no standard way of handling nonce in NextJS, this allows you to retrieve any nonce you created in the DocumentContext to use with Data Client.

import { DataClientDocument } from '@data-client/ssr/nextjs';

export default class MyDocument extends DataClientDocument {
  static getNonce(ctx: DocumentContext) {
    // this assumes nonce has been added here - customize as you need
    return ctx.res.nonce;
  }
}

Express JS

Server side

import express from 'express';
import { renderToPipeableStream } from 'react-dom/server';
import {
  createPersistedStore,
  createServerDataComponent,
} from '@data-client/ssr';

const rootId = 'react-root';

const app = express();
app.get('/*', (req: any, res: any) => {
  const [ServerCacheProvider, useReadyCacheState, controller] =
    createPersistedStore();
  const ServerDataComponent = createServerDataComponent(useReadyCacheState);

  controller.fetch(NeededForPage, { id: 5 });

  const { pipe, abort } = renderToPipeableStream(
    <Document
      assets={assets}
      scripts={[<ServerDataComponent key="server-data" />]}
      rootId={rootId}
    >
      <ServerCacheProvider>{children}</ServerCacheProvider>
    </Document>,

    {
      onCompleteShell() {
        // If something errored before we started streaming, we set the error code appropriately.
        res.statusCode = didError ? 500 : 200;
        res.setHeader('Content-type', 'text/html');
        pipe(res);
      },
      onError(x: any) {
        didError = true;
        console.error(x);
        res.statusCode = 500;
        pipe(res);
      },
    },
  );
  // Abandon and switch to client rendering if enough time passes.
  // Try lowering this to see the client recover.
  setTimeout(abort, 1000);
});

app.listen(3000, () => {
  console.log(`Listening at ${PORT}...`);
});

Client

import { hydrateRoot } from 'react-dom';
import { awaitInitialData } from '@data-client/ssr';

const rootId = 'react-root';

awaitInitialData().then(initialState => {
  hydrateRoot(
    document.getElementById(rootId),
    <CacheProvider initialState={initialState}>{children}</CacheProvider>,
  );
});

API

createPersistedStore(managers) => [ServerCacheProvider, useReadyCacheState, controller, store]

Used to server side render cache. Renders <ServerDataComponent/> inside to serialize cache so client can hydrate.

createServerDataComponent(useReadyCacheState, id = 'data-client-data')

Contents are a script with JSON encoding of cache state sent from server. Be sure to place outside hydration element so React will not need to hydrate it.

getInitialData(id = 'data-client-data') => Promise(State)

Resolves promise with serialized initialState to pass to <CacheProvider />

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