Next.js SSR example

examples/nextjs-ssr-example/.eslintignore

@@ -0,0 +1 @@
+/build/**

examples/nextjs-ssr-example/.eslintrc.cjs

@@ -0,0 +1,44 @@
+module.exports = {
+  env: {
+    browser: true,
+    es2021: true,
+    node: true,
+  },
+  extends: [
+    `eslint:recommended`,
+    `plugin:@typescript-eslint/recommended`,
+    `plugin:prettier/recommended`,
+    `eslint-config-next`,
+  ],
+  parserOptions: {
+    ecmaVersion: 2022,
+    requireConfigFile: false,
+    sourceType: `module`,
+    ecmaFeatures: {
+      jsx: true,
+    },
+  },
+  parser: `@typescript-eslint/parser`,
+  plugins: [`prettier`],
+  rules: {
+    quotes: [`error`, `backtick`],
+    "no-unused-vars": `off`,
+    "@typescript-eslint/no-unused-vars": [
+      `error`,
+      {
+        argsIgnorePattern: `^_`,
+        varsIgnorePattern: `^_`,
+        caughtErrorsIgnorePattern: `^_`,
+      },
+    ],
+    "@next/next/no-img-element": `off`,
+
+  },
+  ignorePatterns: [
+    `**/node_modules/**`,
+    `**/dist/**`,
+    `tsup.config.ts`,
+    `vitest.config.ts`,
+    `.eslintrc.js`,
+  ],
+};

examples/nextjs-ssr-example/.gitignore

@@ -0,0 +1,10 @@
+dist
+.env.local
+
+# Turborepo
+.turbo
+
+# next.js
+/.next/
+/out/
+next-env.d.ts

examples/nextjs-ssr-example/.prettierrc

@@ -0,0 +1,5 @@
+{
+  "trailingComma": "es5",
+  "semi": false,
+  "tabWidth": 2
+}

examples/nextjs-ssr-example/README.md

@@ -0,0 +1,22 @@
+# Next.js SSR example
+
+## Setup
+
+1. Make sure you've installed all dependencies for the monorepo and built packages
+
+From the root directory:
+
+- `pnpm i`
+- `pnpm run -r build`
+
+2. Start the docker containers
+
+`pnpm run backend:up`
+
+3. Start the dev server
+
+`pnpm run dev`
+
+4. When done, tear down the backend containers so you can run other examples
+
+`pnpm run backend:down`

examples/nextjs-ssr-example/app/App.css

@@ -0,0 +1,25 @@
+.App {
+  text-align: center;
+}
+
+.App-logo {
+  height: min(160px, 30vmin);
+  pointer-events: none;
+  margin-top: min(30px, 5vmin);
+  margin-bottom: min(30px, 5vmin);
+}
+
+.App-header {
+  background-color: #1c1e20;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: top;
+  justify-content: top;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}

examples/nextjs-ssr-example/app/Example.css

@@ -0,0 +1,41 @@
+.controls {
+  margin-bottom: 1.5rem;
+}
+
+.button {
+  display: inline-block;
+  line-height: 1.3;
+  text-align: center;
+  text-decoration: none;
+  vertical-align: middle;
+  cursor: pointer;
+  user-select: none;
+  width: calc(15vw + 100px);
+  margin-right: 0.5rem !important;
+  margin-left: 0.5rem !important;
+  border-radius: 32px;
+  text-shadow: 2px 6px 20px rgba(0, 0, 0, 0.4);
+  box-shadow: rgba(0, 0, 0, 0.5) 1px 2px 8px 0px;
+  background: #1e2123;
+  border: 2px solid #229089;
+  color: #f9fdff;
+  font-size: 16px;
+  font-weight: 500;
+  padding: 10px 18px;
+}
+
+.item {
+  display: block;
+  line-height: 1.3;
+  text-align: center;
+  vertical-align: middle;
+  width: calc(30vw - 1.5rem + 200px);
+  margin-right: auto;
+  margin-left: auto;
+  border-radius: 32px;
+  border: 1.5px solid #bbb;
+  box-shadow: rgba(0, 0, 0, 0.3) 1px 2px 8px 0px;
+  color: #f9fdff;
+  font-size: 13px;
+  padding: 10px 18px;
+}

examples/nextjs-ssr-example/app/Home.tsx

@@ -0,0 +1,156 @@
+"use client"
+
+import { v4 as uuidv4 } from "uuid"
+import {
+  useShape,
+  getShapeStream,
+  SerializedShapeData,
+} from "@electric-sql/react"
+import "./Example.css"
+import { matchStream } from "./match-stream"
+import { Offset, ShapeStreamOptions } from "@electric-sql/client"
+import { useOptimistic } from "react"
+
+const parser = {
+  timestamptz: (date: string) => new Date(date).getTime(),
+}
+
+const shapePosition: { shapeId?: string; offset?: Offset } = {
+  shapeId: undefined,
+  offset: `-1`,
+}
+
+const baseItemShape: () => ShapeStreamOptions = () => {
+  if (typeof window !== `undefined`) {
+    return {
+      url: new URL(`/shape-proxy/items`, window?.location.origin).href,
+    }
+  } else {
+    const controller = new AbortController()
+    controller.abort()
+    return {
+      url: new URL(`https://not-sure-how-this-works.com/shape-proxy/items`)
+        .href,
+      signal: controller.signal,
+      subscribe: false,
+    }
+  }
+}
+const itemShape = () => ({ ...baseItemShape(), ...shapePosition })
+
+const updateShapePosition = (offset: Offset, shapeId?: string) => {
+  shapePosition.offset = offset
+  shapePosition.shapeId = shapeId
+}
+
+type Item = { id: string; created_at: number }
+
+async function createItem(newId: string) {
+  const itemsStream = getShapeStream(itemShape())
+
+  // Match the insert
+  const findUpdatePromise = matchStream({
+    stream: itemsStream,
+    operations: [`insert`],
+    matchFn: ({ message }) => message.value.id === newId,
+  })
+
+  // Generate new UUID and post to backend
+  const fetchPromise = fetch(`/api/items`, {
+    method: `POST`,
+    body: JSON.stringify({ uuid: newId }),
+  })
+
+  return await Promise.all([findUpdatePromise, fetchPromise])
+}
+
+async function clearItems() {
+  const itemsStream = getShapeStream(itemShape())
+  // Match the delete
+  const findUpdatePromise = matchStream({
+    stream: itemsStream,
+    operations: [`delete`],
+    // First delete will match
+    matchFn: () => true,
+  })
+  // Post to backend to delete everything
+  const fetchPromise = fetch(`/api/items`, {
+    method: `DELETE`,
+  })
+
+  return await Promise.all([findUpdatePromise, fetchPromise])
+}
+
+export default function Home({
+  shapes,
+}: {
+  shapes: { items: SerializedShapeData }
+}) {
+  const { shapeId, offset, data } = shapes.items
+  updateShapePosition(offset, shapeId)
+
+  const { data: items } = useShape({
+    ...itemShape(),
+    shapeData: new Map(Object.entries(data ?? new Map())),
+    parser,
+  }) as unknown as {
+    data: Item[]
+  }
+
+  const [optimisticItems, updateOptimisticItems] = useOptimistic<
+    Item[],
+    { newId?: string; isClear?: boolean }
+  >(items, (state, { newId, isClear }) => {
+    if (isClear) {
+      return []
+    }
+
+    if (newId) {
+      // Merge data from shape & optimistic data from fetchers. This removes
+      // possible duplicates as there's a potential race condition where
+      // useShape updates from the stream slightly before the action has finished.
+      const itemsMap = new Map()
+      state
+        .concat([{ id: newId, created_at: new Date().getTime() }])
+        .forEach((item) => {
+          itemsMap.set(item.id, { ...itemsMap.get(item.id), ...item })
+        })
+      return Array.from(itemsMap.values())
+    }
+
+    return []
+  })
+
+  return (
+    <div>
+      <form
+        action={async (formData: FormData) => {
+          const intent = formData.get(`intent`)
+          const newId = formData.get(`new-id`) as string
+          if (intent === `add`) {
+            updateOptimisticItems({ newId })
+            await createItem(newId)
+          } else if (intent === `clear`) {
+            updateOptimisticItems({ isClear: true })
+            await clearItems()
+          }
+        }}
+      >
+        <input type="hidden" name="new-id" value={uuidv4()} />
+        <button type="submit" className="button" name="intent" value="add">
+          Add
+        </button>
+        <button type="submit" className="button" name="intent" value="clear">
+          Clear
+        </button>
+      </form>
+      {optimisticItems
+        .sort((a, b) => a.created_at - b.created_at)
+        .map((item: Item, index: number) => (
+          <p key={index} className="item">
+            <code>{item.id}</code>
+          </p>
+        ))}
+    </div>
+  )
+}

examples/nextjs-ssr-example/app/api/items/route.ts

@@ -0,0 +1,17 @@
+import { db } from "../../db"
+import { NextResponse } from "next/server"
+
+export async function POST(request: Request) {
+  const body = await request.json()
+  const result = await db.query(
+    `INSERT INTO items (id)
+    VALUES ($1) RETURNING id;`,
+    [body.uuid]
+  )
+  return NextResponse.json({ id: result.rows[0].id })
+}
+
+export async function DELETE() {
+  await db.query(`DELETE FROM items;`)
+  return NextResponse.json(`ok`)
+}

examples/nextjs-ssr-example/app/db.ts

@@ -0,0 +1,14 @@
+import pgPkg from "pg"
+const { Client } = pgPkg
+
+const db = new Client({
+  host: `localhost`,
+  port: 54321,
+  password: `password`,
+  user: `postgres`,
+  database: `electric`,
+})
+
+db.connect()
+
+export { db }

examples/nextjs-ssr-example/app/layout.tsx

@@ -0,0 +1,26 @@
+import "./style.css"
+import "./App.css"
+
+export const metadata = {
+  title: `Next.js Forms Example`,
+  description: `Example application with forms and Postgres.`,
+}
+
+export default function RootLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  return (
+    <html lang="en">
+      <body>
+        <div className="App">
+          <header className="App-header">
+            <img src="/logo.svg" className="App-logo" alt="logo" />
+            {children}
+          </header>
+        </div>
+      </body>
+    </html>
+  )
+}