258 lines
4.0 KiB
Markdown
258 lines
4.0 KiB
Markdown
---
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marp: true
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theme: gaia
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paginate: true
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backgroundColor: #fff
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header: "Web Engineering – DHBW Stuttgart"
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footer: "Michael Czechowski – SoSe 2025"
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---
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<style>
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:root {
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--color-foreground: #1a1a2e;
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--color-highlight: #005f8a;
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--color-dimmed: #4a6a7a;
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}
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section.invert {
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--color-foreground: #fff;
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}
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section {
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font-size: 1.7rem;
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}
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h1 {
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color: #005f8a;
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}
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section.invert h1 {
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color: #fff;
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}
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pre {
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background: #0f1e2e;
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color: #00b4d8;
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border-radius: 8px;
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border-left: 3px solid #005f8a;
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}
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pre code {
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background: transparent;
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color: inherit;
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}
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code {
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background: #1a3a4a;
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color: #00b4d8;
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padding: 0.15em 0.4em;
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border-radius: 4px;
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}
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a {
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color: var(--color-highlight);
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}
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</style>
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<!-- _class: invert -->
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<!-- _header: '' -->
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<!-- _backgroundColor: #001520 -->
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# node.js – Advanced
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---
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# node.js – Fun Facts
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- Entwickelt von Ryan Dahl in 2009
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- Erste serverseitige Laufzeitumgebung in JavaScript (C++)
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- Inspiriert von Nginx (Non-blocking I/O)
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**Alternativen heute:**
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- **Deno** (2020): Rust, Tokio
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- **Bun** (2022): Zig
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---
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# process – Prozess-Steuerung
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```javascript
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process.on("SIGINT", () => {
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console.log("Received SIGINT. Closing server...");
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server.close(() => {
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console.log("Server closed.");
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process.exit(0);
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});
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});
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// Signale
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process.exit(0); // Erfolgreich
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process.exit(1); // Fehler
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```
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---
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# node.js Module System
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```javascript
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// ES Modules
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import express from 'express';
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import { port } from './src/config/constants.js';
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// CommonJS
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const fs = require('fs');
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```
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---
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# HTTP Request mit node-fetch
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```javascript
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// Node.js 18+ hat fetch eingebaut
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const res = await fetch('https://api.example.com/data');
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const data = await res.json();
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// Ältere Versionen: node-fetch
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import fetch from 'node-fetch';
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```
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---
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# Web Server, Builder, Bundler
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```bash
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# Boilerplates erstellen
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npm create vite@latest my-app -- --template react
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npm create svelte@latest
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npm create astro@latest
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# nuxt
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npm install nuxt
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npm run dev
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```
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---
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<!-- _header: '' -->
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<!-- _footer: '' -->
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---
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# Express – Grundlagen
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```javascript
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import express from 'express';
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const app = express();
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app.listen(port, () => {
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console.log(`Server läuft auf Port ${port}`);
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});
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```
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---
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# Express – Middleware
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```javascript
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app.use(express.json());
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app.use('/api', (req, res, next) => {
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console.log('Time:', Date.now());
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next();
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});
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app.use((req, res, next) => {
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console.log('Middleware 2');
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next();
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});
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```
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---
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# Express – CRUD Routes
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```javascript
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app.get('/api/:key', async (req, res) => {
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const context = cache.get(req.params.key);
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res.json({ context });
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});
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app.post('/api/:key', async (req, res) => {
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const payload = req.body;
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res.json({ created: cache.set(req.params.key, payload) });
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});
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app.put('/api/:key', async (req, res) => {
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const payload = req.body;
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res.json({ updated: cache.update(req.params.key, payload) });
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});
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app.delete('/api/:key', async (req, res) => {
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cache.remove(req.params.key);
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res.json({ deleted: req.params.key });
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});
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```
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---
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# Express – server.listen
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```javascript
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const server = app.listen(port, () => {
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console.log(`Server läuft auf Port ${port}`);
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});
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server.on('error', (err) => {
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console.error('Server error:', err);
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});
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server.close(() => {
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console.log('Server geschlossen');
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});
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```
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---
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# WebSockets
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```javascript
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import { WebSocketServer } from 'ws';
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const wss = new WebSocketServer({ port: 8080 });
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wss.on('connection', (ws) => {
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console.log('Client verbunden');
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ws.on('message', (data) => {
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console.log('Empfangen:', data.toString());
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ws.send('Pong');
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});
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});
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```
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---
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<!-- _header: '' -->
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<!-- _footer: '' -->
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---
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<!-- _header: '' -->
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<!-- _footer: '' -->
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---
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<!-- _header: '' -->
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<!-- _footer: '' -->
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---
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# Fragen?
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1. Wozu dient `process.on('SIGINT')`?
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2. Was macht `app.use(express.json())`?
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3. Wie erstellst du einen GET-Endpoint mit Express? |