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backend/scripts/compress-assets.js
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238
backend/scripts/compress-assets.js
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#!/usr/bin/env node
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/**
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* Asset-Komprimierungsskript für MYP Backend
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* Komprimiert CSS und JS-Dateien mit gzip für bessere Performance
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*/
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const fs = require('fs');
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const path = require('path');
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const zlib = require('zlib');
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const { promisify } = require('util');
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const gzip = promisify(zlib.gzip);
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const readFile = promisify(fs.readFile);
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const writeFile = promisify(fs.writeFile);
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const stat = promisify(fs.stat);
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// Konfiguration
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const STATIC_DIR = path.join(__dirname, '..', 'static');
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const COMPRESSION_LEVEL = 9; // Maximale Komprimierung
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// Dateierweiterungen die komprimiert werden sollen
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const COMPRESSIBLE_EXTENSIONS = ['.css', '.js', '.html', '.svg', '.json'];
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// Mindestgröße für Komprimierung (in Bytes)
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const MIN_SIZE_FOR_COMPRESSION = 1024; // 1KB
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/**
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* Komprimiert eine einzelne Datei
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*/
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async function compressFile(filePath) {
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try {
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const stats = await stat(filePath);
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// Überspringe kleine Dateien
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if (stats.size < MIN_SIZE_FOR_COMPRESSION) {
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console.log(`⏭️ Überspringe ${filePath} (zu klein: ${stats.size} bytes)`);
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return;
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}
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const data = await readFile(filePath);
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const compressed = await gzip(data, { level: COMPRESSION_LEVEL });
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const gzPath = filePath + '.gz';
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await writeFile(gzPath, compressed);
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const compressionRatio = ((stats.size - compressed.length) / stats.size * 100).toFixed(1);
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const originalSize = formatBytes(stats.size);
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const compressedSize = formatBytes(compressed.length);
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console.log(`✅ ${path.basename(filePath)}: ${originalSize} → ${compressedSize} (-${compressionRatio}%)`);
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} catch (error) {
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console.error(`❌ Fehler beim Komprimieren von ${filePath}:`, error.message);
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}
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}
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/**
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* Durchsucht Verzeichnis rekursiv nach komprimierbaren Dateien
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*/
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async function findCompressibleFiles(dir) {
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const files = [];
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try {
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const entries = await fs.promises.readdir(dir, { withFileTypes: true });
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for (const entry of entries) {
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const fullPath = path.join(dir, entry.name);
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if (entry.isDirectory()) {
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// Rekursiv in Unterverzeichnisse
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const subFiles = await findCompressibleFiles(fullPath);
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files.push(...subFiles);
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} else if (entry.isFile()) {
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const ext = path.extname(entry.name);
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// Überspringe bereits komprimierte Dateien
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if (entry.name.endsWith('.gz')) {
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continue;
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}
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// Prüfe ob Dateiart komprimierbar ist
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if (COMPRESSIBLE_EXTENSIONS.includes(ext)) {
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files.push(fullPath);
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}
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}
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}
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} catch (error) {
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console.warn(`⚠️ Kann Verzeichnis nicht lesen: ${dir} - ${error.message}`);
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}
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return files;
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}
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/**
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* Formatiert Byte-Größen lesbar
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*/
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function formatBytes(bytes) {
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if (bytes === 0) return '0 B';
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const k = 1024;
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const sizes = ['B', 'KB', 'MB', 'GB'];
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const i = Math.floor(Math.log(bytes) / Math.log(k));
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return parseFloat((bytes / Math.pow(k, i)).toFixed(1)) + ' ' + sizes[i];
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}
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/**
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* Bereinigt alte .gz-Dateien
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*/
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async function cleanupOldGzFiles(dir) {
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try {
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const entries = await fs.promises.readdir(dir, { withFileTypes: true });
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let cleaned = 0;
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for (const entry of entries) {
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const fullPath = path.join(dir, entry.name);
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if (entry.isDirectory()) {
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cleaned += await cleanupOldGzFiles(fullPath);
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} else if (entry.name.endsWith('.gz')) {
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const originalPath = fullPath.slice(0, -3); // Entferne .gz
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try {
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await stat(originalPath);
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// Original existiert, behalte .gz
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} catch (error) {
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// Original existiert nicht, lösche .gz
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await fs.promises.unlink(fullPath);
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console.log(`🗑️ Bereinigt: ${entry.name}`);
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cleaned++;
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}
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}
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}
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return cleaned;
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} catch (error) {
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console.warn(`⚠️ Fehler beim Bereinigen von ${dir}: ${error.message}`);
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return 0;
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}
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}
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/**
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* Hauptfunktion
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*/
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async function main() {
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console.log('🚀 MYP Asset-Komprimierung gestartet...\n');
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const startTime = Date.now();
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// Bereinige alte .gz-Dateien
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console.log('🧹 Bereinige alte komprimierte Dateien...');
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const cleanedFiles = await cleanupOldGzFiles(STATIC_DIR);
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if (cleanedFiles > 0) {
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console.log(`✅ ${cleanedFiles} verwaiste .gz-Dateien bereinigt\n`);
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} else {
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console.log('✅ Keine Bereinigung erforderlich\n');
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}
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// Finde alle komprimierbaren Dateien
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console.log('🔍 Suche nach komprimierbaren Dateien...');
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const files = await findCompressibleFiles(STATIC_DIR);
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console.log(`📁 ${files.length} komprimierbare Dateien gefunden\n`);
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if (files.length === 0) {
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console.log('ℹ️ Keine Dateien zum Komprimieren gefunden.');
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return;
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}
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// Komprimiere alle Dateien parallel (aber begrenzt)
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console.log('📦 Komprimiere Dateien...');
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const BATCH_SIZE = 10; // Maximale parallele Verarbeitung
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let totalOriginalSize = 0;
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let totalCompressedSize = 0;
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let processedFiles = 0;
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for (let i = 0; i < files.length; i += BATCH_SIZE) {
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const batch = files.slice(i, i + BATCH_SIZE);
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const promises = batch.map(async (file) => {
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try {
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const stats = await stat(file);
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if (stats.size >= MIN_SIZE_FOR_COMPRESSION) {
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const data = await readFile(file);
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const compressed = await gzip(data, { level: COMPRESSION_LEVEL });
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await writeFile(file + '.gz', compressed);
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totalOriginalSize += stats.size;
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totalCompressedSize += compressed.length;
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processedFiles++;
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return {
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file: path.basename(file),
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original: stats.size,
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compressed: compressed.length
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};
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}
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} catch (error) {
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console.error(`❌ ${path.basename(file)}: ${error.message}`);
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return null;
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}
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});
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const results = await Promise.all(promises);
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// Zeige Fortschritt für diese Batch
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results.filter(r => r).forEach(result => {
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const ratio = ((result.original - result.compressed) / result.original * 100).toFixed(1);
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console.log(`✅ ${result.file}: ${formatBytes(result.original)} → ${formatBytes(result.compressed)} (-${ratio}%)`);
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});
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}
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const endTime = Date.now();
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const duration = ((endTime - startTime) / 1000).toFixed(2);
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console.log('\n🎉 Komprimierung abgeschlossen!');
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console.log(`📊 Statistiken:`);
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console.log(` • Verarbeitete Dateien: ${processedFiles}`);
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console.log(` • Originalgröße: ${formatBytes(totalOriginalSize)}`);
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console.log(` • Komprimierte Größe: ${formatBytes(totalCompressedSize)}`);
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if (totalOriginalSize > 0) {
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const totalSavings = ((totalOriginalSize - totalCompressedSize) / totalOriginalSize * 100).toFixed(1);
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console.log(` • Gesamt-Einsparung: ${formatBytes(totalOriginalSize - totalCompressedSize)} (-${totalSavings}%)`);
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}
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console.log(` • Dauer: ${duration}s`);
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console.log('\n💡 Tipp: Verwenden Sie gzip-komprimierte Dateien mit Flask-Compress für optimale Performance!');
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}
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// Führe Skript nur aus wenn direkt aufgerufen
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if (require.main === module) {
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main().catch(error => {
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console.error('💥 Kritischer Fehler:', error);
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process.exit(1);
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});
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}
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module.exports = { compressFile, findCompressibleFiles, cleanupOldGzFiles };
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