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544 lines (475 loc) · 14.2 KB
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/**
* Advanced Service Worker for Engineering Blog
* Caching strategies, offline support, and performance optimization
*/
const CACHE_VERSION = '2.0.0';
const CACHE_NAME = `engineering-blog-${CACHE_VERSION}`;
const STATIC_CACHE = `static-${CACHE_VERSION}`;
const CONTENT_CACHE = `content-${CACHE_VERSION}`;
const IMAGE_CACHE = `images-${CACHE_VERSION}`;
const FONT_CACHE = `fonts-${CACHE_VERSION}`;
// Cache durations (in seconds)
const CACHE_DURATIONS = {
static: 30 * 24 * 60 * 60, // 30 days
content: 24 * 60 * 60, // 1 day
images: 7 * 24 * 60 * 60, // 7 days
fonts: 30 * 24 * 60 * 60 // 30 days
};
// Resources to cache immediately on install
const STATIC_ASSETS = [
'/',
'/css/main.css',
'/css/critical.css',
'/js/main.js',
'/js/i18n.js',
'/js/interactive.js',
'/js/search.js',
'/js/images.js',
'/assets/i18n/en.json',
'/assets/i18n/ru.json',
'/favicon.ico',
'/favicon.svg',
'/manifest.json'
];
// Font assets for separate caching
const FONT_ASSETS = [
'/assets/fonts/inter-variable.woff2',
'/assets/fonts/jetbrains-mono-variable.woff2'
];
// Network patterns
const NETWORK_PATTERNS = {
static: /\.(css|js|json|ico|svg|woff2?)(\?.*)?$/,
images: /\.(jpg|jpeg|png|gif|webp|avif)(\?.*)?$/,
fonts: /\.(woff|woff2|ttf|eot)(\?.*)?$/
};
// Паттерны для кэширования контента
const CONTENT_PATTERNS = [
/^\/$/,
/^\/about\/?$/,
/^\/archive\/?$/,
/^\/categories\//,
/^\/tags\//,
/^\/feed\.xml$/,
/^\/assets\//
];
// Событие установки SW
self.addEventListener('install', (event) => {
console.log('SW: Installing');
event.waitUntil(
caches.open(STATIC_CACHE)
.then((cache) => {
console.log('SW: Caching static assets');
return cache.addAll(STATIC_ASSETS);
})
.then(() => {
console.log('SW: Static assets cached');
return self.skipWaiting();
})
.catch((error) => {
console.error('SW: Failed to cache static assets:', error);
})
);
});
// Событие активации SW
self.addEventListener('activate', (event) => {
console.log('SW: Activating');
event.waitUntil(
caches.keys()
.then((cacheNames) => {
return Promise.all(
cacheNames.map((cacheName) => {
// Удалить старые кэши
if (cacheName !== STATIC_CACHE &&
cacheName !== CONTENT_CACHE &&
cacheName !== CACHE_NAME) {
console.log('SW: Deleting old cache:', cacheName);
return caches.delete(cacheName);
}
})
);
})
.then(() => {
console.log('SW: Old caches deleted');
return self.clients.claim();
})
.catch((error) => {
console.error('SW: Failed to activate:', error);
})
);
});
// Событие перехвата запросов
self.addEventListener('fetch', (event) => {
const { request } = event;
const url = new URL(request.url);
// Пропускаем non-GET запросы
if (request.method !== 'GET') {
return;
}
// Пропускаем chrome-extension и другие протоколы
if (!url.protocol.startsWith('http')) {
return;
}
event.respondWith(handleRequest(request));
});
/**
* Advanced request handling with multiple caching strategies
*/
async function handleRequest(request) {
const url = new URL(request.url);
const strategy = getCacheStrategy(url.pathname, request);
try {
switch (strategy) {
case 'networkFirst':
return await networkFirst(request, url);
case 'staleWhileRevalidate':
return await staleWhileRevalidate(request, url);
case 'cacheFirst':
return await cacheFirst(request, url);
case 'networkOnly':
return await networkOnly(request);
default:
return await staleWhileRevalidate(request, url);
}
} catch (error) {
console.error('SW: Request failed:', error);
return getFallbackResponse(request);
}
}
/**
* Network First Strategy - for dynamic content
*/
async function networkFirst(request, url) {
try {
const networkResponse = await fetchWithTimeout(request);
// Cache successful network responses
if (shouldCache(url.pathname, networkResponse)) {
const cache = await getCacheForUrl(url.pathname);
cache.put(request, networkResponse.clone());
}
return networkResponse;
} catch (error) {
// Fallback to cache
const cachedResponse = await caches.match(request);
return cachedResponse || getNetworkError();
}
}
/**
* Cache First Strategy - for static assets
*/
async function cacheFirst(request, url) {
const cachedResponse = await caches.match(request);
if (cachedResponse) {
// Update in background if stale
const isStale = await isCacheStale(cachedResponse, url.pathname);
if (isStale) {
updateCacheInBackground(request);
}
return cachedResponse;
}
// Fallback to network
const networkResponse = await fetchWithTimeout(request);
if (shouldCache(url.pathname, networkResponse)) {
const cache = await getCacheForUrl(url.pathname);
cache.put(request, networkResponse.clone());
}
return networkResponse;
}
/**
* Stale While Revalidate Strategy - balanced approach
*/
async function staleWhileRevalidate(request, url) {
const cache = await getCacheForUrl(url.pathname);
const [cachedResponse] = await Promise.all([
cache.match(request),
fetchWithTimeout(request)
]);
// Return cached version immediately if available
if (cachedResponse) {
// Update cache in background
updateCacheInBackground(request);
return cachedResponse;
}
// Return network response and cache it
if (cachedResponse) {
const cache = await getCacheForUrl(url.pathname);
cache.put(request, cachedResponse.clone());
}
return cachedResponse;
}
/**
* Network Only Strategy - for always-fresh content
*/
async function networkOnly(request) {
return await fetchWithTimeout(request);
}
/**
* Determine appropriate cache based on URL pattern
*/
async function getCacheForUrl(pathname) {
if (NETWORK_PATTERNS.fonts.test(pathname)) {
return caches.open(FONT_CACHE);
} else if (NETWORK_PATTERNS.images.test(pathname)) {
return caches.open(IMAGE_CACHE);
} else if (NETWORK_PATTERNS.static.test(pathname)) {
return caches.open(STATIC_CACHE);
} else if (shouldCacheContent(pathname)) {
return caches.open(CONTENT_CACHE);
} else {
return caches.open(CACHE_NAME);
}
}
/**
* Determine cache strategy based on URL and request
*/
function getCacheStrategy(pathname, request) {
// Network first for dynamic content
if (pathname.includes('/search') ||
pathname.includes('/api/') ||
request.method !== 'GET') {
return 'networkFirst';
}
// Cache first for static assets
if (NETWORK_PATTERNS.static.test(pathname) ||
NETWORK_PATTERNS.fonts.test(pathname)) {
return 'cacheFirst';
}
// Network only for critical updates
if (pathname.includes('/feed.xml') ||
pathname.includes('/sitemap.xml')) {
return 'networkOnly';
}
// Default to stale while revalidate
return 'staleWhileRevalidate';
}
/**
* Check if cached response is stale
*/
async function isCacheStale(response, pathname) {
if (!response || !response.headers) return false;
const cacheTime = response.headers.get('sw-cache-time');
if (!cacheTime) return false;
const age = Date.now() - parseInt(cacheTime);
const maxAge = CACHE_DURATIONS[getCacheType(pathname)] * 1000;
return age > maxAge;
}
/**
* Get cache type for URL
*/
function getCacheType(pathname) {
if (NETWORK_PATTERNS.fonts.test(pathname)) return 'fonts';
if (NETWORK_PATTERNS.images.test(pathname)) return 'images';
if (NETWORK_PATTERNS.static.test(pathname)) return 'static';
return 'content';
}
/**
* Проверить нужно ли кэшировать контент
*/
function shouldCacheContent(pathname) {
return CONTENT_PATTERNS.some(pattern => pattern.test(pathname));
}
/**
* Проверить является ли ресурс статическим
*/
function isStaticAsset(pathname) {
return /\.(css|js|json|ico|svg|png|jpg|jpeg|gif|webp|woff|woff2)$/i.test(pathname);
}
/**
* Проверить нужно ли кэшировать ответ
*/
function shouldCache(pathname, response) {
// Не кэшировать ошибки
if (!response.ok) return false;
// Всегда кэшировать статические ресурсы
if (isStaticAsset(pathname)) return true;
// Кэшировать контентные страницы
if (shouldCacheContent(pathname)) return true;
return false;
}
/**
* Проверить нужно ли обновлять в фоне
*/
function shouldUpdateInBackground(pathname) {
// Обновлять в фоне только контентные страницы
return shouldCacheContent(pathname) && !isStaticAsset(pathname);
}
/**
* Обновление кэша в фоне
*/
function updateCacheInBackground(request) {
fetch(request)
.then(response => {
if (response.ok) {
const url = new URL(request.url);
getCacheForUrl(url.pathname)
.then(cache => cache.put(request, response));
}
})
.catch(error => {
console.log('SW: Background update failed:', error);
});
}
/**
* Fetch с таймаутом
*/
function fetchWithTimeout(request, timeout = 5000) {
return Promise.race([
fetch(request),
new Promise((_, reject) =>
setTimeout(() => reject(new Error('Timeout')), timeout)
)
]);
}
/**
* Fallback ответ при ошибках сети
*/
async function getFallbackResponse(request) {
const url = new URL(request.url);
// Для HTML страниц вернуть офлайн страницу
if (request.headers.get('accept')?.includes('text/html')) {
return caches.match('/offline.html') || createOfflineResponse();
}
// Для изображений вернуть placeholder
if (request.headers.get('accept')?.includes('image/')) {
return createImagePlaceholder();
}
// Для других запросов вернуть ошибку
return new Response('Service Unavailable', {
status: 503,
statusText: 'Service Unavailable'
});
}
/**
* Создать офлайн ответ
*/
function createOfflineResponse() {
const html = `
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Offline - Engineering Blog</title>
<style>
body {
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
display: flex;
align-items: center;
justify-content: center;
min-height: 100vh;
margin: 0;
background: #f7fafc;
color: #2d3748;
text-align: center;
}
.container {
max-width: 400px;
padding: 2rem;
}
h1 { color: #4158D0; margin-bottom: 1rem; }
p { margin-bottom: 1.5rem; line-height: 1.6; }
.btn {
display: inline-block;
padding: 0.75rem 1.5rem;
background: #4158D0;
color: white;
text-decoration: none;
border-radius: 8px;
transition: background 0.2s;
}
.btn:hover { background: #2c3e8f; }
.icon { font-size: 4rem; margin-bottom: 1rem; }
</style>
</head>
<body>
<div class="container">
<div class="icon">📡</div>
<h1>You're Offline</h1>
<p>It seems you've lost your internet connection. Some content may still be available from cache.</p>
<a href="/" class="btn">Try Again</a>
</div>
</body>
</html>
`;
return new Response(html, {
headers: {
'Content-Type': 'text/html',
'Cache-Control': 'no-cache'
}
});
}
/**
* Создать плейсхолдер для изображений
*/
function createImagePlaceholder() {
const svg = `
<svg width="200" height="200" xmlns="http://www.w3.org/2000/svg">
<rect width="100%" height="100%" fill="#f0f0f0"/>
<text x="50%" y="50%" text-anchor="middle" dy="0.3em"
font-family="Arial, sans-serif" font-size="14" fill="#999">
Image unavailable
</text>
</svg>
`;
return new Response(svg, {
headers: {
'Content-Type': 'image/svg+xml',
'Cache-Control': 'no-cache'
}
});
}
// Обработка сообщений от клиента
self.addEventListener('message', (event) => {
if (event.data && event.data.type === 'SKIP_WAITING') {
self.skipWaiting();
}
if (event.data && event.data.type === 'GET_VERSION') {
event.ports[0].postMessage({ version: CACHE_NAME });
}
if (event.data && event.data.type === 'CLEAR_CACHE') {
clearAllCaches()
.then(() => {
event.ports[0].postMessage({ success: true });
})
.catch(error => {
event.ports[0].postMessage({ success: false, error: error.message });
});
}
});
/**
* Очистка всех кэшей
*/
async function clearAllCaches() {
const cacheNames = await caches.keys();
await Promise.all(cacheNames.map(name => caches.delete(name)));
console.log('SW: All caches cleared');
}
// Периодическая очистка старых кэшей
self.addEventListener('periodicsync', (event) => {
if (event.tag === 'cache-cleanup') {
event.waitUntil(cleanupOldCache());
}
});
/**
* Очистка старого кэша
*/
async function cleanupOldCache() {
try {
const cache = await caches.open(CONTENT_CACHE);
const requests = await cache.keys();
const now = Date.now();
const maxAge = 7 * 24 * 60 * 60 * 1000; // 7 дней
for (const request of requests) {
const response = await cache.match(request);
const dateHeader = response?.headers.get('date');
if (dateHeader) {
const responseDate = new Date(dateHeader).getTime();
if (now - responseDate > maxAge) {
await cache.delete(request);
}
}
}
console.log('SW: Old cache cleaned up');
} catch (error) {
console.error('SW: Cache cleanup failed:', error);
}
}