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const CACHE_PREFIX = 'epube';
const CACHE_NAME = CACHE_PREFIX + '-v3';
self.addEventListener('activate', function(event) {
event.waitUntil(
caches.keys().then(function(keyList) {
return Promise.all(keyList.map((key) => {
if (key.indexOf(CACHE_PREFIX) != -1 && key != CACHE_NAME) {
return caches.delete(key);
}
return false;
}));
})
);
});
function send_message(client, msg) {
return client.postMessage(msg);
}
function send_broadcast(msg) {
return self.clients.matchAll().then((clients) => {
clients.forEach((client) => {
send_message(client, msg);
})
})
}
self.addEventListener('message', async (event) => {
console.log('[worker] got message', event.data);
if (event.data.msg == 'refresh-cache') {
console.log("[worker] refreshing cache...");
await send_broadcast('refresh-started');
const cache = await caches.open(CACHE_NAME);
await Promise.all(event.data.urls.map(async (url) => {
const resp = await fetch(url + "?ts=" + Date.now());
send_broadcast('refreshed:' + resp.url);
if (resp.ok) {
console.log('[worker] refresh complete for', resp.url);
return cache.put(url, resp);
} else if (resp.status == 404) {
console.log('[worker] removing obsolete file', resp.url);
return cache.delete(url);
}
}));
console.log('[worker] refresh finished');
await send_broadcast('refresh-finished');
}
});
this.addEventListener('fetch', (event) => {
if (event.request.url.match('/assets/'))
return;
event.respondWith(caches.match(event.request).then((resp) => {
if (resp) {
console.log('[worker] cache hit for', event.request.url);
return resp;
} else {
console.log('[worker] cache miss for', event.request.url);
return fetch(event.request.clone())
.then((resp) => {
if (resp.ok && resp.url.match("backend.php\\?op=(cover|getinfo)")) {
return caches.open(CACHE_NAME).then((cache) => {
console.log('[worker] caching response', resp.url);
cache.put(resp.url, resp.clone());
return resp;
});
} else {
return resp;
}
})
.catch((err) => {
console.warn('[worker] fetch request failed', event.request.url, err);
if (event.request.url[event.request.url.length-1] == "/" || event.request.url.match("index.php|offline.html")) {
return caches.match("offline.html");
} else if (event.request.url.match("read.html")) {
return caches.match("read.html");
} else {
console.error('[worker] no fetch fallback for ', event.request.url);
}
}
);
}
})
);
});
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