Fix service worker cache, handle refresh better
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0827a1ec31
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C1980A470C3EE5B1
2 changed files with 240 additions and 106 deletions
292
sw.js
292
sw.js
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@ -1,129 +1,221 @@
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const VERSION = 'v14'
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const VERSION = 'v15'
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const API_ORIGIN = 'https://scraper.infotren.dcdev.ro/'
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const API_TRAINS = `${API_ORIGIN}v3/trains`
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const API_STATIONS = `${API_ORIGIN}v3/stations`
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const CACHE_FIRST = [
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// Root
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'/',
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// Utility JS
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'/common/worker.js',
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'/common/items.js',
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'/common/back.js',
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'/common/tabs.js',
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// Base
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'/base.css',
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// Pages
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'/index.html',
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'/about.html',
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'/train.html',
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'/train.js',
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'/view-train.html',
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'/view-train.js',
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'/view-train.css',
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'/station.html',
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'/station.js',
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'/view-station.html',
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'/view-station.js',
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'/view-station.css',
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// API
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API_TRAINS,
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API_STATIONS,
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];
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/**
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* @param {string} url
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* @returns {boolean}
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*/
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function shouldReturnFromCacheFirst(url) {
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return CACHE_FIRST.map(u => u.includes('://') ? u : self.location.origin + u).includes(url.split('?')[0])
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}
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self.addEventListener('install', (event) => {
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event.waitUntil(
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caches
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.open(VERSION)
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.then((cache) =>
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cache.addAll([
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// Root
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'/',
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// Utility JS
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'/common/worker.js',
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'/common/items.js',
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'/common/back.js',
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'/common/tabs.js',
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// Base
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'/base.css',
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// Pages
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'/index.html',
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'/about.html',
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'/train.html',
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'/train.js',
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'/view-train.html',
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'/view-train.js',
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'/view-train.css',
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'/station.html',
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'/station.js',
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'/view-station.html',
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'/view-station.js',
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'/view-station.css',
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// API
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API_TRAINS,
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API_STATIONS,
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])
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)
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)
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event.waitUntil(
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caches
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.open(VERSION)
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.then((cache) =>
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cache.addAll(CACHE_FIRST)
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)
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)
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})
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const deleteCache = (/** @type {string} */ key) => caches.delete(key)
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const deleteOldCaches = async () => {
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const cacheKeepList = [VERSION]
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const keyList = await caches.keys()
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const cachesToDelete = keyList.filter((key) => !cacheKeepList.includes(key))
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await Promise.all(cachesToDelete.map(deleteCache))
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const cacheKeepList = [VERSION]
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const keyList = await caches.keys()
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const cachesToDelete = keyList.filter((key) => !cacheKeepList.includes(key))
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await Promise.all(cachesToDelete.map(deleteCache))
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}
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// Enable navigation preload
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const enableNavigationPreload = async () => {
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if (self.registration.navigationPreload) {
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// Enable navigation preloads!
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await self.registration.navigationPreload.enable()
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}
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if (self.registration.navigationPreload) {
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// Enable navigation preloads!
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await self.registration.navigationPreload.enable()
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}
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}
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self.addEventListener('activate', (event) => {
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event.waitUntil(Promise.all([deleteOldCaches(), enableNavigationPreload()]))
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event.waitUntil(Promise.all([deleteOldCaches(), enableNavigationPreload()]))
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})
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/**
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* @param {RequestInfo | URL} request
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* @param {Response} response
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* @returns {Promise<void>}
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*/
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const putInCache = async (request, response) => {
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const cache = await caches.open(VERSION)
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await cache.put(request, response)
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const cache = await caches.open(VERSION)
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// try {
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// response.headers.set('SW-Cached-At', new Date().toISOString())
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// }
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// catch {
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const headers = new Headers(response.headers)
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headers.set('SW-Cached-At', new Date().toISOString())
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response = new Response(response.body, {
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status: response.status,
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statusText: response.statusText,
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headers,
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})
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// }
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await cache.put(request, response)
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}
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const cacheFirst = async ({ request, preloadResponsePromise, refreshAnyway }) => {
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// First try to get the resource from the cache
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const responseFromCache = await caches.match(request)
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if (responseFromCache) {
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if (refreshAnyway) {
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console.log('request in cache, refreshing anyway but returning cache', request);
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((async () => {
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try {
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const response = await fetch(request)
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if (response.ok) {
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putInCache(request, response)
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}
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}
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catch {}
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})())
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}
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return responseFromCache
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}
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// First try to get the resource from the cache
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const responseFromCache = await caches.match(request)
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if (responseFromCache) {
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if (refreshAnyway) {
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console.log('[cf] using cache response; refreshing anyway but returning cache', responseFromCache);
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((async () => {
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try {
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const response = await fetch(request)
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if (response.ok) {
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await putInCache(request, response)
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}
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}
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catch {}
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})())
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}
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else {
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console.log('[cf] using cache response', responseFromCache)
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}
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return responseFromCache
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}
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// Next try to use (and cache) the preloaded response, if it's there
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if (preloadResponsePromise) {
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const preloadResponse = await preloadResponsePromise
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if (preloadResponse && preloadResponse.ok) {
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console.info('using preload response', preloadResponse)
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putInCache(request, preloadResponse.clone())
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return preloadResponse
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}
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else {
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console.log('got not ok preloadResponse, ignoring', preloadResponse)
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}
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}
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// Next try to use (and cache) the preloaded response, if it's there
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if (preloadResponsePromise) {
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const preloadResponse = await preloadResponsePromise
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if (preloadResponse && preloadResponse.ok) {
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console.info('[cf] using preload response', preloadResponse)
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await putInCache(request, preloadResponse.clone())
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return preloadResponse
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}
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else {
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console.log('[cf] got not ok preloadResponse, ignoring', preloadResponse)
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}
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}
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// Next try to get the resource from the network
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const responseFromNetwork = await fetch(request)
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// response may be used only once
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// we need to save clone to put one copy in cache
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// and serve second one
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if (responseFromNetwork.ok) {
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putInCache(request, responseFromNetwork.clone())
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}
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return responseFromNetwork;
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// Next try to get the resource from the network
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const responseFromNetwork = await fetch(request)
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// response may be used only once
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// we need to save clone to put one copy in cache
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// and serve second one
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if (responseFromNetwork.ok) {
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console.log('[cf] using network response; ok so also cache', responseFromNetwork)
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await putInCache(request, responseFromNetwork.clone())
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}
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else {
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console.log('[cf] using network not ok response', responseFromNetwork)
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}
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return responseFromNetwork;
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}
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const networkFirst = async ({ request, preloadResponsePromise }) => {
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// First try to use (and cache) the preloaded response, if it's there
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if (preloadResponsePromise) {
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const preloadResponse = await preloadResponsePromise
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if (preloadResponse && preloadResponse.ok) {
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console.info('[nf] using preload response', preloadResponse)
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await putInCache(request, preloadResponse.clone())
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return preloadResponse
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}
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else {
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console.log('[nf] got not ok preloadResponse, ignoring', preloadResponse)
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}
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}
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// Next try to get the resource from the network
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let responseFromNetwork
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let errorFromNetwork
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try {
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responseFromNetwork = await fetch(request)
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}
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catch (e) {
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responseFromNetwork = null
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errorFromNetwork = e
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}
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// If the response is ok, put it in cache and respond
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if (responseFromNetwork && responseFromNetwork.ok) {
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console.log('[nf] using ok network response', responseFromNetwork)
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await putInCache(request, responseFromNetwork.clone())
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return responseFromNetwork
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}
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// Response from network wasn't ok, try to find in cache
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const responseFromCache = await caches.match(request)
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if (responseFromCache) {
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console.log('[nf] using cache response', responseFromCache)
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return responseFromCache
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}
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// If we didn't find a cached response, return the fresh network error
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if (responseFromNetwork) {
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console.log('[nf] using network not ok response', responseFromNetwork)
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return responseFromNetwork
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}
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else {
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console.log('[nf] throwing network error', errorFromNetwork)
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throw errorFromNetwork
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}
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}
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self.addEventListener('fetch', (event) => {
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event.respondWith(
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cacheFirst({
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request: event.request,
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preloadResponsePromise: event.preloadResponse,
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refreshAnyway: [API_STATIONS, API_TRAINS].includes(event.request.url.split('?')[0]),
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})
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)
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if (shouldReturnFromCacheFirst(event.request.url)) {
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event.respondWith(
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cacheFirst({
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request: event.request,
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preloadResponsePromise: event.preloadResponse,
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refreshAnyway: [API_STATIONS, API_TRAINS].includes(event.request.url.split('?')[0]),
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})
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)
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}
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else {
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event.respondWith(
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networkFirst({
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request: event.request,
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preloadResponsePromise: event.preloadResponse,
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})
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)
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}
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})
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@ -1,4 +1,10 @@
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/**
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* @type {string}
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*/
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var trainNumber
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/**
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* @type {Date}
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*/
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var date
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var groupIndex = null
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@ -6,6 +12,9 @@ var yesterday = false
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var showKm = false
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var trainData = null
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/**
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* @type {?Date}
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*/
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var lastSuccessfulFetch = null
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/**
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@ -55,8 +64,9 @@ var lastSuccessfulFetch = null
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/**
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* @param {{ rank: string; number: string; operator: string; date: string; groups: Group[]; }} data
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* @param {?Date} fetchDate
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*/
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function onTrainData(data) {
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function onTrainData(data, fetchDate) {
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var title = document.getElementById('title')
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title.textContent = ''
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title.appendChild(document.createTextNode('Train '))
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@ -384,10 +394,14 @@ function onTrainData(data) {
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}
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})
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lastSuccessfulFetch = new Date()
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lastSuccessfulFetch = fetchDate || new Date()
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}
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var refreshStopToken = null
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/**
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* @returns {Promise<boolean>}
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*/
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function refresh() {
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function reschedule(timeout) {
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if (refreshStopToken != null) {
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@ -415,14 +429,25 @@ function refresh() {
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reschedule(10000)
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return
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}
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return response.json()
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var cacheDate = response.headers.get('SW-Cached-At')
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return response.json().then(function (data) {
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data['$cacheDate'] = cacheDate
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return data
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})
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}).then(function (response) {
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if (!response) {
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return
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}
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var cacheDate = response['$cacheDate']
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if (cacheDate) {
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cacheDate = new Date(cacheDate)
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}
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var success = !cacheDate
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trainData = response
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onTrainData(response)
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reschedule()
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onTrainData(response, cacheDate)
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// Check in 1 seconds if network error
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reschedule(success ? undefined : 1000)
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return success
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}).catch(function (e) {
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// Check in 1 second if network error
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reschedule(1000)
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@ -437,7 +462,24 @@ window.addEventListener('unload', function (e) {
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})
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function rsk() {
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refresh()
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function changeRskText(newText) {
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document.querySelectorAll('.rsk').forEach(function (elem) {
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elem.textContent = newText
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})
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}
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changeRskText('Refreshing...')
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refresh().catch(function () { return false}).then(function (success) {
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if (!success) {
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changeRskText('Refreshing failed')
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setTimeout(function (_) {
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changeRskText('Refresh')
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}, 3000)
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}
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else {
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changeRskText('Refresh')
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}
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})
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}
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window.addEventListener('popstate', function (e) {
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