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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| /** | ||
| * ServiceWorker for the CometVisu | ||
| * | ||
| * @author Tobias Bräutigam | ||
| * @since (0.11.0) 2017 | ||
| */ | ||
|
|
||
| var CACHE = "cv-cache-v2"; | ||
| var NO_CACHE_TEST = /.+\.php$/i; | ||
| var CONFIG_TEST = /.+visu_config.*\.xml.*/i; | ||
| var config = {}; | ||
| var updateQueue = []; | ||
| var queueTid = null; | ||
| let startTime = 0; | ||
| const logPrefix = 'cv.ServiceWorker:'; | ||
| const logStyling = 'color: #0044b2;'; | ||
|
|
||
| const logger = { | ||
| log: function () { | ||
| console.log.apply(console, this._generateArgs(arguments)); | ||
| }, | ||
|
|
||
| debug: function () { | ||
| if (config.debug === true) { | ||
| console.debug.apply(console, this._generateArgs(arguments)); | ||
| } | ||
| }, | ||
|
|
||
| _generateArgs(argsIn) { | ||
| let args = Array.prototype.slice.call(argsIn); | ||
| let message = this._getPrefix(); | ||
| let params = [logStyling]; | ||
| // apply the style prefix | ||
| args.forEach(msg => { | ||
| switch (typeof msg) { | ||
| case 'object': | ||
| message += ' %o'; | ||
| params.push(msg); | ||
| break; | ||
| default: | ||
| message += ' ' + msg; | ||
| break; | ||
| } | ||
| }); | ||
| params.unshift(message); | ||
| return params; | ||
| }, | ||
|
|
||
| _getPrefix() { | ||
| return '%c' + (Date.now() - startTime).toString().padStart(6, '0') + ' ' +logPrefix; | ||
| } | ||
| }; | ||
|
|
||
| function fromNetwork(request, timeout) { | ||
| return new Promise(function (resolve, reject) { | ||
| if (timeout) { | ||
| var timeoutId = setTimeout(reject, timeout); | ||
| } | ||
|
|
||
| fetch(request).then(function (response) { | ||
| if (timeoutId) { | ||
| clearTimeout(timeoutId); | ||
| } | ||
| resolve(response); | ||
| }, reject); | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Fetch request from network and update the cache | ||
| * @param request {Request} | ||
| * @return {Promise} | ||
| */ | ||
| function update(request) { | ||
| caches.open(CACHE).then(function (cache) { | ||
| fetch(request).then(function (response) { | ||
| if (response.status < 400) { | ||
| cache.put(request, response); | ||
| } | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| function processQueue() { | ||
| while (updateQueue.length) { | ||
| var request = updateQueue.shift(); | ||
| update(request); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Get response from cache | ||
| * @param request {Request} | ||
| * @return {Response} | ||
| */ | ||
| function fromCache(request) { | ||
| return caches.open(CACHE).then(function (cache) { | ||
| return cache.match(request).then(function (matching) { | ||
| return matching || Promise.reject('no-match'); | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Fetch request from network, update the cache and return the response | ||
| * @param request {Request} | ||
| * @return {Response} | ||
| */ | ||
| function fetchAndUpdate(request) { | ||
| return caches.open(CACHE).then(function (cache) { | ||
| return fetch(request).then(function (response) { | ||
| if (response.status < 400) { | ||
| cache.put(request, response.clone()); | ||
| } | ||
| return response; | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| self.addEventListener('message', function (event) { | ||
| var data = event.data; | ||
|
|
||
| if (data.command === "configure") { | ||
| config = data.message; | ||
| logger.debug('Configuration:', config); | ||
| } | ||
| }); | ||
|
|
||
| self.addEventListener('install', function () { | ||
| startTime = Date.now(); | ||
| // take over right now | ||
| logger.log("CometVisu service worker installed"); | ||
| }); | ||
|
|
||
| // delete old caches after activation | ||
| self.addEventListener('activate', function (event) { | ||
| logger.log("CometVisu service worker activated"); | ||
| var cacheWhitelist = [CACHE]; | ||
| event.waitUntil( | ||
| caches.keys().then(function(cacheNames) { | ||
| return Promise.all( | ||
| cacheNames.map(function(cacheName) { | ||
| if (cacheWhitelist.indexOf(cacheName) === -1) { | ||
| return caches.delete(cacheName); | ||
| } | ||
| }) | ||
| ); | ||
| }) | ||
| ); | ||
| }); | ||
|
|
||
| self.addEventListener('fetch', function(ev) { | ||
| if (config.disableCache === true || | ||
| !ev.request.url.startsWith(this.registration.scope) || | ||
| CONFIG_TEST.test(ev.request.url) | ||
| ) { | ||
| // fallback to "normal" behaviour without serviceWorker -> sends HTTP request | ||
| logger.debug("ignore cache for " + ev.request.url); | ||
| return; | ||
| } | ||
|
|
||
| if (!NO_CACHE_TEST.test(ev.request.url) && | ||
| (!ev.request.headers.pragma || ev.request.headers.pragma !== "no-cache") && | ||
| (!ev.request.headers['Cache-Control'] || ev.request.headers['Cache-Control'] !== "no-cache") | ||
| ) { | ||
|
|
||
| ev.respondWith(fromCache(ev.request).then(function(response){ | ||
| logger.debug('load from cache ' + ev.request.url); | ||
| if (config.forceReload === true) { | ||
| update(ev.request); | ||
| } else { | ||
| updateQueue.push(ev.request); | ||
| if (queueTid) { | ||
| clearTimeout(queueTid); | ||
| } | ||
| queueTid = setTimeout(processQueue, 1000); | ||
| } | ||
|
|
||
| return response; | ||
| }).catch(function () { | ||
| // not cached -> do now | ||
| logger.debug("caching " + ev.request.url); | ||
| return fetchAndUpdate(ev.request); | ||
| })); | ||
| } else { | ||
| logger.debug('load from network ' + ev.request.url); | ||
| ev.respondWith(fromNetwork(ev.request)); | ||
| } | ||
| }); |
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