1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
/*
Copyright 2014 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// While overkill for this specific sample in which there is only one cache,
// this is one best practice that can be followed in general to keep track of
// multiple caches used by a given service worker, and keep them all versioned.
// It maps a shorthand identifier for a cache to a specific, versioned cache name.
// Note that since global state is discarded in between service worker restarts, these
// variables will be reinitialized each time the service worker handles an event, and you
// should not attempt to change their values inside an event handler. (Treat them as constants.)
// If at any point you want to force pages that use this service worker to start using a fresh
// cache, then increment the CACHE_VERSION value. It will kick off the service worker update
// flow and the old cache(s) will be purged as part of the activate event handler when the
// updated service worker is activated.
var CACHE_SID = 0;
var CACHE_VER = '';
var isPlayerPage = false;
// var CURRENT_CACHES = {};
// var CURRENT_CACHES = null;
async function progressDownloader(urlOrRequest, port, sid) {
let url = urlOrRequest;
let response = await fetch(url);
if (urlOrRequest instanceof Request) {
url = urlOrRequest.url;
}
let isBin = false;
if (url.endsWith('.mp4')
|| url.endsWith('.mp3')
|| url.endsWith('.jpg')
|| url.endsWith('.png')){
isBin = true;
}
const reader = response.body.getReader();
const contentLength = +response.headers.get('Content-Length');
port.postMessage({
len: contentLength,
status: 'init',
sid
});
let receivedLength = 0;
let mb = 0;
let timeS = new Date().getTime();
let timeD = 0;
let speed = 0;
let chunks = []; // array of received binary chunks (comprises the body)
while(true) {
const {done, value} = await reader.read();
if (done) {
break;
}
chunks.push(value);
receivedLength += value.length;
/*mb += value.length;
if(mb > 1000 * 1000) {
timeD = new Date().getTime() - timeS;
// timeD = timeD /1000;
speed = mb / timeD;
mb = 0;
timeS = new Date().getTime();
}*/
// console.log(`Received ${receivedLength} of ${contentLength}`)
// cb && cb(receivedLength , contentLength)
port.postMessage({
loaded: value.length,
status: 'downloading',
sid
});
}
if (isBin) {
return new Blob(chunks);
} else {
let chunksAll = new Uint8Array(receivedLength);
let position = 0;
for(let chunk of chunks) {
chunksAll.set(chunk, position);
position += chunk.length;
}
return chunksAll; //new TextDecoder("utf-8").decode(chunksAll);
}
}
self.addEventListener('install', function(event) {
event.waitUntil(self.skipWaiting()); // Activate worker immediately
});
self.addEventListener('activate', function(event) {
event.waitUntil(self.clients.claim({
includeUncontrolled: true
}).then(function() {
// After the activation and claiming is complete, send a message to each of the controlled
// pages letting it know that it's active.
// This will trigger navigator.serviceWorker.onmessage in each client.
return self.clients.matchAll().then(function(clients) {
return Promise.all(clients.map(function(client) {
// return client.postMessage('The service worker has activated and ' +
// 'taken control.');
return client.postMessage({
name: 'initOk',
});
}));
});
})); // Become available to all pages
});
/*
self.addEventListener('activate', function(event) {
// Delete all caches that aren't named in CURRENT_CACHES.
// While there is only one cache in this example, the same logic will handle the case where
// there are multiple versioned caches.
// var expectedCacheNames = Object.keys(CURRENT_CACHES).map(function(key) {
// return CURRENT_CACHES[key];
// });
event.waitUntil(
caches.keys().then(function(cacheNames) {
// return Promise.all(
// cacheNames.map(function(cacheName) {
// if (expectedCacheNames.indexOf(cacheName) === -1) {
// // If this cache name isn't present in the array of "expected" cache names, then delete it.
// console.log('Deleting out of date cache:', cacheName);
// return caches.delete(cacheName);
// }
// })
// );
}).then(function() {
return clients.claim();
}).then(function() {
// After the activation and claiming is complete, send a message to each of the controlled
// pages letting it know that it's active.
// This will trigger navigator.serviceWorker.onmessage in each client.
return self.clients.matchAll().then(function(clients) {
return Promise.all(clients.map(function(client) {
return client.postMessage('The service worker has activated and ' +
'taken control.');
}));
});
})
);
});*/
self.addEventListener('message', function(event) {
// console.log('Handling message event:', event);
if (event.data.command === 'remove') {
if (!event.data.key) {
return;
}
caches.delete(event.data.key)
/*caches.keys().then(function(cacheNames) {
console.log('clear', cacheNames);
// return caches.delete(event.data.ver);
// CACHE_VER = event.data.newVer;
// CACHE_SID = event.data.sid;
if (!event.data.key) {
return;
}
return caches.delete(event.data.key);
return Promise.all(
cacheNames.map(function(cacheName) {
if ( cache_ver === cacheName) {
// If this cache name isn't present in the array of "expected" cache names, then delete it.
console.log('Deleting out of date cache:', cacheName);
// localStorage.removeItem('item-cache-'+event.data.sid);
// self.clients.matchAll().then(function(clients) {
// clients.forEach(function(client) {
// client.postMessage({
//
// });
// });
// });
console.log('delete', cacheName)
return caches.delete(cacheName);
}
})
);
})*/
/*.then(function() {
return clients.claim();
})*/
/*.then(function() {
// After the activation and claiming is complete, send a message to each of the controlled
// pages letting it know that it's active.
// This will trigger navigator.serviceWorker.onmessage in each client.
return self.clients.matchAll().then(function(clients) {
return Promise.all(clients.map(function(client) {
return client.postMessage('The service worker has activated and ' +
'taken control.');
}));
});
})*/
.then(function() {
console.log('delete finished')
event.ports[0].postMessage({
error: null
});
});
return;
}
if (event.data.command === 'clearAll') {
event.waitUntil(
caches.keys().then(function(cacheNames) {
return Promise.all(
cacheNames.map(function(cacheName) {
return caches.delete(cacheName);
})
);
}).then(function() {
event.ports[0].postMessage({
error: null
});
}).catch(err => {
event.ports[0].postMessage({
error: err,
});
})
);
return;
}
if (event.data.command === 'listCachedCoursewares') {
var cacheData = {}
// caches.open('item-cache-c965d3a0630911e994fa058136a96bb1-1556518161000').then(r=>{console.log(r.keys().then(items=>console.log(items[0])))})
caches.keys().then((cacheNames) => {
cacheNames.map((cacheName) => {
if (cacheName.indexOf('item-cache') > -1) {
var size = 0;
caches.open(cacheName).then((cache) => {
console.log(cacheName)
cache.keys().then((requests) => {
console.log(requests[0])
for(var req of requests) {
console.log(req)
cache.match(req.url).then(resp => {
console.log(resp.headers.entries())
})
// cache.match(req.url).then((resp) => {
// console.log(req.url, resp.length)
// size += parseInt(resp.headers['Content-Length'])
// }).catch(err => {
// console.log(err)
// });
}
}).then(() => {
cacheData.cacheName = size;
})
});
}
});
}).then(function(result) {
// event.ports[0].postMessage({
// error: null,
// urls: urls
// });
});
return;
}
// var key = 'item-cache-' + event.data.sid + '-'+ event.data.ver;
var key = event.data.key;
var p = caches.open(key).then(function(cache) {
// throw {name: 'QuotaExceededError'}
switch (event.data.command) {
// This command returns a list of the URLs corresponding to the Request objects
// that serve as keys for the current cache.
case 'keys':
return cache.keys().then(function(requests) {
var urls = requests.map(function(request) {
return request.url;
});
return urls.sort();
}).then(function(urls) {
// event.ports[0] corresponds to the MessagePort that was transferred as part of the controlled page's
// call to controller.postMessage(). Therefore, event.ports[0].postMessage() will trigger the onmessage
// handler from the controlled page.
// It's up to you how to structure the messages that you send back; this is just one example.
event.ports[0].postMessage({
error: null,
urls: urls
});
});
// This command adds a new request/response pair to the cache.
case 'add':
// If event.data.url isn't a valid URL, new Request() will throw a TypeError which will be handled
// by the outer .catch().
// Hardcode {mode: 'no-cors} since the default for new Requests constructed from strings is to require
// CORS, and we don't have any way of knowing whether an arbitrary URL that a user entered supports CORS.
var request = new Request(event.data.url, {mode: 'cors', cache: 'reload'}); // {mode: 'no-cors'}
// console.log('start', event.data.url);
// return fetch(request)
// .then(function(res){
// return res.arrayBuffer();
// })
const startTime = new Date().getTime();
let len = 0;
return progressDownloader(request, event.ports[0], event.data.sid).then((ab) => {
var cl = ab.size ? ab.size : ab.byteLength;
len = cl;
return cache.put(event.data.url, new Response(ab, {
// url: event.data.url,
// type: 'cors',
status: 200,
statusText: 'OK',
headers: [
['Content-Length', cl+''],
]
}));
}).then(function(r) {
event.ports[0].postMessage({
error: null,
status: 'finished',
len: len,
time: new Date().getTime() - startTime
});
});
// This command removes a request/response pair from the cache (assuming it exists).
case 'delete':
return cache.delete(event.data.url).then(function(success) {
event.ports[0].postMessage({
error: success ? null : 'Item was not found in the cache.'
});
});
default:
// This will be handled by the outer .catch().
throw Error('Unknown command: ' + event.data.command);
}
}).catch(function(error) {
// If the promise rejects, handle it by returning a standardized error message to the controlled page.
console.log('Message handling failed:', event.data.url, error);
// if (error.name == 'QuotaExceededError') {
event.ports[0].postMessage({
//error: {name: 'QuotaExceededError'}
error: {name: error.name, message: error.message},
status: 'error'
});
// }
});
// Beginning in Chrome 51, event is an ExtendableMessageEvent, which supports
// the waitUntil() method for extending the lifetime of the event handler
// until the promise is resolved.
if ('waitUntil' in event) {
event.waitUntil(p);
}
// Without support for waitUntil(), there's a chance that if the promise chain
// takes "too long" to execute, the service worker might be automatically
// stopped before it's complete.
});
self.addEventListener('fetch', function(event) {
// console.log('Handling fetch event for', event.request.method, event.request.url);
// if (event.request.method !== 'GET' || !CACHE_SID || !CACHE_VER) {
// event.respondWith(function(){
// return fetch(request).then(networkResponse => {
// return networkResponse;
// }).catch(_ => {
// console.error('direct Fetching failed:', error);
//
// throw error;
// })
// });
//
// return;
// }
/*if (!CACHE_SID || !CACHE_VER) {
event.request.mode = 'no-cors';
return fetch(event.request).then(function(response) {
// console.log('Response from network is:', response);
console.log(999)
return response;
}).catch(function(error) {
// This catch() will handle exceptions thrown from the fetch() operation.
// Note that a HTTP error response (e.g. 404) will NOT trigger an exception.
// It will return a normal response object that has the appropriate error code set.
console.error('Fetching failed 9:', error);
throw error;
});
}*/
// var isNormReq = !CACHE_SID || !CACHE_VER;
// var key = 'item-cache-' + CACHE_SID + '-'+ CACHE_VER;
if (event.request.method == 'GET' ) {
if (event.request.headers.get('range')) {
var pos =
Number(/^bytes\=(\d+)\-$/g.exec(event.request.headers.get('range'))[1]);
// console.log('Range request for', event.request.url,
// ', starting position:', pos);
event.respondWith(
caches.match(event.request.url, {
ignoreSearch: true,
ignoreVary: true
}).then(function(response) {
if (response) {
console.log('Found response in cache:', event.request.url);
return response.arrayBuffer().then(ab => {
return new Response(
ab.slice(pos),
{
status: 206,
statusText: 'Partial Content',
headers: [
['Content-Length', ab.byteLength+''],
['Content-Range', 'bytes ' + pos + '-' +
(ab.byteLength - 1) + '/' + ab.byteLength]]
});
});
// return response;
}
// event.request.mode = 'cors';
// event.request.cache = 'reload';
var request = new Request(event.request.url,
{
method: event.request.method,
mode: 'cors',
cache: 'reload',
headers: event.request.headers
});
return fetch(request).then(function(response) {
console.log('Response from network is:', event.request.url);
return response;
})/*.then(res => {
return res.arrayBuffer();
}).then(ab => {
return new Response(
ab.slice(pos),
{
status: 206,
statusText: 'Partial Content',
headers: [
['Content-Length', ab.byteLength+''],
['Content-Range', 'bytes ' + pos + '-' +
(ab.byteLength - 1) + '/' + (pos + ab.byteLength)]]
});
})*/
})
/*caches.open(key)
.then(function(cache) {
return cache.match(event.request.url);
}).then(function(res) {
if (!res) {
return fetch(event.request)
.then(res => {
return res.arrayBuffer();
});
}
return res.arrayBuffer();
}).then(function(ab) {
return new Response(
ab.slice(pos),
{
status: 206,
statusText: 'Partial Content',
headers: [
['Content-Length', ab.byteLength+''],
['Content-Range', 'bytes ' + pos + '-' +
(ab.byteLength - 1) + '/' + ab.byteLength]]
});
})*/
);
} else {
// console.log('Non-range request for', event.request.url);
event.respondWith(
// caches.match() will look for a cache entry in all of the caches available to the service worker.
// It's an alternative to first opening a specific named cache and then matching on that.
caches.match(event.request, {
ignoreSearch: true,
ignoreVary: true
}).then(function(response) {
if (response) {
// console.log('%c Response in cache:', 'color:DodgerBlue;', response);
return response;
}
// event.request will always have the proper mode set ('cors, 'no-cors', etc.) so we don't
// have to hardcode 'no-cors' like we do when fetch()ing in the install handler.
// event.request.mode = 'cors';
// cache: 'reload'
if (event.request.cache === 'only-if-cached' && event.request.mode !== 'same-origin') {
return;
}
// console.log('No response found in cache.', event.request.url);
return fetch(event.request).then(function(response) {
// console.log('%c Response from network is:', 'color:#bada55', response);
return response;
}).catch(function(error) {
// This catch() will handle exceptions thrown from the fetch() operation.
// Note that a HTTP error response (e.g. 404) will NOT trigger an exception.
// It will return a normal response object that has the appropriate error code set.
console.error('Fetching failed:', error);
// throw error;
});
})
);
}
} else {
event.respondWith(
fetch(event.request).then(function(response) {
// console.log('not get from network:', response);
// console.log(888)
return response;
}).catch(function(error) {
// This catch() will handle exceptions thrown from the fetch() operation.
// Note that a HTTP error response (e.g. 404) will NOT trigger an exception.
// It will return a normal response object that has the appropriate error code set.
console.error('Fetching failed 8:', error);
throw error;
})
);
}
});