dom/indexedDB/test/blob_worker_crash_iframe.html@7e26c7da4463
dom/indexedDB/test/blob_worker_crash_iframe.html
Wed, 31 Dec 2014 06:55:50 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:55:50 +0100
- changeset 2
- 7e26c7da4463
- permissions
- -rw-r--r--
Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2
1 <!--
2 Any copyright is dedicated to the Public Domain.
3 http://creativecommons.org/publicdomain/zero/1.0/
4 -->
5 <html>
6 <head>
7 <title>Indexed Database Test</title>
9 <script type="text/javascript">
10 function report(result) {
11 var message = { source: "iframe" };
12 message.result = result;
13 window.parent.postMessage(message, "*");
14 }
16 function runIndexedDBTest() {
17 var db = null;
19 // Create the data-store
20 function createDatastore() {
21 try {
22 var request = indexedDB.open(window.location.pathname, 1);
23 request.onupgradeneeded = function(event) {
24 event.target.result.createObjectStore("foo");
25 }
26 request.onsuccess = function(event) {
27 db = event.target.result;
28 createAndStoreBlob();
29 }
30 }
31 catch (e) {
32 dump("EXCEPTION IN CREATION: " + e + "\n " + e.stack + "\n");
33 report(false);
34 }
35 }
37 function createAndStoreBlob() {
38 const BLOB_DATA = ["fun ", "times ", "all ", "around!"];
39 var blob = new Blob(BLOB_DATA, { type: "text/plain" });
40 var objectStore = db.transaction("foo", "readwrite").objectStore("foo");
41 objectStore.add({ blob: blob }, 42).onsuccess = refetchBlob;
42 }
44 function refetchBlob() {
45 var foo = db.transaction("foo").objectStore("foo");
46 foo.get(42).onsuccess = fetchedBlobCreateWorkerAndSendBlob;
47 }
49 function fetchedBlobCreateWorkerAndSendBlob(event) {
50 var idbBlob = event.target.result.blob;
51 var compositeBlob = new Blob(['I like the following blob: ', idbBlob],
52 { type: "text/fancy" });
54 function workerScript() {
55 onmessage = function(event) {
56 // Save the Blob to the worker's global scope.
57 self.holdOntoBlob = event.data;
58 // Send any message so we can serialize and keep our runtime behaviour
59 // consistent.
60 postMessage('kung fu death grip established');
61 }
62 }
64 var url =
65 URL.createObjectURL(new Blob(["(", workerScript.toSource(), ")()"]));
67 // Keep a reference to the worker on the window.
68 var worker = window.worker = new Worker(url);
69 worker.postMessage(compositeBlob);
70 worker.onmessage = workerLatchedBlobDeleteFromDB;
71 }
73 function workerLatchedBlobDeleteFromDB() {
74 // Delete the reference to the Blob from the database leaving the worker
75 // thread reference as the only live reference once a GC has cleaned
76 // out our references that we sent to the worker. The page that owns
77 // us triggers a GC just for that reason.
78 var objectStore = db.transaction("foo", "readwrite").objectStore("foo");
79 objectStore.delete(42).onsuccess = closeDBTellOwningThread;
80 }
82 function closeDBTellOwningThread(event) {
83 // Now that worker has latched the blob, clean up the database.
84 db.close();
85 db = null;
86 report('ready');
87 }
89 createDatastore();
90 }
91 </script>
93 </head>
95 <body onload="runIndexedDBTest();">
96 </body>
98 </html>
