content/test/data/indexeddb/blobs_use_quota.html

   1 <!DOCTYPE html>
   2 <html>
   3 <!--
   4   Copyright 2014 The Chromium Authors. All rights reserved.
   5   Use of this source code is governed by a BSD-style license that can be
   6   found in the LICENSE file.
   7 -->
   8 <head>
   9 <title>IDB Test that blobs use space when created and free up space when deleted</title>
  10 <script src="common.js"></script>
  11 <script>
  12
  13 // Constants.
  14 var store_name = 'blobs_use_space';
  15 var blob_key = 'blob_key';
  16 var blob_size = 20 * 1024 * 1024;
  17
  18 // Shared variables.
  19 var db;
  20 var size_initial;
  21 var size_after_write;
  22
  23 function test() {
  24   indexedDBTest(prepareDatabase, getInitialSize);
  25 }
  26
  27 function prepareDatabase() {
  28   db = event.target.result;
  29   db.createObjectStore(store_name);
  30 }
  31
  32 function getInitialSize() {
  33   getUsage(function(usage) {
  34     size_initial = usage;
  35     putBlob();
  36   });
  37 }
  38
  39 function putBlob() {
  40   debug("Writing blob.");
  41
  42   var trans = db.transaction(store_name, 'readwrite');
  43   trans.onabort = unexpectedAbortCallback;
  44   trans.oncomplete = checkSizeIncreased;
  45
  46   var data = new Array(1 + blob_size).join("X");
  47   var blob = new Blob([data]);
  48   var request = trans.objectStore(store_name).put(blob, blob_key);
  49   request.onerror = unexpectedErrorCallback;
  50 }
  51
  52 function checkSizeIncreased() {
  53   getUsage(function(usage) {
  54     if (usage < size_initial + blob_size)
  55       fail("Size increased by only " + (usage - size_initial) +
  56            " after writing 20MB blob");
  57     size_after_write = usage;
  58     deleteBlob();
  59   });
  60 }
  61
  62 function deleteBlob() {
  63   debug("Deleting blob.");
  64   var trans = db.transaction(store_name, 'readwrite');
  65   trans.onabort = unexpectedAbortCallback;
  66   trans.oncomplete = checkSizeBackToInitial;
  67
  68   var request = trans.objectStore(store_name).delete(blob_key);
  69   request.onerror = unexpectedErrorCallback;
  70 }
  71
  72 function checkSizeBackToInitial() {
  73   getUsage(function(usage) {
  74     if (usage < size_after_write) {
  75       done();
  76     } else {
  77       fail("Size after deleting blob is " + (usage - size_after_write) +
  78            " higher than size after write");
  79     }
  80   });
  81 }
  82
  83 function getUsage(cb) {
  84   webkitStorageInfo.queryUsageAndQuota(
  85       webkitStorageInfo.TEMPORARY,
  86       function(usage, quota) {
  87         debug("Current database size is " + usage + "B");
  88         cb(usage);
  89       },
  90       unexpectedErrorCallback);
  91 }
  92
  93 function displaySize(bytes) {
  94   var k = bytes / 1024;
  95   var m = k / 1024;
  96   return bytes + " (" + k + "k) (" + m + "m)";
  97 }
  98
  99 </script>
 100 </head>
 101 <body onLoad="test()">
 102   <div id="status">Starting...<br></div>
 103 </body>
 104 </html>