content/test/data/indexeddb/quota_test.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 function test() {
   6   if (window.webkitStorageInfo) {
   7     window.jsTestIsAsync = true;
   8     navigator.webkitTemporaryStorage.queryUsageAndQuota(
   9       initUsageCallback,
  10       unexpectedErrorCallback);
  11   } else
  12     debug("This test requires window.webkitStorageInfo.");
  13 }
  14
  15 function initUsageCallback(usage, quota) {
  16   origReturnedUsage = returnedUsage = usage;
  17   origReturnedQuota = returnedQuota = quota;
  18   debug("original quota is " + displaySize(origReturnedQuota));
  19   debug("original usage is " + displaySize(origReturnedUsage));
  20
  21   indexedDBTest(prepareDatabase, initQuotaEnforcing);
  22 }
  23
  24 function prepareDatabase()
  25 {
  26   db = event.target.result;
  27   objectStore = db.createObjectStore("test123");
  28 }
  29
  30 function displaySize(bytes) {
  31   var k = bytes / 1024;
  32   var m = k / 1024;
  33   return bytes + " (" + k + "k) (" + m + "m)";
  34 }
  35
  36 function initQuotaEnforcing() {
  37   var availableSpace = origReturnedQuota - origReturnedUsage;
  38   var kMaxMbPerWrite = 5;
  39   var kMinWrites = 5;
  40   var len = Math.min(kMaxMbPerWrite * 1024 * 1024,
  41                      Math.floor(availableSpace / kMinWrites));
  42   maxExpectedWrites = Math.floor(availableSpace / len) + 1;
  43   debug("Chunk size: " + displaySize(len));
  44   debug("Expecting at most " + maxExpectedWrites + " writes, but we could " +
  45         "have more if snappy is used or LevelDB is about to compact.");
  46   data = Array(1+len).join("X");
  47   dataLength = data.length;
  48   dataAdded = 0;
  49   successfulWrites = 0;
  50   startNewTransaction();
  51 }
  52
  53 function startNewTransaction() {
  54   if (dataAdded > origReturnedQuota) {
  55     fail("dataAdded > quota " + dataAdded + " > " + origReturnedQuota);
  56     return;
  57   }
  58   debug("");
  59   debug("Starting new transaction.");
  60
  61   var trans = db.transaction(['test123'], 'readwrite');
  62   trans.onabort = onAbort;
  63   trans.oncomplete = getQuotaAndUsage;
  64   var store = trans.objectStore('test123');
  65   request = store.put({x: data}, dataAdded);
  66   request.onerror = logError;
  67 }
  68
  69 function getQuotaAndUsage() {
  70   successfulWrites++;
  71   if (successfulWrites > maxExpectedWrites) {
  72     debug("Weird: too many writes. There were " + successfulWrites +
  73           " but we only expected " + maxExpectedWrites);
  74   }
  75   navigator.webkitTemporaryStorage.queryUsageAndQuota(
  76     usageCallback, unexpectedErrorCallback);
  77 }
  78
  79 function usageCallback(usage, quota) {
  80   debug("Transaction finished.");
  81   dataAdded += dataLength;
  82   debug("We've added "+ displaySize(dataAdded));
  83   returnedUsage = usage;
  84   returnedQuota = quota;
  85   debug("Allotted quota is " + displaySize(returnedQuota));
  86   debug("LevelDB usage is " + displaySize(returnedUsage));
  87   startNewTransaction();
  88 }
  89
  90 function onAbort() {
  91   shouldBeEqualToString("event.target.error.name", "QuotaExceededError");
  92   done("Transaction aborted. Data added: " + displaySize(dataAdded));
  93   debug("There were " + successfulWrites + " successful writes");
  94 }
  95
  96 function logError() {
  97   debug("Error function called: (" + event.target.error.name + ") " +
  98         event.target.error.message);
  99   event.preventDefault();
 100 }