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      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     webkitStorageInfo.queryUsageAndQuota(webkitStorageInfo.TEMPORARY,
      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   webkitStorageInfo.queryUsageAndQuota(webkitStorageInfo.TEMPORARY,
     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.errorCode + ") " +
     98         event.target.webkitErrorMessage);
     99   event.preventDefault();
    100 }
    101 
    102