test_file_repeated_add_delete.html

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<html>

<head>

  <title>Indexed Database Blob Add/Delete Stress Test</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

  <script type="text/javascript">

/*

   * This is a stress test which rapidly adds and deletes blobs in a row in

   * separate transactions. Internally, blobs are only removed when all memory

   * and database references drop to zero. At that point an asynchronous

   * delete operation is scheduled which removes the backing file from disk.

   * So the overall behavior and timing depends on cycle collection and

   * garbage collection. The main goal of this test is to make it more likely

   * that internal structures are accessed by multiple threads at the same

   * time, potentially discovering races or other issues.

   * Note that the test needs to always create a new blob and a new

   * transaction, otherwise new backing files wouldn't be created due to

   * internal optimizations for de-duplication.

*/

  function* testSteps()

    const READ_WRITE = "readwrite";

    const name = window.location.pathname;

    const objectStoreName = "Blobs";

      const request = indexedDB.open(name, 1);

      request.onerror = errorHandler;

      request.onupgradeneeded = grabEventAndContinueHandler;

      request.onsuccess = grabEventAndContinueHandler;

      const event = yield undefined;

      is(event.type, "upgradeneeded", "Got correct event type");

      const db = event.target.result;

      db.onerror = errorHandler;

      const objectStore = db.createObjectStore(objectStoreName, {});

      objectStore.add(getRandomBlob(1), 1);

      const event = yield undefined;

      is(event.type, "success", "Got correct event type");

      const db = event.target.result;

      db.onerror = errorHandler;

      let index = 1;

      function doWork() {

        const transaction = db.transaction([objectStoreName], READ_WRITE);

        const objectStore = transaction.objectStore(objectStoreName);

        const deleteRequest = objectStore.delete(index);

        deleteRequest.onsuccess = function () {

          index++;

          const addRequest = objectStore.add(getRandomBlob(1), index);

          addRequest.onsuccess = function () {

            if (index < 1000) {

              doWork();

            } else {

              continueToNextStep();

};

};

      doWork();

      yield undefined;

    finishTest();

  </script>

  <script type="text/javascript" src="file.js"></script>

  <script type="text/javascript" src="helpers.js"></script>

</head>

<body onload="runTest();"></body>

</html>