dom/indexedDB/test/test_blob_worker_xhr_read.html

<!--
  Any copyright is dedicated to the Public Domain.
  http://creativecommons.org/publicdomain/zero/1.0/
-->
<html>
<head>
  <title>Indexed Database Blob Read From Worker</title>

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

  <script type="text/javascript;version=1.7">
  /**
   * Create an IndexedDB-backed Blob, send it to the worker, try and read the
   * contents of the Blob from the worker using an XHR.  Ideally, we don't
   * deadlock the main thread.
   */
  function testSteps()
  {
    const BLOB_DATA = ["Green"];
    const BLOB_TYPE = "text/plain";
    const BLOB_SIZE = BLOB_DATA.join("").length;

    info("Setting up");

    let request = indexedDB.open(window.location.pathname, 1);
    request.onerror = errorHandler;
    request.onupgradeneeded = grabEventAndContinueHandler;
    request.onsuccess = unexpectedSuccessHandler;
    let event = yield undefined;

    let db = event.target.result;
    db.onerror = errorHandler;

    ok(db, "Created database");

    info("Creating objectStore");

    let objectStore = db.createObjectStore("foo", { autoIncrement: true });

    request.onupgradeneeded = unexpectedSuccessHandler;
    request.onsuccess = grabEventAndContinueHandler;
    event = yield undefined;

    ok(true, "Opened database");

    let blob = new Blob(BLOB_DATA, { type: BLOB_TYPE });

    info("Adding blob to database");

    objectStore = db.transaction("foo", "readwrite").objectStore("foo");
    objectStore.add(blob).onsuccess = grabEventAndContinueHandler;
    event = yield undefined;

    let blobKey = event.target.result;
    ok(blobKey, "Got a key for the blob");

    info("Getting blob from the database");

    objectStore = db.transaction("foo").objectStore("foo");
    objectStore.get(blobKey).onsuccess = grabEventAndContinueHandler;
    event = yield undefined;

    blob = event.target.result;

    ok(blob instanceof Blob, "Got a blob");
    is(blob.size, BLOB_SIZE, "Correct size");
    is(blob.type, BLOB_TYPE, "Correct type");

    info("Sending blob to a worker");

    function workerScript() {
      onmessage = function(event) {
        var blob = event.data;
        var blobUrl = URL.createObjectURL(blob);
        var xhr = new XMLHttpRequest();
        xhr.open('GET', blobUrl, true);
        xhr.responseType = 'text';
        xhr.onload = function() {
          postMessage({ data: xhr.response });
          URL.revokeObjectURL(blobUrl);
        };
        xhr.onerror = function() {
          postMessage({ data: null });
          URL.revokeObjectURL(blobUrl);
        }
        xhr.send();
      }
    }

    let workerScriptUrl =
      URL.createObjectURL(new Blob(["(", workerScript.toSource(), ")()"]));

    let xhrWorker = new Worker(workerScriptUrl);
    xhrWorker.postMessage(blob);
    xhrWorker.onmessage = grabEventAndContinueHandler;
    event = yield undefined;

    is(event.data.data, "Green", "XHR returned expected payload.");
    xhrWorker.terminate();

    URL.revokeObjectURL(workerScriptUrl);

    finishTest();
    yield undefined;
  }
  </script>
  <script type="text/javascript;version=1.7" src="helpers.js"></script>

</head>

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

</html>