test_blob_worker_xhr_read_slice.html

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<!--

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  http://creativecommons.org/publicdomain/zero/1.0/

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<html>

<head>

  <title>Indexed Database Blob Read From Worker</title>

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

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

  <script type="text/javascript">

/**

   * Create an IndexedDB-backed Blob, send it to the worker, try and read the

   * *SLICED* contents of the Blob from the worker using an XHR.  This is

   * (as of the time of writing this) basically the same as

   * test_blob_worker_xhr_read.html but with slicing added.

*/

  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() {

      /* eslint-env worker */

      onmessage = function(event) {

        var blob = event.data;

        var slicedBlob = blob.slice(0, 3, "text/plain");

        var blobUrl = URL.createObjectURL(slicedBlob);

        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.toString(), ")()"]));

    let xhrWorker = new Worker(workerScriptUrl);

    xhrWorker.postMessage(blob);

    xhrWorker.onmessage = grabEventAndContinueHandler;

    event = yield undefined;

    is(event.data.data, "Gre", "XHR returned expected sliced payload.");

    xhrWorker.terminate();

    URL.revokeObjectURL(workerScriptUrl);

    finishTest();

  </script>

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

</head>

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

</html>