tor-browser

The Tor Browser
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blob_worker_crash_iframe.html (3064B)

      1 <!--
      2  Any copyright is dedicated to the Public Domain.
      3  http://creativecommons.org/publicdomain/zero/1.0/
      4 -->
      5 <html>
      6 <head>
      7  <title>Indexed Database Test</title>
      8 
      9  <script type="text/javascript">
     10  function report(result) {
     11    var message = { source: "iframe" };
     12    message.result = result;
     13    window.parent.postMessage(message, "*");
     14  }
     15 
     16  function runIndexedDBTest() {
     17    var db = null;
     18 
     19    // Create the data-store
     20    function createDatastore() {
     21      try {
     22        var request = indexedDB.open(window.location.pathname, 1);
     23        request.onupgradeneeded = function(event) {
     24          event.target.result.createObjectStore("foo");
     25        };
     26        request.onsuccess = function(event) {
     27          db = event.target.result;
     28          createAndStoreBlob();
     29        };
     30      }
     31      catch (e) {
     32 dump("EXCEPTION IN CREATION: " + e + "\n " + e.stack + "\n");
     33        report(false);
     34      }
     35    }
     36 
     37    function createAndStoreBlob() {
     38      const BLOB_DATA = ["fun ", "times ", "all ", "around!"];
     39      var blob = new Blob(BLOB_DATA, { type: "text/plain" });
     40      var objectStore = db.transaction("foo", "readwrite").objectStore("foo");
     41      objectStore.add({ blob }, 42).onsuccess = refetchBlob;
     42    }
     43 
     44    function refetchBlob() {
     45      var foo = db.transaction("foo").objectStore("foo");
     46      foo.get(42).onsuccess = fetchedBlobCreateWorkerAndSendBlob;
     47    }
     48 
     49    function fetchedBlobCreateWorkerAndSendBlob(event) {
     50      var idbBlob = event.target.result.blob;
     51      var compositeBlob = new Blob(["I like the following blob: ", idbBlob],
     52                                   { type: "text/fancy" });
     53 
     54      function workerScript() {
     55        /* eslint-env worker */
     56        onmessage = function(event) {
     57          // Save the Blob to the worker's global scope.
     58          self.holdOntoBlob = event.data;
     59          // Send any message so we can serialize and keep our runtime behaviour
     60          // consistent.
     61          postMessage("kung fu death grip established");
     62        };
     63      }
     64 
     65      var url =
     66        URL.createObjectURL(new Blob(["(", workerScript.toString(), ")()"]));
     67 
     68      // Keep a reference to the worker on the window.
     69      var worker = window.worker = new Worker(url);
     70      worker.postMessage(compositeBlob);
     71      worker.onmessage = workerLatchedBlobDeleteFromDB;
     72    }
     73 
     74    function workerLatchedBlobDeleteFromDB() {
     75      // Delete the reference to the Blob from the database leaving the worker
     76      // thread reference as the only live reference once a GC has cleaned
     77      // out our references that we sent to the worker.  The page that owns
     78      // us triggers a GC just for that reason.
     79      var objectStore = db.transaction("foo", "readwrite").objectStore("foo");
     80      objectStore.delete(42).onsuccess = closeDBTellOwningThread;
     81    }
     82 
     83    function closeDBTellOwningThread() {
     84      // Now that worker has latched the blob, clean up the database.
     85      db.close();
     86      db = null;
     87      report("ready");
     88    }
     89 
     90    createDatastore();
     91  }
     92  </script>
     93 
     94 </head>
     95 
     96 <body onload="runIndexedDBTest();">
     97 </body>
     98 
     99 </html>