tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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browser_shutdown_parent_own_reference.js (3502B)

      1 /* This Source Code Form is subject to the terms of the Mozilla Public
      2 * License, v. 2.0. If a copy of the MPL was not distributed with this
      3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      4 
      5 "use strict";
      6 
      7 add_task(async function () {
      8  await BrowserTestUtils.withNewTab(
      9    {
     10      gBrowser,
     11      url: `data:text/html,
     12      <html>
     13        <head>
     14          <meta charset="utf-8"/>
     15          <title>Accessibility Test</title>
     16        </head>
     17        <body></body>
     18      </html>`,
     19    },
     20    async function (browser) {
     21      info(
     22        "Creating a service in parent and waiting for service to be created " +
     23          "in content"
     24      );
     25      await loadContentScripts(browser, {
     26        script: "Common.sys.mjs",
     27        symbol: "CommonUtils",
     28      });
     29      // Create a11y service in the main process. This will trigger creating of
     30      // the a11y service in parent as well.
     31      const [parentA11yInitObserver, parentA11yInit] = initAccService();
     32      const [contentA11yInitObserver, contentA11yInit] =
     33        initAccService(browser);
     34 
     35      await Promise.all([parentA11yInitObserver, contentA11yInitObserver]);
     36 
     37      let accService = Cc["@mozilla.org/accessibilityService;1"].getService(
     38        Ci.nsIAccessibilityService
     39      );
     40      ok(accService, "Service initialized in parent");
     41      await Promise.all([parentA11yInit, contentA11yInit]);
     42 
     43      info(
     44        "Adding additional reference to accessibility service in content " +
     45          "process"
     46      );
     47      // Add a new reference to the a11y service inside the content process.
     48      await SpecialPowers.spawn(browser, [], () => {
     49        content.CommonUtils.accService;
     50      });
     51 
     52      info(
     53        "Trying to shut down a service in content and making sure it stays " +
     54          "alive as it was started by parent"
     55      );
     56      let contentCanShutdown = false;
     57      // This promise will resolve only if contentCanShutdown flag is set to true.
     58      // If 'a11y-init-or-shutdown' event with '0' flag (in content) comes before
     59      // it can be shut down, the promise will reject.
     60      const [contentA11yShutdownObserver, contentA11yShutdownPromise] =
     61        shutdownAccService(browser);
     62      await contentA11yShutdownObserver;
     63      const contentA11yShutdown = new Promise((resolve, reject) =>
     64        contentA11yShutdownPromise.then(() =>
     65          contentCanShutdown
     66            ? resolve()
     67            : reject("Accessible service was shut down incorrectly")
     68        )
     69      );
     70      // Remove a11y service reference in content and force garbage collection.
     71      // This should not trigger shutdown since a11y was originally initialized by
     72      // the main process.
     73      await SpecialPowers.spawn(browser, [], () => {
     74        content.CommonUtils.clearAccService();
     75      });
     76 
     77      // Have some breathing room between a11y service shutdowns.
     78      await TestUtils.waitForTick();
     79 
     80      info("Removing a service in parent");
     81      // Now allow a11y service to shutdown in content.
     82      contentCanShutdown = true;
     83      // Remove the a11y service reference in the main process.
     84      const [parentA11yShutdownObserver, parentA11yShutdown] =
     85        shutdownAccService();
     86      await parentA11yShutdownObserver;
     87 
     88      accService = null;
     89      ok(!accService, "Service is removed in parent");
     90      // Force garbage collection that should trigger shutdown in both parent and
     91      // content.
     92      forceGC();
     93      await Promise.all([parentA11yShutdown, contentA11yShutdown]);
     94    }
     95  );
     96 });