tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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browser_perf-01.js (3464B)

      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 "use strict";
      5 
      6 const { ProfilerTestUtils } = ChromeUtils.importESModule(
      7  "resource://testing-common/ProfilerTestUtils.sys.mjs"
      8 );
      9 
     10 add_setup(ProfilerTestUtils.assertProfilerInactive);
     11 
     12 // This test is at the edge of timing out, probably because of LUL
     13 // initialization on Linux. This is also happening only once, which is why only
     14 // this test needs it: for other tests LUL is already initialized because
     15 // they're running in the same Firefox instance.
     16 // See also bug 1635442.
     17 requestLongerTimeout(2);
     18 
     19 async function decompressGzip(buffer) {
     20  if (buffer.resizable) {
     21    // Not sure why, but we can't use a resizable buffer for streams.
     22    buffer = buffer.transferToFixedLength();
     23  }
     24  const decompressionStream = new DecompressionStream("gzip");
     25  const decoderStream = new TextDecoderStream();
     26  const decodedStream = decompressionStream.readable.pipeThrough(decoderStream);
     27  const writer = decompressionStream.writable.getWriter();
     28  writer.write(buffer);
     29  const writePromise = writer.close();
     30 
     31  let result = "";
     32  for await (const chunk of decodedStream) {
     33    result += chunk;
     34  }
     35 
     36  await writePromise;
     37  return JSON.parse(result);
     38 }
     39 
     40 /**
     41 * Run through a series of basic recording actions for the perf actor.
     42 */
     43 add_task(async function () {
     44  const { front, client } = await initPerfFront();
     45 
     46  // Assert the initial state.
     47  is(
     48    await front.isSupportedPlatform(),
     49    true,
     50    "This test only runs on supported platforms."
     51  );
     52  is(await front.isActive(), false, "The profiler is not active yet.");
     53 
     54  // Start the profiler.
     55  const profilerStarted = once(front, "profiler-started");
     56  await front.startProfiler();
     57  await profilerStarted;
     58  is(await front.isActive(), true, "The profiler was started.");
     59 
     60  // Stop the profiler and assert the results.
     61  const profilerStopped1 = once(front, "profiler-stopped");
     62  const { profile: gzippedProfile, additionalInformation } =
     63    await front.getProfileAndStopProfiler();
     64  await profilerStopped1;
     65  is(await front.isActive(), false, "The profiler was stopped.");
     66  const profile = await decompressGzip(gzippedProfile);
     67  ok("threads" in profile, "The actor was used to record a profile.");
     68  ok(
     69    additionalInformation.sharedLibraries,
     70    "We retrieved some shared libraries as well."
     71  );
     72 
     73  // Restart the profiler.
     74  await front.startProfiler();
     75  is(await front.isActive(), true, "The profiler was re-started.");
     76 
     77  // Stop and discard.
     78  const profilerStopped2 = once(front, "profiler-stopped");
     79  await front.stopProfilerAndDiscardProfile();
     80  await profilerStopped2;
     81  is(
     82    await front.isActive(),
     83    false,
     84    "The profiler was stopped and the profile discarded."
     85  );
     86 
     87  await front.destroy();
     88  await client.close();
     89 });
     90 
     91 add_task(async function test_error_case() {
     92  const { front, client } = await initPerfFront();
     93 
     94  try {
     95    // We try to get the profile without starting the profiler first. This should
     96    // trigger an error in the our C++ code.
     97    await front.getProfileAndStopProfiler();
     98    ok(false, "Getting the profile should fail");
     99  } catch (e) {
    100    Assert.stringContains(
    101      e.message,
    102      "The profiler is not active.",
    103      "The error contains the expected error message."
    104    );
    105  }
    106 
    107  await front.destroy();
    108  await client.close();
    109 });