test_logFromPreference.js

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/* Any copyright is dedicated to the Public Domain.

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

const kPrefName = "logging.prof";

const kPrefValue = 5;

add_task(async () => {

  Services.prefs.setIntPref(kPrefName, kPrefValue);

  registerCleanupFunction(() => {

    Services.prefs.clearUserPref(kPrefName);

});

  const entries = 10000;

  const interval = 1;

  const threads = ["GeckoMain"];

  const features = ["nostacksampling"];

  await Services.profiler.StartProfiler(entries, interval, features, threads);

  // We need to pause the profiler here, otherwise we get crashes.

  // This seems to be a combination of json streaming + markers from Rust.

  // See Bug 1920704 for more details.

  await Services.profiler.Pause();

  const profileData = await Services.profiler.getProfileDataAsync();

  await Services.profiler.StopProfiler();

  const { markers, stringTable } = profileData.threads[0];

  // The "prof" log module is enabled via kPrefName = "logging.prof". Profiler

  // operations (e.g. profiler_pause) emit MOZ_LOG calls to this module while

  // the profiler is active, which should appear as markers named "prof".

  const stringIndexForProf = stringTable.indexOf("prof");

  Assert.greaterOrEqual(

    stringIndexForProf,

0,

    "A string index for the string 'prof' have been found."

);

  const logMessageMarkers = markers.data.filter(

    tuple => tuple[markers.schema.name] === stringIndexForProf

);

  Assert.greater(

    logMessageMarkers.length,

0,

    "At least one log message have been found."

);

});