test_logFromPreference.js

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/* Any copyright is dedicated to the Public Domain.

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

const kModulesPref = "logging.config.modules";

add_task(async () => {

  Services.prefs.setStringPref(kModulesPref, "prof:5");

  registerCleanupFunction(() => {

    Services.prefs.clearUserPref(kModulesPref);

});

  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];

  const stringIndexForLogMessages = stringTable.indexOf("LogMessages");

  Assert.greaterOrEqual(

    stringIndexForLogMessages,

0,

    "A string index for the string LogMessages have been found."

);

  // At least one log for the profiler json streaming operation should exist.

  // See https://searchfox.org/mozilla-central/rev/445a6e86233c733c5557ef44e1d33444adaddefc/mozglue/baseprofiler/core/platform.cpp#2015

  const logMessageMarkers = markers.data.filter(

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

);

  Assert.greaterOrEqual(

    logMessageMarkers.length,

0,

    "At least one log message have been found."

);

});