Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/Sources/formale Sprachen/C/Firefox/xpcom/base/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 6 kB

Quelle LogModulePrefWatcher.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "LogModulePrefWatcher.h"

#include "mozilla/Logging.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
#include "nsIObserverService.h"
#include "NSPRLogModulesParser.h"
#include "nsString.h"
#include "nsXULAppAPI.h"
#include "prenv.h"
#include "base/process_util.h"

static const char kLoggingPrefPrefix[] = "logging.";
static const char kLoggingConfigPrefPrefix[] = "logging.config";
static const int kLoggingConfigPrefixLen = sizeof(kLoggingConfigPrefPrefix) - 1;
static const char kLoggingPrefClearOnStartup[] =
    "logging.config.clear_on_startup";
static const char kLoggingPrefLogFile[] = "logging.config.LOG_FILE";
static const char kLoggingPrefAddTimestamp[] = "logging.config.add_timestamp";
static const char kLoggingPrefSync[] = "logging.config.sync";
static const char kLoggingPrefStacks[] = "logging.config.profilerstacks";
static const char kLoggingPrefLogModules[] = "logging.config.modules";

namespace mozilla {

NS_IMPL_ISUPPORTS(LogModulePrefWatcher, nsIObserver)

/**
* Resets all the preferences in the logging. branch
* This is needed because we may crash while logging, and this would cause us
* to log after restarting as well.
*
* If logging after restart is desired, set the logging.config.clear_on_startup
* pref to false, or use the MOZ_LOG_FILE and MOZ_LOG_MODULES env vars.
*/
static void ResetExistingPrefs() {
  nsTArray<nsCString> names;
  nsresult rv =
      Preferences::GetRootBranch()->GetChildList(kLoggingPrefPrefix, names);
  if (NS_SUCCEEDED(rv)) {
    for (auto& name : names) {
      // Clearing the pref will cause it to reload, thus resetting the log level
      Preferences::ClearUser(name.get());
    }
  }
}

/**
* Loads the log level from the given pref and updates the corresponding
* LogModule.
*/
static void LoadPrefValue(const char* aName) {
  LogLevel logLevel = LogLevel::Disabled;

  nsresult rv;
  int32_t prefLevel = 0;
  nsAutoCString prefValue;

  if (strncmp(aName, kLoggingConfigPrefPrefix, kLoggingConfigPrefixLen) == 0) {
    nsAutoCString prefName(aName);

    if (prefName.EqualsLiteral(kLoggingPrefLogFile)) {
      rv = Preferences::GetCString(aName, prefValue);
      // The pref was reset. Clear the user file.
      if (NS_FAILED(rv) || prefValue.IsEmpty()) {
        LogModule::SetLogFile(nullptr);
        return;
      }

      // If the pref value doesn't have a PID placeholder, append it to the end.
      if (!strstr(prefValue.get(), MOZ_LOG_PID_TOKEN)) {
        prefValue.AppendLiteral(MOZ_LOG_PID_TOKEN);
      }

      LogModule::SetLogFile(prefValue.BeginReading());
    } else if (prefName.EqualsLiteral(kLoggingPrefAddTimestamp)) {
      bool addTimestamp = Preferences::GetBool(aName, false);
      LogModule::SetAddTimestamp(addTimestamp);
    } else if (prefName.EqualsLiteral(kLoggingPrefSync)) {
      bool sync = Preferences::GetBool(aName, false);
      LogModule::SetIsSync(sync);
    } else if (prefName.EqualsLiteral(kLoggingPrefStacks)) {
      bool captureStacks = Preferences::GetBool(aName, false);
      LogModule::SetCaptureStacks(captureStacks);
    } else if (prefName.EqualsLiteral(kLoggingPrefLogModules)) {
      // The content of the preference will be parsed as a MOZ_LOG string, then
      // the corresponding log modules (if any) will be enabled, others will be
      // disabled.
      LogModule::DisableModules();
      LogModule::SetCaptureStacks(false);

      const char* modulesFromEnv = PR_GetEnv("MOZ_LOG");
      const bool hasModulesEnv = modulesFromEnv && modulesFromEnv[0];

      rv = Preferences::GetCString(aName, prefValue);
      const bool hasModulesPref = NS_SUCCEEDED(rv) && !prefValue.IsEmpty();

      if (hasModulesEnv || hasModulesPref) {
        NSPRLogModulesParser(
            hasModulesPref ? prefValue.BeginReading() : modulesFromEnv,
            [](const char* aName, LogLevel aLevel, int32_t aValue) mutable {
              // Only the special string "profilerstacks" is taken into account,
              // because we're especially interested in usage with the Firefox
              // Profiler.
              if (strcmp(aName, "profilerstacks") == 0) {
                LogModule::SetCaptureStacks(true);
              } else {
                LogModule::Get(aName)->SetLevel(aLevel);
              }
            });
      }
    }
  }

  if (Preferences::GetInt(aName, &prefLevel) == NS_OK) {
    logLevel = ToLogLevel(prefLevel);
  } else if (Preferences::GetCString(aName, prefValue) == NS_OK) {
    if (prefValue.LowerCaseEqualsLiteral("error")) {
      logLevel = LogLevel::Error;
    } else if (prefValue.LowerCaseEqualsLiteral("warning")) {
      logLevel = LogLevel::Warning;
    } else if (prefValue.LowerCaseEqualsLiteral("info")) {
      logLevel = LogLevel::Info;
    } else if (prefValue.LowerCaseEqualsLiteral("debug")) {
      logLevel = LogLevel::Debug;
    } else if (prefValue.LowerCaseEqualsLiteral("verbose")) {
      logLevel = LogLevel::Verbose;
    }
  }

  const char* moduleName = aName + strlen(kLoggingPrefPrefix);
  LogModule::Get(moduleName)->SetLevel(logLevel);
}

static void LoadExistingPrefs() {
  nsIPrefBranch* root = Preferences::GetRootBranch();
  if (!root) {
    return;
  }

  nsTArray<nsCString> names;
  nsresult rv = root->GetChildList(kLoggingPrefPrefix, names);
  if (NS_SUCCEEDED(rv)) {
    for (auto& name : names) {
      LoadPrefValue(name.get());
    }
  }
}

LogModulePrefWatcher::LogModulePrefWatcher() = default;

void LogModulePrefWatcher::RegisterPrefWatcher() {
  RefPtr<LogModulePrefWatcher> prefWatcher = new LogModulePrefWatcher();
  Preferences::AddStrongObserver(prefWatcher, kLoggingPrefPrefix);

  nsCOMPtr<nsIObserverService> observerService =
      mozilla::services::GetObserverService();
  if (observerService && XRE_IsParentProcess()) {
    observerService->AddObserver(prefWatcher,
                                 "browser-delayed-startup-finished", false);
  }

  LoadExistingPrefs();
}

NS_IMETHODIMP
LogModulePrefWatcher::Observe(nsISupports* aSubject, const char* aTopic,
                              const char16_t* aData) {
  if (strcmp(NS_PREFBRANCH_PREFCHANGE_TOPIC_ID, aTopic) == 0) {
    NS_LossyConvertUTF16toASCII prefName(aData);
    LoadPrefValue(prefName.get());
  } else if (strcmp("browser-delayed-startup-finished", aTopic) == 0) {
    bool clear = Preferences::GetBool(kLoggingPrefClearOnStartup, true);
    if (clear) {
      ResetExistingPrefs();
    }
    nsCOMPtr<nsIObserverService> observerService =
        mozilla::services::GetObserverService();
    if (observerService) {
      observerService->RemoveObserver(this, "browser-delayed-startup-finished");
    }
  }

  return NS_OK;
}

}  // namespace mozilla

quality97%

¤ Dauer der Verarbeitung: 0.1 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.