components/prefs/scoped_user_pref_update.cc

   1 // Copyright 2013 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/prefs/scoped_user_pref_update.h"
   6
   7 #include "base/check_op.h"
   8 #include "components/prefs/pref_notifier.h"
   9 #include "components/prefs/pref_service.h"
  10
  11 // TODO(crbug.com/1419591): The following two can be removed after resolving
  12 // the problem.
  13 #include "base/debug/crash_logging.h"
  14 #include "base/debug/dump_without_crashing.h"
  15 #include "base/types/cxx23_to_underlying.h"
  16
  17 namespace subtle {
  18
  19 ScopedUserPrefUpdateBase::ScopedUserPrefUpdateBase(PrefService* service,
  20                                                    const std::string& path)
  21     : service_(service), path_(path), value_(nullptr) {
  22   DCHECK_CALLED_ON_VALID_SEQUENCE(service_->sequence_checker_);
  23 }
  24
  25 ScopedUserPrefUpdateBase::~ScopedUserPrefUpdateBase() {
  26   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  27   Notify();
  28 }
  29
  30 base::Value* ScopedUserPrefUpdateBase::GetValueOfType(base::Value::Type type) {
  31   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  32   if (!value_)
  33     value_ = service_->GetMutableUserPref(path_, type);
  34   if (!value_) {
  35     // TODO(crbug.com/1419591) This is unexpected, so let's collect some data.
  36     const PrefService::Preference* pref = service_->FindPreference(path_);
  37     SCOPED_CRASH_KEY_NUMBER(
  38         "ScopedUserPrefUpdate", "PrevServiceStatus",
  39         base::to_underlying(service_->GetInitializationStatus()));
  40     SCOPED_CRASH_KEY_STRING32("ScopedUserPrefUpdate", "FindPreference",
  41                               pref ? "Yes" : "No");
  42     SCOPED_CRASH_KEY_NUMBER("ScopedUserPrefUpdate", "Type",
  43                             pref ? base::to_underlying(pref->GetType()) : -1);
  44     base::debug::DumpWithoutCrashing();
  45   }
  46   return value_;
  47 }
  48
  49 void ScopedUserPrefUpdateBase::Notify() {
  50   if (value_) {
  51     service_->ReportUserPrefChanged(path_);
  52     value_ = nullptr;
  53   }
  54 }
  55
  56 }  // namespace subtle
  57
  58 base::Value::Dict& ScopedDictPrefUpdate::Get() {
  59   return GetValueOfType(base::Value::Type::DICT)->GetDict();
  60 }
  61
  62 base::Value::List& ScopedListPrefUpdate::Get() {
  63   return GetValueOfType(base::Value::Type::LIST)->GetList();
  64 }