chromecast/browser/cast_feature_list_creator.cc

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chromecast/browser/cast_feature_list_creator.h"

#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/strings/string_util.h"
#include "base/values.h"
#include "chromecast/base/cast_features.h"
#include "chromecast/base/pref_names.h"
#include "chromecast/browser/metrics/cast_metrics_prefs.h"
#include "chromecast/browser/pref_service_helper.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service.h"
#include "components/proxy_config/pref_proxy_config_tracker_impl.h"

namespace chromecast {

namespace {

// Convert the |features| vector into a comma separated string.
std::string FeatureVectorToString(
    const std::vector<const base::Feature*>& features) {
  std::vector<std::string> feature_names;

  for (const auto* feature : features)
    feature_names.push_back(feature->name);

  return base::JoinString(feature_names, ",");
}

}  // namespace

CastFeatureListCreator::CastFeatureListCreator() {}

CastFeatureListCreator::~CastFeatureListCreator() {}

void CastFeatureListCreator::CreatePrefServiceAndFeatureList(
    ProcessType process_type) {
  DCHECK(!pref_service_);

  scoped_refptr<PrefRegistrySimple> pref_registry(new PrefRegistrySimple());
  metrics::RegisterPrefs(pref_registry.get());
  PrefProxyConfigTrackerImpl::RegisterPrefs(pref_registry.get());
  pref_service_ = shell::PrefServiceHelper::CreatePrefService(
      pref_registry.get(), process_type);

  const base::Value::Dict& features_dict =
      pref_service_->GetDict(prefs::kLatestDCSFeatures);
  const base::Value::List& experiment_ids =
      pref_service_->GetList(prefs::kActiveDCSExperiments);
  auto* command_line = base::CommandLine::ForCurrentProcess();
  InitializeFeatureList(
      features_dict, experiment_ids,
      command_line->GetSwitchValueASCII(switches::kEnableFeatures),
      command_line->GetSwitchValueASCII(switches::kDisableFeatures),
      extra_enable_features_, extra_disable_features_);
}

std::unique_ptr<PrefService> CastFeatureListCreator::TakePrefService() {
  return std::move(pref_service_);
}

void CastFeatureListCreator::SetExtraEnableFeatures(
    const std::vector<const base::Feature*>& extra_enable_features) {
  extra_enable_features_ = FeatureVectorToString(extra_enable_features);
}

void CastFeatureListCreator::SetExtraDisableFeatures(
    const std::vector<const base::Feature*>& extra_disable_features) {
  extra_disable_features_ = FeatureVectorToString(extra_disable_features);
}

}  // namespace chromecast