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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/segmentation_platform/embedder/default_model/device_switcher_result_dispatcher.h"
#include "base/feature_list.h"
#include "base/task/sequenced_task_runner.h"
#include "base/values.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/scoped_user_pref_update.h"
#include "components/segmentation_platform/embedder/default_model/device_switcher_model.h"
#include "components/segmentation_platform/public/constants.h"
#include "components/segmentation_platform/public/features.h"
#include "components/segmentation_platform/public/field_trial_register.h"
#include "components/segmentation_platform/public/result.h"
namespace segmentation_platform {
namespace {
const char kDeviceSwitcherUserSegmentPrefKey[] =
"segmentation_platform.device_switcher_util";
}
const char kDeviceSwitcherFieldTrialName[] = "Segmentation_DeviceSwitcher";
DeviceSwitcherResultDispatcher::DeviceSwitcherResultDispatcher(
SegmentationPlatformService* segmentation_service,
syncer::DeviceInfoTracker* device_info_tracker,
PrefService* prefs,
FieldTrialRegister* field_trial_register)
: segmentation_service_(segmentation_service),
device_info_tracker_(device_info_tracker),
prefs_(prefs),
field_trial_register_(field_trial_register) {
latest_result_ = ReadResultFromPref();
RegisterFieldTrials();
if (!device_info_tracker_->IsSyncing()) {
device_info_observation_.Observe(device_info_tracker_);
}
RefreshSegmentResultIfNeeded();
}
DeviceSwitcherResultDispatcher::~DeviceSwitcherResultDispatcher() = default;
ClassificationResult
DeviceSwitcherResultDispatcher::GetCachedClassificationResult() {
std::optional<ClassificationResult> result =
latest_result_ ? latest_result_ : ReadResultFromPref();
return result.has_value() ? result.value()
: ClassificationResult(PredictionStatus::kNotReady);
}
void DeviceSwitcherResultDispatcher::WaitForClassificationResult(
base::TimeDelta timeout,
ClassificationResultCallback callback) {
if (latest_result_) {
std::move(callback).Run(std::move(*latest_result_));
return;
}
// This class does not support waiting for multiple requests.
DCHECK(waiting_callback_.is_null());
waiting_callback_ = std::move(callback);
base::SequencedTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&DeviceSwitcherResultDispatcher::OnWaitTimeout,
weak_ptr_factory_.GetWeakPtr()),
timeout);
}
// static
void DeviceSwitcherResultDispatcher::RegisterProfilePrefs(
PrefRegistrySimple* registry) {
registry->RegisterDictionaryPref(kDeviceSwitcherUserSegmentPrefKey);
}
void DeviceSwitcherResultDispatcher::OnDeviceInfoChange() {
if (!device_info_tracker_->IsSyncing()) {
return;
}
device_info_observation_.Reset();
RefreshSegmentResultIfNeeded();
}
void DeviceSwitcherResultDispatcher::RefreshSegmentResultIfNeeded() {
if (!base::FeatureList::IsEnabled(
features::kSegmentationPlatformDeviceSwitcher)) {
return;
}
if (latest_result_ && (latest_result_->ordered_labels.empty() ||
latest_result_->ordered_labels[0] !=
DeviceSwitcherModel::kNotSyncedLabel)) {
return;
}
PredictionOptions options;
options.on_demand_execution = true;
segmentation_service_->GetClassificationResult(
kDeviceSwitcherKey, options, nullptr,
base::BindOnce(&DeviceSwitcherResultDispatcher::OnGotResult,
weak_ptr_factory_.GetWeakPtr()));
}
void DeviceSwitcherResultDispatcher::OnGotResult(
const ClassificationResult& result) {
SaveResultToPref(result);
latest_result_ = result;
RegisterFieldTrials();
if (!waiting_callback_.is_null()) {
std::move(waiting_callback_).Run(result);
}
}
void DeviceSwitcherResultDispatcher::OnWaitTimeout() {
if (!waiting_callback_.is_null()) {
std::move(waiting_callback_)
.Run(ClassificationResult(PredictionStatus::kNotReady));
}
}
void DeviceSwitcherResultDispatcher::RegisterFieldTrials() {
if (!field_trial_register_ || !latest_result_) {
return;
}
if (latest_result_->status == PredictionStatus::kSucceeded &&
!latest_result_->ordered_labels.empty()) {
field_trial_register_->RegisterFieldTrial(
kDeviceSwitcherFieldTrialName, latest_result_->ordered_labels[0]);
} else {
field_trial_register_->RegisterFieldTrial(kDeviceSwitcherFieldTrialName,
"Unselected");
}
}
void DeviceSwitcherResultDispatcher::SaveResultToPref(
const ClassificationResult& result) {
ScopedDictPrefUpdate update(prefs_, kDeviceSwitcherUserSegmentPrefKey);
base::Value::Dict& dictionary = update.Get();
if (result.status != PredictionStatus::kSucceeded) {
dictionary.Remove("result");
return;
}
base::Value::Dict segmentation_result;
base::Value::List labels;
for (const auto& label : result.ordered_labels) {
labels.Append(label);
}
segmentation_result.Set("labels", std::move(labels));
dictionary.Set("result", std::move(segmentation_result));
}
std::optional<ClassificationResult>
DeviceSwitcherResultDispatcher::ReadResultFromPref() const {
ClassificationResult result(PredictionStatus::kNotReady);
const base::Value::Dict& dictionary =
prefs_->GetDict(kDeviceSwitcherUserSegmentPrefKey);
const base::Value* value = dictionary.Find("result");
if (!value) {
return std::nullopt;
}
const base::Value::Dict& segmentation_result = value->GetDict();
const base::Value::List* labels_value =
segmentation_result.FindList("labels");
if (!labels_value) {
return std::nullopt;
}
for (const auto& label : *labels_value) {
result.ordered_labels.push_back(label.GetString());
}
result.status = PredictionStatus::kSucceeded;
return result;
}
} // namespace segmentation_platform
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