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// Copyright 2022 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/internal/selection/request_handler.h"
#include "base/memory/raw_ref.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/single_thread_task_runner.h"
#include "components/segmentation_platform/internal/post_processor/post_processor.h"
#include "components/segmentation_platform/internal/selection/segment_result_provider.h"
#include "components/segmentation_platform/internal/selection/selection_utils.h"
#include "components/segmentation_platform/internal/stats.h"
#include "components/segmentation_platform/public/config.h"
#include "components/segmentation_platform/public/input_context.h"
#include "components/segmentation_platform/public/prediction_options.h"
#include "components/segmentation_platform/public/result.h"
#include "components/segmentation_platform/public/trigger.h"
namespace segmentation_platform {
namespace {
class RequestHandlerImpl : public RequestHandler {
public:
RequestHandlerImpl(const Config& config,
std::unique_ptr<SegmentResultProvider> result_provider,
ExecutionService* execution_service,
StorageService* storage_service);
~RequestHandlerImpl() override;
// Disallow copy/assign.
RequestHandlerImpl(const RequestHandlerImpl&) = delete;
RequestHandlerImpl& operator=(const RequestHandlerImpl&) = delete;
// RequestHandler impl.
void GetPredictionResult(const PredictionOptions& options,
scoped_refptr<InputContext> input_context,
RawResultCallback callback) override;
private:
void GetModelResult(const PredictionOptions& options,
scoped_refptr<InputContext> input_context,
SegmentResultProvider::SegmentResultCallback callback);
void OnGetPredictionResult(
const PredictionOptions& options,
scoped_refptr<InputContext> input_context,
RawResultCallback callback,
std::unique_ptr<SegmentResultProvider::SegmentResult> result);
TrainingRequestId CollectTrainingData(
scoped_refptr<InputContext> input_context,
ModelProvider::Request inputs);
// The config for providing client config params.
const raw_ref<const Config> config_;
// The result provider responsible for getting the result, either by running
// the model or getting results from the cache as necessary.
std::unique_ptr<SegmentResultProvider> result_provider_;
// Pointer to the execution service.
const raw_ptr<ExecutionService> execution_service_ = nullptr;
const raw_ptr<StorageService> storage_service_ = nullptr;
base::WeakPtrFactory<RequestHandlerImpl> weak_ptr_factory_{this};
};
RequestHandlerImpl::RequestHandlerImpl(
const Config& config,
std::unique_ptr<SegmentResultProvider> result_provider,
ExecutionService* execution_service,
StorageService* storage_service)
: config_(config),
result_provider_(std::move(result_provider)),
execution_service_(execution_service),
storage_service_(storage_service) {}
RequestHandlerImpl::~RequestHandlerImpl() = default;
void RequestHandlerImpl::GetPredictionResult(
const PredictionOptions& options,
scoped_refptr<InputContext> input_context,
RawResultCallback callback) {
DCHECK(options.on_demand_execution ||
(!options.on_demand_execution && options.fallback_allowed));
GetModelResult(options, input_context,
base::BindOnce(&RequestHandlerImpl::OnGetPredictionResult,
weak_ptr_factory_.GetWeakPtr(), options,
input_context, std::move(callback)));
}
void RequestHandlerImpl::GetModelResult(
const PredictionOptions& options,
scoped_refptr<InputContext> input_context,
SegmentResultProvider::SegmentResultCallback callback) {
DCHECK_EQ(config_->segments.size(), 1u);
auto result_options =
std::make_unique<SegmentResultProvider::GetResultOptions>();
// Note that, this assumes that a client has only one model.
result_options->segment_id = config_->segments.begin()->first;
result_options->ignore_db_scores = true;
result_options->input_context = input_context;
result_options->callback = std::move(callback);
result_provider_->GetSegmentResult(std::move(result_options));
}
void RequestHandlerImpl::OnGetPredictionResult(
const PredictionOptions& options,
scoped_refptr<InputContext> input_context,
RawResultCallback callback,
std::unique_ptr<SegmentResultProvider::SegmentResult> segment_result) {
RawResult result(PredictionStatus::kFailed);
if (segment_result) {
auto status =
selection_utils::ResultStateToPredictionStatus(segment_result->state);
result = PostProcessor().GetRawResult(segment_result->result, status);
if (status == PredictionStatus::kSucceeded) {
CHECK(segment_result->model_inputs)
<< "Handler should be used only for on demand execution: "
<< config_->segmentation_key;
result.request_id = CollectTrainingData(
input_context, std::move(*segment_result->model_inputs));
}
stats::RecordSegmentSelectionFailure(
*config_, stats::GetSuccessOrFailureReason(segment_result->state));
stats::RecordClassificationResultComputed(*config_, segment_result->result);
// Update prefs for future requests.
if (options.can_update_cache_for_future_requests) {
proto::ClientResult client_result =
metadata_utils::CreateClientResultFromPredResult(
segment_result->result, base::Time::Now());
storage_service_->cached_result_writer()->UpdatePrefsIfExpired(
&(*config_), client_result, PlatformOptions::CreateDefault());
}
}
std::move(callback).Run(std::move(result));
}
TrainingRequestId RequestHandlerImpl::CollectTrainingData(
scoped_refptr<InputContext> input_context,
ModelProvider::Request inputs) {
// The training data collector might be null in testing.
if (!execution_service_->training_data_collector()) {
return TrainingRequestId();
}
return execution_service_->training_data_collector()->OnDecisionTime(
config_->segments.begin()->first, input_context,
proto::TrainingOutputs::TriggerConfig::ONDEMAND, std::move(inputs));
}
} // namespace
// static
std::unique_ptr<RequestHandler> RequestHandler::Create(
const Config& config,
std::unique_ptr<SegmentResultProvider> result_provider,
ExecutionService* execution_service,
StorageService* storage_service) {
return std::make_unique<RequestHandlerImpl>(
config, std::move(result_provider), execution_service, storage_service);
}
} // namespace segmentation_platform
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