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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_OPTIMIZATION_GUIDE_CORE_PREDICTION_MODEL_FETCHER_IMPL_H_
#define COMPONENTS_OPTIMIZATION_GUIDE_CORE_PREDICTION_MODEL_FETCHER_IMPL_H_
#include <memory>
#include <string>
#include <vector>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/sequence_checker.h"
#include "components/optimization_guide/core/prediction_model_fetcher.h"
#include "components/optimization_guide/proto/models.pb.h"
#include "url/gurl.h"
namespace network {
class SharedURLLoaderFactory;
class SimpleURLLoader;
} // namespace network
namespace optimization_guide {
// A class to handle requests for prediction models (and prediction data) from
// a remote Optimization Guide Service.
//
// This class fetches new models from the remote Optimization Guide Service.
class PredictionModelFetcherImpl : public PredictionModelFetcher {
public:
PredictionModelFetcherImpl(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
const GURL& optimization_guide_service_get_models_url);
PredictionModelFetcherImpl(const PredictionModelFetcherImpl&) = delete;
PredictionModelFetcherImpl& operator=(const PredictionModelFetcherImpl&) =
delete;
~PredictionModelFetcherImpl() override;
// PredictionModelFetcher implementation
bool FetchOptimizationGuideServiceModels(
const std::vector<proto::ModelInfo>& models_request_info,
proto::RequestContext request_context,
const std::string& locale,
ModelsFetchedCallback models_fetched_callback) override;
private:
// URL loader completion callback.
void OnURLLoadComplete(std::unique_ptr<std::string> response_body);
// Handles the response from the remote Optimization Guide Service.
// |response| is the response body, |status| is the
// |net::Error| of the response, and response_code is the HTTP
// response code (if available).
void HandleResponse(const std::string& response,
int status,
int response_code);
// Used to hold the callback while the SimpleURLLoader performs the request
// asynchronously.
ModelsFetchedCallback models_fetched_callback_;
// The URL for the remote Optimization Guide Service that serves models and
// host features.
const GURL optimization_guide_service_get_models_url_;
// Used to hold the GetModelsRequest being constructed and sent as a remote
// request.
std::unique_ptr<optimization_guide::proto::GetModelsRequest>
pending_models_request_;
// Holds the URLLoader for an active hints request.
std::unique_ptr<network::SimpleURLLoader> url_loader_;
// Used for creating a |url_loader_| when needed for request hints.
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory_;
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace optimization_guide
#endif // COMPONENTS_OPTIMIZATION_GUIDE_CORE_PREDICTION_MODEL_FETCHER_IMPL_H_
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