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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_CONTEXTUAL_SUGGESTIONS_FETCH_H_
#define COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_CONTEXTUAL_SUGGESTIONS_FETCH_H_
#include <memory>
#include <string>
#include <utility>
#include "base/callback.h"
#include "components/ntp_snippets/contextual/contextual_suggestions_result.h"
#include "components/ntp_snippets/contextual/reporting/contextual_suggestions_metrics_reporter.h"
#include "net/base/load_flags.h"
#include "net/http/http_request_headers.h"
#include "url/gurl.h"
namespace network {
class SimpleURLLoader;
class SharedURLLoaderFactory;
} // namespace network
namespace contextual_suggestions {
// A fetch of contextual suggestions. This encapsulates the request-response
// lifecycle. It is also responsible for building and serializing the request
// body protos and parsing the response body protos.
class ContextualSuggestionsFetch {
public:
ContextualSuggestionsFetch(const GURL& url,
const std::string& bcp_language,
bool include_cookies);
~ContextualSuggestionsFetch();
// Get the url used to fetch suggestions.
static const std::string GetFetchEndpoint();
// Start fetching suggestions using |loader_factory| to construct a
// URLLoader, and calling |callback| when finished.
void Start(
FetchClustersCallback callback,
ReportFetchMetricsCallback metrics_callback,
const scoped_refptr<network::SharedURLLoaderFactory>& loader_factory);
private:
std::unique_ptr<network::SimpleURLLoader> MakeURLLoader() const;
net::HttpRequestHeaders MakeHeaders() const;
void OnURLLoaderComplete(ReportFetchMetricsCallback metrics_callback,
std::unique_ptr<std::string> result);
void ReportFetchMetrics(size_t clusters_size,
ReportFetchMetricsCallback metrics_callback);
// The url for which we're fetching suggestions.
const GURL url_;
// Identifier for the spoken language in BCP47 format.
const std::string bcp_language_code_;
bool include_cookies_ = false;
// The loader for downloading the suggestions. Only non-null if a fetch is
// currently ongoing.
std::unique_ptr<network::SimpleURLLoader> url_loader_;
// The callback to notify when results are available.
FetchClustersCallback request_completed_callback_;
DISALLOW_COPY_AND_ASSIGN(ContextualSuggestionsFetch);
};
} // namespace contextual_suggestions
#endif // COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_CONTEXTUAL_SUGGESTIONS_FETCH_H_
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