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// Copyright 2020 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_FEED_CORE_V2_IMAGE_FETCHER_H_
#define COMPONENTS_FEED_CORE_V2_IMAGE_FETCHER_H_
#include <optional>
#include "base/containers/flat_map.h"
#include "base/functional/callback.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "components/feed/core/v2/public/types.h"
#include "url/gurl.h"
namespace network {
class SharedURLLoaderFactory;
class SimpleURLLoader;
} // namespace network
namespace feed {
struct NetworkResponse;
// Fetcher object to retrieve an image resource from a URL.
class ImageFetcher {
public:
using ImageCallback = base::OnceCallback<void(NetworkResponse)>;
explicit ImageFetcher(
scoped_refptr<::network::SharedURLLoaderFactory> url_loader_factory);
virtual ~ImageFetcher();
ImageFetcher(const ImageFetcher&) = delete;
ImageFetcher& operator=(const ImageFetcher&) = delete;
virtual ImageFetchId Fetch(const GURL& url, ImageCallback callback);
virtual void Cancel(ImageFetchId id);
private:
struct PendingRequest {
PendingRequest(std::unique_ptr<network::SimpleURLLoader> loader,
ImageCallback callback);
PendingRequest(PendingRequest&& other);
PendingRequest& operator=(PendingRequest&& other);
~PendingRequest();
std::unique_ptr<network::SimpleURLLoader> loader;
ImageCallback callback;
};
// Called when fetch request completes.
void OnFetchComplete(ImageFetchId id,
const GURL& url,
std::unique_ptr<std::string> response_data);
std::optional<PendingRequest> RemovePending(ImageFetchId id);
uint64_t GetTrackId(ImageFetchId id) const;
ImageFetchId::Generator id_generator_;
base::flat_map<ImageFetchId, PendingRequest> pending_requests_;
const scoped_refptr<::network::SharedURLLoaderFactory> url_loader_factory_;
base::WeakPtrFactory<ImageFetcher> weak_factory_{this};
};
} // namespace feed
#endif // COMPONENTS_FEED_CORE_V2_IMAGE_FETCHER_H_
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