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// Copyright 2017 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_REMOTE_CACHED_IMAGE_FETCHER_H_
#define COMPONENTS_NTP_SNIPPETS_REMOTE_CACHED_IMAGE_FETCHER_H_
#include <cstddef>
#include <memory>
#include <string>
#include <vector>
#include "base/callback_forward.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "components/ntp_snippets/callbacks.h"
#include "components/ntp_snippets/content_suggestion.h"
#include "components/ntp_snippets/remote/request_throttler.h"
class PrefService;
namespace gfx {
class Image;
} // namespace gfx
namespace image_fetcher {
class ImageFetcher;
struct RequestMetadata;
} // namespace image_fetcher
namespace ntp_snippets {
class RemoteSuggestionsDatabase;
// CachedImageFetcher takes care of fetching images from the network and caching
// them in the database.
class CachedImageFetcher {
public:
// |pref_service| and |database| need to outlive the created image fetcher
// instance.
CachedImageFetcher(std::unique_ptr<image_fetcher::ImageFetcher> image_fetcher,
PrefService* pref_service,
RemoteSuggestionsDatabase* database);
virtual ~CachedImageFetcher();
// Fetches the image for a suggestion. The fetcher will first issue a lookup
// to the underlying cache with a fallback to the network.
virtual void FetchSuggestionImage(
const ContentSuggestion::ID& suggestion_id,
const GURL& image_url,
ImageDataFetchedCallback image_data_callback,
ImageFetchedCallback image_callback);
private:
void OnImageDataFetched(const std::string& id_within_category,
const std::string& image_data,
const image_fetcher::RequestMetadata& metadata);
void OnImageDecodingDone(ImageFetchedCallback callback,
const std::string& id_within_category,
const gfx::Image& image,
const image_fetcher::RequestMetadata& metadata);
void OnImageFetchingDone(ImageFetchedCallback callback,
const gfx::Image& image,
const image_fetcher::RequestMetadata& metadata);
void OnImageFetchedFromDatabase(
ImageDataFetchedCallback image_data_callback,
ImageFetchedCallback image_callback,
const ContentSuggestion::ID& suggestion_id,
const GURL& image_url,
// SnippetImageCallback requires by-value (not const ref).
std::string data);
void OnImageDecodedFromDatabase(ImageFetchedCallback callback,
const ContentSuggestion::ID& suggestion_id,
const GURL& url,
const gfx::Image& image);
void FetchImageFromNetwork(const ContentSuggestion::ID& suggestion_id,
const GURL& url,
ImageDataFetchedCallback image_data_callback,
ImageFetchedCallback image_callback);
void SaveImageAndInvokeDataCallback(
const std::string& id_within_category,
ImageDataFetchedCallback callback,
const std::string& image_data,
const image_fetcher::RequestMetadata& request_metadata);
std::unique_ptr<image_fetcher::ImageFetcher> image_fetcher_;
RemoteSuggestionsDatabase* database_;
// Request throttler for limiting requests to thumbnail images.
RequestThrottler thumbnail_requests_throttler_;
base::WeakPtrFactory<CachedImageFetcher> weak_ptr_factory_{this};
DISALLOW_COPY_AND_ASSIGN(CachedImageFetcher);
};
} // namespace ntp_snippets
#endif // COMPONENTS_NTP_SNIPPETS_REMOTE_CACHED_IMAGE_FETCHER_H_
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