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// Copyright 2014 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 CHROME_BROWSER_CHROMEOS_CUSTOMIZATION_WALLPAPER_DOWNLOADER_H_
#define CHROME_BROWSER_CHROMEOS_CUSTOMIZATION_WALLPAPER_DOWNLOADER_H_
#include <string>
#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "url/gurl.h"
namespace net {
class URLRequestContextGetter;
} // namespace net
namespace chromeos {
// Download customized wallpaper.
// Owner of this class must provide callback, which will be called on
// finished (either successful or failed) wallpaper download.
class CustomizationWallpaperDownloader : public net::URLFetcherDelegate {
public:
// - |url_context_getter| - Context to initialize net::URLFetcher.
// - |wallpaper_url| - wallpaper URL to download.
// - |wallpaper_dir| - directory, where wallpaper will be downloaded
// (it will be created).
// - |wallpaper_downloaded_file| - full path to local file to store downloaded
// wallpaper file. File is downloaded to temporary location
// |wallpaper_downloaded_file| + ".tmp", so directory must be writable.
// After download is completed, temporary file will be renamed to
// |wallpaper_downloaded_file|.
CustomizationWallpaperDownloader(
net::URLRequestContextGetter* url_context_getter,
const GURL& wallpaper_url,
const base::FilePath& wallpaper_dir,
const base::FilePath& wallpaper_downloaded_file,
base::Callback<void(bool success, const GURL&)>
on_wallpaper_fetch_completed);
virtual ~CustomizationWallpaperDownloader();
// Start download.
void Start();
// net::URLFetcherDelegate
virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
// This is called in tests to modify (lower) retry delay.
void set_retry_delay_for_testing(base::TimeDelta value) {
retry_delay_ = value;
}
base::TimeDelta retry_current_delay_for_testing() const {
return retry_current_delay_;
}
private:
// Start new request.
void StartRequest();
// Schedules retry.
void Retry();
// Called on UI thread.
void OnWallpaperDirectoryCreated(scoped_ptr<bool> success);
// Called on UI thread.
void OnTemporaryFileRenamed(scoped_ptr<bool> success);
// This is used to initialize net::URLFetcher object.
scoped_refptr<net::URLRequestContextGetter> url_context_getter_;
// This fetcher is used to download wallpaper file.
scoped_ptr<net::URLFetcher> url_fetcher_;
// The wallpaper URL to fetch.
const GURL wallpaper_url_;
// Wallpaper directory (to be created).
const base::FilePath wallpaper_dir_;
// Full path to local file to save downloaded wallpaper.
const base::FilePath wallpaper_downloaded_file_;
// Full path to temporary file to fetch downloaded wallpper.
const base::FilePath wallpaper_temporary_file_;
// Pending retry.
base::OneShotTimer<CustomizationWallpaperDownloader> request_scheduled_;
// Number of download retries (first attempt is not counted as retry).
size_t retries_;
// Sleep between retry requests (increasing, see Retry() method for details).
// Non-constant value for tests.
base::TimeDelta retry_delay_;
// Retry delay of the last attempt. For testing only.
base::TimeDelta retry_current_delay_;
// Callback supplied by caller.
base::Callback<void(bool success, const GURL&)> on_wallpaper_fetch_completed_;
base::WeakPtrFactory<CustomizationWallpaperDownloader> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(CustomizationWallpaperDownloader);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_CUSTOMIZATION_WALLPAPER_DOWNLOADER_H_
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