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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_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_
#define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_
#include <string>
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "chrome/browser/chromeos/file_system_provider/abort_callback.h"
#include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
#include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
#include "chrome/browser/chromeos/file_system_provider/provided_file_system_observer.h"
#include "chrome/browser/chromeos/file_system_provider/request_manager.h"
#include "storage/browser/fileapi/async_file_util.h"
#include "storage/browser/fileapi/watcher_manager.h"
#include "url/gurl.h"
class Profile;
namespace net {
class IOBuffer;
} // namespace net
namespace base {
class FilePath;
} // namespace base
namespace extensions {
class EventRouter;
} // namespace extensions
namespace chromeos {
namespace file_system_provider {
class NotificationManagerInterface;
// Automatically calls the |update_callback| after all of the callbacks created
// with |CreateCallback| are called.
//
// It's used to update tags of watchers once a notification about a change is
// handled. It is to make sure that the change notification is fully handled
// before remembering the new tag.
//
// It is necessary to update the tag after all observers handle it fully, so
// in case of shutdown or a crash we get the notifications again.
class AutoUpdater : public base::RefCounted<AutoUpdater> {
public:
explicit AutoUpdater(const base::Closure& update_callback);
// Creates a new callback which needs to be called before the update callback
// is called.
base::Closure CreateCallback();
private:
friend class base::RefCounted<AutoUpdater>;
// Called once the callback created with |CreateCallback| is executed. Once
// all of such callbacks are called, then the update callback is invoked.
void OnPendingCallback();
virtual ~AutoUpdater();
base::Closure update_callback_;
int created_callbacks_;
int pending_callbacks_;
};
// Provided file system implementation. Forwards requests between providers and
// clients.
class ProvidedFileSystem : public ProvidedFileSystemInterface {
public:
ProvidedFileSystem(Profile* profile,
const ProvidedFileSystemInfo& file_system_info);
virtual ~ProvidedFileSystem();
// Sets a custom event router. Used in unit tests to mock out the real
// extension.
void SetEventRouterForTesting(extensions::EventRouter* event_router);
// Sets a custom notification manager. It will recreate the request manager,
// so is must be called just after creating ProvideFileSystem instance.
// Used by unit tests.
void SetNotificationManagerForTesting(
scoped_ptr<NotificationManagerInterface> notification_manager);
// ProvidedFileSystemInterface overrides.
virtual AbortCallback RequestUnmount(
const storage::AsyncFileUtil::StatusCallback& callback) override;
virtual AbortCallback GetMetadata(
const base::FilePath& entry_path,
MetadataFieldMask fields,
const GetMetadataCallback& callback) override;
virtual AbortCallback ReadDirectory(
const base::FilePath& directory_path,
const storage::AsyncFileUtil::ReadDirectoryCallback& callback) override;
virtual AbortCallback OpenFile(const base::FilePath& file_path,
OpenFileMode mode,
const OpenFileCallback& callback) override;
virtual AbortCallback CloseFile(
int file_handle,
const storage::AsyncFileUtil::StatusCallback& callback) override;
virtual AbortCallback ReadFile(
int file_handle,
net::IOBuffer* buffer,
int64 offset,
int length,
const ReadChunkReceivedCallback& callback) override;
virtual AbortCallback CreateDirectory(
const base::FilePath& directory_path,
bool recursive,
const storage::AsyncFileUtil::StatusCallback& callback) override;
virtual AbortCallback DeleteEntry(
const base::FilePath& entry_path,
bool recursive,
const storage::AsyncFileUtil::StatusCallback& callback) override;
virtual AbortCallback CreateFile(
const base::FilePath& file_path,
const storage::AsyncFileUtil::StatusCallback& callback) override;
virtual AbortCallback CopyEntry(
const base::FilePath& source_path,
const base::FilePath& target_path,
const storage::AsyncFileUtil::StatusCallback& callback) override;
virtual AbortCallback MoveEntry(
const base::FilePath& source_path,
const base::FilePath& target_path,
const storage::AsyncFileUtil::StatusCallback& callback) override;
virtual AbortCallback Truncate(
const base::FilePath& file_path,
int64 length,
const storage::AsyncFileUtil::StatusCallback& callback) override;
virtual AbortCallback WriteFile(
int file_handle,
net::IOBuffer* buffer,
int64 offset,
int length,
const storage::AsyncFileUtil::StatusCallback& callback) override;
virtual AbortCallback AddWatcher(
const GURL& origin,
const base::FilePath& entry_path,
bool recursive,
bool persistent,
const storage::AsyncFileUtil::StatusCallback& callback,
const storage::WatcherManager::NotificationCallback&
notification_callback) override;
virtual void RemoveWatcher(
const GURL& origin,
const base::FilePath& entry_path,
bool recursive,
const storage::AsyncFileUtil::StatusCallback& callback) override;
virtual const ProvidedFileSystemInfo& GetFileSystemInfo() const override;
virtual RequestManager* GetRequestManager() override;
virtual Watchers* GetWatchers() override;
virtual void AddObserver(ProvidedFileSystemObserver* observer) override;
virtual void RemoveObserver(ProvidedFileSystemObserver* observer) override;
virtual void Notify(
const base::FilePath& entry_path,
bool recursive,
storage::WatcherManager::ChangeType change_type,
scoped_ptr<ProvidedFileSystemObserver::Changes> changes,
const std::string& tag,
const storage::AsyncFileUtil::StatusCallback& callback) override;
virtual base::WeakPtr<ProvidedFileSystemInterface> GetWeakPtr() override;
private:
// Aborts an operation executed with a request id equal to
// |operation_request_id|. The request is removed immediately on the C++ side
// despite being handled by the providing extension or not.
void Abort(int operation_request_id,
const storage::AsyncFileUtil::StatusCallback& callback);
// Called when adding a watcher is completed with either success or en error.
void OnAddWatcherCompleted(
const base::FilePath& entry_path,
bool recursive,
const Subscriber& subscriber,
const storage::AsyncFileUtil::StatusCallback& callback,
base::File::Error result);
// Called when all observers finished handling the change notification. It
// updates the tag to |tag| for the entry at |entry_path|.
void OnNotifyCompleted(
const base::FilePath& entry_path,
bool recursive,
storage::WatcherManager::ChangeType change_type,
scoped_ptr<ProvidedFileSystemObserver::Changes> changes,
const std::string& tag,
const storage::AsyncFileUtil::StatusCallback& callback);
Profile* profile_; // Not owned.
extensions::EventRouter* event_router_; // Not owned. May be NULL.
ProvidedFileSystemInfo file_system_info_;
scoped_ptr<NotificationManagerInterface> notification_manager_;
scoped_ptr<RequestManager> request_manager_;
Watchers watchers_;
ObserverList<ProvidedFileSystemObserver> observers_;
base::WeakPtrFactory<ProvidedFileSystem> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ProvidedFileSystem);
};
} // namespace file_system_provider
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_
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