chromeos/dbus/cros_disks_client.h

// Copyright (c) 2012 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 CHROMEOS_DBUS_CROS_DISKS_CLIENT_H_
#define CHROMEOS_DBUS_CROS_DISKS_CLIENT_H_

#include <string>
#include <vector>

#include "base/basictypes.h"
#include "base/callback.h"
#include "chromeos/chromeos_export.h"
#include "chromeos/dbus/dbus_client_implementation_type.h"

namespace dbus {
class Bus;
class Response;
}

namespace chromeos {

// Enum describing types of mount used by cros-disks.
enum MountType {
  MOUNT_TYPE_INVALID,
  MOUNT_TYPE_DEVICE,
  MOUNT_TYPE_ARCHIVE,
  MOUNT_TYPE_GDATA,
  MOUNT_TYPE_NETWORK_STORAGE,
};

// Type of device.
enum DeviceType {
  DEVICE_TYPE_UNKNOWN,
  DEVICE_TYPE_USB,  // USB stick.
  DEVICE_TYPE_SD,  // SD card.
  DEVICE_TYPE_OPTICAL_DISC,  // e.g. Optical disc excluding DVD.
  DEVICE_TYPE_MOBILE,  // Storage on a mobile device (e.g. Android).
  DEVICE_TYPE_DVD,  // DVD.
};

// Mount error code used by cros-disks.
enum MountError {
  MOUNT_ERROR_NONE = 0,
  MOUNT_ERROR_UNKNOWN = 1,
  MOUNT_ERROR_INTERNAL = 2,
  MOUNT_ERROR_UNKNOWN_FILESYSTEM = 101,
  MOUNT_ERROR_UNSUPPORTED_FILESYSTEM = 102,
  MOUNT_ERROR_INVALID_ARCHIVE = 201,
  MOUNT_ERROR_NOT_AUTHENTICATED = 601,
  MOUNT_ERROR_PATH_UNMOUNTED = 901,
  // TODO(tbarzic): Add more error codes as they get added to cros-disks and
  // consider doing explicit translation from cros-disks error_types.
};

// Event type each corresponding to a signal sent from cros-disks.
enum MountEventType {
  DISK_ADDED,
  DISK_REMOVED,
  DISK_CHANGED,
  DEVICE_ADDED,
  DEVICE_REMOVED,
  DEVICE_SCANNED,
  FORMATTING_FINISHED,
};

// A class to represent information about a disk sent from cros-disks.
class DiskInfo {
 public:
  DiskInfo(const std::string& device_path, dbus::Response* response);
  ~DiskInfo();

  // Device path. (e.g. /sys/devices/pci0000:00/.../8:0:0:0/block/sdb/sdb1)
  std::string device_path() const { return device_path_; }

  // Disk mount path. (e.g. /media/removable/VOLUME)
  std::string mount_path() const { return mount_path_; }

  // Disk system path given by udev.
  // (e.g. /sys/devices/pci0000:00/.../8:0:0:0/block/sdb/sdb1)
  std::string system_path() const { return system_path_; }

  // Is a drive or not. (i.e. true with /dev/sdb, false with /dev/sdb1)
  bool is_drive() const { return is_drive_; }

  // Does the disk have media content.
  bool has_media() const { return has_media_; }

  // Is the disk on deveice we booted the machine from.
  bool on_boot_device() const { return on_boot_device_; }

  // Disk file path (e.g. /dev/sdb).
  std::string file_path() const { return file_path_; }

  // Disk label.
  std::string label() const { return label_; }

  // Disk model. (e.g. "TransMemory")
  std::string drive_label() const { return drive_model_; }

  // Device type. Not working well, yet.
  DeviceType device_type() const { return device_type_; }

  // Total size of the disk in bytes.
  uint64 total_size_in_bytes() const { return total_size_in_bytes_; }

  // Is the device read-only.
  bool is_read_only() const { return is_read_only_; }

  // Returns true if the device should be hidden from the file browser.
  bool is_hidden() const { return is_hidden_; }

  // Returns file system uuid.
  std::string uuid() const { return uuid_; }

 private:
  void InitializeFromResponse(dbus::Response* response);

  std::string device_path_;
  std::string mount_path_;
  std::string system_path_;
  bool is_drive_;
  bool has_media_;
  bool on_boot_device_;

  std::string file_path_;
  std::string label_;
  std::string drive_model_;
  DeviceType device_type_;
  uint64 total_size_in_bytes_;
  bool is_read_only_;
  bool is_hidden_;
  std::string uuid_;
};

// A class to make the actual DBus calls for cros-disks service.
// This class only makes calls, result/error handling should be done
// by callbacks.
class CHROMEOS_EXPORT CrosDisksClient {
 public:
  // A callback to be called when DBus method call fails.
  typedef base::Callback<void()> ErrorCallback;

  // A callback to handle the result of Mount.
  typedef base::Callback<void()> MountCallback;

  // A callback to handle the result of Unmount.
  // The argument is the device path.
  typedef base::Callback<void(const std::string&)> UnmountCallback;

  // A callback to handle the result of EnumerateAutoMountableDevices.
  // The argument is the enumerated device paths.
  typedef base::Callback<void(const std::vector<std::string>&)
                         > EnumerateAutoMountableDevicesCallback;

  // A callback to handle the result of FormatDevice.
  // The first argument is the device path.
  // The second argument is true when formatting succeeded, false otherwise.
  typedef base::Callback<void(const std::string&, bool)> FormatDeviceCallback;

  // A callback to handle the result of GetDeviceProperties.
  // The argument is the information about the specified device.
  typedef base::Callback<void(const DiskInfo&)> GetDevicePropertiesCallback;

  // A callback to handle MountCompleted signal.
  // The first argument is the error code.
  // The second argument is the source path.
  // The third argument is the mount type.
  // The fourth argument is the mount path.
  typedef base::Callback<void(MountError, const std::string&, MountType,
                              const std::string&)> MountCompletedHandler;

  // A callback to handle mount events.
  // The first argument is the event type.
  // The second argument is the device path.
  typedef base::Callback<void(MountEventType, const std::string&)
                         > MountEventHandler;

  virtual ~CrosDisksClient();

  // Calls Mount method.  |callback| is called after the method call succeeds,
  // otherwise, |error_callback| is called.
  // When mounting an archive, caller may set two optional arguments:
  // - The |source_format| argument passes the file extension (with the leading
  //   dot, for example ".zip"). If |source_format| is empty then the source
  //   format is auto-detected.
  // - The |mount_label| argument passes an optional mount label to be used as
  //   the directory name of the mount point. If |mount_label| is empty, the
  //   mount label will be based on the |source_path|.
  virtual void Mount(const std::string& source_path,
                     const std::string& source_format,
                     const std::string& mount_label,
                     MountType type,
                     const MountCallback& callback,
                     const ErrorCallback& error_callback) = 0;

  // Calls Unmount method.  |callback| is called after the method call succeeds,
  // otherwise, |error_callback| is called.
  virtual void Unmount(const std::string& device_path,
                       const UnmountCallback& callback,
                       const ErrorCallback& error_callback) = 0;

  // Calls EnumerateAutoMountableDevices method.  |callback| is called after the
  // method call succeeds, otherwise, |error_callback| is called.
  virtual void EnumerateAutoMountableDevices(
      const EnumerateAutoMountableDevicesCallback& callback,
      const ErrorCallback& error_callback) = 0;

  // Calls FormatDevice method.  |callback| is called after the method call
  // succeeds, otherwise, |error_callback| is called.
  virtual void FormatDevice(const std::string& device_path,
                            const std::string& filesystem,
                            const FormatDeviceCallback& callback,
                            const ErrorCallback& error_callback) = 0;

  // Calls GetDeviceProperties method.  |callback| is called after the method
  // call succeeds, otherwise, |error_callback| is called.
  virtual void GetDeviceProperties(const std::string& device_path,
                                   const GetDevicePropertiesCallback& callback,
                                   const ErrorCallback& error_callback) = 0;

  // Registers given callback for events.
  // |mount_event_handler| is called when mount event signal is received.
  // |mount_completed_handler| is called when MountCompleted signal is received.
  virtual void SetUpConnections(
      const MountEventHandler& mount_event_handler,
      const MountCompletedHandler& mount_completed_handler) = 0;

  // Factory function, creates a new instance and returns ownership.
  // For normal usage, access the singleton via DBusThreadManager::Get().
  static CrosDisksClient* Create(DBusClientImplementationType type,
                                 dbus::Bus* bus);

 protected:
  // Create() should be used instead.
  CrosDisksClient();

 private:
  DISALLOW_COPY_AND_ASSIGN(CrosDisksClient);
};

}  // namespace chromeos

#endif  // CHROMEOS_DBUS_CROS_DISKS_CLIENT_H_