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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_system_volumemanager_h__
#define mozilla_system_volumemanager_h__
#include <vector>
#include <queue>
#include "base/message_loop.h"
#include "mozilla/FileUtils.h"
#include "mozilla/Observer.h"
#include "nsISupportsImpl.h"
#include "nsString.h"
#include "nsTArray.h"
#include "Volume.h"
#include "VolumeCommand.h"
namespace mozilla {
namespace system {
/***************************************************************************
*
* All of the public API mentioned in this file (unless otherwise
* mentioned) must run from the IOThread.
*
***************************************************************************/
/***************************************************************************
*
* The VolumeManager class is a front-end for android's vold service.
*
* Vold uses a unix socket interface and accepts null-terminated string
* commands. The following commands were determined by examining the vold
* source code:
*
* volume list
* volume mount <volname>
* volume unmount <volname> [force]
* volume debug [on|off]
* volume format <volname>
* volume share <volname> <method>
* volume unshare <volname> <method>
* volume shared <volname> <method>
*
* <volname> is the name of the volume as used in /system/etc/vold.fstab
* <method> is ums
*
* dump
*
* share status <method> (Determines if a particular sharing method is available)
* (GB only - not available in ICS)
*
* storage users (??? always crashes vold ???)
*
* asec list
* asec ...lots more...
*
* obb list
* obb ...lots more...
*
* xwarp enable
* xwarp disable
* xwarp status
*
* There is also a command line tool called vdc, which can be used to send
* the above commands to vold.
*
* Currently, only the volume list, share/unshare, and mount/unmount
* commands are being used.
*
***************************************************************************/
class VolumeManager final : public MessageLoopForIO::LineWatcher
{
virtual ~VolumeManager();
public:
NS_INLINE_DECL_REFCOUNTING(VolumeManager)
typedef nsTArray<RefPtr<Volume>> VolumeArray;
VolumeManager();
//-----------------------------------------------------------------------
//
// State related methods.
//
// The VolumeManager starts off in the STARTING state. Once a connection
// is established with vold, it asks for a list of volumes, and once the
// volume list has been received, then the VolumeManager enters the
// VOLUMES_READY state.
//
// If vold crashes, then the VolumeManager will once again enter the
// STARTING state and try to reestablish a connection with vold.
enum STATE
{
UNINITIALIZED,
STARTING,
VOLUMES_READY
};
static STATE State();
static const char* StateStr(STATE aState);
static const char* StateStr() { return StateStr(State()); }
class StateChangedEvent
{
public:
StateChangedEvent() {}
};
typedef mozilla::Observer<StateChangedEvent> StateObserver;
typedef mozilla::ObserverList<StateChangedEvent> StateObserverList;
static void RegisterStateObserver(StateObserver* aObserver);
static void UnregisterStateObserver(StateObserver* aObserver);
//-----------------------------------------------------------------------
static void Start();
static void Dump(const char* aLabel);
static VolumeArray::size_type NumVolumes();
static already_AddRefed<Volume> GetVolume(VolumeArray::index_type aIndex);
static already_AddRefed<Volume> FindVolumeByName(const nsCSubstring& aName);
static already_AddRefed<Volume> FindAddVolumeByName(const nsCSubstring& aName);
static bool RemoveVolumeByName(const nsCSubstring& aName);
static void InitConfig();
static void PostCommand(VolumeCommand* aCommand);
protected:
virtual void OnLineRead(int aFd, nsDependentCSubstring& aMessage);
virtual void OnFileCanWriteWithoutBlocking(int aFd);
virtual void OnError();
static void DefaultConfig();
private:
bool OpenSocket();
friend class VolumeListCallback; // Calls SetState
static void SetState(STATE aNewState);
void Restart();
void WriteCommandData();
void HandleBroadcast(int aResponseCode, nsCString& aResponseLine);
typedef std::queue<RefPtr<VolumeCommand> > CommandQueue;
static STATE mState;
static StateObserverList mStateObserverList;
static const int kRcvBufSize = 1024;
ScopedClose mSocket;
VolumeArray mVolumeArray;
CommandQueue mCommands;
bool mCommandPending;
MessageLoopForIO::FileDescriptorWatcher mReadWatcher;
MessageLoopForIO::FileDescriptorWatcher mWriteWatcher;
RefPtr<VolumeResponseCallback> mBroadcastCallback;
};
/***************************************************************************
*
* The initialization/shutdown functions do not need to be called from
* the IOThread context.
*
***************************************************************************/
/**
* Initialize the Volume Manager. On initialization, the VolumeManager will
* attempt to connect with vold and collect the list of volumes that vold
* knows about.
*/
void InitVolumeManager();
/**
* Shuts down the Volume Manager.
*/
void ShutdownVolumeManager();
} // system
} // mozilla
#endif // mozilla_system_volumemanager_h__
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