cluster

type DataNode interface {
	Create(data []byte) (string, error)
	Read(sha512Hex string, begins uint32, ends uint32, readHandler func(data []byte) error) error
	Delete(sha512Hex string) error

	HardwareId() (string, error)
	Join(clusterId string, nodeId string, masterAddress string) bool
	Mode(master bool) bool
	Leave() bool
	Wipe() bool

	SyncCreate(sha512Hex string, usage uint16, sourceNodeAddr string) error
	SyncDelete(sha512Hex string, usage uint16) error
	SyncMove(sha512Hex string, sourceNodeAddr string) error
	SyncList(snapshotTime *time.Time) (*common.SyncContainer, error)
	SyncFull(sourceNodeAddr string) bool
	SyncUsage(usageMap map[string]uint16) error

	SnapshotCreate() bool
	SnapshotDelete(snapshotIndex uint64) bool
	SnapshotRestore(snapshotIndex uint64) bool

	Ping() int64
	Size() (uint64, error)
	Used() (uint64, error)

	RequestHandshake() bool
}