donut

type Bucket interface {
	GetBucketName() string

	ListNodes() (map[string]Node, error)
	ListObjects() (map[string]Object, error)

	GetObject(object string, writer *io.PipeWriter, donutObjectMetadata map[string]string)
	PutObject(object string, contents io.Reader) error

	WriteDonutObjectMetadata(object string, donutMetadata map[string]string) error
	WriteObjectMetadata(object string, objectMetadata map[string]string) error
}

type Disk interface {
	MakeDir(dirname string) error

	ListDir(dirname string) ([]os.FileInfo, error)
	ListFiles(dirname string) ([]os.FileInfo, error)

	MakeFile(path string) (*os.File, error)
	OpenFile(path string) (*os.File, error)

	GetName() string
	GetOrder() int
	GetFileSystemType() string
	SaveConfig() ([]byte, error)
	LoadConfig([]byte) error
}

type Donut interface {
	MakeBucket(bucket string) error
	ListBuckets() (map[string]Bucket, error)

	Heal() error
	Rebalance() error
	Info() error

	AttachNode(node Node) error
	DetachNode(node Node) error

	SaveConfig() ([]byte, error)
	LoadConfig([]byte) error
}

type Encoder interface {
	GetEncodedBlockLen(dataLength int) (int, error)
	Encode(data []byte) (encodedData [][]byte, err error)
	Decode(encodedData [][]byte, dataLength int) (data []byte, err error)
}

type Node interface {
	ListDisks() (map[string]Disk, error)
	AttachDisk(disk Disk) error
	DetachDisk(disk Disk) error

	GetNodeName() string
	SaveConfig() ([]byte, error)
	LoadConfig([]byte) error
}

type Object interface {
	GetObjectName() string
	GetObjectMetadata() (map[string]string, error)
	GetDonutObjectMetadata() (map[string]string, error)
}