Migrate to external Donut package

pkg/storage/donut/interfaces.go

@@ -1,51 +0,0 @@
-package donut
-
-import (
-	"io"
-)
-
-// Collection of Donut specification interfaces
-
-// Donut interface
-type Donut interface {
-	CreateBucket(bucket string) error
-	GetObjectReader(bucket, object string) (io.ReadCloser, error)
-	GetObjectWriter(bucket, object string) (ObjectWriter, error)
-	GetObjectMetadata(bucket, object string) (map[string]string, error)
-	ListBuckets() ([]string, error)
-	ListObjects(bucket string) ([]string, error)
-}
-
-// Bucket interface
-type Bucket interface {
-	GetNodes() ([]string, error)
-	AddNode(nodeID, bucketID string) error
-}
-
-// Node interface
-type Node interface {
-	CreateBucket(bucket string) error
-	GetBuckets() ([]string, error)
-	GetDonutMetadata(bucket, object string) (map[string]string, error)
-	GetMetadata(bucket, object string) (map[string]string, error)
-	GetReader(bucket, object string) (io.ReadCloser, error)
-	GetWriter(bucket, object string) (Writer, error)
-	ListObjects(bucket string) ([]string, error)
-}
-
-// ObjectWriter interface
-type ObjectWriter interface {
-	Close() error
-	CloseWithError(error) error
-	GetMetadata() (map[string]string, error)
-	SetMetadata(map[string]string) error
-	Write([]byte) (int, error)
-}
-
-// Writer interface
-type Writer interface {
-	ObjectWriter
-
-	GetDonutMetadata() (map[string]string, error)
-	SetDonutMetadata(map[string]string) error
-}