storage: filesystem iter implementation

Author: mcuadros

core/storage.go

@@ -16,13 +16,6 @@ type ObjectStorage interface {
 	// NewObject returns a new Object, the real type of the object can be a
 	// custom implementation or the defaul one, MemoryObject
 	NewObject() Object
-	// Writer retuns a writer for writing a packfile to the Storage, this method
-	// is optional, if not implemented the ObjectStorage should return a
-	// ErrNotImplemented error.
-	//
-	// If the implementation not implements Writer the objects should be written
-	// using the Set method.
-	Writer() (io.WriteCloser, error)
 	// Set save an object into the storage, the object shuld be create with
 	// the NewObject, method, and file if the type is not supported.
 	Set(Object) (Hash, error)
@@ -43,6 +36,18 @@ type ObjectStorage interface {
 	Begin() TxObjectStorage
 }
 
+// ObjectStorageWrite is a optional method for ObjectStorage, it enable direct
+// write of packfile to the storage
+type ObjectStorageWrite interface {
+	// Writer retuns a writer for writing a packfile to the Storage, this method
+	// is optional, if not implemented the ObjectStorage should return a
+	// ErrNotImplemented error.
+	//
+	// If the implementation not implements Writer the objects should be written
+	// using the Set method.
+	Writer() (io.WriteCloser, error)
+}
+
 // ObjectIter is a generic closable interface for iterating over objects.
 type ObjectIter interface {
 	Next() (Object, error)