robustness

type Comparer interface {
	Gather(ctx context.Context, path string, opts map[string]string) ([]byte, error)
	Compare(ctx context.Context, path string, data []byte, reportOut io.Writer, opts map[string]string) error
}

type FileWriter interface {
	// DataDirectory returns the absolute path of the data directory configured.
	DataDirectory() string

	// DeleteDirectoryContents deletes some of the content of a random directory,
	// based on its input option values (none of which are required).
	// The method returns the effective option values used and the error if any.
	// ErrNoOp is returned if no directory is found.
	DeleteDirectoryContents(opts map[string]string) (map[string]string, error)

	// DeleteEverything deletes all content.
	DeleteEverything() error

	// DeleteRandomSubdirectory deletes a random directory, based
	// on its input option values (none of which are required).
	// The method returns the effective option values used and the error if any.
	// ErrNoOp is returned if no directory is found.
	DeleteRandomSubdirectory(opts map[string]string) (map[string]string, error)

	// WriteRandomFiles writes a number of files in a random directory, based
	// on its input option values (none of which are required).
	// The method returns the effective option values used and the error if any.
	WriteRandomFiles(opts map[string]string) (map[string]string, error)
}

type Persister interface {
	Store
	LoadMetadata() error
	FlushMetadata() error
	GetPersistDir() string
}

type Snapshotter interface {
	CreateSnapshot(sourceDir string, opts map[string]string) (snapID string, err error)
	RestoreSnapshot(snapID string, restoreDir string, opts map[string]string) error
	DeleteSnapshot(snapID string, opts map[string]string) error
	RunGC(opts map[string]string) error
	ListSnapshots() ([]string, error)
}

type Store interface {
	Store(key string, val []byte) error
	Load(key string) ([]byte, error)
	Delete(key string)
}