store

type Checkpoint interface {
	MarshalCheckpoint() ([]byte, error)
	UnmarshalCheckpoint(blob []byte) error
	VerifyChecksum() error
}

type CheckpointManager interface {
	// CreateCheckpoint persists checkpoint in CheckpointStore. checkpointKey is the key for utilstore to locate checkpoint.
	// For file backed utilstore, checkpointKey is the file name to write the checkpoint data.
	CreateCheckpoint(checkpointKey string, checkpoint Checkpoint) error
	// GetCheckpoint retrieves checkpoint from CheckpointStore.
	GetCheckpoint(checkpointKey string, checkpoint Checkpoint) error
	// WARNING: RemoveCheckpoint will not return error if checkpoint does not exist.
	RemoveCheckpoint(checkpointKey string) error
	// ListCheckpoint returns the list of existing checkpoints.
	ListCheckpoints() ([]string, error)
}

type Checksum uint64

type DefaultFs struct{}

type File interface {
	// for now, the only os.File methods used are those below, add more as necessary
	Name() string
	Write(b []byte) (n int, err error)
	Sync() error
	Close() error
}

type FileStore struct {
	// contains filtered or unexported fields
}

type Filesystem interface {
	// from "os"
	Stat(name string) (os.FileInfo, error)
	Create(name string) (File, error)
	Rename(oldpath, newpath string) error
	MkdirAll(path string, perm os.FileMode) error
	Chtimes(name string, atime time.Time, mtime time.Time) error
	RemoveAll(path string) error
	Remove(name string) error

	// from "io/ioutil"
	ReadFile(filename string) ([]byte, error)
	TempDir(dir, prefix string) (string, error)
	TempFile(dir, prefix string) (File, error)
	ReadDir(dirname string) ([]os.FileInfo, error)
	Walk(root string, walkFn filepath.WalkFunc) error
}

type Store interface {
	// key must contain one or more characters in [A-Za-z0-9]
	// Write writes data with key.
	Write(key string, data []byte) error
	// Read retrieves data with key
	// Read must return ErrKeyNotFound if key is not found.
	Read(key string) ([]byte, error)
	// Delete deletes data by key
	// Delete must not return error if key does not exist
	Delete(key string) error
	// List lists all existing keys.
	List() ([]string, error)
}