package main

import (

"context"

"encoding/hex"

"os"

"path"

altda "github.com/ethereum-optimism/optimism/op-alt-da"

)

type FileStore struct {

directory string

}

func NewFileStore(directory string) *FileStore {

return &FileStore{

directory: directory,

}

}

func (s *FileStore) Get(ctx context.Context, key []byte) ([]byte, error) {

data, err := os.ReadFile(s.fileName(key))

if err != nil {

if os.IsNotExist(err) {

return nil, altda.ErrNotFound

}

return nil, err

}

return data, nil

}

func (s *FileStore) Put(ctx context.Context, key []byte, value []byte) error {

return os.WriteFile(s.fileName(key), value, 0600)

}

func (s *FileStore) fileName(key []byte) string {

return path.Join(s.directory, hex.EncodeToString(key))

}