package cache

import (
	"bytes"

	"github.com/dgraph-io/badger/v3"
)

func (c *CacheRepository) RangePrefix(prefix string) (b []*bytes.Buffer, err error) {
	c.cache.View(func(txn *badger.Txn) error {
		it := txn.NewIterator(badger.DefaultIteratorOptions)
		defer it.Close()
		prefix := []byte(prefix)
		for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
			item := it.Item()
			err := item.Value(func(v []byte) error {
				b = append(b, bytes.NewBuffer(v))
				return nil
			})
			if err != nil {
				return err
			}
		}
		return nil
	})
	return
}