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store.go
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store.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright © 2021 Wrangle Ltd
package objbadger
import (
"github.com/dgraph-io/badger/v3"
"github.com/wrgl/core/pkg/objects"
)
type Store struct {
db *badger.DB
}
func NewStore(db *badger.DB) *Store {
return &Store{db: db}
}
func (s *Store) Get(k []byte) ([]byte, error) {
var v []byte
err := s.db.View(func(txn *badger.Txn) error {
item, err := txn.Get(k)
if err != nil {
if err == badger.ErrKeyNotFound {
return objects.ErrKeyNotFound
}
return err
}
return item.Value(func(val []byte) error {
v = val
return nil
})
})
return v, err
}
func (s *Store) Set(k, v []byte) error {
return s.db.Update(func(txn *badger.Txn) error {
return txn.Set(k, v)
})
}
func (s *Store) Delete(k []byte) error {
return s.db.Update(func(txn *badger.Txn) error {
return txn.Delete(k)
})
}
func (s *Store) Exist(k []byte) bool {
err := s.db.View(func(txn *badger.Txn) error {
_, err := txn.Get(k)
return err
})
return err == nil
}
func (s *Store) Filter(prefix []byte) (map[string][]byte, error) {
result := map[string][]byte{}
err := s.db.View(func(txn *badger.Txn) error {
opt := badger.DefaultIteratorOptions
opt.Prefix = prefix
it := txn.NewIterator(opt)
defer it.Close()
for it.Rewind(); it.Valid(); it.Next() {
item := it.Item()
k := string(item.KeyCopy(nil))
v, err := item.ValueCopy(nil)
if err != nil {
return err
}
result[k] = v
}
return nil
})
return result, err
}
func (s *Store) FilterKey(prefix []byte) (keys [][]byte, err error) {
err = s.db.View(func(txn *badger.Txn) error {
opt := badger.DefaultIteratorOptions
opt.Prefix = prefix
it := txn.NewIterator(opt)
defer it.Close()
for it.Rewind(); it.Valid(); it.Next() {
item := it.Item()
keys = append(keys, item.KeyCopy(nil))
}
return nil
})
return
}
func (s *Store) Clear(prefix []byte) error {
return s.db.DropPrefix(prefix)
}
func (s *Store) Close() error {
return s.db.Close()
}