91 lines
1.8 KiB
Go
91 lines
1.8 KiB
Go
package reveil
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import (
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"encoding/json"
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"fmt"
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"log"
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"math/rand"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/errors"
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"github.com/syndtr/goleveldb/leveldb/iterator"
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"github.com/syndtr/goleveldb/leveldb/util"
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)
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type LevelDBStorage struct {
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db *leveldb.DB
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}
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// NewMySQLStorage establishes the connection to the database
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func NewLevelDBStorage(path string) (s *LevelDBStorage, err error) {
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var db *leveldb.DB
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db, err = leveldb.OpenFile(path, nil)
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if err != nil {
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if _, ok := err.(*errors.ErrCorrupted); ok {
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log.Println("LevelDB was corrupted; attempting recovery (%s)", err.Error())
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_, err = leveldb.RecoverFile(path, nil)
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if err != nil {
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return
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}
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log.Println("LevelDB recovery succeeded!")
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} else {
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return
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}
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}
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s = &LevelDBStorage{db}
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return
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}
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func (s *LevelDBStorage) Close() error {
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return s.db.Close()
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}
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func decodeData(data []byte, v interface{}) error {
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return json.Unmarshal(data, v)
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}
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func (s *LevelDBStorage) get(key string, v interface{}) error {
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data, err := s.db.Get([]byte(key), nil)
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if err != nil {
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return err
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}
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return decodeData(data, v)
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}
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func (s *LevelDBStorage) put(key string, v interface{}) error {
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data, err := json.Marshal(v)
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if err != nil {
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return err
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}
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return s.db.Put([]byte(key), data, nil)
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}
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func (s *LevelDBStorage) findBytesKey(prefix string, len int) (key string, id Identifier, err error) {
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id = make([]byte, len)
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found := true
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for found {
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if _, err = rand.Read(id); err != nil {
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return
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}
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key = fmt.Sprintf("%s%s", prefix, id.ToString())
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found, err = s.db.Has([]byte(key), nil)
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if err != nil {
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return
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}
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}
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return
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}
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func (s *LevelDBStorage) delete(key string) error {
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return s.db.Delete([]byte(key), nil)
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}
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func (s *LevelDBStorage) search(prefix string) iterator.Iterator {
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return s.db.NewIterator(util.BytesPrefix([]byte(prefix)), nil)
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}
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