forked from TrueCloudLab/neoneo-go
110 lines
2.7 KiB
Go
110 lines
2.7 KiB
Go
package storage
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import (
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/filter"
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"github.com/syndtr/goleveldb/leveldb/opt"
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"github.com/syndtr/goleveldb/leveldb/util"
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)
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// LevelDBOptions configuration for LevelDB.
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type LevelDBOptions struct {
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DataDirectoryPath string `yaml:"DataDirectoryPath"`
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}
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// LevelDBStore is the official storage implementation for storing and retrieving
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// blockchain data.
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type LevelDBStore struct {
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db *leveldb.DB
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path string
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}
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// NewLevelDBStore returns a new LevelDBStore object that will
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// initialize the database found at the given path.
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func NewLevelDBStore(cfg LevelDBOptions) (*LevelDBStore, error) {
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var opts = new(opt.Options) // should be exposed via LevelDBOptions if anything needed
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opts.Filter = filter.NewBloomFilter(10)
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db, err := leveldb.OpenFile(cfg.DataDirectoryPath, opts)
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if err != nil {
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return nil, err
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}
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return &LevelDBStore{
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path: cfg.DataDirectoryPath,
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db: db,
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}, nil
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}
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// Put implements the Store interface.
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func (s *LevelDBStore) Put(key, value []byte) error {
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return s.db.Put(key, value, nil)
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}
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// Get implements the Store interface.
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func (s *LevelDBStore) Get(key []byte) ([]byte, error) {
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value, err := s.db.Get(key, nil)
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if err == leveldb.ErrNotFound {
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err = ErrKeyNotFound
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}
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return value, err
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}
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// Delete implements the Store interface.
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func (s *LevelDBStore) Delete(key []byte) error {
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return s.db.Delete(key, nil)
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}
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// PutBatch implements the Store interface.
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func (s *LevelDBStore) PutBatch(batch Batch) error {
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lvldbBatch := batch.(*leveldb.Batch)
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return s.db.Write(lvldbBatch, nil)
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}
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// PutChangeSet implements the Store interface.
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func (s *LevelDBStore) PutChangeSet(puts map[string][]byte, dels map[string]bool) error {
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tx, err := s.db.OpenTransaction()
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if err != nil {
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return err
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}
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for k := range puts {
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err = tx.Put([]byte(k), puts[k], nil)
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if err != nil {
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tx.Discard()
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return err
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}
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}
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for k := range dels {
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err = tx.Delete([]byte(k), nil)
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if err != nil {
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tx.Discard()
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return err
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}
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}
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return tx.Commit()
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}
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// Seek implements the Store interface.
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func (s *LevelDBStore) Seek(rng SeekRange, f func(k, v []byte)) {
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start := make([]byte, len(rng.Prefix)+len(rng.Start))
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copy(start, rng.Prefix)
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copy(start[len(rng.Prefix):], rng.Start)
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prefix := util.BytesPrefix(rng.Prefix)
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prefix.Start = start
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iter := s.db.NewIterator(prefix, nil)
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for iter.Next() {
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f(iter.Key(), iter.Value())
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}
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iter.Release()
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}
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// Batch implements the Batch interface and returns a leveldb
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// compatible Batch.
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func (s *LevelDBStore) Batch() Batch {
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return new(leveldb.Batch)
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}
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// Close implements the Store interface.
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func (s *LevelDBStore) Close() error {
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return s.db.Close()
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}
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