forked from TrueCloudLab/neoneo-go
123 lines
2.7 KiB
Go
123 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/iterator"
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"github.com/syndtr/goleveldb/leveldb/opt"
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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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// 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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// PutChangeSet implements the Store interface.
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func (s *LevelDBStore) PutChangeSet(puts map[string][]byte, stores map[string][]byte) 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 _, m := range []map[string][]byte{puts, stores} {
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for k := range m {
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if m[k] != nil {
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err = tx.Put([]byte(k), m[k], nil)
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} else {
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err = tx.Delete([]byte(k), nil)
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}
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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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}
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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) bool) {
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iter := s.db.NewIterator(seekRangeToPrefixes(rng), nil)
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s.seek(iter, rng.Backwards, f)
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}
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// SeekGC implements the Store interface.
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func (s *LevelDBStore) SeekGC(rng SeekRange, keep func(k, v []byte) 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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iter := tx.NewIterator(seekRangeToPrefixes(rng), nil)
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s.seek(iter, rng.Backwards, func(k, v []byte) bool {
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if !keep(k, v) {
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err = tx.Delete(k, nil)
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if err != nil {
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return false
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}
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}
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return true
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})
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if err != nil {
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return err
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}
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return tx.Commit()
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}
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func (s *LevelDBStore) seek(iter iterator.Iterator, backwards bool, f func(k, v []byte) bool) {
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var (
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next func() bool
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ok bool
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)
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if !backwards {
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ok = iter.Next()
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next = iter.Next
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} else {
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ok = iter.Last()
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next = iter.Prev
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}
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for ; ok; ok = next() {
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if !f(iter.Key(), iter.Value()) {
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break
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}
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}
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iter.Release()
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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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