forked from TrueCloudLab/neoneo-go
288000a8af
golint suggests: Line 24: warning: should drop = nil from declaration of var opts; it is the zero value (golint)
80 lines
2 KiB
Go
80 lines
2 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/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 return 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 *opt.Options // should be exposed via LevelDBOptions if anything needed
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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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// Seek implements the Store interface.
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func (s *LevelDBStore) Seek(key []byte, f func(k, v []byte)) {
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iter := s.db.NewIterator(util.BytesPrefix(key), 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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