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leveldb_store.go
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leveldb_store.go
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package storage
import (
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/filter"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/util"
)
// LevelDBOptions configuration for LevelDB.
type LevelDBOptions struct {
DataDirectoryPath string `yaml:"DataDirectoryPath"`
}
// LevelDBStore is the official storage implementation for storing and retrieving
// blockchain data.
type LevelDBStore struct {
db *leveldb.DB
path string
}
// NewLevelDBStore returns a new LevelDBStore object that will
// initialize the database found at the given path.
func NewLevelDBStore(cfg LevelDBOptions) (*LevelDBStore, error) {
var opts = new(opt.Options) // should be exposed via LevelDBOptions if anything needed
opts.Filter = filter.NewBloomFilter(10)
db, err := leveldb.OpenFile(cfg.DataDirectoryPath, opts)
if err != nil {
return nil, err
}
return &LevelDBStore{
path: cfg.DataDirectoryPath,
db: db,
}, nil
}
// Put implements the Store interface.
func (s *LevelDBStore) Put(key, value []byte) error {
return s.db.Put(key, value, nil)
}
// Get implements the Store interface.
func (s *LevelDBStore) Get(key []byte) ([]byte, error) {
value, err := s.db.Get(key, nil)
if err == leveldb.ErrNotFound {
err = ErrKeyNotFound
}
return value, err
}
// Delete implements the Store interface.
func (s *LevelDBStore) Delete(key []byte) error {
return s.db.Delete(key, nil)
}
// PutBatch implements the Store interface.
func (s *LevelDBStore) PutBatch(batch Batch) error {
lvldbBatch := batch.(*leveldb.Batch)
return s.db.Write(lvldbBatch, nil)
}
// Seek implements the Store interface.
func (s *LevelDBStore) Seek(key []byte, f func(k, v []byte)) {
iter := s.db.NewIterator(util.BytesPrefix(key), nil)
for iter.Next() {
f(iter.Key(), iter.Value())
}
iter.Release()
}
// Batch implements the Batch interface and returns a leveldb
// compatible Batch.
func (s *LevelDBStore) Batch() Batch {
return new(leveldb.Batch)
}
// Close implements the Store interface.
func (s *LevelDBStore) Close() error {
return s.db.Close()
}