forked from TrueCloudLab/neoneo-go
130 lines
3.1 KiB
Go
130 lines
3.1 KiB
Go
package storage
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import (
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"bytes"
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"fmt"
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"os"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/syndtr/goleveldb/leveldb/util"
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"go.etcd.io/bbolt"
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)
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// BoltDBOptions configuration for boltdb.
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type BoltDBOptions struct {
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FilePath string `yaml:"FilePath"`
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}
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// Bucket represents bucket used in boltdb to store all the data.
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var Bucket = []byte("DB")
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// BoltDBStore it is the storage implementation for storing and retrieving
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// blockchain data.
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type BoltDBStore struct {
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db *bbolt.DB
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}
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// NewBoltDBStore returns a new ready to use BoltDB storage with created bucket.
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func NewBoltDBStore(cfg BoltDBOptions) (*BoltDBStore, error) {
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var opts *bbolt.Options // should be exposed via BoltDBOptions if anything needed
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fileMode := os.FileMode(0600) // should be exposed via BoltDBOptions if anything needed
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fileName := cfg.FilePath
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if err := io.MakeDirForFile(fileName, "BoltDB"); err != nil {
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return nil, err
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}
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db, err := bbolt.Open(fileName, fileMode, opts)
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if err != nil {
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return nil, err
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}
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err = db.Update(func(tx *bbolt.Tx) error {
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_, err = tx.CreateBucketIfNotExists(Bucket)
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if err != nil {
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return fmt.Errorf("could not create root bucket: %w", err)
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}
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return nil
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})
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return &BoltDBStore{db: db}, nil
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}
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// Put implements the Store interface.
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func (s *BoltDBStore) Put(key, value []byte) error {
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return s.db.Update(func(tx *bbolt.Tx) error {
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b := tx.Bucket(Bucket)
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err := b.Put(key, value)
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return err
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})
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}
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// Get implements the Store interface.
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func (s *BoltDBStore) Get(key []byte) (val []byte, err error) {
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err = s.db.View(func(tx *bbolt.Tx) error {
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b := tx.Bucket(Bucket)
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val = b.Get(key)
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// Value from Get is only valid for the lifetime of transaction, #1482
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if val != nil {
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var valcopy = make([]byte, len(val))
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copy(valcopy, val)
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val = valcopy
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}
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return nil
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})
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if val == nil {
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err = ErrKeyNotFound
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}
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return
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}
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// Delete implements the Store interface.
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func (s *BoltDBStore) Delete(key []byte) error {
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return s.db.Update(func(tx *bbolt.Tx) error {
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b := tx.Bucket(Bucket)
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return b.Delete(key)
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})
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}
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// PutBatch implements the Store interface.
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func (s *BoltDBStore) PutBatch(batch Batch) error {
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return s.db.Batch(func(tx *bbolt.Tx) error {
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b := tx.Bucket(Bucket)
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for k, v := range batch.(*MemoryBatch).mem {
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err := b.Put([]byte(k), v)
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if err != nil {
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return err
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}
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}
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for k := range batch.(*MemoryBatch).del {
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err := b.Delete([]byte(k))
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if err != nil {
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return err
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}
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}
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return nil
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})
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}
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// Seek implements the Store interface.
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func (s *BoltDBStore) Seek(key []byte, f func(k, v []byte)) {
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err := s.db.View(func(tx *bbolt.Tx) error {
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c := tx.Bucket(Bucket).Cursor()
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prefix := util.BytesPrefix(key)
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for k, v := c.Seek(prefix.Start); k != nil && bytes.Compare(k, prefix.Limit) <= 0; k, v = c.Next() {
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f(k, v)
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}
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return nil
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})
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if err != nil {
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panic(err)
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}
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}
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// Batch implements the Batch interface and returns a boltdb
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// compatible Batch.
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func (s *BoltDBStore) Batch() Batch {
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return newMemoryBatch()
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}
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// Close releases all db resources.
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func (s *BoltDBStore) Close() error {
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return s.db.Close()
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}
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