264dfef370
add close function to storage interface add common defer function call which will close db connection remove context as soon as it's not needed anymore updated unit tests
129 lines
3 KiB
Go
129 lines
3 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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"path"
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"github.com/etcd-io/bbolt"
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"github.com/syndtr/goleveldb/leveldb/util"
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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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// BoltDBBatch simple batch implementation to satisfy the Store interface.
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type BoltDBBatch struct {
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mem map[*[]byte][]byte
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}
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// Len implements the Batch interface.
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func (b *BoltDBBatch) Len() int {
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return len(b.mem)
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}
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// Put implements the Batch interface.
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func (b *BoltDBBatch) Put(k, v []byte) {
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b.mem[&k] = v
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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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dir := path.Dir(fileName)
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err := os.MkdirAll(dir, os.ModePerm)
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if err != nil {
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return nil, fmt.Errorf("could not create dir for BoltDB: %v", 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: %v", 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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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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// 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.(*BoltDBBatch).mem {
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err := b.Put(*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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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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fmt.Println("error while executing seek in boltDB")
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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 &BoltDBBatch{
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mem: make(map[*[]byte][]byte),
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}
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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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