lbcd/claimtrie/chain/chainrepo/pebble.go
Roy Lee ccaa6dd816 [lbry] claimtrie: import current snapshot
Sync to tip

Co-authored-by: Brannon King <countprimes@gmail.com>
2021-07-08 10:41:12 -07:00

91 lines
1.6 KiB
Go

package chainrepo
import (
"bytes"
"encoding/binary"
"fmt"
"github.com/btcsuite/btcd/claimtrie/change"
"github.com/vmihailenco/msgpack/v5"
"github.com/cockroachdb/pebble"
)
type Pebble struct {
db *pebble.DB
}
func NewPebble(path string) (*Pebble, error) {
db, err := pebble.Open(path, nil)
if err != nil {
return nil, fmt.Errorf("pebble open %s, %w", path, err)
}
repo := &Pebble{db: db}
return repo, nil
}
func (repo *Pebble) Save(height int32, changes []change.Change) error {
if len(changes) == 0 {
return nil
}
key := bytes.NewBuffer(nil)
err := binary.Write(key, binary.BigEndian, height)
if err != nil {
return fmt.Errorf("pebble prepare key: %w", err)
}
value, err := msgpack.Marshal(changes)
if err != nil {
return fmt.Errorf("pebble msgpack marshal: %w", err)
}
err = repo.db.Set(key.Bytes(), value, pebble.NoSync)
if err != nil {
return fmt.Errorf("pebble set: %w", err)
}
return nil
}
func (repo *Pebble) Load(height int32) ([]change.Change, error) {
key := bytes.NewBuffer(nil)
err := binary.Write(key, binary.BigEndian, height)
if err != nil {
return nil, fmt.Errorf("pebble prepare key: %w", err)
}
b, closer, err := repo.db.Get(key.Bytes())
if err != nil {
return nil, err
}
defer closer.Close()
var changes []change.Change
err = msgpack.Unmarshal(b, &changes)
if err != nil {
return nil, fmt.Errorf("pebble msgpack marshal: %w", err)
}
return changes, nil
}
func (repo *Pebble) Close() error {
err := repo.db.Flush()
if err != nil {
return fmt.Errorf("pebble fludh: %w", err)
}
err = repo.db.Close()
if err != nil {
return fmt.Errorf("pebble close: %w", err)
}
return nil
}