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db.go
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db.go
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package txout
import (
"bytes"
"encoding/binary"
"strings"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/goleveldb/leveldb"
"github.com/btcsuite/goleveldb/leveldb/opt"
)
var (
heightKey = "height"
)
type KeyTx struct {
Key []byte
Tx *wire.TxOut
}
type DB interface {
GetHeight() (int32, error)
SetHeight(int32) error
Get(key []byte) (*wire.TxOut, error)
Put(key []byte, tx *wire.TxOut) error
PutBatch([]KeyTx) error
Close() error
}
type db struct {
ldb *leveldb.DB
}
var _ DB = (*db)(nil)
func (o *db) GetHeight() (int32, error) {
height := int64(0)
data, err := o.ldb.Get([]byte(heightKey), nil)
if err != nil {
if strings.Index(err.Error(), "not found") == -1 {
return 0, err
}
} else {
height, err = binary.ReadVarint(bytes.NewReader(data))
if err != nil {
return 0, err
}
}
return int32(height), nil
}
func (o *db) SetHeight(height int32) error {
buf := make([]byte, binary.MaxVarintLen64)
binary.PutVarint(buf, int64(height))
return o.ldb.Put([]byte(heightKey), buf, nil)
}
func (o *db) Get(key []byte) (*wire.TxOut, error) {
serialized, err := o.ldb.Get(key, nil)
if err == leveldb.ErrNotFound {
return nil, nil
}
if err != nil {
return nil, err
}
pkScript := make([]byte, len(serialized)-binary.MaxVarintLen64)
value := int64(binary.LittleEndian.Uint64(serialized[:binary.MaxVarintLen64]))
copy(pkScript, serialized[binary.MaxVarintLen64:])
return wire.NewTxOut(value, pkScript), nil
}
func (o *db) Put(key []byte, tx *wire.TxOut) error {
value := make([]byte, len(tx.PkScript)+binary.MaxVarintLen64)
binary.LittleEndian.PutUint64(value[:binary.MaxVarintLen64], uint64(tx.Value))
copy(value[binary.MaxVarintLen64:], tx.PkScript[:])
return o.ldb.Put(key, value[:], nil)
}
func (o *db) PutBatch(entries []KeyTx) error {
batch := &leveldb.Batch{}
for _, e := range entries {
value := make([]byte, len(e.Tx.PkScript)+binary.MaxVarintLen64)
binary.LittleEndian.PutUint64(value[:binary.MaxVarintLen64], uint64(e.Tx.Value))
copy(value[binary.MaxVarintLen64:], e.Tx.PkScript[:])
batch.Put(e.Key, value)
}
return o.ldb.Write(batch, nil)
}
func (o *db) Close() error {
return o.ldb.Close()
}
func NewDB(path string) (*db, error) {
opts := opt.Options{
Strict: opt.DefaultStrict,
Compression: opt.NoCompression,
}
odb, err := leveldb.OpenFile(path, &opts)
if err != nil {
return nil, err
}
return &db{ldb: odb}, nil
}