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db.go
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db.go
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package db
import (
"encoding/binary"
"errors"
"fmt"
"github.com/ci123chain/ci123chain/pkg/abci/types"
)
const (
VersionSize = 8
)
var (
ErrKeyNotFound = errors.New("types not found")
)
var _ StateDB = new(VersionedDB)
type StateDB interface {
Set(k, v []byte) error
Get(k []byte) ([]byte, error)
}
type Version struct {
Height uint32
TxIdx uint32
}
func (v Version) Bytes() []byte {
b := make([]byte, VersionSize)
binary.BigEndian.PutUint32(b, v.Height)
binary.BigEndian.PutUint32(b[4:], v.TxIdx)
return b
}
func MakeVersion(b []byte) (Version, error) {
if l := len(b); l != VersionSize {
return Version{}, fmt.Errorf("invalid size: %v", l)
}
v := Version{}
v.Height = binary.BigEndian.Uint32(b)
v.TxIdx = binary.BigEndian.Uint32(b[4:])
return v, nil
}
type VersionedDB struct {
store types.KVStore
rwm *RWSetMap
}
func NewVersionedDB(store types.KVStore) *VersionedDB {
return &VersionedDB{
store: store,
rwm: NewRWSetMap(),
}
}
func (db *VersionedDB) get(k []byte) (*ValueObject, error) {
b := db.store.Get(k)
if b == nil {
return nil, ErrKeyNotFound
}
return BytesToValueObject(b)
}
func (db *VersionedDB) Set(k, v []byte) error {
db.rwm.AddWrite(k, v)
return nil
}
func (db *VersionedDB) set(k, v []byte, version Version) {
db.store.Set(k, (&ValueObject{Value: v, Version: version}).Marshal())
}
func (db *VersionedDB) Get(k []byte) ([]byte, error) {
vo, err := db.get(k)
if err != nil {
return nil, err
}
if _, ok := db.rwm.GetRead(k); !ok {
db.rwm.AddRead(k, vo.Version)
}
return vo.Value, nil
}
func (db *VersionedDB) RWSetItems() *RWSetItems {
return db.rwm.ToItems()
}