/
db_leveldb.go
201 lines (161 loc) · 4.18 KB
/
db_leveldb.go
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package abci
import (
"encoding/binary"
"encoding/json"
"github.com/blockcypher/libgrin/core"
"github.com/olegabu/go-mimblewimble/pkg/ledger"
"github.com/pkg/errors"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/util"
"log"
"path/filepath"
"strings"
)
var dbFilename string
type leveldbDatabase struct {
db *leveldb.DB
currentBatch *leveldb.Batch
}
func NewLeveldbDatabase(dbDir string) (d ledger.Database, err error) {
dbFilename = filepath.Join(dbDir, "abci")
ldb, err := leveldb.OpenFile(dbFilename, nil)
if err != nil {
err = errors.Wrapf(err, "cannot open leveldb at %v", dbFilename)
return
}
log.Printf("opened abci db at %v\n", dbFilename)
d = &leveldbDatabase{db: ldb}
return
}
func (t *leveldbDatabase) Close() {
err := t.db.Close()
if err != nil {
log.Fatal("cannot close leveldb:", err)
}
}
func (t *leveldbDatabase) InputExists(input core.Input) error {
_, err := t.db.Get(outputKey(input.Commit), nil)
if err != nil {
return errors.Wrapf(err, "cannot get input %v", input)
}
return nil
}
func (t *leveldbDatabase) SpendInput(input core.Input) error {
t.currentBatch.Delete(outputKey(input.Commit))
return nil
}
func (t *leveldbDatabase) PutOutput(o core.Output) error {
bytes, _ := json.Marshal(o)
t.currentBatch.Put(outputKey(o.Commit), bytes)
return nil
}
func (t *leveldbDatabase) PutKernel(o core.TxKernel) error {
bytes, _ := json.Marshal(o)
t.currentBatch.Put(kernelKey(o.Excess), bytes)
return nil
}
func (t *leveldbDatabase) Begin() {
t.currentBatch = new(leveldb.Batch)
}
func (t *leveldbDatabase) Commit() (err error) {
err = t.db.Write(t.currentBatch, nil)
if err != nil {
err = errors.Wrapf(err, "cannot db.Write")
}
return
}
func (t *leveldbDatabase) GetOutput(id []byte) (output core.Output, err error) {
output = core.Output{}
outputBytes, err := t.db.Get(outputKey(string(id)), nil)
if err != nil {
err = errors.Wrapf(err, "cannot db.Get")
return
}
err = json.Unmarshal(outputBytes, &output)
return
}
func (t *leveldbDatabase) ListOutputs() (list []core.Output, err error) {
list = make([]core.Output, 0)
iter := t.db.NewIterator(outputRange(), nil)
for iter.Next() {
o := core.Output{}
err = json.Unmarshal(iter.Value(), &o)
list = append(list, o)
}
iter.Release()
err = iter.Error()
return
}
func (t *leveldbDatabase) ListKernels() (list []core.TxKernel, err error) {
list = make([]core.TxKernel, 0)
iter := t.db.NewIterator(kernelRange(), nil)
for iter.Next() {
o := core.TxKernel{}
err = json.Unmarshal(iter.Value(), &o)
list = append(list, o)
}
iter.Release()
err = iter.Error()
return
}
func (t *leveldbDatabase) AddAsset(asset string, value uint64) {
var total uint64
totalBytes := make([]byte, 8)
currentTotalBytes, err := t.db.Get(assetKey(asset), nil)
if err != nil {
total = value
} else {
currentTotal, _ := binary.Uvarint(currentTotalBytes)
total = currentTotal + value
}
binary.PutUvarint(totalBytes, total)
t.currentBatch.Put(assetKey(asset), totalBytes)
}
func (t *leveldbDatabase) ListAssets() (list map[string]uint64, err error) {
list = make(map[string]uint64)
iter := t.db.NewIterator(assetRange(), nil)
for iter.Next() {
currentTotal, _ := binary.Uvarint(iter.Value())
list[assetFromKey(iter.Key())] = currentTotal
}
iter.Release()
err = iter.Error()
return
}
func (t *leveldbDatabase) ResetAssets() error {
iter := t.db.NewIterator(assetRange(), nil)
for iter.Next() {
err := t.db.Delete(iter.Key(), nil)
if err != nil {
return errors.Wrap(err, "cannot delete asset")
}
}
iter.Release()
err := iter.Error()
if err != nil {
return errors.Wrap(err, "cannot iterate over assets")
}
return nil
}
func outputKey(o string) []byte {
return []byte("output." + o)
}
func outputRange() *util.Range {
return util.BytesPrefix([]byte("output."))
}
func kernelKey(o string) []byte {
return []byte("kernel." + o)
}
func kernelRange() *util.Range {
return util.BytesPrefix([]byte("kernel."))
}
func assetKey(o string) []byte {
return []byte("asset." + o)
}
func assetFromKey(key []byte) string {
s := string(key)
return strings.Split(s, "asset.")[1]
}
func assetRange() *util.Range {
return util.BytesPrefix([]byte("asset."))
}