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badger_utxo.go
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badger_utxo.go
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package storage
import (
"fmt"
"github.com/MixinNetwork/mixin/common"
"github.com/MixinNetwork/mixin/crypto"
"github.com/dgraph-io/badger"
)
func (s *BadgerStore) ReadUTXO(hash crypto.Hash, index int) (*common.UTXOWithLock, error) {
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
key := graphUtxoKey(hash, index)
item, err := txn.Get(key)
if err == badger.ErrKeyNotFound {
return nil, nil
}
if err != nil {
return nil, err
}
ival, err := item.ValueCopy(nil)
if err != nil {
return nil, err
}
var out common.UTXOWithLock
err = common.DecompressMsgpackUnmarshal(ival, &out)
return &out, err
}
func (s *BadgerStore) LockUTXO(hash crypto.Hash, index int, tx crypto.Hash, fork bool) error {
return s.snapshotsDB.Update(func(txn *badger.Txn) error {
key := graphUtxoKey(hash, index)
item, err := txn.Get(key)
if err != nil {
return err
}
ival, err := item.ValueCopy(nil)
if err != nil {
return err
}
var out common.UTXOWithLock
err = common.DecompressMsgpackUnmarshal(ival, &out)
if err != nil {
return err
}
if out.LockHash.HasValue() && out.LockHash != tx {
if !fork {
return fmt.Errorf("utxo locked for transaction %s", out.LockHash)
}
err := pruneTransaction(txn, out.LockHash)
if err != nil {
return err
}
}
out.LockHash = tx
return txn.Set(key, common.CompressMsgpackMarshalPanic(out))
})
}
func (s *BadgerStore) CheckGhost(key crypto.Key) (bool, error) {
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
_, err := txn.Get(graphGhostKey(key))
if err == badger.ErrKeyNotFound {
return false, nil
}
if err != nil {
return false, err
}
return true, nil
}