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badger_utxo.go
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badger_utxo.go
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package storage
import (
"fmt"
"slices"
"github.com/MixinNetwork/mixin/common"
"github.com/MixinNetwork/mixin/crypto"
"github.com/dgraph-io/badger/v4"
)
func (s *BadgerStore) ReadUTXOKeys(hash crypto.Hash, index uint) (*common.UTXOKeys, error) {
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
utxo, err := s.readUTXOLock(txn, hash, index)
if err != nil {
return nil, err
}
return &common.UTXOKeys{
Mask: utxo.Mask,
Keys: utxo.Keys,
}, nil
}
func (s *BadgerStore) ReadUTXOLock(hash crypto.Hash, index uint) (*common.UTXOWithLock, error) {
s.mutex.RLock()
defer s.mutex.RUnlock()
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
return s.readUTXOLock(txn, hash, index)
}
func (s *BadgerStore) readUTXOLock(txn *badger.Txn, hash crypto.Hash, index uint) (*common.UTXOWithLock, error) {
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
}
return common.UnmarshalUTXO(ival)
}
func (s *BadgerStore) LockUTXOs(inputs []*common.Input, tx crypto.Hash, fork bool) error {
s.mutex.Lock()
defer s.mutex.Unlock()
return s.snapshotsDB.Update(func(txn *badger.Txn) error {
for _, in := range inputs {
err := lockUTXO(txn, in.Hash, in.Index, tx, fork)
if err != nil {
return err
}
}
return nil
})
}
func lockUTXO(txn *badger.Txn, hash crypto.Hash, index uint, tx crypto.Hash, fork bool) 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
}
out, err := common.UnmarshalUTXO(ival)
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, out.Marshal())
}
func (s *BadgerStore) ReadGhostKeyLock(key crypto.Key) (*crypto.Hash, error) {
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
item, err := txn.Get(graphGhostKey(key))
if err == badger.ErrKeyNotFound {
return nil, nil
}
if err != nil {
return nil, err
}
var by crypto.Hash
_, err = item.ValueCopy(by[:])
return &by, err
}
func (s *BadgerStore) LockGhostKeys(keys []*crypto.Key, tx crypto.Hash, fork bool) error {
s.mutex.RLock()
defer s.mutex.RUnlock()
return s.snapshotsDB.Update(func(txn *badger.Txn) error {
filter := make(map[crypto.Key]bool)
for _, ghost := range keys {
if filter[*ghost] {
return fmt.Errorf("duplicated ghost key %s", ghost.String())
}
filter[*ghost] = true
err := lockGhostKey(txn, ghost, tx, fork)
if err != nil {
return err
}
}
return nil
})
}
func lockGhostKey(txn *badger.Txn, ghost *crypto.Key, tx crypto.Hash, fork bool) error {
key := graphGhostKey(*ghost)
item, err := txn.Get(key)
if err == badger.ErrKeyNotFound {
return txn.Set(key, tx[:])
}
if err != nil {
return err
}
var by crypto.Hash
val, err := item.ValueCopy(by[:])
if err != nil {
return err
}
if len(val) != len(by) || !by.HasValue() {
return fmt.Errorf("ghost key %s malformed lock %x", ghost.String(), val)
}
if fork && slices.Contains([]string{
"c63b6373652def5999c1d951fcb8f064db67b7d18565847b921b21639e15dddd",
"60deaf2471bb0b6481efe9080d8852b020ab2941e7faae21989d2404f34284ee",
"a558b1efbe27eb6a6f902fd97d4b7e2e3099e6edde1fe6e8e41204e0685fe426",
}, tx.String()) {
return nil
}
if by != tx {
return fmt.Errorf("ghost key %s locked for transaction %s", ghost.String(), by.String())
}
return nil
}