func (a *Anchor) checkTxMalleation(transaction *btcutil.Tx, details *btcjson.BlockDetails) {
anchorLog.Debug("in checkTxMalleation")
dirBlockInfos := make([]interfaces.IDirBlockInfo, 0, len(a.dirBlockInfoSlice))
for _, v := range a.dirBlockInfoSlice {
// find those already anchored but no call back yet
if v.GetBTCBlockHeight() == 0 && bytes.Compare(v.GetBTCTxHash().Bytes(), primitives.NewZeroHash().Bytes()) != 0 {
dirBlockInfos = append(dirBlockInfos, v)
}
}
sort.Sort(util.ByDirBlockInfoTimestamp(dirBlockInfos))
anchorLog.Debugf("malleated tx candidate count=%d, dirBlockInfo list=%s\n", len(dirBlockInfos), spew.Sdump(dirBlockInfos))
for _, dirBlockInfo := range dirBlockInfos {
tx, err := a.wclient.GetRawTransaction(toShaHash(dirBlockInfo.GetBTCTxHash()))
if err != nil {
anchorLog.Debugf(err.Error())
continue
}
anchorLog.Debugf("GetRawTransaction=%s, dirBlockInfo=%s\n", spew.Sdump(tx), spew.Sdump(dirBlockInfo))
// compare OP_RETURN
if reflect.DeepEqual(transaction.MsgTx().TxOut[0], tx.MsgTx().TxOut[0]) {
anchorLog.Debugf("Tx Malleated: original.txid=%s, malleated.txid=%s\n", dirBlockInfo.GetBTCTxHash().(*primitives.Hash).BTCString(), transaction.Sha().String())
a.doSaveDirBlockInfo(transaction, details, dirBlockInfo.(*dbInfo.DirBlockInfo), true)
break
}
}
}
func (a *Anchor) doSaveDirBlockInfo(transaction *btcutil.Tx, details *btcjson.BlockDetails, dirBlockInfo *dbInfo.DirBlockInfo, replace bool) {
if replace {
dirBlockInfo.BTCTxHash = toHash(transaction.Sha()) // in case of tx being malleated
}
dirBlockInfo.BTCTxOffset = int32(details.Index)
dirBlockInfo.BTCBlockHeight = details.Height
btcBlockHash, _ := wire.NewShaHashFromStr(details.Hash)
dirBlockInfo.BTCBlockHash = toHash(btcBlockHash)
dirBlockInfo.SetTimestamp(primitives.NewTimestampNow())
a.db.SaveDirBlockInfo(dirBlockInfo)
anchorLog.Infof("In doSaveDirBlockInfo, dirBlockInfo:%s saved to db\n", spew.Sdump(dirBlockInfo))
// to make factom / explorer more user friendly, instead of waiting for
// over 2 hours to know it's anchored, we can create the anchor chain instantly
// then change it when the btc main chain re-org happens.
a.saveToAnchorChain(dirBlockInfo)
}
func saveDirBlockInfo(transaction *btcutil.Tx, details *btcjson.BlockDetails) {
anchorLog.Debug("in saveDirBlockInfo")
var saved = false
for _, dirBlockInfo := range dirBlockInfoMap {
if dirBlockInfo.BTCTxHash != nil &&
bytes.Compare(dirBlockInfo.BTCTxHash.Bytes(), transaction.Sha().Bytes()) == 0 {
dirBlockInfo.BTCTxOffset = int32(details.Index)
dirBlockInfo.BTCBlockHeight = details.Height
btcBlockHash, _ := wire.NewShaHashFromStr(details.Hash)
dirBlockInfo.BTCBlockHash = toHash(btcBlockHash)
dirBlockInfo.BTCConfirmed = true
db.InsertDirBlockInfo(dirBlockInfo)
delete(dirBlockInfoMap, dirBlockInfo.DBMerkleRoot.String())
anchorLog.Infof("In saveDirBlockInfo, dirBlockInfo:%s saved to db\n", spew.Sdump(dirBlockInfo))
saved = true
anchorRec := new(AnchorRecord)
anchorRec.AnchorRecordVer = 1
anchorRec.DBHeight = dirBlockInfo.DBHeight
anchorRec.KeyMR = dirBlockInfo.DBMerkleRoot.String()
_, recordHeight, _ := db.FetchBlockHeightCache()
anchorRec.RecordHeight = uint32(recordHeight)
anchorRec.Bitcoin.Address = defaultAddress.String()
anchorRec.Bitcoin.TXID = transaction.Sha().String()
anchorRec.Bitcoin.BlockHeight = details.Height
anchorRec.Bitcoin.BlockHash = details.Hash
anchorRec.Bitcoin.Offset = int32(details.Index)
anchorLog.Info("anchor.record saved: " + spew.Sdump(anchorRec))
//jsonARecord, _ := json.Marshal(anchorRec)
//anchorLog.Debug("jsonAnchorRecord: ", string(jsonARecord))
//Submit the anchor record to the anchor chain (entry chain)
err := submitEntryToAnchorChain(anchorRec)
if err != nil {
anchorLog.Error("Error in writing anchor into anchor chain: ", err.Error())
}
break
}
}
// should not happen at all?
if !saved {
anchorLog.Info("Not saved to db: ")
}
}
func saveDirBlockInfo(transaction *btcutil.Tx, details *btcjson.BlockDetails) {
anchorLog.Debug("in saveDirBlockInfo")
var saved = false
for _, dirBlockInfo := range dirBlockInfoMap {
if bytes.Compare(dirBlockInfo.BTCTxHash.Bytes(), transaction.Sha().Bytes()) == 0 {
dirBlockInfo.BTCTxOffset = int32(details.Index)
dirBlockInfo.BTCBlockHeight = details.Height
btcBlockHash, _ := wire.NewShaHashFromStr(details.Hash)
dirBlockInfo.BTCBlockHash = toHash(btcBlockHash)
dirBlockInfo.BTCConfirmed = true
db.InsertDirBlockInfo(dirBlockInfo)
delete(dirBlockInfoMap, dirBlockInfo.DBMerkleRoot.String())
anchorLog.Infof("In saveDirBlockInfo, dirBlockInfo:%s saved to db\n", spew.Sdump(dirBlockInfo))
saved = true
anchorRec := new(AnchorRecord)
anchorRec.AnchorRecordVer = 1
anchorRec.DBHeight = dirBlockInfo.DBHeight
anchorRec.KeyMR = dirBlockInfo.DBMerkleRoot.String()
_, recordHeight, _ := db.FetchBlockHeightCache()
anchorRec.RecordHeight = uint32(recordHeight)
anchorRec.Bitcoin.Address = defaultAddress.String()
anchorRec.Bitcoin.TXID = transaction.Sha().String()
anchorRec.Bitcoin.BlockHeight = details.Height
anchorRec.Bitcoin.BlockHash = details.Hash
anchorRec.Bitcoin.Offset = int32(details.Index)
anchorLog.Info("anchor.record saved: " + spew.Sdump(anchorRec))
err := submitEntryToAnchorChain(anchorRec)
if err != nil {
anchorLog.Error("Error in writing anchor into anchor chain: ", err.Error())
}
break
}
}
// This happends when there's a double spending (for dir block 122 and its btc tx)
// (see https://www.blocktrail.com/BTC/tx/ac82f4173259494b22f4987f1e18608f38f1ff756fb4a3c637dfb5565aa5e6cf)
// or tx mutation / malleated
// In this case, it will end up being re-anchored.
if !saved {
anchorLog.Info("Not saved to db: btc.tx=%s\n blockDetails=%s\n", spew.Sdump(transaction), spew.Sdump(details))
}
}
func (a *Anchor) saveDirBlockInfo(transaction *btcutil.Tx, details *btcjson.BlockDetails) {
anchorLog.Debug("in saveDirBlockInfo")
var saved = false
for _, dirBlockInfo := range a.dirBlockInfoSlice {
if bytes.Compare(dirBlockInfo.GetBTCTxHash().Bytes(), transaction.Sha().Bytes()) == 0 {
a.doSaveDirBlockInfo(transaction, details, dirBlockInfo.(*dbInfo.DirBlockInfo), false)
saved = true
break
}
}
// This happends when there's a double spending or tx malleated(for dir block 122 and its btc tx)
// Original: https://www.blocktrail.com/BTC/tx/ac82f4173259494b22f4987f1e18608f38f1ff756fb4a3c637dfb5565aa5e6cf
// malleated: https://www.blocktrail.com/BTC/tx/a9b2d6b5d320c7f0f384a49b167524aca9c412af36ed7b15ca7ea392bccb2538
// re-anchored: https://www.blocktrail.com/BTC/tx/ac82f4173259494b22f4987f1e18608f38f1ff756fb4a3c637dfb5565aa5e6cf
// In this case, if tx malleation is detected, then use the malleated tx to replace the original tx;
// Otherwise, it will end up being re-anchored.
if !saved {
anchorLog.Infof("Not saved to db, (maybe btc tx malleated): btc.tx=%s\n blockDetails=%s\n", spew.Sdump(transaction), spew.Sdump(details))
a.checkTxMalleation(transaction, details)
}
}
func saveDirBlockInfo(transaction *btcutil.Tx, details *btcjson.BlockDetails) {
anchorLog.Debug("to save dir block hash to btc.")
var saved = false
for _, dirBlockInfo := range dirBlockInfoMap {
if dirBlockInfo.BTCTxHash != nil &&
bytes.Compare(dirBlockInfo.BTCTxHash.Bytes(), transaction.Sha().Bytes()) == 0 {
dirBlockInfo.BTCTxOffset = int32(details.Index)
dirBlockInfo.BTCBlockHeight = details.Height
dirBlockInfo.BTCConfirmed = true
db.InsertDirBlockInfo(dirBlockInfo)
delete(dirBlockInfoMap, dirBlockInfo.DBMerkleRoot.String())
anchorLog.Info("In saveDirBlockInfo, dirBlockInfo:%+v saved to db\n", dirBlockInfo)
saved = true
break
}
}
// should not happen at all?
if !saved {
anchorLog.Info("Not saved to db: ")
}
}