--- /dev/null
+package synchron
+
+import (
+ "database/sql"
+ "encoding/hex"
+ "fmt"
+ "time"
+
+ "github.com/jinzhu/gorm"
+ log "github.com/sirupsen/logrus"
+
+ "github.com/vapor/consensus"
+ "github.com/vapor/errors"
+ "github.com/vapor/federation/common"
+ "github.com/vapor/federation/config"
+ "github.com/vapor/federation/database"
+ "github.com/vapor/federation/database/orm"
+ "github.com/vapor/federation/service"
+ "github.com/vapor/protocol/bc"
+ "github.com/vapor/protocol/bc/types"
+)
+
+type sidechainKeeper struct {
+ cfg *config.Chain
+ db *gorm.DB
+ node *service.Node
+ chainName string
+ assetCache *database.AssetCache
+}
+
+func NewSidechainKeeper(db *gorm.DB, chainCfg *config.Chain) *sidechainKeeper {
+ return &sidechainKeeper{
+ cfg: chainCfg,
+ db: db,
+ node: service.NewNode(chainCfg.Upstream),
+ chainName: chainCfg.Name,
+ assetCache: database.NewAssetCache(),
+ }
+}
+
+func (s *sidechainKeeper) Run() {
+ ticker := time.NewTicker(time.Duration(s.cfg.SyncSeconds) * time.Second)
+ for ; true; <-ticker.C {
+ for {
+ isUpdate, err := s.syncBlock()
+ if err != nil {
+ log.WithField("error", err).Errorln("blockKeeper fail on process block")
+ break
+ }
+
+ if !isUpdate {
+ break
+ }
+ }
+ }
+}
+
+func (s *sidechainKeeper) syncBlock() (bool, error) {
+ chain := &orm.Chain{Name: s.chainName}
+ if err := s.db.Where(chain).First(chain).Error; err != nil {
+ return false, errors.Wrap(err, "query chain")
+ }
+
+ height, err := s.node.GetBlockCount()
+ if err != nil {
+ return false, err
+ }
+
+ if height <= chain.BlockHeight+s.cfg.Confirmations {
+ return false, nil
+ }
+
+ nextBlockStr, txStatus, err := s.node.GetBlockByHeight(chain.BlockHeight + 1)
+ if err != nil {
+ return false, err
+ }
+
+ nextBlock := &types.Block{}
+ if err := nextBlock.UnmarshalText([]byte(nextBlockStr)); err != nil {
+ return false, errors.New("Unmarshal nextBlock")
+ }
+
+ if nextBlock.PreviousBlockHash.String() != chain.BlockHash {
+ log.WithFields(log.Fields{
+ "remote PreviousBlockHash": nextBlock.PreviousBlockHash.String(),
+ "db block_hash": chain.BlockHash,
+ }).Fatal("BlockHash mismatch")
+ return false, ErrInconsistentDB
+ }
+
+ if err := s.tryAttachBlock(chain, nextBlock, txStatus); err != nil {
+ return false, err
+ }
+
+ return true, nil
+}
+
+func (s *sidechainKeeper) tryAttachBlock(chain *orm.Chain, block *types.Block, txStatus *bc.TransactionStatus) error {
+ blockHash := block.Hash()
+ log.WithFields(log.Fields{"block_height": block.Height, "block_hash": blockHash.String()}).Info("start to attachBlock")
+ s.db.Begin()
+ if err := s.processBlock(chain, block, txStatus); err != nil {
+ s.db.Rollback()
+ return err
+ }
+
+ return s.db.Commit().Error
+}
+
+func (s *sidechainKeeper) processBlock(chain *orm.Chain, block *types.Block, txStatus *bc.TransactionStatus) error {
+ for i, tx := range block.Transactions {
+ if s.isDepositTx(tx) {
+ if err := s.processDepositTx(chain, block, uint64(i), tx); err != nil {
+ return err
+ }
+ }
+
+ if s.isWithdrawalTx(tx) {
+ if err := s.processWithdrawalTx(chain, block, txStatus, uint64(i), tx); err != nil {
+ return err
+ }
+ }
+ }
+
+ return s.processChainInfo(chain, block)
+}
+
+func (s *sidechainKeeper) isDepositTx(tx *types.Tx) bool {
+ for _, input := range tx.Inputs {
+ if input.InputType() == types.CrossChainInputType {
+ return true
+ }
+ }
+ return false
+}
+
+func (s *sidechainKeeper) isWithdrawalTx(tx *types.Tx) bool {
+ for _, output := range tx.Outputs {
+ if output.OutputType() == types.CrossChainOutputType {
+ return true
+ }
+ }
+ return false
+}
+
+func (s *sidechainKeeper) processDepositTx(chain *orm.Chain, block *types.Block, txIndex uint64, tx *types.Tx) error {
+ blockHash := block.Hash()
+ stmt := s.db.Model(&orm.CrossTransaction{}).Where("chain_id != ?", chain.ID).
+ Where(&orm.CrossTransaction{
+ DestTxHash: sql.NullString{tx.ID.String(), true},
+ Status: common.CrossTxSubmittedStatus,
+ }).UpdateColumn(&orm.CrossTransaction{
+ DestBlockHeight: sql.NullInt64{int64(block.Height), true},
+ DestBlockHash: sql.NullString{blockHash.String(), true},
+ DestTxIndex: sql.NullInt64{int64(txIndex), true},
+ Status: common.CrossTxCompletedStatus,
+ })
+ if stmt.Error != nil {
+ return stmt.Error
+ }
+
+ if stmt.RowsAffected != 1 {
+ log.Warnf("sidechainKeeper.processDepositTx(%v): rows affected != 1", tx.ID.String())
+ }
+ return nil
+}
+
+func (s *sidechainKeeper) processWithdrawalTx(chain *orm.Chain, block *types.Block, txStatus *bc.TransactionStatus, txIndex uint64, tx *types.Tx) error {
+ blockHash := block.Hash()
+
+ var muxID bc.Hash
+ res0ID := tx.ResultIds[0]
+ switch res := tx.Entries[*res0ID].(type) {
+ case *bc.CrossChainOutput:
+ muxID = *res.Source.Ref
+ case *bc.IntraChainOutput:
+ muxID = *res.Source.Ref
+ case *bc.VoteOutput:
+ muxID = *res.Source.Ref
+ default:
+ return ErrOutputType
+ }
+
+ rawTx, err := tx.MarshalText()
+ if err != nil {
+ return err
+ }
+
+ ormTx := &orm.CrossTransaction{
+ ChainID: chain.ID,
+ SourceBlockHeight: block.Height,
+ SourceBlockHash: blockHash.String(),
+ SourceTxIndex: txIndex,
+ SourceMuxID: muxID.String(),
+ SourceTxHash: tx.ID.String(),
+ SourceRawTransaction: string(rawTx),
+ DestBlockHeight: sql.NullInt64{Valid: false},
+ DestBlockHash: sql.NullString{Valid: false},
+ DestTxIndex: sql.NullInt64{Valid: false},
+ DestTxHash: sql.NullString{Valid: false},
+ Status: common.CrossTxPendingStatus,
+ }
+ if err := s.db.Create(ormTx).Error; err != nil {
+ return errors.Wrap(err, fmt.Sprintf("create sidechain WithdrawalTx %s", tx.ID.String()))
+ }
+
+ statusFail := txStatus.VerifyStatus[txIndex].StatusFail
+ crossChainOutputs, err := s.getCrossChainReqs(ormTx.ID, tx, statusFail)
+ if err != nil {
+ return err
+ }
+
+ for _, output := range crossChainOutputs {
+ if err := s.db.Create(output).Error; err != nil {
+ return errors.Wrap(err, fmt.Sprintf("create WithdrawalFromSidechain output: txid(%s), pos(%d)", tx.ID.String(), output.SourcePos))
+ }
+ }
+
+ return nil
+}
+
+func (s *sidechainKeeper) getCrossChainReqs(crossTransactionID uint64, tx *types.Tx, statusFail bool) ([]*orm.CrossTransactionReq, error) {
+ // assume inputs are from an identical owner
+ script := hex.EncodeToString(tx.Inputs[0].ControlProgram())
+ inputs := []*orm.CrossTransactionReq{}
+ for i, rawOutput := range tx.Outputs {
+ // check valid withdrawal
+ if rawOutput.OutputType() != types.CrossChainOutputType {
+ continue
+ }
+
+ if statusFail && *rawOutput.OutputCommitment().AssetAmount.AssetId != *consensus.BTMAssetID {
+ continue
+ }
+
+ asset, err := s.getAsset(rawOutput.OutputCommitment().AssetAmount.AssetId.String())
+ if err != nil {
+ return nil, err
+ }
+
+ input := &orm.CrossTransactionReq{
+ CrossTransactionID: crossTransactionID,
+ SourcePos: uint64(i),
+ AssetID: asset.ID,
+ AssetAmount: rawOutput.OutputCommitment().AssetAmount.Amount,
+ Script: script,
+ }
+ inputs = append(inputs, input)
+ }
+ return inputs, nil
+}
+
+func (s *sidechainKeeper) processChainInfo(chain *orm.Chain, block *types.Block) error {
+ blockHash := block.Hash()
+ chain.BlockHash = blockHash.String()
+ chain.BlockHeight = block.Height
+ res := s.db.Model(chain).Where("block_hash = ?", block.PreviousBlockHash.String()).Updates(chain)
+ if err := res.Error; err != nil {
+ return err
+ }
+
+ if res.RowsAffected != 1 {
+ return ErrInconsistentDB
+ }
+
+ return nil
+}
+
+func (s *sidechainKeeper) getAsset(assetID string) (*orm.Asset, error) {
+ if asset := s.assetCache.Get(assetID); asset != nil {
+ return asset, nil
+ }
+
+ asset := &orm.Asset{AssetID: assetID}
+ if err := s.db.Where(asset).First(asset).Error; err != nil {
+ return nil, errors.Wrap(err, "asset not found in memory and mysql")
+ }
+
+ s.assetCache.Add(assetID, asset)
+ return asset, nil
+}
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