--- /dev/null
+package mov
+
+import (
+ "github.com/vapor/application/mov/common"
+ "github.com/vapor/application/mov/contract"
+ "github.com/vapor/application/mov/database"
+ "github.com/vapor/application/mov/match"
+ "github.com/vapor/consensus/segwit"
+ "github.com/vapor/errors"
+ "github.com/vapor/math/checked"
+ "github.com/vapor/protocol/bc"
+ "github.com/vapor/protocol/bc/types"
+)
+
+const maxFeeRate = 0.05
+
+var (
+ errInvalidTradePairs = errors.New("The trade pairs in the tx input is invalid")
+)
+
+type MovCore struct {
+ movStore database.MovStore
+}
+
+func NewMovCore(store database.MovStore) *MovCore {
+ return &MovCore{movStore: store}
+}
+
+// ChainStatus return the current block height and block hash in dex core
+func (m *MovCore) ChainStatus() (uint64, *bc.Hash, error) {
+ state, err := m.movStore.GetMovDatabaseState()
+ if err != nil {
+ return 0, nil, err
+ }
+
+ return state.Height, state.Hash, nil
+}
+
+func (m *MovCore) ValidateBlock(block *types.Block, verifyResults []*bc.TxVerifyResult) error {
+ return m.ValidateTxs(block.Transactions, verifyResults)
+}
+
+// ValidateTxs validate the trade transaction.
+func (m *MovCore) ValidateTxs(txs []*types.Tx, verifyResults []*bc.TxVerifyResult) error {
+ for _, tx := range txs {
+ if common.IsMatchedTx(tx) {
+ if err := validateMatchedTx(tx); err != nil {
+ return err
+ }
+ }
+
+ if common.IsCancelOrderTx(tx) {
+ if err := validateCancelOrderTx(tx); err != nil {
+ return err
+ }
+ }
+
+ for _, output := range tx.Outputs {
+ if !segwit.IsP2WMCScript(output.ControlProgram()) {
+ continue
+ }
+
+ if err := validateMagneticContractArgs(output.AssetAmount().Amount, output.ControlProgram()); err != nil {
+ return err
+ }
+ }
+ }
+ return nil
+}
+
+func validateMatchedTx(tx *types.Tx) error {
+ fromAssetIDMap := make(map[string]bool)
+ toAssetIDMap := make(map[string]bool)
+ for i, input := range tx.Inputs {
+ if !segwit.IsP2WMCScript(input.ControlProgram()) {
+ return errors.New("input program of matched tx must p2wmc script")
+ }
+
+ if contract.IsCancelClauseSelector(input) {
+ return errors.New("can't exist cancel order in the matched transaction")
+ }
+
+ order, err := common.NewOrderFromInput(tx, i)
+ if err != nil {
+ return err
+ }
+
+ fromAssetIDMap[order.FromAssetID.String()] = true
+ toAssetIDMap[order.ToAssetID.String()] = true
+ }
+
+ if len(fromAssetIDMap) != len(tx.Inputs) || len(toAssetIDMap) != len(tx.Inputs) {
+ return errors.New("asset id must unique in matched transaction")
+ }
+
+ return validateMatchedTxFeeAmount(tx)
+}
+
+func validateCancelOrderTx(tx *types.Tx) error {
+ for _, input := range tx.Inputs {
+ if !segwit.IsP2WMCScript(input.ControlProgram()) {
+ return errors.New("input program of cancel order tx must p2wmc script")
+ }
+
+ if contract.IsTradeClauseSelector(input) {
+ return errors.New("can't exist trade order in the cancel order transaction")
+ }
+ }
+ return nil
+}
+
+func validateMatchedTxFeeAmount(tx *types.Tx) error {
+ txFee, err := match.CalcMatchedTxFee(&tx.TxData, maxFeeRate)
+ if err != nil {
+ return err
+ }
+
+ for _, amount := range txFee {
+ if amount.FeeAmount > amount.MaxFeeAmount {
+ return errors.New("amount of fee greater than max fee amount")
+ }
+ }
+ return nil
+}
+
+func validateMagneticContractArgs(inputAmount uint64, program []byte) error {
+ contractArgs, err := segwit.DecodeP2WMCProgram(program)
+ if err != nil {
+ return err
+ }
+
+ if contractArgs.RatioNumerator <= 0 || contractArgs.RatioDenominator <= 0 {
+ return errors.New("ratio arguments must greater than zero")
+ }
+
+ if _, ok := checked.MulInt64(int64(inputAmount), contractArgs.RatioNumerator); !ok {
+ return errors.New("ratio numerator of contract args product input amount is overflow")
+ }
+ return nil
+}
+
+// ApplyBlock parse pending order and cancel from the the transactions of block
+// and add pending order to the dex db, remove cancel order from dex db.
+func (m *MovCore) ApplyBlock(block *types.Block) error {
+ if err := m.validateMatchedTxSequence(block.Transactions); err != nil {
+ return err
+ }
+
+ addOrders, deleteOrders, err := applyTransactions(block.Transactions)
+ if err != nil {
+ return err
+ }
+
+ return m.movStore.ProcessOrders(addOrders, deleteOrders, &block.BlockHeader)
+}
+
+func (m *MovCore) validateMatchedTxSequence(txs []*types.Tx, ) error {
+ matchEngine := match.NewEngine(m.movStore, maxFeeRate, nil)
+ for _, matchedTx := range txs {
+ if !common.IsMatchedTx(matchedTx) {
+ continue
+ }
+
+ tradePairs, err := getSortedTradePairsFromMatchedTx(matchedTx)
+ if err != nil {
+ return err
+ }
+
+ actualMatchedTx, err := matchEngine.NextMatchedTx(tradePairs...)
+ if err != nil {
+ return err
+ }
+
+ if len(matchedTx.Inputs) != len(actualMatchedTx.Inputs) {
+ return errors.New("length of matched tx input is not equals to actual matched tx input")
+ }
+
+ spendOutputIDs := make(map[string]bool)
+ for _, input := range matchedTx.Inputs {
+ spendOutputID, err := input.SpentOutputID()
+ if err != nil {
+ return err
+ }
+
+ spendOutputIDs[spendOutputID.String()] = true
+ }
+
+ for _, input := range actualMatchedTx.Inputs {
+ spendOutputID, err := input.SpentOutputID()
+ if err != nil {
+ return err
+ }
+
+ if _, ok := spendOutputIDs[spendOutputID.String()]; !ok {
+ return errors.New("spend output id of matched tx is not equals to actual matched tx")
+ }
+ }
+ }
+ return nil
+}
+
+func getSortedTradePairsFromMatchedTx(tx *types.Tx) ([]*common.TradePair, error) {
+ assetMap := make(map[bc.AssetID]bc.AssetID)
+ var firstTradePair *common.TradePair
+ for _, tx := range tx.Inputs {
+ contractArgs, err := segwit.DecodeP2WMCProgram(tx.ControlProgram())
+ if err != nil {
+ return nil, err
+ }
+
+ assetMap[tx.AssetID()] = contractArgs.RequestedAsset
+ if firstTradePair == nil {
+ firstTradePair = &common.TradePair{FromAssetID: tx.AssetAmount().AssetId, ToAssetID: &contractArgs.RequestedAsset}
+ }
+ }
+
+ tradePairs := []*common.TradePair{firstTradePair}
+ for tradePair := firstTradePair; *tradePair.ToAssetID != *firstTradePair.FromAssetID; {
+ nextTradePairToAssetID, ok := assetMap[*tradePair.ToAssetID]
+ if !ok {
+ return nil, errInvalidTradePairs
+ }
+
+ tradePair = &common.TradePair{FromAssetID: tradePair.ToAssetID, ToAssetID: &nextTradePairToAssetID}
+ tradePairs = append(tradePairs, tradePair)
+ }
+
+ if len(tradePairs) != len(tx.Inputs) {
+ return nil, errInvalidTradePairs
+ }
+ return tradePairs, nil
+}
+
+// DetachBlock parse pending order and cancel from the the transactions of block
+// and add cancel order to the dex db, remove pending order from dex db.
+func (m *MovCore) DetachBlock(block *types.Block) error {
+ deleteOrders, addOrders, err := applyTransactions(block.Transactions)
+ if err != nil {
+ return err
+ }
+
+ return m.movStore.ProcessOrders(addOrders, deleteOrders, &block.BlockHeader)
+}
+
+// BeforeProposalBlock return all transactions than can be matched, and the number of transactions cannot exceed the given capacity.
+func (m *MovCore) BeforeProposalBlock(capacity int, nodeProgram []byte) ([]*types.Tx, error) {
+ matchEngine := match.NewEngine(m.movStore, maxFeeRate, nodeProgram)
+ tradePairMap := make(map[string]bool)
+ tradePairIterator := database.NewTradePairIterator(m.movStore)
+
+ var packagedTxs []*types.Tx
+ for len(packagedTxs) < capacity && tradePairIterator.HasNext() {
+ tradePair := tradePairIterator.Next()
+ if tradePairMap[tradePair.Key()] {
+ continue
+ }
+ tradePairMap[tradePair.Key()] = true
+ tradePairMap[tradePair.Reverse().Key()] = true
+
+ for len(packagedTxs) < capacity && matchEngine.HasMatchedTx(tradePair, tradePair.Reverse()) {
+ matchedTx, err := matchEngine.NextMatchedTx(tradePair, tradePair.Reverse())
+ if err != nil {
+ return nil, err
+ }
+
+ packagedTxs = append(packagedTxs, matchedTx)
+ }
+ }
+ return packagedTxs, nil
+}
+
+func (m *MovCore) IsDust(tx *types.Tx) bool {
+ for _, input := range tx.Inputs {
+ if segwit.IsP2WMCScript(input.ControlProgram()) && !contract.IsCancelClauseSelector(input) {
+ return true
+ }
+ }
+ return false
+}
+
+func applyTransactions(txs []*types.Tx) ([]*common.Order, []*common.Order, error) {
+ deleteOrderMap := make(map[string]*common.Order)
+ addOrderMap := make(map[string]*common.Order)
+ for _, tx := range txs {
+ addOrders, err := getAddOrdersFromTx(tx)
+ if err != nil {
+ return nil, nil, err
+ }
+
+ for _, order := range addOrders {
+ addOrderMap[order.Key()] = order
+ }
+
+ deleteOrders, err := getDeleteOrdersFromTx(tx)
+ if err != nil {
+ return nil, nil, err
+ }
+
+ for _, order := range deleteOrders {
+ deleteOrderMap[order.Key()] = order
+ }
+ }
+
+ addOrders, deleteOrders := mergeOrders(addOrderMap, deleteOrderMap)
+ return addOrders, deleteOrders, nil
+}
+
+func mergeOrders(addOrderMap, deleteOrderMap map[string]*common.Order) ([]*common.Order, []*common.Order) {
+ var deleteOrders, addOrders []*common.Order
+ for orderID, order := range addOrderMap {
+ if _, ok := deleteOrderMap[orderID]; ok {
+ delete(deleteOrderMap, orderID)
+ continue
+ }
+ addOrders = append(addOrders, order)
+ }
+
+ for _, order := range deleteOrderMap {
+ deleteOrders = append(deleteOrders, order)
+ }
+ return addOrders, deleteOrders
+}
+
+func getAddOrdersFromTx(tx *types.Tx) ([]*common.Order, error) {
+ var orders []*common.Order
+ for i, output := range tx.Outputs {
+ if output.OutputType() != types.IntraChainOutputType || !segwit.IsP2WMCScript(output.ControlProgram()) {
+ continue
+ }
+
+ order, err := common.NewOrderFromOutput(tx, i)
+ if err != nil {
+ return nil, err
+ }
+
+ orders = append(orders, order)
+ }
+ return orders, nil
+}
+
+func getDeleteOrdersFromTx(tx *types.Tx) ([]*common.Order, error) {
+ var orders []*common.Order
+ for i, input := range tx.Inputs {
+ if input.InputType() != types.SpendInputType || !segwit.IsP2WMCScript(input.ControlProgram()) {
+ continue
+ }
+
+ order, err := common.NewOrderFromInput(tx, i)
+ if err != nil {
+ return nil, err
+ }
+
+ orders = append(orders, order)
+ }
+ return orders, nil
+}
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