--- /dev/null
+package proposal
+
+import (
+ "sort"
+ "strconv"
+ "time"
+
+ log "github.com/sirupsen/logrus"
+
+ "github.com/vapor/account"
+ "github.com/vapor/blockchain/txbuilder"
+ "github.com/vapor/consensus"
+ "github.com/vapor/errors"
+ "github.com/vapor/protocol"
+ "github.com/vapor/protocol/bc"
+ "github.com/vapor/protocol/bc/types"
+ "github.com/vapor/protocol/state"
+ "github.com/vapor/protocol/validation"
+ "github.com/vapor/protocol/vm/vmutil"
+)
+
+const logModule = "mining"
+
+// createCoinbaseTx returns a coinbase transaction paying an appropriate subsidy
+// based on the passed block height to the provided address. When the address
+// is nil, the coinbase transaction will instead be redeemable by anyone.
+func createCoinbaseTx(accountManager *account.Manager, amount uint64, blockHeight uint64) (tx *types.Tx, err error) {
+ amount += consensus.BlockSubsidy(blockHeight)
+ arbitrary := append([]byte{0x00}, []byte(strconv.FormatUint(blockHeight, 10))...)
+
+ var script []byte
+ if accountManager == nil {
+ script, err = vmutil.DefaultCoinbaseProgram()
+ } else {
+ script, err = accountManager.GetCoinbaseControlProgram()
+ arbitrary = append(arbitrary, accountManager.GetCoinbaseArbitrary()...)
+ }
+ if err != nil {
+ return nil, err
+ }
+
+ if len(arbitrary) > consensus.CoinbaseArbitrarySizeLimit {
+ return nil, validation.ErrCoinbaseArbitraryOversize
+ }
+
+ builder := txbuilder.NewBuilder(time.Now())
+ if err = builder.AddInput(types.NewCoinbaseInput(arbitrary), &txbuilder.SigningInstruction{}); err != nil {
+ return nil, err
+ }
+ if err = builder.AddOutput(types.NewIntraChainOutput(*consensus.BTMAssetID, amount, script)); err != nil {
+ return nil, err
+ }
+ _, txData, err := builder.Build()
+ if err != nil {
+ return nil, err
+ }
+
+ byteData, err := txData.MarshalText()
+ if err != nil {
+ return nil, err
+ }
+ txData.SerializedSize = uint64(len(byteData))
+
+ tx = &types.Tx{
+ TxData: *txData,
+ Tx: types.MapTx(txData),
+ }
+ return tx, nil
+}
+
+// NewBlockTemplate returns a new block template that is ready to be solved
+func NewBlockTemplate(c *protocol.Chain, txPool *protocol.TxPool, accountManager *account.Manager) (b *types.Block, err error) {
+ view := state.NewUtxoViewpoint()
+ txStatus := bc.NewTransactionStatus()
+ if err := txStatus.SetStatus(0, false); err != nil {
+ return nil, err
+ }
+ txEntries := []*bc.Tx{nil}
+ gasUsed := uint64(0)
+ txFee := uint64(0)
+
+ // get preblock info for generate next block
+ preBlockHeader := c.BestBlockHeader()
+ preBlockHash := preBlockHeader.Hash()
+ nextBlockHeight := preBlockHeader.Height + 1
+
+ b = &types.Block{
+ BlockHeader: types.BlockHeader{
+ Version: 1,
+ Height: nextBlockHeight,
+ PreviousBlockHash: preBlockHash,
+ Timestamp: uint64(time.Now().UnixNano() / int64(time.Millisecond)),
+ BlockCommitment: types.BlockCommitment{},
+ },
+ }
+ bcBlock := &bc.Block{BlockHeader: &bc.BlockHeader{Height: nextBlockHeight}}
+ b.Transactions = []*types.Tx{nil}
+
+ txs := txPool.GetTransactions()
+ sort.Sort(byTime(txs))
+ for _, txDesc := range txs {
+ tx := txDesc.Tx.Tx
+ gasOnlyTx := false
+
+ if err := c.GetTransactionsUtxo(view, []*bc.Tx{tx}); err != nil {
+ blkGenSkipTxForErr(txPool, &tx.ID, err)
+ continue
+ }
+
+ gasStatus, err := validation.ValidateTx(tx, bcBlock)
+ if err != nil {
+ if !gasStatus.GasValid {
+ blkGenSkipTxForErr(txPool, &tx.ID, err)
+ continue
+ }
+ gasOnlyTx = true
+ }
+
+ if gasUsed+uint64(gasStatus.GasUsed) > consensus.MaxBlockGas {
+ break
+ }
+
+ if err := view.ApplyTransaction(bcBlock, tx, gasOnlyTx); err != nil {
+ blkGenSkipTxForErr(txPool, &tx.ID, err)
+ continue
+ }
+
+ if err := txStatus.SetStatus(len(b.Transactions), gasOnlyTx); err != nil {
+ return nil, err
+ }
+
+ b.Transactions = append(b.Transactions, txDesc.Tx)
+ txEntries = append(txEntries, tx)
+ gasUsed += uint64(gasStatus.GasUsed)
+ txFee += txDesc.Fee
+
+ if gasUsed == consensus.MaxBlockGas {
+ break
+ }
+ }
+
+ // creater coinbase transaction
+ b.Transactions[0], err = createCoinbaseTx(accountManager, txFee, nextBlockHeight)
+ if err != nil {
+ return nil, errors.Wrap(err, "fail on createCoinbaseTx")
+ }
+ txEntries[0] = b.Transactions[0].Tx
+
+ b.BlockHeader.BlockCommitment.TransactionsMerkleRoot, err = types.TxMerkleRoot(txEntries)
+ if err != nil {
+ return nil, err
+ }
+
+ b.BlockHeader.BlockCommitment.TransactionStatusHash, err = types.TxStatusMerkleRoot(txStatus.VerifyStatus)
+
+ _, err = c.GetBBFT().SignBlock(b)
+ return b, err
+}
+
+func blkGenSkipTxForErr(txPool *protocol.TxPool, txHash *bc.Hash, err error) {
+ log.WithFields(log.Fields{"module": logModule, "error": err}).Error("mining block generation: skip tx due to")
+ txPool.RemoveTransaction(txHash)
+}
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