8 log "github.com/sirupsen/logrus"
10 "github.com/bytom/bytom/account"
11 "github.com/bytom/bytom/blockchain/txbuilder"
12 "github.com/bytom/bytom/consensus"
13 "github.com/bytom/bytom/errors"
14 "github.com/bytom/bytom/protocol"
15 "github.com/bytom/bytom/protocol/bc"
16 "github.com/bytom/bytom/protocol/bc/types"
17 "github.com/bytom/bytom/protocol/state"
18 "github.com/bytom/bytom/protocol/validation"
19 "github.com/bytom/bytom/protocol/vm/vmutil"
22 const logModule = "mining"
24 // createCoinbaseTx returns a coinbase transaction paying an appropriate subsidy
25 // based on the passed block height to the provided address. When the address
26 // is nil, the coinbase transaction will instead be redeemable by anyone.
27 func createCoinbaseTx(accountManager *account.Manager, amount uint64, blockHeight uint64) (tx *types.Tx, err error) {
28 amount += consensus.BlockSubsidy(blockHeight)
29 arbitrary := append([]byte{0x00}, []byte(strconv.FormatUint(blockHeight, 10))...)
32 if accountManager == nil {
33 script, err = vmutil.DefaultCoinbaseProgram()
35 script, err = accountManager.GetCoinbaseControlProgram()
36 arbitrary = append(arbitrary, accountManager.GetCoinbaseArbitrary()...)
42 if len(arbitrary) > consensus.CoinbaseArbitrarySizeLimit {
43 return nil, validation.ErrCoinbaseArbitraryOversize
46 builder := txbuilder.NewBuilder(time.Now())
47 if err = builder.AddInput(types.NewCoinbaseInput(arbitrary), &txbuilder.SigningInstruction{}); err != nil {
50 if err = builder.AddOutput(types.NewTxOutput(*consensus.BTMAssetID, amount, script)); err != nil {
53 _, txData, err := builder.Build()
58 byteData, err := txData.MarshalText()
62 txData.SerializedSize = uint64(len(byteData))
66 Tx: types.MapTx(txData),
71 // NewBlockTemplate returns a new block template that is ready to be solved
72 func NewBlockTemplate(c *protocol.Chain, txPool *protocol.TxPool, accountManager *account.Manager) (b *types.Block, err error) {
73 view := state.NewUtxoViewpoint()
74 txStatus := bc.NewTransactionStatus()
75 if err := txStatus.SetStatus(0, false); err != nil {
78 txEntries := []*bc.Tx{nil}
82 // get preblock info for generate next block
83 preBlockHeader := c.BestBlockHeader()
84 preBlockHash := preBlockHeader.Hash()
85 nextBlockHeight := preBlockHeader.Height + 1
86 nextBits, err := c.CalcNextBits(&preBlockHash)
92 BlockHeader: types.BlockHeader{
94 Height: nextBlockHeight,
95 PreviousBlockHash: preBlockHash,
96 Timestamp: uint64(time.Now().Unix()),
97 BlockCommitment: types.BlockCommitment{},
101 bcBlock := &bc.Block{BlockHeader: &bc.BlockHeader{Height: nextBlockHeight}}
102 b.Transactions = []*types.Tx{nil}
104 txs := txPool.GetTransactions()
105 sort.Sort(byTime(txs))
106 for _, txDesc := range txs {
110 if err := c.GetTransactionsUtxo(view, []*bc.Tx{tx}); err != nil {
111 blkGenSkipTxForErr(txPool, &tx.ID, err)
115 gasStatus, err := validation.ValidateTx(tx, bcBlock)
117 if !gasStatus.GasValid {
118 blkGenSkipTxForErr(txPool, &tx.ID, err)
124 if gasUsed+uint64(gasStatus.GasUsed) > consensus.MaxBlockGas {
128 if err := view.ApplyTransaction(bcBlock, tx, gasOnlyTx); err != nil {
129 blkGenSkipTxForErr(txPool, &tx.ID, err)
133 if err := txStatus.SetStatus(len(b.Transactions), gasOnlyTx); err != nil {
137 b.Transactions = append(b.Transactions, txDesc.Tx)
138 txEntries = append(txEntries, tx)
139 gasUsed += uint64(gasStatus.GasUsed)
142 if gasUsed == consensus.MaxBlockGas {
147 // creater coinbase transaction
148 b.Transactions[0], err = createCoinbaseTx(accountManager, txFee, nextBlockHeight)
150 return nil, errors.Wrap(err, "fail on createCoinbaseTx")
152 txEntries[0] = b.Transactions[0].Tx
154 b.BlockHeader.BlockCommitment.TransactionsMerkleRoot, err = types.TxMerkleRoot(txEntries)
159 b.BlockHeader.BlockCommitment.TransactionStatusHash, err = types.TxStatusMerkleRoot(txStatus.VerifyStatus)
163 func blkGenSkipTxForErr(txPool *protocol.TxPool, txHash *bc.Hash, err error) {
164 log.WithFields(log.Fields{"module": logModule, "error": err}).Error("mining block generation: skip tx due to")
165 txPool.RemoveTransaction(txHash)