--- /dev/null
+package proposal
+
+import (
+ "sort"
+ "strconv"
+ "time"
+
+ log "github.com/sirupsen/logrus"
+
+ "github.com/bytom/bytom/account"
+ "github.com/bytom/bytom/blockchain/txbuilder"
+ "github.com/bytom/bytom/consensus"
+ "github.com/bytom/bytom/errors"
+ "github.com/bytom/bytom/protocol"
+ "github.com/bytom/bytom/protocol/bc"
+ "github.com/bytom/bytom/protocol/bc/types"
+ "github.com/bytom/bytom/protocol/state"
+ "github.com/bytom/bytom/protocol/validation"
+ "github.com/bytom/bytom/protocol/vm/vmutil"
+)
+
+const (
+ logModule = "proposal"
+ batchApplyNum = 16
+ softMaxTxNum = 128
+
+ timeoutOk = iota + 1
+ timeoutWarn
+ timeoutCritical
+)
+
+// NewBlockTemplate returns a new block template that is ready to be solved
+func NewBlockTemplate(chain *protocol.Chain, accountManager *account.Manager, timestamp uint64, warnDuration, criticalDuration time.Duration) (*types.Block, error) {
+ builder := newBlockBuilder(chain, accountManager, timestamp, warnDuration, criticalDuration)
+ return builder.build()
+}
+
+type blockBuilder struct {
+ chain *protocol.Chain
+ accountManager *account.Manager
+
+ block *types.Block
+ utxoView *state.UtxoViewpoint
+
+ warnTimeoutCh <-chan time.Time
+ criticalTimeoutCh <-chan time.Time
+ timeoutStatus uint8
+ gasLeft int64
+}
+
+func newBlockBuilder(chain *protocol.Chain, accountManager *account.Manager, timestamp uint64, warnDuration, criticalDuration time.Duration) *blockBuilder {
+ preBlockHeader := chain.BestBlockHeader()
+ block := &types.Block{
+ BlockHeader: types.BlockHeader{
+ Version: 1,
+ Height: preBlockHeader.Height + 1,
+ PreviousBlockHash: preBlockHeader.Hash(),
+ Timestamp: timestamp,
+ BlockCommitment: types.BlockCommitment{},
+ BlockWitness: make([]byte, protocol.SignatureLength),
+ },
+ }
+
+ builder := &blockBuilder{
+ chain: chain,
+ accountManager: accountManager,
+ block: block,
+ utxoView: state.NewUtxoViewpoint(),
+ warnTimeoutCh: time.After(warnDuration),
+ criticalTimeoutCh: time.After(criticalDuration),
+ gasLeft: int64(consensus.MaxBlockGas),
+ timeoutStatus: timeoutOk,
+ }
+ return builder
+}
+
+func (b *blockBuilder) build() (*types.Block, error) {
+ if err := b.applyCoinbaseTransaction(); err != nil {
+ return nil, err
+ }
+
+ if err := b.applyTransactionFromPool(); err != nil {
+ return nil, err
+ }
+
+ if err := b.calculateBlockCommitment(); err != nil {
+ return nil, err
+ }
+
+ b.chain.SignBlockHeader(&b.block.BlockHeader)
+ return b.block, nil
+}
+
+func (b *blockBuilder) applyCoinbaseTransaction() error {
+ coinbaseTx, err := b.createCoinbaseTx()
+ if err != nil {
+ return errors.Wrap(err, "fail on create coinbase tx")
+ }
+
+ gasState, err := validation.ValidateTx(coinbaseTx.Tx, &bc.Block{BlockHeader: &bc.BlockHeader{Height: b.block.Height}, Transactions: []*bc.Tx{coinbaseTx.Tx}}, b.chain.ProgramConverter)
+ if err != nil {
+ return err
+ }
+
+ b.block.Transactions = append(b.block.Transactions, coinbaseTx)
+ b.gasLeft -= gasState.GasUsed
+ return nil
+}
+
+func (b *blockBuilder) applyTransactionFromPool() error {
+ txDescList := b.chain.GetTxPool().GetTransactions()
+ sort.Sort(byTime(txDescList))
+
+ poolTxs := make([]*types.Tx, len(txDescList))
+ for i, txDesc := range txDescList {
+ poolTxs[i] = txDesc.Tx
+ }
+
+ return b.applyTransactions(poolTxs, timeoutWarn)
+}
+
+func (b *blockBuilder) calculateBlockCommitment() (err error) {
+ var txEntries []*bc.Tx
+ for _, tx := range b.block.Transactions {
+ txEntries = append(txEntries, tx.Tx)
+ }
+
+ b.block.BlockHeader.BlockCommitment.TransactionsMerkleRoot, err = types.TxMerkleRoot(txEntries)
+ if err != nil {
+ return err
+ }
+
+ return nil
+}
+
+// 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 (b *blockBuilder) createCoinbaseTx() (tx *types.Tx, err error) {
+ arbitrary := append([]byte{0x00}, []byte(strconv.FormatUint(b.block.Height, 10))...)
+ var script []byte
+ if b.accountManager == nil {
+ script, err = vmutil.DefaultCoinbaseProgram()
+ } else {
+ script, err = b.accountManager.GetCoinbaseControlProgram()
+ arbitrary = append(arbitrary, b.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.NewOriginalTxOutput(*consensus.BTMAssetID, 0, script)); err != nil {
+ return nil, err
+ }
+ //TODO: calculate reward to proposer
+
+ _, 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
+}
+
+func (b *blockBuilder) applyTransactions(txs []*types.Tx, timeoutStatus uint8) error {
+ batchTxs := []*types.Tx{}
+ for i := 0; i < len(txs); i++ {
+ if batchTxs = append(batchTxs, txs[i]); len(batchTxs) < batchApplyNum && i != len(txs)-1 {
+ continue
+ }
+
+ results, gasLeft := b.preValidateTxs(batchTxs, b.chain, b.utxoView, b.gasLeft)
+ for _, result := range results {
+ if result.err != nil {
+ log.WithFields(log.Fields{"module": logModule, "error": result.err}).Error("propose block generation: skip tx due to")
+ b.chain.GetTxPool().RemoveTransaction(&result.tx.ID)
+ continue
+ }
+
+ b.block.Transactions = append(b.block.Transactions, result.tx)
+ }
+
+ b.gasLeft = gasLeft
+ batchTxs = batchTxs[:0]
+ if b.getTimeoutStatus() >= timeoutStatus || len(b.block.Transactions) > softMaxTxNum {
+ break
+ }
+ }
+ return nil
+}
+
+type validateTxResult struct {
+ tx *types.Tx
+ err error
+}
+
+func (b *blockBuilder) preValidateTxs(txs []*types.Tx, chain *protocol.Chain, view *state.UtxoViewpoint, gasLeft int64) ([]*validateTxResult, int64) {
+ var results []*validateTxResult
+ bcBlock := &bc.Block{BlockHeader: &bc.BlockHeader{Height: chain.BestBlockHeight() + 1}}
+ bcTxs := make([]*bc.Tx, len(txs))
+ for i, tx := range txs {
+ bcTxs[i] = tx.Tx
+ }
+
+ validateResults := validation.ValidateTxs(bcTxs, bcBlock, b.chain.ProgramConverter)
+ for i := 0; i < len(validateResults) && gasLeft > 0; i++ {
+ gasStatus := validateResults[i].GetGasState()
+ if err := validateResults[i].GetError(); err != nil {
+ results = append(results, &validateTxResult{tx: txs[i], err: err})
+ continue
+ }
+
+ if err := chain.GetTransactionsUtxo(view, []*bc.Tx{bcTxs[i]}); err != nil {
+ results = append(results, &validateTxResult{tx: txs[i], err: err})
+ continue
+ }
+
+ if gasLeft-gasStatus.GasUsed < 0 {
+ break
+ }
+
+ if err := view.ApplyTransaction(bcBlock, bcTxs[i]); err != nil {
+ results = append(results, &validateTxResult{tx: txs[i], err: err})
+ continue
+ }
+
+ results = append(results, &validateTxResult{tx: txs[i], err: validateResults[i].GetError()})
+ gasLeft -= gasStatus.GasUsed
+ }
+ return results, gasLeft
+}
+
+func (b *blockBuilder) getTimeoutStatus() uint8 {
+ if b.timeoutStatus == timeoutCritical {
+ return b.timeoutStatus
+ }
+
+ select {
+ case <-b.criticalTimeoutCh:
+ b.timeoutStatus = timeoutCritical
+ case <-b.warnTimeoutCh:
+ b.timeoutStatus = timeoutWarn
+ default:
+ }
+
+ return b.timeoutStatus
+}
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