mining/mining.go

   1 package mining
   2
   3 import (
   4         "encoding/binary"
   5         "encoding/json"
   6         "sort"
   7         "strconv"
   8         "time"
   9
  10         "github.com/vapor/common"
  11
  12         log "github.com/sirupsen/logrus"
  13
  14         "github.com/vapor/account"
  15         "github.com/vapor/blockchain/txbuilder"
  16         "github.com/vapor/config"
  17         "github.com/vapor/consensus"
  18         engine "github.com/vapor/consensus/consensus"
  19         "github.com/vapor/crypto/ed25519/chainkd"
  20         "github.com/vapor/errors"
  21         "github.com/vapor/protocol"
  22         "github.com/vapor/protocol/bc"
  23         "github.com/vapor/protocol/bc/types"
  24         "github.com/vapor/protocol/state"
  25         "github.com/vapor/protocol/validation"
  26         "github.com/vapor/protocol/vm/vmutil"
  27 )
  28
  29 // createCoinbaseTx returns a coinbase transaction paying an appropriate subsidy
  30 // based on the passed block height to the provided address.  When the address
  31 // is nil, the coinbase transaction will instead be redeemable by anyone.
  32 func createCoinbaseTx(accountManager *account.Manager, amount uint64, blockHeight uint64, delegateInfo engine.DelegateInfo, timestamp uint64) (tx *types.Tx, err error) {
  33         //amount += consensus.BlockSubsidy(blockHeight)
  34         arbitrary := append([]byte{0x00}, []byte(strconv.FormatUint(blockHeight, 10))...)
  35
  36         var script []byte
  37         address, _ := common.DecodeAddress(config.CommonConfig.Consensus.Dpos.Coinbase, &consensus.ActiveNetParams)
  38         redeemContract := address.ScriptAddress()
  39         script, _ = vmutil.P2WPKHProgram(redeemContract)
  40
  41         if err != nil {
  42                 return nil, err
  43         }
  44
  45         if len(arbitrary) > consensus.CoinbaseArbitrarySizeLimit {
  46                 return nil, validation.ErrCoinbaseArbitraryOversize
  47         }
  48
  49         builder := txbuilder.NewBuilder(time.Now())
  50         if err = builder.AddInput(types.NewCoinbaseInput(arbitrary), &txbuilder.SigningInstruction{}); err != nil {
  51                 return nil, err
  52         }
  53
  54         if err = builder.AddOutput(types.NewTxOutput(*consensus.BTMAssetID, amount, script)); err != nil {
  55                 return nil, err
  56         }
  57         _, txData, err := builder.Build()
  58         if err != nil {
  59                 return nil, err
  60         }
  61
  62         byteData, err := txData.MarshalText()
  63         if err != nil {
  64                 return nil, err
  65         }
  66         txData.SerializedSize = uint64(len(byteData))
  67
  68         delegates := engine.DelegateInfoList{}
  69         delegates.Delegate = delegateInfo
  70
  71         var xPrv chainkd.XPrv
  72         if config.CommonConfig.Consensus.Dpos.XPrv == "" {
  73                 return nil, errors.New("Signer is empty")
  74         }
  75         xPrv.UnmarshalText([]byte(config.CommonConfig.Consensus.Dpos.XPrv))
  76
  77         buf := [8]byte{}
  78         binary.LittleEndian.PutUint64(buf[:], timestamp)
  79         delegates.SigTime = xPrv.Sign(buf)
  80         delegates.Xpub = xPrv.XPub()
  81
  82         data, err := json.Marshal(&delegates)
  83         if err != nil {
  84                 return nil, err
  85         }
  86
  87         txData.ReferenceData = data
  88
  89         tx = &types.Tx{
  90                 TxData: *txData,
  91                 Tx:     types.MapTx(txData),
  92         }
  93         return tx, nil
  94 }
  95
  96 // NewBlockTemplate returns a new block template that is ready to be solved
  97 func NewBlockTemplate(c *protocol.Chain, txPool *protocol.TxPool, accountManager *account.Manager, engine engine.Engine, delegateInfo engine.DelegateInfo) (b *types.Block, err error) {
  98         view := state.NewUtxoViewpoint()
  99         txStatus := bc.NewTransactionStatus()
 100         if err := txStatus.SetStatus(0, false); err != nil {
 101                 return nil, err
 102         }
 103         txEntries := []*bc.Tx{nil}
 104         gasUsed := uint64(0)
 105         txFee := uint64(0)
 106
 107         // get preblock info for generate next block
 108         preBlockHeader := c.BestBlockHeader()
 109         preBlockHash := preBlockHeader.Hash()
 110         nextBlockHeight := preBlockHeader.Height + 1
 111
 112         var xPrv chainkd.XPrv
 113         if config.CommonConfig.Consensus.Dpos.XPrv == "" {
 114                 return nil, errors.New("Signer is empty")
 115         }
 116         xPrv.UnmarshalText([]byte(config.CommonConfig.Consensus.Dpos.XPrv))
 117         xpub, _ := xPrv.XPub().MarshalText()
 118
 119         header := types.BlockHeader{
 120                 Version:           1,
 121                 Height:            nextBlockHeight,
 122                 PreviousBlockHash: preBlockHash,
 123                 Timestamp:         uint64(time.Now().Unix()),
 124                 BlockCommitment:   types.BlockCommitment{},
 125                 Coinbase:          xpub,
 126         }
 127
 128         if err := engine.Prepare(c, &header); err != nil {
 129                 log.Error("Failed to prepare header for mining", "err", err)
 130                 return nil, err
 131         }
 132
 133         b = &types.Block{}
 134         bcBlock := &bc.Block{BlockHeader: &bc.BlockHeader{Height: nextBlockHeight}}
 135         b.Transactions = []*types.Tx{nil}
 136
 137         txs := txPool.GetTransactions()
 138         sort.Sort(byTime(txs))
 139         for _, txDesc := range txs {
 140                 tx := txDesc.Tx.Tx
 141                 gasOnlyTx := false
 142
 143                 if err := c.GetTransactionsUtxo(view, []*bc.Tx{tx}); err != nil {
 144                         blkGenSkipTxForErr(txPool, &tx.ID, err)
 145                         continue
 146                 }
 147                 gasStatus, err := validation.ValidateTx(tx, bcBlock)
 148                 if err != nil {
 149                         if !gasStatus.GasValid {
 150                                 blkGenSkipTxForErr(txPool, &tx.ID, err)
 151                                 continue
 152                         }
 153                         gasOnlyTx = true
 154                 }
 155
 156                 if gasUsed+uint64(gasStatus.GasUsed) > consensus.MaxBlockGas {
 157                         break
 158                 }
 159
 160                 if err := view.ApplyTransaction(bcBlock, tx, gasOnlyTx); err != nil {
 161                         blkGenSkipTxForErr(txPool, &tx.ID, err)
 162                         continue
 163                 }
 164
 165                 if err := txStatus.SetStatus(len(b.Transactions), gasOnlyTx); err != nil {
 166                         return nil, err
 167                 }
 168
 169                 b.Transactions = append(b.Transactions, txDesc.Tx)
 170                 txEntries = append(txEntries, tx)
 171                 gasUsed += uint64(gasStatus.GasUsed)
 172                 txFee += txDesc.Fee
 173                 if gasUsed == consensus.MaxBlockGas {
 174                         break
 175                 }
 176         }
 177
 178         if err := engine.Finalize(c, &header, txEntries[1:]); err != nil {
 179                 return nil, err
 180         }
 181
 182         b.BlockHeader = header
 183         // creater coinbase transaction
 184         b.Transactions[0], err = createCoinbaseTx(accountManager, txFee, nextBlockHeight, delegateInfo, bcBlock.Timestamp)
 185         if err != nil {
 186                 return nil, errors.Wrap(err, "fail on createCoinbaseTx")
 187         }
 188         txEntries[0] = b.Transactions[0].Tx
 189
 190         b.BlockHeader.BlockCommitment.TransactionsMerkleRoot, err = types.TxMerkleRoot(txEntries)
 191         if err != nil {
 192                 return nil, err
 193         }
 194
 195         b.BlockHeader.BlockCommitment.TransactionStatusHash, err = types.TxStatusMerkleRoot(txStatus.VerifyStatus)
 196         return b, err
 197 }
 198
 199 func blkGenSkipTxForErr(txPool *protocol.TxPool, txHash *bc.Hash, err error) {
 200         log.WithField("error", err).Error("mining block generation: skip tx due to")
 201         txPool.RemoveTransaction(txHash)
 202 }