156 lines
3.5 KiB
Go
156 lines
3.5 KiB
Go
package core
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import (
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"bytes"
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"io"
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"github.com/CityOfZion/neo-go/pkg/core/transaction"
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"github.com/CityOfZion/neo-go/pkg/crypto"
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"github.com/CityOfZion/neo-go/pkg/util"
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log "github.com/sirupsen/logrus"
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)
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// Block represents one block in the chain.
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type Block struct {
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// The base of the block.
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BlockBase
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// Transaction list.
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Transactions []*transaction.Transaction `json:"tx"`
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// True if this block is created from trimmed data.
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Trimmed bool `json:"-"`
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}
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// Header returns the Header of the Block.
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func (b *Block) Header() *Header {
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return &Header{
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BlockBase: b.BlockBase,
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}
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}
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// rebuildMerkleRoot rebuild the merkleroot of the block.
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func (b *Block) rebuildMerkleRoot() error {
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hashes := make([]util.Uint256, len(b.Transactions))
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for i, tx := range b.Transactions {
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hashes[i] = tx.Hash()
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}
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merkle, err := crypto.NewMerkleTree(hashes)
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if err != nil {
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return err
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}
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b.MerkleRoot = merkle.Root()
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return nil
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}
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// Verify the integrity of the block.
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func (b *Block) Verify(full bool) bool {
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// The first TX has to be a miner transaction.
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if b.Transactions[0].Type != transaction.MinerType {
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return false
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}
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// If the first TX is a minerTX then all others cant.
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for _, tx := range b.Transactions[1:] {
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if tx.Type == transaction.MinerType {
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return false
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}
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}
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// TODO: When full is true, do a full verification.
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if full {
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log.Warn("full verification of blocks is not yet implemented")
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}
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return true
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}
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// NewBlockFromTrimmedBytes returns a new block from trimmed data.
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// This is commonly used to create a block from stored data.
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// Blocks created from trimmed data will have their Trimmed field
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// set to true.
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func NewBlockFromTrimmedBytes(b []byte) (*Block, error) {
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block := &Block{
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Trimmed: true,
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}
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r := bytes.NewReader(b)
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if err := block.decodeHashableFields(r); err != nil {
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return block, err
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}
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br := util.BinReader{R: r}
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var padding uint8
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br.ReadLE(&padding)
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if br.Err != nil {
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return block, br.Err
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}
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block.Script = &transaction.Witness{}
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if err := block.Script.DecodeBinary(r); err != nil {
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return block, err
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}
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lenTX := br.ReadVarUint()
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block.Transactions = make([]*transaction.Transaction, lenTX)
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for i := 0; i < int(lenTX); i++ {
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var hash util.Uint256
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br.ReadLE(&hash)
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block.Transactions[i] = transaction.NewTrimmedTX(hash)
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}
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return block, br.Err
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}
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// Trim returns a subset of the block data to save up space
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// in storage.
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// Notice that only the hashes of the transactions are stored.
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func (b *Block) Trim() ([]byte, error) {
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buf := new(bytes.Buffer)
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if err := b.encodeHashableFields(buf); err != nil {
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return nil, err
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}
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bw := util.BinWriter{W: buf}
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bw.WriteLE(uint8(1))
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if bw.Err != nil {
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return nil, bw.Err
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}
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if err := b.Script.EncodeBinary(buf); err != nil {
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return nil, err
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}
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bw.WriteVarUint(uint64(len(b.Transactions)))
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for _, tx := range b.Transactions {
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bw.WriteLE(tx.Hash())
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}
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if bw.Err != nil {
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return nil, bw.Err
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}
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return buf.Bytes(), nil
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}
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// DecodeBinary decodes the block from the given reader.
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func (b *Block) DecodeBinary(r io.Reader) error {
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if err := b.BlockBase.DecodeBinary(r); err != nil {
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return err
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}
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br := util.BinReader{R: r}
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lentx := br.ReadVarUint()
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if br.Err != nil {
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return br.Err
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}
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b.Transactions = make([]*transaction.Transaction, lentx)
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for i := 0; i < int(lentx); i++ {
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b.Transactions[i] = &transaction.Transaction{}
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if err := b.Transactions[i].DecodeBinary(r); err != nil {
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return err
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}
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}
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return nil
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}
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// EncodeBinary encodes the block to the given writer.
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func (b *Block) EncodeBinary(w io.Writer) error {
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return nil
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}
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