forked from TrueCloudLab/neoneo-go
115 lines
3.3 KiB
Go
115 lines
3.3 KiB
Go
package core
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import (
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"bytes"
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"crypto/sha256"
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"encoding/binary"
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"io"
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. "github.com/CityOfZion/neo-go/pkg/util"
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)
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// BlockBase holds the base info of a block
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type BlockBase struct {
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Version uint32
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// hash of the previous block.
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PrevBlock Uint256
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// Root hash of a transaction list.
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MerkleRoot Uint256
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// The time stamp of each block must be later than previous block's time stamp.
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// Generally the difference of two block's time stamp is about 15 seconds and imprecision is allowed.
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// The height of the block must be exactly equal to the height of the previous block plus 1.
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Timestamp uint32
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// height of the block
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Height uint32
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// Random number
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Nonce uint64
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// contract addresss of the next miner
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NextMiner Uint160
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// fixed to 1
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_sep uint8
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// Script used to validate the block
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Script *Witness
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}
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// BlockHead holds the head info of a block
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type BlockHead struct {
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BlockBase
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// fixed to 0
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_sep1 uint8
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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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BlockBase
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// transaction list
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Transactions []*Transaction
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}
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// encodeHashableFields will only encode the fields used for hashing.
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// see Hash() for more information about the fields.
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func (b *Block) encodeHashableFields(w io.Writer) error {
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err := binary.Write(w, binary.LittleEndian, &b.Version)
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err = binary.Write(w, binary.LittleEndian, &b.PrevBlock)
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err = binary.Write(w, binary.LittleEndian, &b.MerkleRoot)
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err = binary.Write(w, binary.LittleEndian, &b.Timestamp)
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err = binary.Write(w, binary.LittleEndian, &b.Height)
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err = binary.Write(w, binary.LittleEndian, &b.Nonce)
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err = binary.Write(w, binary.LittleEndian, &b.NextMiner)
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return err
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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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// DecodeBinary decods the block from the given reader.
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func (b *Block) DecodeBinary(r io.Reader) error {
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err := binary.Read(r, binary.LittleEndian, &b.Version)
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err = binary.Read(r, binary.LittleEndian, &b.PrevBlock)
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err = binary.Read(r, binary.LittleEndian, &b.MerkleRoot)
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err = binary.Read(r, binary.LittleEndian, &b.Timestamp)
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err = binary.Read(r, binary.LittleEndian, &b.Height)
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err = binary.Read(r, binary.LittleEndian, &b.Nonce)
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err = binary.Read(r, binary.LittleEndian, &b.NextMiner)
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err = binary.Read(r, binary.LittleEndian, &b._sep)
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b.Script = &Witness{}
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if err := b.Script.DecodeBinary(r); err != nil {
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return err
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}
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var lentx uint8
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err = binary.Read(r, binary.LittleEndian, &lentx)
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b.Transactions = make([]*Transaction, lentx)
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for i := 0; i < int(lentx); i++ {
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tx := &Transaction{}
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if err := tx.DecodeBinary(r); err != nil {
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return err
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}
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b.Transactions[i] = tx
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}
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return err
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}
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// Hash return the hash of the block.
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// When calculating the hash value of the block, instead of calculating the entire block,
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// only first seven fields in the block head will be calculated, which are
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// version, PrevBlock, MerkleRoot, timestamp, and height, the nonce, NextMiner.
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// Since MerkleRoot already contains the hash value of all transactions,
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// the modification of transaction will influence the hash value of the block.
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func (b *Block) Hash() (hash Uint256, err 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
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}
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hash = sha256.Sum256(buf.Bytes())
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return
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}
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// Size implements the payload interface.
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func (b *Block) Size() uint32 { return 0 }
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