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142 lines
4 KiB
Go
142 lines
4 KiB
Go
package block
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import (
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"fmt"
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"github.com/CityOfZion/neo-go/pkg/core/transaction"
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"github.com/CityOfZion/neo-go/pkg/crypto/hash"
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"github.com/CityOfZion/neo-go/pkg/io"
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"github.com/CityOfZion/neo-go/pkg/util"
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)
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// Base holds the base info of a block
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type Base struct {
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// Version of the block.
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Version uint32 `json:"version"`
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// hash of the previous block.
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PrevHash util.Uint256 `json:"previousblockhash"`
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// Root hash of a transaction list.
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MerkleRoot util.Uint256 `json:"merkleroot"`
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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 `json:"time"`
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// index/height of the block
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Index uint32 `json:"height"`
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// Random number also called nonce
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ConsensusData uint64 `json:"nonce"`
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// Contract address of the next miner
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NextConsensus util.Uint160 `json:"next_consensus"`
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// Padding that is fixed to 1
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_ uint8
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// Script used to validate the block
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Script transaction.Witness `json:"script"`
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// Hash of this block, created when binary encoded (double SHA256).
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hash util.Uint256
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// Hash of the block used to verify it (single SHA256).
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verificationHash util.Uint256
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}
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// Verify verifies the integrity of the Base.
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func (b *Base) Verify() bool {
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// TODO: Need a persisted blockchain for this.
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return true
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}
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// Hash returns the hash of the block.
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func (b *Base) Hash() util.Uint256 {
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if b.hash.Equals(util.Uint256{}) {
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b.createHash()
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}
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return b.hash
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}
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// VerificationHash returns the hash of the block used to verify it.
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func (b *Base) VerificationHash() util.Uint256 {
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if b.verificationHash.Equals(util.Uint256{}) {
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b.createHash()
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}
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return b.verificationHash
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}
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// DecodeBinary implements Serializable interface.
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func (b *Base) DecodeBinary(br *io.BinReader) {
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b.decodeHashableFields(br)
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padding := []byte{0}
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br.ReadBytes(padding)
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if padding[0] != 1 {
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br.Err = fmt.Errorf("format error: padding must equal 1 got %d", padding)
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return
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}
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b.Script.DecodeBinary(br)
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}
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// EncodeBinary implements Serializable interface
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func (b *Base) EncodeBinary(bw *io.BinWriter) {
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b.encodeHashableFields(bw)
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bw.WriteBytes([]byte{1})
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b.Script.EncodeBinary(bw)
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}
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// GetHashableData returns serialized hashable data of the block.
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func (b *Base) GetHashableData() []byte {
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buf := io.NewBufBinWriter()
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// No error can occure while encoding hashable fields.
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b.encodeHashableFields(buf.BinWriter)
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return buf.Bytes()
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}
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// createHash creates 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 *Base) createHash() {
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bb := b.GetHashableData()
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b.verificationHash = hash.Sha256(bb)
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b.hash = hash.Sha256(b.verificationHash.BytesBE())
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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 *Base) encodeHashableFields(bw *io.BinWriter) {
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bw.WriteU32LE(b.Version)
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bw.WriteBytes(b.PrevHash[:])
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bw.WriteBytes(b.MerkleRoot[:])
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bw.WriteU32LE(b.Timestamp)
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bw.WriteU32LE(b.Index)
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bw.WriteU64LE(b.ConsensusData)
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bw.WriteBytes(b.NextConsensus[:])
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}
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// decodeHashableFields decodes the fields used for hashing.
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// see Hash() for more information about the fields.
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func (b *Base) decodeHashableFields(br *io.BinReader) {
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b.Version = br.ReadU32LE()
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br.ReadBytes(b.PrevHash[:])
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br.ReadBytes(b.MerkleRoot[:])
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b.Timestamp = br.ReadU32LE()
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b.Index = br.ReadU32LE()
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b.ConsensusData = br.ReadU64LE()
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br.ReadBytes(b.NextConsensus[:])
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// Make the hash of the block here so we dont need to do this
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// again.
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if br.Err == nil {
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b.createHash()
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}
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}
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