forked from laizy/ontology-old
/
block.go
163 lines (140 loc) · 3.86 KB
/
block.go
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/*
* Copyright (C) 2018 The ontology Authors
* This file is part of The ontology library.
*
* The ontology is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ontology is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The ontology. If not, see <http://www.gnu.org/licenses/>.
*/
package types
import (
"bytes"
"fmt"
"io"
"github.com/ontio/ontology/common"
"github.com/ontio/ontology/common/serialization"
)
type Block struct {
Header *Header
Transactions []*Transaction
hash *common.Uint256
}
func (b *Block) Serialize(w io.Writer) error {
b.Header.Serialize(w)
err := serialization.WriteUint32(w, uint32(len(b.Transactions)))
if err != nil {
return fmt.Errorf("Block item Transactions length serialization failed: %s", err)
}
for _, transaction := range b.Transactions {
transaction.Serialize(w)
}
return nil
}
func (b *Block) Deserialize(r io.Reader) error {
if b.Header == nil {
b.Header = new(Header)
}
b.Header.Deserialize(r)
//Transactions
length, err := serialization.ReadUint32(r)
if err != nil {
return err
}
var tharray = make([]common.Uint256, 0, length)
for i := uint32(0); i < length; i++ {
transaction := new(Transaction)
transaction.Deserialize(r)
txhash := transaction.Hash()
b.Transactions = append(b.Transactions, transaction)
tharray = append(tharray, txhash)
}
b.Header.TransactionsRoot, err = common.ComputeRoot(tharray)
if err != nil {
return fmt.Errorf("Block Deserialize merkleTree compute failed: %s", err)
}
return nil
}
func (b *Block) Trim(w io.Writer) error {
b.Header.Serialize(w)
err := serialization.WriteUint32(w, uint32(len(b.Transactions)))
if err != nil {
return fmt.Errorf("Block item Transactions length serialization failed: %s", err)
}
for _, transaction := range b.Transactions {
temp := *transaction
hash := temp.Hash()
hash.Serialize(w)
}
return nil
}
func (b *Block) FromTrimmedData(r io.Reader) error {
if b.Header == nil {
b.Header = new(Header)
}
b.Header.Deserialize(r)
//Transactions
var i uint32
Len, err := serialization.ReadUint32(r)
if err != nil {
return err
}
var txhash common.Uint256
var tharray []common.Uint256
for i = 0; i < Len; i++ {
txhash.Deserialize(r)
transaction := new(Transaction)
transaction.SetHash(txhash)
b.Transactions = append(b.Transactions, transaction)
tharray = append(tharray, txhash)
}
b.Header.TransactionsRoot, err = common.ComputeRoot(tharray)
if err != nil {
return fmt.Errorf("Block Deserialize merkleTree compute failed: %s", err)
}
return nil
}
func (b *Block) GetMessage() []byte {
bf := new(bytes.Buffer)
b.SerializeUnsigned(bf)
return bf.Bytes()
}
func (b *Block) ToArray() []byte {
bf := new(bytes.Buffer)
b.Serialize(bf)
return bf.Bytes()
}
func (b *Block) Hash() common.Uint256 {
if b.hash == nil {
b.hash = new(common.Uint256)
*b.hash = b.Header.Hash()
}
return *b.hash
}
func (b *Block) Type() common.InventoryType {
return common.BLOCK
}
func (b *Block) RebuildMerkleRoot() error {
txs := b.Transactions
transactionHashes := []common.Uint256{}
for _, tx := range txs {
transactionHashes = append(transactionHashes, tx.Hash())
}
hash, err := common.ComputeRoot(transactionHashes)
if err != nil {
return fmt.Errorf("[Block] , RebuildMerkleRoot ComputeRoot failed: %s", err)
}
b.Header.TransactionsRoot = hash
return nil
}
func (bd *Block) SerializeUnsigned(w io.Writer) error {
return bd.Header.SerializeUnsigned(w)
}