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| package main
import (
"./base58"
"bytes"
"fmt"
"github.com/boltdb/bolt"
"log"
"os"
)
type BlockChain struct {
db *bolt.DB
tail []byte
}
const blockChainName = "blockChain.db"
const blockBucketName = "blockBucket"
const lastHashKey = "lastHashKey"
func CreateBlockChain(miner string) *BlockChain {
if IsFileExist(blockChainName) {
fmt.Printf("区块链已经存在，不需要重复创建\n")
return nil
}
db, err := bolt.Open(blockChainName, 0600, nil)
if err != nil {
log.Panic(err)
}
var tail []byte
db.Update(func(tx *bolt.Tx) error {
b, err := tx.CreateBucket([]byte(blockBucketName))
if err != nil {
log.Panic(err)
}
coinbase := NewCoinbaseTX(miner, genesisInfo)
genesisBlock := NewBlock([]*Transaction{coinbase}, []byte{})
b.Put(genesisBlock.Hash, genesisBlock.Serialize() )
b.Put([]byte(lastHashKey), genesisBlock.Hash)
tail = genesisBlock.Hash
return nil
})
return &BlockChain{
db: db,
tail: tail,
}
}
func NewBlockChain() *BlockChain {
if !IsFileExist(blockChainName) {
fmt.Printf("区块链不存在，请创建区块链\n")
return nil
}
db, err := bolt.Open(blockChainName, 0600, nil)
if err != nil {
log.Panic(err)
}
var tail []byte
db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(blockBucketName))
if b == nil {
fmt.Printf("区块链bucket为空，请检查")
os.Exit(1)
}
tail = b.Get([]byte(lastHashKey))
return nil
})
return &BlockChain{
db: db,
tail: tail,
}
}
func (bc *BlockChain) AddBlock(txs []*Transaction) {
bc.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(blockBucketName))
if b == nil {
fmt.Println("bucket不存在，请检查")
os.Exit(1)
}
block := NewBlock(txs, bc.tail)
b.Put(block.Hash, block.Serialize() )
b.Put([]byte(lastHashKey), block.Hash)
bc.tail = block.Hash
return nil
})
}
type BlockChainIterator struct {
db *bolt.DB
current []byte
}
func (bc *BlockChain) NewIterator() *BlockChainIterator {
return &BlockChainIterator{
db: bc.db,
current: bc.tail,
}
}
func (it *BlockChainIterator) Next() *Block {
var block Block
it.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(blockBucketName))
if b == nil {
fmt.Println("bucket不存在,请检查")
os.Exit(1)
}
blockInfo := b.Get(it.current)
block = *DeSerialize(blockInfo)
it.current = block.PrevBlockHash
return nil
})
return &block
}
type UTXOInfo struct {
TXID []byte
Index int64
Output TXOutput
}
func (bc *BlockChain) FindMyUtxos(pubKeyHash []byte) []UTXOInfo {
fmt.Printf("FindMuUtxos\n")
var UTXOInfos []UTXOInfo
it := bc.NewIterator()
spentUTXOs := make(map[string][]int64)
for {
block := it.Next()
for _, tx := range block.Transactions {
if tx.IsCoinbase() == false {
for _, input := range tx.TXInputs {
if bytes.Equal(HashPubKey(input.pubKey), pubKeyHash) {
fmt.Printf("找到了消耗过的output , index : %d\n", input.Index)
key := string(input.TXID)
spentUTXOs[key] = append(spentUTXOs[key], input.Index)
}
}
}
OUTPUT:
for i, output := range tx.TXOutputs {
key := string(tx.TXid)
indexes := spentUTXOs[key]
if len(indexes) != 0 {
fmt.Printf("找到了当前这笔交易中有被消耗过的output\n")
for _, j := range indexes {
if int64(i) == j {
fmt.Printf("i == j , 当前的output已经被消耗了，跳过不统计\n")
continue OUTPUT
}
}
}
if bytes.Equal(pubKeyHash, output.PubKeyHash) {
utxoinfo := UTXOInfo{
TXID: tx.TXid,
Index: int64(i),
Output: output,
}
UTXOInfos = append(UTXOInfos, utxoinfo)
}
}
}
if len(block.PrevBlockHash) == 0 {
fmt.Printf("遍历区块链结束\n")
break
}
}
return UTXOInfos
}
func (bc *BlockChain) GetBalance(address string) {
decodeInfo, err := base58.Decode(address)
if err != nil {
log.Panic(err)
}
pubKeyHash := decodeInfo[1 : len(decodeInfo)-4]
utxoinfos := bc.FindMyUtxos(pubKeyHash)
var total = 0.0
for _, utxoinfo := range utxoinfos {
total += utxoinfo.Output.Value
}
fmt.Printf("%s的余额为%f", address, total)
}
func (bc *BlockChain) FindNeedUtxos(pubKeyHash []byte, amount float64) (map[string][]int64, float64) {
needUtxos := make(map[string][]int64)
var resValue float64
utxoinfos := bc.FindMyUtxos(pubKeyHash)
for _, utxoinfo := range utxoinfos {
key := string(utxoinfo.TXID)
needUtxos[key] = append(needUtxos[key], utxoinfo.Index)
resValue += utxoinfo.Output.Value
if resValue >= amount {
break
}
}
return needUtxos, resValue
}
|