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package main
import (
"github.com/boltdb/bolt"
"log"
"fmt"
)
const dbFile = "blockchain.db"
const blockBucket = "blocks"
type Blockchain struct{
tip []byte
db * bolt.DB
}
type BlockChainIterateor struct{
currenthash []byte
db * bolt.DB
}
func (bc * Blockchain) AddBlock(){
var lasthash []byte
err := bc.db.View(func(tx * bolt.Tx) error{
b:= tx.Bucket([]byte(blockBucket))
lasthash = b.Get([]byte("l"))
return nil
})
if err!=nil{
log.Panic(err)
}
newBlock := NewBlock(lasthash)
bc.db.Update(func(tx *bolt.Tx) error {
b:=tx.Bucket([]byte(blockBucket))
err:= b.Put(newBlock.Hash,newBlock.Serialize())
if err!=nil{
log.Panic(err)
}
err = b.Put([]byte("l"),newBlock.Hash)
if err!=nil{
log.Panic(err)
}
bc.tip = newBlock.Hash
return nil
})
}
func NewBlockchain() * Blockchain{
var tip []byte
db,err := bolt.Open(dbFile,0600,nil)
if err!=nil{
log.Panic(err)
}
err = db.Update(func(tx * bolt.Tx) error{
b:= tx.Bucket([]byte(blockBucket))
if b==nil{
fmt.Println("区块链不存在，创建一个新的区块链")
genesis := NewGensisBlock()
b,err:=tx.CreateBucket([]byte(blockBucket))
if err!=nil{
log.Panic(err)
}
err = b.Put(genesis.Hash,genesis.Serialize())
if err!=nil{
log.Panic(err)
}
err = b.Put([]byte("l"),genesis.Hash)
tip = genesis.Hash
}else{
tip = b.Get([]byte("l"))
}
return nil
})
if err!=nil{
log.Panic(err)
}
bc:=Blockchain{tip,db}
return &bc
}
func (bc * Blockchain) iterator() * BlockChainIterateor{
bci := &BlockChainIterateor{bc.tip,bc.db}
return bci
}
func (i * BlockChainIterateor) Next() * Block{
var block *Block
err:= i.db.View(func(tx *bolt.Tx) error {
b:=tx.Bucket([]byte(blockBucket))
deblock := b.Get(i.currenthash)
block = DeserializeBlock(deblock)
return nil
})
if err!=nil{
log.Panic(err)
}
i.currenthash = block.PrevBlockHash
return block
}
func (bc * Blockchain) printBlockchain(){
bci:=bc.iterator()
for{
block:= bci.Next()
block.String()
fmt.Println()
if len(block.PrevBlockHash)==0{
break
}
}
}
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