blockchain 맛 보기

//block.js

const { Console } = require('console')
const fs = require('fs')
const merkle = require('merkle')

class Block{
        constructor(header, body){
                this.header = header
                this.body = body
        }
}

class BlockHeader {
        constructor (version, previousHash, timestamp, merkleRoot, bit, nonce){
                this.version = version
                this.previousHash = previousHash
                this.timestamp = timestamp
                this.merkleRoot = merkleRoot
                this.bit = bit
                this.nonce = nonce
        }
}

function getVersion() {
        const package = fs.readFileSync("package.json")
        console.log(JSON.parse(package).version)
        return JSON.parse(package).version
}

//getVersion()

function createGenesisBlock() {
        const version = getVersion()
        const previousHash = '0'.repeat(64)
        const timestamp = parseInt(Date.now()/1000)
        const body = ['hello block']
        const tree = merkle('sha256').sync(body)
        const merkleRoot = tree.root() || '0'.repeat(64)
        const bit = 0
        const nonce = 0

        const header = new BlockHeader(version, previousHash, timestamp,merkleRoot, bit, nonce)
        return new Block(header, body)
}

const block = createGenesisBlock()
console.log(block)

 

//chainedBlock.js

const cryptojs = require('crypto-js')
const fs = require('fs')
const merkle = requie('merkle')

class Block {
        constructor(header, body) {
                this.header= header
                this.body = body
        }
}

class BlockHeader {
        constructor(version, index, previousHash, timestamp, merkleRoot, bit, nonce) {
                this.version = version
                this.index = index
                this.previousHash = previousHash
                this.timestamp = timestamp
                this.merkleRoot = merkleRoot
                this.bit = bit
                this.nonce = nonce
        }
}

function getVersion() {
        const package = fs.readFileSync("package.json")
        return JSON.parse(package).version
}

//getVersion()

function createGenesisBlock() {
        const version = getVersion()
        const index = 0
        const previousBlockHash = '0'.repeat(64)
        const timestamp = parseInt(Date.now()/1000)
        const body = ['hello block']
        const tree = merkle('sha256').sync(body)
        const merkleRoot = tree.root() || '0'.repeat(64)
        const bit = 0
        const nonce = 0

        const header = new BlockHeader(version, index, previousHash, timestamp, merkleRoot, bit, nonce)
        return new Block(header, body)
}

let Blocks = [createGenesisBlock()]

function getBlocks() {
        return Blocks
}

function getLastBlock() {
        return Blocks[Blocks.length -1]
}

function createHash(data) {
        const {version, index,previousHash, timestamp, merkleRoot, bit, nonce} = data.header
        const blockString = version + index + previousHash + timestamp + merkleRoot + bit + nonce
        const hash = cryptojs.SHA256(blockString).toString()
        return hash
}

function nextBlock(bodyData) {
        const prevBlock = getLastBlock()
        const version = getVersion()
        const index = prevBlock.header.indx +1
        const timestamp = parseInt(Date.now()/1000)
        const tree = merkle("sha256").sync(bodyData)
        const merkleRoot = tree.root() || '0'.repeat()
        const bit = 0
        const nonce = 0

        const header = new BlockHeader(version, index, previousBlockHash, merkleRoot, timestamp, bit, nonce)
        return new Block(header, bodyData)
}

function addBlock(bodyData) {
        const newBlock = nextBlock(bodyData)
        Blocks.push(newBlocks)
}

const genesisBlock = createGenesisBlock()
console.log(genesisBlock)

const block1 = nextBlock(["transaction"])

addBlock(['transaction2'])
addBlock(['transaction3'])
addBlock(['transaction4'])
addBlock(['transaction5'])
console.log(Blocks)

 

학원에서 배우는대로 적으면서 콘솔도 찍어보고 있는데 하나도 이해 안간다.. 돌겠다