以太坊私链搭建
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以太坊私链搭建
系统环境
Ubuntu16.04
安装以太坊客户端
PPA 直接安装
安装依赖:
apt install software-properties-common
添加以太坊源:
add-apt-repository -y ppa:ethereum/ethereum apt update
安装 go-ethereum:
apt install ethereum
geth version
查看是否安装成功。源码安装
配置 Go 语言环境
wget https://storage.googleapis.com/golang/go1.9.linux-amd64.tar.gz tar -C /usr/local -xzf go1.9.linux-amd64.tar.gz
编辑
/etc/profile
或$HOME/.profile,
追加环境变量:export PATH=$PATH:/usr/local/go/bin
编辑 $HOME/profile 或 $HOME/.bashrc,追加go 工作目录环境变量:
export GOPATH=$HOME/gopath
下载和编译 Geth
安装 C 编译器:
apt install -y build-essential
下载最新源码:
git clone https://github.com/ethereum/go-ethereum
编译安装:
cd go-ethereum make geth
geth version 查看是否安装成功。按照上述,追加变量
Solidity 编译器安装
PPA 直接安装
add-apt-repository ppa:ethereum/ethereum apt update apt install solc
官方推荐浏览器的IDE:
Remix
https://remix.ethereum.org```私有链搭建
配置初始状态
定义区块,区块信息写在JSON的配置文件里。比如;
{ "config": { "chainID": 1024, "homesteadBlock": 0, "eip155Block": 0, "eip158Block": 0 }, "alloc": {}, "coinbase": "0x0000000000000000000000000000000000000000", "difficulty": "0x400", "extraData": "0x0", "gasLimit": "0x2fefd8", "nonce": "0xdeadbeefdeadbeef", "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000", "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000", "timestamp": "0x00" }
Geth 1.6+以太坊提供一个区块的向导工具:puppeth。并提供更适合在私有链使用的CliquePoA共识算法
初始化:写入区块
初始化区块,将上面的区块信息写入到链中。新建目录存放区块链数据,
目录结构应该为:privatechain ├── data0 └── genesis.json
cd到privatechain 中,执行初始化命令:
cd privatechain geth --datadir data0 init genesis.json
geth init,表示初始化区块链,命令可以带有选项和参数
以上操作将会读取 genesis.json 文件,根据其内容,将区块写到区块链中。如果输出一下内容,说明初始化成功
WARN [01-29|11:01:09] No etherbase set and no accounts found as default INFO [01-29|11:01:09] Allocated cache and file handles database=/root/work/privatechain/data0/geth/chaindata cache=16 handles=16 INFO [01-29|11:01:09] Writing custom genesis block INFO [01-29|11:01:09] Successfully wrote genesis state database=chaindata hash=84e71d…97246e INFO [01-29|11:01:09] Allocated cache and file handles database=/root/work/privatechain/data0/geth/lightchaindata cache=16 handles=16 INFO [01-29|11:01:09] Writing custom genesis block INFO [01-29|11:01:09] Successfully wrote genesis state database=lightchaindata hash=84e71d…97246e
初始化成功后,会在数据目录 data0 中生成 geth 和 keystore 两个文件夹,
此时目录结构应该为:privatechain ├── data0 │ ├── geth │ │ ├── chaindata │ │ │ ├── 000001.log │ │ │ ├── CURRENT │ │ │ ├── LOCK │ │ │ ├── LOG │ │ │ └── MANIFEST-000000 │ │ └── lightchaindata │ │ ├── 000001.log │ │ ├── CURRENT │ │ ├── LOCK │ │ ├── LOG │ │ └── MANIFEST-000000 │ └── keystore └── genesis.json
其中
geth/chaindata
中存放的是区块数据,keystore 中存放的是账户数据。启动私有链节点
初始化完成后,就有了一条自己的私有链,之后就可以启动自己的私有链节点并做一些操作
启动节点并进入交互式控制台geth --identity "TestNode" --rpc --rpcport "8545" --datadir data0 --port "30303" --nodiscover console
参数说明如下:
–identity:指定节点 ID; –rpc:表示开启 HTTP-RPC 服务; –rpcport:指定 HTTP-RPC 服务监听端口号(默认为 8545); –datadir:指定区块链数据的存储位置; –port:指定和其他节点连接所用的端口号(默认为 30303); –nodiscover:关闭节点发现机制,防止加入有同样初始配置的陌生节点。
运行上面的命令后,就启动了区块链节点并进入了该节点的控制台:
... Welcome to the Geth JavaScript console! instance: Geth/TestNode/v1.6.7-stable-ab5646c5/linux-amd64/go1.8.1 modules: admin:1.0 debug:1.0 eth:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 web3:1.0
这个是一个交互式 JavaScript环境,能执行 JavaScript 代码,在这个环境里也内置一些用来操作以太坊的 JavaScript 对象,
比如:eth:包含一些跟操作区块链相关的方法; net:包含一些查看p2p网络状态的方法; admin:包含一些与管理节点相关的方法; miner:包含启动&停止挖矿的一些方法; personal:主要包含一些管理账户的方法; txpool:包含一些查看交易内存池的方法; web3:包含了以上对象,还包含一些单位换算的方法。
控制台操作
常用命令有:
personal.newAccount():创建账户; personal.unlockAccount():解锁账户; eth.accounts:枚举系统中的账户; eth.getBalance():查看账户余额,返回值的单位是 Wei(Wei 是以太坊中最小货币面额单位,类似比特币中的聪,1 ether = 10^18 Wei); eth.blockNumber:列出区块总数; eth.getTransaction():获取交易; eth.getBlock():获取区块; miner.start():开始挖矿; miner.stop():停止挖矿; web3.fromWei():Wei 换算成以太币; web3.toWei():以太币换算成 Wei; txpool.status:交易池中的状态; admin.addPeer():连接到其他节点;
这些命令都能 Tab 键自动补全,所以没必要全部记住
例如:一、创建账户 > personal.newAccount() Passphrase: Repeat passphrase: "0x3443ffb2a5ce3f4b80080791e0fde16a3fac2802" > INFO [01-29|11:07:44] New wallet appeared url=keystore:///root/work/privatech… status=Locked
输入两遍密码后,会生成账户地址。
再创建一个账户:
> personal.newAccount() Passphrase: Repeat passphrase: "0x02bee2a1582bbf58c42bbdfe7b8db4685d4d4c62" > INFO [01-29|11:08:15] New wallet appeared url=keystore:///root/work/privatech… status=Locked
查看刚刚创建的两个账户:
> eth.accounts ["0x3443ffb2a5ce3f4b80080791e0fde16a3fac2802", "0x02bee2a1582bbf58c42bbdfe7b8db4685d4d4c62"]
查看账户余额
> eth.getBalance(eth.accounts[0]) 0 > eth.getBalance(eth.accounts[1]) 0
启动&停止挖矿
启动挖矿:
> miner.start(1)
Tips:第一次启动挖矿会先生成挖矿所需的 DAG 文件,这个过程有点慢,等进度达到 100% 后,就会开始挖矿,此时屏幕会被挖矿信息刷屏。
停止挖矿,在 console 中输入:> miner.stop()
挖到一个区块会奖励5个以太币,挖矿所得的奖励会进入矿工的账户,这个账户叫做 coinbase,默认情况下 coinbase 是本地账户中的第一个账户,可以通过
miner.setEtherbase()
将其他账户设置成coinbase
。发送交易
目前,账户 0 已经挖到了 3 个块的奖励,账户 1 的余额还是0:
> eth.getBalance(eth.accounts[0]) 15000000000000000000 > eth.getBalance(eth.accounts[1]) 0
我们要从账户 0 向账户 1 转账,所以要先解锁账户 0,才能发起交易:
> personal.unlockAccount(eth.accounts[0]) Unlock account 0x3443ffb2a5ce3f4b80080791e0fde16a3fac2802 Passphrase: true
发送交易,账户 0 -> 账户 1:
> amount = web3.toWei(5,'ether') "5000000000000000000" > eth.sendTransaction({from:eth.accounts[0],to:eth.accounts[1],value:amount}) INFO [01-29|11:09:12] Submitted transaction fullhash=0x9f5e61f3d686f793e2df6378d1633d7a9d1df8ec8c597441e1355112d102a6ce recipient=0x02bee2a1582bbf58c42bbdfe7b8db4685d4d4c62 "0x9f5e61f3d686f793e2df6378d1633d7a9d1df8ec8c597441e1355112d102a6ce"
此时如果没有挖矿,用
txpool.status
命令可以看到本地交易池中有一个待确认的交易,可以使用eth.getBlock("pending", true).transactions
查看当前待确认交易。使用 miner.start() 命令开始挖矿:
> miner.start(1);admin.sleepBlocks(1);miner.stop();
新区块挖出后,挖矿结束,查看账户 1 的余额,已经收到了账户 0 的以太币:
> web3.fromWei(eth.getBalance(eth.accounts[1]),'ether') 5
查看交易和区块
查看当前区块总数:
> eth.blockNumber 4
通过交易 Hash 查看交易(Hash 值包含在上面交易返回值中):
> eth.getTransaction("0x9f5e61f3d686f793e2df6378d1633d7a9d1df8ec8c597441e1355112d102a6ce") { blockHash: "0xdc1fb4469bf4613821c303891a71ff0d1f5af9af8c10efdd8bcd8b518533ee7d", blockNumber: 4, from: "0x3443ffb2a5ce3f4b80080791e0fde16a3fac2802", gas: 90000, gasPrice: 18000000000, hash: "0x9f5e61f3d686f793e2df6378d1633d7a9d1df8ec8c597441e1355112d102a6ce", input: "0x", nonce: 0, r: "0x4214d2d8d92efc3aafb515d2413ecd45ab3695d9bcc30d9c7c06932de829e064", s: "0x42822033225a2ef662b9b448576e0271b9958e1f4ec912c259e01c84bd1f6681", to: "0x02bee2a1582bbf58c42bbdfe7b8db4685d4d4c62", transactionIndex: 0, v: "0x824", value: 5000000000000000000 }
通过区块号查看区块:
> eth.getBlock(4) { difficulty: 131072, extraData: "0xd783010607846765746887676f312e382e31856c696e7578", gasLimit: 3153874, gasUsed: 21000, hash: "0xdc1fb4469bf4613821c303891a71ff0d1f5af9af8c10efdd8bcd8b518533ee7d", logsBloom: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", miner: "0x3443ffb2a5ce3f4b80080791e0fde16a3fac2802", mixHash: "0x6df88079cf4fbfae98ad7588926fa30becddf4b8b55f93f0380d82ce0533338c", nonce: "0x39455ee908666993", number: 4, parentHash: "0x14fe27755d6fcc704f6b7018d5dc8193f702d89f2c7807bf6f0e402a2b0a29d9", receiptsRoot: "0xfcb5b5cc322998562d96339418d08ad8e7c5dd87935f9a3321e040344e3fd095", sha3Uncles: "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347", size: 651, stateRoot: "0xdd4a0ce76c7e0ff149853dce5bb4f99592fb1bc3c5e87eb07518a0235ffacd8c", timestamp: 1505202063, totalDifficulty: 525312, transactions: ["0x9f5e61f3d686f793e2df6378d1633d7a9d1df8ec8c597441e1355112d102a6ce"], transactionsRoot: "0xbb909845183e037b15d24fe9ad1805fd00350ae04841aa774be6af96e76fdbf9", uncles: [] }
连接到其他节点
可以通过 admin.addPeer() 方法连接到其他节点,两个节点要要指定相同的 chainID。
比如:> admin.nodeInfo.enode "enode://d465bcbd5c34da7f4b8e00cbf9dd18e7e2c38fbd6642b7435f340c7d5168947ff2b822146e1dc1b07e02f7c15d5ca09249a92f1d0caa34587c9b2743172259ee@[::]:30303"
> admin.addPeer("enode://d465bcbd5c34da7f4b8e00cbf9dd18e7e2c38fbd6642b7435f340c7d5168947ff2b822146e1dc1b07e02f7c15d5ca09249a92f1d0caa34587c9b2743172259ee@127.0.0.1:30304") addPeer()
通过 admin.peers 可以查看连接到的其他节点信息,通过 net.peerCount 可以查看已连接到的节点数量
智能合约操作
创建和编译智能合约
新建Solidity智能合约文件,重命名为
testContract.sol
将输入的两个数相乘后输出:pragma solidity ^0.4.0; contract TestContract { function multiply(uint a, uint b) returns (uint) { return a * b; } }
编译智能合约,编译后的 EVM 二进制码:
$ solc --bin testContract.sol ======= testContract.sol:TestContract ======= Binary: 6060604052341561000f57600080fd5b5b60b48061001e6000396000f30060606040526000357c0100000000000000000000000000000000000000000000000000000000900463ffffffff168063165c4a1614603d575b600080fd5b3415604757600080fd5b60646004808035906020019091908035906020019091905050607a565b6040518082815260200191505060405180910390f35b600081830290505b929150505600a165627a7a72305820b494a4b3879b3810accf64d4cc3e1be55f2f4a86f49590b8a9b8d7009090a5d30029
$ solc --abi testContract.sol ======= testContract.sol:TestContract ======= Contract JSON ABI [{"constant":false,"inputs":[{"name":"a","type":"uint256"},{"name":"b","type":"uint256"}],"name":"multiply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]
> code = "0x6060604052341561000f57600080fd5b5b60b48061001e6000396000f30060606040526000357c0100000000000000000000000000000000000000000000000000000000900463ffffffff168063165c4a1614603d575b600080fd5b3415604757600080fd5b60646004808035906020019091908035906020019091905050607a565b6040518082815260200191505060405180910390f35b600081830290505b929150505600a165627a7a72305820b494a4b3879b3810accf64d4cc3e1be55f2f4a86f49590b8a9b8d7009090a5d30029" > abi = [{"constant":false,"inputs":[{"name":"a","type":"uint256"},{"name":"b","type":"uint256"}],"name":"multiply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]
部署智能合约
使用账户 0 来部署合约,
解锁账户:> personal.unlockAccount(eth.accounts[0]) Unlock account 0x3443ffb2a5ce3f4b80080791e0fde16a3fac2802 Passphrase: true
发送部署合约交易:
> myContract = eth.contract(abi) ... > contract = myContract.new({from:eth.accounts[0],data:code,gas:1000000}) INFO [01-29|11:11:19] Submitted contract creation fullhash=0x0a7dfa9cac7ef836a72ed1d5bbfa65c0220347cde4efb067a0b03b15fb70bce1 contract=0x7cbe4019e993f9922b8233502d94890099ee59e6 { abi: [{ constant: false, inputs: [{...}, {...}], name: "multiply", outputs: [{...}], payable: false, stateMutability: "nonpayable", type: "function" }], address: undefined, transactionHash: "0x0a7dfa9cac7ef836a72ed1d5bbfa65c0220347cde4efb067a0b03b15fb70bce1" }
此时如果没有挖矿,txpool.status 可以看到本地交易池有一个待确交易。
查看当前待确认的交易:[{ blockHash: "0xfedd6fef9f25e96a5a20b5ffcd152e9fe05d193ae0989c25d6197d2441c2c09b", blockNumber: 5, from: "0x3443ffb2a5ce3f4b80080791e0fde16a3fac2802", gas: 1000000, gasPrice: 18000000000, hash: "0x0a7dfa9cac7ef836a72ed1d5bbfa65c0220347cde4efb067a0b03b15fb70bce1", input: "0x6060604052341561000f57600080fd5b5b60b48061001e6000396000f30060606040526000357c0100000000000000000000000000000000000000000000000000000000900463ffffffff168063165c4a1614603d575b600080fd5b3415604757600080fd5b60646004808035906020019091908035906020019091905050607a565b6040518082815260200191505060405180910390f35b600081830290505b929150505600a165627a7a72305820b494a4b3879b3810accf64d4cc3e1be55f2f4a86f49590b8a9b8d7009090a5d30029", nonce: 3, r: "0xfe7139a31694a36f946e7182c35c52a21bf31d33994490815f63f6674e84dc93", s: "0x4701a984ee93d2a323fac55547b31534b11915599de75202a1d62061241fefbf", to: null, transactionIndex: 0, v: "0x823", value: 0 }]
miner.start()
命令开始挖矿,一段时间后交易会被确认,随新区块进入区块链。调用智能合约
> contract.multiply(2, 4, {from:eth.accounts[0]}) INFO [01-29|11:15:14] Submitted transaction fullhash=0x29b47d580ba6ccb2445aa3ebdcb14567bd5cbc6004edef7a4064c36e0606bca2 recipient=0x7cbe4019e993f9922b8233502d94890099ee59e6 "0x29b47d580ba6ccb2445aa3ebdcb14567bd5cbc6004edef7a4064c36e0606bca2"
本地查看返回结果:
> contract.multiply(2,4) 8