转账脚本
- 编写转账的js脚本，保存在transactionTest.js文件中
var Web3 = require('web3');var web3 = new Web3(new Web3.providers.HttpProvider("http://192.168.1.114:8989"));var _from = web3.eth.accounts[0];var _to = web3.eth.accounts[1];var _value = 2333;web3.eth.sendTransaction({from:_from,to:_to,value:_value},(err,res)=>{ if(err){ console.log("Error:",err); }else{ console.log("Result:",res); }}); - 在shell中敲如下命令
$ node transactionTest.js Result: 0xbae4d738ca3501d686781c10ce859b0b3eafefbeb21bf7344508017308a16587
转币合约的调用
- 编写solidity程序
pragma solidity ^0.4.26;contract Coin{ address public minter; mapping(address=>uint) public balance; event Sent(address from,address to,uint account); constructor() public{ minter = msg.sender; } function mint(address receiver,uint account) public{ require(msg.sender == minter); balance[receiver] += account; } function send(address receiver,uint account) public{ require(balance[msg.sender] >= account); balance[msg.sender] -= account; balance[receiver] += account; emit Sent(msg.sender,receiver,account); }} - 使用remix部署合约到本地私链
//部署的合约地址0x80f1A59742EF01a913Fe4B43ebaA759B9618B323//开账minter0x613d104e6D80ce5A06e7987D39Bbd4eE0ccD7656//区块号26//abi[{"constant":true,"inputs":[],"name":"minter","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"receiver","type":"address"},{"name":"account","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"receiver","type":"address"},{"name":"account","type":"uint256"}],"name":"send","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"from","type":"address"},{"indexed":false,"name":"to","type":"address"},{"indexed":false,"name":"account","type":"uint256"}],"name":"Sent","type":"event"}]//操作前需要在geth中指定，使msg.sender保证为该用户发起 【可选】> eth.defaultAccount = eth.coinbase // 之后就不用输入{from:..} - 编写调用的js脚本，保存在sendCoin.js文件中
var Web3 = require('web3');var web3 = new Web3(new Web3.providers.HttpProvider("http://192.168.1.114:8989"));var _from = web3.eth.accounts[0];var _to = web3.eth.accounts[1];var amount = 12;var abi = [{"constant":true,"inputs":[],"name":"minter","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"receiver","type":"address"},{"name":"account","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"receiver","type":"address"},{"name":"account","type":"uint256"}],"name":"send","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"from","type":"address"},{"indexed":false,"name":"to","type":"address"},{"indexed":false,"name":"account","type":"uint256"}],"name":"Sent","type":"event"}]var CoinContract = web3.eth.contract(abi);var contractAddr = "0x80f1A59742EF01a913Fe4B43ebaA759B9618B323";var contractInstance = CoinContract.at(contractAddr);contractInstance.send(_to,amount,{from:_from},(err,res)=>{ if(err) console.log("Error:",err); else console.log("Result",res);}); - 执行shell命令，并检验
$ node sendCoin.jsResult 0x1ea44d44b45a25ed18ee1190d52175f66b832403fb121518d67ea56c4dd24025
// 之前的余额信息> contractInstance.balance(eth.accounts[1])25> INFO [05-29|21:07:45.047] Submitted transaction fullhash=0x1ea44d44b45a25ed18ee1190d52175f66b832403fb121518d67ea56c4dd24025 recipient=0x80f1A59742EF01a913Fe4B43ebaA759B9618B323INFO [05-29|21:07:45.047] Commit new mining work number=38 sealhash=12385d…3f2d34 uncles=0 txs=0 gas=0 fees=0 elapsed=41.826µsINFO [05-29|21:07:45.048] Sealing paused, waiting for transactions INFO [05-29|21:07:45.048] Commit new mining work number=38 sealhash=58cda4…ccb9dc uncles=0 txs=1 gas=35756 fees=3.5756e-14 elapsed=497.6µsINFO [05-29|21:07:45.048] Successfully sealed new block number=38 sealhash=58cda4…ccb9dc hash=9922c2…b07bb9 elapsed=543.138µsINFO [05-29|21:07:45.048] 🔨 mined potential block number=38 hash=9922c2…b07bb9INFO [05-29|21:07:45.048] Commit new mining work number=39 sealhash=769859…b5c2b0 uncles=0 txs=0 gas=0 fees=0 elapsed=211.956µsINFO [05-29|21:07:45.048] Sealing paused, waiting for transactions INFO [05-29|21:07:45.049] Commit new mining work number=39 sealhash=769859…b5c2b0 uncles=0 txs=0 gas=0 fees=0 elapsed=390.635µs// 之后的余额信息，可以发现增加了12> contractInstance.balance(eth.accounts[1])37
(补充)优化上述脚本
- 实现转币地址和金额可以在命令行指定
- 实现在脚本中解锁账户(启动geth时候必须指定暴露personal的api接口 --rpcapi personal)
将下列代码写入 sendCoinPlus.js文件中
var Web3 = require('web3');var web3 = new Web3(new Web3.providers.HttpProvider("http://192.168.1.114:8989"));//从命令行的第三个参数开始切割，忽略前面的 node sendCoinPlus.js 两个参数var arguments = process.argv.splice(2);var _from = arguments[0]var _to = arguments[1];var amount = arguments[2];var abi = [{"constant":true,"inputs":[],"name":"minter","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"receiver","type":"address"},{"name":"account","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"receiver","type":"address"},{"name":"account","type":"uint256"}],"name":"send","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"from","type":"address"},{"indexed":false,"name":"to","type":"address"},{"indexed":false,"name":"account","type":"uint256"}],"name":"Sent","type":"event"}]var CoinContract = web3.eth.contract(abi);var contractAddr = "0x80f1A59742EF01a913Fe4B43ebaA759B9618B323";var contractInstance = CoinContract.at(contractAddr);//解锁账户web3.personal.unlockAccount(_from,"199748",(err,res)=>{ if(err){ console.log("Error:",err); }else{ contractInstance.send(_to,amount,{from:_from},(err,res)=>{ if(err) console.log("Error:",err); else console.log("Result",res); }); }}); $ node sendCoinPlus.js "0x9f0316428ea5231b7116840df16ae0a768078ffd" "0x613d104e6d80ce5a06e7987d39bbd4ee0ccd7656" 10
事件监听
- 实现监听事件的js脚本，保存到 listenContract.js文件中
var Web3 = require('web3');var web3 = new Web3(new Web3.providers.HttpProvider("http://192.168.1.114:8989"));var abi = [{"constant":true,"inputs":[],"name":"minter","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"receiver","type":"address"},{"name":"account","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"receiver","type":"address"},{"name":"account","type":"uint256"}],"name":"send","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"from","type":"address"},{"indexed":false,"name":"to","type":"address"},{"indexed":false,"name":"account","type":"uint256"}],"name":"Sent","type":"event"}]var CoinContract = web3.eth.contract(abi);var contractAddr = "0x80f1A59742EF01a913Fe4B43ebaA759B9618B323";var contractInstance = CoinContract.at(contractAddr);// 监听事件contractInstance.Sent("latest",(err,res)=>{ if(err) console.log("Error:",err); else console.log("Sent Event:",res);}); - 启动监听，并发起一笔监听所在合约的调用
# 启动监听$ node listenContract.js
//发起调用> contractInstance.send(eth.accounts[2],10,{from:eth.accounts[0]})INFO [05-29|22:25:46.702] Submitted transaction fullhash=0x55667599e6a3da27e823508d940e50a374168fa3093e0b20c0af94bc9b4908ed recipient=0x80f1A59742EF01a913Fe4B43ebaA759B9618B323"0x55667599e6a3da27e823508d940e50a374168fa3093e0b20c0af94bc9b4908ed"> INFO [05-29|22:25:46.716] Commit new mining work number=41 sealhash=b8e382…21e5a3 uncles=0 txs=0 gas=0 fees=0 elapsed=88.875µsINFO [05-29|22:25:46.716] Sealing paused, waiting for transactions INFO [05-29|22:25:46.716] Commit new mining work number=41 sealhash=f31b2e…7f7d92 uncles=0 txs=1 gas=50756 fees=5.0756e-14 elapsed=852.866µsINFO [05-29|22:25:46.722] Successfully sealed new block number=41 sealhash=f31b2e…7f7d92 hash=c5d63e…232a9f elapsed=5.665msINFO [05-29|22:25:46.722] 🔨 mined potential block number=41 hash=c5d63e…232a9fINFO [05-29|22:25:46.722] Commit new mining work number=42 sealhash=3ac604…6a129c uncles=0 txs=0 gas=0 fees=0 elapsed=315.093µsINFO [05-29|22:25:46.723] Sealing paused, waiting for transactions INFO [05-29|22:25:46.723] Commit new mining work number=42 sealhash=3ac604…6a129c uncles=0 txs=0 gas=0 fees=0 elapsed=616.163µs $ node listenContract.js//可以发现，成功监听到事件Sent Event: { address: '0x80f1a59742ef01a913fe4b43ebaa759b9618b323', blockNumber: 41, transactionHash: '0x55667599e6a3da27e823508d940e50a374168fa3093e0b20c0af94bc9b4908ed', transactionIndex: 0, blockHash: '0xc5d63ece5d0da1a6f3324d4949b4911d2b591217c996563d53857dbb33232a9f', logIndex: 0, removed: false, event: 'Sent', args: { from: '0x613d104e6d80ce5a06e7987d39bbd4ee0ccd7656', to: '0xf0a545c9bd6dbb358990b9bded9086d4bcbccbc3', account: BigNumber { s: 1, e: 1, c: [Array] } }} 