以太坊手机轻钱包开发javascript签名合约交易

冷不防 2022-05-22 03:13 156阅读 0赞

以太坊合约交易签名web3.js

环境:window

工具或客户端:[ganache 1.2.1 ][ganache 1.2.1],

browser-solidity(

在线地址①:

https://ethereum.github.io/browser-solidity/\#optimize=false&version=soljson-v0.4.21+commit.dfe3193c.js

在线地址②：

[http://remix.ethereum.org/\#optimize=false&version=soljson-v0.4.24+commit.e67f0147.js][http_remix.ethereum.org_optimize_false_version_soljson-v0.4.24_commit.e67f0147.js]

)

开发语言:javacript

依赖的javacript文件:

web3.min.js;

ethereumjs-tx.js;

bignumber.js

(下载地址链接:

https://pan.baidu.com/s/1KRbH7G0yw5gnXl6iu3k83w   密码: jjqb    )

下载后把这三个文件放在同一目录,并新建一个html页面含基础标签元素并引入以上三 个文件

例:

<html>

<head>

<title>hello</title>

</head>

</html>

写在前面

预读此文档你将学习到以下内容

1.使用web3js与现有合约交互

2.使用在线solidity编译器创建编译合约

3. 使用web3js和ethereumjs-tx发布一个新的智能合约

4. 以太坊手机客户端轻钱包在安卓,ios中实现

5. 使用web3js实现合约交易签名

6. 发送合约交易前如何获取最佳gaslimit(要点)及算法实现

7. 发送合约交易前如何获取最佳gasprice

8. 发送合约交易前如何获取nonce

9.判断广播交易之后的状态和是否成功

10.网页钱包开发在html中实现

参考文档:

Web3.js中文文档(常用api):

[http://web3.tryblockchain.org/ethereum-web3.js-%E5%85%A5%E9%97%A8%E8%AF%B4%E6%98%8E.html][http_web3.tryblockchain.org_ethereum-web3.js-_E5_85_A5_E9_97_A8_E8_AF_B4_E6_98_8E.html]

Web3.js英文文档(比中文文档更全):

[http://web3js.readthedocs.io/en/1.0/index.html][http_web3js.readthedocs.io_en_1.0_index.html]

案例:

1)实例化web3

var web3 = new Web3();

// 连接到以太坊节点

web3.setProvider(new Web3.providers.HttpProvider("http://localhost:7545"));

2) ABI

//ABI可以从[browser-solidity][]直接获取复制粘贴(ABI)

![70][]

var ABI = \[ \{ "constant": false, "inputs": \[ \{ "name": "receiver", "type": "address" \}, \{ "name": "amount", "type": "uint256" \} \], "name": "sendCoin", "outputs": \[ \{ "name": "sufficient", "type": "bool" \} \], "payable": false, "stateMutability": "nonpayable", "type": "function" \}, \{ "constant": false, "inputs": \[ \{ "name": "addr", "type": "address" \} \], "name": "getBalance", "outputs": \[ \{ "name": "", "type": "uint256" \} \], "payable": false, "stateMutability": "nonpayable", "type": "function" \}, \{ "inputs": \[\], "payable": false, "stateMutability": "nonpayable", "type": "constructor" \}, \{ "anonymous": false, "inputs": \[ \{ "indexed": true, "name": "\_from", "type": "address" \}, \{ "indexed": true, "name": "\_to", "type": "address" \}, \{ "indexed": false, "name": "\_value", "type": "uint256" \} \], "name": "Transfer", "type": "event" \} \]

var MyContract = web3.eth.contract(ABI).at("contract address"); //获得已部署合约对象

//创建发布合约

3) WEB3DEPLOY直接从[browser-solidity][]直接获取复制粘贴(WEB3DEPLOY)即下面蓝色字体部分

![70 1][]

var metacoinContract = web3.eth.contract(  
\[\{"constant":false,"inputs":\[\{"name":"receiver","type":"address"\},\{"name":"amount","type":"uint256"\}\],"name":"sendCoin","outputs":\[\{"name":"sufficient","type":"bool"\}\],"payable":false,"stateMutability":"nonpayable","type":"function"\},\{"constant":false,"inputs":\[\{"name":"addr","type":"address"\}\],"name":"getBalance","outputs":\[\{"name":"","type":"uint256"\}\],"payable":false,"stateMutability":"nonpayable","type":"function"\},\{"inputs":\[\],"payable":false,"stateMutability":"nonpayable","type":"constructor"\},\{"anonymous":false,"inputs":\[\{"indexed":true,"name":"\_from","type":"address"\},\{"indexed":true,"name":"\_to","type":"address"\},\{"indexed":false,"name":"\_value","type":"uint256"\}\],"name":"Transfer","type":"event"\}\]);

var metacoin = metacoinContract.new(

from: web3.eth.accounts\[1\],   //自定义(创建合约的地址)

data: '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',

gas: '4700000'

\}, function (e, contract)\{

console.log(e, contract);

if (typeof contract.address !== 'undefined') \{

console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);

\})

//查询合约地址余额

var balance\_account\_one = metacoin.getBalance.call(web3.eth.accounts\[1\]);

balance\_account\_one.toString(10);

< "10000"

//获取bufferl类型私钥

var privatekey=New EthJS.Buffer.Buffer.from(  
'f0a6e4f7f3a51033d50057c0debc5d2f1306e97bf0ae6c8723bd1f15a46e0a54','hex');

//获取调用智能的data

//方法abi+参数(参数1,接收地址;参数2 发送代币金额)也可以自己拼接data

var data = metacoin.sendCoin.getData("0xE7E0afc3D0A1876e1DdA5FD001D127d5dC8FAb29",500);

Console.log(data);

//"0x90b98a11000000000000000000000000e7e0afc3d0a1876e1dda5fd001d127d5dc8fab2900000000000000000000000000000000000000000000000000000000000001f4"

//获取gasprice

var gasPrice = web3.eth.gasPrice;

console.log(gasPrice.toString(10));   //20000000000

var gasPrice\_hex =  web3.toHex(20000000000)

//签名交易

var nonce = web3.eth.getTransactionCount(web3.eth.accounts\[1\]);

Consle.log(nonce);  //1

var nonce\_hex =  web3.toHex(0)

var rawTx\_example = \{

nonce: 0x01, //nonce\_hex

gasPrice: '0x4a817c800',   //gasPrice\_hex

to: '0x90A679A0a247b9218c88d473B2Ce556460993ec3', //tokenaddress:调用合约时使用合约地址;非合约交易时接收地址

value: '0x00',

data:'0x90b98a11000000000000000000000000e7e0afc3d0a1876e1dda5fd001d127d5dc8fab2900000000000000000000000000000000000000000000000000000000000001f4'  //data

var gaslimit  =  web3.eth.estimateGas(rawTx\_example)

Console.log(gaslimit )   //36002

<36002

var gaslimit\_hex = web3.toHex(36002);

Console.log(gaslimit\_hex)   //0x8ca2

<"0x8ca2"

var rawTx = \{

nonce: 0x01,   //nonce\_hex

gasPrice: '0x4a817c800',   //gasPrice\_hex

Gaslimit:’0x8ca2’ , // gaslimit\_hex

to: '0x90A679A0a247b9218c88d473B2Ce556460993ec3', //tokenaddress:调用合约时使用合约地址;非合约交易时接收地址

value: '0x00',

data:'0x90b98a11000000000000000000000000e7e0afc3d0a1876e1dda5fd001d127d5dc8fab2900000000000000000000000000000000000000000000000000000000000001f4'  //data

var tx =new EthJS.Tx(rawTx);

tx.sign(privateKey);

var serializedTx = tx1.serialize();

web3.eth.sendRawTransaction(‘0x’+serializedTx , function(err, hash) \{

console.log(err)

console.log(hash); //"0x39225d367c12f9eab59b6ff95cfe8e90e3c24142647ef73fa63e268e24d63506"

\});

var balance\_account\_one= metacoin.getBalance.call(web3.eth.accounts\[1\]);

balance\_account\_one.toString(10);

<"9500"

拿到交易回执：  
web3.eth.getTransactionReceipt("0x39225d367c12f9eab59b6ff95cfe8e90e3c24142647ef73fa63e268e24d63506");

![70 2][]

根据返回的结果status判断,如果是0X1就代表交易被确认打包.转账成功是否成功以交易记录为准

成功!

[ganache 1.2.1]: https://github.com/trufflesuite/ganache/releases/tag/v1.2.1
[http_remix.ethereum.org_optimize_false_version_soljson-v0.4.24_commit.e67f0147.js]: http://remix.ethereum.org/#optimize=false&version=soljson-v0.4.24+commit.e67f0147.js
[http_web3.tryblockchain.org_ethereum-web3.js-_E5_85_A5_E9_97_A8_E8_AF_B4_E6_98_8E.html]: http://web3.tryblockchain.org/ethereum-web3.js-%E5%85%A5%E9%97%A8%E8%AF%B4%E6%98%8E.html
[http_web3js.readthedocs.io_en_1.0_index.html]: http://web3js.readthedocs.io/en/1.0/index.html
[browser-solidity]: https://ethereum.github.io/browser-solidity/#optimize=false&version=soljson-v0.4.21+commit.dfe3193c.js
[70]: /images/20220522/08d86850f1e9467191566fb187514e67.png
[70 1]: /images/20220522/8c1f7ead15bc4cc2904f628da1c8c9af.png
[70 2]: /images/20220522/1c13dc46280e44e5b48cec863fa0e4de.png