九星創(chuàng)客系統(tǒng)開發(fā)（開發(fā)詳細(xì)）丨創(chuàng)客互助公排系統(tǒng)開發(fā)（開發(fā)邏輯）
智能合約是運(yùn)行在區(qū)塊鏈公鏈上的一種代碼，該代碼由Solidity編寫，并通過區(qū)塊鏈的智能合約虛擬機(jī)來執(zhí)行，以達(dá)到對區(qū)塊鏈編程的目標(biāo)?？梢詫^(qū)塊鏈公聯(lián)理解為操作系統(tǒng)，Solidity是編寫該操作系統(tǒng)應(yīng)用程序的編程語言，智能合約虛擬機(jī)則是編程語言編譯之后的代碼運(yùn)行環(huán)境。
var fs=require('fs');
const fetch=require('node-fetch')
var Web3=require('web3');
const ethers=require('ethers');
const infuraKey=fs.readFileSync("../.infuraKey").toString().trim();
var ethRpcUrl=`https://rinkeby.infura.io/v3/`+infuraKey
var web3=new Web3(ethRpcUrl);
abi=[開發(fā)源碼及部署I35詳細(xì)7O98開發(fā)O7I8
{
"inputs":[],
"name":"getValue",
"outputs":[
{
"internalType":"uint256",
"name":"",
"type":"uint256"
}
],
"stateMutability":"view",
"type":"function"
},
{
"inputs":[功能及案例：MrsFu123
{
"internalType":"uint256",
"name":"_value",
"type":"uint256"
}
],
"name":"setValue",
"outputs":[],
"stateMutability":"nonpayable",
"type":"function"
}
]
contractAddress="合約地址"
pk="錢包私鑰"
userAccount="私鑰對應(yīng)的賬戶地址"
main()
.then(()=>process.exit(0))
.catch(error=>{
console.error(error);
process.exit(1);
});
async function main(){
await setValue();
await getValue();
}
async function getNonce(account){
let nonce=await web3.eth.getTransactionCount(account);
console.log('nonce=',nonce)
return nonce;
}
async function getValue(){
//對方法進(jìn)行sha3編碼，然后取前四個(gè)字節(jié)
//var methodSign=await web3.utils.keccak256("getValue()").substr(0,10);
var methodSign=await web3.utils.keccak256("getValue()").substr(0,10);
//console.log(methodSign)
data=methodSign;
//如果有入?yún)?，對入?yún)⑦M(jìn)行編碼
//encodeParams=web3.eth.abi.encodeParameters(['uint256'],[456]);
//拼接方法名和入?yún)⒆鳛閖sonrpc的params中的data字段的數(shù)據(jù)
//data+=encodeParams.substr(2,encodeParams.length)
console.log(data)
//構(gòu)造post請求的body參數(shù)
var input={"jsonrpc":"2.0","id":3,"method":"eth_call","params":[{"to":contractAddress,"data":data},"latest"]}
//http可以一次多個(gè)請求
var inputs=[input,input]
//發(fā)送post請求
const resp=await fetch(ethRpcUrl,{
method:"POST",
body:JSON.stringify(inputs),
headers:{
"Content-Type":"application/json"
}
});
var rpcResult=await resp.json();
console.log(rpcResult[0].result)
//用ethers包中的方法解析返回結(jié)果
var ethersResult=await ethers.utils.defaultAbiCoder.decode(['uint256'],rpcResult[0].result)
//用web3包中的方法解析防護(hù)結(jié)果
var decodeResult=await web3.eth.abi.decodeParameters(['uint256'],rpcResult[0].result);
console.log("vaule is"+ethersResult)
console.log("value is"+decodeResult[0])
}
async function setValue(){
//這里借用web3的方法對要發(fā)送的內(nèi)容進(jìn)行簽名
var contract=new web3.eth.Contract(abi,contractAddress);
value=456;
var encodeABI=contract.methods.setValue(value).encodeABI();
var signResult=await web3.eth.accounts.signTransaction({
gas:3000000,
to:contractAddress,
data:encodeABI,
nonce:await getNonce(userAccount)
},pk);
console.log(signResult);
rawTransaction=signResult.rawTransaction
//構(gòu)造post請求的body參數(shù)
var input={"jsonrpc":"2.0","id":3,"method":"eth_sendRawTransaction","params":[rawTransaction]}
console.log(input)
var inputs=[input]
//發(fā)送post請求
const resp=await fetch(ethRpcUrl,{
method:"POST",
body:JSON.stringify(inputs),
headers:{
"Content-Type":"application/json"
}
});
var rpcResult=await resp.json();
console.log(rpcResult)
}
