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【科学家养成日记#2】转移代币
继上文【科学家养成日记#1】读取钱包代币数量, 这次的作业是转移钱包里面的代币
如果是转移链的原生代币，比如以太链的ETH，BSC链的BNB，构造的tx的data可为空。不是原生的代币就需要通过ERC20的合约构造一个data。所以转移ERC20代币的费用会比原生代币的高
const Web3 = require('web3');
const erc20Abi = require('./ABI/erc20.json');
const rpcUrl = 'https://data-seed-prebsc-1-s1.binance.org:8545';
const rpcWeb3 = new Web3(new Web3.providers.HttpProvider(rpcUrl));
let web3 = rpcWeb3;
/**
* 通过小数点多少位，转换对应的数据
* @param {*} tokenDecimals 小数点位数
* @returns 相对应的位数名
*/
function getWeiName(tokenDecimals = 18) {
tokenDecimals = Number(tokenDecimals);
let weiName = 'ether';
switch (tokenDecimals) {
case 3:
weiName = "Kwei";
break;
case 6:
weiName = 'mwei';
break;
case 9:
weiName = 'gwei';
break;
case 12:
weiName = 'microether ';
break;
case 15:
weiName = 'milliether';
break;
case 18:
weiName = 'ether';
break;
default:
weiName = 'ether';
break;
}
return weiName;
}
/**
* 获得钱包原生代币余额
* @param {*} address 钱包地址
* @returns 钱包原生代币数量
*/
const getBnbBalance = (address) => {
return new Promise(async (resolve, reject) => {
let result = await web3.eth.getBalance(address);
if (result) {
let balance = web3.utils.fromWei(result, getWeiName());
resolve(balance);
} else {
reject("Getting Bnb Balance error.");
}
})
}
/**
* 获得ERC20代币余额
* @param {*} tokenAddress 代币的合约
* @param {*} address 钱包地址
* @returns ERC20代币余额
*/
const getTokenBalance = (tokenAddress, address) => {
return new Promise(async (resolve, reject) => {
let tokenContract = new web3.eth.Contract(erc20Abi, tokenAddress);
let result = await tokenContract.methods.balanceOf(address).call();
let decimals = await tokenContract.methods.decimals().call();
let weiName = getWeiName(decimals);
let tokenBalance = web3.utils.fromWei(result, weiName);
let symbol = await tokenContract.methods.symbol().call();
resolve(`${tokenBalance} ${symbol}`);
})
}
/**
* 转移代币
* @param {*} from 来源钱包
* @param {*} to 目标钱包
* @param {*} amount 数量
* @param {*} input 构造的数据
*/
const transfer = async (from, to, amount, input) => {
let gasPrice = await web3.eth.getGasPrice();
let gasLimit = 420000;
let nounce = await web3.eth.getTransactionCount(from);
let nbnb = web3.utils.toWei((amount).toString(10), 'ether');
let tx = {
nounce,
gasPrice,
gasLimit,
to,
value: nbnb,
data: input
}
web3.eth.accounts.signTransaction(tx, process.env.PRIVATE_KEY).then(signed => {
web3.eth.sendSignedTransaction(signed.rawTransaction).on('receipt', console.log)
})
}
/**
* 转移ERC20代币
*/
async function transferErc20() {
let account = web3.eth.accounts.privateKeyToAccount(process.env.PRIVATE_KEY);
let from = account.address;
let toWallet = "0xF5FD98884ba506B8F0a4afC856063f1fF42a30C9";
let tokenAddress = '0xed24fc36d5ee211ea25a80239fb8c4cfd80f12ee';//BUSD
let balance = await getTokenBalance(tokenAddress, from);
let amount = 0.1;
const tokenContract = new web3.eth.Contract(erc20Abi, tokenAddress);
const input = tokenContract.methods.transfer(toWallet, web3.utils.toWei((amount).toString(), 'ether')).encodeABI();
if (parseFloat(balance) > amount) {
console.log(`Transferring ${amount} BUSD from ${from} to ${toWallet}.`)
transfer(from, tokenAddress, 0, input);
} else {
console.log('Insufficient balance to transfer!');
}
}
/**
* 转移原生代币
*/
async function transferBnB() {
let account = web3.eth.accounts.privateKeyToAccount(process.env.PRIVATE_KEY);
let from = account.address;
let balance = await getBnbBalance(from);
let to = "0xF5FD98884ba506B8F0a4afC856063f1fF42a30C9";
let amount = 0.01;
if (balance > amount) {
console.log(`Transferring ${amount} BNB from ${from} to ${to}.`)
transfer(from, to, amount, '');
} else {
console.log('Insufficient balance to transfer!');
}
}
//在源代码的基础上，调用代币的transfer功能转移代币（比如WBNB）
transferErc20();
transferBnB();
运行结果:
