javascript - 使用 Ethers JS 估算 gas 价格

Question

我正在尝试制作一个简单的 js 机器人，它检查每个区 block 的 eth(或链的主要 token )并将其发送到另一个钱包。

我有一个工作机器人:

const { ethers } = require('ethers')

const provider = new ethers.providers.JsonRpcProvider("")

const addressReceiver = ''

const privateKeys = [""]


const bot = async =>{
    provider.on('block', async () => {
        console.log('Listening to new block, waiting ;)');
        for (let i = 0; i < privateKeys.length; i++){

            const _target = new ethers.Wallet(privateKeys[i]);
            const target = _target.connect(provider);
            const balance = await provider.getBalance(target.address);
            const txBuffer = ethers.utils.parseEther('0.005');
            if (balance.sub(txBuffer) > 0){
                console.log("New Account with Eth!");
                const amount = balance.sub(txBuffer);
                try {
                    await target.sendTransaction({
                        to: addressReceiver,
                        value: amount
                    });
                    console.log(`Success! transferred -->${ethers.utils.formatEther(balance)}`);
                } catch(e){
                    console.log(`error: ${e}`);
                }
            }
        }
    })
}
bot();

但这有一个设置的交易缓冲区，在机器人运行后最终会在钱包中留下一些 eth。我想估算费用，然后从取出的总额中减去这些费用。像这样:

const {
    ethers
} = require('ethers')

const provider = new ethers.providers.JsonRpcProvider("")

const addressReceiver = ''

const privateKeys = [""]

const bot = async =>{
    provider.on('block', async () => {
        console.log('Listening to new block, waiting ;)');

        for (let i = 0; i < privateKeys.length; i++) { 
            const _target = new ethers.Wallet(privateKeys[i]);
            const target = _target.connect(provider);
            const balance = await provider.getBalance(target.address);
            const gasLimit = await provider.estimateGas({
                to: addressReceiver,
                value: await provider.getBalance(target.address),
                gasLimit: 21000,
                gasPrice: ethers.utils.parseUnits('10', 'gwei'),
                nonce: await provider.getTransactionCount(privateKeys[i])
            })


            if (balance.sub(gasLimit) > 0) {
                console.log("New Account with Eth!");
                const amount = balance.sub(gasLimit);
                try {
                    await target.sendTransaction({
                        to: addressReceiver,
                        value: amount
                    });
                    console.log(`Success! transferred -->${ethers.utils.formatEther(balance)}`);
                } catch (e) {
                    console.log(`error: ${e}`);
                }
            }
        }
    })

}
bot();

但这会抛出一个 ENS name not configured 错误。

Answer 1

这里有几个问题:

1. 未计算出 ENS 名称可能是因为 addressReceiver 是一个 ENS 名称(以 .eth 结尾)，而不是地址(以 0x)。使用地址。

2. amount = balance.sub(gasLimit) 不对。 gasLimit 是使用的gas量，不是eth。您需要将其乘以每燃气费才能获得 ETH。计算出确切费用的最简单方法是将 tx.maxFeePerGas 和 tx.maxPriorityFeePerGas 设置为相同的值。这将导致你在大多数时候多付钱。那么新代码将是 amount = balance.sub(tx.maxFeePerGas.mul(gasLimit))