我可以從 Compound Finance Protocol 中藉用更多的賬戶流動性嗎？

我正在開發一個允許使用者在 ETH 上做多/做空的應用程序。走長：

• 向 Compound 協議提供 eth
• 從 Compound Protocol 借用穩定幣（針對提供的 eth）
• 用這個借來的穩定幣在 Uniswap 上購買 eth
• 持有直到eth價格上漲
• 在 Uniswap 上出售 eth，以換取穩定幣
• 將藉入的穩定幣償還給 Compound（連同借入利息）
• 保留差額（以及在 Compound 上賺取的利息）和利潤
• 利潤將以穩定幣形式（可兌換）

我的問題：在提供 ETH 後，當我借用 DAI 並在 Uniswap 上兌換時，即使借入餘額超過流動性，我也可以多次這樣做。

我的智能合約- https://github.com/Rushanksavant/Crypto-Long-Short-Trades/blob/main/contracts/contractLong.sol

JavaScript 程式碼（反應，ethersjs）：

import React from "react";
import { ethers } from 'ethers'
import { useEffect, useState } from 'react'
// import axios from 'axios'
import Web3Modal from 'web3modal'
import contractLong from "../artifacts/contracts/contractLong.sol/contractLong.json"

import Nav from "../components/Nav";


const contractLong_add = "0x8f86403A4DE0BB5791fa46B8e795C547942fE4Cf";



export default function Long() {
const [supplyAmount, setSupplyAmount] = useState(0);

const [maxBorrow, setMaxBorrow] = useState(0);
const [borrowBalance, setBorrowBalance] = useState(0);
const [accLiquidity, setAccLiquidity] = useState(0);

const [contractBalance, setContractBalance] = useState(0);

let web3Modal;
let connection;
let provider;
let signer;

useEffect(() => {
   init()
}, [])

async function init() {
   web3Modal = new Web3Modal()
   connection = await web3Modal.connect()
   provider = new ethers.providers.Web3Provider(connection)
   signer = provider.getSigner()
}

async function supplyETH() {
   init()
   const Long = new ethers.Contract(contractLong_add, contractLong.abi, signer)
   let transaction = await Long.supply({ value: ethers.utils.parseEther(supplyAmount) })
   await transaction.wait()
}

async function goLong() {
   init()
   const Long = new ethers.Contract(contractLong_add, contractLong.abi, signer)
   await Long.goLong_ETH(parseInt(0.5 * maxBorrow), Math.floor(Date.now() / 1000) + 60 * 10)
}

async function get_info() {
   init()
   const Long = new ethers.Contract(contractLong_add, contractLong.abi, provider)
   setSupplyAmount(parseInt(await Long.callStatic.getSuppliedBalance()));
   setMaxBorrow(parseInt(await Long.callStatic.getMaxBorrow()))
   setBorrowBalance(parseInt(await Long.callStatic.getBorrowBalance()))
   setAccLiquidity(parseInt(await Long.callStatic.getAccountLiquidity()))
   setContractBalance(parseInt(await provider.getBalance(contractLong_add)))
   console.log(await Long.callStatic.getAccountLiquidity())
}

async function closePosition() {
   init()
   const Long = new ethers.Contract(contractLong_add, contractLong.abi, signer)
   let transaction = await Long.claimProfits(Math.floor(Date.now() / 1000) + 60 * 10)
   await transaction.wait()
}
return (
   <div className="bg-gray-800">
       <Nav />
       <div className="flex lg:flex-row items-stretch justify-between lg:px-0 px-6 lg:py-20 py-8 2xl:mx-auto 2xl:container">
           <div className="z-30 relative lg:w-1/2">
               <div className="hidden relative dark:bg-gray-800 bg-black w-full lg:w-10/12 lg:h-full lg:flex justify-end items-center">
                   <img src="https://media.istockphoto.com/photos/stock-market-investment-graph-on-financial-numbers-abstract-picture-id1372263450?k=20&m=1372263450&s=612x612&w=0&h=hsM29khQqyPRanTBQg_lSNdJfi9MsP97cC1zlZLKQho=" alt="image with decent chairs" className="w-full relative z-30 lg:h-full" />
                   <div className="w-3/4 absolute -right-20 z-30 px-6 py-10 bg-black h-5/6">
                       <button className="text-white text-2xl font-bold text-center underline lg:mb-3" onClick={get_info}>Live Status:</button><br></br>

                       <p className="text-white text-lg my-2 font-serif">Supplied Amount -</p><p className="text-yellow-500 text-lg my-2 font-serif">{supplyAmount}</p>
                       <p className="text-white text-lg my-2 font-serif">-----------------------</p>
                       <p className="text-white text-lg my-2 font-serif">Max Borrow -</p><p className="text-yellow-500 text-lg my-2 font-serif">{maxBorrow}</p>
                       <p className="text-white text-lg my-2 font-serif">Borrow Baalnce Current -</p><p className="text-yellow-500 text-lg my-2 font-serif">{borrowBalance}</p>
                       <p className="text-white text-lg my-2 font-serif">Account Liquidity -</p><p className="text-yellow-500 text-lg my-2 font-serif">{accLiquidity}</p>
                       <p className="text-white text-lg my-2 font-serif">-----------------------</p>
                       <p className="text-white text-lg my-2 font-serif">ETH holded -</p><p className="text-yellow-500 text-lg my-2 font-serif">{contractBalance}</p>

                   </div>
                   <div className="w-full lg:w-auto lg:-mr-32 lg:pl-20">
                       <div className="w-full relative z-30 lg:pl-5 px-6 py-20 bg-gray-800 lg:mt-10"></div>
                       <div className="w-full relative z-30 lg:pl-5 px-6 py-20 bg-gray-800 lg:pt-5"></div>
                       <div className="w-full relative z-30 lg:pl-5 px-6 py-20 bg-gray-800"></div>
                       <div className="w-full relative z-30 lg:pl-5 px-6 py-20 bg-gray-800 lg:mb-10"></div>
                   </div>
               </div>
               <div className="absolute top-0 dark:bg-gray-800 bg-black md:h-96 w-full hidden md:block lg:hidden"></div>
           </div>
           <div className="bg-gray-300 dark:bg-gray-800 lg:w-1/2 lg:ml-20 lg:p-14 p-8 flex shadow-lg">
               <div>
                   <h1 className="dark:text-white md:w-8/12 lg:w-10/12 xl:8/12 2xl:w-8/12 w-full xl:text-6xl sm:text-5xl text-4xl font-semibold text-gray-800 capitalize">LongETH</h1>
                   <p className="text-gray-800 text-lg my-3 font-serif">To supply ETH to Compound as collateral:</p>
                   <div className="mt-2">
                       <input className="w-20 h-10 mr-5 rounded-lg p-3 hover:bg-gray-100 border-double border-4 border-sky-500 border-gray-800"
                           onChange={(event) => setSupplyAmount(event.target.value)} />
                       <button className=" text-white bg-gray-900 hover:bg-black hover:text-white rounded-md p-4 "
                           onClick={supplyETH}>Supply</button>

                       <p className="text-gray-800 text-lg mt-20 mb-3 font-serif">Click below to go Long on ETH (*you need to Supply ETH before):</p>
                       <button className=" text-white bg-gray-900 hover:bg-black hover:text-white rounded-md p-4 mb-20"
                           onClick={goLong}>Take Position</button><br></br>

                       <p className="text-gray-800 text-lg mb-3 mt-15 font-serif">Click below to claim profits (*ETH price should be increased to get profits):</p>
                       <button className=" text-white bg-gray-900 hover:bg-black hover:text-white rounded-md p-4"
                           onClick={closePosition}>claim Profits</button>
                   </div>
               </div>
           </div>
       </div>
   </div>
)

}

在上圖中：

• 供應量 - 從使用者->合約->複合協議提供的數量
• 最大借款 - 可能的最大借款（美元），基於提供的金額
• Borrow Balance Current - 通過合約從 Compound 借入的餘額
• 賬戶流動性 - 合約流動性
• 持有的 ETH - 合約餘額

您的getMaxBorrow函式返回的值比您想像的要小得多。Compound 協議將令牌值按比例放大，因此它們是整數。

我認為你借了 0.00000000000002173 DAI，但你認為你借了 2173 DAI。嘗試通過 DAI 合約中的小數位數來擴大你的價值。

unscaledAmount * Math.pow(10, 18);

引用自：https://ethereum.stackexchange.com/questions/125926