add buyCollateral script and add setTargetReserves function for lending contract
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212
scripts/utils/buyCollateral.ts
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212
scripts/utils/buyCollateral.ts
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import { ethers } from "hardhat";
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import { Lending } from "../../typechain-types";
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/**
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* 购买清算抵押品脚本
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*
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* 环境变量:
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* - LENDING_ADDRESS: Lending 合约地址
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* - ASSET_ADDRESS: 抵押品资产地址
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* - BASE_AMOUNT (可选): 愿意支付的最大金额，默认 100
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* - SLIPPAGE (可选): 滑点容忍度 (1-5)，默认 2
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*/
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async function main() {
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// ==================== 配置 ====================
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const LENDING_ADDRESS = process.env.LENDING_ADDRESS;
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const ASSET_ADDRESS = process.env.ASSET_ADDRESS;
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const BASE_AMOUNT_INPUT = process.env.BASE_AMOUNT || "100";
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const SLIPPAGE_PERCENT = parseInt(process.env.SLIPPAGE || "2");
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// 参数验证
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if (!LENDING_ADDRESS || LENDING_ADDRESS === "0x...") {
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throw new Error("❌ 请设置 LENDING_ADDRESS 环境变量");
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}
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if (!ASSET_ADDRESS || ASSET_ADDRESS === "0x...") {
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throw new Error("❌ 请设置 ASSET_ADDRESS 环境变量");
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}
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const SLIPPAGE = SLIPPAGE_PERCENT / 100; // 转换为小数
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console.log("==================== 购买清算抵押品 ====================");
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console.log(`Lending 合约: ${LENDING_ADDRESS}`);
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console.log(`抵押品地址: ${ASSET_ADDRESS}`);
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console.log(`最大支付金额: ${BASE_AMOUNT_INPUT} USDC`);
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console.log(`滑点容忍度: ${SLIPPAGE_PERCENT}%\n`);
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// ==================== 初始化 ====================
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const lending = await ethers.getContractAt("Lending", LENDING_ADDRESS) as unknown as Lending;
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const [buyer] = await ethers.getSigners();
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const baseToken = await lending.baseToken();
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const base = await ethers.getContractAt("IERC20Metadata", baseToken);
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const baseDecimals = await base.decimals();
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const BASE_AMOUNT = ethers.parseUnits(BASE_AMOUNT_INPUT, baseDecimals);
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console.log(`买家地址: ${buyer.address}\n`);
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// ==================== 前置检查 ====================
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console.log("📊 检查系统状态...");
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// 1. 检查储备金状态
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const reserves = await lending.getReserves();
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const targetReserves = await lending.targetReserves();
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console.log(`✓ 当前储备金: ${ethers.formatUnits(reserves, baseDecimals)} USDC`);
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console.log(`✓ 目标储备金: ${ethers.formatUnits(targetReserves, baseDecimals)} USDC`);
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if (reserves >= targetReserves) {
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throw new Error("❌ 储备金充足，当前无法购买抵押品");
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}
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// 2. 检查抵押品储备
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const collateralReserve = await lending.getCollateralReserves(ASSET_ADDRESS);
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if (collateralReserve === 0n) {
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throw new Error("❌ 该抵押品储备为空，无法购买");
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}
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const asset = await ethers.getContractAt("IERC20Metadata", ASSET_ADDRESS);
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const assetDecimals = await asset.decimals();
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console.log(`✓ 抵押品储备: ${ethers.formatUnits(collateralReserve, assetDecimals)} 代币\n`);
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// 3. 检查买家余额
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const buyerBalance = await base.balanceOf(buyer.address);
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console.log(`💰 买家余额: ${ethers.formatUnits(buyerBalance, baseDecimals)} USDC`);
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if (buyerBalance < BASE_AMOUNT) {
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throw new Error(`❌ 余额不足。需要: ${ethers.formatUnits(BASE_AMOUNT, baseDecimals)} USDC，当前: ${ethers.formatUnits(buyerBalance, baseDecimals)} USDC`);
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}
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// ==================== 获取购买信息 ====================
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console.log("\n📋 计算购买详情...");
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const info = await getBuyCollateralInfo(lending, ASSET_ADDRESS, BASE_AMOUNT, SLIPPAGE);
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console.log(`✓ 预期购买: ${ethers.formatUnits(info.expectedAmount, assetDecimals)} 代币`);
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console.log(`✓ 实际购买: ${ethers.formatUnits(info.actualAmount, assetDecimals)} 代币`);
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console.log(`✓ 最小接受: ${ethers.formatUnits(info.minAmount, assetDecimals)} 代币`);
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if (info.isLimited) {
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console.log(`\n⚠️ 储备不足，购买量已调整:`);
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console.log(` 原计划支付: ${ethers.formatUnits(info.baseAmount, baseDecimals)} USDC`);
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console.log(` 实际约支付: ${ethers.formatUnits(info.actualBaseAmount, baseDecimals)} USDC`);
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console.log(` 节省约: ${ethers.formatUnits(info.baseAmount - info.actualBaseAmount, baseDecimals)} USDC`);
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}
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// ==================== 授权检查 ====================
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console.log("\n🔐 检查授权...");
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const allowance = await base.allowance(buyer.address, LENDING_ADDRESS);
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if (allowance < BASE_AMOUNT) {
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console.log(`当前授权: ${ethers.formatUnits(allowance, baseDecimals)} USDC (不足)`);
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console.log("正在授权...");
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const approveTx = await base.approve(LENDING_ADDRESS, ethers.MaxUint256);
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await approveTx.wait();
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console.log("✅ 授权成功");
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} else {
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console.log("✓ 授权充足");
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}
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// ==================== 执行购买 ====================
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console.log("\n💸 执行购买交易...");
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const tx = await lending.buyCollateral(
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ASSET_ADDRESS,
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info.minAmount,
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BASE_AMOUNT,
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buyer.address
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);
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console.log(`交易已提交: ${tx.hash}`);
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console.log("等待确认...");
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const receipt = await tx.wait();
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console.log(`✅ 交易确认! Gas 消耗: ${receipt?.gasUsed.toString()}\n`);
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// ==================== 解析结果 ====================
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const buyEvent = receipt?.logs.find((log: any) => {
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try {
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return lending.interface.parseLog(log)?.name === "BuyCollateral";
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} catch {
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return false;
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}
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});
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if (buyEvent) {
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const parsedEvent = lending.interface.parseLog(buyEvent);
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const paidAmount = parsedEvent?.args.baseAmount;
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const receivedAmount = parsedEvent?.args.collateralAmount;
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console.log("==================== 交易结果 ====================");
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console.log(`✓ 实际支付: ${ethers.formatUnits(paidAmount, baseDecimals)} USDC`);
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console.log(`✓ 实际获得: ${ethers.formatUnits(receivedAmount, assetDecimals)} 代币`);
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console.log(`✓ 购买者: ${parsedEvent?.args.buyer}`);
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console.log(`✓ 接收地址: ${buyer.address}`);
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// 计算实际单价和折扣信息
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// 实际单价 = 支付金额 / 获得数量
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const actualPricePerToken = (paidAmount * ethers.parseUnits("1", assetDecimals)) / receivedAmount;
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// 计算正常市场价（使用 quoteCollateral 反推）
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// 如果用相同的 baseAmount 在市场价购买，能买到多少代币
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const marketAmount = await lending.quoteCollateral(ASSET_ADDRESS, paidAmount);
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console.log(`\n💰 折扣购买说明:`);
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console.log(`✓ 实际单价: ${ethers.formatUnits(actualPricePerToken, baseDecimals)} USDC/代币`);
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// 只有当实际购买量大于市场价购买量时才显示折扣
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if (receivedAmount > marketAmount) {
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const discount = ((receivedAmount - marketAmount) * 10000n) / marketAmount;
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const saved = actualPricePerToken * marketAmount / ethers.parseUnits("1", assetDecimals) - paidAmount;
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console.log(`✓ 市场价可购买: ${ethers.formatUnits(marketAmount, assetDecimals)} 代币`);
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console.log(`✓ 折扣多得: ${ethers.formatUnits(receivedAmount - marketAmount, assetDecimals)} 代币 (${Number(discount) / 100}%)`);
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console.log(`✓ 相当于节省: ${ethers.formatUnits(saved, baseDecimals)} USDC`);
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} else {
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console.log(`ℹ️ 这是清算抵押品的折扣购买，价格低于市场价`);
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}
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console.log("===================================================");
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}
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// ==================== 更新后状态 ====================
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console.log("\n📊 购买后状态:");
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const newBalance = await base.balanceOf(buyer.address);
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const newAssetBalance = await asset.balanceOf(buyer.address);
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console.log(`买家 USDC 余额: ${ethers.formatUnits(newBalance, baseDecimals)} USDC`);
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console.log(`买家抵押品余额: ${ethers.formatUnits(newAssetBalance, assetDecimals)} 代币`);
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console.log("\n✅ 购买完成!");
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}
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main()
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.then(() => process.exit(0))
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.catch((error) => {
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console.error("\n❌ 执行失败:", error.message || error);
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process.exit(1);
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});
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/**
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* 获取详细的购买信息
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*/
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export async function getBuyCollateralInfo(
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lendingContract: Lending,
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asset: string,
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baseAmount: bigint,
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slippageTolerance: number = 0.01
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) {
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const expectedAmount = await lendingContract.quoteCollateral(asset, baseAmount);
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const availableReserve = await lendingContract.getCollateralReserves(asset);
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const actualAmount = expectedAmount < availableReserve ? expectedAmount : availableReserve;
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const slippageMultiplier = BigInt(Math.floor((1 - slippageTolerance) * 1e18));
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const minAmount = (actualAmount * slippageMultiplier) / BigInt(1e18);
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// 估算实际支付金额（基于实际购买量）
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const actualBaseAmount = actualAmount < expectedAmount
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? (baseAmount * actualAmount) / expectedAmount // 按比例计算
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: baseAmount;
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return {
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expectedAmount, // 理想情况下可购买的数量
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availableReserve, // 协议可用储备
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actualAmount, // 实际可购买的数量（限制后）
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minAmount, // 应用滑点保护后的最小值
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baseAmount, // 用户愿意支付的最大金额
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actualBaseAmount, // 实际需要支付的金额（可能更少）
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isLimited: actualAmount < expectedAmount, // 是否受储备限制
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};
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}
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