init: 初始化 AssetX 项目仓库
包含 webapp（Next.js 用户端）、webapp-back（Go 后端）、 antdesign（管理后台）、landingpage（营销落地页）、 数据库 SQL 和配置文件。
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477
ytLending清算文档-final.txt
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477
ytLending清算文档-final.txt
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ytLending清算文档
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重要说明
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本清算机器人采用无状态轮询设计，通过监听链上事件发现活跃借款人，并自动执行清算操作以保护协议免受坏账风险。
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核心特性：
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- 无状态设计：无需数据库，所有数据从链上实时查询
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- 轮询模式：每 5 秒检查一次新区块
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- 事件驱动：监听 4 种事件发现活跃借款人
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- 批量清算：一次交易清算多个账户，节省 Gas
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目录
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1.[系统启动流程](#1-系统启动流程)
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2.[主循环轮询流程](#2-主循环轮询流程)
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3.[活跃地址获取流程](#3-活跃地址获取流程)
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4.[清算检查流程](#4-清算检查流程)
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5.[批量清算执行流程](#5-批量清算执行流程)
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6.[重要参数说明](#6-重要参数说明)
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7.[完整脚本](#7-完整脚本)
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8.[运行和部署](#8-运行和部署)
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1. 系统启动流程
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启动命令：
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Bash
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npx hardhat run scripts/liquidation_bot/index.ts --network arbSepolia
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启动步骤：
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步骤 1 — 初始化 Hardhat 环境，读取网络配置
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Plain Text
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network: arbSepolia
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chainId: 421614
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rpcUrl: https://arbitrum-sepolia.gateway.tenderly.co
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步骤 2 — 读取部署信息（`deployments-lending.json`），加载合约地址
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Plain Text
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Lending Proxy: 0xCb4E7B1069F6C26A1c27523ce4c8dfD884552d1D
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Base Token (USDC): 0x75faf114eafb1BDbe2F0316DF893fd58CE46AA4d
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Collateral Assets:
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YT-A: 0x97204190B35D9895a7a47aa7BaC61ac08De3cF05
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YT-B: 0x181ef4011c35C4a2Fda08eBC5Cf509Ef58E553fF
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YT-C: 0xE9A5b9f3a2Eda4358f81d4E2eF4f3280A664e5B0
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注：Price Feed 合约不再需要初始化
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步骤 3 — 初始化签名者（从 `PRIVATE_KEY` 环境变量读取）
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Plain Text
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Liquidator Address: 0x...
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ETH Balance: 0.5 ETH
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要求：
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- 需要 ETH 支付 Gas 费用
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- 建议保持至少 0.1 ETH 余额
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步骤 4 — 初始化合约实例
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TypeScript
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lendingContract = await ethers.getContractAt(
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'Lending',
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deployment.lendingProxy,
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signer
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)
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步骤 5 — 进入主循环
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2. 主循环轮询流程
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主循环参数：LOOP_DELAY = 5000ms（5 秒）
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循环步骤：
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1.调用 provider.getBlockNumber() 获取当前区块号
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2.判断是否为新区块：
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- 新区块 → 执行清算逻辑（见下方步骤 3）
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- 已检查过 → 等待 5 秒后继续
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3.执行 liquidateUnderwaterBorrowers(lendingContract, signer)：
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￮① 获取活跃地址（查询事件）
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￮② 检查每个地址是否可清算
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￮③ 批量执行清算
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4.更新 lastBlockNumber = currentBlockNumber，循环回步骤 1
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容错机制：
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TypeScript
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try {
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// 执行清算逻辑
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} catch (error) {
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console.error('Error in main loop:', error)
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// 继续运行，不中断
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}
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// 无论成功或失败，都等待 5 秒后继续
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await sleep(5000)
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关键设计决策：
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参数 值 说明
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LOOP_DELAY 5000ms 轮询间隔
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去重检查 lastBlockNumber 每个区块只处理一次，避免重复
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容错机制 try-catch 异常不中断，继续运行
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3. 活跃地址获取流程
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函数：getUniqueAddresses(lendingContract)，LOOKBACK_BLOCKS = 10000
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步骤 1 — 计算查询区块范围
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Plain Text
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currentBlock = 12345678
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fromBlock = 12345678 - 10000 = 12335678
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toBlock = 12345678
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时间窗口（Arbitrum Sepolia，出块 ~1 秒）：
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10000 区块 ≈ 2.7 小时
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步骤 2 — 查询 4 种事件，提取活跃地址
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事件 说明 提取字段
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Withdraw 用户借款/提取 USDC event.args.src、event.args.dst
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Supply 用户存入 USDC event.args.from、event.args.dst
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SupplyCollateral 用户存入抵押品 event.args.from、event.args.dst
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WithdrawCollateral 用户提取抵押品 event.args.src、event.args.to
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步骤 3 — 合并去重
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使用 Set<string> 自动去重，示例：
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Plain Text
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总事件数: 150 + 80 + 120 + 90 = 440 个
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唯一地址数: 85 个（去重后）
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覆盖率对比：
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Compound V3（仅 Withdraw）: ~95%
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本机器人（4 种事件）: ~98%
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步骤 4 — 返回地址列表，进入清算检查
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4. 清算检查流程
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遍历所有活跃地址，对每个地址执行：
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1.调用 lendingContract.isLiquidatable(address)（链上计算）
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2.结果判断：
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- false → 跳过（账户健康）
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- true → 加入清算列表 `liquidatableAccounts[]`
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3.继续检查下一个地址，全部检查完毕后进入批量清算
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5. 批量清算执行流程
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清算列表示例： `[0xAlice, 0xBob, 0xCharlie]`，共 3 个可清算账户
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步骤 1 — 检查列表是否为空
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•空列表 → 无清算，等待下一轮
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•非空 → 继续执行
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**步骤 2 — 调用 `absorbMultiple()`**
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Solidity
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function absorbMultiple(
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address absorber, // 清算者地址（机器人）
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address[] accounts // [0xAlice, 0xBob, 0xCharlie]
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) external override nonReentrant
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// 修饰符检查：
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// ✓ nonReentrant - 防重入保护
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// ✓ 未暂停检查
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步骤 3 — 累积利息（`accrueInternal()`）
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•更新 supplyIndex（存款利息）
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•更新 borrowIndex（借款利息）
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•确保清算时使用最新的债务余额
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**步骤 4 — 对每个账户执行 `_absorbInternal()`**
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以 Alice 为例：
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1.再次验证可清算性：if (!isLiquidatable(Alice)) revert NotLiquidatable()（防止抢跑）
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2.获取用户债务：principal = userBasic[Alice].principal（负数 = 借款，如 -1000e6）
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3.遍历所有抵押资产 [YT-A, YT-B, YT-C]，获取抵押数量
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4.计算抵押品价值：collateralValue = collateralAmount × assetPrice × liquidationFactor(0.95)
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5.转移抵押品：userCollateral[Alice][asset] = 0，userCollateral[absorber][asset] += collateralAmount
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6.清零债务：userBasic[Alice].principal = 0，totalBorrowBase -= 1000e6
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结果： Alice 债务清零，抵押品转移给清算者，清算者获得 5% 折扣
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步骤 5 — 继续清算 Bob、Charlie（相同流程）
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步骤 6 — 发送交易并等待确认
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TypeScript
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const tx = await lendingContract.absorbMultiple(
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await signer.getAddress(), // 清算者地址
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liquidatableAccounts // [Alice, Bob, Charlie]
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)
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const receipt = await tx.wait()
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清算结果示例：
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Plain Text
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✅ Liquidation successful!
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Transaction: 0xabc123...
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Gas used: 450,000
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Block: 12345679
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清算了 3 个账户:
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0xAlice: $1,000 债务
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0xBob: $500 债务
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0xCharlie: $2,000 债务
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清算者获得的抵押品:
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YT-A: 500 个（估值 $1,750）
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YT-B: 800 个（估值 $1,600）
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总价值: $3,350（覆盖 $3,500 债务，5% 折扣）
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6. 重要参数说明
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6.1 轮询参数
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参数名 值 单位 说明 调优建议
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LOOP_DELAY 5000 毫秒 轮询间隔 测试网 5000ms / 主网高活跃 2000ms / 激进模式 1000ms（注意 RPC 限流）
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LOOKBACK_BLOCKS 10000 区块 事件查询范围 Arbitrum 测试网 50000（~14小时）/ Arbitrum 主网 10000-20000（~3-6小时）/ 以太坊主网 10000（~33小时）
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时间窗口参考：
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Plain Text
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Arbitrum（出块 ~1 秒）:
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10000 区块 ≈ 2.7 小时
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50000 区块 ≈ 14 小时
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100000 区块 ≈ 28 小时
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Ethereum 主网（出块 ~12 秒）:
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10000 区块 ≈ 33 小时
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6.2 合约参数（只读）
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参数名 典型值 精度 说明 位置
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borrowCollateralFactor 0.80 18 decimals 借款抵押率（80% LTV） assetConfig
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liquidateCollateralFactor 0.85 18 decimals 清算触发阈值（85%） assetConfig
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liquidationFactor 0.95 18 decimals 清算激励因子（5% 折扣） 全局配置
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storeFrontPriceFactor 0.50 18 decimals buyCollateral 折扣系数 全局配置
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三个抵押率的关系：
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Plain Text
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正常借款 → 接近清算 → 触发清算 → 清算完成
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80% 83% 85% 清零
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(借款) (预警) (清算) (债务)
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健康因子计算：
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Plain Text
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healthFactor = (collateralValue × 0.85) / debtValue
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healthFactor > 1.0：安全
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healthFactor < 1.0：可清算
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6.3 监听事件类型
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事件名 触发场景 提取字段 说明
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Withdraw 用户借款/提取 USDC src, dst 最主要的借款信号
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Supply 用户存入 USDC from, dst 可能有借款人还款
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SupplyCollateral 用户存入抵押品 from, dst 借款前的准备动作
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WithdrawCollateral 用户提取抵押品 src, to 可能触发清算条件
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6.4 日志示例
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Plain Text
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[2025-01-06T10:30:15.000Z] Block: 12345678
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📊 Querying events from block 12335678 to 12345678...
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- Withdraw events: 150
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- Supply events: 80
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- SupplyCollateral events: 120
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- WithdrawCollateral events: 90
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✅ Found 85 unique addresses from all events
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🔍 Checking 85 addresses for liquidation...
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💰 Liquidatable: 0xAlice...1234
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💰 Liquidatable: 0xBob...5678
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💰 Liquidatable: 0xEve...9012
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🎯 Found 3 liquidatable accounts
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📤 Sending liquidation transaction...
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🔗 Transaction sent: 0xabc123...
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✅ Liquidation successful!
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Gas used: 450000
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Block: 12345679
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7. 完整脚本
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index.ts
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TypeScript
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import hre from 'hardhat';
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import { liquidateUnderwaterBorrowers } from './liquidateUnderwaterBorrowers';
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import * as fs from 'fs';
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import * as path from 'path';
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const LOOP_DELAY = 5000; // 5 秒轮询间隔
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async function main() {
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const network = hre.network.name;
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const chainId = hre.network.config.chainId;
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console.log('\n==========================================');
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console.log('🤖 YT Lending Liquidation Bot Started');
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console.log('==========================================');
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console.log('Network:', network);
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console.log('Chain ID:', chainId);
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console.log('Loop Delay:', LOOP_DELAY, 'ms\n');
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const deploymentsPath = path.join(__dirname, '../../deployments-lending.json');
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if (!fs.existsSync(deploymentsPath)) {
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throw new Error('deployments-lending.json not found');
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}
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const deployments = JSON.parse(fs.readFileSync(deploymentsPath, 'utf-8'));
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const deployment = deployments[chainId?.toString() || '421614'];
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if (!deployment) {
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throw new Error(`No deployment found for chainId: ${chainId}`);
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}
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console.log('📋 Contract Addresses:');
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console.log(' Lending Proxy:', deployment.lendingProxy);
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console.log(' Base Token (USDC):', deployment.usdcAddress);
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console.log('');
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const [signer] = await hre.ethers.getSigners();
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console.log('👤 Liquidator Address:', await signer.getAddress());
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console.log('💰 Liquidator Balance:', hre.ethers.formatEther(await hre.ethers.provider.getBalance(signer)), 'ETH\n');
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const lendingContract = await hre.ethers.getContractAt(
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'Lending',
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deployment.lendingProxy,
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signer
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);
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console.log('✅ Contracts initialized\n');
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console.log('==========================================');
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console.log('🔄 Starting main loop...\n');
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let lastBlockNumber: number | undefined;
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while (true) {
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try {
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const currentBlockNumber = await hre.ethers.provider.getBlockNumber();
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console.log(`[${new Date().toISOString()}] Block: ${currentBlockNumber}`);
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if (currentBlockNumber !== lastBlockNumber) {
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lastBlockNumber = currentBlockNumber;
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await liquidateUnderwaterBorrowers(lendingContract, signer);
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console.log('');
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} else {
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console.log(`Block already checked; waiting ${LOOP_DELAY}ms...\n`);
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}
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await new Promise(resolve => setTimeout(resolve, LOOP_DELAY));
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} catch (error) {
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console.error('❌ Error in main loop:', error);
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console.log(`Retrying in ${LOOP_DELAY}ms...\n`);
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await new Promise(resolve => setTimeout(resolve, LOOP_DELAY));
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}
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}
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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('❌ Fatal error:', error);
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process.exit(1);
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});
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liquidateUnderwaterBorrowers.ts
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TypeScript
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import hre from 'hardhat';
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import { Signer } from 'ethers';
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const LOOKBACK_BLOCKS = 10000;
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export async function getUniqueAddresses(lendingContract: any): Promise<string[]> {
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const currentBlock = await hre.ethers.provider.getBlockNumber();
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const fromBlock = Math.max(currentBlock - LOOKBACK_BLOCKS, 0);
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console.log(`📊 Querying events from block ${fromBlock} to ${currentBlock}...`);
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const uniqueAddresses = new Set<string>();
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try {
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const withdrawEvents = await lendingContract.queryFilter(
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lendingContract.filters.Withdraw(), fromBlock, currentBlock
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);
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for (const event of withdrawEvents) {
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if (event.args?.src) uniqueAddresses.add(event.args.src);
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if (event.args?.dst) uniqueAddresses.add(event.args.dst);
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}
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console.log(` - Withdraw events: ${withdrawEvents.length}`);
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} catch (error) {
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console.error(' ⚠️ Failed to query Withdraw events:', error);
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}
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try {
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const supplyEvents = await lendingContract.queryFilter(
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lendingContract.filters.Supply(), fromBlock, currentBlock
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);
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for (const event of supplyEvents) {
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if (event.args?.from) uniqueAddresses.add(event.args.from);
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if (event.args?.dst) uniqueAddresses.add(event.args.dst);
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}
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console.log(` - Supply events: ${supplyEvents.length}`);
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} catch (error) {
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console.error(' ⚠️ Failed to query Supply events:', error);
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}
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try {
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const supplyCollateralEvents = await lendingContract.queryFilter(
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lendingContract.filters.SupplyCollateral(), fromBlock, currentBlock
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||||
);
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for (const event of supplyCollateralEvents) {
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if (event.args?.from) uniqueAddresses.add(event.args.from);
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if (event.args?.dst) uniqueAddresses.add(event.args.dst);
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}
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console.log(` - SupplyCollateral events: ${supplyCollateralEvents.length}`);
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} catch (error) {
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console.error(' ⚠️ Failed to query SupplyCollateral events:', error);
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}
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try {
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const withdrawCollateralEvents = await lendingContract.queryFilter(
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lendingContract.filters.WithdrawCollateral(), fromBlock, currentBlock
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||||
);
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||||
for (const event of withdrawCollateralEvents) {
|
||||
if (event.args?.src) uniqueAddresses.add(event.args.src);
|
||||
if (event.args?.to) uniqueAddresses.add(event.args.to);
|
||||
}
|
||||
console.log(` - WithdrawCollateral events: ${withdrawCollateralEvents.length}`);
|
||||
} catch (error) {
|
||||
console.error(' ⚠️ Failed to query WithdrawCollateral events:', error);
|
||||
}
|
||||
|
||||
console.log(`✅ Found ${uniqueAddresses.size} unique addresses from all events`);
|
||||
return Array.from(uniqueAddresses);
|
||||
}
|
||||
|
||||
export async function liquidateUnderwaterBorrowers(
|
||||
lendingContract: any,
|
||||
signer: Signer
|
||||
): Promise<boolean> {
|
||||
const uniqueAddresses = await getUniqueAddresses(lendingContract);
|
||||
|
||||
if (uniqueAddresses.length === 0) {
|
||||
console.log('ℹ️ No active addresses found');
|
||||
return false;
|
||||
}
|
||||
|
||||
console.log(`🔍 Checking ${uniqueAddresses.length} addresses for liquidation...`);
|
||||
|
||||
const liquidatableAccounts: string[] = [];
|
||||
|
||||
for (const address of uniqueAddresses) {
|
||||
try {
|
||||
const isLiquidatable = await lendingContract.isLiquidatable(address);
|
||||
if (isLiquidatable) {
|
||||
console.log(`💰 Liquidatable: ${address}`);
|
||||
liquidatableAccounts.push(address);
|
||||
}
|
||||
} catch (error) {
|
||||
console.error(`Error checking ${address}:`, error);
|
||||
}
|
||||
}
|
||||
|
||||
if (liquidatableAccounts.length > 0) {
|
||||
console.log(`\n🎯 Found ${liquidatableAccounts.length} liquidatable accounts`);
|
||||
console.log('📤 Sending liquidation transaction...');
|
||||
|
||||
try {
|
||||
const liquidatorAddress = await signer.getAddress();
|
||||
const tx = await lendingContract.connect(signer).absorbMultiple(
|
||||
liquidatorAddress,
|
||||
liquidatableAccounts
|
||||
);
|
||||
|
||||
console.log(`🔗 Transaction sent: ${tx.hash}`);
|
||||
const receipt = await tx.wait();
|
||||
console.log(`✅ Liquidation successful!`);
|
||||
console.log(` Gas used: ${receipt.gasUsed.toString()}`);
|
||||
console.log(` Block: ${receipt.blockNumber}`);
|
||||
|
||||
return true;
|
||||
} catch (error) {
|
||||
console.error('❌ Liquidation transaction failed:', error);
|
||||
return false;
|
||||
}
|
||||
} else {
|
||||
console.log('✅ No liquidatable accounts found');
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
8. 运行和部署
|
||||
8.1 开发模式（前台运行）
|
||||
Bash
|
||||
npx hardhat run scripts/liquidation_bot/index.ts --network arbSepolia
|
||||
8.2 生产部署（PM2 后台运行）
|
||||
Bash
|
||||
# 1. 安装 PM2
|
||||
npm install -g pm2
|
||||
|
||||
# 2. 启动清算机器人
|
||||
pm2 start scripts/liquidation_bot/index.ts \
|
||||
--name ytlp-liquidation-bot \
|
||||
--interpreter npx \
|
||||
--interpreter-args "hardhat run --network arbSepolia"
|
||||
|
||||
# 3. 查看日志
|
||||
pm2 logs ytlp-liquidation-bot --lines 100
|
||||
|
||||
# 4. 保存配置（开机自启）
|
||||
pm2 save
|
||||
pm2 startup
|
||||
|
||||
# 5. 监控管理
|
||||
pm2 list # 列出所有进程
|
||||
pm2 restart ytlp-liquidation-bot # 重启
|
||||
pm2 stop ytlp-liquidation-bot # 停止
|
||||
pm2 delete ytlp-liquidation-bot # 删除
|
||||
8.3 参数调优指南
|
||||
场景 1：测试网（低活跃度）
|
||||
TypeScript
|
||||
const LOOP_DELAY = 5000; // 5 秒（稳定）
|
||||
const LOOKBACK_BLOCKS = 50000; // ~14 小时（覆盖更多历史）
|
||||
场景 2：主网（高活跃度）
|
||||
TypeScript
|
||||
const LOOP_DELAY = 2000; // 2 秒（快速响应）
|
||||
const LOOKBACK_BLOCKS = 10000; // ~2.7 小时（用户活跃，足够）
|
||||
|
||||
总结
|
||||
本清算机器人采用无状态轮询设计，通过监听多种事件提高覆盖率，对所有 isLiquidatable 为 true 的账户无金额限制地执行清算，确保及时清算水下账户，保护协议免受坏账风险。
|
||||
Reference in New Issue
Block a user