我用CHATGPT4模型写了一个BSC链专用的三明治攻击型MEV机器人，我的核心诉求就是「实际部署可跑」纯净的BSC链专用的MEV机器人，需要你以专业的角度从逻辑、框架、安全、功能、易操作、性能、代码质量、抗攻击能力、运营成本、策略竞争力等方面做出各项总满分5分的优劣评价及高级建议，以下为DEEPSEEK多次修改后的脚本：

1. 智能合约改进 (v6.0) <SOLIDITY>

// contracts/SandwichV6.sol
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

interface IRouter {
function swapExactBNBForTokens(uint, address[] calldata, address, uint) external payable;
function swapExactTokensForBNB(uint, uint, address[] calldata, address, uint) external;
function getAmountsOut(uint, address[] calldata) external view returns (uint[] memory);
}

contract BSCSandwichV6 is ReentrancyGuard {
using SafeERC20 for IERC20;

text
struct AttackSession {
    address token;
    uint256 held;
    uint256 initResIn;
    uint256 initResOut;
    uint256 deadline;
    uint256 minProfit;
    uint8 stopLoss;
    uint8 maxBatches;
    uint8 currentBatch;
    uint8 retryCount;
}

IRouter public immutable router;
address public immutable executor;
mapping(bytes32 => AttackSession) public sessions;
mapping(address => address[][]) public altRoutes; // 多路径缓存

event SessionCreated(bytes32 indexed id, address token);
event BatchSold(bytes32 indexed id, uint256 amount, uint256 profit, uint8 pathIndex);
event SessionClosed(bytes32 indexed id, uint256 totalProfit, uint8 status);

constructor(address _router) {
    router = IRouter(_router);
    executor = msg.sender;
}

function executeAttack(
    address[] calldata path,
    uint256 amountIn,
    uint256 minProfit,
    uint256 timeout,
    uint8 stopLoss,
    uint8 maxBatches
) external payable nonReentrant returns (bytes32) {
    require(msg.sender == executor, "Unauthorized");
    (uint256 rIn, uint256 rOut) = _getReserves(path[1]);
    
    // 增强价格冲击检查
    uint256 priceImpact = (amountIn * 1e4) / rIn;
    require(priceImpact < 1500, "Price impact exceeds 15%"); 

    router.swapExactBNBForTokens{value: amountIn}(
        _calcMinOut(rIn, rOut, amountIn, 500), // 0.5%滑点
        path,
        address(this),
        block.timestamp + 60
    );

    bytes32 sessionId = keccak256(abi.encodePacked(blockhash(block.number-1), path));
    sessions[sessionId] = AttackSession({
        token: path[1],
        held: IERC20(path[1]).balanceOf(address(this)),
        initResIn: rIn,
        initResOut: rOut,
        deadline: block.timestamp + timeout,
        minProfit: minProfit,
        stopLoss: stopLoss,
        maxBatches: maxBatches,
        currentBatch: 0,
        retryCount: 0
    });

    emit SessionCreated(sessionId, path[1]);
    return sessionId;
}

function liquidatePosition(
    bytes32 id,
    address[][] calldata altPaths
) external nonReentrant {
    AttackSession storage s = sessions[id];
    require(msg.sender == executor, "Unauthorized");

    uint256 totalProfit;
    while(s.currentBatch < s.maxBatches) {
        (bool shouldStop, uint8 status) = _evaluateConditions(s);
        if (shouldStop) {
            _finalize(id, totalProfit, status);
            return;
        }

        (uint256 amount, bool isLast) = _smartBatchCalculation(s);
        (bool success, uint256 profit) = _multiPathSell(s.token, amount, altPaths);
        
        if (success) {
            totalProfit += profit;
            if (totalProfit >= s.minProfit) break;
        } else if (isLast) {
            break;
        }
        
        s.currentBatch++;
    }
    
    _finalize(id, totalProfit, 1);
}

function _smartBatchCalculation(AttackSession storage s) internal view returns (uint256, bool) {
    uint256 currentBalance = address(this).balance;
    (uint256 rIn, uint256 rOut) = _getReserves(s.token);
    uint256 remainingProfit = s.minProfit > currentBalance ? s.minProfit - currentBalance : 0;
    
    // 动态滑点感知计算
    uint256 slippage = _calcDynamicSlippage(rIn, rOut, s.held);
    uint256 adjustedProfit = remainingProfit * (10000 + slippage) / 10000;
    
    uint256 dynamicPortion = adjustedProfit > 0 
        ? (adjustedProfit * 1e4) / (rOut * 95/100) // 保留5%缓冲
        : 100 / s.maxBatches;
        
    uint256 amount = s.held * dynamicPortion / 1e4;
    return (amount, s.currentBatch == s.maxBatches - 1);
}

function _multiPathSell(
    address token,
    uint256 amount,
    address[][] memory paths
) internal returns (bool, uint256) {
    for (uint8 i = 0; i < paths.length; i++) {
        (bool success, uint256 profit) = _trySwap(token, amount, paths[i]);
        if (success) {
            emit BatchSold(bytes32(0), amount, profit, i);
            return (true, profit);
        }
    }
    return (false, 0);
}

function _trySwap(
    address token,
    uint256 amount,
    address[] memory path
) internal returns (bool, uint256) {
    IERC20(token).safeApprove(address(router), amount);
    try router.swapExactTokensForBNB(
        amount,
        _calcMinOutForPath(amount, path),
        path,
        address(this),
        block.timestamp + 60
    ) {
        return (true, address(this).balance);
    } catch {
        return (false, 0);
    }
}

function _calcDynamicSlippage(uint256 rIn, uint256 rOut, uint256 held) internal pure returns (uint256) {
    uint256 impact = (held * 1e4) / rIn;
    return impact > 500 ? 1000 : impact * 2; // 动态滑点公式
}

}
2. 前端系统升级 (v6.0)
<JAVASCRIPT>
// src/engine/SandwichEngineV6.js
import { HardhatFork } from 'hardhat-network-helpers';
import { Kafka } from 'kafkajs';
import { PrismaClient } from '@prisma/client';
import { GasOracle } from './gas-strategy';

const prisma = new PrismaClient();
const kafka = new Kafka({ brokers: ['kafka:9092'] });

class SandwichEngineV6 {
constructor(config) {
this.router = config.router;
this.kafkaProducer = kafka.producer();
this.gasOracle = new GasOracle(config.chainId);
this.simCache = new Map(); // 模拟结果缓存
}

async start() {
await this.kafkaProducer.connect();
this.gasOracle.start();
this.initKafkaConsumer();
}

async handleTx(tx) {
const cached = this.simCache.get(tx.hash);
if (cached) {
if (cached.profitability < config.minProfit) return;
return this.createAttackJob(cached);
}

text
const quickAnalysis = this.quickAnalyze(tx);
if (quickAnalysis.potential > 2.0) {
  const deepSim = await this.optimizedDeepSim(tx);
  if (!deepSim.success || deepSim.profit < 0) {
    await prisma.failedTx.create({ data: { hash: tx.hash, reason: 'negative_profit' } });
    return;
  }
  this.simCache.set(tx.hash, deepSim, { ttl: 60000 }); // 缓存1分钟
}

if (quickAnalysis.profitability > config.minProfit) {
  await this.kafkaProducer.send({
    topic: 'mev-attacks',
    messages: [{ value: JSON.stringify(this.prepareJob(tx)) }]
  });
}

}

async optimizedDeepSim(tx) {
const fork = await HardhatFork.createQuickFork(tx.blockNumber);
const result = await fork.simulateTx(tx, { fastMode: true });
return {
success: result.success,
profit: result.balanceChange,
gasUsed: result.gasUsed
};
}
}
3. 动态策略引擎 (v6.0)
<JAVASCRIPT>
// src/strategies/DynamicStrategyV3.js
export class DynamicStrategyEngineV3 {
constructor() {
this.strategies = {
standard: {
batches: (ctx) => Math.min(5, Math.ceil(ctx.amount / 1e18)), // BNB计价
slippage: (ctx) => ctx.volatility * 0.8 + 0.1,
gasPriority: 'medium'
},
whale: {
batches: 2,
slippage: 0.08,
gasPriority: 'high',
useFlashbots: true
}
};
}

selectStrategy(ctx) {
if (ctx.amount > 50 * 1e18) return this.strategies.whale;
return this.strategies.standard;
}

async calculateGas(txContext) {
const baseFee = await this.gasOracle.getBaseFee();
const priority = {
low: 1.2,
medium: 1.5,
high: 2.0
}[txContext.priority];

text
return {
  maxFeePerGas: baseFee * 2.5,
  maxPriorityFeePerGas: baseFee * priority
};

}
}
4. 数据持久化与监控
<JAVASCRIPT>
// src/monitoring/DataPipeline.js
import { InfluxDB } from '@influxdata/influxdb-client';

const influx = new InfluxDB({
url: process.env.INFLUX_URL,
token: process.env.INFLUX_TOKEN
});

export class AttackLogger {
constructor() {
this.writeApi = influx.getWriteApi('mev', 'transactions');
}

async logAttack(session) {
const point = new Point('attack')
.tag('token', session.token)
.floatField('profit', session.profit)
.intField('gas_used', session.gasUsed)
.timestamp(new Date());
this.writeApi.writePoint(point);
}

async getHistoricalPerformance() {
const queryApi = influx.getQueryApi('mev');
const fluxQuery = from(bucket:"mev") |> range(start: -7d) |> filter(fn: (r) => r._measurement == "attack");
return queryApi.collectRows(fluxQuery);
}
}
5. Docker化部署
<DOCKERFILE>

Dockerfile

FROM node:18-alpine

WORKDIR /app
COPY package*.json ./
RUN npm ci --production

COPY . .
RUN npm run build

ENV NODE_ENV=production
CMD ["node", "./dist/main.js"]
<YAML>

docker-compose.yml

version: '3.8'

services:
mev-bot:
build: .
environment:
- REDIS_URL=redis://redis:6379
- KAFKA_BROKERS=kafka:9092
depends_on:
- redis
- kafka
- influxdb

redis:
image: redis:alpine

kafka:
image: bitnami/kafka
environment:
- KAFKA_CFG_NODE_ID=0

influxdb:
image: influxdb:2.0
volumes:
- influx-data:/var/lib/influxdb2

volumes:
influx-data:
6. 自动化测试套件
<JAVASCRIPT>
// test/SandwichV6.test.js
import { ethers } from 'hardhat';
import { expect } from 'chai';

describe('BSCSandwichV6', () => {
let contract;
let executor;

before(async () => {
[executor] = await ethers.getSigners();
const Factory = await ethers.getContractFactory('BSCSandwichV6');
contract = await Factory.deploy(routerAddress);
});

describe('#executeAttack', () => {
it('should reject high price impact', async () => {
await expect(
contract.executeAttack(..., { value: overAmount })
).to.be.revertedWith('Price impact exceeds');
});
});

describe('#liquidatePosition', () => {
it('should try multiple paths', async () => {
await contract.liquidatePosition(sessionId, [path1, path2]);
expect(...).to.emit('BatchSold');
});
});
});