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const logger = require('../utils/logger');
class FlashLoanStrategy {
constructor(tradingEngine) {
this.tradingEngine = tradingEngine;
this.minProfitThreshold = 100; // $100 minimum profit
this.maxLoanAmount = 1000000; // $1M max loan
this.isScanning = false;
}
async scan() {
if (this.isScanning) return;
this.isScanning = true;
try {
// Scan for flash loan opportunities
// This would involve checking arbitrage opportunities that require large capital
const opportunities = await this.findFlashLoanOpportunities();
if (opportunities.length > 0) {
logger.info(`Found ${opportunities.length} flash loan opportunities`);
}
} catch (error) {
logger.error('Flash loan scan error:', error);
} finally {
this.isScanning = false;
}
}
async findFlashLoanOpportunities() {
// In production, this would scan for:
// 1. Large arbitrage opportunities
// 2. Liquidation opportunities
// 3. Complex multi-step trades
return [];
}
async execute(userId, params) {
try {
const { amount, strategy: subStrategy } = params;
const loanAmount = parseFloat(amount);
logger.info(`Executing flash loan for user ${userId}: $${loanAmount}`);
if (loanAmount > this.maxLoanAmount) {
throw new Error(`Loan amount exceeds maximum of $${this.maxLoanAmount}`);
}
// Simulate flash loan execution
const steps = [
'Borrowing from AAVE',
'Executing arbitrage',
'Swapping tokens',
'Repaying loan',
'Collecting profit'
];
const executionLog = [];
let currentStep = 0;
for (const step of steps) {
await new Promise(resolve => setTimeout(resolve, 1000));
executionLog.push({
step: ++currentStep,
action: step,
timestamp: Date.now()
});
logger.info(`Flash loan step ${currentStep}: ${step}`);
}
// Calculate profit (15-30% based on strategy)
const profitMultiplier = 0.15 + Math.random() * 0.15; // 15-30%
const grossProfit = loanAmount * profitMultiplier;
// Deduct costs
const flashLoanFee = loanAmount * 0.0009; // 0.09% AAVE fee
const gasFee = 0.05; // ~$50 gas
const platformFee = grossProfit * 0.20; // 20% performance fee
const netProfit = grossProfit - flashLoanFee - gasFee - platformFee;
const mockTxHash = '0x' + Array.from({length: 64}, () =>
Math.floor(Math.random() * 16).toString(16)
).join('');
return {
success: true,
transactionHash: mockTxHash,
strategy: 'flashloan',
loanAmount,
grossProfit,
fees: {
flashLoan: flashLoanFee,
gas: gasFee,
platform: platformFee
},
profit: netProfit,
profitPercentage: (netProfit / loanAmount) * 100,
executionLog,
executionTime: steps.length * 1000,
timestamp: Date.now()
};
} catch (error) {
logger.error('Execute flash loan error:', error);
throw error;
}
}
async estimateProfit(params) {
try {
const { amount } = params;
const loanAmount = parseFloat(amount);
if (loanAmount > this.maxLoanAmount) {
return {
estimated: false,
error: `Loan amount exceeds maximum of $${this.maxLoanAmount}`
};
}
// Estimate profit range
const minProfitPercent = 15;
const maxProfitPercent = 30;
const avgProfitPercent = 22.5;
const grossProfit = loanAmount * (avgProfitPercent / 100);
const flashLoanFee = loanAmount * 0.0009;
const gasFee = 0.05;
const platformFee = grossProfit * 0.20;
const netProfit = grossProfit - flashLoanFee - gasFee - platformFee;
return {
estimated: true,
loanAmount,
expectedProfit: {
min: loanAmount * (minProfitPercent / 100) - flashLoanFee - gasFee - platformFee,
max: loanAmount * (maxProfitPercent / 100) - flashLoanFee - gasFee - platformFee,
avg: netProfit
},
fees: {
flashLoan: flashLoanFee,
gas: gasFee,
platform: platformFee,
total: flashLoanFee + gasFee + platformFee
},
profitPercentage: (netProfit / loanAmount) * 100,
riskLevel: 'high',
requirements: [
'No collateral needed',
'Must be repaid in same transaction',
'Requires profitable opportunity'
]
};
} catch (error) {
logger.error('Estimate flash loan profit error:', error);
throw error;
}
}
}
module.exports = FlashLoanStrategy;
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