146218ab2e
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Implemented comprehensive risk management and execution strategy components for safe and efficient arbitrage execution. Risk Manager (risk_manager.go - 470 lines): - Pre-execution risk assessment with 10+ validation checks - Transaction simulation using eth_call - Position size limits (default: 10 ETH max per trade) - Daily volume limits (default: 100 ETH per day) - Concurrent transaction limits (default: 5) - Gas price and gas cost limits - Minimum profit and ROI requirements - Slippage validation and protection - Circuit breaker with automatic cooldown - Active transaction tracking - Failure rate monitoring Risk Assessment Features: - Circuit breaker opens after 5 failures in 1 hour - Cooldown period: 10 minutes - Simulation timeout: 5 seconds - Checks position size, daily volume, gas limits - Validates profit, ROI, slippage constraints - Simulates execution before submission - Tracks active transactions and failures - Automatic circuit breaker reset after cooldown Simulation: - eth_call simulation before execution - Detects reverts before spending gas - Calculates actual vs expected output - Measures actual slippage - Validates execution success - Returns detailed simulation results Executor (executor.go - 480 lines): - Complete transaction execution lifecycle - Nonce management with automatic tracking - Transaction submission with retry logic - Confirmation monitoring with configurable blocks - Pending transaction tracking - Automatic transaction replacement on timeout - Private RPC support (Flashbots, etc.) - Graceful shutdown and cleanup Execution Features: - Builds transactions from opportunities - Performs risk assessment before submission - Signs transactions with private key - Submits to public or private RPC - Monitors pending transactions every 1 second - Waits for configurable confirmations (default: 1) - Tracks nonce usage to prevent conflicts - Handles transaction timeouts (default: 5 minutes) - Retries failed transactions (max 3 attempts) - Records successes and failures - Calculates actual profit from receipts Nonce Management: - Initializes from network pending nonce - Increments locally for concurrent submissions - Releases on transaction failure - Prevents nonce gaps and conflicts - Tracks per-nonce transaction status - Automatic cleanup of old transactions Monitoring: - Real-time pending transaction monitoring - Status checking every 1 second - Timeout detection and replacement - Cleanup of completed transactions every 1 minute - Detailed logging of all stages - Statistics and metrics tracking Configuration Options: Risk Manager: - MaxPositionSize: 10 ETH - MaxDailyVolume: 100 ETH - MaxConcurrentTxs: 5 - MaxFailuresPerHour: 10 - MinProfitAfterGas: 0.01 ETH - MinROI: 3% - MaxSlippageBPS: 300 (3%) - MaxGasPrice: 100 gwei - MaxGasCost: 0.05 ETH - CircuitBreakerThreshold: 5 failures - CircuitBreakerCooldown: 10 minutes Executor: - ConfirmationBlocks: 1 - TimeoutPerTx: 5 minutes - MaxRetries: 3 - RetryDelay: 5 seconds - NonceMargin: 2 - GasPriceStrategy: "fast", "market", or "aggressive" - GasPriceMultiplier: 1.1 (10% above market) - MaxGasPriceIncrement: 1.5 (50% max increase) - MonitorInterval: 1 second - CleanupInterval: 1 minute Safety Features: - Comprehensive pre-flight checks - Simulation before execution - Position and volume limits - Concurrent transaction limits - Circuit breaker on repeated failures - Timeout and retry logic - Graceful error handling - Detailed failure tracking - Automatic cooldowns Production Ready: - Full error handling and recovery - Structured logging throughout - Thread-safe state management - Concurrent execution support - Graceful shutdown - Statistics and metrics - Configurable limits and timeouts Integration: - Works seamlessly with TransactionBuilder - Uses FlashloanManager for flashloans - Integrates with RiskManager for safety - Connects to arbitrage opportunities - Supports public and private RPCs Total Code: ~950 lines across 2 files 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>