10930ce264
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Implemented core execution engine components for building and executing arbitrage transactions with flashloan support. Transaction Builder (transaction_builder.go): - Builds executable transactions from arbitrage opportunities - Protocol-specific transaction encoding (V2, V3, Curve) - Single and multi-hop swap support - EIP-1559 gas pricing with profit-based optimization - Slippage protection with configurable basis points - Gas limit estimation with protocol-specific costs - Transaction validation and profit estimation - Transaction signing with private keys Protocol Encoders: - UniswapV2Encoder (uniswap_v2_encoder.go): * swapExactTokensForTokens for single and multi-hop * swapExactETHForTokens / swapExactTokensForETH * Proper ABI encoding with dynamic arrays * Path building for multi-hop routes - UniswapV3Encoder (uniswap_v3_encoder.go): * exactInputSingle for single swaps * exactInput for multi-hop with encoded path * exactOutputSingle for reverse swaps * Multicall support for batching * Q64.96 price limit support * 3-byte fee encoding in paths - CurveEncoder (curve_encoder.go): * exchange for standard swaps * exchange_underlying for metapools * Dynamic exchange for newer pools * Coin index mapping helpers * get_dy for quote estimation Flashloan Integration (flashloan.go): - Multi-provider support (Aave V3, Uniswap V3, Uniswap V2) - Provider selection based on availability and fees - Fee calculation for each provider: * Aave V3: 0.09% (9 bps) * Uniswap V3: 0% (fee paid in swap) * Uniswap V2: 0.3% (30 bps) - AaveV3FlashloanEncoder: * flashLoan with multiple assets * Mode 0 (no debt, repay in same tx) * Custom params passing to callback - UniswapV3FlashloanEncoder: * flash function with callback data * Amount0/Amount1 handling - UniswapV2FlashloanEncoder: * swap function with callback data * Flash swap mechanism Key Features: - Atomic execution with flashloans - Profit-based gas price optimization - Multi-protocol routing - Configurable slippage tolerance - Deadline management for time-sensitive swaps - Comprehensive error handling - Structured logging throughout Configuration: - Default slippage: 0.5% (50 bps) - Max slippage: 3% (300 bps) - Gas limit multiplier: 1.2x (20% buffer) - Max gas limit: 3M gas - Default deadline: 5 minutes - Max priority fee: 2 gwei - Max fee per gas: 100 gwei Production Ready: - All addresses for Arbitrum mainnet - EIP-1559 transaction support - Latest signer for chain ID - Proper ABI encoding with padding - Dynamic array encoding - Bytes padding to 32-byte boundaries Total Code: ~1,200 lines across 5 files 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>