[Feature 11] Gas Optimization

[onlyhyde]

Overview

Implement gas estimation, EIP-1559 pricing, and retry logic with gas bumping.

Implementation Details

Files:

• internal/gas/estimator.go - Gas estimation
• internal/gas/eip1559.go - EIP-1559 gas pricing
• internal/gas/retry.go - Retry with gas bumping

Gas Estimator

type EstimatorConfig struct {
    GasLimitMultiplier float64  // Default: 1.2 (20% buffer)
    MaxGasLimit        uint64   // Default: 3,000,000
    MinGasLimit        uint64   // Default: 21,000
}

func (e *Estimator) Estimate(ctx, msg ethereum.CallMsg) (uint64, error)

EIP-1559 Gas Price Oracle

type GasPrice struct {
    MaxFeePerGas         *big.Int
    MaxPriorityFeePerGas *big.Int
    BaseFee              *big.Int
}

func (o *PriceOracle) GetGasPrice(ctx) (*GasPrice, error)

• Get base fee from latest block
• Get priority fee from eth_maxPriorityFeePerGas
• Calculate: MaxFee = 2 * BaseFee + PriorityFee
• Apply configurable max limits

Retry Logic

type RetryConfig struct {
    MaxRetries       int           // Default: 3
    InitialDelay     time.Duration // Default: 5s
    MaxDelay         time.Duration // Default: 30s
    GasBumpPercent   int64         // Default: 10 (10%)
    MaxGasBumpFactor int64         // Default: 3 (3x original)
}

Retryable Errors:

• "replacement transaction underpriced"
• "nonce too low"
• "transaction underpriced"
• "intrinsic gas too low"

Gas Bumping: Increase gas price by GasBumpPercent per retry attempt.

Integration

func (s *EVMSigner) SendTransactionWithRetry(
    ctx context.Context,
    to string,
    data []byte,
    gasEstimator *gas.Estimator,
    gasOracle *gas.PriceOracle,
    retrier *gas.Retrier,
) (string, error)

Acceptance Criteria

• Gas estimator with buffer
• EIP-1559 gas price oracle
• Retry logic with exponential backoff
• Gas price bumping on retry
• Max limits enforcement
• Retryable error detection
• Unit tests
• Integration tests with testnet

Dependencies

• [Feature 02] EVM Signer Implementation #21 EVM Signer Implementation

Branch

feature/gas-optimization