package v2 import ( "context" "github.com/ethereum/go-ethereum" "github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/core/types" "math/big" ) type V2Backend interface { SuggestGasPrice(ctx context.Context) (*big.Int, error) PendingCodeAt(ctx context.Context, account common.Address) ([]byte, error) PendingNonceAt(ctx context.Context, account common.Address) (uint64, error) SubscribeFilterLogs(ctx context.Context, q ethereum.FilterQuery, ch chan<- types.Log) (ethereum.Subscription, error) HeaderByNumber(ctx context.Context, number *big.Int) (*types.Header, error) SendTransaction(ctx context.Context, tx *types.Transaction) error SuggestGasTipCap(ctx context.Context) (*big.Int, error) EstimateGas(ctx context.Context, msg ethereum.CallMsg) (uint64, error) }