eth

type E20Cache interface {
	Set(key string, val interface{}) error
	GetString(key string) (out string, err error)
	GetInt64(key string) (int64, error)
	GetUint64(key string) (uint64, error)
}

type ERC20 interface {
	TransferEvents(ctx context.Context, start, end uint64) ([]ERC20Transfer, error)
	BalanceOf(ctx context.Context, addr common.Address) (*big.Int, error)
	Decimals(ctx context.Context) (int, error)
}

type ERC20Transfer struct {
	From        string
	To          string
	Value       *big.Int
	TXHash      string
	LogIndex    uint
	Token       string
	BlockNumber uint64
	Timestamp   time.Time
	TXIndex     uint
}

type EthClient interface {
	BlockNumber(ctx context.Context) (uint64, error)
	BlockByNumber(ctx context.Context, number *big.Int) (*types.Block, error)
}

type Result[T any] struct {
	Err error
	Val T
}