type IWatch interface {
	Watch() error

	Close() error
	DoneSignal() <-chan struct{}
	RegisterWatchEvent(events ...abs.Event) error
	RegisterWatchTopics(topicsIndex int, topics ...common.Hash) error
	RegisterEventHook(event abs.Event, f func(client *rpcclient.EvmClient, log types.Log) error) error
	UpdateProcessedBlockNumber(num uint64) error
	GetProcessedBlockNumber() uint64
	GetContractDesc(addr string) (abs.ContractDesc, error)
}

type Options struct {
	abs.Attrs
}