apr

type Reader interface {
	Config() *params.ChainConfig
	GetHeaderByHash(hash common.Hash) *block.Header
	// GetHeader retrieves a block header from the database by hash and number.
	GetHeader(hash common.Hash, number uint64) *block.Header
	CurrentHeader() *block.Header
	ReadValidatorSnapshotAtEpoch(
		epoch *big.Int,
		addr common.Address,
	) (*staking.ValidatorWrapper, error)
}