beaconclient

Documentation

Overview

Package beaconclient defines a service that interacts with a beacon node via a gRPC client to listen for streamed blocks, attestations, and to submit proposer/attester slashings to the node in case they are detected.

Index

• type ChainFetcher
• type Config
• type Notifier
• type Service
  • func NewService(ctx context.Context, cfg *Config) (*Service, error)
  • func (s *Service) AttestationFeed() *event.Feed
  • func (s *Service) BlockFeed() *event.Feed
  • func (s *Service) ChainHead(ctx context.Context) (*ethpb.ChainHead, error)
  • func (s *Service) ClientReadyFeed() *event.Feed
  • func (s *Service) FindOrGetPublicKeys(ctx context.Context, validatorIndices []types.ValidatorIndex) (map[types.ValidatorIndex][]byte, error)
  • func (s *Service) GenesisValidatorsRoot(ctx context.Context) ([]byte, error)
  • func (s *Service) ReceiveAttestations(ctx context.Context)
  • func (s *Service) ReceiveBlocks(ctx context.Context)
  • func (s *Service) RequestHistoricalAttestations(ctx context.Context, epoch types.Epoch) ([]*ethpb.IndexedAttestation, error)
  • func (s *Service) Start()
  • func (s *Service) Status() error
  • func (s *Service) Stop() error

Types

type ChainFetcher

type ChainFetcher interface {
	ChainHead(ctx context.Context) (*ethpb.ChainHead, error)
}

ChainFetcher defines a struct which can retrieve chain information from a beacon node such as the latest chain head.

type Config

type Config struct {
	BeaconProvider        string
	BeaconCert            string
	SlasherDB             db.Database
	ProposerSlashingsFeed *event.Feed
	AttesterSlashingsFeed *event.Feed
	BeaconClient          ethpb.BeaconChainClient
	NodeClient            ethpb.NodeClient
}

Config options for the beaconclient service.

type Notifier

type Notifier interface {
	BlockFeed() *event.Feed
	AttestationFeed() *event.Feed
	ClientReadyFeed() *event.Feed
}

Notifier defines a struct which exposes event feeds regarding beacon blocks, attestations, and more information received from a beacon node.

type Service

type Service struct {
	// contains filtered or unexported fields
}

Service struct for the beaconclient service of the slasher.

func NewService

func NewService(ctx context.Context, cfg *Config) (*Service, error)

NewService instantiation.

func (*Service) AttestationFeed

func (s *Service) AttestationFeed() *event.Feed

AttestationFeed returns a feed other services in slasher can subscribe to attestations received via the beacon node through gRPC.

func (*Service) BlockFeed

func (s *Service) BlockFeed() *event.Feed

BlockFeed returns a feed other services in slasher can subscribe to blocks received via the beacon node through gRPC.

func (*Service) ChainHead

func (s *Service) ChainHead(
	ctx context.Context,
) (*ethpb.ChainHead, error)

ChainHead requests the latest beacon chain head from a beacon node via gRPC.

func (*Service) ClientReadyFeed

func (s *Service) ClientReadyFeed() *event.Feed

ClientReadyFeed returns a feed other services in slasher can subscribe to to indicate when the gRPC connection is ready.

func (*Service) FindOrGetPublicKeys

func (s *Service) FindOrGetPublicKeys(
	ctx context.Context,
	validatorIndices []types.ValidatorIndex,
) (map[types.ValidatorIndex][]byte, error)

FindOrGetPublicKeys gets public keys from cache or request validators public keys from a beacon node via gRPC.

func (*Service) GenesisValidatorsRoot

func (s *Service) GenesisValidatorsRoot(
	ctx context.Context,
) ([]byte, error)

GenesisValidatorsRoot requests or fetch from memory the beacon chain genesis validators root via gRPC.

func (*Service) ReceiveAttestations

func (s *Service) ReceiveAttestations(ctx context.Context)

ReceiveAttestations starts a gRPC client stream listener to obtain attestations from the beacon node. Upon receiving an attestation, the service broadcasts it to a feed for other services in slasher to subscribe to.

func (*Service) ReceiveBlocks

func (s *Service) ReceiveBlocks(ctx context.Context)

ReceiveBlocks starts a gRPC client stream listener to obtain blocks from the beacon node. Upon receiving a block, the service broadcasts it to a feed for other services in slasher to subscribe to.

func (*Service) RequestHistoricalAttestations

func (s *Service) RequestHistoricalAttestations(
	ctx context.Context,
	epoch types.Epoch,
) ([]*ethpb.IndexedAttestation, error)

RequestHistoricalAttestations requests all indexed attestations for a given epoch from a beacon node via gRPC.

func (*Service) Start

func (s *Service) Start()

Start the main runtime of the beaconclient service, initializing a gRPC client connection with a beacon node, listening for streamed blocks/attestations, and submitting slashing operations after they are detected by other services in the slasher.

func (*Service) Status

func (s *Service) Status() error

Status returns an error if there exists a gRPC connection error in the service.

func (*Service) Stop

func (s *Service) Stop() error

Stop the beacon client service by closing the gRPC connection.