blockchain

Documentation

Overview

Package blockchain defines the life-cycle and status of the beacon chain as well as the Ethereum Serenity beacon chain fork-choice rule based on Casper Proof of Stake finality.

Index

• Variables
• type AttestationReceiver
• type BlockReceiver
• type ChainInfoFetcher
• type Config
• type FinalizationFetcher
• type ForkFetcher
• type HeadFetcher
• type ParticipationFetcher
• type Service
  • func NewService(ctx context.Context, cfg *Config) (*Service, error)
  • func (s *Service) ClearCachedStates()
  • func (s *Service) CurrentFork() *pb.Fork
  • func (s *Service) CurrentJustifiedCheckpt() *ethpb.Checkpoint
  • func (s *Service) CurrentSlot() uint64
  • func (s *Service) FinalizedCheckpt() *ethpb.Checkpoint
  • func (s *Service) GenesisTime() time.Time
  • func (s *Service) HeadBlock(ctx context.Context) (*ethpb.SignedBeaconBlock, error)
  • func (s *Service) HeadRoot(ctx context.Context) ([]byte, error)
  • func (s *Service) HeadSeed(epoch uint64) ([32]byte, error)
  • func (s *Service) HeadSlot() uint64
  • func (s *Service) HeadState(ctx context.Context) (*state.BeaconState, error)
  • func (s *Service) HeadValidatorsIndices(epoch uint64) ([]uint64, error)
  • func (s *Service) IsValidAttestation(ctx context.Context, att *ethpb.Attestation) bool
  • func (s *Service) Participation(epoch uint64) *precompute.Balance
  • func (s *Service) PreviousJustifiedCheckpt() *ethpb.Checkpoint
  • func (s *Service) ReceiveAttestationNoPubsub(ctx context.Context, att *ethpb.Attestation) error
  • func (s *Service) ReceiveBlock(ctx context.Context, block *ethpb.SignedBeaconBlock) error
  • func (s *Service) ReceiveBlockNoPubsub(ctx context.Context, block *ethpb.SignedBeaconBlock) error
  • func (s *Service) ReceiveBlockNoPubsubForkchoice(ctx context.Context, block *ethpb.SignedBeaconBlock) error
  • func (s *Service) ReceiveBlockNoVerify(ctx context.Context, block *ethpb.SignedBeaconBlock) error
  • func (s *Service) Start()
  • func (s *Service) Status() error
  • func (s *Service) Stop() error
  • func (s *Service) TreeHandler(w http.ResponseWriter, _ *http.Request)
• type TimeFetcher

Variables

var ErrTargetRootNotInDB = errors.New("target root does not exist in db")

ErrTargetRootNotInDB returns when the target block root of an attestation cannot be found in the beacon database.

Types

type AttestationReceiver

type AttestationReceiver interface {
	ReceiveAttestationNoPubsub(ctx context.Context, att *ethpb.Attestation) error
	IsValidAttestation(ctx context.Context, att *ethpb.Attestation) bool
}

AttestationReceiver interface defines the methods of chain service receive and processing new attestations.

type BlockReceiver

type BlockReceiver interface {
	ReceiveBlock(ctx context.Context, block *ethpb.SignedBeaconBlock) error
	ReceiveBlockNoPubsub(ctx context.Context, block *ethpb.SignedBeaconBlock) error
	ReceiveBlockNoPubsubForkchoice(ctx context.Context, block *ethpb.SignedBeaconBlock) error
	ReceiveBlockNoVerify(ctx context.Context, block *ethpb.SignedBeaconBlock) error
}

BlockReceiver interface defines the methods of chain service receive and processing new blocks.

type ChainInfoFetcher

type ChainInfoFetcher interface {
	HeadFetcher
	FinalizationFetcher
}

ChainInfoFetcher defines a common interface for methods in blockchain service which directly retrieves chain info related data.

type Config

type Config struct {
	BeaconBlockBuf    int
	ChainStartFetcher powchain.ChainStartFetcher
	BeaconDB          db.HeadAccessDatabase
	DepositCache      *depositcache.DepositCache
	AttPool           attestations.Pool
	ExitPool          *voluntaryexits.Pool
	SlashingPool      *slashings.Pool
	P2p               p2p.Broadcaster
	MaxRoutines       int64
	StateNotifier     statefeed.Notifier
	ForkChoiceStore   f.ForkChoicer
}

Config options for the service.

type FinalizationFetcher

type FinalizationFetcher interface {
	FinalizedCheckpt() *ethpb.Checkpoint
	CurrentJustifiedCheckpt() *ethpb.Checkpoint
	PreviousJustifiedCheckpt() *ethpb.Checkpoint
}

FinalizationFetcher defines a common interface for methods in blockchain service which directly retrieves finalization and justification related data.

type ForkFetcher

type ForkFetcher interface {
	CurrentFork() *pb.Fork
}

ForkFetcher retrieves the current fork information of the Ethereum beacon chain.

type HeadFetcher

type HeadFetcher interface {
	HeadSlot() uint64
	HeadRoot(ctx context.Context) ([]byte, error)
	HeadBlock(ctx context.Context) (*ethpb.SignedBeaconBlock, error)
	HeadState(ctx context.Context) (*state.BeaconState, error)
	HeadValidatorsIndices(epoch uint64) ([]uint64, error)
	HeadSeed(epoch uint64) ([32]byte, error)
}

HeadFetcher defines a common interface for methods in blockchain service which directly retrieves head related data.

type ParticipationFetcher

type ParticipationFetcher interface {
	Participation(epoch uint64) *precompute.Balance
}

ParticipationFetcher defines a common interface for methods in blockchain service which directly retrieves validator participation related data.

type Service

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

Service represents a service that handles the internal logic of managing the full PoS beacon chain.

func NewService

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

NewService instantiates a new block service instance that will be registered into a running beacon node.

func (*Service) ClearCachedStates

func (s *Service) ClearCachedStates()

ClearCachedStates removes all stored caches states. This is done after the node is synced.

func (*Service) CurrentFork

func (s *Service) CurrentFork() *pb.Fork

CurrentFork retrieves the latest fork information of the beacon chain.

func (*Service) CurrentJustifiedCheckpt

func (s *Service) CurrentJustifiedCheckpt() *ethpb.Checkpoint

CurrentJustifiedCheckpt returns the current justified checkpoint from head state.

func (*Service) CurrentSlot

func (s *Service) CurrentSlot() uint64

CurrentSlot returns the current slot based on time.

func (*Service) FinalizedCheckpt

func (s *Service) FinalizedCheckpt() *ethpb.Checkpoint

FinalizedCheckpt returns the latest finalized checkpoint from head state.

func (*Service) GenesisTime

func (s *Service) GenesisTime() time.Time

GenesisTime returns the genesis time of beacon chain.

func (*Service) HeadBlock

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

HeadBlock returns the head block of the chain. If the head state is nil from service struct, it will attempt to get the head block from DB.

func (*Service) HeadRoot

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

HeadRoot returns the root of the head of the chain.

func (*Service) HeadSeed

func (s *Service) HeadSeed(epoch uint64) ([32]byte, error)

HeadSeed returns the seed from the head view of a given epoch.

func (*Service) HeadSlot

func (s *Service) HeadSlot() uint64

HeadSlot returns the slot of the head of the chain.

func (*Service) HeadState

func (s *Service) HeadState(ctx context.Context) (*state.BeaconState, error)

HeadState returns the head state of the chain. If the head state is nil from service struct, it will attempt to get the head state from DB.

func (*Service) HeadValidatorsIndices

func (s *Service) HeadValidatorsIndices(epoch uint64) ([]uint64, error)

HeadValidatorsIndices returns a list of active validator indices from the head view of a given epoch.

func (*Service) IsValidAttestation

func (s *Service) IsValidAttestation(ctx context.Context, att *ethpb.Attestation) bool

IsValidAttestation returns true if the attestation can be verified against its pre-state.

func (*Service) Participation

func (s *Service) Participation(epoch uint64) *precompute.Balance

Participation returns the participation stats of a given epoch.

func (*Service) PreviousJustifiedCheckpt

func (s *Service) PreviousJustifiedCheckpt() *ethpb.Checkpoint

PreviousJustifiedCheckpt returns the previous justified checkpoint from head state.

func (*Service) ReceiveAttestationNoPubsub

func (s *Service) ReceiveAttestationNoPubsub(ctx context.Context, att *ethpb.Attestation) error

ReceiveAttestationNoPubsub is a function that defines the operations that are preformed on attestation that is received from regular sync. The operations consist of:

1. Validate attestation, update validator's latest vote
2. Apply fork choice to the processed attestation
3. Save latest head info

func (*Service) ReceiveBlock

func (s *Service) ReceiveBlock(ctx context.Context, block *ethpb.SignedBeaconBlock) error

ReceiveBlock is a function that defines the operations that are preformed on blocks that is received from rpc service. The operations consists of:

1. Gossip block to other peers
2. Validate block, apply state transition and update check points
3. Apply fork choice to the processed block
4. Save latest head info

func (*Service) ReceiveBlockNoPubsub

func (s *Service) ReceiveBlockNoPubsub(ctx context.Context, block *ethpb.SignedBeaconBlock) error

ReceiveBlockNoPubsub is a function that defines the the operations (minus pubsub) that are preformed on blocks that is received from regular sync service. The operations consists of:

1. Validate block, apply state transition and update check points
2. Apply fork choice to the processed block
3. Save latest head info

func (*Service) ReceiveBlockNoPubsubForkchoice

func (s *Service) ReceiveBlockNoPubsubForkchoice(ctx context.Context, block *ethpb.SignedBeaconBlock) error

ReceiveBlockNoPubsubForkchoice is a function that defines the all operations (minus pubsub and forkchoice) that are preformed blocks that is received from initial sync service. The operations consists of:

1. Validate block, apply state transition and update check points
2. Save latest head info

func (*Service) ReceiveBlockNoVerify

func (s *Service) ReceiveBlockNoVerify(ctx context.Context, block *ethpb.SignedBeaconBlock) error

ReceiveBlockNoVerify runs state transition on a input block without verifying the block's BLS contents. Depends on the security model, this is the "minimal" work a node can do to sync the chain. It simulates light client behavior and assumes 100% trust with the syncing peer.

func (*Service) Start

func (s *Service) Start()

Start a blockchain service's main event loop.

func (*Service) Status

func (s *Service) Status() error

Status always returns nil unless there is an error condition that causes this service to be unhealthy.

func (*Service) Stop

func (s *Service) Stop() error

Stop the blockchain service's main event loop and associated goroutines.

func (*Service) TreeHandler

func (s *Service) TreeHandler(w http.ResponseWriter, _ *http.Request)

TreeHandler is a handler to serve /tree page in metrics.

type TimeFetcher

type TimeFetcher interface {
	GenesisTime() time.Time
	CurrentSlot() uint64
}

TimeFetcher retrieves the Eth2 data that's related to time.