consensus

Documentation

Index

• func NewFollower(log zerolog.Logger, mempoolMetrics module.MempoolMetrics, ...) (*hotstuff.FollowerLoop, error)
• func NewForks(final *flow.Header, headers storage.Headers, updater module.Finalizer, ...) (*forks.Forks, error)
• func NewParticipant(log zerolog.Logger, metrics module.HotstuffMetrics, ...) (*eventloop.EventLoop, error)
• func NewTimeoutAggregator(log zerolog.Logger, hotstuffMetrics module.HotstuffMetrics, ...) (hotstuff.TimeoutAggregator, error)
• func NewValidator(metrics module.HotstuffMetrics, committee hotstuff.DynamicCommittee) hotstuff.Validator
• func NewVoteAggregator(log zerolog.Logger, hotstuffMetrics module.HotstuffMetrics, ...) (hotstuff.VoteAggregator, error)
• type HotstuffModules
• type Option
  • func WithHappyPathMaxRoundFailures(happyPathMaxRoundFailures uint64) Option
  • func WithMinTimeout(timeout time.Duration) Option
  • func WithProposalDurationProvider(provider hotstuff.ProposalDurationProvider) Option
  • func WithStartupTime(time time.Time) Option
  • func WithStaticProposalDuration(dur time.Duration) Option
  • func WithTimeoutAdjustmentFactor(factor float64) Option
• type ParticipantConfig
  • func DefaultParticipantConfig() ParticipantConfig

Functions

func NewFollower

func NewFollower(log zerolog.Logger,
	mempoolMetrics module.MempoolMetrics,
	headers storage.Headers,
	updater module.Finalizer,
	notifier hotstuff.FollowerConsumer,
	rootHeader *flow.Header,
	rootQC *flow.QuorumCertificate,
	finalized *flow.Header,
	pending []*flow.Header,
) (*hotstuff.FollowerLoop, error)

NewFollower instantiates the consensus follower and recovers its in-memory state of pending blocks. It receives the list `pending` containing _all_ blocks that

• have passed the compliance layer and stored in the protocol state
• descend from the latest finalized block
• are listed in ancestor-first order (i.e. for any block B ∈ pending, B's parent must be listed before B, unless B's parent is the latest finalized block)

CAUTION: all pending blocks are required to be valid (guaranteed if the block passed the compliance layer)

func NewForks

func NewForks(final *flow.Header, headers storage.Headers, updater module.Finalizer, notifier hotstuff.FollowerConsumer, rootHeader *flow.Header, rootQC *flow.QuorumCertificate) (*forks.Forks, error)

NewForks recovers trusted root and creates new forks manager

func NewParticipant

func NewParticipant(
	log zerolog.Logger,
	metrics module.HotstuffMetrics,
	mempoolMetrics module.MempoolMetrics,
	builder module.Builder,
	finalized *flow.Header,
	pending []*flow.Header,
	modules *HotstuffModules,
	options ...Option,
) (*eventloop.EventLoop, error)

NewParticipant initialize the EventLoop instance with needed dependencies

func NewTimeoutAggregator

func NewTimeoutAggregator(log zerolog.Logger,
	hotstuffMetrics module.HotstuffMetrics,
	engineMetrics module.EngineMetrics,
	mempoolMetrics module.MempoolMetrics,
	notifier *pubsub.Distributor,
	timeoutProcessorFactory hotstuff.TimeoutProcessorFactory,
	distributor *pubsub.TimeoutAggregationDistributor,
	lowestRetainedView uint64,
) (hotstuff.TimeoutAggregator, error)

NewTimeoutAggregator creates new TimeoutAggregator and connects Hotstuff event source with event handler. No error returns are expected during normal operations.

func NewValidator

func NewValidator(metrics module.HotstuffMetrics, committee hotstuff.DynamicCommittee) hotstuff.Validator

NewValidator creates new instance of hotstuff validator needed for votes & proposal validation

func NewVoteAggregator

func NewVoteAggregator(
	log zerolog.Logger,
	hotstuffMetrics module.HotstuffMetrics,
	engineMetrics module.EngineMetrics,
	mempoolMetrics module.MempoolMetrics,
	lowestRetainedView uint64,
	notifier hotstuff.VoteAggregationConsumer,
	voteProcessorFactory hotstuff.VoteProcessorFactory,
	distributor *pubsub.FollowerDistributor,
) (hotstuff.VoteAggregator, error)

NewVoteAggregator creates new VoteAggregator and subscribes for finalization events. No error returns are expected during normal operations.

Types

type HotstuffModules

type HotstuffModules struct {
	Committee                   hotstuff.DynamicCommittee           // consensus committee
	Signer                      hotstuff.Signer                     // signer of proposal & votes
	Persist                     hotstuff.Persister                  // last state of consensus participant
	Notifier                    *pubsub.Distributor                 // observer for hotstuff events
	VoteCollectorDistributor    *pubsub.VoteCollectorDistributor    // observer for vote aggregation events, used by leader
	TimeoutCollectorDistributor *pubsub.TimeoutCollectorDistributor // observer for timeout aggregation events
	Forks                       hotstuff.Forks                      // information about multiple forks
	Validator                   hotstuff.Validator                  // validator of proposals & votes
	VoteAggregator              hotstuff.VoteAggregator             // aggregator of votes, used by leader
	TimeoutAggregator           hotstuff.TimeoutAggregator          // aggregator of `TimeoutObject`s, used by every replica
}

HotstuffModules is a helper structure to encapsulate dependencies to create a hotStuff participant.

type Option

type Option func(*ParticipantConfig)

func WithHappyPathMaxRoundFailures

func WithHappyPathMaxRoundFailures(happyPathMaxRoundFailures uint64) Option

func WithMinTimeout

func WithMinTimeout(timeout time.Duration) Option

func WithProposalDurationProvider

func WithProposalDurationProvider(provider hotstuff.ProposalDurationProvider) Option

func WithStartupTime

func WithStartupTime(time time.Time) Option

func WithStaticProposalDuration

func WithStaticProposalDuration(dur time.Duration) Option

func WithTimeoutAdjustmentFactor

func WithTimeoutAdjustmentFactor(factor float64) Option

type ParticipantConfig

type ParticipantConfig struct {
	StartupTime                         time.Time                         // the time when consensus participant enters first view
	TimeoutMinimum                      time.Duration                     // the minimum timeout for the pacemaker
	TimeoutMaximum                      time.Duration                     // the maximum timeout for the pacemaker
	TimeoutAdjustmentFactor             float64                           // the factor at which the timeout duration is adjusted
	HappyPathMaxRoundFailures           uint64                            // number of failed rounds before first timeout increase
	MaxTimeoutObjectRebroadcastInterval time.Duration                     // maximum interval for timeout object rebroadcast
	ProposalDurationProvider            hotstuff.ProposalDurationProvider // a delay to broadcast block proposal in order to control the block production rate
}

func DefaultParticipantConfig

func DefaultParticipantConfig() ParticipantConfig