hare

package
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 Go to latest Published: Jan 12, 2022 License: MIT Imports: 26 Imported by: 0

Documentation

Overview

Package hare implements the Hare Protocol.

Index

Constants

View Source 
const LayerBuffer = 20

LayerBuffer is the number of layer results we keep at a given time.

View Source 
const (
	// RoundsPerIteration is the number of rounds per iteration in the hare protocol.
	RoundsPerIteration = 4
)
View Source 
const Wakeup = math.MaxUint32 - 1 // -2

Wakeup has a value of -2 because it occurs exactly two round durations before the end of round 0. This accounts for the duration of round zero and the preround.

Variables

View Source 
var ErrTooLate = errors.New("consensus process finished too late")

ErrTooLate means that the consensus was terminated too late.

Functions

This section is empty.

Types

type Broker 

type Broker struct {
	util.Closer
	log.Log
	// contains filtered or unexported fields
}

Broker is the dispatcher of incoming Hare messages. The broker validates that the sender is eligible and active and forwards the message to the corresponding outbox.

func (*Broker) Close added in v1.0.0 

func (b *Broker) Close()

Close closes broker.

func (*Broker) CloseChannel 

func (b *Broker) CloseChannel() chan struct{}

CloseChannel returns the channel to wait on for close signal.

func (*Broker) HandleMessage added in v1.0.0 

func (b *Broker) HandleMessage(ctx context.Context, pid peer.ID, msg []byte) pubsub.ValidationResult

HandleMessage separate listener routine that receives gossip messages and adds them to the priority queue.

func (*Broker) Register 

func (b *Broker) Register(ctx context.Context, id types.LayerID) (chan *Msg, error)

Register a layer to receive messages Note: the registering instance is assumed to be started and accepting messages.

func (*Broker) Start 

func (b *Broker) Start(ctx context.Context) error

Start listening to Hare messages (non-blocking).

func (*Broker) Synced added in v0.1.2 

func (b *Broker) Synced(ctx context.Context, id types.LayerID) bool

Synced returns true if the given layer is synced, false otherwise.

func (*Broker) Unregister 

func (b *Broker) Unregister(ctx context.Context, id types.LayerID)

Unregister a layer from receiving messages.

type CertificationOutput 

type CertificationOutput = types.LayerID

CertificationOutput represents an certification output of a consensus process.

type Consensus 

type Consensus interface {
	ID() types.LayerID
	Close()
	CloseChannel() chan struct{}

	Start(ctx context.Context) error
	SetInbox(chan *Msg)
}

Consensus represents an item that acts like a consensus process.

type Hare 

type Hare struct {
	util.Closer
	log.Log
	// contains filtered or unexported fields
}

Hare is the orchestrator that starts new consensus processes and collects their output.

func New 

func New(
	conf config.Config,
	pid peer.ID,
	publisher pubsub.PublishSubsciber,
	sign Signer,
	nid types.NodeID,
	blockGen blockGenerator,
	syncState system.SyncStateProvider,
	mesh meshProvider,
	ppp proposalProvider,
	beacons system.BeaconGetter,
	fetch system.ProposalFetcher,
	rolacle Rolacle,
	patrol layerPatrol,
	layersPerEpoch uint16,
	idProvider identityProvider,
	stateQ stateQuerier,
	layerClock LayerClock,
	logger log.Log,
) *Hare

New returns a new Hare struct.

func (*Hare) Start 

func (h *Hare) Start(ctx context.Context) error

Start starts listening for layers and outputs.

type LayerClock added in v1.0.0 

type LayerClock interface {
	LayerToTime(id types.LayerID) time.Time
	AwaitLayer(layerID types.LayerID) chan struct{}
	GetCurrentLayer() types.LayerID
}

LayerClock provides a timer for the start of a given layer, as well as the current layer and allows converting a layer number to a clock time.

type Message 

type Message struct {
	Sig      []byte
	InnerMsg *innerMessage
}

Message is the tuple of a message and its corresponding signature.

func MessageFromBuffer 

func MessageFromBuffer(buf []byte) (*Message, error)

MessageFromBuffer builds an Hare message from the provided bytes buffer. It returns an error if unmarshal of the provided byte slice failed.

func (*Message) Field added in v0.1.27 

func (m *Message) Field() log.Field

Field returns a log field. Implements the LoggableField interface.

func (*Message) String 

func (m *Message) String() string

type Msg 

type Msg struct {
	*Message
	PubKey    *signing.PublicKey
	RequestID string
}

Msg is the wrapper of the protocol's message. Messages are sent as type Message. Upon receiving, the public key is added to this wrapper (public key extraction).

func (*Msg) Bytes 

func (m *Msg) Bytes() []byte

Bytes returns the message as bytes (without the public key). It panics if the message erred on unmarshal.

func (*Msg) String 

func (m *Msg) String() string

type RefCountTracker 

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

RefCountTracker tracks the number of references of any object id.

func NewRefCountTracker 

func NewRefCountTracker() *RefCountTracker

NewRefCountTracker creates a new reference count tracker.

func (*RefCountTracker) CountStatus 

func (tracker *RefCountTracker) CountStatus(id interface{}) uint32

CountStatus returns the number of references to the given id.

func (*RefCountTracker) String 

func (tracker *RefCountTracker) String() string

func (*RefCountTracker) Track 

func (tracker *RefCountTracker) Track(id interface{}, count uint32)

Track increases the count for the given object id.

type Rolacle 

type Rolacle interface {
	Validate(context.Context, types.LayerID, uint32, int, types.NodeID, []byte, uint16) (bool, error)
	CalcEligibility(context.Context, types.LayerID, uint32, int, types.NodeID, []byte) (uint16, error)
	Proof(context.Context, types.LayerID, uint32) ([]byte, error)
	IsIdentityActiveOnConsensusView(context.Context, string, types.LayerID) (bool, error)
}

Rolacle is the roles oracle provider.

type RoundClock added in v1.0.0 

type RoundClock interface {
	AwaitWakeup() <-chan struct{}
	AwaitEndOfRound(round uint32) <-chan struct{}
}

RoundClock is a timer interface.

type Set 

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

Set represents a unique set of values.

func NewDefaultEmptySet 

func NewDefaultEmptySet() *Set

NewDefaultEmptySet creates an empty set with the default size.

func NewEmptySet 

func NewEmptySet(size int) *Set

NewEmptySet creates an empty set with the provided size.

func NewSet 

func NewSet(data []types.ProposalID) *Set

NewSet creates a set from the provided array of values. Note: duplicated values are ignored.

func NewSetFromValues 

func NewSetFromValues(values ...types.ProposalID) *Set

NewSetFromValues creates a set of the provided values. Note: duplicated values are ignored.

func (*Set) Add 

func (s *Set) Add(id types.ProposalID)

Add a value to the set. It has no effect if the value already exists in the set.

func (*Set) Clone 

func (s *Set) Clone() *Set

Clone creates a copy of the set.

func (*Set) Complement 

func (s *Set) Complement(u *Set) *Set

Complement returns a new set that represents the complement of s relatively to the world u.

func (*Set) Contains 

func (s *Set) Contains(id types.ProposalID) bool

Contains returns true if the provided value is contained in the set, false otherwise.

func (*Set) Equals 

func (s *Set) Equals(g *Set) bool

Equals returns true if the provided set represents this set, false otherwise.

func (*Set) ID added in v0.1.11 

func (s *Set) ID() uint32

ID returns the ObjectID of the set.

func (*Set) Intersection 

func (s *Set) Intersection(g *Set) *Set

Intersection returns the intersection a new set which represents the intersection of s and g.

func (*Set) IsSubSetOf 

func (s *Set) IsSubSetOf(g *Set) bool

IsSubSetOf returns true if s is a subset of g, false otherwise.

func (*Set) Remove 

func (s *Set) Remove(id types.ProposalID)

Remove a value from the set. It has no effect if the value doesn't exist in the set.

func (*Set) Size 

func (s *Set) Size() int

Size returns the number of elements in the set.

func (*Set) String 

func (s *Set) String() string

func (*Set) Subtract 

func (s *Set) Subtract(g *Set)

Subtract g from s.

func (*Set) ToSlice 

func (s *Set) ToSlice() []types.ProposalID

ToSlice returns the array representation of the set.

func (*Set) Union 

func (s *Set) Union(g *Set) *Set

Union returns a new set which represents the union set of s and g.

type Signer 

type Signer interface {
	Sign(m []byte) []byte
	PublicKey() *signing.PublicKey
}

Signer provides signing and public-key getter.

type SimpleRoundClock added in v1.0.0 

type SimpleRoundClock struct {
	LayerTime     time.Time
	WakeupDelta   time.Duration
	RoundDuration time.Duration
}

SimpleRoundClock is a simple Hare-round clock. Repeated calls to AwaitEndOfRound() will each return a new channel and will be backed by a new timer which will not be garbage collected until it expires. To avoid leaking resources, callers should avoid calling AwaitEndOfRound() more than once for a given round (e.g. by storing the resulting channel and reusing it).

func NewSimpleRoundClock added in v1.0.0 

func NewSimpleRoundClock(layerTime time.Time, wakeupDelta, roundDuration time.Duration) *SimpleRoundClock

NewSimpleRoundClock returns a new SimpleRoundClock, given the provided configuration.

func (*SimpleRoundClock) AwaitEndOfRound added in v1.0.0 

func (c *SimpleRoundClock) AwaitEndOfRound(round uint32) <-chan struct{}

AwaitEndOfRound returns a channel that gets closed when the given round ends. Repeated calls to this method will return new instances of the channel and use new underlying timers which will not be garbage collected until they expire. To avoid leaking resources, callers should avoid calling AwaitEndOfRound() more than once for a given round (e.g. by storing the resulting channel and reusing it).

func (*SimpleRoundClock) AwaitWakeup added in v1.0.0 

func (c *SimpleRoundClock) AwaitWakeup() <-chan struct{}

AwaitWakeup returns a channel that gets closed when the Hare wakeup delay has passed.

type State 

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

State holds the current state of the consensus process (aka the participant).

type TerminationOutput 

type TerminationOutput interface {
	ID() types.LayerID
	Set() *Set
	Coinflip() bool
	Completed() bool
}

TerminationOutput represents an output of a consensus process.

Source Files

View all Source files

Directories

Path Synopsis
config
mocks
Package mocks is a generated GoMock package.
 Package mocks is a generated GoMock package.
Package mocks is a generated GoMock package.
 Package mocks is a generated GoMock package.

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