peers

Documentation

Overview

Package peers provides information about peers at the eth2 protocol level.

"Protocol level" is the level above the network level, so this layer never sees or interacts with (for example) hosts that are uncontactable due to being down, firewalled, etc. Instead, this works with peers that are contactable but may or may not be of the correct fork version, not currently required due to the number of current connections, etc.

A peer can have one of a number of states:

- connected if we are able to talk to the remote peer - connecting if we are attempting to be able to talk to the remote peer - disconnecting if we are attempting to stop being able to talk to the remote peer - disconnected if we are not able to talk to the remote peer

For convenience, there are two aggregate states expressed in functions:

- active if we are connecting or connected - inactive if we are disconnecting or disconnected

Peer information is persistent for the run of the service. This allows for collection of useful long-term statistics such as number of bad responses obtained from the peer, giving the basis for decisions to not talk to known-bad peers (by de-scoring them).

Index

• Constants
• type Status
  • func NewStatus(ctx context.Context, config *StatusConfig) *Status
  • func (p *Status) Active() []peer.ID
  • func (p *Status) Add(record *enr.Record, pid peer.ID, address ma.Multiaddr, ...)
  • func (p *Status) Address(pid peer.ID) (ma.Multiaddr, error)
  • func (p *Status) All() []peer.ID
  • func (p *Status) Bad() []peer.ID
  • func (p *Status) BestFinalized(maxPeers int, ourFinalizedEpoch uint64) (uint64, []peer.ID)
  • func (p *Status) BestNonFinalized(minPeers int, ourHeadEpoch uint64) (uint64, []peer.ID)
  • func (p *Status) ChainState(pid peer.ID) (*pb.Status, error)
  • func (p *Status) ChainStateLastUpdated(pid peer.ID) (time.Time, error)
  • func (p *Status) CommitteeIndices(pid peer.ID) ([]uint64, error)
  • func (p *Status) Connected() []peer.ID
  • func (p *Status) Connecting() []peer.ID
  • func (p *Status) ConnectionState(pid peer.ID) (peerdata.PeerConnectionState, error)
  • func (p *Status) Direction(pid peer.ID) (network.Direction, error)
  • func (p *Status) Disconnected() []peer.ID
  • func (p *Status) Disconnecting() []peer.ID
  • func (p *Status) ENR(pid peer.ID) (*enr.Record, error)
  • func (p *Status) HighestEpoch() uint64
  • func (p *Status) Inactive() []peer.ID
  • func (p *Status) IsActive(pid peer.ID) bool
  • func (p *Status) IsBad(pid peer.ID) bool
  • func (p *Status) MaxPeerLimit() int
  • func (p *Status) Metadata(pid peer.ID) (*pb.MetaData, error)
  • func (p *Status) Prune()
  • func (p *Status) Scorers() *scorers.Service
  • func (p *Status) SetChainState(pid peer.ID, chainState *pb.Status)
  • func (p *Status) SetConnectionState(pid peer.ID, state peerdata.PeerConnectionState)
  • func (p *Status) SetMetadata(pid peer.ID, metaData *pb.MetaData)
  • func (p *Status) SubscribedToSubnet(index uint64) []peer.ID
• type StatusConfig

Constants

const (
	// PeerDisconnected means there is no connection to the peer.
	PeerDisconnected peerdata.PeerConnectionState = iota
	// PeerDisconnecting means there is an on-going attempt to disconnect from the peer.
	PeerDisconnecting
	// PeerConnected means the peer has an active connection.
	PeerConnected
	// PeerConnecting means there is an on-going attempt to connect to the peer.
	PeerConnecting
)

Types

type Status

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

Status is the structure holding the peer status information.

func NewStatus

func NewStatus(ctx context.Context, config *StatusConfig) *Status

NewStatus creates a new status entity.

func (*Status) Active

func (p *Status) Active() []peer.ID

Active returns the peers that are connecting or connected.

func (*Status) Add

func (p *Status) Add(record *enr.Record, pid peer.ID, address ma.Multiaddr, direction network.Direction)

Add adds a peer. If a peer already exists with this ID its address and direction are updated with the supplied data.

func (*Status) Address

func (p *Status) Address(pid peer.ID) (ma.Multiaddr, error)

Address returns the multiaddress of the given remote peer. This will error if the peer does not exist.

func (*Status) All

func (p *Status) All() []peer.ID

All returns all the peers regardless of state.

func (*Status) Bad

func (p *Status) Bad() []peer.ID

Bad returns the peers that are bad.

func (*Status) BestFinalized

func (p *Status) BestFinalized(maxPeers int, ourFinalizedEpoch uint64) (uint64, []peer.ID)

BestFinalized returns the highest finalized epoch equal to or higher than ours that is agreed upon by the majority of peers. This method may not return the absolute highest finalized, but the finalized epoch in which most peers can serve blocks (plurality voting). Ideally, all peers would be reporting the same finalized epoch but some may be behind due to their own latency, or because of their finalized epoch at the time we queried them. Returns epoch number and list of peers that are at or beyond that epoch.

func (*Status) BestNonFinalized

func (p *Status) BestNonFinalized(minPeers int, ourHeadEpoch uint64) (uint64, []peer.ID)

BestNonFinalized returns the highest known epoch, higher than ours, and is shared by at least minPeers.

func (*Status) ChainState

func (p *Status) ChainState(pid peer.ID) (*pb.Status, error)

ChainState gets the chain state of the given remote peer. This can return nil if there is no known chain state for the peer. This will error if the peer does not exist.

func (*Status) ChainStateLastUpdated

func (p *Status) ChainStateLastUpdated(pid peer.ID) (time.Time, error)

ChainStateLastUpdated gets the last time the chain state of the given remote peer was updated. This will error if the peer does not exist.

func (*Status) CommitteeIndices

func (p *Status) CommitteeIndices(pid peer.ID) ([]uint64, error)

CommitteeIndices retrieves the committee subnets the peer is subscribed to.

func (*Status) Connected

func (p *Status) Connected() []peer.ID

Connected returns the peers that are connected.

func (*Status) Connecting

func (p *Status) Connecting() []peer.ID

Connecting returns the peers that are connecting.

func (*Status) ConnectionState

func (p *Status) ConnectionState(pid peer.ID) (peerdata.PeerConnectionState, error)

ConnectionState gets the connection state of the given remote peer. This will error if the peer does not exist.

func (*Status) Direction

func (p *Status) Direction(pid peer.ID) (network.Direction, error)

Direction returns the direction of the given remote peer. This will error if the peer does not exist.

func (*Status) Disconnected

func (p *Status) Disconnected() []peer.ID

Disconnected returns the peers that are disconnected.

func (*Status) Disconnecting

func (p *Status) Disconnecting() []peer.ID

Disconnecting returns the peers that are disconnecting.

func (*Status) ENR

func (p *Status) ENR(pid peer.ID) (*enr.Record, error)

ENR returns the enr for the corresponding peer id.

func (*Status) HighestEpoch

func (p *Status) HighestEpoch() uint64

HighestEpoch returns the highest epoch reported epoch amongst peers.

func (*Status) Inactive

func (p *Status) Inactive() []peer.ID

Inactive returns the peers that are disconnecting or disconnected.

func (*Status) IsActive

func (p *Status) IsActive(pid peer.ID) bool

IsActive checks if a peers is active and returns the result appropriately.

func (*Status) IsBad

func (p *Status) IsBad(pid peer.ID) bool

IsBad states if the peer is to be considered bad. If the peer is unknown this will return `false`, which makes using this function easier than returning an error.

func (*Status) MaxPeerLimit

func (p *Status) MaxPeerLimit() int

MaxPeerLimit returns the max peer limit stored in the current peer store.

func (*Status) Metadata

func (p *Status) Metadata(pid peer.ID) (*pb.MetaData, error)

Metadata returns a copy of the metadata corresponding to the provided peer id.

func (*Status) Prune

func (p *Status) Prune()

Prune clears out and removes outdated and disconnected peers.

func (*Status) Scorers

func (p *Status) Scorers() *scorers.Service

Scorers exposes peer scoring management service.

func (*Status) SetChainState

func (p *Status) SetChainState(pid peer.ID, chainState *pb.Status)

SetChainState sets the chain state of the given remote peer.

func (*Status) SetConnectionState

func (p *Status) SetConnectionState(pid peer.ID, state peerdata.PeerConnectionState)

SetConnectionState sets the connection state of the given remote peer.

func (*Status) SetMetadata

func (p *Status) SetMetadata(pid peer.ID, metaData *pb.MetaData)

SetMetadata sets the metadata of the given remote peer.

func (*Status) SubscribedToSubnet

func (p *Status) SubscribedToSubnet(index uint64) []peer.ID

SubscribedToSubnet retrieves the peers subscribed to the given committee subnet.

type StatusConfig

type StatusConfig struct {
	// PeerLimit specifies maximum amount of concurrent peers that are expected to be connect to the node.
	PeerLimit int
	// ScorerParams holds peer scorer configuration params.
	ScorerParams *scorers.Config
}

StatusConfig represents peer status service params.