discover

Documentation

Index

• Constants
• func SetParameters(param Parameters)
• type DeletedEvent
• type DiscoveredEvent
• type Events
• type Option
  • func Logger(log *logger.Logger) Option
  • func MasterPeers(masterPeers []*peer.Peer) Option
• type Parameters
• type Protocol
  • func New(local *peer.Local, version uint32, networkID uint32, opts ...Option) *Protocol
  • func (p *Protocol) Close()
  • func (p *Protocol) DiscoveryRequest(to *peer.Peer) ([]*peer.Peer, error)
  • func (p *Protocol) EnsureVerified(peer *peer.Peer) error
  • func (p *Protocol) Events() Events
  • func (p *Protocol) GetMasterPeers() []*peer.Peer
  • func (p *Protocol) GetVerifiedPeer(id identity.ID) *peer.Peer
  • func (p *Protocol) GetVerifiedPeers() []*peer.Peer
  • func (p *Protocol) HandleMessage(s *server.Server, fromAddr *net.UDPAddr, from *identity.Identity, data []byte) (bool, error)
  • func (p *Protocol) IsVerified(id identity.ID, ip net.IP) bool
  • func (p *Protocol) Ping(to *peer.Peer) error
  • func (p *Protocol) Start(s server.Sender)

Constants

const (
	DefaultReverifyInterval = 10 * time.Second
	DefaultQueryInterval    = 60 * time.Second
	DefaultMaxManaged       = 1000
	DefaultMaxReplacements  = 10
)

Default values for the global parameters

const (
	// PingExpiration is the time until a peer verification expires.
	PingExpiration = 12 * time.Hour
	// MaxPeersInResponse is the maximum number of peers returned in DiscoveryResponse.
	MaxPeersInResponse = 6
	// MaxServices is the maximum number of services a peer can support.
	MaxServices = 5
)

Functions

func SetParameters

func SetParameters(param Parameters)

SetParameters sets the global parameters for this package. This function cannot be used concurrently.

Types

type DeletedEvent

type DeletedEvent struct {
	Peer *peer.Peer // deleted peer
}

DeletedEvent bundles the information of the deleted peer.

type DiscoveredEvent

type DiscoveredEvent struct {
	Peer *peer.Peer // discovered peer
}

DiscoveredEvent bundles the information of the discovered peer.

type Events

type Events struct {
	// A PeerDiscovered event is triggered, when a new peer has been discovered and verified.
	PeerDiscovered *events.Event
	// A PeerDeleted event is triggered, when a discovered and verified peer could not be re-verified.
	PeerDeleted *events.Event
}

Events contains all the events that are triggered during the peer discovery.

type Option

type Option interface {
	// contains filtered or unexported methods
}

Option modifies discovery related settings.

func Logger

func Logger(log *logger.Logger) Option

Logger sets the logger

func MasterPeers

func MasterPeers(masterPeers []*peer.Peer) Option

MasterPeers sets the masterPeers to use

type Parameters

type Parameters struct {
	ReverifyInterval time.Duration // time interval after which the next peer is reverified
	QueryInterval    time.Duration // time interval after which peers are queried for new peers
	MaxManaged       int           // maximum number of peers that can be managed
	MaxReplacements  int           // maximum number of peers kept in the replacement list
}

Parameters holds the parameters that can be configured.

type Protocol

type Protocol struct {
	server.Protocol
	// contains filtered or unexported fields
}

The Protocol handles the peer discovery. It responds to incoming messages and sends own requests when needed.

func New

func New(local *peer.Local, version uint32, networkID uint32, opts ...Option) *Protocol

New creates a new discovery protocol for the local node with the given protocol version and networkID.

func (*Protocol) Close

func (p *Protocol) Close()

Close finalizes the protocol.

func (*Protocol) DiscoveryRequest

func (p *Protocol) DiscoveryRequest(to *peer.Peer) ([]*peer.Peer, error)

DiscoveryRequest request known peers from the given target. This method blocks until a response is received and the provided peers are returned.

func (*Protocol) EnsureVerified

func (p *Protocol) EnsureVerified(peer *peer.Peer) error

EnsureVerified checks if the given peer has recently sent a Ping; if not, we send a Ping to trigger a verification.

func (*Protocol) Events

func (p *Protocol) Events() Events

Events returns all the events that are triggered during the peer discovery.

func (*Protocol) GetMasterPeers

func (p *Protocol) GetMasterPeers() []*peer.Peer

GetMasterPeers returns the list of master peers.

func (*Protocol) GetVerifiedPeer

func (p *Protocol) GetVerifiedPeer(id identity.ID) *peer.Peer

GetVerifiedPeer returns the verified peer with the given ID, or nil if no such peer exists.

func (*Protocol) GetVerifiedPeers

func (p *Protocol) GetVerifiedPeers() []*peer.Peer

GetVerifiedPeers returns all the currently managed peers that have been verified at least once.

func (*Protocol) HandleMessage

func (p *Protocol) HandleMessage(s *server.Server, fromAddr *net.UDPAddr, from *identity.Identity, data []byte) (bool, error)

HandleMessage responds to incoming peer discovery messages.

func (*Protocol) IsVerified

func (p *Protocol) IsVerified(id identity.ID, ip net.IP) bool

IsVerified checks whether the given peer has recently been verified a recent enough endpoint proof.

func (*Protocol) Ping

func (p *Protocol) Ping(to *peer.Peer) error

Ping sends a Ping to the specified peer and blocks until a reply is received or timeout.

func (*Protocol) Start

func (p *Protocol) Start(s server.Sender)

Start starts the actual peer discovery over the provided Sender.