pex

Documentation

Index

• Constants
• func NewAddrBook(filePath string, routabilityStrict bool) *addrBook
• type AddrBook
• type PEXReactor
  • func NewPEXReactor(b AddrBook, config *PEXReactorConfig) *PEXReactor
  • func (r *PEXReactor) AddPeer(p Peer)
  • func (r *PEXReactor) AttemptsToDial(addr *p2p.NetAddress) int
  • func (r *PEXReactor) GetChannels() []*conn.ChannelDescriptor
  • func (r *PEXReactor) OnStart() error
  • func (r *PEXReactor) OnStop()
  • func (r *PEXReactor) Receive(chID byte, src Peer, msgBytes []byte)
  • func (r *PEXReactor) ReceiveAddrs(addrs []*p2p.NetAddress, src Peer) error
  • func (r *PEXReactor) RemovePeer(p Peer, reason interface{})
  • func (r *PEXReactor) RequestAddrs(p Peer)
  • func (r *PEXReactor) SendAddrs(p Peer, netAddrs []*p2p.NetAddress)
  • func (r *PEXReactor) SetEnsurePeersPeriod(d time.Duration)
• type PEXReactorConfig
• type Peer
• type PexMessage
  • func DecodeMessage(bz []byte) (msgType byte, msg PexMessage, err error)

Constants

const (
	// PexChannel is a channel for PEX messages
	PexChannel = byte(0x00)
)

Functions

func NewAddrBook

func NewAddrBook(filePath string, routabilityStrict bool) *addrBook

NewAddrBook creates a new address book. Use Start to begin processing asynchronous address updates.

Types

type AddrBook

type AddrBook interface {
	cmn.Service

	// Add our own addresses so we don't later add ourselves
	AddOurAddress(*p2p.NetAddress)
	// Check if it is our address
	OurAddress(*p2p.NetAddress) bool

	// Add and remove an address
	AddAddress(addr *p2p.NetAddress, src *p2p.NetAddress) error
	RemoveAddress(*p2p.NetAddress)

	// Check if the address is in the book
	HasAddress(*p2p.NetAddress) bool

	// Do we need more peers?
	NeedMoreAddrs() bool

	// Pick an address to dial
	PickAddress(biasTowardsNewAddrs int) *p2p.NetAddress

	// Mark address
	MarkGood(*p2p.NetAddress)
	MarkAttempt(*p2p.NetAddress)
	MarkBad(*p2p.NetAddress)

	IsGood(*p2p.NetAddress) bool

	// Send a selection of addresses to peers
	GetSelection() []*p2p.NetAddress
	// Send a selection of addresses with bias
	GetSelectionWithBias(biasTowardsNewAddrs int) []*p2p.NetAddress

	// TODO: remove
	ListOfKnownAddresses() []*knownAddress

	// Persist to disk
	Save()
}

AddrBook is an address book used for tracking peers so we can gossip about them to others and select peers to dial. TODO: break this up?

type PEXReactor

type PEXReactor struct {
	p2p.BaseReactor
	// contains filtered or unexported fields
}

PEXReactor handles PEX (peer exchange) and ensures that an adequate number of peers are connected to the switch.

It uses `AddrBook` (address book) to store `NetAddress`es of the peers.

## Preventing abuse

Only accept pexAddrsMsg from peers we sent a corresponding pexRequestMsg too. Only accept one pexRequestMsg every ~defaultEnsurePeersPeriod.

func NewPEXReactor

func NewPEXReactor(b AddrBook, config *PEXReactorConfig) *PEXReactor

NewPEXReactor creates new PEX reactor.

func (*PEXReactor) AddPeer

func (r *PEXReactor) AddPeer(p Peer)

AddPeer implements Reactor by adding peer to the address book (if inbound) or by requesting more addresses (if outbound).

func (*PEXReactor) AttemptsToDial

func (r *PEXReactor) AttemptsToDial(addr *p2p.NetAddress) int

AttemptsToDial returns the number of attempts to dial specific address. It returns 0 if never attempted or successfully connected.

func (*PEXReactor) GetChannels

func (r *PEXReactor) GetChannels() []*conn.ChannelDescriptor

GetChannels implements Reactor

func (*PEXReactor) OnStart

func (r *PEXReactor) OnStart() error

OnStart implements BaseService

func (*PEXReactor) OnStop

func (r *PEXReactor) OnStop()

OnStop implements BaseService

func (*PEXReactor) Receive

func (r *PEXReactor) Receive(chID byte, src Peer, msgBytes []byte)

Receive implements Reactor by handling incoming PEX messages.

func (*PEXReactor) ReceiveAddrs

func (r *PEXReactor) ReceiveAddrs(addrs []*p2p.NetAddress, src Peer) error

ReceiveAddrs adds the given addrs to the addrbook if theres an open request for this peer and deletes the open request. If there's no open request for the src peer, it returns an error.

func (*PEXReactor) RemovePeer

func (r *PEXReactor) RemovePeer(p Peer, reason interface{})

RemovePeer implements Reactor.

func (*PEXReactor) RequestAddrs

func (r *PEXReactor) RequestAddrs(p Peer)

RequestAddrs asks peer for more addresses if we do not already have a request out for this peer.

func (*PEXReactor) SendAddrs

func (r *PEXReactor) SendAddrs(p Peer, netAddrs []*p2p.NetAddress)

SendAddrs sends addrs to the peer.

func (*PEXReactor) SetEnsurePeersPeriod

func (r *PEXReactor) SetEnsurePeersPeriod(d time.Duration)

SetEnsurePeersPeriod sets period to ensure peers connected.

type PEXReactorConfig

type PEXReactorConfig struct {
	// Seed/Crawler mode
	SeedMode bool

	// Seeds is a list of addresses reactor may use
	// if it can't connect to peers in the addrbook.
	Seeds []string

	// PrivatePeerIDs is a list of peer IDs, which must not be gossiped to other
	// peers.
	PrivatePeerIDs []string
}

PEXReactorConfig holds reactor specific configuration data.

type Peer

type Peer = p2p.Peer

type PexMessage

type PexMessage interface{}

PexMessage is a primary type for PEX messages. Underneath, it could contain either pexRequestMessage, or pexAddrsMessage messages.

func DecodeMessage

func DecodeMessage(bz []byte) (msgType byte, msg PexMessage, err error)

DecodeMessage implements interface registered above.