peer

package
v1.0.0-alpha Latest Latest
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 Go to latest Published: May 26, 2024 License: BSD-3-Clause Imports: 42 Imported by: 0

Documentation

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

func NoPrecondition 

func NoPrecondition(Peer) bool

func TLSConfig 

func TLSConfig(cert tls.Certificate, keyLogWriter io.Writer) *tls.Config

TLSConfig returns the TLS config that will allow secure connections to other peers.

It is safe, and typically expected, for [keyLogWriter] to be [nil]. [keyLogWriter] should only be enabled for debugging.

Types

type Config 

type Config struct {
	// Size, in bytes, of the buffer this peer reads messages into
	ReadBufferSize int
	// Size, in bytes, of the buffer this peer writes messages into
	WriteBufferSize int
	Clock           mockable.Clock
	Metrics         *Metrics
	MessageCreator  message.Creator

	Log                  logging.Logger
	InboundMsgThrottler  throttling.InboundMsgThrottler
	Network              Network
	Router               router.InboundHandler
	VersionCompatibility version.Compatibility
	// MySubnets does not include the primary network ID
	MySubnets          set.Set[ids.ID]
	Beacons            validators.Manager
	Validators         validators.Manager
	NetworkID          uint32
	PingFrequency      time.Duration
	PongTimeout        time.Duration
	MaxClockDifference time.Duration

	SupportedACPs []uint32
	ObjectedACPs  []uint32

	// Unix time of the last message sent and received respectively
	// Must only be accessed atomically
	LastSent, LastReceived int64

	// Tracks CPU/disk usage caused by each peer.
	ResourceTracker tracker.ResourceTracker

	// Calculates uptime of peers
	UptimeCalculator uptime.Calculator

	// Signs my IP so I can send my signed IP address in the Handshake message
	IPSigner *IPSigner
}

type IPSigner 

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

IPSigner will return a signedIP for the current value of our dynamic IP.

func NewIPSigner 

func NewIPSigner(
	ip ips.DynamicIPPort,
	tlsSigner crypto.Signer,
	blsSigner *bls.SecretKey,
) *IPSigner

func (*IPSigner) GetSignedIP 

func (s *IPSigner) GetSignedIP() (*SignedIP, error)

GetSignedIP returns the signedIP of the current value of the provided dynamicIP. If the dynamicIP hasn't changed since the prior call to GetSignedIP, then the same SignedIP will be returned.

It's safe for multiple goroutines to concurrently call GetSignedIP.

type Info 

type Info struct {
	IP                    string                 `json:"ip"`
	PublicIP              string                 `json:"publicIP,omitempty"`
	ID                    ids.NodeID             `json:"nodeID"`
	Version               string                 `json:"version"`
	LastSent              time.Time              `json:"lastSent"`
	LastReceived          time.Time              `json:"lastReceived"`
	ObservedUptime        json.Uint32            `json:"observedUptime"`
	ObservedSubnetUptimes map[ids.ID]json.Uint32 `json:"observedSubnetUptimes"`
	TrackedSubnets        set.Set[ids.ID]        `json:"trackedSubnets"`
	SupportedACPs         set.Set[uint32]        `json:"supportedACPs"`
	ObjectedACPs          set.Set[uint32]        `json:"objectedACPs"`
}

type MessageQueue 

type MessageQueue interface {
	// Push attempts to add the message to the queue. If the context is
	// canceled, then pushing the message will return `false` and the message
	// will not be added to the queue.
	Push(ctx context.Context, msg message.OutboundMessage) bool

	// Pop blocks until a message is available and then returns the message. If
	// the queue is closed, then `false` is returned.
	Pop() (message.OutboundMessage, bool)

	// PopNow attempts to return a message without blocking. If a message is not
	// available or the queue is closed, then `false` is returned.
	PopNow() (message.OutboundMessage, bool)

	// Close empties the queue and prevents further messages from being pushed
	// onto it. After calling close once, future calls to close will do nothing.
	Close()
}

func NewBlockingMessageQueue 

func NewBlockingMessageQueue(
	onFailed SendFailedCallback,
	log logging.Logger,
	bufferSize int,
) MessageQueue

func NewThrottledMessageQueue 

func NewThrottledMessageQueue(
	onFailed SendFailedCallback,
	id ids.NodeID,
	log logging.Logger,
	outboundMsgThrottler throttling.OutboundMsgThrottler,
) MessageQueue

type Metrics 

type Metrics struct {
	ClockSkewCount prometheus.Counter
	ClockSkewSum   prometheus.Gauge

	NumFailedToParse prometheus.Counter
	NumSendFailed    *prometheus.CounterVec // op

	Messages   *prometheus.CounterVec // io + op + compressed
	Bytes      *prometheus.CounterVec // io + op
	BytesSaved *prometheus.GaugeVec   // io + op
}

func NewMetrics 

func NewMetrics(
	namespace string,
	registerer prometheus.Registerer,
) (*Metrics, error)

func (*Metrics) MultipleSendsFailed 

func (m *Metrics) MultipleSendsFailed(op message.Op, count int)

func (*Metrics) Received 

func (m *Metrics) Received(msg message.InboundMessage, msgLen uint32)

func (*Metrics) SendFailed 

func (m *Metrics) SendFailed(msg message.OutboundMessage)

SendFailed updates the metrics for having failed to send [msg].

func (*Metrics) Sent 

func (m *Metrics) Sent(msg message.OutboundMessage)

Sent updates the metrics for having sent [msg].

type Network 

type Network interface {
	// Connected is called by the peer once the handshake is finished.
	Connected(peerID ids.NodeID)

	// AllowConnection enables the network is signal to the peer that its
	// connection is no longer desired and should be terminated.
	AllowConnection(peerID ids.NodeID) bool

	// Track allows the peer to notify the network of potential new peers to
	// connect to.
	Track(ips []*ips.ClaimedIPPort) error

	// Disconnected is called when the peer finishes shutting down. It is not
	// guaranteed that [Connected] was called for the provided peer. However, it
	// is guaranteed that [Connected] will not be called after [Disconnected]
	// for a given [Peer] object.
	Disconnected(peerID ids.NodeID)

	// KnownPeers returns the bloom filter of the known peers.
	KnownPeers() (bloomFilter []byte, salt []byte)

	// Peers returns peers that are not known.
	Peers(
		peerID ids.NodeID,
		knownPeers *bloom.ReadFilter,
		peerSalt []byte,
	) []*ips.ClaimedIPPort
}

Network defines the interface that is used by a peer to help establish a well connected p2p network. 

var TestNetwork Network = testNetwork{}

type Peer 

type Peer interface {
	// ID returns the nodeID of the remote peer.
	ID() ids.NodeID

	// Cert returns the certificate that the remote peer is using to
	// authenticate their messages.
	Cert() *staking.Certificate

	// LastSent returns the last time a message was sent to the peer.
	LastSent() time.Time

	// LastReceived returns the last time a message was received from the peer.
	LastReceived() time.Time

	// Ready returns true if the peer has finished the p2p handshake and is
	// ready to send and receive messages.
	Ready() bool

	// AwaitReady will block until the peer has finished the p2p handshake. If
	// the context is cancelled or the peer starts closing, then an error will
	// be returned.
	AwaitReady(ctx context.Context) error

	// Info returns a description of the state of this peer. It should only be
	// called after [Ready] returns true.
	Info() Info

	// IP returns the claimed IP and signature provided by this peer during the
	// handshake. It should only be called after [Ready] returns true.
	IP() *SignedIP

	// Version returns the claimed node version this peer is running. It should
	// only be called after [Ready] returns true.
	Version() *version.Application

	// TrackedSubnets returns the subnets this peer is running. It should only
	// be called after [Ready] returns true.
	TrackedSubnets() set.Set[ids.ID]

	// ObservedUptime returns the local node's subnet uptime according to the
	// peer. The value ranges from [0, 100]. It should only be called after
	// [Ready] returns true.
	ObservedUptime(subnetID ids.ID) (uint32, bool)

	// Send attempts to send [msg] to the peer. The peer takes ownership of
	// [msg] for reference counting. This returns false if the message is
	// guaranteed not to be delivered to the peer.
	Send(ctx context.Context, msg message.OutboundMessage) bool

	// StartSendGetPeerList attempts to send a GetPeerList message to this peer
	// on this peer's gossip routine. It is not guaranteed that a GetPeerList
	// will be sent.
	StartSendGetPeerList()

	// StartClose will begin shutting down the peer. It will not block.
	StartClose()

	// Closed returns true once the peer has been fully shutdown. It is
	// guaranteed that no more messages will be received by this peer once this
	// returns true.
	Closed() bool

	// AwaitClosed will block until the peer has been fully shutdown. If the
	// context is cancelled, then an error will be returned.
	AwaitClosed(ctx context.Context) error
}

Peer encapsulates all of the functionality required to send and receive messages with a remote peer.

func Start 

func Start(
	config *Config,
	conn net.Conn,
	cert *staking.Certificate,
	id ids.NodeID,
	messageQueue MessageQueue,
) Peer

Start a new peer instance.

Invariant: There must only be one peer running at a time with a reference to the same [config.InboundMsgThrottler].

func StartTestPeer 

func StartTestPeer(
	ctx context.Context,
	ip ips.IPPort,
	networkID uint32,
	router router.InboundHandler,
) (Peer, error)

StartTestPeer provides a simple interface to create a peer that has finished the p2p handshake.

This function will generate a new TLS key to use when connecting to the peer.

The returned peer will not throttle inbound or outbound messages.

  • [ctx] provides a way of canceling the connection request.
  • [ip] is the remote that will be dialed to create the connection.
  • [networkID] will be sent to the peer during the handshake. If the peer is expecting a different [networkID], the handshake will fail and an error will be returned.
  • router will be called with all non-handshake messages received by the peer.
Example 
ctx := context.Background()
ctx, cancel := context.WithTimeout(ctx, 15*time.Second)
defer cancel()

peerIP := ips.IPPort{
	IP:   net.IPv6loopback,
	Port: 9651,
}
peer, err := StartTestPeer(
	ctx,
	peerIP,
	constants.LocalID,
	router.InboundHandlerFunc(func(_ context.Context, msg message.InboundMessage) {
		fmt.Printf("handling %s\n", msg.Op())
	}),
)
if err != nil {
	panic(err)
}

// Send messages here with [peer.Send].

peer.StartClose()
err = peer.AwaitClosed(ctx)
if err != nil {
	panic(err)
}

Output:

type SendFailedCallback 

type SendFailedCallback interface {
	SendFailed(message.OutboundMessage)
}

type SendFailedFunc 

type SendFailedFunc func(message.OutboundMessage)

func (SendFailedFunc) SendFailed 

func (f SendFailedFunc) SendFailed(msg message.OutboundMessage)

type Set 

type Set interface {
	// Add this peer to the set.
	//
	// If a peer with the same [peer.ID] is already in the set, then the new
	// peer instance will replace the old peer instance.
	//
	// Add does not change the [peer.ID] returned from calls to [GetByIndex].
	Add(peer Peer)

	// GetByID attempts to fetch a [peer] whose [peer.ID] is equal to [nodeID].
	// If no such peer exists in the set, then [false] will be returned.
	GetByID(nodeID ids.NodeID) (Peer, bool)

	// GetByIndex attempts to fetch a peer who has been allocated [index]. If
	// [index] < 0 or [index] >= [Len], then false will be returned.
	GetByIndex(index int) (Peer, bool)

	// Remove any [peer] whose [peer.ID] is equal to [nodeID] from the set.
	Remove(nodeID ids.NodeID)

	// Len returns the number of peers currently in this set.
	Len() int

	// Sample attempts to return a random slice of peers with length [n]. The
	// slice will not include any duplicates. Only peers that cause the
	// [precondition] to return true will be returned in the slice.
	Sample(n int, precondition func(Peer) bool) []Peer

	// Returns information about all the peers.
	AllInfo() []Info

	// Info returns information about the requested peers if they are in the
	// set.
	Info(nodeIDs []ids.NodeID) []Info
}

Set contains a group of peers.

func NewSet 

func NewSet() Set

NewSet returns a set that does not internally manage synchronization.

Only [Add] and [Remove] require exclusion on the data structure. The remaining methods are safe for concurrent use.

type SignedIP 

type SignedIP struct {
	UnsignedIP
	TLSSignature      []byte
	BLSSignature      *bls.Signature
	BLSSignatureBytes []byte
}

SignedIP is a wrapper of an UnsignedIP with the signature from a signer.

func (*SignedIP) Verify 

func (ip *SignedIP) Verify(
	cert *staking.Certificate,
	maxTimestamp time.Time,
) error

Returns nil if: * [ip.Timestamp] is not after [maxTimestamp]. * [ip.TLSSignature] is a valid signature over [ip.UnsignedIP] from [cert].

type UnsignedIP 

type UnsignedIP struct {
	ips.IPPort
	Timestamp uint64
}

UnsignedIP is used for a validator to claim an IP. The [Timestamp] is used to ensure that the most updated IP claim is tracked by peers for a given validator.

func (*UnsignedIP) Sign 

func (ip *UnsignedIP) Sign(tlsSigner crypto.Signer, blsSigner *bls.SecretKey) (*SignedIP, error)

Sign this IP with the provided signer and return the signed IP.

type Upgrader 

type Upgrader interface {
	// Must be thread safe
	Upgrade(net.Conn) (ids.NodeID, net.Conn, *staking.Certificate, error)
}

func NewTLSClientUpgrader 

func NewTLSClientUpgrader(config *tls.Config, invalidCerts prometheus.Counter) Upgrader

func NewTLSServerUpgrader 

func NewTLSServerUpgrader(config *tls.Config, invalidCerts prometheus.Counter) Upgrader

Source Files

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