pubsub

package module
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 Go to latest Published: Jul 9, 2021 License: Apache-2.0, MIT, Apache-2.0, + 1 more Imports: 36 Imported by: 0

README

go-libp2p-pubsub


This repo contains the canonical pubsub implementation for libp2p. We currently provide three message router options:

  • Floodsub, which is the baseline flooding protocol.
  • Randomsub, which is a simple probabilistic router that propagates to random subsets of peers.
  • Gossipsub, which is a more advanced router with mesh formation and gossip propagation. See spec and implementation for more details.

PSA: The Hardening Extensions for Gossipsub (Gossipsub V1.1) can be found under development at https://github.com/libp2p/go-libp2p-pubsub/pull/263

Repo Lead Maintainer

@vyzo

This repo follows the Repo Lead Maintainer Protocol

Table of Contents

Install

go get github.com/libp2p/go-libp2p-pubsub

Usage

To be used for messaging in p2p instrastructure (as part of libp2p) such as IPFS, Ethereum, other blockchains, etc.

Example

https://github.com/libp2p/go-libp2p/tree/master/examples/pubsub

Documentation

See the libp2p specs for high level documentation and godoc for API documentation.

In this repo, you will find
.
├── LICENSE
├── README.md
# Regular Golang repo set up
├── codecov.yml
├── pb
├── go.mod
├── go.sum
├── doc.go
# PubSub base
├── pubsub.go
├── blacklist.go
├── notify.go
├── comm.go
├── discovery.go
├── sign.go
├── subscription.go
├── topic.go
├── trace.go
├── tracer.go
├── validation.go
# Floodsub router
├── floodsub.go
# Randomsub router
├── randomsub.go
# Gossipsub router
├── gossipsub.go
├── score.go
├── score_params.go
└── mcache.go
Tracing

The pubsub system supports tracing, which collects all events pertaining to the internals of the system. This allows you to recreate the complete message flow and state of the system for analysis purposes.

To enable tracing, instantiate the pubsub system using the WithEventTracer option; the option accepts a tracer with three available implementations in-package (trace to json, pb, or a remote peer). If you want to trace using a remote peer, you can do so using the traced daemon from go-libp2p-pubsub-tracer. The package also includes a utility program, tracestat, for analyzing the traces collected by the daemon.

For instance, to capture the trace as a json file, you can use the following option:

pubsub.NewGossipSub(..., pubsub.NewEventTracer(pubsub.NewJSONTracer("/path/to/trace.json")))

To capture the trace as a protobuf, you can use the following option:

pubsub.NewGossipSub(..., pubsub.NewEventTracer(pubsub.NewPBTracer("/path/to/trace.pb")))

Finally, to use the remote tracer, you can use the following incantations:

// assuming that your tracer runs in x.x.x.x and has a peer ID of QmTracer
pi, err := peer.AddrInfoFromP2pAddr(ma.StringCast("/ip4/x.x.x.x/tcp/4001/p2p/QmTracer"))
if err != nil {
  panic(err)
}

tracer, err := pubsub.NewRemoteTracer(ctx, host, pi)
if err != nil {
  panic(err)
}

ps, err := pubsub.NewGossipSub(..., pubsub.WithEventTracer(tracer))

Contribute

Contributions welcome. Please check out the issues.

Check out our contributing document for more information on how we work, and about contributing in general. Please be aware that all interactions related to multiformats are subject to the IPFS Code of Conduct.

Small note: If editing the README, please conform to the standard-readme specification.

License

The go-libp2p-pubsub project is dual-licensed under Apache 2.0 and MIT terms:

Documentation

Overview

The pubsub package provides facilities for the Publish/Subscribe pattern of message propagation, also known as overlay multicast. The implementation provides topic-based pubsub, with pluggable routing algorithms.

The main interface to the library is the PubSub object. You can construct this object with the following constructors:

- NewFloodSub creates an instance that uses the floodsub routing algorithm.

- NewGossipSub creates an instance that uses the gossipsub routing algorithm.

- NewRandomSub creates an instance that uses the randomsub routing algorithm.

In addition, there is a generic constructor that creates a pubsub instance with a custom PubSubRouter interface. This procedure is currently reserved for internal use within the package.

Once you have constructed a PubSub instance, you need to establish some connections to your peers; the implementation relies on ambient peer discovery, leaving bootstrap and active peer discovery up to the client.

To publish a message to some topic, use Publish; you don't need to be subscribed to the topic in order to publish.

To subscribe to a topic, use Subscribe; this will give you a subscription interface from which new messages can be pumped.

Index

Constants

View Source 
const (
	FloodSubID              = protocol.ID("/floodsub/1.0.0")
	FloodSubTopicSearchSize = 5
)
View Source 
const (
	// GossipSubID_v10 is the protocol ID for version 1.0.0 of the GossipSub protocol.
	// It is advertised along with GossipSubID_v11 for backwards compatibility.
	GossipSubID_v10 = protocol.ID("/meshsub/1.0.0")

	// GossipSubID_v11 is the protocol ID for version 1.1.0 of the GossipSub protocol.
	// See the spec for details about how v1.1.0 compares to v1.0.0:
	// https://github.com/libp2p/specs/blob/master/pubsub/gossipsub/gossipsub-v1.1.md
	GossipSubID_v11 = protocol.ID("/meshsub/1.1.0")
)
View Source 
const (
	// Protocol supports basic GossipSub Mesh -- gossipsub-v1.0 compatible
	GossipSubFeatureMesh = iota
	// Protocol supports Peer eXchange on prune -- gossipsub-v1.1 compatible
	GossipSubFeaturePX
)
View Source 
const (
	DefaultDecayInterval = time.Second
	DefaultDecayToZero   = 0.01
)
View Source 
const (
	// StrictSign produces signatures and expects and verifies incoming signatures
	StrictSign = msgSigning | msgVerification
	// StrictNoSign does not produce signatures and drops and penalises incoming messages that carry one
	StrictNoSign = msgVerification
	// LaxSign produces signatures and validates incoming signatures iff one is present
	// Deprecated: it is recommend to either strictly enable, or strictly disable, signatures.
	LaxSign = msgSigning
	// LaxNoSign does not produce signatures and validates incoming signatures iff one is present
	// Deprecated: it is recommend to either strictly enable, or strictly disable, signatures.
	LaxNoSign = 0
)
View Source 
const (
	RejectBlacklstedPeer      = "blacklisted peer"
	RejectBlacklistedSource   = "blacklisted source"
	RejectMissingSignature    = "missing signature"
	RejectUnexpectedSignature = "unexpected signature"
	RejectUnexpectedAuthInfo  = "unexpected auth info"
	RejectInvalidSignature    = "invalid signature"
	RejectValidationQueueFull = "validation queue full"
	RejectValidationThrottled = "validation throttled"
	RejectValidationFailed    = "validation failed"
	RejectValidationIgnored   = "validation ignored"
	RejectSelfOrigin          = "self originated message"
)

rejection reasons

View Source 
const (
	// ValidationAccept is a validation decision that indicates a valid message that should be accepted and
	// delivered to the application and forwarded to the network.
	ValidationAccept = ValidationResult(0)
	// ValidationReject is a validation decision that indicates an invalid message that should not be
	// delivered to the application or forwarded to the application. Furthermore the peer that forwarded
	// the message should be penalized by peer scoring routers.
	ValidationReject = ValidationResult(1)
	// ValidationIgnore is a validation decision that indicates a message that should be ignored: it will
	// be neither delivered to the application nor forwarded to the network. However, in contrast to
	// ValidationReject, the peer that forwarded the message must not be penalized by peer scoring routers.
	ValidationIgnore = ValidationResult(2)
)
View Source 
const DefaultMaxMessageSize = 1 << 20

DefaultMaximumMessageSize is 1mb.

View Source 
const (
	RandomSubID = protocol.ID("/randomsub/1.0.0")
)
View Source 
const RemoteTracerProtoID = protocol.ID("/libp2p/pubsub/tracer/1.0.0")
View Source 
const SignPrefix = "libp2p-pubsub:"

Variables

View Source 
var (

	// DiscoveryPollInitialDelay is how long the discovery system waits after it first starts before polling
	DiscoveryPollInitialDelay = 0 * time.Millisecond
	// DiscoveryPollInterval is approximately how long the discovery system waits in between checks for whether the
	// more peers are needed for any topic
	DiscoveryPollInterval = 1 * time.Second
)
View Source 
var (
	GossipSubD                                = 6
	GossipSubDlo                              = 5
	GossipSubDhi                              = 12
	GossipSubDscore                           = 4
	GossipSubDout                             = 2
	GossipSubHistoryLength                    = 5
	GossipSubHistoryGossip                    = 3
	GossipSubDlazy                            = 6
	GossipSubGossipFactor                     = 0.25
	GossipSubGossipRetransmission             = 3
	GossipSubHeartbeatInitialDelay            = 100 * time.Millisecond
	GossipSubHeartbeatInterval                = 1 * time.Second
	GossipSubFanoutTTL                        = 60 * time.Second
	GossipSubPrunePeers                       = 16
	GossipSubPruneBackoff                     = time.Minute
	GossipSubConnectors                       = 8
	GossipSubMaxPendingConnections            = 128
	GossipSubConnectionTimeout                = 30 * time.Second
	GossipSubDirectConnectTicks        uint64 = 300
	GossipSubDirectConnectInitialDelay        = time.Second
	GossipSubOpportunisticGraftTicks   uint64 = 60
	GossipSubOpportunisticGraftPeers          = 2
	GossipSubGraftFloodThreshold              = 10 * time.Second
	GossipSubMaxIHaveLength                   = 5000
	GossipSubMaxIHaveMessages                 = 10
	GossipSubIWantFollowupTime                = 3 * time.Second
)

Defines the default gossipsub parameters.

View Source 
var (
	DefaultPeerGaterRetainStats     = 6 * time.Hour
	DefaultPeerGaterQuiet           = time.Minute
	DefaultPeerGaterDuplicateWeight = 0.125
	DefaultPeerGaterIgnoreWeight    = 1.0
	DefaultPeerGaterRejectWeight    = 16.0
	DefaultPeerGaterThreshold       = 0.33
	DefaultPeerGaterGlobalDecay     = ScoreParameterDecay(2 * time.Minute)
	DefaultPeerGaterSourceDecay     = ScoreParameterDecay(time.Hour)
)
View Source 
var (
	TimeCacheDuration = 120 * time.Second

	// ErrSubscriptionCancelled may be returned when a subscription Next() is called after the
	// subscription has been cancelled.
	ErrSubscriptionCancelled = errors.New("subscription cancelled")
)
View Source 
var (
	// GossipSubConnTagBumpMessageDelivery is the amount to add to the connection manager
	// tag that tracks message deliveries. Each time a peer is the first to deliver a
	// message within a topic, we "bump" a tag by this amount, up to a maximum
	// of GossipSubConnTagMessageDeliveryCap.
	// Note that the delivery tags decay over time, decreasing by GossipSubConnTagDecayAmount
	// at every GossipSubConnTagDecayInterval.
	GossipSubConnTagBumpMessageDelivery = 1

	// GossipSubConnTagDecayInterval is the decay interval for decaying connection manager tags.
	GossipSubConnTagDecayInterval = 10 * time.Minute

	// GossipSubConnTagDecayAmount is subtracted from decaying tag values at each decay interval.
	GossipSubConnTagDecayAmount = 1

	// GossipSubConnTagMessageDeliveryCap is the maximum value for the connection manager tags that
	// track message deliveries.
	GossipSubConnTagMessageDeliveryCap = 15
)
View Source 
var ErrTooManySubscriptions = errors.New("too many subscriptions")

ErrTooManySubscriptions may be returned by a SubscriptionFilter to signal that there are too many subscriptions to process.

View Source 
var ErrTopicClosed = errors.New("this Topic is closed, try opening a new one")

ErrTopicClosed is returned if a Topic is utilized after it has been closed

View Source 
var GossipSubDefaultProtocols = []protocol.ID{GossipSubID_v11, GossipSubID_v10, FloodSubID}

GossipSubDefaultProtocols is the default gossipsub router protocol list

View Source 
var MinTraceBatchSize = 16
View Source 
var (
	RandomSubD = 6
)
View Source 
var TraceBufferSize = 1 << 16 // 64K ought to be enough for everyone; famous last words.

Functions

func DefaultMsgIdFn 

func DefaultMsgIdFn(pmsg *pb.Message) string

DefaultMsgIdFn returns a unique ID of the passed Message

func FilterSubscriptions 

func FilterSubscriptions(subs []*pb.RPC_SubOpts, filter func(string) bool) []*pb.RPC_SubOpts

FilterSubscriptions filters (and deduplicates) a list of subscriptions. filter should return true if a topic is of interest.

func GossipSubDefaultFeatures 

func GossipSubDefaultFeatures(feat GossipSubFeature, proto protocol.ID) bool

GossipSubDefaultFeatures is the feature test function for the default gossipsub protocols

func ScoreParameterDecay 

func ScoreParameterDecay(decay time.Duration) float64

ScoreParameterDecay computes the decay factor for a parameter, assuming the DecayInterval is 1s and that the value decays to zero if it drops below 0.01

func ScoreParameterDecayWithBase 

func ScoreParameterDecayWithBase(decay time.Duration, base time.Duration, decayToZero float64) float64

ScoreParameterDecay computes the decay factor for a parameter using base as the DecayInterval

Types

type AcceptStatus 

type AcceptStatus int
const (
	// AcceptAll signals to accept the incoming RPC for full processing
	AcceptNone AcceptStatus = iota
	// AcceptControl signals to accept the incoming RPC only for control message processing by
	// the router. Included payload messages will _not_ be pushed to the validation queue.
	AcceptControl
	// AcceptNone signals to drop the incoming RPC
	AcceptAll
)

type BackoffConnectorFactory 

type BackoffConnectorFactory func(host host.Host) (*discimpl.BackoffConnector, error)

BackoffConnectorFactory creates a BackoffConnector that is attached to a given host

type Blacklist 

type Blacklist interface {
	Add(peer.ID) bool
	Contains(peer.ID) bool
}

Blacklist is an interface for peer blacklisting.

func NewMapBlacklist 

func NewMapBlacklist() Blacklist

NewMapBlacklist creates a new MapBlacklist

func NewTimeCachedBlacklist 

func NewTimeCachedBlacklist(expiry time.Duration) (Blacklist, error)

NewTimeCachedBlacklist creates a new TimeCachedBlacklist with the given expiry duration

type CacheEntry 

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

type DiscoverOpt 

type DiscoverOpt func(*discoverOptions) error

func WithDiscoverConnector 

func WithDiscoverConnector(connFactory BackoffConnectorFactory) DiscoverOpt

WithDiscoverConnector adds a custom connector that deals with how the discovery subsystem connects to peers

func WithDiscoveryOpts 

func WithDiscoveryOpts(opts ...discovery.Option) DiscoverOpt

WithDiscoveryOpts passes libp2p Discovery options into the PubSub discovery subsystem

type EventTracer 

type EventTracer interface {
	Trace(evt *pb.TraceEvent)
}

EventTracer is a generic event tracer interface. This is a high level tracing interface which delivers tracing events, as defined by the protobuf schema in pb/trace.proto.

type EventType 

type EventType int
const (
	PeerJoin EventType = iota
	PeerLeave
)

type ExtendedPeerScoreInspectFn 

type ExtendedPeerScoreInspectFn = func(map[peer.ID]*PeerScoreSnapshot)

type FloodSubRouter 

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

func (*FloodSubRouter) AcceptFrom 

func (fs *FloodSubRouter) AcceptFrom(peer.ID) AcceptStatus

func (*FloodSubRouter) AddPeer 

func (fs *FloodSubRouter) AddPeer(p peer.ID, proto protocol.ID)

func (*FloodSubRouter) Attach 

func (fs *FloodSubRouter) Attach(p *PubSub)

func (*FloodSubRouter) EnoughPeers 

func (fs *FloodSubRouter) EnoughPeers(topic string, suggested int) bool

func (*FloodSubRouter) HandleRPC 

func (fs *FloodSubRouter) HandleRPC(rpc *RPC)

func (*FloodSubRouter) Join 

func (fs *FloodSubRouter) Join(topic string)

func (*FloodSubRouter) Leave 

func (fs *FloodSubRouter) Leave(topic string)

func (*FloodSubRouter) Protocols 

func (fs *FloodSubRouter) Protocols() []protocol.ID

func (*FloodSubRouter) Publish 

func (fs *FloodSubRouter) Publish(msg *Message)

func (*FloodSubRouter) RemovePeer 

func (fs *FloodSubRouter) RemovePeer(p peer.ID)

type GossipSubFeature 

type GossipSubFeature int

GossipSubFeature is a feature discriminant enum

type GossipSubFeatureTest 

type GossipSubFeatureTest = func(GossipSubFeature, protocol.ID) bool

GossipSubFeatureTest is a feature test function; it takes a feature and a protocol ID and should return true if the feature is supported by the protocol

type GossipSubParams 

type GossipSubParams struct {

	// D sets the optimal degree for a GossipSub topic mesh. For example, if D == 6,
	// each peer will want to have about six peers in their mesh for each topic they're subscribed to.
	// D should be set somewhere between Dlo and Dhi.
	D int

	// Dlo sets the lower bound on the number of peers we keep in a GossipSub topic mesh.
	// If we have fewer than Dlo peers, we will attempt to graft some more into the mesh at
	// the next heartbeat.
	Dlo int

	// Dhi sets the upper bound on the number of peers we keep in a GossipSub topic mesh.
	// If we have more than Dhi peers, we will select some to prune from the mesh at the next heartbeat.
	Dhi int

	// Dscore affects how peers are selected when pruning a mesh due to over subscription.
	// At least Dscore of the retained peers will be high-scoring, while the remainder are
	// chosen randomly.
	Dscore int

	// Dout sets the quota for the number of outbound connections to maintain in a topic mesh.
	// When the mesh is pruned due to over subscription, we make sure that we have outbound connections
	// to at least Dout of the survivor peers. This prevents sybil attackers from overwhelming
	// our mesh with incoming connections.
	//
	// Dout must be set below Dlo, and must not exceed D / 2.
	Dout int

	// HistoryLength controls the size of the message cache used for gossip.
	// The message cache will remember messages for HistoryLength heartbeats.
	HistoryLength int

	// HistoryGossip controls how many cached message ids we will advertise in
	// IHAVE gossip messages. When asked for our seen message IDs, we will return
	// only those from the most recent HistoryGossip heartbeats. The slack between
	// HistoryGossip and HistoryLength allows us to avoid advertising messages
	// that will be expired by the time they're requested.
	//
	// HistoryGossip must be less than or equal to HistoryLength to
	// avoid a runtime panic.
	HistoryGossip int

	// Dlazy affects how many peers we will emit gossip to at each heartbeat.
	// We will send gossip to at least Dlazy peers outside our mesh. The actual
	// number may be more, depending on GossipFactor and how many peers we're
	// connected to.
	Dlazy int

	// GossipFactor affects how many peers we will emit gossip to at each heartbeat.
	// We will send gossip to GossipFactor * (total number of non-mesh peers), or
	// Dlazy, whichever is greater.
	GossipFactor float64

	// GossipRetransmission controls how many times we will allow a peer to request
	// the same message id through IWANT gossip before we start ignoring them. This is designed
	// to prevent peers from spamming us with requests and wasting our resources.
	GossipRetransmission int

	// HeartbeatInitialDelay is the short delay before the heartbeat timer begins
	// after the router is initialized.
	HeartbeatInitialDelay time.Duration

	// HeartbeatInterval controls the time between heartbeats.
	HeartbeatInterval time.Duration

	// FanoutTTL controls how long we keep track of the fanout state. If it's been
	// FanoutTTL since we've published to a topic that we're not subscribed to,
	// we'll delete the fanout map for that topic.
	FanoutTTL time.Duration

	// PrunePeers controls the number of peers to include in prune Peer eXchange.
	// When we prune a peer that's eligible for PX (has a good score, etc), we will try to
	// send them signed peer records for up to PrunePeers other peers that we
	// know of.
	PrunePeers int

	// PruneBackoff controls the backoff time for pruned peers. This is how long
	// a peer must wait before attempting to graft into our mesh again after being pruned.
	// When pruning a peer, we send them our value of PruneBackoff so they know
	// the minimum time to wait. Peers running older versions may not send a backoff time,
	// so if we receive a prune message without one, we will wait at least PruneBackoff
	// before attempting to re-graft.
	PruneBackoff time.Duration

	// Connectors controls the number of active connection attempts for peers obtained through PX.
	Connectors int

	// MaxPendingConnections sets the maximum number of pending connections for peers attempted through px.
	MaxPendingConnections int

	// ConnectionTimeout controls the timeout for connection attempts.
	ConnectionTimeout time.Duration

	// DirectConnectTicks is the number of heartbeat ticks for attempting to reconnect direct peers
	// that are not currently connected.
	DirectConnectTicks uint64

	// DirectConnectInitialDelay is the initial delay before opening connections to direct peers
	DirectConnectInitialDelay time.Duration

	// OpportunisticGraftTicks is the number of heartbeat ticks for attempting to improve the mesh
	// with opportunistic grafting. Every OpportunisticGraftTicks we will attempt to select some
	// high-scoring mesh peers to replace lower-scoring ones, if the median score of our mesh peers falls
	// below a threshold (see https://godoc.org/github.com/libp2p/go-libp2p-pubsub#PeerScoreThresholds).
	OpportunisticGraftTicks uint64

	// OpportunisticGraftPeers is the number of peers to opportunistically graft.
	OpportunisticGraftPeers int

	// If a GRAFT comes before GraftFloodThreshold has elapsed since the last PRUNE,
	// then there is an extra score penalty applied to the peer through P7.
	GraftFloodThreshold time.Duration

	// MaxIHaveLength is the maximum number of messages to include in an IHAVE message.
	// Also controls the maximum number of IHAVE ids we will accept and request with IWANT from a
	// peer within a heartbeat, to protect from IHAVE floods. You should adjust this value from the
	// default if your system is pushing more than 5000 messages in HistoryGossip heartbeats;
	// with the defaults this is 1666 messages/s.
	MaxIHaveLength int

	// MaxIHaveMessages is the maximum number of IHAVE messages to accept from a peer within a heartbeat.
	MaxIHaveMessages int

	// Time to wait for a message requested through IWANT following an IHAVE advertisement.
	// If the message is not received within this window, a broken promise is declared and
	// the router may apply bahavioural penalties.
	IWantFollowupTime time.Duration
}

GossipSubParams defines all the gossipsub specific parameters.

func DefaultGossipSubParams 

func DefaultGossipSubParams() GossipSubParams

DefaultGossipSubParams returns the default gossip sub parameters as a config.

type GossipSubRouter 

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

GossipSubRouter is a router that implements the gossipsub protocol. For each topic we have joined, we maintain an overlay through which messages flow; this is the mesh map. For each topic we publish to without joining, we maintain a list of peers to use for injecting our messages in the overlay with stable routes; this is the fanout map. Fanout peer lists are expired if we don't publish any messages to their topic for GossipSubFanoutTTL.

func (*GossipSubRouter) AcceptFrom 

func (gs *GossipSubRouter) AcceptFrom(p peer.ID) AcceptStatus

func (*GossipSubRouter) AddPeer 

func (gs *GossipSubRouter) AddPeer(p peer.ID, proto protocol.ID)

func (*GossipSubRouter) Attach 

func (gs *GossipSubRouter) Attach(p *PubSub)

func (*GossipSubRouter) EnoughPeers 

func (gs *GossipSubRouter) EnoughPeers(topic string, suggested int) bool

func (*GossipSubRouter) HandleRPC 

func (gs *GossipSubRouter) HandleRPC(rpc *RPC)

func (*GossipSubRouter) Join 

func (gs *GossipSubRouter) Join(topic string)

func (*GossipSubRouter) Leave 

func (gs *GossipSubRouter) Leave(topic string)

func (*GossipSubRouter) Protocols 

func (gs *GossipSubRouter) Protocols() []protocol.ID

func (*GossipSubRouter) Publish 

func (gs *GossipSubRouter) Publish(msg *Message)

func (*GossipSubRouter) RemovePeer 

func (gs *GossipSubRouter) RemovePeer(p peer.ID)

type JSONTracer 

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

JSONTracer is a tracer that writes events to a file, encoded in ndjson.

func NewJSONTracer 

func NewJSONTracer(file string) (*JSONTracer, error)

NewJsonTracer creates a new JSONTracer writing traces to file.

func OpenJSONTracer 

func OpenJSONTracer(file string, flags int, perm os.FileMode) (*JSONTracer, error)

OpenJSONTracer creates a new JSONTracer, with explicit control of OpenFile flags and permissions.

func (*JSONTracer) Close 

func (t *JSONTracer) Close()

func (*JSONTracer) Trace 

func (t *JSONTracer) Trace(evt *pb.TraceEvent)

type MapBlacklist 

type MapBlacklist map[peer.ID]struct{}

MapBlacklist is a blacklist implementation using a perfect map

func (MapBlacklist) Add 

func (b MapBlacklist) Add(p peer.ID) bool

func (MapBlacklist) Contains 

func (b MapBlacklist) Contains(p peer.ID) bool

type Message 

type Message struct {
	*pb.Message
	ReceivedFrom  peer.ID
	ValidatorData interface{}
}

func (*Message) GetFrom 

func (m *Message) GetFrom() peer.ID

type MessageCache 

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

func NewMessageCache 

func NewMessageCache(gossip, history int) *MessageCache

NewMessageCache creates a sliding window cache that remembers messages for as long as `history` slots.

When queried for messages to advertise, the cache only returns messages in the last `gossip` slots.

The `gossip` parameter must be smaller or equal to `history`, or this function will panic.

The slack between `gossip` and `history` accounts for the reaction time between when a message is advertised via IHAVE gossip, and the peer pulls it via an IWANT command.

func (*MessageCache) Get 

func (mc *MessageCache) Get(mid string) (*pb.Message, bool)

func (*MessageCache) GetForPeer 

func (mc *MessageCache) GetForPeer(mid string, p peer.ID) (*pb.Message, int, bool)

func (*MessageCache) GetGossipIDs 

func (mc *MessageCache) GetGossipIDs(topic string) []string

func (*MessageCache) Put 

func (mc *MessageCache) Put(msg *pb.Message)

func (*MessageCache) SetMsgIdFn 

func (mc *MessageCache) SetMsgIdFn(msgID MsgIdFunction)

func (*MessageCache) Shift 

func (mc *MessageCache) Shift()

type MessageSignaturePolicy 

type MessageSignaturePolicy uint8

MessageSignaturePolicy describes if signatures are produced, expected, and/or verified.

type MsgIdFunction 

type MsgIdFunction func(pmsg *pb.Message) string

MsgIdFunction returns a unique ID for the passed Message, and PubSub can be customized to use any implementation of this function by configuring it with the Option from WithMessageIdFn.

type Option 

type Option func(*PubSub) error

func WithBlacklist 

func WithBlacklist(b Blacklist) Option

WithBlacklist provides an implementation of the blacklist; the default is a MapBlacklist

func WithDirectConnectTicks 

func WithDirectConnectTicks(t uint64) Option

WithDirectConnectTicks is a gossipsub router option that sets the number of heartbeat ticks between attempting to reconnect direct peers that are not currently connected. A "tick" is based on the heartbeat interval, which is 1s by default. The default value for direct connect ticks is 300.

func WithDirectPeers 

func WithDirectPeers(pis []peer.AddrInfo) Option

WithDirectPeers is a gossipsub router option that specifies peers with direct peering agreements. These peers are connected outside of the mesh, with all (valid) message unconditionally forwarded to them. The router will maintain open connections to these peers. Note that the peering agreement should be reciprocal with direct peers symmetrically configured at both ends.

func WithDiscovery 

func WithDiscovery(d discovery.Discovery, opts ...DiscoverOpt) Option

WithDiscovery provides a discovery mechanism used to bootstrap and provide peers into PubSub

func WithEventTracer 

func WithEventTracer(tracer EventTracer) Option

WithEventTracer provides a tracer for the pubsub system

func WithFloodPublish 

func WithFloodPublish(floodPublish bool) Option

WithFloodPublish is a gossipsub router option that enables flood publishing. When this is enabled, published messages are forwarded to all peers with score >= to publishThreshold

func WithGossipSubParams 

func WithGossipSubParams(cfg GossipSubParams) Option

WithGossipSubParams is a gossip sub router option that allows a custom config to be set when instantiating the gossipsub router.

func WithGossipSubProtocols 

func WithGossipSubProtocols(protos []protocol.ID, feature GossipSubFeatureTest) Option

WithGossipSubProtocols is a gossipsub router option that configures a custom protocol list and feature test function

func WithMaxMessageSize 

func WithMaxMessageSize(maxMessageSize int) Option

WithMaxMessageSize sets the global maximum message size for pubsub wire messages. The default value is 1MiB (DefaultMaxMessageSize).

Observe the following warnings when setting this option.

WARNING #1: Make sure to change the default protocol prefixes for floodsub (FloodSubID) and gossipsub (GossipSubID). This avoids accidentally joining the public default network, which uses the default max message size, and therefore will cause messages to be dropped.

WARNING #2: Reducing the default max message limit is fine, if you are certain that your application messages will not exceed the new limit. However, be wary of increasing the limit, as pubsub networks are naturally write-amplifying, i.e. for every message we receive, we send D copies of the message to our peers. If those messages are large, the bandwidth requirements will grow linearly. Note that propagation is sent on the uplink, which traditionally is more constrained than the downlink. Instead, consider out-of-band retrieval for large messages, by sending a CID (Content-ID) or another type of locator, such that messages can be fetched on-demand, rather than being pushed proactively. Under this design, you'd use the pubsub layer as a signalling system, rather than a data delivery system.

func WithMessageAuthor 

func WithMessageAuthor(author peer.ID) Option

WithMessageAuthor sets the author for outbound messages to the given peer ID (defaults to the host's ID). If message signing is enabled, the private key must be available in the host's peerstore.

func WithMessageIdFn 

func WithMessageIdFn(fn MsgIdFunction) Option

WithMessageIdFn is an option to customize the way a message ID is computed for a pubsub message. The default ID function is DefaultMsgIdFn (concatenate source and seq nr.), but it can be customized to e.g. the hash of the message.

func WithMessageSignaturePolicy 

func WithMessageSignaturePolicy(policy MessageSignaturePolicy) Option

WithMessageSignaturePolicy sets the mode of operation for producing and verifying message signatures.

func WithMessageSigning 

func WithMessageSigning(enabled bool) Option

WithMessageSigning enables or disables message signing (enabled by default). Deprecated: signature verification without message signing, or message signing without verification, are not recommended.

func WithNoAuthor 

func WithNoAuthor() Option

WithNoAuthor omits the author and seq-number data of messages, and disables the use of signatures. Not recommended to use with the default message ID function, see WithMessageIdFn.

func WithPeerExchange 

func WithPeerExchange(doPX bool) Option

WithPeerExchange is a gossipsub router option that enables Peer eXchange on PRUNE. This should generally be enabled in bootstrappers and well connected/trusted nodes used for bootstrapping.

func WithPeerGater 

func WithPeerGater(params *PeerGaterParams) Option

WithPeerGater is a gossipsub router option that enables reactive validation queue management. The Gater is activated if the ratio of throttled/validated messages exceeds the specified threshold. Once active, the Gater probabilistically throttles peers _before_ they enter the validation queue, performing Random Early Drop. The throttle decision is randomized, with the probability of allowing messages to enter the validation queue controlled by the statistical observations of the performance of all peers in the IP address of the gated peer. The Gater deactivates if there is no validation throttlinc occurring for the specified quiet interval.

func WithPeerOutboundQueueSize 

func WithPeerOutboundQueueSize(size int) Option

WithPeerOutboundQueueSize is an option to set the buffer size for outbound messages to a peer We start dropping messages to a peer if the outbound queue if full

func WithPeerScore 

func WithPeerScore(params *PeerScoreParams, thresholds *PeerScoreThresholds) Option

WithPeerScore is a gossipsub router option that enables peer scoring.

func WithPeerScoreInspect 

func WithPeerScoreInspect(inspect interface{}, period time.Duration) Option

WithPeerScoreInspect is a gossipsub router option that enables peer score debugging. When this option is enabled, the supplied function will be invoked periodically to allow the application to inspect or dump the scores for connected peers. The supplied function can have one of two signatures:

  • PeerScoreInspectFn, which takes a map of peer IDs to score.
  • ExtendedPeerScoreInspectFn, which takes a map of peer IDs to PeerScoreSnapshots and allows inspection of individual score components for debugging peer scoring.

This option must be passed _after_ the WithPeerScore option.

func WithRawTracer 

func WithRawTracer(tracer RawTracer) Option

WithRawTracer adds a raw tracer to the pubsub system. Multiple tracers can be added using multiple invocations of the option.

func WithStrictSignatureVerification 

func WithStrictSignatureVerification(required bool) Option

WithStrictSignatureVerification is an option to enable or disable strict message signing. When enabled (which is the default), unsigned messages will be discarded. Deprecated: signature verification without message signing, or message signing without verification, are not recommended.

func WithSubscriptionFilter 

func WithSubscriptionFilter(subFilter SubscriptionFilter) Option

WithSubscriptionFilter is a pubsub option that specifies a filter for subscriptions in topics of interest.

func WithValidateQueueSize 

func WithValidateQueueSize(n int) Option

WithValidateQueueSize sets the buffer of validate queue. Defaults to 32. When queue is full, validation is throttled and new messages are dropped.

func WithValidateThrottle 

func WithValidateThrottle(n int) Option

WithValidateThrottle sets the upper bound on the number of active validation goroutines across all topics. The default is 8192.

func WithValidateWorkers 

func WithValidateWorkers(n int) Option

WithValidateWorkers sets the number of synchronous validation worker goroutines. Defaults to NumCPU.

The synchronous validation workers perform signature validation, apply inline user validators, and schedule asynchronous user validators. You can adjust this parameter to devote less cpu time to synchronous validation.

type PBTracer 

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

PBTracer is a tracer that writes events to a file, as delimited protobufs.

func NewPBTracer 

func NewPBTracer(file string) (*PBTracer, error)

func OpenPBTracer 

func OpenPBTracer(file string, flags int, perm os.FileMode) (*PBTracer, error)

OpenPBTracer creates a new PBTracer, with explicit control of OpenFile flags and permissions.

func (*PBTracer) Close 

func (t *PBTracer) Close()

func (*PBTracer) Trace 

func (t *PBTracer) Trace(evt *pb.TraceEvent)

type PeerEvent 

type PeerEvent struct {
	Type EventType
	Peer peer.ID
}

type PeerGaterParams 

type PeerGaterParams struct {
	// when the ratio of throttled/validated messages exceeds this threshold, the gater turns on
	Threshold float64
	// (linear) decay parameter for gater counters
	GlobalDecay float64 // global counter decay
	SourceDecay float64 // per IP counter decay
	// decay interval
	DecayInterval time.Duration
	// counter zeroing threshold
	DecayToZero float64
	// how long to retain stats
	RetainStats time.Duration
	// quiet interval before turning off the gater; if there are no validation throttle events
	// for this interval, the gater turns off
	Quiet time.Duration
	// weight of duplicate message deliveries
	DuplicateWeight float64
	// weight of ignored messages
	IgnoreWeight float64
	// weight of rejected messages
	RejectWeight float64

	// priority topic delivery weights
	TopicDeliveryWeights map[string]float64
}

PeerGaterParams groups together parameters that control the operation of the peer gater

func DefaultPeerGaterParams 

func DefaultPeerGaterParams() *PeerGaterParams

DefaultPeerGaterParams creates a new PeerGaterParams struct using default values

func NewPeerGaterParams 

func NewPeerGaterParams(threshold, globalDecay, sourceDecay float64) *PeerGaterParams

NewPeerGaterParams creates a new PeerGaterParams struct, using the specified threshold and decay parameters and default values for all other parameters.

func (*PeerGaterParams) WithTopicDeliveryWeights 

func (p *PeerGaterParams) WithTopicDeliveryWeights(w map[string]float64) *PeerGaterParams

WithTopicDeliveryWeights is a fluid setter for the priority topic delivery weights

type PeerScoreInspectFn 

type PeerScoreInspectFn = func(map[peer.ID]float64)

type PeerScoreParams 

type PeerScoreParams struct {
	// Score parameters per topic.
	Topics map[string]*TopicScoreParams

	// Aggregate topic score cap; this limits the total contribution of topics towards a positive
	// score. It must be positive (or 0 for no cap).
	TopicScoreCap float64

	// P5: Application-specific peer scoring
	AppSpecificScore  func(p peer.ID) float64
	AppSpecificWeight float64

	// P6: IP-colocation factor.
	// The parameter has an associated counter which counts the number of peers with the same IP.
	// If the number of peers in the same IP exceeds IPColocationFactorThreshold, then the value
	// is the square of the difference, ie (PeersInSameIP - IPColocationThreshold)^2.
	// If the number of peers in the same IP is less than the threshold, then the value is 0.
	// The weight of the parameter MUST be negative, unless you want to disable for testing.
	// Note: In order to simulate many IPs in a managable manner when testing, you can set the weight to 0
	//       thus disabling the IP colocation penalty.
	IPColocationFactorWeight    float64
	IPColocationFactorThreshold int
	IPColocationFactorWhitelist []*net.IPNet

	// P7: behavioural pattern penalties.
	// This parameter has an associated counter which tracks misbehaviour as detected by the
	// router. The router currently applies penalties for the following behaviors:
	// - attempting to re-graft before the prune backoff time has elapsed.
	// - not following up in IWANT requests for messages advertised with IHAVE.
	//
	// The value of the parameter is the square of the counter over the threshold, which decays with
	// BehaviourPenaltyDecay.
	// The weight of the parameter MUST be negative (or zero to disable).
	BehaviourPenaltyWeight, BehaviourPenaltyThreshold, BehaviourPenaltyDecay float64

	// the decay interval for parameter counters.
	DecayInterval time.Duration

	// counter value below which it is considered 0.
	DecayToZero float64

	// time to remember counters for a disconnected peer.
	RetainScore time.Duration
}

type PeerScoreSnapshot 

type PeerScoreSnapshot struct {
	Score              float64
	Topics             map[string]*TopicScoreSnapshot
	AppSpecificScore   float64
	IPColocationFactor float64
	BehaviourPenalty   float64
}

type PeerScoreThresholds 

type PeerScoreThresholds struct {
	// GossipThreshold is the score threshold below which gossip propagation is supressed;
	// should be negative.
	GossipThreshold float64

	// PublishThreshold is the score threshold below which we shouldn't publish when using flood
	// publishing (also applies to fanout and floodsub peers); should be negative and <= GossipThreshold.
	PublishThreshold float64

	// GraylistThreshold is the score threshold below which message processing is supressed altogether,
	// implementing an effective graylist according to peer score; should be negative and <= PublisThreshold.
	GraylistThreshold float64

	// AcceptPXThreshold is the score threshold below which PX will be ignored; this should be positive
	// and limited to scores attainable by bootstrappers and other trusted nodes.
	AcceptPXThreshold float64

	// OpportunisticGraftThreshold is the median mesh score threshold before triggering opportunistic
	// grafting; this should have a small positive value.
	OpportunisticGraftThreshold float64
}

type PubOpt 

type PubOpt func(pub *PublishOptions) error

func WithReadiness 

func WithReadiness(ready RouterReady) PubOpt

WithReadiness returns a publishing option for only publishing when the router is ready. This option is not useful unless PubSub is also using WithDiscovery

type PubSub 

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

PubSub is the implementation of the pubsub system.

func NewFloodSub 

func NewFloodSub(ctx context.Context, h host.Host, opts ...Option) (*PubSub, error)

NewFloodSub returns a new PubSub object using the FloodSubRouter.

func NewFloodsubWithProtocols 

func NewFloodsubWithProtocols(ctx context.Context, h host.Host, ps []protocol.ID, opts ...Option) (*PubSub, error)

NewFloodsubWithProtocols returns a new floodsub-enabled PubSub objecting using the protocols specified in ps.

func NewGossipSub 

func NewGossipSub(ctx context.Context, h host.Host, opts ...Option) (*PubSub, error)

NewGossipSub returns a new PubSub object using GossipSubRouter as the router.

func NewPubSub 

func NewPubSub(ctx context.Context, h host.Host, rt PubSubRouter, opts ...Option) (*PubSub, error)

NewPubSub returns a new PubSub management object.

func NewRandomSub 

func NewRandomSub(ctx context.Context, h host.Host, size int, opts ...Option) (*PubSub, error)

NewRandomSub returns a new PubSub object using RandomSubRouter as the router.

func (*PubSub) BlacklistPeer 

func (p *PubSub) BlacklistPeer(pid peer.ID)

BlacklistPeer blacklists a peer; all messages from this peer will be unconditionally dropped.

func (*PubSub) GetTopics 

func (p *PubSub) GetTopics() []string

GetTopics returns the topics this node is subscribed to.

func (*PubSub) Join 

func (p *PubSub) Join(topic string, opts ...TopicOpt) (*Topic, error)

Join joins the topic and returns a Topic handle. Only one Topic handle should exist per topic, and Join will error if the Topic handle already exists.

func (*PubSub) ListPeers 

func (p *PubSub) ListPeers(topic string) []peer.ID

ListPeers returns a list of peers we are connected to in the given topic.

func (*PubSub) Publish deprecated 

func (p *PubSub) Publish(topic string, data []byte, opts ...PubOpt) error

Publish publishes data to the given topic.

Deprecated: use pubsub.Join() and topic.Publish() instead

func (*PubSub) RegisterTopicValidator 

func (p *PubSub) RegisterTopicValidator(topic string, val interface{}, opts ...ValidatorOpt) error

RegisterTopicValidator registers a validator for topic. By default validators are asynchronous, which means they will run in a separate goroutine. The number of active goroutines is controlled by global and per topic validator throttles; if it exceeds the throttle threshold, messages will be dropped.

func (*PubSub) Subscribe deprecated 

func (p *PubSub) Subscribe(topic string, opts ...SubOpt) (*Subscription, error)

Subscribe returns a new Subscription for the given topic. Note that subscription is not an instanteneous operation. It may take some time before the subscription is processed by the pubsub main loop and propagated to our peers.

Deprecated: use pubsub.Join() and topic.Subscribe() instead

func (*PubSub) UnregisterTopicValidator 

func (p *PubSub) UnregisterTopicValidator(topic string) error

UnregisterTopicValidator removes a validator from a topic. Returns an error if there was no validator registered with the topic.

type PubSubNotif 

type PubSubNotif PubSub

func (*PubSubNotif) ClosedStream 

func (p *PubSubNotif) ClosedStream(n network.Network, s network.Stream)

func (*PubSubNotif) Connected 

func (p *PubSubNotif) Connected(n network.Network, c network.Conn)

func (*PubSubNotif) Disconnected 

func (p *PubSubNotif) Disconnected(n network.Network, c network.Conn)

func (*PubSubNotif) Initialize 

func (p *PubSubNotif) Initialize()

func (*PubSubNotif) Listen 

func (p *PubSubNotif) Listen(n network.Network, _ ma.Multiaddr)

func (*PubSubNotif) ListenClose 

func (p *PubSubNotif) ListenClose(n network.Network, _ ma.Multiaddr)

func (*PubSubNotif) OpenedStream 

func (p *PubSubNotif) OpenedStream(n network.Network, s network.Stream)

type PubSubRouter 

type PubSubRouter interface {
	// Protocols returns the list of protocols supported by the router.
	Protocols() []protocol.ID
	// Attach is invoked by the PubSub constructor to attach the router to a
	// freshly initialized PubSub instance.
	Attach(*PubSub)
	// AddPeer notifies the router that a new peer has been connected.
	AddPeer(peer.ID, protocol.ID)
	// RemovePeer notifies the router that a peer has been disconnected.
	RemovePeer(peer.ID)
	// EnoughPeers returns whether the router needs more peers before it's ready to publish new records.
	// Suggested (if greater than 0) is a suggested number of peers that the router should need.
	EnoughPeers(topic string, suggested int) bool
	// AcceptFrom is invoked on any incoming message before pushing it to the validation pipeline
	// or processing control information.
	// Allows routers with internal scoring to vet peers before committing any processing resources
	// to the message and implement an effective graylist and react to validation queue overload.
	AcceptFrom(peer.ID) AcceptStatus
	// HandleRPC is invoked to process control messages in the RPC envelope.
	// It is invoked after subscriptions and payload messages have been processed.
	HandleRPC(*RPC)
	// Publish is invoked to forward a new message that has been validated.
	Publish(*Message)
	// Join notifies the router that we want to receive and forward messages in a topic.
	// It is invoked after the subscription announcement.
	Join(topic string)
	// Leave notifies the router that we are no longer interested in a topic.
	// It is invoked after the unsubscription announcement.
	Leave(topic string)
}

PubSubRouter is the message router component of PubSub.

type PublishOptions 

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

type RPC 

type RPC struct {
	pb.RPC
	// contains filtered or unexported fields
}

type RandomSubRouter 

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

RandomSubRouter is a router that implements a random propagation strategy. For each message, it selects the square root of the network size peers, with a min of RandomSubD, and forwards the message to them.

func (*RandomSubRouter) AcceptFrom 

func (rs *RandomSubRouter) AcceptFrom(peer.ID) AcceptStatus

func (*RandomSubRouter) AddPeer 

func (rs *RandomSubRouter) AddPeer(p peer.ID, proto protocol.ID)

func (*RandomSubRouter) Attach 

func (rs *RandomSubRouter) Attach(p *PubSub)

func (*RandomSubRouter) EnoughPeers 

func (rs *RandomSubRouter) EnoughPeers(topic string, suggested int) bool

func (*RandomSubRouter) HandleRPC 

func (rs *RandomSubRouter) HandleRPC(rpc *RPC)

func (*RandomSubRouter) Join 

func (rs *RandomSubRouter) Join(topic string)

func (*RandomSubRouter) Leave 

func (rs *RandomSubRouter) Leave(topic string)

func (*RandomSubRouter) Protocols 

func (rs *RandomSubRouter) Protocols() []protocol.ID

func (*RandomSubRouter) Publish 

func (rs *RandomSubRouter) Publish(msg *Message)

func (*RandomSubRouter) RemovePeer 

func (rs *RandomSubRouter) RemovePeer(p peer.ID)

type RawTracer 

type RawTracer interface {
	// AddPeer is invoked when a new peer is added.
	AddPeer(p peer.ID, proto protocol.ID)
	// RemovePeer is invoked when a peer is removed.
	RemovePeer(p peer.ID)
	// Join is invoked when a new topic is joined
	Join(topic string)
	// Leave is invoked when a topic is abandoned
	Leave(topic string)
	// Graft is invoked when a new peer is grafted on the mesh (gossipsub)
	Graft(p peer.ID, topic string)
	// Prune is invoked when a peer is pruned from the message (gossipsub)
	Prune(p peer.ID, topic string)
	// ValidateMessage is invoked when a message first enters the validation pipeline.
	ValidateMessage(msg *Message)
	// DeliverMessage is invoked when a message is delivered
	DeliverMessage(msg *Message)
	// RejectMessage is invoked when a message is Rejected or Ignored.
	// The reason argument can be one of the named strings Reject*.
	RejectMessage(msg *Message, reason string)
	// DuplicateMessage is invoked when a duplicate message is dropped.
	DuplicateMessage(msg *Message)
	// ThrottlePeer is invoked when a peer is throttled by the peer gater.
	ThrottlePeer(p peer.ID)
}

RawTracer is a low level tracing interace that allows an application to trace the internal operation of the pubsub subsystem.

Note that the tracers are invoked synchronously, which means that application tracers must take care to not block or modify arguments.

Warning: this interface is not fixed, we may be adding new methods as necessitated by the system in the future.

type RelayCancelFunc 

type RelayCancelFunc func()

type RemoteTracer 

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

RemoteTracer is a tracer that sends trace events to a remote peer

func NewRemoteTracer 

func NewRemoteTracer(ctx context.Context, host host.Host, pi peer.AddrInfo) (*RemoteTracer, error)

NewRemoteTracer constructs a RemoteTracer, tracing to the peer identified by pi

func (*RemoteTracer) Close 

func (t *RemoteTracer) Close()

func (*RemoteTracer) Trace 

func (t *RemoteTracer) Trace(evt *pb.TraceEvent)

type RouterReady 

type RouterReady func(rt PubSubRouter, topic string) (bool, error)

RouterReady is a function that decides if a router is ready to publish

func MinTopicSize 

func MinTopicSize(size int) RouterReady

MinTopicSize returns a function that checks if a router is ready for publishing based on the topic size. The router ultimately decides the whether it is ready or not, the given size is just a suggestion.

type SubOpt 

type SubOpt func(sub *Subscription) error

type Subscription 

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

Subscription handles the details of a particular Topic subscription. There may be many subscriptions for a given Topic.

func (*Subscription) Cancel 

func (sub *Subscription) Cancel()

Cancel closes the subscription. If this is the last active subscription then pubsub will send an unsubscribe announcement to the network.

func (*Subscription) Next 

func (sub *Subscription) Next(ctx context.Context) (*Message, error)

Next returns the next message in our subscription

func (*Subscription) Topic 

func (sub *Subscription) Topic() string

Topic returns the topic string associated with the Subscription

type SubscriptionFilter 

type SubscriptionFilter interface {
	// CanSubscribe returns true if the topic is of interest and we can subscribe to it
	CanSubscribe(topic string) bool

	// FilterIncomingSubscriptions is invoked for all RPCs containing subscription notifications.
	// It should filter only the subscriptions of interest and my return an error if (for instance)
	// there are too many subscriptions.
	FilterIncomingSubscriptions(peer.ID, []*pb.RPC_SubOpts) ([]*pb.RPC_SubOpts, error)
}

SubscriptionFilter is a function that tells us whether we are interested in allowing and tracking subscriptions for a given topic.

The filter is consulted whenever a subscription notification is received by another peer; if the filter returns false, then the notification is ignored.

The filter is also consulted when joining topics; if the filter returns false, then the Join operation will result in an error.

func NewAllowlistSubscriptionFilter 

func NewAllowlistSubscriptionFilter(topics ...string) SubscriptionFilter

NewAllowlistSubscriptionFilter creates a subscription filter that only allows explicitly specified topics for local subscriptions and incoming peer subscriptions.

func NewRegexpSubscriptionFilter 

func NewRegexpSubscriptionFilter(rx *regexp.Regexp) SubscriptionFilter

NewRegexpSubscriptionFilter creates a subscription filter that only allows topics that match a regular expression for local subscriptions and incoming peer subscriptions.

Warning: the user should take care to match start/end of string in the supplied regular expression, otherwise the filter might match unwanted topics unexpectedly.

func WrapLimitSubscriptionFilter 

func WrapLimitSubscriptionFilter(filter SubscriptionFilter, limit int) SubscriptionFilter

WrapLimitSubscriptionFilter wraps a subscription filter with a hard limit in the number of subscriptions allowed in an RPC message.

type TimeCachedBlacklist 

type TimeCachedBlacklist struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

TimeCachedBlacklist is a blacklist implementation using a time cache

func (*TimeCachedBlacklist) Add 

func (b *TimeCachedBlacklist) Add(p peer.ID) bool

Add returns a bool saying whether Add of peer was successful

func (*TimeCachedBlacklist) Contains 

func (b *TimeCachedBlacklist) Contains(p peer.ID) bool

type Topic 

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

Topic is the handle for a pubsub topic

func (*Topic) Close 

func (t *Topic) Close() error

Close closes down the topic. Will return an error unless there are no active event handlers or subscriptions. Does not error if the topic is already closed.

func (*Topic) EventHandler 

func (t *Topic) EventHandler(opts ...TopicEventHandlerOpt) (*TopicEventHandler, error)

EventHandler creates a handle for topic specific events Multiple event handlers may be created and will operate independently of each other

func (*Topic) ListPeers 

func (t *Topic) ListPeers() []peer.ID

ListPeers returns a list of peers we are connected to in the given topic.

func (*Topic) Publish 

func (t *Topic) Publish(ctx context.Context, data []byte, opts ...PubOpt) error

Publish publishes data to topic.

func (*Topic) Relay 

func (t *Topic) Relay() (RelayCancelFunc, error)

Relay enables message relaying for the topic and returns a reference cancel function. Subsequent calls increase the reference counter. To completely disable the relay, all references must be cancelled.

func (*Topic) SetScoreParams 

func (t *Topic) SetScoreParams(p *TopicScoreParams) error

SetScoreParams sets the topic score parameters if the pubsub router supports peer scoring

func (*Topic) String 

func (t *Topic) String() string

String returns the topic associated with t

func (*Topic) Subscribe 

func (t *Topic) Subscribe(opts ...SubOpt) (*Subscription, error)

Subscribe returns a new Subscription for the topic. Note that subscription is not an instanteneous operation. It may take some time before the subscription is processed by the pubsub main loop and propagated to our peers.

type TopicEventHandler 

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

TopicEventHandler is used to manage topic specific events. No Subscription is required to receive events.

func (*TopicEventHandler) Cancel 

func (t *TopicEventHandler) Cancel()

Cancel closes the topic event handler

func (*TopicEventHandler) NextPeerEvent 

func (t *TopicEventHandler) NextPeerEvent(ctx context.Context) (PeerEvent, error)

NextPeerEvent returns the next event regarding subscribed peers Guarantees: Peer Join and Peer Leave events for a given peer will fire in order. Unless a peer both Joins and Leaves before NextPeerEvent emits either event all events will eventually be received from NextPeerEvent.

type TopicEventHandlerOpt 

type TopicEventHandlerOpt func(t *TopicEventHandler) error

type TopicOpt 

type TopicOpt func(t *Topic) error

type TopicOptions 

type TopicOptions struct{}

type TopicScoreParams 

type TopicScoreParams struct {
	// The weight of the topic.
	TopicWeight float64

	// P1: time in the mesh
	// This is the time the peer has ben grafted in the mesh.
	// The value of of the parameter is the time/TimeInMeshQuantum, capped by TimeInMeshCap
	// The weight of the parameter MUST be positive (or zero to disable).
	TimeInMeshWeight  float64
	TimeInMeshQuantum time.Duration
	TimeInMeshCap     float64

	// P2: first message deliveries
	// This is the number of message deliveries in the topic.
	// The value of the parameter is a counter, decaying with FirstMessageDeliveriesDecay, and capped
	// by FirstMessageDeliveriesCap.
	// The weight of the parameter MUST be positive (or zero to disable).
	FirstMessageDeliveriesWeight, FirstMessageDeliveriesDecay float64
	FirstMessageDeliveriesCap                                 float64

	// P3: mesh message deliveries
	// This is the number of message deliveries in the mesh, within the MeshMessageDeliveriesWindow of
	// message validation; deliveries during validation also count and are retroactively applied
	// when validation succeeds.
	// This window accounts for the minimum time before a hostile mesh peer trying to game the score
	// could replay back a valid message we just sent them.
	// It effectively tracks first and near-first deliveries, ie a message seen from a mesh peer
	// before we have forwarded it to them.
	// The parameter has an associated counter, decaying with MeshMessageDeliveriesDecay.
	// If the counter exceeds the threshold, its value is 0.
	// If the counter is below the MeshMessageDeliveriesThreshold, the value is the square of
	// the deficit, ie (MessageDeliveriesThreshold - counter)^2
	// The penalty is only activated after MeshMessageDeliveriesActivation time in the mesh.
	// The weight of the parameter MUST be negative (or zero to disable).
	MeshMessageDeliveriesWeight, MeshMessageDeliveriesDecay      float64
	MeshMessageDeliveriesCap, MeshMessageDeliveriesThreshold     float64
	MeshMessageDeliveriesWindow, MeshMessageDeliveriesActivation time.Duration

	// P3b: sticky mesh propagation failures
	// This is a sticky penalty that applies when a peer gets pruned from the mesh with an active
	// mesh message delivery penalty.
	// The weight of the parameter MUST be negative (or zero to disable)
	MeshFailurePenaltyWeight, MeshFailurePenaltyDecay float64

	// P4: invalid messages
	// This is the number of invalid messages in the topic.
	// The value of the parameter is the square of the counter, decaying with
	// InvalidMessageDeliveriesDecay.
	// The weight of the parameter MUST be negative (or zero to disable).
	InvalidMessageDeliveriesWeight, InvalidMessageDeliveriesDecay float64
}

type TopicScoreSnapshot 

type TopicScoreSnapshot struct {
	TimeInMesh               time.Duration
	FirstMessageDeliveries   float64
	MeshMessageDeliveries    float64
	InvalidMessageDeliveries float64
}

type ValidationError 

type ValidationError struct {
	Reason string
}

ValidationError is an error that may be signalled from message publication when the message fails validation

func (ValidationError) Error 

func (e ValidationError) Error() string

type ValidationResult 

type ValidationResult int

ValidationResult represents the decision of an extended validator

type Validator 

type Validator func(context.Context, peer.ID, *Message) bool

Validator is a function that validates a message with a binary decision: accept or reject.

type ValidatorEx 

type ValidatorEx func(context.Context, peer.ID, *Message) ValidationResult

ValidatorEx is an extended validation function that validates a message with an enumerated decision

type ValidatorOpt 

type ValidatorOpt func(addVal *addValReq) error

ValidatorOpt is an option for RegisterTopicValidator.

func WithValidatorConcurrency 

func WithValidatorConcurrency(n int) ValidatorOpt

WithValidatorConcurrency is an option that sets the topic validator throttle. This controls the number of active validation goroutines for the topic; the default is 1024.

func WithValidatorInline 

func WithValidatorInline(inline bool) ValidatorOpt

WithValidatorInline is an option that sets the validation disposition to synchronous: it will be executed inline in validation front-end, without spawning a new goroutine. This is suitable for simple or cpu-bound validators that do not block.

func WithValidatorTimeout 

func WithValidatorTimeout(timeout time.Duration) ValidatorOpt

WithValidatorTimeout is an option that sets a timeout for an (asynchronous) topic validator. By default there is no timeout in asynchronous validators.

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