mirror of https://github.com/vacp2p/nim-libp2p.git
610 lines
22 KiB
Nim
610 lines
22 KiB
Nim
## Nim-LibP2P
|
|
## Copyright (c) 2021 Status Research & Development GmbH
|
|
## Licensed under either of
|
|
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
|
|
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
|
|
## at your option.
|
|
## This file may not be copied, modified, or distributed except according to
|
|
## those terms.
|
|
|
|
# {.push raises: [Defect].} TODO compile error on windows due to chronicles?
|
|
|
|
import std/[tables, sequtils, sets, algorithm]
|
|
import random # for shuffle
|
|
import chronos, chronicles, metrics
|
|
import "."/[types, scoring]
|
|
import ".."/[pubsubpeer, peertable, timedcache, mcache, pubsub]
|
|
import "../rpc"/[messages]
|
|
import "../../.."/[peerid, multiaddress, utility, switch]
|
|
|
|
declareGauge(libp2p_gossipsub_cache_window_size, "the number of messages in the cache")
|
|
declareGauge(libp2p_gossipsub_peers_per_topic_mesh, "gossipsub peers per topic in mesh", labels = ["topic"])
|
|
declareGauge(libp2p_gossipsub_peers_per_topic_fanout, "gossipsub peers per topic in fanout", labels = ["topic"])
|
|
declareGauge(libp2p_gossipsub_peers_per_topic_gossipsub, "gossipsub peers per topic in gossipsub", labels = ["topic"])
|
|
declareGauge(libp2p_gossipsub_under_dout_topics, "number of topics below dout")
|
|
declareGauge(libp2p_gossipsub_no_peers_topics, "number of topics in mesh with no peers")
|
|
declareGauge(libp2p_gossipsub_low_peers_topics, "number of topics in mesh with at least one but below dlow peers")
|
|
declareGauge(libp2p_gossipsub_healthy_peers_topics, "number of topics in mesh with at least dlow peers (but below dhigh)")
|
|
declareCounter(libp2p_gossipsub_above_dhigh_condition, "number of above dhigh pruning branches ran", labels = ["topic"])
|
|
|
|
proc grafted*(g: GossipSub, p: PubSubPeer, topic: string) {.raises: [Defect].} =
|
|
g.withPeerStats(p.peerId) do (stats: var PeerStats):
|
|
var info = stats.topicInfos.getOrDefault(topic)
|
|
info.graftTime = Moment.now()
|
|
info.meshTime = 0.seconds
|
|
info.inMesh = true
|
|
info.meshMessageDeliveriesActive = false
|
|
|
|
stats.topicInfos[topic] = info
|
|
|
|
trace "grafted", peer=p, topic
|
|
|
|
proc pruned*(g: GossipSub, p: PubSubPeer, topic: string) {.raises: [Defect].} =
|
|
let backoff = Moment.fromNow(g.parameters.pruneBackoff)
|
|
g.backingOff
|
|
.mgetOrPut(topic, initTable[PeerID, Moment]())[p.peerId] = backoff
|
|
|
|
g.peerStats.withValue(p.peerId, stats):
|
|
stats.topicInfos.withValue(topic, info):
|
|
g.topicParams.withValue(topic, topicParams):
|
|
# penalize a peer that delivered no message
|
|
let threshold = topicParams[].meshMessageDeliveriesThreshold
|
|
if info[].inMesh and
|
|
info[].meshMessageDeliveriesActive and
|
|
info[].meshMessageDeliveries < threshold:
|
|
let deficit = threshold - info.meshMessageDeliveries
|
|
info[].meshFailurePenalty += deficit * deficit
|
|
|
|
info.inMesh = false
|
|
|
|
trace "pruned", peer=p, topic
|
|
|
|
proc handleBackingOff*(t: var BackoffTable, topic: string) {.raises: [Defect].} =
|
|
let now = Moment.now()
|
|
var expired = toSeq(t.getOrDefault(topic).pairs())
|
|
expired.keepIf do (pair: tuple[peer: PeerID, expire: Moment]) -> bool:
|
|
now >= pair.expire
|
|
for (peer, _) in expired:
|
|
t.withValue(topic, v):
|
|
v[].del(peer)
|
|
|
|
proc peerExchangeList*(g: GossipSub, topic: string): seq[PeerInfoMsg] {.raises: [Defect].} =
|
|
var peers = g.gossipsub.getOrDefault(topic, initHashSet[PubSubPeer]()).toSeq()
|
|
peers.keepIf do (x: PubSubPeer) -> bool:
|
|
x.score >= 0.0
|
|
# by spec, larger then Dhi, but let's put some hard caps
|
|
peers.setLen(min(peers.len, g.parameters.dHigh * 2))
|
|
peers.map do (x: PubSubPeer) -> PeerInfoMsg:
|
|
PeerInfoMsg(peerID: x.peerId.getBytes())
|
|
|
|
proc handleGraft*(g: GossipSub,
|
|
peer: PubSubPeer,
|
|
grafts: seq[ControlGraft]): seq[ControlPrune] = # {.raises: [Defect].} TODO chronicles exception on windows
|
|
for graft in grafts:
|
|
let topic = graft.topicID
|
|
trace "peer grafted topic", peer, topic
|
|
|
|
# It is an error to GRAFT on a explicit peer
|
|
if peer.peerId in g.parameters.directPeers:
|
|
# receiving a graft from a direct peer should yield a more prominent warning (protocol violation)
|
|
warn "attempt to graft an explicit peer, peering agreements should be reciprocal",
|
|
peer, topic
|
|
# and such an attempt should be logged and rejected with a PRUNE
|
|
result.add(ControlPrune(
|
|
topicID: topic,
|
|
peers: @[], # omitting heavy computation here as the remote did something illegal
|
|
backoff: g.parameters.pruneBackoff.seconds.uint64))
|
|
|
|
let backoff = Moment.fromNow(g.parameters.pruneBackoff)
|
|
g.backingOff
|
|
.mgetOrPut(topic, initTable[PeerID, Moment]())[peer.peerId] = backoff
|
|
|
|
peer.behaviourPenalty += 0.1
|
|
|
|
continue
|
|
|
|
if g.backingOff
|
|
.getOrDefault(topic)
|
|
.getOrDefault(peer.peerId) > Moment.now():
|
|
debug "attempt to graft a backingOff peer", peer, topic
|
|
# and such an attempt should be logged and rejected with a PRUNE
|
|
result.add(ControlPrune(
|
|
topicID: topic,
|
|
peers: @[], # omitting heavy computation here as the remote did something illegal
|
|
backoff: g.parameters.pruneBackoff.seconds.uint64))
|
|
|
|
let backoff = Moment.fromNow(g.parameters.pruneBackoff)
|
|
g.backingOff
|
|
.mgetOrPut(topic, initTable[PeerID, Moment]())[peer.peerId] = backoff
|
|
|
|
peer.behaviourPenalty += 0.1
|
|
|
|
continue
|
|
|
|
# not in the spec exactly, but let's avoid way too low score peers
|
|
# other clients do it too also was an audit recommendation
|
|
if peer.score < g.parameters.publishThreshold:
|
|
continue
|
|
|
|
# If they send us a graft before they send us a subscribe, what should
|
|
# we do? For now, we add them to mesh but don't add them to gossipsub.
|
|
if topic in g.topics:
|
|
if g.mesh.peers(topic) < g.parameters.dHigh or peer.outbound:
|
|
# In the spec, there's no mention of DHi here, but implicitly, a
|
|
# peer will be removed from the mesh on next rebalance, so we don't want
|
|
# this peer to push someone else out
|
|
if g.mesh.addPeer(topic, peer):
|
|
g.grafted(peer, topic)
|
|
g.fanout.removePeer(topic, peer)
|
|
else:
|
|
trace "peer already in mesh", peer, topic
|
|
else:
|
|
trace "pruning grafting peer, mesh full",
|
|
peer, topic, score = peer.score, mesh = g.mesh.peers(topic)
|
|
result.add(ControlPrune(
|
|
topicID: topic,
|
|
peers: g.peerExchangeList(topic),
|
|
backoff: g.parameters.pruneBackoff.seconds.uint64))
|
|
else:
|
|
trace "peer grafting topic we're not interested in", peer, topic
|
|
# gossip 1.1, we do not send a control message prune anymore
|
|
|
|
proc handlePrune*(g: GossipSub, peer: PubSubPeer, prunes: seq[ControlPrune]) {.raises: [Defect].} =
|
|
for prune in prunes:
|
|
let topic = prune.topicID
|
|
|
|
trace "peer pruned topic", peer, topic
|
|
|
|
# add peer backoff
|
|
if prune.backoff > 0:
|
|
let
|
|
# avoid overflows and follow params
|
|
# worst case if the remote thinks we are wrong we get penalized
|
|
# but we won't end up with ghost peers
|
|
backoffSeconds = clamp(
|
|
prune.backoff + BackoffSlackTime,
|
|
0'u64,
|
|
g.parameters.pruneBackoff.seconds.uint64 + BackoffSlackTime
|
|
)
|
|
backoff = Moment.fromNow(backoffSeconds.int64.seconds)
|
|
current = g.backingOff.getOrDefault(topic).getOrDefault(peer.peerId)
|
|
if backoff > current:
|
|
g.backingOff
|
|
.mgetOrPut(topic, initTable[PeerID, Moment]())[peer.peerId] = backoff
|
|
|
|
trace "pruning rpc received peer", peer, score = peer.score
|
|
g.pruned(peer, topic)
|
|
g.mesh.removePeer(topic, peer)
|
|
|
|
# TODO peer exchange, we miss ambient peer discovery in libp2p, so we are blocked by that
|
|
# another option could be to implement signed peer records
|
|
## if peer.score > g.parameters.gossipThreshold and prunes.peers.len > 0:
|
|
|
|
proc handleIHave*(g: GossipSub,
|
|
peer: PubSubPeer,
|
|
ihaves: seq[ControlIHave]): ControlIWant {.raises: [Defect].} =
|
|
if peer.score < g.parameters.gossipThreshold:
|
|
trace "ihave: ignoring low score peer", peer, score = peer.score
|
|
elif peer.iHaveBudget <= 0:
|
|
trace "ihave: ignoring out of budget peer", peer, score = peer.score
|
|
else:
|
|
# TODO review deduplicate algorithm
|
|
# * https://github.com/nim-lang/Nim/blob/5f46474555ee93306cce55342e81130c1da79a42/lib/pure/collections/sequtils.nim#L184
|
|
# * it's probably not efficient and might give preference to the first dupe
|
|
let deIhaves = ihaves.deduplicate()
|
|
for ihave in deIhaves:
|
|
trace "peer sent ihave",
|
|
peer, topic = ihave.topicID, msgs = ihave.messageIDs
|
|
if ihave.topicID in g.mesh:
|
|
# also avoid duplicates here!
|
|
let deIhavesMsgs = ihave.messageIDs.deduplicate()
|
|
for m in deIhavesMsgs:
|
|
let msgId = m & g.randomBytes
|
|
if msgId notin g.seen:
|
|
if peer.iHaveBudget > 0:
|
|
result.messageIDs.add(m)
|
|
dec peer.iHaveBudget
|
|
else:
|
|
return
|
|
|
|
# shuffling result.messageIDs before sending it out to increase the likelihood
|
|
# of getting an answer if the peer truncates the list due to internal size restrictions.
|
|
shuffle(result.messageIDs)
|
|
|
|
proc handleIWant*(g: GossipSub,
|
|
peer: PubSubPeer,
|
|
iwants: seq[ControlIWant]): seq[Message] {.raises: [Defect].} =
|
|
if peer.score < g.parameters.gossipThreshold:
|
|
trace "iwant: ignoring low score peer", peer, score = peer.score
|
|
elif peer.iWantBudget <= 0:
|
|
trace "iwant: ignoring out of budget peer", peer, score = peer.score
|
|
else:
|
|
let deIwants = iwants.deduplicate()
|
|
for iwant in deIwants:
|
|
let deIwantsMsgs = iwant.messageIDs.deduplicate()
|
|
for mid in deIwantsMsgs:
|
|
trace "peer sent iwant", peer, messageID = mid
|
|
let msg = g.mcache.get(mid)
|
|
if msg.isSome:
|
|
# avoid spam
|
|
if peer.iWantBudget > 0:
|
|
result.add(msg.get())
|
|
dec peer.iWantBudget
|
|
else:
|
|
return
|
|
|
|
proc commitMetrics(metrics: var MeshMetrics) {.raises: [Defect].} =
|
|
libp2p_gossipsub_low_peers_topics.set(metrics.lowPeersTopics)
|
|
libp2p_gossipsub_no_peers_topics.set(metrics.noPeersTopics)
|
|
libp2p_gossipsub_under_dout_topics.set(metrics.underDoutTopics)
|
|
libp2p_gossipsub_healthy_peers_topics.set(metrics.healthyPeersTopics)
|
|
libp2p_gossipsub_peers_per_topic_gossipsub.set(metrics.otherPeersPerTopicGossipsub, labelValues = ["other"])
|
|
libp2p_gossipsub_peers_per_topic_fanout.set(metrics.otherPeersPerTopicFanout, labelValues = ["other"])
|
|
libp2p_gossipsub_peers_per_topic_mesh.set(metrics.otherPeersPerTopicMesh, labelValues = ["other"])
|
|
|
|
proc rebalanceMesh*(g: GossipSub, topic: string, metrics: ptr MeshMetrics = nil) {.raises: [Defect].} =
|
|
logScope:
|
|
topic
|
|
mesh = g.mesh.peers(topic)
|
|
gossipsub = g.gossipsub.peers(topic)
|
|
|
|
trace "rebalancing mesh"
|
|
|
|
# create a mesh topic that we're subscribing to
|
|
|
|
var
|
|
prunes, grafts: seq[PubSubPeer]
|
|
npeers = g.mesh.peers(topic)
|
|
|
|
if npeers < g.parameters.dLow:
|
|
trace "replenishing mesh", peers = npeers
|
|
# replenish the mesh if we're below Dlo
|
|
var candidates = toSeq(
|
|
g.gossipsub.getOrDefault(topic, initHashSet[PubSubPeer]()) -
|
|
g.mesh.getOrDefault(topic, initHashSet[PubSubPeer]())
|
|
).filterIt(
|
|
it.connected and
|
|
# avoid negative score peers
|
|
it.score >= 0.0 and
|
|
# don't pick explicit peers
|
|
it.peerId notin g.parameters.directPeers and
|
|
# and avoid peers we are backing off
|
|
it.peerId notin g.backingOff.getOrDefault(topic)
|
|
)
|
|
|
|
# shuffle anyway, score might be not used
|
|
shuffle(candidates)
|
|
|
|
# sort peers by score, high score first since we graft
|
|
candidates.sort(byScore, SortOrder.Descending)
|
|
|
|
# Graft peers so we reach a count of D
|
|
candidates.setLen(min(candidates.len, g.parameters.d - npeers))
|
|
|
|
trace "grafting", grafting = candidates.len
|
|
|
|
if candidates.len > 0:
|
|
for peer in candidates:
|
|
if g.mesh.addPeer(topic, peer):
|
|
g.grafted(peer, topic)
|
|
g.fanout.removePeer(topic, peer)
|
|
grafts &= peer
|
|
|
|
else:
|
|
trace "replenishing mesh outbound quota", peers = g.mesh.peers(topic)
|
|
|
|
var candidates = toSeq(
|
|
g.gossipsub.getOrDefault(topic, initHashSet[PubSubPeer]()) -
|
|
g.mesh.getOrDefault(topic, initHashSet[PubSubPeer]())
|
|
).filterIt(
|
|
it.connected and
|
|
# get only outbound ones
|
|
it.outbound and
|
|
# avoid negative score peers
|
|
it.score >= 0.0 and
|
|
# don't pick explicit peers
|
|
it.peerId notin g.parameters.directPeers and
|
|
# and avoid peers we are backing off
|
|
it.peerId notin g.backingOff.getOrDefault(topic)
|
|
)
|
|
|
|
# shuffle anyway, score might be not used
|
|
shuffle(candidates)
|
|
|
|
# sort peers by score, high score first, we are grafting
|
|
candidates.sort(byScore, SortOrder.Descending)
|
|
|
|
# Graft peers so we reach a count of D
|
|
candidates.setLen(min(candidates.len, g.parameters.dOut))
|
|
|
|
trace "grafting outbound peers", topic, peers = candidates.len
|
|
|
|
for peer in candidates:
|
|
if g.mesh.addPeer(topic, peer):
|
|
g.grafted(peer, topic)
|
|
g.fanout.removePeer(topic, peer)
|
|
grafts &= peer
|
|
|
|
|
|
# get again npeers after possible grafts
|
|
npeers = g.mesh.peers(topic)
|
|
if npeers > g.parameters.dHigh:
|
|
if not isNil(metrics):
|
|
if g.knownTopics.contains(topic):
|
|
libp2p_gossipsub_above_dhigh_condition.inc(labelValues = [topic])
|
|
else:
|
|
libp2p_gossipsub_above_dhigh_condition.inc(labelValues = ["other"])
|
|
|
|
# prune peers if we've gone over Dhi
|
|
prunes = toSeq(try: g.mesh[topic] except KeyError: raiseAssert "have peers")
|
|
# avoid pruning peers we are currently grafting in this heartbeat
|
|
prunes.keepIf do (x: PubSubPeer) -> bool: x notin grafts
|
|
|
|
# shuffle anyway, score might be not used
|
|
shuffle(prunes)
|
|
|
|
# sort peers by score (inverted), pruning, so low score peers are on top
|
|
prunes.sort(byScore, SortOrder.Ascending)
|
|
|
|
# keep high score peers
|
|
if prunes.len > g.parameters.dScore:
|
|
prunes.setLen(prunes.len - g.parameters.dScore)
|
|
|
|
# collect inbound/outbound info
|
|
var outbound: seq[PubSubPeer]
|
|
var inbound: seq[PubSubPeer]
|
|
for peer in prunes:
|
|
if peer.outbound:
|
|
outbound &= peer
|
|
else:
|
|
inbound &= peer
|
|
|
|
let
|
|
meshOutbound = prunes.countIt(it.outbound)
|
|
maxOutboundPrunes = meshOutbound - g.parameters.dOut
|
|
|
|
# ensure that there are at least D_out peers first and rebalance to g.d after that
|
|
outbound.setLen(min(outbound.len, max(0, maxOutboundPrunes)))
|
|
|
|
# concat remaining outbound peers
|
|
prunes = inbound & outbound
|
|
|
|
let pruneLen = prunes.len - g.parameters.d
|
|
if pruneLen > 0:
|
|
# Ok we got some peers to prune,
|
|
# for this heartbeat let's prune those
|
|
shuffle(prunes)
|
|
prunes.setLen(pruneLen)
|
|
|
|
trace "pruning", prunes = prunes.len
|
|
for peer in prunes:
|
|
trace "pruning peer on rebalance", peer, score = peer.score
|
|
g.pruned(peer, topic)
|
|
g.mesh.removePeer(topic, peer)
|
|
|
|
# opportunistic grafting, by spec mesh should not be empty...
|
|
if g.mesh.peers(topic) > 1:
|
|
var peers = toSeq(try: g.mesh[topic] except KeyError: raiseAssert "have peers")
|
|
# grafting so high score has priority
|
|
peers.sort(byScore, SortOrder.Descending)
|
|
let medianIdx = peers.len div 2
|
|
let median = peers[medianIdx]
|
|
if median.score < g.parameters.opportunisticGraftThreshold:
|
|
trace "median score below opportunistic threshold", score = median.score
|
|
var avail = toSeq(
|
|
g.gossipsub.getOrDefault(topic, initHashSet[PubSubPeer]()) -
|
|
g.mesh.getOrDefault(topic, initHashSet[PubSubPeer]())
|
|
)
|
|
|
|
avail.keepIf do (x: PubSubPeer) -> bool:
|
|
# avoid negative score peers
|
|
x.score >= median.score and
|
|
# don't pick explicit peers
|
|
x.peerId notin g.parameters.directPeers and
|
|
# and avoid peers we are backing off
|
|
x.peerId notin g.backingOff.getOrDefault(topic)
|
|
|
|
# by spec, grab only 2
|
|
if avail.len > 2:
|
|
avail.setLen(2)
|
|
|
|
for peer in avail:
|
|
if g.mesh.addPeer(topic, peer):
|
|
g.grafted(peer, topic)
|
|
grafts &= peer
|
|
trace "opportunistic grafting", peer
|
|
|
|
if not isNil(metrics):
|
|
npeers = g.mesh.peers(topic)
|
|
if npeers == 0:
|
|
inc metrics[].noPeersTopics
|
|
elif npeers < g.parameters.dLow:
|
|
inc metrics[].lowPeersTopics
|
|
else:
|
|
inc metrics[].healthyPeersTopics
|
|
|
|
var meshPeers = toSeq(g.mesh.getOrDefault(topic, initHashSet[PubSubPeer]()))
|
|
meshPeers.keepIf do (x: PubSubPeer) -> bool: x.outbound
|
|
if meshPeers.len < g.parameters.dOut:
|
|
inc metrics[].underDoutTopics
|
|
|
|
if g.knownTopics.contains(topic):
|
|
libp2p_gossipsub_peers_per_topic_gossipsub
|
|
.set(g.gossipsub.peers(topic).int64, labelValues = [topic])
|
|
libp2p_gossipsub_peers_per_topic_fanout
|
|
.set(g.fanout.peers(topic).int64, labelValues = [topic])
|
|
libp2p_gossipsub_peers_per_topic_mesh
|
|
.set(g.mesh.peers(topic).int64, labelValues = [topic])
|
|
else:
|
|
metrics[].otherPeersPerTopicGossipsub += g.gossipsub.peers(topic).int64
|
|
metrics[].otherPeersPerTopicFanout += g.fanout.peers(topic).int64
|
|
metrics[].otherPeersPerTopicMesh += g.mesh.peers(topic).int64
|
|
|
|
trace "mesh balanced"
|
|
|
|
# Send changes to peers after table updates to avoid stale state
|
|
if grafts.len > 0:
|
|
let graft = RPCMsg(control: some(ControlMessage(graft: @[ControlGraft(topicID: topic)])))
|
|
g.broadcast(grafts, graft)
|
|
if prunes.len > 0:
|
|
let prune = RPCMsg(control: some(ControlMessage(
|
|
prune: @[ControlPrune(
|
|
topicID: topic,
|
|
peers: g.peerExchangeList(topic),
|
|
backoff: g.parameters.pruneBackoff.seconds.uint64)])))
|
|
g.broadcast(prunes, prune)
|
|
|
|
proc dropFanoutPeers*(g: GossipSub) {.raises: [Defect].} =
|
|
# drop peers that we haven't published to in
|
|
# GossipSubFanoutTTL seconds
|
|
let now = Moment.now()
|
|
var drops: seq[string]
|
|
for topic, val in g.lastFanoutPubSub:
|
|
if now > val:
|
|
g.fanout.del(topic)
|
|
drops.add topic
|
|
trace "dropping fanout topic", topic
|
|
for topic in drops:
|
|
g.lastFanoutPubSub.del topic
|
|
|
|
proc replenishFanout*(g: GossipSub, topic: string) {.raises: [Defect].} =
|
|
## get fanout peers for a topic
|
|
logScope: topic
|
|
trace "about to replenish fanout"
|
|
|
|
if g.fanout.peers(topic) < g.parameters.dLow:
|
|
trace "replenishing fanout", peers = g.fanout.peers(topic)
|
|
for peer in g.gossipsub.getOrDefault(topic):
|
|
if g.fanout.addPeer(topic, peer):
|
|
if g.fanout.peers(topic) == g.parameters.d:
|
|
break
|
|
|
|
trace "fanout replenished with peers", peers = g.fanout.peers(topic)
|
|
|
|
proc getGossipPeers*(g: GossipSub): Table[PubSubPeer, ControlMessage] {.raises: [Defect].} =
|
|
## gossip iHave messages to peers
|
|
##
|
|
|
|
var cacheWindowSize = 0
|
|
|
|
trace "getting gossip peers (iHave)"
|
|
let topics = toHashSet(toSeq(g.mesh.keys)) + toHashSet(toSeq(g.fanout.keys))
|
|
for topic in topics:
|
|
if topic notin g.gossipsub:
|
|
trace "topic not in gossip array, skipping", topicID = topic
|
|
continue
|
|
|
|
let mids = g.mcache.window(topic)
|
|
if not(mids.len > 0):
|
|
continue
|
|
|
|
var midsSeq = toSeq(mids)
|
|
|
|
cacheWindowSize += midsSeq.len
|
|
|
|
# not in spec
|
|
# similar to rust: https://github.com/sigp/rust-libp2p/blob/f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c/protocols/gossipsub/src/behaviour.rs#L2101
|
|
# and go https://github.com/libp2p/go-libp2p-pubsub/blob/08c17398fb11b2ab06ca141dddc8ec97272eb772/gossipsub.go#L582
|
|
if midsSeq.len > IHaveMaxLength:
|
|
shuffle(midsSeq)
|
|
midsSeq.setLen(IHaveMaxLength)
|
|
|
|
let
|
|
ihave = ControlIHave(topicID: topic, messageIDs: midsSeq)
|
|
mesh = g.mesh.getOrDefault(topic)
|
|
fanout = g.fanout.getOrDefault(topic)
|
|
gossipPeers = mesh + fanout
|
|
var allPeers = toSeq(g.gossipsub.getOrDefault(topic))
|
|
|
|
allPeers.keepIf do (x: PubSubPeer) -> bool:
|
|
x.peerId notin g.parameters.directPeers and
|
|
x notin gossipPeers and
|
|
x.score >= g.parameters.gossipThreshold
|
|
|
|
var target = g.parameters.dLazy
|
|
let factor = (g.parameters.gossipFactor.float * allPeers.len.float).int
|
|
if factor > target:
|
|
target = min(factor, allPeers.len)
|
|
|
|
if target < allPeers.len:
|
|
shuffle(allPeers)
|
|
allPeers.setLen(target)
|
|
|
|
for peer in allPeers:
|
|
result.mGetOrPut(peer, ControlMessage()).ihave.add(ihave)
|
|
|
|
libp2p_gossipsub_cache_window_size.set(cacheWindowSize.int64)
|
|
|
|
proc onHeartbeat(g: GossipSub) {.raises: [Defect].} =
|
|
# reset IWANT budget
|
|
# reset IHAVE cap
|
|
block:
|
|
for peer in g.peers.values:
|
|
peer.iWantBudget = IWantPeerBudget
|
|
peer.iHaveBudget = IHavePeerBudget
|
|
|
|
g.updateScores()
|
|
|
|
var meshMetrics = MeshMetrics()
|
|
|
|
for t in toSeq(g.topics.keys):
|
|
# remove expired backoffs
|
|
block:
|
|
handleBackingOff(g.backingOff, t)
|
|
|
|
# prune every negative score peer
|
|
# do this before relance
|
|
# in order to avoid grafted -> pruned in the same cycle
|
|
let meshPeers = g.mesh.getOrDefault(t)
|
|
var prunes: seq[PubSubPeer]
|
|
for peer in meshPeers:
|
|
if peer.score < 0.0:
|
|
trace "pruning negative score peer", peer, score = peer.score
|
|
g.pruned(peer, t)
|
|
g.mesh.removePeer(t, peer)
|
|
prunes &= peer
|
|
if prunes.len > 0:
|
|
let prune = RPCMsg(control: some(ControlMessage(
|
|
prune: @[ControlPrune(
|
|
topicID: t,
|
|
peers: g.peerExchangeList(t),
|
|
backoff: g.parameters.pruneBackoff.seconds.uint64)])))
|
|
g.broadcast(prunes, prune)
|
|
|
|
# pass by ptr in order to both signal we want to update metrics
|
|
# and as well update the struct for each topic during this iteration
|
|
g.rebalanceMesh(t, addr meshMetrics)
|
|
|
|
commitMetrics(meshMetrics)
|
|
|
|
g.dropFanoutPeers()
|
|
|
|
# replenish known topics to the fanout
|
|
for t in toSeq(g.fanout.keys):
|
|
g.replenishFanout(t)
|
|
|
|
let peers = g.getGossipPeers()
|
|
for peer, control in peers:
|
|
# only ihave from here
|
|
for ihave in control.ihave:
|
|
if g.knownTopics.contains(ihave.topicID):
|
|
libp2p_pubsub_broadcast_ihave.inc(labelValues = [ihave.topicID])
|
|
else:
|
|
libp2p_pubsub_broadcast_ihave.inc(labelValues = ["generic"])
|
|
g.send(peer, RPCMsg(control: some(control)))
|
|
|
|
g.mcache.shift() # shift the cache
|
|
|
|
# {.pop.} # raises [Defect]
|
|
|
|
proc heartbeat*(g: GossipSub) {.async.} =
|
|
while g.heartbeatRunning:
|
|
trace "running heartbeat", instance = cast[int](g)
|
|
g.onHeartbeat()
|
|
|
|
for trigger in g.heartbeatEvents:
|
|
trace "firing heartbeat event", instance = cast[int](g)
|
|
trigger.fire()
|
|
|
|
await sleepAsync(g.parameters.heartbeatInterval)
|