576 lines
20 KiB
Nim
576 lines
20 KiB
Nim
## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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import std/[tables, sets, options, sequtils, random]
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import chronos, chronicles, metrics
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import ./pubsub,
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./floodsub,
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./pubsubpeer,
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./peertable,
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./mcache,
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./timedcache,
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./rpc/[messages, message],
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../protocol,
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../../stream/connection,
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../../peerinfo,
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../../peerid,
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../../utility,
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../../switch
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import stew/results
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export results
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import gossipsub/[types, scoring, behavior]
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export types
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export scoring
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export behavior
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logScope:
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topics = "libp2p gossipsub"
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declareCounter(libp2p_gossipsub_failed_publish, "number of failed publish")
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declareCounter(libp2p_gossipsub_invalid_topic_subscription, "number of invalid topic subscriptions that happened")
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proc init*(_: type[GossipSubParams]): GossipSubParams =
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GossipSubParams(
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explicit: true,
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pruneBackoff: 1.minutes,
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floodPublish: true,
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gossipFactor: 0.25,
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d: GossipSubD,
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dLow: GossipSubDlo,
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dHigh: GossipSubDhi,
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dScore: GossipSubDlo,
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dOut: GossipSubDlo - 1, # DLow - 1
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dLazy: GossipSubD, # Like D
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heartbeatInterval: GossipSubHeartbeatInterval,
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historyLength: GossipSubHistoryLength,
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historyGossip: GossipSubHistoryGossip,
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fanoutTTL: GossipSubFanoutTTL,
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seenTTL: 2.minutes,
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gossipThreshold: -100,
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publishThreshold: -1000,
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graylistThreshold: -10000,
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opportunisticGraftThreshold: 0,
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decayInterval: 1.seconds,
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decayToZero: 0.01,
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retainScore: 2.minutes,
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appSpecificWeight: 0.0,
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ipColocationFactorWeight: 0.0,
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ipColocationFactorThreshold: 1.0,
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behaviourPenaltyWeight: -1.0,
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behaviourPenaltyDecay: 0.999,
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disconnectBadPeers: false
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)
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proc validateParameters*(parameters: GossipSubParams): Result[void, cstring] =
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if (parameters.dOut >= parameters.dLow) or
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(parameters.dOut > (parameters.d div 2)):
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err("gossipsub: dOut parameter error, Number of outbound connections to keep in the mesh. Must be less than D_lo and at most D/2")
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elif parameters.gossipThreshold >= 0:
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err("gossipsub: gossipThreshold parameter error, Must be < 0")
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elif parameters.publishThreshold >= parameters.gossipThreshold:
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err("gossipsub: publishThreshold parameter error, Must be < gossipThreshold")
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elif parameters.graylistThreshold >= parameters.publishThreshold:
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err("gossipsub: graylistThreshold parameter error, Must be < publishThreshold")
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elif parameters.acceptPXThreshold < 0:
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err("gossipsub: acceptPXThreshold parameter error, Must be >= 0")
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elif parameters.opportunisticGraftThreshold < 0:
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err("gossipsub: opportunisticGraftThreshold parameter error, Must be >= 0")
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elif parameters.decayToZero > 0.5 or parameters.decayToZero <= 0.0:
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err("gossipsub: decayToZero parameter error, Should be close to 0.0")
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elif parameters.appSpecificWeight < 0:
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err("gossipsub: appSpecificWeight parameter error, Must be positive")
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elif parameters.ipColocationFactorWeight > 0:
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err("gossipsub: ipColocationFactorWeight parameter error, Must be negative or 0")
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elif parameters.ipColocationFactorThreshold < 1.0:
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err("gossipsub: ipColocationFactorThreshold parameter error, Must be at least 1")
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elif parameters.behaviourPenaltyWeight >= 0:
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err("gossipsub: behaviourPenaltyWeight parameter error, Must be negative")
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elif parameters.behaviourPenaltyDecay < 0 or parameters.behaviourPenaltyDecay >= 1:
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err("gossipsub: behaviourPenaltyDecay parameter error, Must be between 0 and 1")
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else:
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ok()
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proc validateParameters*(parameters: TopicParams): Result[void, cstring] =
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if parameters.timeInMeshWeight <= 0.0 or parameters.timeInMeshWeight > 1.0:
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err("gossipsub: timeInMeshWeight parameter error, Must be a small positive value")
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elif parameters.timeInMeshCap <= 0.0:
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err("gossipsub: timeInMeshCap parameter error, Should be a positive value")
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elif parameters.firstMessageDeliveriesWeight <= 0.0:
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err("gossipsub: firstMessageDeliveriesWeight parameter error, Should be a positive value")
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elif parameters.meshMessageDeliveriesWeight >= 0.0:
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err("gossipsub: meshMessageDeliveriesWeight parameter error, Should be a negative value")
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elif parameters.meshMessageDeliveriesThreshold <= 0.0:
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err("gossipsub: meshMessageDeliveriesThreshold parameter error, Should be a positive value")
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elif parameters.meshMessageDeliveriesCap < parameters.meshMessageDeliveriesThreshold:
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err("gossipsub: meshMessageDeliveriesCap parameter error, Should be >= meshMessageDeliveriesThreshold")
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elif parameters.meshFailurePenaltyWeight >= 0.0:
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err("gossipsub: meshFailurePenaltyWeight parameter error, Should be a negative value")
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elif parameters.invalidMessageDeliveriesWeight >= 0.0:
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err("gossipsub: invalidMessageDeliveriesWeight parameter error, Should be a negative value")
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else:
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ok()
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method init*(g: GossipSub) =
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proc handler(conn: Connection, proto: string) {.async.} =
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## main protocol handler that gets triggered on every
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## connection for a protocol string
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## e.g. ``/floodsub/1.0.0``, etc...
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##
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try:
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await g.handleConn(conn, proto)
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except CancelledError:
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# This is top-level procedure which will work as separate task, so it
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# do not need to propogate CancelledError.
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trace "Unexpected cancellation in gossipsub handler", conn
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except CatchableError as exc:
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trace "GossipSub handler leaks an error", exc = exc.msg, conn
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g.handler = handler
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g.codecs &= GossipSubCodec
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g.codecs &= GossipSubCodec_10
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method onNewPeer(g: GossipSub, peer: PubSubPeer) =
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g.withPeerStats(peer.peerId) do (stats: var PeerStats):
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# Make sure stats and peer information match, even when reloading peer stats
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# from a previous connection
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peer.score = stats.score
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peer.appScore = stats.appScore
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peer.behaviourPenalty = stats.behaviourPenalty
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peer.iWantBudget = IWantPeerBudget
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peer.iHaveBudget = IHavePeerBudget
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method onPubSubPeerEvent*(p: GossipSub, peer: PubsubPeer, event: PubSubPeerEvent) {.gcsafe.} =
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case event.kind
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of PubSubPeerEventKind.Connected:
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discard
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of PubSubPeerEventKind.Disconnected:
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# If a send connection is lost, it's better to remove peer from the mesh -
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# if it gets reestablished, the peer will be readded to the mesh, and if it
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# doesn't, well.. then we hope the peer is going away!
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for topic, peers in p.mesh.mpairs():
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p.pruned(peer, topic)
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peers.excl(peer)
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for _, peers in p.fanout.mpairs():
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peers.excl(peer)
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procCall FloodSub(p).onPubSubPeerEvent(peer, event)
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method unsubscribePeer*(g: GossipSub, peer: PeerID) =
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## handle peer disconnects
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##
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trace "unsubscribing gossipsub peer", peer
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let pubSubPeer = g.peers.getOrDefault(peer)
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if pubSubPeer.isNil:
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trace "no peer to unsubscribe", peer
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return
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# remove from peer IPs collection too
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if pubSubPeer.address.isSome():
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g.peersInIP.withValue(pubSubPeer.address.get(), s):
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s[].excl(pubSubPeer.peerId)
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if s[].len == 0:
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g.peersInIP.del(pubSubPeer.address.get())
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for t in toSeq(g.gossipsub.keys):
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g.gossipsub.removePeer(t, pubSubPeer)
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# also try to remove from explicit table here
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g.explicit.removePeer(t, pubSubPeer)
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for t in toSeq(g.mesh.keys):
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trace "pruning unsubscribing peer", pubSubPeer, score = pubSubPeer.score
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g.pruned(pubSubPeer, t)
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g.mesh.removePeer(t, pubSubPeer)
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for t in toSeq(g.fanout.keys):
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g.fanout.removePeer(t, pubSubPeer)
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g.peerStats.withValue(peer, stats):
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for topic, info in stats[].topicInfos.mpairs:
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info.firstMessageDeliveries = 0
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procCall FloodSub(g).unsubscribePeer(peer)
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method subscribeTopic*(g: GossipSub,
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topic: string,
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subscribe: bool,
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peer: PubSubPeer) {.gcsafe.} =
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logScope:
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peer
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topic
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# this is a workaround for a race condition
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# that can happen if we disconnect the peer very early
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# in the future we might use this as a test case
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# and eventually remove this workaround
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if subscribe and peer.peerId notin g.peers:
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trace "ignoring unknown peer"
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return
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if subscribe and not(isNil(g.subscriptionValidator)) and not(g.subscriptionValidator(topic)):
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# this is a violation, so warn should be in order
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trace "ignoring invalid topic subscription", topic, peer
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libp2p_gossipsub_invalid_topic_subscription.inc()
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return
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if subscribe:
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trace "peer subscribed to topic"
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# subscribe remote peer to the topic
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discard g.gossipsub.addPeer(topic, peer)
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if peer.peerId in g.parameters.directPeers:
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discard g.explicit.addPeer(topic, peer)
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else:
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trace "peer unsubscribed from topic"
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# unsubscribe remote peer from the topic
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g.gossipsub.removePeer(topic, peer)
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g.mesh.removePeer(topic, peer)
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g.fanout.removePeer(topic, peer)
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if peer.peerId in g.parameters.directPeers:
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g.explicit.removePeer(topic, peer)
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trace "gossip peers", peers = g.gossipsub.peers(topic), topic
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proc handleControl(g: GossipSub, peer: PubSubPeer, rpcMsg: RPCMsg) =
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if rpcMsg.control.isSome:
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let control = rpcMsg.control.get()
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g.handlePrune(peer, control.prune)
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var respControl: ControlMessage
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respControl.iwant.add(g.handleIHave(peer, control.ihave))
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respControl.prune.add(g.handleGraft(peer, control.graft))
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let messages = g.handleIWant(peer, control.iwant)
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if
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respControl.graft.len > 0 or
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respControl.prune.len > 0 or
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respControl.iwant.len > 0 or
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messages.len > 0:
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# iwant and prunes from here, also messages
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for smsg in messages:
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for topic in smsg.topicIDs:
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if g.knownTopics.contains(topic):
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libp2p_pubsub_broadcast_messages.inc(labelValues = [topic])
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else:
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libp2p_pubsub_broadcast_messages.inc(labelValues = ["generic"])
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libp2p_pubsub_broadcast_iwant.inc(respControl.iwant.len.int64)
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for prune in respControl.prune:
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if g.knownTopics.contains(prune.topicID):
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libp2p_pubsub_broadcast_prune.inc(labelValues = [prune.topicID])
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else:
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libp2p_pubsub_broadcast_prune.inc(labelValues = ["generic"])
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trace "sending control message", msg = shortLog(respControl), peer
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g.send(
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peer,
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RPCMsg(control: some(respControl), messages: messages))
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method rpcHandler*(g: GossipSub,
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peer: PubSubPeer,
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rpcMsg: RPCMsg) {.async.} =
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# base will check the amount of subscriptions and process subscriptions
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# also will update some metrics
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await procCall PubSub(g).rpcHandler(peer, rpcMsg)
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# the above call applied limtis to subs number
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# in gossipsub we want to apply scoring as well
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if rpcMsg.subscriptions.len > g.topicsHigh:
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debug "received an rpc message with an oversized amount of subscriptions", peer,
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size = rpcMsg.subscriptions.len,
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limit = g.topicsHigh
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peer.behaviourPenalty += 0.1
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for msg in rpcMsg.messages: # for every message
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let msgId = g.msgIdProvider(msg)
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# avoid the remote peer from controlling the seen table hashing
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# by adding random bytes to the ID we ensure we randomize the IDs
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# we do only for seen as this is the great filter from the external world
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if g.addSeen(msgId):
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trace "Dropping already-seen message", msgId = shortLog(msgId), peer
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# make sure to update score tho before continuing
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# TODO: take into account meshMessageDeliveriesWindow
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# score only if messages are not too old.
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g.rewardDelivered(peer, msg.topicIDs, false)
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# onto the next message
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continue
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# avoid processing messages we are not interested in
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if msg.topicIDs.allIt(it notin g.topics):
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debug "Dropping message of topic without subscription", msgId = shortLog(msgId), peer
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continue
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if (msg.signature.len > 0 or g.verifySignature) and not msg.verify():
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# always validate if signature is present or required
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debug "Dropping message due to failed signature verification",
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msgId = shortLog(msgId), peer
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g.punishInvalidMessage(peer, msg.topicIDs)
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continue
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if msg.seqno.len > 0 and msg.seqno.len != 8:
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# if we have seqno should be 8 bytes long
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debug "Dropping message due to invalid seqno length",
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msgId = shortLog(msgId), peer
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g.punishInvalidMessage(peer, msg.topicIDs)
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continue
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# g.anonymize needs no evaluation when receiving messages
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# as we have a "lax" policy and allow signed messages
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let validation = await g.validate(msg)
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case validation
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of ValidationResult.Reject:
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debug "Dropping message after validation, reason: reject",
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msgId = shortLog(msgId), peer
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g.punishInvalidMessage(peer, msg.topicIDs)
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continue
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of ValidationResult.Ignore:
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debug "Dropping message after validation, reason: ignore",
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msgId = shortLog(msgId), peer
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continue
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of ValidationResult.Accept:
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discard
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# store in cache only after validation
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g.mcache.put(msgId, msg)
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g.rewardDelivered(peer, msg.topicIDs, true)
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var toSendPeers = initHashSet[PubSubPeer]()
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for t in msg.topicIDs: # for every topic in the message
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if t notin g.topics:
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continue
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g.floodsub.withValue(t, peers): toSendPeers.incl(peers[])
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g.mesh.withValue(t, peers): toSendPeers.incl(peers[])
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await handleData(g, t, msg.data)
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# In theory, if topics are the same in all messages, we could batch - we'd
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# also have to be careful to only include validated messages
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g.broadcast(toSendPeers, RPCMsg(messages: @[msg]))
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trace "forwared message to peers", peers = toSendPeers.len, msgId, peer
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for topic in msg.topicIDs:
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if g.knownTopics.contains(topic):
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libp2p_pubsub_messages_rebroadcasted.inc(toSendPeers.len.int64, labelValues = [topic])
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else:
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libp2p_pubsub_messages_rebroadcasted.inc(toSendPeers.len.int64, labelValues = ["generic"])
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g.handleControl(peer, rpcMsg)
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method subscribe*(g: GossipSub,
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topic: string,
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handler: TopicHandler) =
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procCall PubSub(g).subscribe(topic, handler)
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# if we have a fanout on this topic break it
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if topic in g.fanout:
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g.fanout.del(topic)
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# rebalance but don't update metrics here, we do that only in the heartbeat
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g.rebalanceMesh(topic, metrics = nil)
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proc unsubscribe*(g: GossipSub, topic: string) =
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var
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msg = RPCMsg.withSubs(@[topic], subscribe = false)
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gpeers = g.gossipsub.getOrDefault(topic)
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if topic in g.mesh:
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let mpeers = g.mesh.getOrDefault(topic)
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# remove mesh peers from gpeers, we send 2 different messages
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gpeers = gpeers - mpeers
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# send to peers NOT in mesh first
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g.broadcast(gpeers, msg)
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for peer in mpeers:
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trace "pruning unsubscribeAll call peer", peer, score = peer.score
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g.pruned(peer, topic)
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g.mesh.del(topic)
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msg.control =
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some(ControlMessage(prune:
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@[ControlPrune(topicID: topic,
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peers: g.peerExchangeList(topic),
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backoff: g.parameters.pruneBackoff.seconds.uint64)]))
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# send to peers IN mesh now
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g.broadcast(mpeers, msg)
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else:
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g.broadcast(gpeers, msg)
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g.topicParams.del(topic)
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method unsubscribeAll*(g: GossipSub, topic: string) =
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g.unsubscribe(topic)
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# finally let's remove from g.topics, do that by calling PubSub
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procCall PubSub(g).unsubscribeAll(topic)
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method unsubscribe*(g: GossipSub,
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topics: seq[TopicPair]) =
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procCall PubSub(g).unsubscribe(topics)
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for (topic, handler) in topics:
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# delete from mesh only if no handlers are left
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# (handlers are removed in pubsub unsubscribe above)
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if topic notin g.topics:
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g.unsubscribe(topic)
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method publish*(g: GossipSub,
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topic: string,
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data: seq[byte]): Future[int] {.async.} =
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# base returns always 0
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discard await procCall PubSub(g).publish(topic, data)
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logScope:
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topic
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trace "Publishing message on topic", data = data.shortLog
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if topic.len <= 0: # data could be 0/empty
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debug "Empty topic, skipping publish"
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return 0
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var peers: HashSet[PubSubPeer]
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if g.parameters.floodPublish:
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# With flood publishing enabled, the mesh is used when propagating messages from other peers,
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# but a peer's own messages will always be published to all known peers in the topic.
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for peer in g.gossipsub.getOrDefault(topic):
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if peer.score >= g.parameters.publishThreshold:
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trace "publish: including flood/high score peer", peer
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peers.incl(peer)
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# add always direct peers
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peers.incl(g.explicit.getOrDefault(topic))
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if topic in g.topics: # if we're subscribed use the mesh
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peers.incl(g.mesh.getOrDefault(topic))
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else: # not subscribed, send to fanout peers
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# try optimistically
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peers.incl(g.fanout.getOrDefault(topic))
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if peers.len == 0:
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# ok we had nothing.. let's try replenish inline
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g.replenishFanout(topic)
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peers.incl(g.fanout.getOrDefault(topic))
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# even if we couldn't publish,
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# we still attempted to publish
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# on the topic, so it makes sense
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# to update the last topic publish
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# time
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g.lastFanoutPubSub[topic] = Moment.fromNow(g.parameters.fanoutTTL)
|
|
|
|
if peers.len == 0:
|
|
let topicPeers = g.gossipsub.getOrDefault(topic).toSeq()
|
|
notice "No peers for topic, skipping publish", peersOnTopic = topicPeers.len,
|
|
connectedPeers = topicPeers.filterIt(it.connected).len,
|
|
topic
|
|
# skipping topic as our metrics finds that heavy
|
|
libp2p_gossipsub_failed_publish.inc()
|
|
return 0
|
|
|
|
inc g.msgSeqno
|
|
let
|
|
msg =
|
|
if g.anonymize:
|
|
Message.init(none(PeerInfo), data, topic, none(uint64), false)
|
|
else:
|
|
Message.init(some(g.peerInfo), data, topic, some(g.msgSeqno), g.sign)
|
|
msgId = g.msgIdProvider(msg)
|
|
|
|
logScope: msgId = shortLog(msgId)
|
|
|
|
trace "Created new message", msg = shortLog(msg), peers = peers.len
|
|
|
|
if g.addSeen(msgId):
|
|
# custom msgid providers might cause this
|
|
trace "Dropping already-seen message"
|
|
return 0
|
|
|
|
g.mcache.put(msgId, msg)
|
|
|
|
g.broadcast(peers, RPCMsg(messages: @[msg]))
|
|
|
|
if g.knownTopics.contains(topic):
|
|
libp2p_pubsub_messages_published.inc(peers.len.int64, labelValues = [topic])
|
|
else:
|
|
libp2p_pubsub_messages_published.inc(peers.len.int64, labelValues = ["generic"])
|
|
|
|
trace "Published message to peers", peers=peers.len
|
|
|
|
return peers.len
|
|
|
|
proc maintainDirectPeers(g: GossipSub) {.async.} =
|
|
while g.heartbeatRunning:
|
|
for id, addrs in g.parameters.directPeers:
|
|
let peer = g.peers.getOrDefault(id)
|
|
if isNil(peer):
|
|
trace "Attempting to dial a direct peer", peer = id
|
|
try:
|
|
# dial, internally connection will be stored
|
|
let _ = await g.switch.dial(id, addrs, g.codecs)
|
|
# populate the peer after it's connected
|
|
discard g.getOrCreatePeer(id, g.codecs)
|
|
except CancelledError:
|
|
trace "Direct peer dial canceled"
|
|
raise
|
|
except CatchableError as exc:
|
|
debug "Direct peer error dialing", msg = exc.msg
|
|
|
|
await sleepAsync(1.minutes)
|
|
|
|
method start*(g: GossipSub) {.async.} =
|
|
trace "gossipsub start"
|
|
|
|
if not g.heartbeatFut.isNil:
|
|
warn "Starting gossipsub twice"
|
|
return
|
|
|
|
g.heartbeatRunning = true
|
|
g.heartbeatFut = g.heartbeat()
|
|
g.directPeersLoop = g.maintainDirectPeers()
|
|
|
|
method stop*(g: GossipSub) {.async.} =
|
|
trace "gossipsub stop"
|
|
if g.heartbeatFut.isNil:
|
|
warn "Stopping gossipsub without starting it"
|
|
return
|
|
|
|
# stop heartbeat interval
|
|
g.heartbeatRunning = false
|
|
g.directPeersLoop.cancel()
|
|
if not g.heartbeatFut.finished:
|
|
trace "awaiting last heartbeat"
|
|
await g.heartbeatFut
|
|
trace "heartbeat stopped"
|
|
g.heartbeatFut = nil
|
|
|
|
method initPubSub*(g: GossipSub) =
|
|
procCall FloodSub(g).initPubSub()
|
|
|
|
if not g.parameters.explicit:
|
|
g.parameters = GossipSubParams.init()
|
|
|
|
g.parameters.validateParameters().tryGet()
|
|
|
|
randomize()
|
|
|
|
# init the floodsub stuff here, we customize timedcache in gossip!
|
|
g.seen = TimedCache[MessageID].init(g.parameters.seenTTL)
|
|
|
|
# init gossip stuff
|
|
g.mcache = MCache.init(g.parameters.historyGossip, g.parameters.historyLength)
|