mirror of https://github.com/waku-org/nwaku.git
266 lines
8.5 KiB
Nim
266 lines
8.5 KiB
Nim
## Waku Relay module. Thin layer on top of GossipSub.
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##
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## See https://github.com/vacp2p/specs/blob/master/specs/waku/v2/waku-relay.md
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## for spec.
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when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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import
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stew/results,
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sequtils,
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chronos,
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chronicles,
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metrics,
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libp2p/multihash,
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libp2p/protocols/pubsub/pubsub,
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libp2p/protocols/pubsub/gossipsub,
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libp2p/protocols/pubsub/rpc/messages,
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libp2p/stream/connection,
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libp2p/switch
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import
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../waku_core,
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./message_id
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logScope:
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topics = "waku relay"
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const
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WakuRelayCodec* = "/vac/waku/relay/2.0.0"
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# see: https://github.com/libp2p/specs/blob/master/pubsub/gossipsub/gossipsub-v1.1.md#overview-of-new-parameters
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const TopicParameters = TopicParams(
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topicWeight: 1,
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# p1: favours peers already in the mesh
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timeInMeshWeight: 0.01,
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timeInMeshQuantum: 1.seconds,
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timeInMeshCap: 10.0,
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# p2: rewards fast peers
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firstMessageDeliveriesWeight: 1.0,
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firstMessageDeliveriesDecay: 0.5,
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firstMessageDeliveriesCap: 10.0,
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# p3: penalizes lazy peers. safe low value
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meshMessageDeliveriesWeight: 0.0,
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meshMessageDeliveriesDecay: 0.0,
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meshMessageDeliveriesCap: 0,
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meshMessageDeliveriesThreshold: 0,
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meshMessageDeliveriesWindow: 0.milliseconds,
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meshMessageDeliveriesActivation: 0.seconds,
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# p3b: tracks history of prunes
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meshFailurePenaltyWeight: 0.0,
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meshFailurePenaltyDecay: 0.0,
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# p4: penalizes invalid messages. highly penalize
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# peers sending wrong messages
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invalidMessageDeliveriesWeight: -100.0,
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invalidMessageDeliveriesDecay: 0.5
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)
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# see: https://rfc.vac.dev/spec/29/#gossipsub-v10-parameters
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const GossipsubParameters = GossipSubParams(
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explicit: true,
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pruneBackoff: chronos.minutes(1),
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unsubscribeBackoff: chronos.seconds(5),
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floodPublish: true,
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gossipFactor: 0.25,
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d: 6,
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dLow: 4,
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dHigh: 8,
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dScore: 6,
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dOut: 3,
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dLazy: 6,
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heartbeatInterval: chronos.seconds(1),
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historyLength: 6,
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historyGossip: 3,
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fanoutTTL: chronos.minutes(1),
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seenTTL: chronos.minutes(2),
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# no gossip is sent to peers below this score
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gossipThreshold: -100,
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# no self-published msgs are sent to peers below this score
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publishThreshold: -1000,
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# used to trigger disconnections + ignore peer if below this score
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graylistThreshold: -10000,
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# grafts better peers if the mesh median score drops below this. unset.
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opportunisticGraftThreshold: 0,
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# how often peer scoring is updated
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decayInterval: chronos.seconds(12),
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# below this we consider the parameter to be zero
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decayToZero: 0.01,
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# remember peer score during x after it disconnects
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retainScore: chronos.minutes(10),
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# p5: application specific, unset
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appSpecificWeight: 0.0,
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# p6: penalizes peers sharing more than threshold ips
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ipColocationFactorWeight: -50.0,
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ipColocationFactorThreshold: 5.0,
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# p7: penalizes bad behaviour (weight and decay)
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behaviourPenaltyWeight: -10.0,
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behaviourPenaltyDecay: 0.986,
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# triggers disconnections of bad peers aka score <graylistThreshold
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disconnectBadPeers: true
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)
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type
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WakuRelayResult*[T] = Result[T, string]
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WakuRelayHandler* = proc(pubsubTopic: PubsubTopic, message: WakuMessage): Future[void] {.gcsafe, raises: [Defect].}
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WakuValidatorHandler* = proc(pubsubTopic: PubsubTopic, message: WakuMessage): Future[ValidationResult] {.gcsafe, raises: [Defect].}
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WakuRelay* = ref object of GossipSub
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# a map of PubsubTopic's => seq[WakuValidatorHandler] that are
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# called in order every time a message is received on a given pubsub topic
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wakuValidators: Table[PubsubTopic, seq[WakuValidatorHandler]]
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# a map that stores whether the ordered validator has been inserted
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# for a given PubsubTopic
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validatorInserted: Table[PubsubTopic, bool]
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proc initProtocolHandler(w: WakuRelay) =
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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. ``/wakusub/0.0.1``, etc...
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debug "Incoming WakuRelay connection", connection=conn, protocol=proto
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try:
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await w.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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error "Unexpected cancellation in relay handler", conn=conn, error=getCurrentExceptionMsg()
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except CatchableError:
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error "WakuRelay handler leaks an error", conn=conn, error=getCurrentExceptionMsg()
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# XXX: Handler hijack GossipSub here?
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w.handler = handler
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w.codec = WakuRelayCodec
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proc new*(T: type WakuRelay, switch: Switch): WakuRelayResult[T] =
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var w: WakuRelay
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try:
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w = WakuRelay.init(
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switch = switch,
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anonymize = true,
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verifySignature = false,
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sign = false,
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triggerSelf = true,
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msgIdProvider = defaultMessageIdProvider,
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maxMessageSize = MaxWakuMessageSize,
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parameters = GossipsubParameters
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)
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procCall GossipSub(w).initPubSub()
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w.initProtocolHandler()
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except InitializationError:
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return err("initialization error: " & getCurrentExceptionMsg())
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return ok(w)
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proc addValidator*(w: WakuRelay,
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topic: varargs[string],
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handler: WakuValidatorHandler) {.gcsafe.} =
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for t in topic:
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w.wakuValidators.mgetOrPut(t, @[]).add(handler)
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method start*(w: WakuRelay) {.async.} =
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debug "start"
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await procCall GossipSub(w).start()
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method stop*(w: WakuRelay) {.async.} =
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debug "stop"
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await procCall GossipSub(w).stop()
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proc isSubscribed*(w: WakuRelay, topic: PubsubTopic): bool =
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GossipSub(w).topics.hasKey(topic)
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proc subscribedTopics*(w: WakuRelay): seq[PubsubTopic] =
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return toSeq(GossipSub(w).topics.keys())
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proc generateOrderedValidator*(w: WakuRelay): auto {.gcsafe.} =
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# rejects messages that are not WakuMessage
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let wrappedValidator = proc(pubsubTopic: string,
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message: messages.Message): Future[ValidationResult] {.async.} =
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# can be optimized by checking if the message is a WakuMessage without allocating memory
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# see nim-libp2p protobuf library
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let msgRes = WakuMessage.decode(message.data)
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if msgRes.isErr():
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return ValidationResult.Reject
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let msg = msgRes.get()
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# now sequentially validate the message
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if w.wakuValidators.hasKey(pubsubTopic):
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for validator in w.wakuValidators[pubsubTopic]:
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let validatorRes = await validator(pubsubTopic, msg)
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if validatorRes != ValidationResult.Accept:
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return validatorRes
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return ValidationResult.Accept
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return wrappedValidator
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proc subscribe*(w: WakuRelay, pubsubTopic: PubsubTopic, handler: WakuRelayHandler): TopicHandler =
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debug "subscribe", pubsubTopic=pubsubTopic
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# we need to wrap the handler since gossipsub doesnt understand WakuMessage
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let wrappedHandler =
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proc(pubsubTopic: string, data: seq[byte]): Future[void] {.gcsafe, raises: [].} =
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let decMsg = WakuMessage.decode(data)
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if decMsg.isErr():
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# fine if triggerSelf enabled, since validators are bypassed
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error "failed to decode WakuMessage, validator passed a wrong message", error = decMsg.error
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let fut = newFuture[void]()
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fut.complete()
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return fut
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else:
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return handler(pubsubTopic, decMsg.get())
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# add the ordered validator to the topic
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if not w.validatorInserted.hasKey(pubSubTopic):
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procCall GossipSub(w).addValidator(pubSubTopic, w.generateOrderedValidator())
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w.validatorInserted[pubSubTopic] = true
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# set this topic parameters for scoring
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w.topicParams[pubsubTopic] = TopicParameters
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# subscribe to the topic with our wrapped handler
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procCall GossipSub(w).subscribe(pubsubTopic, wrappedHandler)
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return wrappedHandler
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proc unsubscribeAll*(w: WakuRelay, pubsubTopic: PubsubTopic) =
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## Unsubscribe all handlers on this pubsub topic
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debug "unsubscribe all", pubsubTopic=pubsubTopic
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procCall GossipSub(w).unsubscribeAll(pubsubTopic)
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w.validatorInserted.del(pubsubTopic)
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proc unsubscribe*(w: WakuRelay, pubsubTopic: PubsubTopic, handler: TopicHandler) =
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## Unsubscribe this handler on this pubsub topic
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debug "unsubscribe", pubsubTopic=pubsubTopic
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procCall GossipSub(w).unsubscribe(pubsubTopic, handler)
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proc publish*(w: WakuRelay, pubsubTopic: PubsubTopic, message: WakuMessage): Future[int] {.async.} =
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trace "publish", pubsubTopic=pubsubTopic
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let data = message.encode().buffer
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return await procCall GossipSub(w).publish(pubsubTopic, data)
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