# beacon_chain # Copyright (c) 2018-2020 Status Research & Development GmbH # Licensed and distributed under either of # * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT). # * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0). # at your option. This file may not be copied, modified, or distributed except according to those terms. import sequtils, strutils, os, tables, options import confutils, chronicles, chronos import libp2p/[switch, standard_setup, multiaddress, multicodec, peerinfo] import libp2p/crypto/crypto as lcrypto import libp2p/crypto/secp as lsecp import libp2p/protocols/pubsub/[pubsub, gossipsub] import eth/p2p/discoveryv5/enr as enr import eth/p2p/discoveryv5/[protocol, discovery_db, node] import eth/keys as ethkeys, eth/trie/db import stew/[results, objects] import stew/byteutils as bu import stew/shims/net import nimcrypto/[hash, keccak] import secp256k1 as s import stint import snappy import spec/[crypto, datatypes, network, digest], ssz/ssz_serialization const InspectorName* = "Beacon-Chain Network Inspector" InspectorMajor*: int = 0 InspectorMinor*: int = 0 InspectorPatch*: int = 3 InspectorVersion* = $InspectorMajor & "." & $InspectorMinor & "." & $InspectorPatch InspectorIdent* = "Inspector/$1 ($2/$3)" % [InspectorVersion, hostCPU, hostOS] InspectorCopyright* = "Copyright(C) 2020" & " Status Research & Development GmbH" InspectorHeader* = InspectorName & ", Version " & InspectorVersion & " [" & hostOS & ": " & hostCPU & "]\r\n" & InspectorCopyright & "\r\n" DISCV5BN* = mapAnd(UDP, mapEq("p2p")) ETH2BN* = mapAnd(TCP, mapEq("p2p")) type DiscoveryProtocol* = protocol.Protocol ENRFieldPair* = object eth2: seq[byte] attnets: seq[byte] ENRForkID* = object fork_digest*: ForkDigest next_fork_version*: Version next_fork_epoch*: Epoch TopicFilter* {.pure.} = enum Blocks, Attestations, Exits, ProposerSlashing, AttesterSlashings BootstrapKind* {.pure.} = enum Enr, MultiAddr StartUpCommand* {.pure.} = enum noCommand BootstrapAddress* = object case kind*: BootstrapKind of BootstrapKind.Enr: addressRec: enr.Record of BootstrapKind.MultiAddr: addressMa: MultiAddress InspectorConf* = object logLevel* {. defaultValue: LogLevel.TRACE desc: "Sets the inspector's verbosity log level" abbr: "v" name: "verbosity" }: LogLevel fullPeerId* {. defaultValue: false desc: "Sets the inspector full PeerID output" abbr: "p" name: "fullpeerid" }: bool floodSub* {. defaultValue: true desc: "Sets inspector engine to FloodSub" abbr: "f" name: "floodsub" }: bool gossipSub* {. defaultValue: false desc: "Sets inspector engine to GossipSub" abbr: "g" name: "gossipsub" }: bool forkDigest* {. defaultValue: "", desc: "Sets the fork-digest value used to construct all topic names" name: "forkdigest"}: string signFlag* {. defaultValue: false desc: "Sets the inspector's to send/verify signatures in pubsub messages" abbr: "s" name: "sign" }: bool topics* {. desc: "Sets monitored topics, where `*` - all, " & "[a]ttestations, [b]locks, [e]xits, " & "[ps]roposer slashings, [as]ttester slashings" abbr: "t" name: "topics" }: seq[string] customTopics* {. desc: "Sets custom monitored topics" abbr: "c" name: "custom" }: seq[string] bootstrapFile* {. defaultValue: "" desc: "Specifies file which holds bootstrap nodes multiaddresses " & "delimeted by CRLF" abbr: "l" name: "bootfile" }: string bootstrapNodes* {. desc: "Specifies one or more bootstrap nodes" & " to use when connecting to the network" abbr: "b" name: "bootnodes" }: seq[string] decode* {. desc: "Try to decode message using SSZ" abbr: "d" defaultValue: false }: bool discoveryPort* {. desc: "DiscoveryV5 UDP port number" defaultValue: 9000 }: int ethPort* {. desc: "Ethereum2 TCP port number", defaultValue: 9000 }: int bindAddress* {. desc: "Bind Discovery to MultiAddress", defaultValue: "/ip4/0.0.0.0".}: string maxPeers* {. desc: "Maximum number of peers", defaultValue: 100.}: int noDiscovery* {. desc: "Disable discovery", defaultValue: false.}: bool StrRes[T] = Result[T, string] func `==`*(a, b: ENRFieldPair): bool {.inline.} = result = (a.eth2 == b.eth2) func hasTCP(a: PeerInfo): bool = for ma in a.addrs: if TCP.match(ma): return true func toNodeId(a: PeerID): Option[NodeId] = var buffer: array[64, byte] if a.hasPublicKey(): var pubkey: lcrypto.PublicKey if extractPublicKey(a, pubkey): if pubkey.scheme == PKScheme.Secp256k1: let tmp = s.SkPublicKey(pubkey.skkey).toRaw() copyMem(addr buffer[0], unsafeAddr tmp[1], 64) result = some(readUintBE[256](keccak256.digest(buffer).data)) chronicles.formatIt PeerInfo: it.shortLog chronicles.formatIt seq[PeerInfo]: var res = newSeq[string]() for item in it.items(): res.add($item.shortLog()) "[" & res.join(", ") & "]" func getTopics(forkDigest: ForkDigest, filter: TopicFilter): seq[string] {.inline.} = case filter of TopicFilter.Blocks: let topic = getBeaconBlocksTopic(forkDigest) @[topic & "_snappy"] of TopicFilter.Exits: let topic = getVoluntaryExitsTopic(forkDigest) @[topic & "_snappy"] of TopicFilter.ProposerSlashing: let topic = getProposerSlashingsTopic(forkDigest) @[topic & "_snappy"] of TopicFilter.AttesterSlashings: let topic = getAttesterSlashingsTopic(forkDigest) @[topic & "_snappy"] of TopicFilter.Attestations: mapIt( 0'u64 ..< ATTESTATION_SUBNET_COUNT.uint64, getAttestationTopic(forkDigest, it) & "_snappy") proc loadBootFile(name: string): seq[string] = try: result = readFile(name).splitLines() except: discard func unpackYmlLine(line: string): string = result = line let stripped = line.strip() var parts = stripped.split({'"'}) if len(parts) == 3: if parts[0].startsWith("-") and len(parts[2]) == 0: result = parts[1] proc getBootstrapAddress(bootnode: string): Option[BootstrapAddress] = var rec: enr.Record try: var stripped = bootnode.strip() if stripped.startsWith("-"): stripped = unpackYmlLine(stripped) if len(stripped) > 0: if stripped.startsWith("enr:"): if fromURI(rec, EnrUri(stripped)): let res = BootstrapAddress(kind: BootstrapKind.Enr, addressRec: rec) return some(res) else: warn "Incorrect or empty ENR bootstrap address", address = stripped else: let maRes = MultiAddress.init(stripped) let ma = if maRes.isOk: maRes.get else: return if ETH2BN.match(ma) or DISCV5BN.match(ma): let res = BootstrapAddress(kind: BootstrapKind.MultiAddr, addressMa: ma) return some(res) else: warn "Incorrect MultiAddress bootstrap address", address = stripped except CatchableError as exc: warn "Incorrect bootstrap address", address = bootnode, errMsg = exc.msg func tryGetForkDigest(bootnode: enr.Record): Option[ForkDigest] = var forkId: ENRForkID var sszForkData = bootnode.tryGet("eth2", seq[byte]) if sszForkData.isSome(): try: forkId = SSZ.decode(sszForkData.get(), ENRForkID) result = some(forkId.fork_digest) except CatchableError: discard func tryGetFieldPairs(bootnode: enr.Record): Option[ENRFieldPair] = var sszEth2 = bootnode.tryGet("eth2", seq[byte]) var sszAttnets = bootnode.tryGet("attnets", seq[byte]) if sszEth2.isSome() and sszAttnets.isSome(): result = some(ENRFieldPair(eth2: sszEth2.get(), attnets: sszAttnets.get())) func tryGetForkDigest(hexdigest: string): Option[ForkDigest] = var res: ForkDigest if len(hexdigest) > 0: try: hexToByteArray(hexdigest, array[4 ,byte](res)) result = some(res) except CatchableError: discard func tryGetMultiAddress(address: string): Option[MultiAddress] = let maRes = MultiAddress.init(address) let ma = if maRes.isOk: maRes.get else: return if IP4.match(ma) or IP6.match(ma): result = some(ma) proc loadBootstrapNodes(conf: InspectorConf): seq[BootstrapAddress] = result = newSeq[BootstrapAddress]() if len(conf.bootstrapFile) > 0: info "Loading bootstrap nodes from file", filename = conf.bootstrapFile var nodes = loadBootFile(conf.bootstrapFile) for nodeString in nodes: let res = getBootstrapAddress(nodeString) if res.isSome(): result.add(res.get()) for nodeString in conf.bootstrapNodes: let res = getBootstrapAddress(nodeString) if res.isSome(): result.add(res.get()) proc init*(p: typedesc[PeerInfo], maddr: MultiAddress): StrRes[PeerInfo] {.inline.} = ## Initialize PeerInfo using address which includes PeerID. if IPFS.match(maddr): let peerid = ? protoAddress(? maddr[2]) result = ok(PeerInfo.init( ? (PeerID.init(peerid).mapErr(proc (v: cstring): string = $v)), [(? maddr[0]) & (? maddr[1])])) proc init*(p: typedesc[PeerInfo], enraddr: enr.Record): StrRes[PeerInfo] = var trec: enr.TypedRecord try: let trecOpt = enraddr.toTypedRecord() if trecOpt.isOk(): trec = trecOpt.get() if trec.secp256k1.isSome(): let skpubkey = ethkeys.PublicKey.fromRaw(trec.secp256k1.get()) if skpubkey.isOk(): let peerid = PeerID.init( PublicKey(scheme: Secp256k1, skkey: lsecp.SkPublicKey(skpubkey.get()))) var mas = newSeq[MultiAddress]() if trec.ip.isSome() and trec.tcp.isSome(): let ma = (? MultiAddress.init(multiCodec("ip4"), trec.ip.get())) & (? MultiAddress.init(multiCodec("tcp"), trec.tcp.get())) mas.add(ma) if trec.ip6.isSome() and trec.tcp6.isSome(): let ma = (? MultiAddress.init(multiCodec("ip6"), trec.ip6.get())) & (? MultiAddress.init(multiCodec("tcp"), trec.tcp6.get())) mas.add(ma) if trec.ip.isSome() and trec.udp.isSome(): let ma = (? MultiAddress.init(multiCodec("ip4"), trec.ip.get())) & (? MultiAddress.init(multiCodec("udp"), trec.udp.get())) mas.add(ma) if trec.ip6.isSome() and trec.udp6.isSome(): let ma = (? MultiAddress.init(multiCodec("ip6"), trec.ip6.get())) & (? MultiAddress.init(multiCodec("udp"), trec.udp6.get())) mas.add(ma) result = ok PeerInfo.init(peerid.tryGet(), mas) except CatchableError as exc: warn "Error", errMsg = exc.msg, record = enraddr.toUri() proc connectToNetwork(switch: Switch, nodes: seq[PeerInfo], timeout: Duration): Future[seq[PeerInfo]] {.async.} = var pending = newSeq[Future[void]]() var res = newSeq[PeerInfo]() var timed, succeed, failed: int for pinfo in nodes: pending.add(switch.connect(pinfo.peerId, pinfo.addrs)) debug "Connecting to peers", count = $len(pending), peers = nodes if len(pending) > 0: var timer = sleepAsync(timeout) discard await one(timer, allFutures(pending)) for i in 0 ..< len(pending): let fut = pending[i] if fut.finished(): if fut.failed(): inc(failed) warn "Unable to connect to node", address = nodes[i], errMsg = fut.readError().msg else: inc(succeed) info "Connected to node", address = nodes[i] res.add(nodes[i]) else: inc(timed) fut.cancel() warn "Connection to node timed out", address = nodes[i] debug "Connection statistics", succeed = succeed, failed = failed, timeout = timed, count = $len(pending) result = res proc connectLoop*(switch: Switch, peerQueue: AsyncQueue[PeerInfo], peerTable: TableRef[PeerID, PeerInfo], timeout: Duration): Future[void] {.async.} = var addresses = newSeq[PeerInfo]() trace "Starting connection loop", queue_size = len(peerQueue), table_size = len(peerTable), timeout = timeout while true: if len(addresses) > 0: addresses.setLen(0) let ma = await peerQueue.popFirst() addresses.add(ma) while not(peerQueue.empty()): addresses.add(peerQueue.popFirstNoWait()) trace "Got new peers", count = len(addresses) var infos = await switch.connectToNetwork(addresses, timeout) for item in infos: peerTable[item.peerId] = item func toIpAddress*(ma: MultiAddress): Option[ValidIpAddress] = if IP4.match(ma): let addressRes = ma.protoAddress() let address = if addressRes.isOk: addressRes.get else: return result = some(ipv4 toArray(4, address)) elif IP6.match(ma): let addressRes = ma.protoAddress() let address = if addressRes.isOk: addressRes.get else: return result = some(ipv6 toArray(16, address)) proc bootstrapDiscovery(conf: InspectorConf, host: MultiAddress, privkey: lcrypto.PrivateKey, bootnodes: seq[enr.Record], enrFields: Option[ENRFieldPair]): DiscoveryProtocol = var pk = ethkeys.PrivateKey(privkey.skkey) var db = DiscoveryDB.init(newMemoryDB()) let udpPort = Port(conf.discoveryPort) let tcpPort = Port(conf.ethPort) let host = host.toIpAddress() if enrFields.isSome(): let fields = enrFields.get() let pairs = {"eth2": fields.eth2, "attnets": fields.attnets} result = newProtocol(pk, db, host, tcpPort, udpPort, pairs, bootnodes) else: result = newProtocol(pk, db, host, tcpPort, udpPort, [], bootnodes) result.open() result.start() proc logEnrAddress(address: string) = var rec: enr.Record trec: enr.TypedRecord eth2fork_digest, eth2next_fork_version, eth2next_fork_epoch: string attnets: string if fromURI(rec, EnrUri(address)): var eth2Data = rec.tryGet("eth2", seq[byte]) var attnData = rec.tryGet("attnets", seq[byte]) var optrec = rec.toTypedRecord() if optrec.isOk(): trec = optrec.get() if eth2Data.isSome(): try: var forkid = SSZ.decode(eth2Data.get(), ENRForkID) eth2fork_digest = $forkid.fork_digest eth2next_fork_version = $forkid.next_fork_version eth2next_fork_epoch = strutils.toHex(cast[uint64](forkid.next_fork_epoch)) except CatchableError: eth2fork_digest = "Error" eth2next_fork_version = "Error" eth2next_fork_epoch = "Error" else: eth2fork_digest = "None" eth2next_fork_version = "None" eth2next_fork_epoch = "None" if attnData.isSome(): var attn = SSZ.decode(attnData.get(), List[byte, 9999999]) # TODO: what's the limit on that list? attnets = bu.toHex(attn.asSeq) else: attnets = "None" info "ENR bootstrap address fileds", enr_uri = address, enr_id = trec.id, secp256k1 = if trec.secp256k1.isSome(): bu.toHex(trec.secp256k1.get()) else: "None", ip4 = if trec.ip.isSome(): $MultiAddress.init(multiCodec("ip4"), trec.ip.get()) else: "None", ip6 = if trec.ip6.isSome(): $MultiAddress.init(multiCodec("ip6"), trec.ip6.get()) else: "None", tcp = if trec.tcp.isSome(): $trec.tcp.get() else: "None", udp = if trec.udp.isSome(): $trec.udp.get() else: "None", tcp6 = if trec.tcp6.isSome(): $trec.tcp6.get() else: "None", udp6 = if trec.udp6.isSome(): $trec.udp6.get() else: "None", eth2_fork_digest = eth2fork_digest, eth2_next_fork_version = eth2next_fork_version, eth2_next_fork_epoch = eth2next_fork_epoch, eth2_attnets = attnets else: info "ENR bootstrap address is wrong or incomplete", enr_uri = address else: info "ENR bootstrap address is wrong or incomplete", enr_uri = address func init*(p: typedesc[PeerInfo], enruri: EnrUri): Option[PeerInfo] {.inline.} = var rec: enr.Record if fromURI(rec, enruri): logEnrAddress(rec.toUri()) result = PeerInfo.init(rec) proc pubsubLogger(conf: InspectorConf, switch: Switch, resolveQueue: AsyncQueue[PeerID], topic: string, data: seq[byte]): Future[void] {.async, gcsafe.} = info "Received pubsub message", size = len(data), topic = topic, message = bu.toHex(data) var buffer: seq[byte] if conf.decode: if topic.endsWith("_snappy"): try: buffer = snappy.decode(data, GOSSIP_MAX_SIZE) except CatchableError as exc: warn "Unable to decompress message", errMsg = exc.msg else: buffer = data try: if topic.endsWith(topicBeaconBlocksSuffix & "_snappy"): info "SignedBeaconBlock", msg = SSZ.decode(buffer, SignedBeaconBlock) elif topic.endsWith("_snappy") and topic.contains("/beacon_attestation_"): info "Attestation", msg = SSZ.decode(buffer, Attestation) elif topic.endsWith(topicVoluntaryExitsSuffix & "_snappy"): info "SignedVoluntaryExit", msg = SSZ.decode(buffer, SignedVoluntaryExit) elif topic.endsWith(topicProposerSlashingsSuffix & "_snappy"): info "ProposerSlashing", msg = SSZ.decode(buffer, ProposerSlashing) elif topic.endsWith(topicAttesterSlashingsSuffix & "_snappy"): info "AttesterSlashing", msg = SSZ.decode(buffer, AttesterSlashing) elif topic.endsWith(topicAggregateAndProofsSuffix & "_snappy"): info "AggregateAndProof", msg = SSZ.decode(buffer, AggregateAndProof) except CatchableError as exc: info "Unable to decode message", errMsg = exc.msg proc resolveLoop(conf: InspectorConf, discovery: DiscoveryProtocol, switch: Switch, peerQueue: AsyncQueue[PeerID], peers: TableRef[PeerID, PeerInfo]) {.async.} = debug "Starting resolution loop" while true: let peerId = await peerQueue.popFirst() let idOpt = peerId.toNodeId() if idOpt.isSome(): try: let nodeOpt = await discovery.resolve(idOpt.get()) if nodeOpt.isSome(): let peerOpt = PeerInfo.init(nodeOpt.get().record) if peerOpt.isOk(): let peer = peerOpt.get() trace "Peer resolved", peer_id = peerId, node_id = idOpt.get(), peer_info = peer peers[peerId] = peer else: warn "Peer's record is invalid", peer_id = peerId, node_id = idOpt.get(), peer_record = nodeOpt.get().record else: trace "Node resolution returns empty answer", peer_id = peerId, node_id = idOpt.get() except CatchableError as exc: warn "Node address resolution failed", errMsg = exc.msg, peer_id = peerId, node_id = idOpt.get() proc discoveryLoop(conf: InspectorConf, discovery: DiscoveryProtocol, switch: Switch, connQueue: AsyncQueue[PeerInfo], peers: TableRef[PeerID, PeerInfo]) {.async.} = debug "Starting discovery loop" let wantedPeers = conf.maxPeers while true: try: let discoveredPeers = discovery.randomNodes(wantedPeers - len(peers)) for peer in discoveredPeers: let pinfoOpt = PeerInfo.init(peer.record) if pinfoOpt.isOk(): let pinfo = pinfoOpt.get() if pinfo.hasTCP(): if not switch.isConnected(pinfo.peerId): debug "Discovered new peer", peer = pinfo, peers_count = len(peers) await connQueue.addLast(pinfo) else: debug "Found discovery only peer", peer = pinfo except CatchableError as exc: debug "Error in discovery", errMsg = exc.msg await sleepAsync(1.seconds) proc run(conf: InspectorConf) {.async.} = var topics: set[TopicFilter] = {} forkDigest: Option[ForkDigest] enrFields: Option[ENRFieldPair] var pubsubPeers = newTable[PeerID, PeerInfo]() var resolveQueue = newAsyncQueue[PeerID](10) var connectQueue = newAsyncQueue[PeerInfo](10) let rng = lcrypto.newRng() let bootnodes = loadBootstrapNodes(conf) if len(bootnodes) == 0: error "Not enough bootnodes to establish connection with network" quit(1) var eth2bootnodes = newSeq[PeerInfo]() var disc5bootnodes = newSeq[enr.Record]() for item in bootnodes: if item.kind == BootstrapKind.Enr: logEnrAddress(item.addressRec.toUri()) let pinfoOpt = PeerInfo.init(item.addressRec) if pinfoOpt.isOk(): let pinfo = pinfoOpt.get() for ma in pinfo.addrs: if TCP.match(ma): eth2bootnodes.add(pinfo) break for ma in pinfo.addrs: if UDP.match(ma): disc5bootnodes.add(item.addressRec) break let forkOpt = tryGetForkDigest(item.addressRec) if forkOpt.isSome(): if forkDigest.isSome(): if forkDigest.get() != forkOpt.get(): warn "Bootstrap node address has different forkDigest", address = item.addressRec.toUri(), address_fork_digest = $(forkOpt.get()), stored_fork_digest = $(forkDigest.get()) else: forkDigest = forkOpt let enrFieldsOpt = tryGetFieldPairs(item.addressRec) if enrFieldsOpt.isSome(): if enrFields.isSome(): if enrFields.get() != enrFieldsOpt.get(): warn "Bootstrap node address has different eth2 values", address = item.addressRec.toUri(), eth2_field_stored = bu.toHex(enrFields.get().eth2), eth2_field_address = bu.toHex(enrFieldsOpt.get().eth2) else: enrFields = enrFieldsOpt elif item.kind == BootstrapKind.MultiAddr: if ETH2BN.match(item.addressMa): eth2bootnodes.add(PeerInfo.init(item.addressMa).get()) if len(eth2bootnodes) == 0: error "Not enough Ethereum2 bootnodes to establish connection with network" quit(1) if len(disc5bootnodes) == 0: warn "Not enough DiscoveryV5 bootnodes, discovery will be disabled" var argForkDigest = tryGetForkDigest(conf.forkDigest) if forkDigest.isNone(): if argForkDigest.isNone(): error "forkDigest argument and bootstrap forkDigest are missing" quit(1) else: forkDigest = argForkDigest else: if argForkDigest.isSome(): if forkDigest.isSome() != argForkDigest.isSome(): warn "forkDigest argument value is different, using argument value", argument_fork_digest = argForkDigest.get(), bootstrap_fork_digest = forkDigest.get() forkDigest = argForkDigest let seckey = lcrypto.PrivateKey.random(PKScheme.Secp256k1, rng[]).tryGet() # let pubkey = seckey.getKey() let hostAddress = tryGetMultiAddress(conf.bindAddress) if hostAddress.isNone(): error "Bind address is incorrect MultiAddress", address = conf.bindAddress quit(1) let switch = newStandardSwitch(some(seckey), hostAddress.get(), rng = rng) let pubsub = GossipSub.init( switch = switch, triggerSelf = true, sign = false, verifySignature = false).PubSub switch.mount(pubsub) if len(conf.topics) > 0: for item in conf.topics: let lcitem = item.toLowerAscii() if lcitem == "*": topics.incl({TopicFilter.Blocks, TopicFilter.Attestations, TopicFilter.Exits, TopicFilter.ProposerSlashing, TopicFilter.AttesterSlashings}) break elif lcitem == "a": topics.incl(TopicFilter.Attestations) elif lcitem == "b": topics.incl(TopicFilter.Blocks) elif lcitem == "e": topics.incl(TopicFilter.Exits) elif lcitem == "ps": topics.incl(TopicFilter.ProposerSlashing) elif lcitem == "as": topics.incl(TopicFilter.AttesterSlashings) else: discard else: topics.incl({TopicFilter.Blocks, TopicFilter.Attestations, TopicFilter.Exits, TopicFilter.ProposerSlashing, TopicFilter.AttesterSlashings}) proc pubsubTrampoline(topic: string, data: seq[byte]): Future[void] {.gcsafe.} = result = pubsubLogger(conf, switch, resolveQueue, topic, data) discard await switch.start() await pubsub.start() var topicFilters = newSeq[string]() try: for filter in topics: for topic in getTopics(forkDigest.get(), filter): await pubsub.subscribe(topic, pubsubTrampoline) topicFilters.add(topic) trace "Subscribed to topic", topic = topic for filter in conf.customTopics: await pubsub.subscribe(filter, pubsubTrampoline) topicFilters.add(filter) trace "Subscribed to custom topic", topic = filter except CatchableError as exc: error "Could not subscribe to topics", errMsg = exc.msg quit(1) info InspectorIdent & " starting", topic_filters = topicFilters, eth2_bootnodes = eth2bootnodes, disc5_bootnodes = disc5bootnodes asyncCheck connectLoop(switch, connectQueue, pubsubPeers, 10.seconds) for node in eth2bootnodes: await connectQueue.addLast(node) if len(disc5bootnodes) > 0: var proto = bootstrapDiscovery(conf, hostAddress.get(), seckey, disc5bootnodes, enrFields) if not(conf.noDiscovery): asyncCheck discoveryLoop(conf, proto, switch, connectQueue, pubsubPeers) asyncCheck resolveLoop(conf, proto, switch, resolveQueue, pubsubPeers) # We are not going to exit from this procedure var emptyFut = newFuture[void]() await emptyFut when isMainModule: echo InspectorHeader var conf = InspectorConf.load(version = InspectorVersion) waitFor run(conf)