import net, sequtils, options, tables, osproc, random, strutils, times, std_shims/[os_shims, objects], chronos, chronicles, confutils, serialization/errors, eth/trie/db, eth/trie/backends/rocksdb_backend, eth/async_utils, spec/[bitfield, datatypes, digest, crypto, beaconstate, helpers, validator], conf, time, state_transition, fork_choice, ssz, beacon_chain_db, validator_pool, extras, attestation_pool, block_pool, eth2_network, beacon_node_types, mainchain_monitor, trusted_state_snapshots, version const topicBeaconBlocks = "ethereum/2.1/beacon_chain/blocks" topicAttestations = "ethereum/2.1/beacon_chain/attestations" dataDirValidators = "validators" networkMetadataFile = "network.json" genesisFile = "genesis.json" testnetsBaseUrl = "https://serenity-testnets.status.im" # ################################################# # Careful handling of beacon_node <-> sync_protocol # to avoid recursive dependencies proc onBeaconBlock*(node: BeaconNode, blck: BeaconBlock) {.gcsafe.} # Forward decl for sync_protocol import sync_protocol, request_manager # ################################################# func shortValidatorKey(node: BeaconNode, validatorIdx: int): string = ($node.state.data.validator_registry[validatorIdx].pubkey)[0..7] func localValidatorsDir(conf: BeaconNodeConf): string = conf.dataDir / "validators" func databaseDir(conf: BeaconNodeConf): string = conf.dataDir / "db" template `//`(url, fragment: string): string = url & "/" & fragment proc downloadFile(url: string): Future[string] {.async.} = let (fileContents, errorCode) = execCmdEx("curl --fail " & url, options = {poUsePath}) if errorCode != 0: raise newException(IOError, "Failed to download URL: " & url & "\n" & fileContents) return fileContents proc updateTestnetMetadata(conf: BeaconNodeConf): Future[NetworkMetadata] {.async.} = let latestMetadata = await downloadFile(testnetsBaseUrl // $conf.network // netBackendName & "-" & networkMetadataFile) result = Json.decode(latestMetadata, NetworkMetadata) let localMetadataFile = conf.dataDir / networkMetadataFile if fileExists(localMetadataFile) and readFile(localMetadataFile).string == latestMetadata: return info "New testnet genesis data received. Starting with a fresh database." createDir conf.dataDir.string removeDir conf.databaseDir writeFile localMetadataFile, latestMetadata let newGenesis = await downloadFile(testnetsBaseUrl // $conf.network // genesisFile) writeFile conf.dataDir / genesisFile, newGenesis proc obtainTestnetKey(conf: BeaconNodeConf): Future[(string, string)] {.async.} = let metadata = await updateTestnetMetadata(conf) privKeyName = validatorFileBaseName(rand(metadata.userValidatorsRange)) & ".privkey" privKeyUrl = testnetsBaseUrl // $conf.network // privKeyName privKeyContent = strip await downloadFile(privKeyUrl) let key = ValidatorPrivKey.init(privKeyContent) return (privKeyName, privKeyContent) proc saveValidatorKey(keyName, key: string, conf: BeaconNodeConf) = let validatorsDir = conf.dataDir / dataDirValidators let outputFile = validatorsDir / keyName createDir validatorsDir writeFile(outputFile, key) info "Imported validator key", file = outputFile proc persistentNodeId*(conf: BeaconNodeConf): string = ($ensureNetworkKeys(conf).pubKey)[0..5] proc init*(T: type BeaconNode, conf: BeaconNodeConf): Future[BeaconNode] {.async.} = new result result.config = conf result.nickname = if conf.nodename == "auto": persistentNodeId(conf) else: conf.nodename template fail(args: varargs[untyped]) = stderr.write args, "\n" quit 1 case conf.network of "mainnet": fail "The Serenity mainnet hasn't been launched yet" of "testnet0", "testnet1": result.networkMetadata = await updateTestnetMetadata(conf) else: try: result.networkMetadata = Json.loadFile(conf.network, NetworkMetadata) except: fail "Failed to load network metadata: ", getCurrentExceptionMsg() var metadataErrorMsg = "" template checkCompatibility(metadataField, LOCAL_CONSTANT) = let metadataValue = metadataField if metadataValue != LOCAL_CONSTANT: if metadataErrorMsg.len > 0: metadataErrorMsg.add " and" metadataErrorMsg.add " -d:" & astToStr(LOCAL_CONSTANT) & "=" & $metadataValue & " (instead of " & $LOCAL_CONSTANT & ")" checkCompatibility result.networkMetadata.numShards , SHARD_COUNT checkCompatibility result.networkMetadata.slotDuration , SECONDS_PER_SLOT checkCompatibility result.networkMetadata.slotsPerEpoch , SLOTS_PER_EPOCH if metadataErrorMsg.len > 0: fail "To connect to the ", conf.network, " network, please compile with", metadataErrorMsg result.attachedValidators = ValidatorPool.init init result.mainchainMonitor, "", Port(0) # TODO: specify geth address and port let trieDB = trieDB newChainDb(string conf.databaseDir) result.db = BeaconChainDB.init(trieDB) # TODO this is problably not the right place to ensure that db is sane.. # TODO does it really make sense to load from DB if a state snapshot has been # specified on command line? potentially, this should be the other way # around... let headBlock = result.db.getHeadBlock() if headBlock.isNone(): var snapshotFile = conf.dataDir / genesisFile if conf.stateSnapshot.isSome: snapshotFile = conf.stateSnapshot.get.string elif not fileExists(snapshotFile): error "Nimbus database not initialized. Please specify the initial state snapshot file." quit 1 try: info "Importing snapshot file", path = snapshotFile let tailState = Json.loadFile(snapshotFile, BeaconState) tailBlock = get_initial_beacon_block(tailState) BlockPool.preInit(result.db, tailState, tailBlock) except SerializationError as err: stderr.write "Failed to import ", snapshotFile, "\n" stderr.write err.formatMsg(snapshotFile), "\n" quit 1 except: stderr.write "Failed to initialize database\n" stderr.write getCurrentExceptionMsg(), "\n" quit 1 result.blockPool = BlockPool.init(result.db) result.attestationPool = AttestationPool.init(result.blockPool) result.network = await createEth2Node(conf) result.requestManager.init result.network # TODO sync is called when a remote peer is connected - is that the right # time to do so? let sync = result.network.protocolState(BeaconSync) sync.networkId = result.networkMetadata.networkId sync.node = result sync.db = result.db let head = result.blockPool.get(result.db.getHeadBlock().get()) result.state = result.blockPool.loadTailState() result.justifiedStateCache = result.state let addressFile = string(conf.dataDir) / "beacon_node.address" result.network.saveConnectionAddressFile(addressFile) result.beaconClock = BeaconClock.init(result.state.data) proc connectToNetwork(node: BeaconNode) {.async.} = let localKeys = ensureNetworkKeys(node.config) var bootstrapNodes = newSeq[BootstrapAddr]() for bootNode in node.networkMetadata.bootstrapNodes: if bootNode.pubkey == localKeys.pubKey: node.isBootstrapNode = true else: bootstrapNodes.add bootNode for bootNode in node.config.bootstrapNodes: bootstrapNodes.add BootstrapAddr.init(bootNode) let bootstrapFile = string node.config.bootstrapNodesFile if bootstrapFile.len > 0: for ln in lines(bootstrapFile): bootstrapNodes.add BootstrapAddr.init(string ln) if bootstrapNodes.len > 0: info "Connecting to bootstrap nodes", bootstrapNodes else: info "Waiting for connections" await node.network.connectToNetwork(bootstrapNodes) template findIt(s: openarray, predicate: untyped): int = var res = -1 for i, it {.inject.} in s: if predicate: res = i break res proc addLocalValidator(node: BeaconNode, validatorKey: ValidatorPrivKey) = let pubKey = validatorKey.pubKey() let idx = node.state.data.validator_registry.findIt(it.pubKey == pubKey) if idx == -1: warn "Validator not in registry", pubKey else: debug "Attaching validator", validator = shortValidatorKey(node, idx), idx, pubKey node.attachedValidators.addLocalValidator(idx, pubKey, validatorKey) proc addLocalValidators(node: BeaconNode) = for validatorKeyFile in node.config.validators: node.addLocalValidator validatorKeyFile.load for kind, file in walkDir(node.config.localValidatorsDir): if kind in {pcFile, pcLinkToFile}: node.addLocalValidator ValidatorPrivKey.init(readFile(file).string) info "Local validators attached ", count = node.attachedValidators.count proc getAttachedValidator(node: BeaconNode, idx: int): AttachedValidator = let validatorKey = node.state.data.validator_registry[idx].pubkey return node.attachedValidators.getValidator(validatorKey) proc updateHead(node: BeaconNode, slot: Slot): BlockRef = # Use head state for attestation resolution below # TODO do we need to resolve attestations using all available head states? node.blockPool.updateState( node.state, BlockSlot(blck: node.blockPool.head, slot: slot)) # Check pending attestations - maybe we found some blocks for them node.attestationPool.resolve(node.state.data) # TODO move all of this logic to BlockPool debug "Preparing for fork choice", stateRoot = shortLog(node.state.root), connectedPeers = node.network.connectedPeers, stateSlot = humaneSlotNum(node.state.data.slot), stateEpoch = humaneEpochNum(node.state.data.slot.slotToEpoch) let justifiedHead = node.blockPool.latestJustifiedBlock() # TODO slot number is wrong here, it should be the start of the epoch that # got finalized: # https://github.com/ethereum/eth2.0-specs/issues/768 node.blockPool.updateState( node.justifiedStateCache, BlockSlot(blck: justifiedHead, slot: justifiedHead.slot)) let newHead = lmdGhost( node.attestationPool, node.justifiedStateCache.data, justifiedHead) info "Fork chosen", newHeadSlot = humaneSlotNum(newHead.slot), newHeadEpoch = humaneEpochNum(newHead.slot.slotToEpoch), newHeadBlockRoot = shortLog(newHead.root) node.blockPool.updateHead(node.state, newHead) newHead proc makeAttestation(node: BeaconNode, validator: AttachedValidator, state: BeaconState, head: BlockRef, shard: uint64, committeeLen: int, indexInCommittee: int) {.async.} = # TODO - move that to "updateState" # Epoch underflow - https://github.com/status-im/nim-beacon-chain/issues/207 doAssert node.state.data.current_justified_epoch != GENESIS_EPOCH - 1, "Underflow in justified epoch field before making attestation" let attestationData = makeAttestationData(state, shard, head.root) # Careful - after await. node.state (etc) might have changed in async race validatorSignature = await validator.signAttestation(attestationData) var aggregationBitfield = BitField.init(committeeLen) set_bitfield_bit(aggregationBitfield, indexInCommittee) var attestation = Attestation( data: attestationData, aggregate_signature: validatorSignature, aggregation_bitfield: aggregationBitfield, # Stub in phase0 custody_bitfield: BitField.init(committeeLen) ) node.network.broadcast(topicAttestations, attestation) info "Attestation sent", attestationData = shortLog(attestationData), validator = shortValidatorKey(node, validator.idx), signature = shortLog(validatorSignature) proc proposeBlock(node: BeaconNode, validator: AttachedValidator, head: BlockRef, slot: Slot): Future[BlockRef] {.async.} = if head.slot > slot: notice "Skipping proposal, we've already selected a newer head", headSlot = humaneSlotNum(head.slot), headBlockRoot = shortLog(head.root), slot = humaneSlotNum(slot) return head if head.slot == slot: # Weird, we should never see as head the same slot as we're proposing a # block for - did someone else steal our slot? why didn't we discard it? warn "Found head at same slot as we're supposed to propose for!", headSlot = humaneSlotNum(head.slot), headBlockRoot = shortLog(head.root) # TODO investigate how and when this happens.. maybe it shouldn't be an # assert? doAssert false, "head slot matches proposal slot (!)" # return node.blockPool.updateState(node.state, BlockSlot(blck: head, slot: slot - 1)) # To create a block, we'll first apply a partial block to the state, skipping # some validations. let blockBody = BeaconBlockBody( randao_reveal: validator.genRandaoReveal(node.state.data, slot), eth1_data: node.mainchainMonitor.getBeaconBlockRef(), attestations: node.attestationPool.getAttestationsForBlock(slot)) var newBlock = BeaconBlock( slot: slot, previous_block_root: head.root, body: blockBody, signature: ValidatorSig(), # we need the rest of the block first! ) let ok = updateState(node.state.data, newBlock, {skipValidation}) doAssert ok # TODO: err, could this fail somehow? node.state.root = hash_tree_root(node.state.data) newBlock.state_root = node.state.root newBlock.signature = await validator.signBlockProposal(node.state.data.fork, newBlock) let blockRoot = signed_root(newBlock) let newBlockRef = node.blockPool.add(node.state, blockRoot, newBlock) if newBlockRef == nil: warn "Unable to add proposed block to block pool", newBlock = shortLog(newBlock), blockRoot = shortLog(blockRoot) return head info "Block proposed", blck = shortLog(newBlock), blockRoot = shortLog(newBlockRef.root), validator = shortValidatorKey(node, validator.idx), idx = validator.idx node.network.broadcast(topicBeaconBlocks, newBlock) return newBlockRef proc onAttestation(node: BeaconNode, attestation: Attestation) = # We received an attestation from the network but don't know much about it # yet - in particular, we haven't verified that it belongs to particular chain # we're on, or that it follows the rules of the protocol debug "Attestation received", attestationData = shortLog(attestation.data), signature = shortLog(attestation.aggregate_signature) node.attestationPool.add(node.state.data, attestation) proc onBeaconBlock(node: BeaconNode, blck: BeaconBlock) = # We received a block but don't know much about it yet - in particular, we # don't know if it's part of the chain we're currently building. let blockRoot = signed_root(blck) debug "Block received", blck = shortLog(blck), blockRoot = shortLog(blockRoot) if node.blockPool.add(node.state, blockRoot, blck).isNil: return # The block we received contains attestations, and we might not yet know about # all of them. Let's add them to the attestation pool - in case they block # is not yet resolved, neither will the attestations be! for attestation in blck.body.attestations: # TODO attestation pool needs to be taught to deal with overlapping # attestations! discard # node.onAttestation(attestation) proc handleAttestations(node: BeaconNode, head: BlockRef, slot: Slot) = ## Perform all attestations that the validators attached to this node should ## perform during the given slot if slot + SLOTS_PER_EPOCH < head.slot: # The latest block we know about is a lot newer than the slot we're being # asked to attest to - this makes it unlikely that it will be included # at all. # TODO the oldest attestations allowed are those that are older than the # finalized epoch.. also, it seems that posting very old attestations # is risky from a slashing perspective. More work is needed here. notice "Skipping attestation, head is too recent", headSlot = humaneSlotNum(head.slot), slot = humaneSlotNum(slot) return let attestationHead = head.findAncestorBySlot(slot) if head != attestationHead: # In rare cases, such as when we're busy syncing or just slow, we'll be # attesting to a past state - we must then recreate the world as it looked # like back then notice "Attesting to a state in the past, falling behind?", headSlot = humaneSlotNum(head.slot), attestationHeadSlot = humaneSlotNum(attestationHead.slot), attestationSlot = humaneSlotNum(slot) debug "Checking attestations", attestationHeadRoot = shortLog(attestationHead.root), attestationSlot = humaneSlotNum(slot) # We need to run attestations exactly for the slot that we're attesting to. # In case blocks went missing, this means advancing past the latest block # using empty slots as fillers. node.blockPool.updateState( node.state, BlockSlot(blck: attestationHead, slot: slot)) for crosslink_committee in get_crosslink_committees_at_slot( node.state.data, slot): for i, validatorIdx in crosslink_committee.committee: let validator = node.getAttachedValidator(validatorIdx) if validator != nil: traceAsyncErrors makeAttestation( node, validator, node.state.data, head, crosslink_committee.shard, crosslink_committee.committee.len, i) proc handleProposal(node: BeaconNode, head: BlockRef, slot: Slot): Future[BlockRef] {.async.} = ## Perform the proposal for the given slot, iff we have a validator attached ## that is supposed to do so, given the shuffling in head # TODO here we advanced the state to the new slot, but later we'll be # proposing for it - basically, we're selecting proposer based on an # empty slot.. wait for the committee selection to settle, then # revisit this - we should be able to advance behind node.blockPool.updateState(node.state, BlockSlot(blck: head, slot: slot)) let proposerIdx = get_beacon_proposer_index(node.state.data, slot) let validator = node.getAttachedValidator(proposerIdx) if validator != nil: # TODO: # Warm-up the proposer earlier to try to obtain previous # missing blocks if necessary return await proposeBlock(node, validator, head, slot) debug "Expecting proposal", headRoot = shortLog(head.root), slot = humaneSlotNum(slot), proposer = shortValidatorKey(node.state.data, proposerIdx) return head proc onSlotStart(node: BeaconNode, lastSlot, scheduledSlot: Slot) {.gcsafe, async.} = ## Called at the beginning of a slot - usually every slot, but sometimes might ## skip a few in case we're running late. ## lastSlot: the last slot that we sucessfully processed, so we know where to ## start work from ## scheduledSlot: the slot that we were aiming for, in terms of timing let # The slot we should be at, according to the clock slot = node.beaconClock.now().toSlot() nextSlot = slot + 1 debug "Slot start", lastSlot = humaneSlotNum(lastSlot), scheduledSlot = humaneSlotNum(scheduledSlot), slot = humaneSlotNum(slot) if slot < lastSlot: # This can happen if the system clock changes time for example, and it's # pretty bad # TODO shut down? time either was or is bad, and PoS relies on accuracy.. warn "Beacon clock time moved back, rescheduling slot actions", slot = humaneSlotNum(slot), scheduledSlot = humaneSlotNum(scheduledSlot) addTimer(saturate(node.beaconClock.fromNow(nextSlot))) do (p: pointer): asyncCheck node.onSlotStart(slot, nextSlot) return if slot > lastSlot + SLOTS_PER_EPOCH: # We've fallen behind more than an epoch - there's nothing clever we can # do here really, except skip all the work and try again later. # TODO how long should the period be? Using an epoch because that's roughly # how long attestations remain interesting # TODO should we shut down instead? clearly we're unable to keep up warn "Unable to keep up, skipping ahead without doing work", lastSlot = humaneSlotNum(lastSlot), slot = humaneSlotNum(slot), scheduledSlot = humaneSlotNum(scheduledSlot) addTimer(saturate(node.beaconClock.fromNow(nextSlot))) do (p: pointer): # We pass the current slot here to indicate that work should be skipped! asyncCheck node.onSlotStart(slot, nextSlot) return # Whatever we do during the slot, we need to know the head, because this will # give us a state to work with and thus a shuffling. # TODO typically, what consitutes correct actions stays constant between slot # updates and is stable across some epoch transitions as well - see how # we can avoid recalculating everything here var head = node.updateHead(slot) # TODO if the head is very old, that is indicative of something being very # wrong - us being out of sync or disconnected from the network - need # to consider what to do in that case: # * nothing - the other parts of the application will reconnect and # start listening to broadcasts, learn a new head etc.. # risky, because the network might stall if everyone does # this, because no blocks will be produced # * shut down - this allows the user to notice and take action, but is # kind of harsh # * keep going - we create blocks and attestations as usual and send them # out - if network conditions improve, fork choice should # eventually select the correct head and the rest will # disappear naturally - risky because user is not aware, # and might lose stake on canonical chain but "just works" # when reconnected.. # Right now, we keep going var curSlot = lastSlot + 1 while curSlot < slot: # Timers may be delayed because we're busy processing, and we might have # more work to do. We'll try to do so in an expedited way. # TODO maybe even collect all work synchronously to avoid unnecessary # state rewinds while waiting for async operations like validator # signature.. notice "Catching up", curSlot = humaneSlotNum(curSlot), lastSlot = humaneSlotNum(lastSlot), slot = humaneSlotNum(slot) # For every slot we're catching up, we'll propose then send # attestations - head should normally be advancing along the same branch # in this case # TODO what if we receive blocks / attestations while doing this work? head = await handleProposal(node, head, curSlot) # For each slot we missed, we need to send out attestations - if we were # proposing during this time, we'll use the newly proposed head, else just # keep reusing the same - the attestation that goes out will actually # rewind the state to what it looked like at the time of that slot # TODO smells like there's an optimization opportunity here handleAttestations(node, head, curSlot) curSlot += 1 head = await handleProposal(node, head, slot) # We've been doing lots of work up until now which took time. Normally, we # send out attestations at the slot mid-point, so we go back to the clock # to see how much time we need to wait. # TODO the beacon clock might jump here also. It's probably easier to complete # the work for the whole slot using a monotonic clock instead, then deal # with any clock discrepancies once only, at the start of slot timer # processing.. let attestationStart = node.beaconClock.fromNow(slot) halfSlot = seconds(int64(SECONDS_PER_SLOT div 2)) if attestationStart.inFuture or attestationStart.offset <= halfSlot: let fromNow = if attestationStart.inFuture: attestationStart.offset + halfSlot else: halfSlot - attestationStart.offset debug "Waiting to send attestations", slot = humaneSlotNum(slot), fromNow = shortLog(fromNow) await sleepAsync(fromNow) # Time passed - we might need to select a new head in that case head = node.updateHead(slot) handleAttestations(node, head, slot) # TODO ... and beacon clock might jump here also. sigh. let nextSlotStart = saturate(node.beaconClock.fromNow(nextSlot)) info "Scheduling slot actions", lastSlot = humaneSlotNum(slot), slot = humaneSlotNum(slot), nextSlot = humaneSlotNum(nextSlot), fromNow = shortLog(nextSlotStart) addTimer(nextSlotStart) do (p: pointer): asyncCheck node.onSlotStart(slot, nextSlot) proc onSecond(node: BeaconNode, moment: Moment) {.async.} = let missingBlocks = node.blockPool.checkUnresolved() if missingBlocks.len > 0: info "Requesting detected missing blocks", missingBlocks node.requestManager.fetchAncestorBlocks(missingBlocks) do (b: BeaconBlock): node.onBeaconBlock(b) let nextSecond = max(Moment.now(), moment + chronos.seconds(1)) addTimer(nextSecond) do (p: pointer): asyncCheck node.onSecond(nextSecond) proc run*(node: BeaconNode) = waitFor node.network.subscribe(topicBeaconBlocks) do (blck: BeaconBlock): node.onBeaconBlock(blck) waitFor node.network.subscribe(topicAttestations) do (attestation: Attestation): node.onAttestation(attestation) let slot = node.beaconClock.now().toSlot() startSlot = if slot >= GENESIS_SLOT: slot + 1 else: GENESIS_SLOT + 1 fromNow = saturate(node.beaconClock.fromNow(startSlot)) info "Scheduling first slot action", nextSlot = humaneSlotNum(startSlot), fromNow = shortLog(fromNow) addTimer(fromNow) do (p: pointer): asyncCheck node.onSlotStart(startSlot - 1, startSlot) let second = Moment.now() + chronos.seconds(1) addTimer(second) do (p: pointer): asyncCheck node.onSecond(second) runForever() var gPidFile: string proc createPidFile(filename: string) = createDir splitFile(filename).dir writeFile filename, $getCurrentProcessId() gPidFile = filename addQuitProc proc {.noconv.} = removeFile gPidFile proc start(node: BeaconNode) = # TODO: while it's nice to cheat by waiting for connections here, we # actually need to make this part of normal application flow - # losing all connections might happen at any time and we should be # prepared to handle it. waitFor node.connectToNetwork() info "Starting beacon node", slotsSinceFinalization = int64(node.blockPool.finalizedHead.slot) - int64(node.beaconClock.now()), stateSlot = humaneSlotNum(node.state.data.slot), SHARD_COUNT, SLOTS_PER_EPOCH, SECONDS_PER_SLOT, SPEC_VERSION node.addLocalValidators() node.run() when isMainModule: randomize() let config = BeaconNodeConf.load(version = fullVersionStr()) if config.logLevel != LogLevel.NONE: setLogLevel(config.logLevel) case config.cmd of createTestnet: var deposits: seq[Deposit] for i in config.firstValidator.int ..< config.totalValidators.int: let depositFile = config.validatorsDir / validatorFileBaseName(i) & ".deposit.json" deposits.add Json.loadFile(depositFile, Deposit) let initialState = get_genesis_beacon_state( deposits, uint64(times.toUnix(times.getTime()) + config.genesisOffset), Eth1Data(), {}) Json.saveFile(config.outputGenesis.string, initialState, pretty = true) echo "Wrote ", config.outputGenesis.string var bootstrapAddress = getPersistenBootstrapAddr( config, parseIpAddress(config.bootstrapAddress), Port config.bootstrapPort) testnetMetadata = NetworkMetadata( networkId: config.networkId, genesisRoot: hash_tree_root(initialState), bootstrapNodes: @[bootstrapAddress], numShards: SHARD_COUNT, slotDuration: SECONDS_PER_SLOT, slotsPerEpoch: SLOTS_PER_EPOCH, totalValidators: config.totalValidators, lastUserValidator: config.lastUserValidator) Json.saveFile(config.outputNetwork.string, testnetMetadata, pretty = true) echo "Wrote ", config.outputNetwork.string of updateTestnet: discard waitFor updateTestnetMetadata(config) of importValidator: template reportFailureFor(keyExpr) = error "Failed to import validator key", key = keyExpr programResult = 1 for keyFile in config.keyFiles: try: saveValidatorKey(keyFile.string.extractFilename, readFile(keyFile.string), config) except: reportFailureFor keyFile.string if config.keyFiles.len == 0: if config.network in ["testnet0", "testnet1"]: try: let (keyName, key) = waitFor obtainTestnetKey(config) saveValidatorKey(keyName, key, config) except: stderr.write "Failed to download key\n", getCurrentExceptionMsg() quit 1 else: echo "Validator keys can be downloaded only for testnets" quit 1 of noCommand: createPidFile(config.dataDir.string / "beacon_node.pid") var node = waitFor BeaconNode.init(config) if node.nickname != "": dynamicLogScope(node = node.nickname): node.start() else: node.start()