# beacon_chain # Copyright (c) 2018-2021 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 # Standard library std/[math, os, sequtils, strformat, strutils, tables, times, terminal, osproc], system/ansi_c, # Nimble packages stew/[objects, byteutils, endians2, io2], stew/shims/macros, chronos, confutils, metrics, json_rpc/[rpcclient, rpcserver, jsonmarshal], chronicles, bearssl, blscurve, json_serialization/std/[options, sets, net], serialization/errors, eth/[keys, async_utils], eth/net/nat, eth/db/[kvstore, kvstore_sqlite3], eth/p2p/enode, eth/p2p/discoveryv5/[protocol, enr, random2], # Local modules "."/[ beacon_chain_db, beacon_node_common, beacon_node_status, beacon_node_types, conf, extras, filepath, interop, nimbus_binary_common, ssz/merkleization, statusbar, beacon_clock, version], ./networking/[eth2_discovery, eth2_network, network_metadata], ./gossip_processing/[eth2_processor, gossip_to_consensus, consensus_manager], ./validators/[attestation_aggregation, validator_duties, validator_pool, slashing_protection, keystore_management], ./sync/[sync_manager, sync_protocol, request_manager], ./rpc/[beacon_api, config_api, debug_api, event_api, nimbus_api, node_api, validator_api], ./spec/[ datatypes, digest, crypto, beaconstate, eth2_apis/beacon_rpc_client, helpers, network, presets, validator, weak_subjectivity, signatures], ./consensus_object_pools/[blockchain_dag, block_quarantine, block_clearance, block_pools_types, attestation_pool, exit_pool], ./eth1/eth1_monitor from eth/common/eth_types import BlockHashOrNumber from libp2p/protocols/pubsub/gossipsub import TopicParams, validateParameters, init const hasPrompt = false and not defined(withoutPrompt) # disabled, doesn't work type RpcServer* = RpcHttpServer template init(T: type RpcHttpServer, ip: ValidIpAddress, port: Port): T = newRpcHttpServer([initTAddress(ip, port)]) # https://github.com/ethereum/eth2.0-metrics/blob/master/metrics.md#interop-metrics declareGauge beacon_slot, "Latest slot of the beacon chain state" declareGauge beacon_current_epoch, "Current epoch" # Finalization tracking declareGauge finalization_delay, "Epoch delay between scheduled epoch and finalized epoch" declareGauge ticks_delay, "How long does to take to run the onSecond loop" declareGauge next_action_wait, "Seconds until the next attestation will be sent" logScope: topics = "beacnde" func enrForkIdFromState(state: BeaconState): ENRForkID = let forkVer = state.fork.current_version forkDigest = compute_fork_digest(forkVer, state.genesis_validators_root) ENRForkID( fork_digest: forkDigest, next_fork_version: forkVer, next_fork_epoch: FAR_FUTURE_EPOCH) proc init*(T: type BeaconNode, runtimePreset: RuntimePreset, rng: ref BrHmacDrbgContext, config: BeaconNodeConf, depositContractAddress: Eth1Address, depositContractDeployedAt: BlockHashOrNumber, eth1Network: Option[Eth1Network], genesisStateContents: string, genesisDepositsSnapshotContents: string): BeaconNode = let db = BeaconChainDB.init(runtimePreset, config.databaseDir) var genesisState, checkpointState: ref BeaconState checkpointBlock: SignedBeaconBlock if config.finalizedCheckpointState.isSome: let checkpointStatePath = config.finalizedCheckpointState.get.string checkpointState = try: newClone(SSZ.loadFile(checkpointStatePath, BeaconState)) except SerializationError as err: fatal "Checkpoint state deserialization failed", err = formatMsg(err, checkpointStatePath) quit 1 except CatchableError as err: fatal "Failed to read checkpoint state file", err = err.msg quit 1 if config.finalizedCheckpointBlock.isNone: if checkpointState.slot > 0: fatal "Specifying a non-genesis --finalized-checkpoint-state requires specifying --finalized-checkpoint-block as well" quit 1 else: let checkpointBlockPath = config.finalizedCheckpointBlock.get.string try: checkpointBlock = SSZ.loadFile(checkpointBlockPath, SignedBeaconBlock) except SerializationError as err: fatal "Invalid checkpoint block", err = err.formatMsg(checkpointBlockPath) quit 1 except IOError as err: fatal "Failed to load the checkpoint block", err = err.msg quit 1 elif config.finalizedCheckpointBlock.isSome: # TODO We can download the state from somewhere in the future relying # on the trusted `state_root` appearing in the checkpoint block. fatal "--finalized-checkpoint-block cannot be specified without --finalized-checkpoint-state" quit 1 var eth1Monitor: Eth1Monitor if not ChainDAGRef.isInitialized(db): var tailState: ref BeaconState tailBlock: SignedBeaconBlock if genesisStateContents.len == 0 and checkpointState == nil: when hasGenesisDetection: if genesisDepositsSnapshotContents != nil: fatal "A deposits snapshot cannot be provided without also providing a matching beacon state snapshot" quit 1 # This is a fresh start without a known genesis state # (most likely, it hasn't arrived yet). We'll try to # obtain a genesis through the Eth1 deposits monitor: if config.web3Url.len == 0: fatal "Web3 URL not specified" quit 1 # TODO Could move this to a separate "GenesisMonitor" process or task # that would do only this - see Paul's proposal for this. let eth1MonitorRes = waitFor Eth1Monitor.init( runtimePreset, db, config.web3Url, depositContractAddress, depositContractDeployedAt, eth1Network) if eth1MonitorRes.isErr: fatal "Failed to start Eth1 monitor", reason = eth1MonitorRes.error, web3Url = config.web3Url, depositContractAddress, depositContractDeployedAt quit 1 else: eth1Monitor = eth1MonitorRes.get genesisState = waitFor eth1Monitor.waitGenesis() if bnStatus == BeaconNodeStatus.Stopping: return nil tailState = genesisState tailBlock = get_initial_beacon_block(genesisState[]) notice "Eth2 genesis state detected", genesisTime = genesisState.genesisTime, eth1Block = genesisState.eth1_data.block_hash, totalDeposits = genesisState.eth1_data.deposit_count else: fatal "The beacon node must be compiled with -d:has_genesis_detection " & "in order to support monitoring for genesis events" quit 1 elif genesisStateContents.len == 0: if checkpointState.slot == GENESIS_SLOT: genesisState = checkpointState tailState = checkpointState tailBlock = get_initial_beacon_block(genesisState[]) else: fatal "State checkpoints cannot be provided for a network without a known genesis state" quit 1 else: try: genesisState = newClone(SSZ.decode(genesisStateContents, BeaconState)) except CatchableError as err: raiseAssert "Invalid baked-in state: " & err.msg if checkpointState != nil: tailState = checkpointState tailBlock = checkpointBlock else: tailState = genesisState tailBlock = get_initial_beacon_block(genesisState[]) try: ChainDAGRef.preInit(db, genesisState[], tailState[], tailBlock) doAssert ChainDAGRef.isInitialized(db), "preInit should have initialized db" except CatchableError as e: error "Failed to initialize database", err = e.msg quit 1 info "Loading block dag from database", path = config.databaseDir let chainDagFlags = if config.verifyFinalization: {verifyFinalization} else: {} chainDag = ChainDAGRef.init(runtimePreset, db, chainDagFlags) beaconClock = BeaconClock.init(chainDag.headState.data.data) quarantine = QuarantineRef.init(rng) databaseGenesisValidatorsRoot = chainDag.headState.data.data.genesis_validators_root if genesisStateContents.len != 0: let networkGenesisValidatorsRoot = extractGenesisValidatorRootFromSnapshop(genesisStateContents) if networkGenesisValidatorsRoot != databaseGenesisValidatorsRoot: fatal "The specified --data-dir contains data for a different network", networkGenesisValidatorsRoot, databaseGenesisValidatorsRoot, dataDir = config.dataDir quit 1 if config.weakSubjectivityCheckpoint.isSome: let currentSlot = beaconClock.now.slotOrZero isCheckpointStale = not is_within_weak_subjectivity_period( currentSlot, chainDag.headState.data.data, config.weakSubjectivityCheckpoint.get) if isCheckpointStale: error "Weak subjectivity checkpoint is stale", currentSlot, checkpoint = config.weakSubjectivityCheckpoint.get, headStateSlot = chainDag.headState.data.data.slot quit 1 if checkpointState != nil: let checkpointGenesisValidatorsRoot = checkpointState[].genesis_validators_root if checkpointGenesisValidatorsRoot != databaseGenesisValidatorsRoot: fatal "The specified checkpoint state is intended for a different network", checkpointGenesisValidatorsRoot, databaseGenesisValidatorsRoot, dataDir = config.dataDir quit 1 chainDag.setTailState(checkpointState[], checkpointBlock) if eth1Monitor.isNil and config.web3Url.len > 0 and genesisDepositsSnapshotContents.len > 0: let genesisDepositsSnapshot = SSZ.decode(genesisDepositsSnapshotContents, DepositContractSnapshot) eth1Monitor = Eth1Monitor.init( runtimePreset, db, config.web3Url, depositContractAddress, genesisDepositsSnapshot, eth1Network) let rpcServer = if config.rpcEnabled: RpcServer.init(config.rpcAddress, config.rpcPort) else: nil let netKeys = getPersistentNetKeys(rng[], config) nickname = if config.nodeName == "auto": shortForm(netKeys) else: config.nodeName enrForkId = enrForkIdFromState(chainDag.headState.data.data) topicBeaconBlocks = getBeaconBlocksTopic(enrForkId.forkDigest) topicAggregateAndProofs = getAggregateAndProofsTopic(enrForkId.forkDigest) network = createEth2Node(rng, config, netKeys, enrForkId) attestationPool = newClone(AttestationPool.init(chainDag, quarantine)) exitPool = newClone(ExitPool.init(chainDag, quarantine)) slashingProtectionDB = case config.slashingDbKind of SlashingDbKind.v1: info "Loading slashing protection database", path = config.validatorsDir() SlashingProtectionDB.init( chainDag.headState.data.data.genesis_validators_root, config.validatorsDir(), "slashing_protection", modes = {kCompleteArchiveV1}, disagreementBehavior = kChooseV1 ) of SlashingDbKind.v2: info "Loading slashing protection database (v2)", path = config.validatorsDir() SlashingProtectionDB.init( chainDag.headState.data.data.genesis_validators_root, config.validatorsDir(), "slashing_protection" ) of SlashingDbKind.both: info "Loading slashing protection database (dual DB mode)", path = config.validatorsDir() SlashingProtectionDB.init( chainDag.headState.data.data.genesis_validators_root, config.validatorsDir(), "slashing_protection", modes = {kCompleteArchiveV1, kCompleteArchiveV2}, disagreementBehavior = kChooseV2 ) validatorPool = newClone(ValidatorPool.init(slashingProtectionDB)) consensusManager = ConsensusManager.new( chainDag, attestationPool, quarantine ) verifQueues = VerifQueueManager.new( config, consensusManager, proc(): BeaconTime = beaconClock.now()) processor = Eth2Processor.new( config, verifQueues, chainDag, attestationPool, exitPool, validatorPool, quarantine, proc(): BeaconTime = beaconClock.now()) var res = BeaconNode( nickname: nickname, graffitiBytes: if config.graffiti.isSome: config.graffiti.get.GraffitiBytes else: defaultGraffitiBytes(), network: network, netKeys: netKeys, db: db, config: config, chainDag: chainDag, quarantine: quarantine, attestationPool: attestationPool, attachedValidators: validatorPool, exitPool: exitPool, eth1Monitor: eth1Monitor, beaconClock: beaconClock, rpcServer: rpcServer, forkDigest: enrForkId.forkDigest, topicBeaconBlocks: topicBeaconBlocks, topicAggregateAndProofs: topicAggregateAndProofs, processor: processor, verifQueues: verifQueues, consensusManager: consensusManager, requestManager: RequestManager.init(network, verifQueues) ) # set topic validation routine network.setValidTopics( block: var topics = @[ topicBeaconBlocks, getAttesterSlashingsTopic(enrForkId.forkDigest), getProposerSlashingsTopic(enrForkId.forkDigest), getVoluntaryExitsTopic(enrForkId.forkDigest), getAggregateAndProofsTopic(enrForkId.forkDigest) ] for subnet in 0'u64 ..< ATTESTATION_SUBNET_COUNT: topics &= getAttestationTopic(enrForkId.forkDigest, subnet) topics) if res.config.inProcessValidators: res.addLocalValidators() else: let cmd = getAppDir() / "nimbus_signing_process".addFileExt(ExeExt) let args = [$res.config.validatorsDir, $res.config.secretsDir] let workdir = io2.getCurrentDir().tryGet() res.vcProcess = startProcess(cmd, workdir, args) res.addRemoteValidators() # This merely configures the BeaconSync # The traffic will be started when we join the network. network.initBeaconSync(chainDag, enrForkId.forkDigest) res.updateValidatorMetrics() return res func verifyFinalization(node: BeaconNode, slot: Slot) = # Epoch must be >= 4 to check finalization const SETTLING_TIME_OFFSET = 1'u64 let epoch = slot.compute_epoch_at_slot() # Don't static-assert this -- if this isn't called, don't require it doAssert SLOTS_PER_EPOCH > SETTLING_TIME_OFFSET # Intentionally, loudly assert. Point is to fail visibly and unignorably # during testing. if epoch >= 4 and slot mod SLOTS_PER_EPOCH > SETTLING_TIME_OFFSET: let finalizedEpoch = node.chainDag.finalizedHead.slot.compute_epoch_at_slot() # Finalization rule 234, that has the most lag slots among the cases, sets # state.finalized_checkpoint = old_previous_justified_checkpoint.epoch + 3 # and then state.slot gets incremented, to increase the maximum offset, if # finalization occurs every slot, to 4 slots vs scheduledSlot. doAssert finalizedEpoch + 4 >= epoch proc installAttestationSubnetHandlers(node: BeaconNode, subnets: set[uint8]) = # https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/p2p-interface.md#attestations-and-aggregation # nimbus won't score attestation subnets for now, we just rely on block and aggregate which are more stabe and reliable for subnet in subnets: node.network.subscribe(getAttestationTopic(node.forkDigest, subnet), TopicParams.init()) # don't score attestation subnets for now proc updateStabilitySubnetMetadata( node: BeaconNode, stabilitySubnets: set[uint8]) = # https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/p2p-interface.md#metadata node.network.metadata.seq_number += 1 for subnet in 0'u8 ..< ATTESTATION_SUBNET_COUNT: node.network.metadata.attnets[subnet] = (subnet in stabilitySubnets) # https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/validator.md#phase-0-attestation-subnet-stability # https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/p2p-interface.md#attestation-subnet-bitfield let res = node.network.discovery.updateRecord( {"attnets": SSZ.encode(node.network.metadata.attnets)}) if res.isErr(): # This should not occur in this scenario as the private key would always # be the correct one and the ENR will not increase in size. warn "Failed to update record on subnet cycle", error = res.error else: debug "Stability subnets changed; updated ENR attnets", stabilitySubnets func getStabilitySubnets(stabilitySubnets: auto): set[uint8] = for subnetInfo in stabilitySubnets: result.incl subnetInfo.subnet proc getAttachedValidators(node: BeaconNode): Table[ValidatorIndex, AttachedValidator] = for validatorIndex in 0 ..< node.chainDag.headState.data.data.validators.len: let attachedValidator = node.getAttachedValidator( node.chainDag.headState.data.data, validatorIndex.ValidatorIndex) if attachedValidator.isNil: continue result[validatorIndex.ValidatorIndex] = attachedValidator proc updateSubscriptionSchedule(node: BeaconNode, epoch: Epoch) {.async.} = doAssert epoch >= 1 let attachedValidators = node.getAttachedValidators() validatorIndices = toIntSet(toSeq(attachedValidators.keys())) var cache = StateCache() # https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/validator.md#lookahead # Only subscribe when this node should aggregate; libp2p broadcasting works # on subnet topics regardless. # # Committee sizes in any given epoch vary by 1, i.e. committee sizes $n$ # $n+1$ can exist. Furthermore, according to # https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/validator.md#aggregation-selection # is_aggregator uses `len(committee) div TARGET_AGGREGATORS_PER_COMMITTEE` # to determine whether committee length/slot signature pairs aggregate the # attestations in a slot/committee, where TARGET_AGGREGATORS_PER_COMMITTEE # is currently 16 in all defined presets. Therefore, probe a committee len # to determine whether it's possible that it's within a boundary such that # either that length or other possible committee lengths don't cross those # div/mod 16 boundaries which would change is_aggregator results. static: doAssert TARGET_AGGREGATORS_PER_COMMITTEE == 16 # mainnet, minimal let probeCommitteeLen = get_beacon_committee_len( node.chainDag.headState.data.data, compute_start_slot_at_epoch(epoch), 0.CommitteeIndex, cache) # Without knowing whether probeCommitteeLen is the higher or lower, if it's # [-1, 1] mod TARGET_AGGREGATORS_PER_COMMITTEE it might cross boundaries in # is_aggregator, such that one can't hoist committee length calculation out # of the anyIt(...) loop. isConstAggregationLen = (probeCommitteeLen mod TARGET_AGGREGATORS_PER_COMMITTEE) notin [0'u64, 1'u64, TARGET_AGGREGATORS_PER_COMMITTEE - 1] template isAnyCommitteeValidatorAggregating( validatorIndices, committeeLen: untyped, slot: Slot): bool = anyIt( validatorIndices, is_aggregator( committeeLen, await attachedValidators[it.ValidatorIndex].getSlotSig( node.chainDag.headState.data.data.fork, node.chainDag.headState.data.data.genesis_validators_root, slot))) # The relevant bitmap are 32 bits each. static: doAssert SLOTS_PER_EPOCH <= 32 node.attestationSubnets.lastCalculatedAttestationEpoch = epoch node.attestationSubnets.attestingSlots[epoch mod 2] = 0 for (validatorIndices, committeeIndex, subnetIndex, slot) in get_committee_assignments( node.chainDag.headState.data.data, epoch, validatorIndices, cache): doAssert compute_epoch_at_slot(slot) == epoch let committeeLen = if isConstAggregationLen: probeCommitteeLen else: get_beacon_committee_len( node.chainDag.headState.data.data, slot, committeeIndex, cache) # Each get_committee_assignments() call here is on the next epoch. At any # given time, only care about two epochs, the current and next epoch. So, # after it is done for an epoch, [aS[epoch mod 2], aS[1 - (epoch mod 2)]] # provides, sequentially, the current and next epochs' slot schedules. If # get_committee_assignments() has not been called for the next epoch yet, # typically because there hasn't been a block in the current epoch, there # isn't valid information in aS[1 - (epoch mod 2)], and only slots within # the current epoch can be known. Usually, this is not a major issue, but # when there hasn't been a block substantially through an epoch, it might # prove misleading to claim that there aren't attestations known, when it # only might be known either way for 3 more slots. However, it's also not # as important to attest when blocks aren't flowing as only attestions in # blocks garner rewards. node.attestationSubnets.attestingSlots[epoch mod 2] = node.attestationSubnets.attestingSlots[epoch mod 2] or (1'u32 shl (slot mod SLOTS_PER_EPOCH)) if not isAnyCommitteeValidatorAggregating( validatorIndices, committeeLen, slot): continue node.attestationSubnets.unsubscribeSlot[subnetIndex] = max(slot + 1, node.attestationSubnets.unsubscribeSlot[subnetIndex]) if subnetIndex notin node.attestationSubnets.subscribedSubnets: const SUBNET_SUBSCRIPTION_LEAD_TIME_SLOTS = 34 node.attestationSubnets.subscribeSlot[subnetIndex] = # Queue upcoming subscription potentially earlier # SLOTS_PER_EPOCH emulates one boundary condition of the per-epoch # cycling mechanism timing buffers min( slot - min(slot.uint64, SUBNET_SUBSCRIPTION_LEAD_TIME_SLOTS), node.attestationSubnets.subscribeSlot[subnetIndex]) # https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/validator.md#phase-0-attestation-subnet-stability proc getStabilitySubnetLength(node: BeaconNode): uint64 = EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION + node.network.rng[].rand(EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION.int).uint64 proc updateStabilitySubnets(node: BeaconNode, slot: Slot): set[uint8] = # Equivalent to wallSlot by cycleAttestationSubnets(), especially # since it'll try to run early in epochs, avoiding race conditions. static: doAssert ATTESTATION_SUBNET_COUNT <= high(uint8) let epoch = slot.epoch # https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/validator.md#phase-0-attestation-subnet-stability for i in 0 ..< node.attestationSubnets.stabilitySubnets.len: if epoch >= node.attestationSubnets.stabilitySubnets[i].expiration: node.attestationSubnets.stabilitySubnets[i].subnet = node.network.rng[].rand(ATTESTATION_SUBNET_COUNT - 1).uint8 node.attestationSubnets.stabilitySubnets[i].expiration = epoch + node.getStabilitySubnetLength() result.incl node.attestationSubnets.stabilitySubnets[i].subnet proc cycleAttestationSubnetsPerEpoch( node: BeaconNode, wallSlot: Slot, prevStabilitySubnets: set[uint8]): Future[set[uint8]] {.async.} = # Per-epoch portion of subnet cycling: updating stability subnets and # calculating future attestation subnets. # Only know RANDAO mix, which determines shuffling seed, one epoch in # advance. When node.chainDag.headState.data.data.slot.epoch is ahead # of wallSlot, the clock's just incorrect. If the state slot's behind # wallSlot, it would have to look more than MIN_SEED_LOOKAHEAD epochs # ahead to compute the shuffling determining the beacon committees. static: doAssert MIN_SEED_LOOKAHEAD == 1 if node.chainDag.headState.data.data.slot.epoch != wallSlot.epoch: debug "Requested attestation subnets too far in advance", wallSlot, stateSlot = node.chainDag.headState.data.data.slot return prevStabilitySubnets # This works so long as at least one block in an epoch provides a basis for # calculating the shuffling for the next epoch. It will keep checking for a # block, each slot, until a block comes in, even if the first few blocks in # an epoch are missing. If a whole epoch without blocks occurs, it's not as # important to attest regardless, as those upcoming blocks will hit maximum # attestations quickly and any individual attestation's likelihood of being # selected is low. if node.attestationSubnets.nextCycleEpoch <= wallSlot.epoch: await node.updateSubscriptionSchedule(wallSlot.epoch + 1) node.attestationSubnets.nextCycleEpoch = wallSlot.epoch + 1 let stabilitySubnets = node.updateStabilitySubnets(wallSlot) if not node.config.subscribeAllSubnets and stabilitySubnets != prevStabilitySubnets: # In subscribeAllSubnets mode, this only gets set once, at initial subnet # attestation handler creation, since they're all considered as stability # subnets in that case. node.updateStabilitySubnetMetadata(stabilitySubnets) return stabilitySubnets proc cycleAttestationSubnets(node: BeaconNode, wallSlot: Slot) {.async.} = static: doAssert RANDOM_SUBNETS_PER_VALIDATOR == 1 doAssert not node.config.subscribeAllSubnets let prevSubscribedSubnets = node.attestationSubnets.subscribedSubnets for i in 0'u8 ..< ATTESTATION_SUBNET_COUNT: if i in node.attestationSubnets.subscribedSubnets: if wallSlot >= node.attestationSubnets.unsubscribeSlot[i]: node.attestationSubnets.subscribedSubnets.excl i else: if wallSlot >= node.attestationSubnets.subscribeSlot[i]: node.attestationSubnets.subscribedSubnets.incl i let prevStabilitySubnets = getStabilitySubnets(node.attestationSubnets.stabilitySubnets) stabilitySubnets = await node.cycleAttestationSubnetsPerEpoch(wallSlot, prevStabilitySubnets) # Accounting specific to non-stability subnets for expiringSubnet in prevSubscribedSubnets - node.attestationSubnets.subscribedSubnets: node.attestationSubnets.subscribeSlot[expiringSubnet] = FAR_FUTURE_SLOT let prevAllSubnets = prevSubscribedSubnets + prevStabilitySubnets allSubnets = node.attestationSubnets.subscribedSubnets + stabilitySubnets unsubscribedSubnets = prevAllSubnets - allSubnets subscribedSubnets = allSubnets - prevAllSubnets for subnet in unsubscribedSubnets: node.network.unsubscribe( getAttestationTopic(node.forkDigest, subnet)) node.installAttestationSubnetHandlers(subscribedSubnets) debug "Attestation subnets", expiringSubnets = prevSubscribedSubnets - node.attestationSubnets.subscribedSubnets, subnets = node.attestationSubnets.subscribedSubnets, newSubnets = node.attestationSubnets.subscribedSubnets - prevSubscribedSubnets, wallSlot, wallEpoch = wallSlot.epoch, num_stability_subnets = node.attestationSubnets.stabilitySubnets.len, expiring_stability_subnets = prevStabilitySubnets - stabilitySubnets, new_stability_subnets = stabilitySubnets - prevStabilitySubnets, subscribedSubnets, unsubscribedSubnets proc getInitialAttestationSubnets(node: BeaconNode): Table[uint8, Slot] = let wallEpoch = node.beaconClock.now().slotOrZero().epoch validatorIndices = toIntSet(toSeq(node.getAttachedValidators().keys())) var cache = StateCache() template mergeAttestationSubnets(epoch: Epoch) = # TODO when https://github.com/nim-lang/Nim/issues/15972 and # https://github.com/nim-lang/Nim/issues/16217 are fixed, in # Nimbus's Nim, use (_, _, subnetIndex, slot). for (_, ci, subnetIndex, slot) in get_committee_assignments( node.chainDag.headState.data.data, epoch, validatorIndices, cache): if subnetIndex in result: result[subnetIndex] = max(result[subnetIndex], slot + 1) else: result[subnetIndex] = slot + 1 # Either wallEpoch is 0, in which case it might be pre-genesis, but we only # care about the already-known first two epochs of attestations, or it's in # epoch 0 for real, in which case both are also already known; or wallEpoch # is greater than 0, in which case it's being called from onSlotStart which # has enough state to calculate wallEpoch + {0,1}'s attestations. mergeAttestationSubnets(wallEpoch) mergeAttestationSubnets(wallEpoch + 1) proc getAttestationSubnetHandlers(node: BeaconNode) = # https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/validator.md#phase-0-attestation-subnet-stability # TODO: # We might want to reuse the previous stability subnet if not expired when: # - Restarting the node with a presistent netkey # - When going from synced -> syncing -> synced state template getAllAttestationSubnets(): Table[uint8, Slot] = var subnets: Table[uint8, Slot] for i in 0'u8 ..< ATTESTATION_SUBNET_COUNT: subnets[i] = FAR_FUTURE_SLOT subnets let initialSubnets = if node.config.subscribeAllSubnets: getAllAttestationSubnets() else: node.getInitialAttestationSubnets() wallEpoch = node.beaconClock.now().slotOrZero().epoch var initialStabilitySubnets: set[uint8] node.attestationSubnets.stabilitySubnets.setLen( node.attachedValidators[].count) for i in 0 ..< node.attachedValidators[].count: node.attestationSubnets.stabilitySubnets[i] = ( subnet: node.network.rng[].rand(ATTESTATION_SUBNET_COUNT - 1).uint8, expiration: wallEpoch + node.getStabilitySubnetLength()) initialStabilitySubnets.incl( node.attestationSubnets.stabilitySubnets[i].subnet) node.updateStabilitySubnetMetadata( if node.config.subscribeAllSubnets: {0'u8 .. (ATTESTATION_SUBNET_COUNT - 1)} else: node.attestationSubnets.stabilitySubnets.getStabilitySubnets) for i in 0'u8 ..< ATTESTATION_SUBNET_COUNT: if i in initialSubnets: node.attestationSubnets.subscribedSubnets.incl i node.attestationSubnets.unsubscribeSlot[i] = initialSubnets[i] else: node.attestationSubnets.subscribedSubnets.excl i node.attestationSubnets.subscribeSlot[i] = FAR_FUTURE_SLOT node.attestationSubnets.enabled = true debug "Initial attestation subnets subscribed", initialSubnets, initialStabilitySubnets, wallEpoch node.installAttestationSubnetHandlers( node.attestationSubnets.subscribedSubnets + initialStabilitySubnets) proc addMessageHandlers(node: BeaconNode) = # inspired by lighthouse research here # https://gist.github.com/blacktemplar/5c1862cb3f0e32a1a7fb0b25e79e6e2c#file-generate-scoring-params-py const blocksTopicParams = TopicParams( topicWeight: 0.5, timeInMeshWeight: 0.03333333333333333, timeInMeshQuantum: chronos.seconds(12), timeInMeshCap: 300, firstMessageDeliveriesWeight: 1.1471603557060206, firstMessageDeliveriesDecay: 0.9928302477768374, firstMessageDeliveriesCap: 34.86870846001471, meshMessageDeliveriesWeight: -458.31054878249114, meshMessageDeliveriesDecay: 0.9716279515771061, meshMessageDeliveriesThreshold: 0.6849191409056553, meshMessageDeliveriesCap: 2.054757422716966, meshMessageDeliveriesActivation: chronos.seconds(384), meshMessageDeliveriesWindow: chronos.seconds(2), meshFailurePenaltyWeight: -458.31054878249114 , meshFailurePenaltyDecay: 0.9716279515771061, invalidMessageDeliveriesWeight: -214.99999999999994, invalidMessageDeliveriesDecay: 0.9971259067705325 ) aggregateTopicParams = TopicParams( topicWeight: 0.5, timeInMeshWeight: 0.03333333333333333, timeInMeshQuantum: chronos.seconds(12), timeInMeshCap: 300, firstMessageDeliveriesWeight: 0.10764904539552399, firstMessageDeliveriesDecay: 0.8659643233600653, firstMessageDeliveriesCap: 371.5778421725158, meshMessageDeliveriesWeight: -0.07538533073670682, meshMessageDeliveriesDecay: 0.930572040929699, meshMessageDeliveriesThreshold: 53.404248450179836, meshMessageDeliveriesCap: 213.61699380071934, meshMessageDeliveriesActivation: chronos.seconds(384), meshMessageDeliveriesWindow: chronos.seconds(2), meshFailurePenaltyWeight: -0.07538533073670682 , meshFailurePenaltyDecay: 0.930572040929699, invalidMessageDeliveriesWeight: -214.99999999999994, invalidMessageDeliveriesDecay: 0.9971259067705325 ) basicParams = TopicParams.init() static: # compile time validation blocksTopicParams.validateParameters().tryGet() aggregateTopicParams.validateParameters().tryGet() basicParams.validateParameters.tryGet() node.network.subscribe(node.topicBeaconBlocks, blocksTopicParams, enableTopicMetrics = true) node.network.subscribe(getAttesterSlashingsTopic(node.forkDigest), basicParams) node.network.subscribe(getProposerSlashingsTopic(node.forkDigest), basicParams) node.network.subscribe(getVoluntaryExitsTopic(node.forkDigest), basicParams) node.network.subscribe(getAggregateAndProofsTopic(node.forkDigest), aggregateTopicParams, enableTopicMetrics = true) node.getAttestationSubnetHandlers() func getTopicSubscriptionEnabled(node: BeaconNode): bool = node.attestationSubnets.enabled proc removeMessageHandlers(node: BeaconNode) = node.attestationSubnets.enabled = false doAssert not node.getTopicSubscriptionEnabled() node.network.unsubscribe(getBeaconBlocksTopic(node.forkDigest)) node.network.unsubscribe(getVoluntaryExitsTopic(node.forkDigest)) node.network.unsubscribe(getProposerSlashingsTopic(node.forkDigest)) node.network.unsubscribe(getAttesterSlashingsTopic(node.forkDigest)) node.network.unsubscribe(getAggregateAndProofsTopic(node.forkDigest)) for subnet in 0'u64 ..< ATTESTATION_SUBNET_COUNT: node.network.unsubscribe(getAttestationTopic(node.forkDigest, subnet)) proc setupDoppelgangerDetection(node: BeaconNode, slot: Slot) = # When another client's already running, this is very likely to detect # potential duplicate validators, which can trigger slashing. # # Every missed attestation costs approximately 3*get_base_reward(), which # can be up to around 10,000 Wei. Thus, skipping attestations isn't cheap # and one should gauge the likelihood of this simultaneous launch to tune # the epoch delay to one's perceived risk. const duplicateValidatorEpochs = 2 node.processor.doppelgangerDetection.broadcastStartEpoch = slot.epoch + duplicateValidatorEpochs debug "Setting up doppelganger protection", epoch = slot.epoch, broadcastStartEpoch = node.processor.doppelgangerDetection.broadcastStartEpoch proc updateGossipStatus(node: BeaconNode, slot: Slot) = # Syncing tends to be ~1 block/s, and allow for an epoch of time for libp2p # subscribing to spin up. The faster the sync, the more wallSlot - headSlot # lead time is required const TOPIC_SUBSCRIBE_THRESHOLD_SLOTS = 64 HYSTERESIS_BUFFER = 16 let syncQueueLen = node.syncManager.syncQueueLen topicSubscriptionEnabled = node.getTopicSubscriptionEnabled() if # Don't enable if already enabled; to avoid race conditions requires care, # but isn't crucial, as this condition spuriously fail, but the next time, # should properly succeed. not topicSubscriptionEnabled and # SyncManager forward sync by default runs until maxHeadAge slots, or one # epoch range is achieved. This particular condition has a couple caveats # including that under certain conditions, debtsCount appears to push len # (here, syncQueueLen) to underflow-like values; and even when exactly at # the expected walltime slot the queue isn't necessarily empty. Therefore # TOPIC_SUBSCRIBE_THRESHOLD_SLOTS is not exactly the number of slots that # are left. Furthermore, even when 0 peers are being used, this won't get # to 0 slots in syncQueueLen, but that's a vacuous condition given that a # networking interaction cannot happen under such circumstances. syncQueueLen < TOPIC_SUBSCRIBE_THRESHOLD_SLOTS: # When node.cycleAttestationSubnets() is enabled more properly, integrate # this into the node.cycleAttestationSubnets() call. debug "Enabling topic subscriptions", wallSlot = slot, headSlot = node.chainDag.head.slot, syncQueueLen node.setupDoppelgangerDetection(slot) node.addMessageHandlers() doAssert node.getTopicSubscriptionEnabled() elif topicSubscriptionEnabled and syncQueueLen > TOPIC_SUBSCRIBE_THRESHOLD_SLOTS + HYSTERESIS_BUFFER and # Filter out underflow from debtsCount; plausible queue lengths can't # exceed wallslot, with safety margin. syncQueueLen < 2 * slot.uint64: debug "Disabling topic subscriptions", wallSlot = slot, headSlot = node.chainDag.head.slot, syncQueueLen node.removeMessageHandlers() # Subscription or unsubscription might have occurred; recheck. Since Nimbus # initially subscribes to all subnets, simply do not ever cycle attestation # subnets and they'll all remain subscribed. if node.getTopicSubscriptionEnabled and not node.config.subscribeAllSubnets: # This exits early all but one call each epoch. traceAsyncErrors node.cycleAttestationSubnets(slot) func getNextAttestation(node: BeaconNode, slot: Slot): Slot = # The relevant attestations are in, depending on calculated bounds: # [aS[epoch mod 2], aS[1 - (epoch mod 2)]] # current epoch next epoch let orderedAttestingSlots = [ node.attestationSubnets.attestingSlots[ slot.epoch mod 2'u64], node.attestationSubnets.attestingSlots[1 - (slot.epoch mod 2'u64)]] static: doAssert MIN_ATTESTATION_INCLUSION_DELAY == 1 # Cleverer ways exist, but a short loop is fine. O(n) vs O(log n) isn't that # important when n is 32 or 64, with early exit on average no more than half # through. for i in [0'u64, 1'u64]: let bitmapEpoch = slot.epoch + i if bitmapEpoch > node.attestationSubnets.lastCalculatedAttestationEpoch: return FAR_FUTURE_SLOT for slotOffset in 0 ..< SLOTS_PER_EPOCH: let nextAttestationSlot = compute_start_slot_at_epoch(bitmapEpoch) + slotOffset if ((orderedAttestingSlots[i] and (1'u32 shl slotOffset)) != 0) and nextAttestationSlot > slot: return nextAttestationSlot FAR_FUTURE_SLOT proc onSlotEnd(node: BeaconNode, slot: Slot) {.async.} = # Things we do when slot processing has ended and we're about to wait for the # next slot # Delay part of pruning until latency critical duties are done. # The other part of pruning, `pruneBlocksDAG`, is done eagerly. node.consensusManager[].pruneStateCachesAndForkChoice() when declared(GC_fullCollect): # The slots in the beacon node work as frames in a game: we want to make # sure that we're ready for the next one and don't get stuck in lengthy # garbage collection tasks when time is of essence in the middle of a slot - # while this does not guarantee that we'll never collect during a slot, it # makes sure that all the scratch space we used during slot tasks (logging, # temporary buffers etc) gets recycled for the next slot that is likely to # need similar amounts of memory. GC_fullCollect() # Checkpoint the database to clear the WAL file and make sure changes in # the database are synced with the filesystem. node.db.checkpoint() let nextAttestationSlot = node.getNextAttestation(slot) nextActionWaitTime = saturate(fromNow(node.beaconClock, nextAttestationSlot)) info "Slot end", slot = shortLog(slot), nextSlot = shortLog(slot + 1), head = shortLog(node.chainDag.head), headEpoch = shortLog(node.chainDag.head.slot.compute_epoch_at_slot()), finalizedHead = shortLog(node.chainDag.finalizedHead.blck), finalizedEpoch = shortLog(node.chainDag.finalizedHead.blck.slot.compute_epoch_at_slot()), nextAttestationSlot, nextActionWait = if nextAttestationSlot == FAR_FUTURE_SLOT: "n/a" else: shortLog(nextActionWaitTime) if nextAttestationSlot != FAR_FUTURE_SLOT: next_action_wait.set(nextActionWaitTime.toFloatSeconds) node.updateGossipStatus(slot) proc onSlotStart( node: BeaconNode, wallTime: BeaconTime, lastSlot: Slot) {.async.} = ## Called at the beginning of a slot - usually every slot, but sometimes might ## skip a few in case we're running late. ## wallTime: current system time - we will strive to perform all duties up ## to this point in time ## lastSlot: the last slot that we successfully processed, so we know where to ## start work from - there might be jumps if processing is delayed let # The slot we should be at, according to the clock wallSlot = wallTime.slotOrZero # If everything was working perfectly, the slot that we should be processing expectedSlot = lastSlot + 1 finalizedEpoch = node.chainDag.finalizedHead.blck.slot.compute_epoch_at_slot() delay = wallTime - expectedSlot.toBeaconTime() info "Slot start", lastSlot = shortLog(lastSlot), wallSlot = shortLog(wallSlot), delay = shortLog(delay), peers = len(node.network.peerPool), head = shortLog(node.chainDag.head), headEpoch = shortLog(node.chainDag.head.slot.compute_epoch_at_slot()), finalized = shortLog(node.chainDag.finalizedHead.blck), finalizedEpoch = shortLog(finalizedEpoch), sync = if node.syncManager.inProgress: node.syncManager.syncStatus else: "synced" # Check before any re-scheduling of onSlotStart() checkIfShouldStopAtEpoch(wallSlot, node.config.stopAtEpoch) beacon_slot.set wallSlot.toGaugeValue beacon_current_epoch.set wallSlot.epoch.toGaugeValue # both non-negative, so difference can't overflow or underflow int64 finalization_delay.set( wallSlot.epoch.toGaugeValue - finalizedEpoch.toGaugeValue) if node.config.verifyFinalization: verifyFinalization(node, wallSlot) node.consensusManager[].updateHead(wallSlot) await node.handleValidatorDuties(lastSlot, wallSlot) await onSlotEnd(node, wallSlot) proc runSlotLoop(node: BeaconNode, startTime: BeaconTime) {.async.} = var curSlot = startTime.slotOrZero() nextSlot = curSlot + 1 # No earlier than GENESIS_SLOT + 1 timeToNextSlot = nextSlot.toBeaconTime() - startTime info "Scheduling first slot action", startTime = shortLog(startTime), nextSlot = shortLog(nextSlot), timeToNextSlot = shortLog(timeToNextSlot) while true: # Start by waiting for the time when the slot starts. Sleeping relinquishes # control to other tasks which may or may not finish within the alotted # time, so below, we need to be wary that the ship might have sailed # already. await sleepAsync(timeToNextSlot) let wallTime = node.beaconClock.now() wallSlot = wallTime.slotOrZero() # Always > GENESIS! if wallSlot < nextSlot: # While we were sleeping, the system clock changed and time moved # backwards! if wallSlot + 1 < nextSlot: # This is a critical condition where it's hard to reason about what # to do next - we'll call the attention of the user here by shutting # down. fatal "System time adjusted backwards significantly - clock may be inaccurate - shutting down", nextSlot = shortLog(nextSlot), wallSlot = shortLog(wallSlot) bnStatus = BeaconNodeStatus.Stopping return # Time moved back by a single slot - this could be a minor adjustment, # for example when NTP does its thing after not working for a while warn "System time adjusted backwards, rescheduling slot actions", wallTime = shortLog(wallTime), nextSlot = shortLog(nextSlot), wallSlot = shortLog(wallSlot) # cur & next slot remain the same timeToNextSlot = nextSlot.toBeaconTime() - wallTime continue if wallSlot > nextSlot + SLOTS_PER_EPOCH: # Time moved forwards by more than an epoch - either the clock was reset # or we've been stuck in processing for a long time - either way, we will # skip ahead so that we only process the events of the last # SLOTS_PER_EPOCH slots warn "Time moved forwards by more than an epoch, skipping ahead", curSlot = shortLog(curSlot), nextSlot = shortLog(nextSlot), wallSlot = shortLog(wallSlot) curSlot = wallSlot - SLOTS_PER_EPOCH elif wallSlot > nextSlot: notice "Missed expected slot start, catching up", delay = shortLog(wallTime - nextSlot.toBeaconTime()), curSlot = shortLog(curSlot), nextSlot = shortLog(curSlot) await onSlotStart(node, wallTime, curSlot) curSlot = wallSlot nextSlot = wallSlot + 1 timeToNextSlot = saturate(node.beaconClock.fromNow(nextSlot)) proc handleMissingBlocks(node: BeaconNode) = let missingBlocks = node.quarantine.checkMissing() if missingBlocks.len > 0: debug "Requesting detected missing blocks", blocks = shortLog(missingBlocks) node.requestManager.fetchAncestorBlocks(missingBlocks) proc onSecond(node: BeaconNode) = ## This procedure will be called once per second. if not(node.syncManager.inProgress): node.handleMissingBlocks() proc runOnSecondLoop(node: BeaconNode) {.async.} = let sleepTime = chronos.seconds(1) const nanosecondsIn1s = float(chronos.seconds(1).nanoseconds) while true: let start = chronos.now(chronos.Moment) await chronos.sleepAsync(sleepTime) let afterSleep = chronos.now(chronos.Moment) let sleepTime = afterSleep - start node.onSecond() let finished = chronos.now(chronos.Moment) let processingTime = finished - afterSleep ticks_delay.set(sleepTime.nanoseconds.float / nanosecondsIn1s) trace "onSecond task completed", sleepTime, processingTime proc startSyncManager(node: BeaconNode) = func getLocalHeadSlot(): Slot = node.chainDag.head.slot proc getLocalWallSlot(): Slot = node.beaconClock.now().slotOrZero func getFirstSlotAtFinalizedEpoch(): Slot = node.chainDag.finalizedHead.slot proc scoreCheck(peer: Peer): bool = if peer.score < PeerScoreLowLimit: false else: true proc onDeletePeer(peer: Peer) = if peer.connectionState notin {Disconnecting, Disconnected}: if peer.score < PeerScoreLowLimit: debug "Peer was removed from PeerPool due to low score", peer = peer, peer_score = peer.score, score_low_limit = PeerScoreLowLimit, score_high_limit = PeerScoreHighLimit asyncSpawn peer.disconnect(PeerScoreLow) else: debug "Peer was removed from PeerPool", peer = peer, peer_score = peer.score, score_low_limit = PeerScoreLowLimit, score_high_limit = PeerScoreHighLimit asyncSpawn peer.disconnect(FaultOrError) node.network.peerPool.setScoreCheck(scoreCheck) node.network.peerPool.setOnDeletePeer(onDeletePeer) node.syncManager = newSyncManager[Peer, PeerID]( node.network.peerPool, getLocalHeadSlot, getLocalWallSlot, getFirstSlotAtFinalizedEpoch, node.verifQueues, chunkSize = 32 ) node.syncManager.start() proc connectedPeersCount(node: BeaconNode): int = len(node.network.peerPool) proc installRpcHandlers(rpcServer: RpcServer, node: BeaconNode) = rpcServer.installBeaconApiHandlers(node) rpcServer.installConfigApiHandlers(node) rpcServer.installDebugApiHandlers(node) rpcServer.installEventApiHandlers(node) rpcServer.installNimbusApiHandlers(node) rpcServer.installNodeApiHandlers(node) rpcServer.installValidatorApiHandlers(node) proc installMessageValidators(node: BeaconNode) = # https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/p2p-interface.md#attestations-and-aggregation # These validators stay around the whole time, regardless of which specific # subnets are subscribed to during any given epoch. for it in 0'u64 ..< ATTESTATION_SUBNET_COUNT.uint64: closureScope: let ci = it node.network.addValidator( getAttestationTopic(node.forkDigest, ci), # This proc needs to be within closureScope; don't lift out of loop. proc(attestation: Attestation): ValidationResult = node.processor[].attestationValidator(attestation, ci)) node.network.addValidator( getAggregateAndProofsTopic(node.forkDigest), proc(signedAggregateAndProof: SignedAggregateAndProof): ValidationResult = node.processor[].aggregateValidator(signedAggregateAndProof)) node.network.addValidator( node.topicBeaconBlocks, proc (signedBlock: SignedBeaconBlock): ValidationResult = node.processor[].blockValidator(signedBlock)) node.network.addValidator( getAttesterSlashingsTopic(node.forkDigest), proc (attesterSlashing: AttesterSlashing): ValidationResult = node.processor[].attesterSlashingValidator(attesterSlashing)) node.network.addValidator( getProposerSlashingsTopic(node.forkDigest), proc (proposerSlashing: ProposerSlashing): ValidationResult = node.processor[].proposerSlashingValidator(proposerSlashing)) node.network.addValidator( getVoluntaryExitsTopic(node.forkDigest), proc (signedVoluntaryExit: SignedVoluntaryExit): ValidationResult = node.processor[].voluntaryExitValidator(signedVoluntaryExit)) proc stop*(node: BeaconNode) = bnStatus = BeaconNodeStatus.Stopping notice "Graceful shutdown" if not node.config.inProcessValidators: node.vcProcess.close() waitFor node.network.stop() node.attachedValidators.slashingProtection.close() node.db.close() notice "Databases closed" proc run*(node: BeaconNode) = if bnStatus == BeaconNodeStatus.Starting: # it might have been set to "Stopping" with Ctrl+C bnStatus = BeaconNodeStatus.Running if node.rpcServer != nil: node.rpcServer.installRpcHandlers(node) node.rpcServer.start() node.installMessageValidators() let startTime = node.beaconClock.now() asyncSpawn runSlotLoop(node, startTime) asyncSpawn runOnSecondLoop(node) asyncSpawn runQueueProcessingLoop(node.verifQueues) node.requestManager.start() node.startSyncManager() if not startTime.toSlot().afterGenesis: node.setupDoppelgangerDetection(startTime.slotOrZero()) node.addMessageHandlers() doAssert node.getTopicSubscriptionEnabled() ## Ctrl+C handling proc controlCHandler() {.noconv.} = when defined(windows): # workaround for https://github.com/nim-lang/Nim/issues/4057 setupForeignThreadGc() notice "Shutting down after having received SIGINT" bnStatus = BeaconNodeStatus.Stopping setControlCHook(controlCHandler) # equivalent SIGTERM handler when defined(posix): proc SIGTERMHandler(signal: cint) {.noconv.} = notice "Shutting down after having received SIGTERM" bnStatus = BeaconNodeStatus.Stopping c_signal(SIGTERM, SIGTERMHandler) # main event loop while bnStatus == BeaconNodeStatus.Running: try: poll() except CatchableError as e: debug "Exception in poll()", exc = e.name, err = e.msg # time to say goodbye node.stop() var gPidFile: string proc createPidFile(filename: string) = writeFile filename, $os.getCurrentProcessId() gPidFile = filename addQuitProc proc {.noconv.} = discard io2.removeFile(gPidFile) proc initializeNetworking(node: BeaconNode) {.async.} = info "Listening to incoming network requests" await node.network.startListening() let addressFile = node.config.dataDir / "beacon_node.enr" writeFile(addressFile, node.network.announcedENR.toURI) await node.network.start() func shouldWeStartWeb3(node: BeaconNode): bool = (node.config.web3Mode == Web3Mode.enabled) or (node.config.web3Mode == Web3Mode.auto and node.attachedValidators[].count > 0) proc start(node: BeaconNode) = let head = node.chainDag.head finalizedHead = node.chainDag.finalizedHead genesisTime = node.beaconClock.fromNow(toBeaconTime(Slot 0)) notice "Starting beacon node", version = fullVersionStr, enr = node.network.announcedENR.toURI, peerId = $node.network.switch.peerInfo.peerId, timeSinceFinalization = node.beaconClock.now() - finalizedHead.slot.toBeaconTime(), head = shortLog(head), finalizedHead = shortLog(finalizedHead), SLOTS_PER_EPOCH, SECONDS_PER_SLOT, SPEC_VERSION, dataDir = node.config.dataDir.string, validators = node.attachedValidators[].count if genesisTime.inFuture: notice "Waiting for genesis", genesisIn = genesisTime.offset waitFor node.initializeNetworking() # TODO this does not account for validators getting attached "later" if node.eth1Monitor != nil and node.shouldWeStartWeb3: node.eth1Monitor.start() node.run() func formatGwei(amount: uint64): string = # TODO This is implemented in a quite a silly way. # Better routines for formatting decimal numbers # should exists somewhere else. let eth = amount div 1000000000 remainder = amount mod 1000000000 result = $eth if remainder != 0: result.add '.' let remainderStr = $remainder for i in remainderStr.len ..< 9: result.add '0' result.add remainderStr while result[^1] == '0': result.setLen(result.len - 1) proc initStatusBar(node: BeaconNode) = if not isatty(stdout): return if not node.config.statusBarEnabled: return enableTrueColors() proc dataResolver(expr: string): string = template justified: untyped = node.chainDag.head.atEpochStart( node.chainDag.headState.data.data.current_justified_checkpoint.epoch) # TODO: # We should introduce a general API for resolving dot expressions # such as `db.latest_block.slot` or `metrics.connected_peers`. # Such an API can be shared between the RPC back-end, CLI tools # such as ncli, a potential GraphQL back-end and so on. # The status bar feature would allow the user to specify an # arbitrary expression that is resolvable through this API. case expr.toLowerAscii of "connected_peers": $(node.connectedPeersCount) of "head_root": shortLog(node.chainDag.head.root) of "head_epoch": $(node.chainDag.head.slot.epoch) of "head_epoch_slot": $(node.chainDag.head.slot mod SLOTS_PER_EPOCH) of "head_slot": $(node.chainDag.head.slot) of "justifed_root": shortLog(justified.blck.root) of "justifed_epoch": $(justified.slot.epoch) of "justifed_epoch_slot": $(justified.slot mod SLOTS_PER_EPOCH) of "justifed_slot": $(justified.slot) of "finalized_root": shortLog(node.chainDag.finalizedHead.blck.root) of "finalized_epoch": $(node.chainDag.finalizedHead.slot.epoch) of "finalized_epoch_slot": $(node.chainDag.finalizedHead.slot mod SLOTS_PER_EPOCH) of "finalized_slot": $(node.chainDag.finalizedHead.slot) of "epoch": $node.currentSlot.epoch of "epoch_slot": $(node.currentSlot mod SLOTS_PER_EPOCH) of "slot": $node.currentSlot of "slots_per_epoch": $SLOTS_PER_EPOCH of "slot_trailing_digits": var slotStr = $node.currentSlot if slotStr.len > 3: slotStr = slotStr[^3..^1] slotStr of "attached_validators_balance": formatGwei(node.attachedValidatorBalanceTotal) of "sync_status": if isNil(node.syncManager): "pending" else: if node.syncManager.inProgress: node.syncManager.syncStatus else: "synced" else: # We ignore typos for now and just render the expression # as it was written. TODO: come up with a good way to show # an error message to the user. "$" & expr var statusBar = StatusBarView.init( node.config.statusBarContents, dataResolver) when compiles(defaultChroniclesStream.output.writer): defaultChroniclesStream.output.writer = proc (logLevel: LogLevel, msg: LogOutputStr) {.raises: [Defect].} = try: # p.hidePrompt erase statusBar # p.writeLine msg stdout.write msg render statusBar # p.showPrompt except Exception as e: # render raises Exception logLoggingFailure(cstring(msg), e) proc statusBarUpdatesPollingLoop() {.async.} = try: while true: update statusBar erase statusBar render statusBar await sleepAsync(chronos.seconds(1)) except CatchableError as exc: warn "Failed to update status bar, no further updates", err = exc.msg asyncSpawn statusBarUpdatesPollingLoop() when hasPrompt: # TODO: nim-prompt seems to have threading issues at the moment # which result in sporadic crashes. We should introduce a # lock that guards the access to the internal prompt line # variable. # # var p = Prompt.init("nimbus > ", providePromptCompletions) # p.useHistoryFile() from unicode import Rune import prompt func providePromptCompletions*(line: seq[Rune], cursorPos: int): seq[string] = # TODO # The completions should be generated with the general-purpose command-line # parsing API of Confutils result = @[] proc processPromptCommands(p: ptr Prompt) {.thread.} = while true: var cmd = p[].readLine() case cmd of "quit": quit 0 else: p[].writeLine("Unknown command: " & cmd) proc initPrompt(node: BeaconNode) = # var t: Thread[ptr Prompt] # createThread(t, processPromptCommands, addr p) discard proc handleValidatorExitCommand(config: BeaconNodeConf) {.async.} = let port = try: let value = parseInt(config.rpcUrlForExit.port) if value < Port.low.int or value > Port.high.int: raise newException(ValueError, "The port number must be between " & $Port.low & " and " & $Port.high) Port value except CatchableError as err: fatal "Invalid port number", err = err.msg quit 1 let rpcClient = newRpcHttpClient() try: await connect(rpcClient, config.rpcUrlForExit.hostname, port) except CatchableError as err: fatal "Failed to connect to the beacon node RPC service", err = err.msg quit 1 let (validator, validatorIdx, _, _) = try: await rpcClient.get_v1_beacon_states_stateId_validators_validatorId( "head", config.exitedValidator) except CatchableError as err: fatal "Failed to obtain information for validator", err = err.msg quit 1 let exitAtEpoch = if config.exitAtEpoch.isSome: Epoch config.exitAtEpoch.get else: let headSlot = try: await rpcClient.getBeaconHead() except CatchableError as err: fatal "Failed to obtain the current head slot", err = err.msg quit 1 headSlot.epoch let validatorsDir = config.validatorsDir validatorKeyAsStr = "0x" & $validator.pubkey keystoreDir = validatorsDir / validatorKeyAsStr if not dirExists(keystoreDir): echo "The validator keystores directory '" & config.validatorsDir.string & "' does not contain a keystore for the selected validator with public " & "key '" & validatorKeyAsStr & "'." quit 1 let signingKey = loadKeystore( validatorsDir, config.secretsDir, validatorKeyAsStr, config.nonInteractive) if signingKey.isNone: fatal "Unable to continue without decrypted signing key" quit 1 let fork = try: await rpcClient.get_v1_beacon_states_fork("head") except CatchableError as err: fatal "Failed to obtain the fork id of the head state", err = err.msg quit 1 let genesisValidatorsRoot = try: (await rpcClient.get_v1_beacon_genesis()).genesis_validators_root except CatchableError as err: fatal "Failed to obtain the genesis validators root of the network", err = err.msg quit 1 var signedExit = SignedVoluntaryExit( message: VoluntaryExit( epoch: exitAtEpoch, validator_index: validatorIdx)) signedExit.signature = get_voluntary_exit_signature( fork, genesisValidatorsRoot, signedExit.message, signingKey.get) template ask(prompt: string): string = try: stdout.write prompt, ": " stdin.readLine() except IOError: fatal "Failed to read user input from stdin" quit 1 try: echoP "PLEASE BEWARE!" echoP "Publishing a voluntary exit is an irreversible operation! " & "You won't be able to restart again with the same validator." echoP "By requesting an exit now, you'll be exempt from penalties " & "stemming from not performing your validator duties, but you " & "won't be able to withdraw your deposited funds for the time " & "being. This means that your funds will be effectively frozen " & "until withdrawals are enabled in a future phase of Eth2." echoP "To understand more about the Eth2 roadmap, we recommend you " & "have a look at\n" & "https://ethereum.org/en/eth2/#roadmap" echoP "You must keep your validator running for at least 5 epochs " & "(32 minutes) after requesting a validator exit, as you will " & "still be required to perform validator duties until your exit " & "has been processed. The number of epochs could be significantly " & "higher depending on how many other validators are queued to exit." echoP "As such, we recommend you keep track of your validator's status " & "using an Eth2 block explorer before shutting down your beacon node." const confirmation = "I understand the implications of submitting a voluntary exit" while true: echoP "To proceed to submitting your voluntary exit, please type '" & confirmation & "' (without the quotes) in the prompt below and " & "press ENTER or type 'q' to quit." echo "" let choice = ask "Your choice" if choice == "q": quit 0 elif choice == confirmation: let success = await rpcClient.post_v1_beacon_pool_voluntary_exits(signedExit) if success: echo "Successfully published voluntary exit for validator " & $validatorIdx & "(" & validatorKeyAsStr[0..9] & ")." quit 0 else: echo "The voluntary exit was not submitted successfully. Please try again." quit 1 except CatchableError as err: fatal "Failed to send the signed exit message to the beacon node RPC", err = err.msg quit 1 proc loadEth2Network(config: BeaconNodeConf): Eth2NetworkMetadata = if config.eth2Network.isSome: getMetadataForNetwork(config.eth2Network.get) else: when const_preset == "mainnet": mainnetMetadata else: # Presumably other configurations can have other defaults, but for now # this simplifies the flow echo "Must specify network on non-mainnet node" quit 1 proc loadBeaconNode(config: var BeaconNodeConf, rng: ref BrHmacDrbgContext): BeaconNode = let metadata = config.loadEth2Network() # Updating the config based on the metadata certainly is not beautiful but it # works for node in metadata.bootstrapNodes: config.bootstrapNodes.add node BeaconNode.init( metadata.runtimePreset, rng, config, metadata.depositContractAddress, metadata.depositContractDeployedAt, metadata.eth1Network, metadata.genesisData, metadata.genesisDepositsSnapshot) proc doRunBeaconNode(config: var BeaconNodeConf, rng: ref BrHmacDrbgContext) = info "Launching beacon node", version = fullVersionStr, bls_backend = $BLS_BACKEND, cmdParams = commandLineParams(), config createPidFile(config.dataDir.string / "beacon_node.pid") config.createDumpDirs() if config.metricsEnabled: when useInsecureFeatures: let metricsAddress = config.metricsAddress notice "Starting metrics HTTP server", url = "http://" & $metricsAddress & ":" & $config.metricsPort & "/metrics" metrics.startHttpServer($metricsAddress, config.metricsPort) else: warn "Metrics support disabled, see https://status-im.github.io/nimbus-eth2/metrics-pretty-pictures.html#simple-metrics" # There are no managed event loops in here, to do a graceful shutdown, but # letting the default Ctrl+C handler exit is safe, since we only read from # the db. let node = loadBeaconNode(config, rng) if bnStatus == BeaconNodeStatus.Stopping: return initStatusBar(node) when hasPrompt: initPrompt(node) if node.nickname != "": dynamicLogScope(node = node.nickname): node.start() else: node.start() proc doCreateTestnet(config: BeaconNodeConf, rng: var BrHmacDrbgContext) = let launchPadDeposits = try: Json.loadFile(config.testnetDepositsFile.string, seq[LaunchPadDeposit]) except SerializationError as err: error "Invalid LaunchPad deposits file", err = formatMsg(err, config.testnetDepositsFile.string) quit 1 var deposits: seq[DepositData] for i in config.firstValidator.int ..< launchPadDeposits.len: deposits.add(launchPadDeposits[i] as DepositData) let startTime = uint64(times.toUnix(times.getTime()) + config.genesisOffset) outGenesis = config.outputGenesis.string eth1Hash = if config.web3Url.len == 0: eth1BlockHash else: (waitFor getEth1BlockHash(config.web3Url, blockId("latest"))).asEth2Digest runtimePreset = getRuntimePresetForNetwork(config.eth2Network) var initialState = initialize_beacon_state_from_eth1( runtimePreset, eth1Hash, startTime, deposits, {skipBlsValidation}) # https://github.com/ethereum/eth2.0-pm/tree/6e41fcf383ebeb5125938850d8e9b4e9888389b4/interop/mocked_start#create-genesis-state initialState.genesis_time = startTime doAssert initialState.validators.len > 0 let outGenesisExt = splitFile(outGenesis).ext if cmpIgnoreCase(outGenesisExt, ".json") == 0: Json.saveFile(outGenesis, initialState, pretty = true) echo "Wrote ", outGenesis let outSszGenesis = outGenesis.changeFileExt "ssz" SSZ.saveFile(outSszGenesis, initialState[]) echo "Wrote ", outSszGenesis let bootstrapFile = config.outputBootstrapFile.string if bootstrapFile.len > 0: let networkKeys = getPersistentNetKeys(rng, config) netMetadata = getPersistentNetMetadata(config) bootstrapEnr = enr.Record.init( 1, # sequence number networkKeys.seckey.asEthKey, some(config.bootstrapAddress), some(config.bootstrapPort), some(config.bootstrapPort), [toFieldPair("eth2", SSZ.encode(enrForkIdFromState initialState[])), toFieldPair("attnets", SSZ.encode(netMetadata.attnets))]) writeFile(bootstrapFile, bootstrapEnr.tryGet().toURI) echo "Wrote ", bootstrapFile proc doDeposits(config: BeaconNodeConf, rng: var BrHmacDrbgContext) = case config.depositsCmd #[ of DepositsCmd.create: var seed: KeySeed defer: burnMem(seed) var walletPath: WalletPathPair if config.existingWalletId.isSome: let id = config.existingWalletId.get found = findWalletWithoutErrors(id) if found.isSome: walletPath = found.get else: fatal "Unable to find wallet with the specified name/uuid", id quit 1 var unlocked = unlockWalletInteractively(walletPath.wallet) if unlocked.isOk: swap(seed, unlocked.get) else: # The failure will be reported in `unlockWalletInteractively`. quit 1 else: var walletRes = createWalletInteractively(rng[], config) if walletRes.isErr: fatal "Unable to create wallet", err = walletRes.error quit 1 else: swap(seed, walletRes.get.seed) walletPath = walletRes.get.walletPath let vres = secureCreatePath(config.outValidatorsDir) if vres.isErr(): fatal "Could not create directory", path = config.outValidatorsDir quit QuitFailure let sres = secureCreatePath(config.outSecretsDir) if sres.isErr(): fatal "Could not create directory", path = config.outSecretsDir quit QuitFailure let deposits = generateDeposits( runtimePreset, rng[], seed, walletPath.wallet.nextAccount, config.totalDeposits, config.outValidatorsDir, config.outSecretsDir) if deposits.isErr: fatal "Failed to generate deposits", err = deposits.error quit 1 try: let depositDataPath = if config.outDepositsFile.isSome: config.outDepositsFile.get.string else: config.outValidatorsDir / "deposit_data-" & $epochTime() & ".json" let launchPadDeposits = mapIt(deposits.value, LaunchPadDeposit.init(runtimePreset, it)) Json.saveFile(depositDataPath, launchPadDeposits) echo "Deposit data written to \"", depositDataPath, "\"" walletPath.wallet.nextAccount += deposits.value.len let status = saveWallet(walletPath) if status.isErr: fatal "Failed to update wallet file after generating deposits", wallet = walletPath.path, error = status.error quit 1 except CatchableError as err: fatal "Failed to create launchpad deposit data file", err = err.msg quit 1 of DepositsCmd.status: echo "The status command is not implemented yet" quit 1 #]# of DepositsCmd.`import`: let validatorKeysDir = if config.importedDepositsDir.isSome: config.importedDepositsDir.get else: let cwd = os.getCurrentDir() if dirExists(cwd / "validator_keys"): InputDir(cwd / "validator_keys") else: echo "The default search path for validator keys is a sub-directory " & "named 'validator_keys' in the current working directory. Since " & "no such directory exists, please either provide the correct path" & "as an argument or copy the imported keys in the expected location." quit 1 importKeystoresFromDir( rng, validatorKeysDir.string, config.validatorsDir, config.secretsDir) of DepositsCmd.exit: waitFor handleValidatorExitCommand(config) proc doWallets(config: BeaconNodeConf, rng: var BrHmacDrbgContext) = template findWalletWithoutErrors(name: WalletName): auto = let res = keystore_management.findWallet(config, name) if res.isErr: fatal "Failed to locate wallet", error = res.error quit 1 res.get case config.walletsCmd: of WalletsCmd.create: if config.createdWalletNameFlag.isSome: let name = config.createdWalletNameFlag.get existingWallet = findWalletWithoutErrors(name) if existingWallet.isSome: echo "The Wallet '" & name.string & "' already exists." quit 1 var walletRes = createWalletInteractively(rng, config) if walletRes.isErr: fatal "Unable to create wallet", err = walletRes.error quit 1 burnMem(walletRes.get.seed) of WalletsCmd.list: for kind, walletFile in walkDir(config.walletsDir): if kind != pcFile: continue if checkSensitiveFilePermissions(walletFile): let walletRes = loadWallet(walletFile) if walletRes.isOk: echo walletRes.get.longName else: warn "Found corrupt wallet file", wallet = walletFile, error = walletRes.error else: warn "Found wallet file with insecure permissions", wallet = walletFile of WalletsCmd.restore: restoreWalletInteractively(rng, config) proc doRecord(config: BeaconNodeConf, rng: var BrHmacDrbgContext) = case config.recordCmd: of RecordCmd.create: let netKeys = getPersistentNetKeys(rng, config) var fieldPairs: seq[FieldPair] for field in config.fields: let fieldPair = field.split(":") if fieldPair.len > 1: fieldPairs.add(toFieldPair(fieldPair[0], hexToSeqByte(fieldPair[1]))) else: fatal "Invalid field pair" quit QuitFailure let record = enr.Record.init( config.seqNumber, netKeys.seckey.asEthKey, some(config.ipExt), some(config.tcpPortExt), some(config.udpPortExt), fieldPairs).expect("Record within size limits") echo record.toURI() of RecordCmd.print: echo $config.recordPrint proc doWeb3Cmd(config: BeaconNodeConf) = case config.web3Cmd: of Web3Cmd.test: let metadata = config.loadEth2Network() waitFor testWeb3Provider(config.web3TestUrl, metadata.depositContractAddress) programMain: var config = makeBannerAndConfig(clientId, BeaconNodeConf) setupStdoutLogging(config.logLevel) if not(checkAndCreateDataDir(string(config.dataDir))): # We are unable to access/create data folder or data folder's # permissions are insecure. quit QuitFailure setupLogging(config.logLevel, config.logFile) ## This Ctrl+C handler exits the program in non-graceful way. ## It's responsible for handling Ctrl+C in sub-commands such ## as `wallets *` and `deposits *`. In a regular beacon node ## run, it will be overwritten later with a different handler ## performing a graceful exit. proc exitImmediatelyOnCtrlC() {.noconv.} = when defined(windows): # workaround for https://github.com/nim-lang/Nim/issues/4057 setupForeignThreadGc() echo "" # If we interrupt during an interactive prompt, this # will move the cursor to the next line notice "Shutting down after having received SIGINT" quit 0 setControlCHook(exitImmediatelyOnCtrlC) # equivalent SIGTERM handler when defined(posix): proc exitImmediatelyOnSIGTERM(signal: cint) {.noconv.} = notice "Shutting down after having received SIGTERM" quit 0 c_signal(SIGTERM, exitImmediatelyOnSIGTERM) # Single RNG instance for the application - will be seeded on construction # and avoid using system resources (such as urandom) after that let rng = keys.newRng() case config.cmd of createTestnet: doCreateTestnet(config, rng[]) of noCommand: doRunBeaconNode(config, rng) of deposits: doDeposits(config, rng[]) of wallets: doWallets(config, rng[]) of record: doRecord(config, rng[]) of web3: doWeb3Cmd(config)