nimbus-eth2/beacon_chain/nimbus_beacon_node.nim

1278 lines
47 KiB
Nim

# beacon_chain
# Copyright (c) 2018-2020 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
import
# Standard library
std/[os, tables, strutils, sequtils, times, math, terminal, osproc, random],
# Nimble packages
stew/[objects, byteutils, endians2, io2], stew/shims/macros,
chronos, confutils, metrics, json_rpc/[rpcserver, jsonmarshal],
chronicles, bearssl, blscurve,
json_serialization/std/[options, sets, net], serialization/errors,
eth/[keys, async_utils],
eth/db/[kvstore, kvstore_sqlite3],
eth/p2p/enode, eth/p2p/discoveryv5/[protocol, enr],
# Local modules
./rpc/[beacon_api, config_api, debug_api, event_api, nimbus_api, node_api,
validator_api],
spec/[datatypes, digest, crypto, beaconstate, helpers, network, presets],
spec/[weak_subjectivity],
conf, time, beacon_chain_db, validator_pool, extras,
attestation_pool, exit_pool, eth2_network, eth2_discovery,
beacon_node_common, beacon_node_types, beacon_node_status,
block_pools/[chain_dag, quarantine, clearance, block_pools_types],
nimbus_binary_common, network_metadata,
eth1_monitor, version, ssz/[merkleization], merkle_minimal,
sync_protocol, request_manager, keystore_management, interop, statusbar,
sync_manager, validator_duties, filepath,
validator_slashing_protection, ./eth2_processor
const
hasPrompt = not defined(withoutPrompt)
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"
# 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"
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 startEth1Monitor(db: BeaconChainDB,
eth1Network: Option[Eth1Network],
conf: BeaconNodeConf): Future[Eth1Monitor] {.async.} =
let eth1MonitorRes = await Eth1Monitor.init(
db,
conf.runtimePreset,
conf.web3Url,
conf.depositContractAddress.get,
conf.depositContractDeployedAt.get,
eth1Network)
result = if eth1MonitorRes.isOk:
eth1MonitorRes.get
else:
fatal "Failed to start Eth1 monitor",
reason = eth1MonitorRes.error,
web3Url = conf.web3Url,
depositContractAddress = conf.depositContractAddress.get,
depositContractDeployedAt = conf.depositContractDeployedAt.get
quit 1
result.start()
proc init*(T: type BeaconNode,
rng: ref BrHmacDrbgContext,
conf: BeaconNodeConf,
genesisStateContents: ref string,
eth1Network: Option[Eth1Network]): Future[BeaconNode] {.async.} =
let
netKeys = getPersistentNetKeys(rng[], conf)
nickname = if conf.nodeName == "auto": shortForm(netKeys)
else: conf.nodeName
db = BeaconChainDB.init(conf.runtimePreset, conf.databaseDir)
var
eth1Monitor: Eth1Monitor
genesisState, checkpointState: ref BeaconState
checkpointBlock: SignedBeaconBlock
if conf.finalizedCheckpointState.isSome:
let checkpointStatePath = conf.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 conf.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 = conf.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 conf.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
if not ChainDAGRef.isInitialized(db):
var
tailState: ref BeaconState
tailBlock: SignedBeaconBlock
if genesisStateContents == nil and checkpointState == nil:
# 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 conf.web3Url.len == 0:
fatal "Web3 URL not specified"
quit 1
if conf.depositContractAddress.isNone:
fatal "Deposit contract address not specified"
quit 1
if conf.depositContractDeployedAt.isNone:
# When we don't have a known genesis state, the network metadata
# must specify the deployment block of the contract.
fatal "Deposit contract deployment block 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.
eth1Monitor = await startEth1Monitor(db, eth1Network, conf)
genesisState = await 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
elif genesisStateContents == nil:
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 "The baked-in state must be valid"
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
# TODO(zah) check that genesis given on command line (if any) matches database
let
chainDagFlags = if conf.verifyFinalization: {verifyFinalization}
else: {}
chainDag = init(ChainDAGRef, conf.runtimePreset, db, chainDagFlags)
beaconClock = BeaconClock.init(chainDag.headState.data.data)
quarantine = QuarantineRef()
if conf.weakSubjectivityCheckpoint.isSome:
let
currentSlot = beaconClock.now.slotOrZero
isCheckpointStale = not is_within_weak_subjectivity_period(
currentSlot,
chainDag.headState.data.data,
conf.weakSubjectivityCheckpoint.get)
if isCheckpointStale:
error "Weak subjectivity checkpoint is stale",
currentSlot,
checkpoint = conf.weakSubjectivityCheckpoint.get,
headStateSlot = chainDag.headState.data.data.slot
quit 1
if checkpointState != nil:
chainDag.setTailState(checkpointState[], checkpointBlock)
if eth1Monitor.isNil and
conf.web3Url.len > 0 and
conf.depositContractAddress.isSome and
conf.depositContractDeployedAt.isSome:
# TODO(zah) if we don't have any validators attached,
# we don't need a mainchain monitor
eth1Monitor = await startEth1Monitor(db, eth1Network, conf)
let rpcServer = if conf.rpcEnabled:
RpcServer.init(conf.rpcAddress, conf.rpcPort)
else:
nil
let
enrForkId = enrForkIdFromState(chainDag.headState.data.data)
topicBeaconBlocks = getBeaconBlocksTopic(enrForkId.forkDigest)
topicAggregateAndProofs = getAggregateAndProofsTopic(enrForkId.forkDigest)
network = createEth2Node(rng, conf, netKeys, enrForkId)
attestationPool = newClone(AttestationPool.init(chainDag, quarantine))
exitPool = newClone(ExitPool.init(chainDag, quarantine))
var res = BeaconNode(
nickname: nickname,
graffitiBytes: if conf.graffiti.isSome: conf.graffiti.get.GraffitiBytes
else: defaultGraffitiBytes(),
network: network,
netKeys: netKeys,
db: db,
config: conf,
chainDag: chainDag,
quarantine: quarantine,
attestationPool: attestationPool,
exitPool: exitPool,
eth1Monitor: eth1Monitor,
beaconClock: beaconClock,
rpcServer: rpcServer,
forkDigest: enrForkId.forkDigest,
topicBeaconBlocks: topicBeaconBlocks,
topicAggregateAndProofs: topicAggregateAndProofs,
)
res.attachedValidators = ValidatorPool.init(
SlashingProtectionDB.init(
chainDag.headState.data.data.genesis_validators_root,
kvStore SqStoreRef.init(conf.validatorsDir(), "slashing_protection").tryGet()
)
)
proc getWallTime(): BeaconTime = res.beaconClock.now()
res.processor = Eth2Processor.new(
conf, chainDag, attestationPool, exitPool, quarantine, getWallTime)
res.requestManager = RequestManager.init(
network, res.processor.blocksQueue)
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)
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]) =
var attestationSubscriptions: seq[Future[void]] = @[]
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0/specs/phase0/p2p-interface.md#attestations-and-aggregation
for subnet in subnets:
attestationSubscriptions.add(node.network.subscribe(
getAttestationTopic(node.forkDigest, subnet)))
waitFor allFutures(attestationSubscriptions)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0/specs/phase0/p2p-interface.md#metadata
node.network.metadata.seq_number += 1
for subnet in subnets:
node.network.metadata.attnets[subnet] = true
proc cycleAttestationSubnets(node: BeaconNode, slot: Slot) =
static: doAssert RANDOM_SUBNETS_PER_VALIDATOR == 1
let epochParity = slot.epoch mod 2
var attachedValidators: seq[ValidatorIndex]
for validatorIndex in 0 ..< node.chainDag.headState.data.data.validators.len:
if node.getAttachedValidator(
node.chainDag.headState.data.data, validatorIndex.ValidatorIndex) != nil:
attachedValidators.add validatorIndex.ValidatorIndex
if attachedValidators.len == 0:
return
let (newAttestationSubnets, expiringSubnets, newSubnets) =
get_attestation_subnet_changes(
node.chainDag.headState.data.data, attachedValidators,
node.attestationSubnets, slot.epoch)
node.attestationSubnets = newAttestationSubnets
debug "Attestation subnets",
expiring_subnets = expiringSubnets,
current_epoch_subnets =
node.attestationSubnets.subscribedSubnets[1 - epochParity],
upcoming_subnets = node.attestationSubnets.subscribedSubnets[epochParity],
new_subnets = newSubnets,
stability_subnet = node.attestationSubnets.stabilitySubnet,
stability_subnet_expiration_epoch =
node.attestationSubnets.stabilitySubnetExpirationEpoch
block:
var unsubscriptions: seq[Future[void]] = @[]
for expiringSubnet in expiringSubnets:
unsubscriptions.add(node.network.unsubscribe(
getAttestationTopic(node.forkDigest, expiringSubnet)))
waitFor allFutures(unsubscriptions)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0/specs/phase0/p2p-interface.md#metadata
# The race condition window is smaller by placing the fast, local, and
# synchronous operation after a variable-latency, asynchronous action.
node.network.metadata.seq_number += 1
for expiringSubnet in expiringSubnets:
node.network.metadata.attnets[expiringSubnet] = false
node.installAttestationSubnetHandlers(newSubnets)
block:
let subscribed_subnets =
node.attestationSubnets.subscribedSubnets[0] +
node.attestationSubnets.subscribedSubnets[1] +
{node.attestationSubnets.stabilitySubnet.uint8}
for subnet in 0'u8 ..< ATTESTATION_SUBNET_COUNT:
doAssert node.network.metadata.attnets[subnet] ==
(subnet in subscribed_subnets)
proc getAttestationHandlers(node: BeaconNode): Future[void] =
var initialSubnets: set[uint8]
for i in 0'u8 ..< ATTESTATION_SUBNET_COUNT:
initialSubnets.incl i
node.installAttestationSubnetHandlers(initialSubnets)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0/specs/phase0/validator.md#phase-0-attestation-subnet-stability
let wallEpoch = node.beaconClock.now().slotOrZero().epoch
node.attestationSubnets.stabilitySubnet = rand(ATTESTATION_SUBNET_COUNT - 1).uint64
node.attestationSubnets.stabilitySubnetExpirationEpoch =
wallEpoch + getStabilitySubnetLength()
# Sets the "current" and "future" attestation subnets. One of these gets
# replaced by get_attestation_subnet_changes() immediately.
node.attestationSubnets.subscribedSubnets[0] = initialSubnets
node.attestationSubnets.subscribedSubnets[1] = initialSubnets
node.network.subscribe(getAggregateAndProofsTopic(node.forkDigest))
proc addMessageHandlers(node: BeaconNode): Future[void] =
allFutures(
# As a side-effect, this gets the attestation subnets too.
node.network.subscribe(node.topicBeaconBlocks),
node.network.subscribe(getAttesterSlashingsTopic(node.forkDigest)),
node.network.subscribe(getProposerSlashingsTopic(node.forkDigest)),
node.network.subscribe(getVoluntaryExitsTopic(node.forkDigest)),
node.getAttestationHandlers()
)
func getTopicSubscriptionEnabled(node: BeaconNode): bool =
node.attestationSubnets.subscribedSubnets[0].len +
node.attestationSubnets.subscribedSubnets[1].len > 0
proc removeMessageHandlers(node: BeaconNode): Future[void] =
node.attestationSubnets.subscribedSubnets[0] = {}
node.attestationSubnets.subscribedSubnets[1] = {}
doAssert not node.getTopicSubscriptionEnabled()
var unsubscriptions = mapIt(
[getBeaconBlocksTopic(node.forkDigest),
getVoluntaryExitsTopic(node.forkDigest),
getProposerSlashingsTopic(node.forkDigest),
getAttesterSlashingsTopic(node.forkDigest),
getAggregateAndProofsTopic(node.forkDigest)],
node.network.unsubscribe(it))
for subnet in 0'u64 ..< ATTESTATION_SUBNET_COUNT:
unsubscriptions.add node.network.unsubscribe(
getAttestationTopic(node.forkDigest, subnet))
allFutures(unsubscriptions)
proc onSlotStart(node: BeaconNode, lastSlot, scheduledSlot: Slot) {.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 successfully 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
beaconTime = node.beaconClock.now()
wallSlot = beaconTime.toSlot()
finalizedEpoch =
node.chainDag.finalizedHead.blck.slot.compute_epoch_at_slot()
info "Slot start",
lastSlot = shortLog(lastSlot),
scheduledSlot = shortLog(scheduledSlot),
beaconTime = shortLog(beaconTime),
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)
# Check before any re-scheduling of onSlotStart()
checkIfShouldStopAtEpoch(scheduledSlot, node.config.stopAtEpoch)
if not wallSlot.afterGenesis or (wallSlot.slot < lastSlot):
let
slot =
if wallSlot.afterGenesis: wallSlot.slot
else: GENESIS_SLOT
nextSlot = slot + 1 # At least GENESIS_SLOT + 1!
# 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",
beaconTime = shortLog(beaconTime),
lastSlot = shortLog(lastSlot),
scheduledSlot = shortLog(scheduledSlot),
nextSlot = shortLog(nextSlot)
addTimer(saturate(node.beaconClock.fromNow(nextSlot))) do (p: pointer):
asyncCheck node.onSlotStart(slot, nextSlot)
return
let
slot = wallSlot.slot # afterGenesis == true!
nextSlot = slot + 1
beacon_slot.set slot.int64
finalization_delay.set scheduledSlot.epoch.int64 - finalizedEpoch.int64
if node.config.verifyFinalization:
verifyFinalization(node, scheduledSlot)
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",
lastSlot = shortLog(lastSlot),
slot = shortLog(slot),
nextSlot = shortLog(nextSlot),
scheduledSlot = shortLog(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 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..
node.processor[].updateHead(slot)
# Time passes in here..
await node.handleValidatorDuties(lastSlot, slot)
let
nextSlotStart = saturate(node.beaconClock.fromNow(nextSlot))
info "Slot end",
slot = shortLog(slot),
nextSlot = shortLog(nextSlot),
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())
# 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
await 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
await node.removeMessageHandlers()
# Subscription or unsubscription might have occurred; recheck
if slot.isEpoch and node.getTopicSubscriptionEnabled:
node.cycleAttestationSubnets(slot)
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()
addTimer(nextSlotStart) do (p: pointer):
asyncCheck node.onSlotStart(slot, 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.processor.blocksQueue, 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/v1.0.0/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.db.close()
notice "Database 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
curSlot = node.beaconClock.now().slotOrZero()
nextSlot = curSlot + 1 # No earlier than GENESIS_SLOT + 1
fromNow = saturate(node.beaconClock.fromNow(nextSlot))
info "Scheduling first slot action",
beaconTime = shortLog(node.beaconClock.now()),
nextSlot = shortLog(nextSlot),
fromNow = shortLog(fromNow)
addTimer(fromNow) do (p: pointer):
asyncCheck node.onSlotStart(curSlot, nextSlot)
node.onSecondLoop = runOnSecondLoop(node)
node.blockProcessingLoop = node.processor.runQueueProcessingLoop()
node.requestManager.start()
node.startSyncManager()
## 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)
# 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.} =
await node.network.startListening()
let addressFile = node.config.dataDir / "beacon_node.enr"
writeFile(addressFile, node.network.announcedENR.toURI)
await node.network.start()
notice "Networking initialized",
enr = node.network.announcedENR.toURI,
libp2p = shortLog(node.network.switch.peerInfo)
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,
nim = shortNimBanner(),
timeSinceFinalization =
finalizedHead.slot.toBeaconTime() -
node.beaconClock.now(),
head = shortLog(head),
finalizedHead = shortLog(finalizedHead),
SLOTS_PER_EPOCH,
SECONDS_PER_SLOT,
SPEC_VERSION,
dataDir = node.config.dataDir.string
if genesisTime.inFuture:
notice "Waiting for genesis", genesisIn = genesisTime.offset
waitFor node.initializeNetworking()
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 '.'
result.add $remainder
while result[^1] == '0':
result.setLen(result.len - 1)
when hasPrompt:
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) =
if isatty(stdout) and node.config.statusBarEnabled:
enableTrueColors()
# 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()
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 = $node.currentSlot
if slotStr.len > 3: slotStr = slotStr[^3..^1]
slotStr
of "attached_validators_balance":
var balance = uint64(0)
# TODO slow linear scan!
for idx, b in node.chainDag.headState.data.data.balances:
if node.getAttachedValidator(
node.chainDag.headState.data.data, ValidatorIndex(idx)) != nil:
balance += b
formatGwei(balance)
of "sync_status":
if isNil(node.syncManager):
"pending"
else:
if node.syncManager.inProgress:
node.syncManager.syncStatus
else:
"synced"
else:
# We ignore typos for now and just render the expression
# as it was written. TODO: come up with a good way to show
# an error message to the user.
"$" & 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.} =
while true:
update statusBar
await sleepAsync(chronos.seconds(1))
traceAsyncErrors statusBarUpdatesPollingLoop()
# var t: Thread[ptr Prompt]
# createThread(t, processPromptCommands, addr p)
programMain:
var
config = makeBannerAndConfig(clientId, BeaconNodeConf)
# This is ref so we can mutate it (to erase it) after the initial loading.
genesisStateContents: ref string
eth1Network: Option[Eth1Network]
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)
if config.eth2Network.isSome:
let metadata = getMetadataForNetwork(config.eth2Network.get)
config.runtimePreset = metadata.runtimePreset
if config.cmd == noCommand:
for node in metadata.bootstrapNodes:
config.bootstrapNodes.add node
if metadata.genesisData.len > 0:
genesisStateContents = newClone metadata.genesisData
template checkForIncompatibleOption(flagName, fieldName) =
# TODO: This will have to be reworked slightly when we introduce config files.
# We'll need to keep track of the "origin" of the config value, so we can
# discriminate between values from config files that can be overridden and
# regular command-line options (that may conflict).
if config.fieldName.isSome:
fatal "Invalid CLI arguments specified. You must not specify '--network' and '" & flagName & "' at the same time",
networkParam = config.eth2Network.get, `flagName` = config.fieldName.get
quit 1
checkForIncompatibleOption "deposit-contract", depositContractAddress
checkForIncompatibleOption "deposit-contract-block", depositContractDeployedAt
config.depositContractAddress = some metadata.depositContractAddress
config.depositContractDeployedAt = some metadata.depositContractDeployedAt
eth1Network = metadata.eth1Network
else:
config.runtimePreset = defaultRuntimePreset
when const_preset == "mainnet":
if config.depositContractAddress.isNone:
config.depositContractAddress =
some mainnetMetadata.depositContractAddress
if config.depositContractDeployedAt.isNone:
config.depositContractDeployedAt =
some mainnetMetadata.depositContractDeployedAt
eth1Network = some mainnet
# 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()
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.cmd
of createTestnet:
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[Deposit]
for i in config.firstValidator.int ..< launchPadDeposits.len:
deposits.add Deposit(data: launchPadDeposits[i] as DepositData)
attachMerkleProofs(deposits)
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
var
initialState = initialize_beacon_state_from_eth1(
config.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),
config.bootstrapPort,
config.bootstrapPort,
[toFieldPair("eth2", SSZ.encode(enrForkIdFromState initialState[])),
toFieldPair("attnets", SSZ.encode(netMetadata.attnets))])
writeFile(bootstrapFile, bootstrapEnr.tryGet().toURI)
echo "Wrote ", bootstrapFile
of noCommand:
warn "You are running an alpha version of Nimbus - it is not suitable for mainnet!",
version = fullVersionStr
info "Launching beacon node",
version = fullVersionStr,
bls_backend = $BLS_BACKEND,
cmdParams = commandLineParams(),
config
createPidFile(config.dataDir.string / "beacon_node.pid")
config.createDumpDirs()
when useInsecureFeatures:
if config.metricsEnabled:
let metricsAddress = config.metricsAddress
notice "Starting metrics HTTP server",
address = metricsAddress, port = config.metricsPort
metrics.startHttpServer($metricsAddress, config.metricsPort)
# 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.
var node = waitFor BeaconNode.init(
rng, config, genesisStateContents, eth1Network)
if bnStatus == BeaconNodeStatus.Stopping:
return
# The memory for the initial snapshot won't be needed anymore
if genesisStateContents != nil: genesisStateContents[] = ""
when hasPrompt:
initPrompt(node)
if node.nickname != "":
dynamicLogScope(node = node.nickname): node.start()
else:
node.start()
of deposits:
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(
config.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(config.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.`import`:
importKeystoresFromDir(
rng[],
config.importedDepositsDir.string,
config.validatorsDir, config.secretsDir)
of DepositsCmd.status:
echo "The status command is not implemented yet"
quit 1
of wallets:
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)