nimbus-eth2/beacon_chain/beacon_node.nim

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# 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
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# Standard library
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std/[algorithm, os, tables, strutils, sequtils, times, math, terminal],
std/random,
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# Nimble packages
stew/[objects, byteutils, endians2], 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/common/eth_types_json_serialization,
eth/db/[kvstore, kvstore_sqlite3],
eth/p2p/enode, eth/p2p/discoveryv5/[protocol, enr],
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# Local modules
spec/[datatypes, digest, crypto, beaconstate, helpers, network, presets],
spec/state_transition,
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conf, time, beacon_chain_db, validator_pool, extras,
attestation_pool, eth2_network, eth2_discovery,
beacon_node_common, beacon_node_types,
block_pools/[spec_cache, chain_dag, quarantine, clearance, block_pools_types],
nimbus_binary_common, network_metadata,
mainchain_monitor, version, ssz/[merkleization], merkle_minimal,
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sync_protocol, request_manager, keystore_management, interop, statusbar,
sync_manager, validator_duties, validator_api,
./eth2_processor
const
genesisFile* = "genesis.ssz"
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hasPrompt = not defined(withoutPrompt)
type
RpcServer* = RpcHttpServer
# "state" is already taken by BeaconState
BeaconNodeStatus* = enum
Starting, Running, Stopping
# this needs to be global, so it can be set in the Ctrl+C signal handler
var status = BeaconNodeStatus.Starting
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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_head_slot,
"Slot of the head block of the beacon chain"
# 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"
proc getStateFromSnapshot(conf: BeaconNodeConf, stateSnapshotContents: ref string): NilableBeaconStateRef =
var
genesisPath = conf.dataDir/genesisFile
snapshotContents: TaintedString
writeGenesisFile = false
if conf.stateSnapshot.isSome:
let
snapshotPath = conf.stateSnapshot.get.string
snapshotExt = splitFile(snapshotPath).ext
if cmpIgnoreCase(snapshotExt, ".ssz") != 0:
error "The supplied state snapshot must be a SSZ file",
suppliedPath = snapshotPath
quit 1
snapshotContents = readFile(snapshotPath)
if fileExists(genesisPath):
let genesisContents = readFile(genesisPath)
if snapshotContents != genesisContents:
error "Data directory not empty. Existing genesis state differs from supplied snapshot",
dataDir = conf.dataDir.string, snapshot = snapshotPath
quit 1
else:
debug "No previous genesis state. Importing snapshot",
genesisPath, dataDir = conf.dataDir.string
writeGenesisFile = true
genesisPath = snapshotPath
elif fileExists(genesisPath):
try: snapshotContents = readFile(genesisPath)
except CatchableError as err:
error "Failed to read genesis file", err = err.msg
quit 1
elif stateSnapshotContents != nil:
swap(snapshotContents, TaintedString stateSnapshotContents[])
else:
# No snapshot was provided. We should wait for genesis.
return nil
result = try:
newClone(SSZ.decode(snapshotContents, BeaconState))
except SerializationError:
error "Failed to import genesis file", path = genesisPath
quit 1
info "Loaded genesis state", path = genesisPath
if writeGenesisFile:
try:
notice "Writing genesis to data directory", path = conf.dataDir/genesisFile
writeFile(conf.dataDir/genesisFile, snapshotContents.string)
except CatchableError as err:
error "Failed to persist genesis file to data dir",
err = err.msg, genesisFile = conf.dataDir/genesisFile
quit 1
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,
rng: ref BrHmacDrbgContext,
conf: BeaconNodeConf,
stateSnapshotContents: ref string): Future[BeaconNode] {.async.} =
let
netKeys = getPersistentNetKeys(rng[], conf)
nickname = if conf.nodeName == "auto": shortForm(netKeys)
else: conf.nodeName
db = BeaconChainDB.init(kvStore SqStoreRef.init(conf.databaseDir, "nbc").tryGet())
var mainchainMonitor: MainchainMonitor
if not ChainDAGRef.isInitialized(db):
# Fresh start - need to load a genesis state from somewhere
var genesisState = conf.getStateFromSnapshot(stateSnapshotContents)
# Try file from command line first
if genesisState.isNil:
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
let web3 = web3Provider(conf.web3Url)
let deployedAtAsHash =
if conf.depositContractDeployedAt.get.startsWith "0x":
try: BlockHash.fromHex conf.depositContractDeployedAt.get
except ValueError:
fatal "Invalid hex value specified for deposit-contract-block"
quit 1
else:
let blockNum = try: parseBiggestUInt conf.depositContractDeployedAt.get
except ValueError:
fatal "Invalid nummeric value for deposit-contract-block"
quit 1
await getEth1BlockHash(conf.web3Url, blockId blockNum)
# TODO Could move this to a separate "GenesisMonitor" process or task
# that would do only this - see Paul's proposal for this.
mainchainMonitor = MainchainMonitor.init(
conf.runtimePreset,
web3,
conf.depositContractAddress.get,
Eth1Data(block_hash: deployedAtAsHash.asEth2Digest, deposit_count: 0))
mainchainMonitor.start()
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genesisState = await mainchainMonitor.waitGenesis()
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info "Eth2 genesis state detected",
genesisTime = genesisState.genesisTime,
eth1Block = genesisState.eth1_data.block_hash,
totalDeposits = genesisState.eth1_data.deposit_count
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# This is needed to prove the not nil property from here on
if genesisState == nil:
doAssert false
else:
if genesisState.slot != GENESIS_SLOT:
# TODO how to get a block from a non-genesis state?
error "Starting from non-genesis state not supported",
stateSlot = genesisState.slot,
stateRoot = hash_tree_root(genesisState[])
quit 1
let tailBlock = get_initial_beacon_block(genesisState[])
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try:
ChainDAGRef.preInit(db, genesisState[], tailBlock)
doAssert ChainDAGRef.isInitialized(db), "preInit should have initialized db"
except CatchableError as e:
error "Failed to initialize database", err = e.msg
quit 1
if stateSnapshotContents != nil:
# The memory for the initial snapshot won't be needed anymore
stateSnapshotContents[] = ""
# TODO 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)
quarantine = QuarantineRef()
if mainchainMonitor.isNil and
conf.web3Url.len > 0 and
conf.depositContractAddress.isSome:
mainchainMonitor = MainchainMonitor.init(
conf.runtimePreset,
web3Provider(conf.web3Url),
conf.depositContractAddress.get,
chainDag.headState.data.data.eth1_data)
# TODO if we don't have any validators attached, we don't need a mainchain
# monitor
mainchainMonitor.start()
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, enrForkId)
attestationPool = newClone(AttestationPool.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,
attachedValidators: ValidatorPool.init(),
chainDag: chainDag,
quarantine: quarantine,
attestationPool: attestationPool,
mainchainMonitor: mainchainMonitor,
beaconClock: BeaconClock.init(chainDag.headState.data.data),
rpcServer: rpcServer,
forkDigest: enrForkId.forkDigest,
topicBeaconBlocks: topicBeaconBlocks,
topicAggregateAndProofs: topicAggregateAndProofs,
)
proc getWallTime(): BeaconTime = res.beaconClock.now()
res.processor = Eth2Processor.new(
conf, chainDag, attestationPool, quarantine, getWallTime)
res.requestManager = RequestManager.init(
network, res.processor.blocksQueue)
res.addLocalValidators()
# 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/v0.12.2/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/v0.12.2/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) =
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
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/v0.12.2/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/v0.12.2/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.getAttestationHandlers()
)
proc onSlotStart(node: BeaconNode, lastSlot, scheduledSlot: Slot) {.gcsafe, async.} =
## Called at the beginning of a slot - usually every slot, but sometimes might
## skip a few in case we're running late.
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## 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
logScope: pcs = "slot_start"
let
# The slot we should be at, according to the clock
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beaconTime = node.beaconClock.now()
wallSlot = beaconTime.toSlot()
finalizedEpoch =
node.chainDag.finalizedHead.blck.slot.compute_epoch_at_slot()
info "Slot start",
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lastSlot = shortLog(lastSlot),
scheduledSlot = shortLog(scheduledSlot),
beaconTime = shortLog(beaconTime),
peers = node.network.peersCount,
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()
# Offset backwards slightly to allow this epoch's finalization check to occur
if scheduledSlot > 3 and node.config.stopAtEpoch > 0'u64 and
(scheduledSlot - 3).compute_epoch_at_slot() >= node.config.stopAtEpoch:
info "Stopping at pre-chosen epoch",
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chosenEpoch = node.config.stopAtEpoch,
epoch = scheduledSlot.compute_epoch_at_slot(),
slot = scheduledSlot
# Brute-force, but ensure it's reliable enough to run in CI.
quit(0)
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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",
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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
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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)
# 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 = 96
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",
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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 typically, what consitutes correct actions stays constant between slot
# updates and is stable across some epoch transitions as well - see how
# we can avoid recalculating everything here
# 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..
discard node.updateHead(slot)
# TODO is the slot of the clock or the head block more interesting? provide
# rationale in comment
beacon_head_slot.set slot.int64
# Time passes in here..
asyncCheck 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())
let syncQueueLen = node.syncManager.syncQueueLen
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.
node.attestationSubnets.subscribedSubnets[0].len +
node.attestationSubnets.subscribedSubnets[1].len == 0 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.
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debug "Enabling topic subscriptions",
wallSlot = slot,
headSlot = node.chainDag.head.slot,
syncQueueLen
await node.addMessageHandlers()
when false:
if slot.isEpoch:
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:
info "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)
debug "onSecond task completed", sleepTime, processingTime
proc startSyncManager(node: BeaconNode) =
func getLocalHeadSlot(): Slot =
node.chainDag.head.slot
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proc getLocalWallSlot(): Slot {.gcsafe.} =
let epoch = node.beaconClock.now().slotOrZero.compute_epoch_at_slot() +
1'u64
epoch.compute_start_slot_at_epoch()
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func getFirstSlotAtFinalizedEpoch(): Slot {.gcsafe.} =
let fepoch = node.chainDag.headState.data.data.finalized_checkpoint.epoch
compute_start_slot_at_epoch(fepoch)
proc scoreCheck(peer: Peer): bool =
if peer.score < PeerScoreLowLimit:
try:
debug "Peer score is too low, removing it from PeerPool", peer = peer,
peer_score = peer.score, score_low_limit = PeerScoreLowLimit,
score_high_limit = PeerScoreHighLimit
except:
discard
false
else:
true
node.network.peerPool.setScoreCheck(scoreCheck)
node.syncManager = newSyncManager[Peer, PeerID](
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node.network.peerPool, getLocalHeadSlot, getLocalWallSlot,
getFirstSlotAtFinalizedEpoch, node.processor.blocksQueue, chunkSize = 32
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)
node.syncManager.start()
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proc currentSlot(node: BeaconNode): Slot =
node.beaconClock.now.slotOrZero
proc connectedPeersCount(node: BeaconNode): int =
nbc_peers.value.int
proc installBeaconApiHandlers(rpcServer: RpcServer, node: BeaconNode) =
rpcServer.rpc("getBeaconHead") do () -> Slot:
return node.chainDag.head.slot
rpcServer.rpc("getChainHead") do () -> JsonNode:
let
head = node.chainDag.head
finalized = node.chainDag.headState.data.data.finalized_checkpoint
justified = node.chainDag.headState.data.data.current_justified_checkpoint
return %* {
"head_slot": head.slot,
"head_block_root": head.root.data.toHex(),
"finalized_slot": finalized.epoch * SLOTS_PER_EPOCH,
"finalized_block_root": finalized.root.data.toHex(),
"justified_slot": justified.epoch * SLOTS_PER_EPOCH,
"justified_block_root": justified.root.data.toHex(),
}
rpcServer.rpc("getSyncing") do () -> bool:
let
wallSlot = currentSlot(node)
headSlot = node.chainDag.head.slot
# FIXME: temporary hack: If more than 1 block away from expected head, then we are "syncing"
return (headSlot + 1) < wallSlot
template requireOneOf(x, y: distinct Option) =
if x.isNone xor y.isNone:
raise newException(CatchableError,
"Please specify one of " & astToStr(x) & " or " & astToStr(y))
template jsonResult(x: auto): auto =
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StringOfJson(Json.encode(x))
rpcServer.rpc("getBeaconBlock") do (slot: Option[Slot],
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root: Option[Eth2Digest]) -> StringOfJson:
requireOneOf(slot, root)
var blockHash: Eth2Digest
if root.isSome:
blockHash = root.get
else:
let foundRef = node.chainDag.getBlockByPreciseSlot(slot.get)
if foundRef != nil:
blockHash = foundRef.root
else:
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return StringOfJson("null")
let dbBlock = node.db.getBlock(blockHash)
if dbBlock.isSome:
return jsonResult(dbBlock.get)
else:
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return StringOfJson("null")
rpcServer.rpc("getBeaconState") do (slot: Option[Slot],
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root: Option[Eth2Digest]) -> StringOfJson:
requireOneOf(slot, root)
if slot.isSome:
# TODO sanity check slot so that it doesn't cause excessive rewinding
let blk = node.chainDag.head.atSlot(slot.get)
node.chainDag.withState(node.chainDag.tmpState, blk):
return jsonResult(state)
else:
let tmp = BeaconStateRef() # TODO use tmpState - but load the entire StateData!
let state = node.db.getState(root.get, tmp[], noRollback)
if state:
return jsonResult(tmp[])
else:
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return StringOfJson("null")
rpcServer.rpc("getNetworkPeerId") do () -> string:
return $publicKey(node.network)
rpcServer.rpc("getNetworkPeers") do () -> seq[string]:
for peerId, peer in node.network.peerPool:
result.add $peerId
rpcServer.rpc("getNetworkEnr") do () -> string:
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return $node.network.discovery.localNode.record
proc installDebugApiHandlers(rpcServer: RpcServer, node: BeaconNode) =
rpcServer.rpc("getNodeVersion") do () -> string:
return "Nimbus/" & fullVersionStr
rpcServer.rpc("getSpecPreset") do () -> JsonNode:
var res = newJObject()
genStmtList:
for presetValue in PresetValue:
if presetValue notin ignoredValues + runtimeValues:
let
settingSym = ident($presetValue)
settingKey = newLit(toLowerAscii($presetValue))
let f = quote do:
res[`settingKey`] = %(presets.`settingSym`)
yield f
for field, value in fieldPairs(node.config.runtimePreset):
res[field] = when value isnot Version: %value
else: %value.toUInt64
return res
rpcServer.rpc("peers") do () -> JsonNode:
var res = newJObject()
var peers = newJArray()
for id, peer in node.network.peerPool:
peers.add(
%(
info: shortLog(peer.info),
connectionState: $peer.connectionState,
score: peer.score,
)
)
res.add("peers", peers)
return res
proc installRpcHandlers(rpcServer: RpcServer, node: BeaconNode) =
rpcServer.installValidatorApiHandlers(node)
rpcServer.installBeaconApiHandlers(node)
rpcServer.installDebugApiHandlers(node)
proc installMessageValidators(node: BeaconNode) =
# https://github.com/ethereum/eth2.0-specs/blob/v0.12.2/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): bool =
node.processor[].attestationValidator(attestation, ci))
node.network.addValidator(
getAggregateAndProofsTopic(node.forkDigest),
proc(signedAggregateAndProof: SignedAggregateAndProof): bool =
node.processor[].aggregateValidator(signedAggregateAndProof))
node.network.addValidator(
node.topicBeaconBlocks,
proc (signedBlock: SignedBeaconBlock): bool =
node.processor[].blockValidator(signedBlock))
proc removeMessageHandlers(node: BeaconNode) =
var unsubscriptions: seq[Future[void]]
for topic in [
getBeaconBlocksTopic(node.forkDigest),
getVoluntaryExitsTopic(node.forkDigest),
getProposerSlashingsTopic(node.forkDigest),
getAttesterSlashingsTopic(node.forkDigest),
getAggregateAndProofsTopic(node.forkDigest)]:
unsubscriptions.add node.network.unsubscribe(topic)
for subnet in 0'u64 ..< ATTESTATION_SUBNET_COUNT:
unsubscriptions.add node.network.unsubscribe(
getAttestationTopic(node.forkDigest, subnet))
waitFor allFutures(unsubscriptions)
proc stop*(node: BeaconNode) =
status = BeaconNodeStatus.Stopping
info "Graceful shutdown"
waitFor node.network.stop()
proc run*(node: BeaconNode) =
if status == BeaconNodeStatus.Starting:
# it might have been set to "Stopping" with Ctrl+C
status = 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()
# main event loop
while status == BeaconNodeStatus.Running:
try:
poll()
except CatchableError as e:
debug "Exception in poll()", exc = e.name, err = e.msg
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# time to say goodbye
node.stop()
var gPidFile: string
proc createPidFile(filename: string) =
createDir splitFile(filename).dir
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writeFile filename, $os.getCurrentProcessId()
gPidFile = filename
addQuitProc proc {.noconv.} = 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.startLookingForPeers()
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info "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))
info "Starting beacon node",
version = fullVersionStr,
nim = shortNimBanner(),
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timeSinceFinalization =
int64(finalizedHead.slot.toBeaconTime()) -
int64(node.beaconClock.now()),
head = shortLog(head),
finalizedHead = shortLog(finalizedHead),
SLOTS_PER_EPOCH,
SECONDS_PER_SLOT,
SPEC_VERSION,
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dataDir = node.config.dataDir.string,
pcs = "start_beacon_node"
if genesisTime.inFuture:
notice "Waiting for genesis", genesisIn = genesisTime.offset
waitFor node.initializeNetworking()
node.run()
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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)
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when hasPrompt:
from unicode import Rune
import prompt
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func providePromptCompletions*(line: seq[Rune], cursorPos: int): seq[string] =
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# TODO
# The completions should be generated with the general-purpose command-line
# parsing API of Confutils
result = @[]
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proc processPromptCommands(p: ptr Prompt) {.thread.} =
while true:
var cmd = p[].readLine()
case cmd
of "quit":
quit 0
else:
p[].writeLine("Unknown command: " & cmd)
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proc initPrompt(node: BeaconNode) =
if isatty(stdout) and node.config.statusBarEnabled:
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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)
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# 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)
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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 = $node.currentSlot
if slotStr.len > 3: slotStr = slotStr[^3..^1]
slotStr
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of "attached_validators_balance":
var balance = uint64(0)
# TODO slow linear scan!
for idx, b in node.chainDag.headState.data.data.balances:
if node.getAttachedValidator(
node.chainDag.headState.data.data, ValidatorIndex(idx)) != nil:
balance += b
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formatGwei(balance)
else:
# We ignore typos for now and just render the expression
# as it was written. TODO: come up with a good way to show
# an error message to the user.
"$" & expr
var statusBar = StatusBarView.init(
node.config.statusBarContents,
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dataResolver)
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when compiles(defaultChroniclesStream.output.writer):
defaultChroniclesStream.output.writer =
proc (logLevel: LogLevel, msg: LogOutputStr) {.gcsafe, 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)
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proc statusBarUpdatesPollingLoop() {.async.} =
while true:
update statusBar
await sleepAsync(chronos.seconds(1))
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traceAsyncErrors statusBarUpdatesPollingLoop()
# var t: Thread[ptr Prompt]
# createThread(t, processPromptCommands, addr p)
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programMain:
var
config = makeBannerAndConfig(clientId, BeaconNodeConf)
# This is ref so we can mutate it (to erase it) after the initial loading.
stateSnapshotContents: ref string
setupLogging(config.logLevel, config.logFile)
if config.eth2Network.isSome:
let
networkName = config.eth2Network.get
metadata = case toLowerAscii(networkName)
of "mainnet":
mainnetMetadata
of "altona":
altonaMetadata
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of "medalla":
medallaMetadata
of "testnet0":
testnet0Metadata
of "testnet1":
testnet1Metadata
else:
if fileExists(networkName):
try:
Json.loadFile(networkName, Eth2NetworkMetadata)
except SerializationError as err:
echo err.formatMsg(networkName)
quit 1
else:
fatal "Unrecognized network name", networkName
quit 1
if metadata.incompatible:
fatal "The selected network is not compatible with the current build",
reason = metadata.incompatibilityDesc
quit 1
config.runtimePreset = metadata.runtimePreset
if config.cmd == noCommand:
for node in metadata.bootstrapNodes:
config.bootstrapNodes.add node
if config.stateSnapshot.isNone and metadata.genesisData.len > 0:
stateSnapshotContents = 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 = networkName, `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
else:
config.runtimePreset = defaultRuntimePreset
# 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:
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(
defaultRuntimePreset, 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
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let bootstrapFile = config.outputBootstrapFile.string
if bootstrapFile.len > 0:
let
networkKeys = getPersistentNetKeys(rng[], config)
metadata = 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(metadata.attnets))])
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writeFile(bootstrapFile, bootstrapEnr.tryGet().toURI)
echo "Wrote ", bootstrapFile
of noCommand:
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debug "Launching beacon node",
version = fullVersionStr,
bls_backend = $BLS_BACKEND,
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cmdParams = commandLineParams(),
config
createPidFile(config.dataDir.string / "beacon_node.pid")
config.createDumpDirs()
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var node = waitFor BeaconNode.init(rng, config, stateSnapshotContents)
## Ctrl+C handling
proc controlCHandler() {.noconv.} =
when defined(windows):
# workaround for https://github.com/nim-lang/Nim/issues/4057
setupForeignThreadGc()
info "Shutting down after having received SIGINT"
status = BeaconNodeStatus.Stopping
setControlCHook(controlCHandler)
when hasPrompt:
initPrompt(node)
when useInsecureFeatures:
if config.metricsEnabled:
let metricsAddress = config.metricsAddress
info "Starting metrics HTTP server",
address = metricsAddress, port = config.metricsPort
metrics.startHttpServer($metricsAddress, config.metricsPort)
if node.nickname != "":
dynamicLogScope(node = node.nickname): node.start()
else:
node.start()
of deposits:
case config.depositsCmd
of DepositsCmd.create:
var mnemonic: Mnemonic
defer: burnMem(mnemonic)
var walletPath: WalletPathPair
if config.existingWalletId.isSome:
let id = config.existingWalletId.get
let found = keystore_management.findWallet(config, id)
if found.isOk:
walletPath = found.get
else:
fatal "Unable to find wallet with the specified name/uuid",
id, err = found.error
quit 1
var unlocked = unlockWalletInteractively(walletPath.wallet)
if unlocked.isOk:
swap(mnemonic, 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(mnemonic, walletRes.get.mnemonic)
walletPath = walletRes.get.walletPath
createDir(config.outValidatorsDir)
createDir(config.outSecretsDir)
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let deposits = generateDeposits(
config.runtimePreset,
rng[],
mnemonic,
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:
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config.outValidatorsDir / "deposit_data-" & $epochTime() & ".json"
let launchPadDeposits =
mapIt(deposits.value, LaunchPadDeposit.init(config.runtimePreset, it))
Json.saveFile(depositDataPath, launchPadDeposits)
info "Deposit data written", filename = depositDataPath
walletPath.wallet.nextAccount += deposits.value.len
let status = saveWallet(walletPath)
if status.isErr:
error "Failed to update wallet file after generating deposits",
wallet = walletPath.path,
error = status.error
quit 1
except CatchableError as err:
error "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:
var walletRes = createWalletInteractively(rng[], config)
if walletRes.isErr:
fatal "Unable to create wallet", err = walletRes.error
quit 1
burnMem(walletRes.get.mnemonic)
of WalletsCmd.list:
for kind, walletFile in walkDir(config.walletsDir):
if kind != pcFile: continue
let walletRes = loadWallet(walletFile)
if walletRes.isOk:
echo walletRes.get.longName
else:
warn "Found corrupt wallet file",
wallet = walletFile, error = walletRes.error
of WalletsCmd.restore:
restoreWalletInteractively(rng[], config)