nimbus-eth2/beacon_chain/validators/beacon_validators.nim

1798 lines
72 KiB
Nim

# beacon_chain
# Copyright (c) 2018-2023 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.
{.push raises: [].}
# This module is responsible for handling beacon node validators, ie those that
# that are running directly in the beacon node and not in a separate validator
# client process - we name these "beacon validators" while those running
# outside are "client validators".
# This module also contains implementation logic for the REST validator API.
import
# Standard library
std/[os, tables, sequtils],
# Nimble packages
stew/[assign2, byteutils],
chronos, metrics,
chronicles, chronicles/timings,
json_serialization/std/[options, sets, net],
eth/db/kvstore,
web3/ethtypes,
kzg4844,
# Local modules
../spec/datatypes/[phase0, altair, bellatrix],
../spec/[
eth2_merkleization, forks, helpers, network, signatures, state_transition,
validator],
../consensus_object_pools/[
spec_cache, blockchain_dag, block_clearance, attestation_pool, exit_pool,
sync_committee_msg_pool, consensus_manager],
../el/el_manager,
../networking/eth2_network,
../sszdump, ../sync/sync_manager,
../gossip_processing/block_processor,
".."/[conf, beacon_clock, beacon_node],
"."/[
keystore_management, slashing_protection, validator_duties, validator_pool],
".."/spec/mev/rest_capella_mev_calls
from eth/async_utils import awaitWithTimeout
const
delayBuckets = [-Inf, -4.0, -2.0, -1.0, -0.5, -0.1, -0.05,
0.05, 0.1, 0.5, 1.0, 2.0, 4.0, 8.0, Inf]
BUILDER_STATUS_DELAY_TOLERANCE = 3.seconds
BUILDER_VALIDATOR_REGISTRATION_DELAY_TOLERANCE = 6.seconds
# Metrics for tracking attestation and beacon block loss
declareCounter beacon_light_client_finality_updates_sent,
"Number of LC finality updates sent by this peer"
declareCounter beacon_light_client_optimistic_updates_sent,
"Number of LC optimistic updates sent by this peer"
declareCounter beacon_blocks_proposed,
"Number of beacon chain blocks sent by this peer"
declareCounter beacon_block_production_errors,
"Number of times we failed to produce a block"
declareCounter beacon_block_payload_errors,
"Number of times execution client failed to produce block payload"
declareCounter beacon_blobs_sidecar_payload_errors,
"Number of times execution client failed to produce blobs sidecar"
# Metrics for tracking external block builder usage
declareCounter beacon_block_builder_missed_with_fallback,
"Number of beacon chain blocks where an attempt to use an external block builder failed with fallback"
declareCounter beacon_block_builder_missed_without_fallback,
"Number of beacon chain blocks where an attempt to use an external block builder failed without possible fallback"
declareGauge(attached_validator_balance,
"Validator balance at slot end of the first 64 validators, in Gwei",
labels = ["pubkey"])
declarePublicGauge(attached_validator_balance_total,
"Validator balance of all attached validators, in Gwei")
logScope: topics = "beacval"
type
BlobsBundle = tuple[blobs: deneb.Blobs,
kzgs: KzgCommitments,
proofs: seq[kzg_abi.KZGProof]]
ForkedBlockResult =
Result[tuple[blck: ForkedBeaconBlock,
blockValue: Wei,
blobsBundleOpt: Opt[BlobsBundle]], string]
BlindedBlockResult[SBBB] =
Result[tuple[blindedBlckPart: SBBB, blockValue: UInt256], string]
BlockProposalBidFutures[SBBB] = object
engineBidAvailable: bool
engineBlockFut: Future[ForkedBlockResult]
builderBidAvailable: bool
payloadBuilderBidFut: Future[BlindedBlockResult[SBBB]]
proc getValidator*(validators: auto,
pubkey: ValidatorPubKey): Opt[ValidatorAndIndex] =
let idx = validators.findIt(it.pubkey == pubkey)
if idx == -1:
# We allow adding a validator even if its key is not in the state registry:
# it might be that the deposit for this validator has not yet been processed
Opt.none ValidatorAndIndex
else:
Opt.some ValidatorAndIndex(index: ValidatorIndex(idx),
validator: validators[idx])
proc addValidators*(node: BeaconNode) =
info "Loading validators", validatorsDir = node.config.validatorsDir(),
keystore_cache_available = not(isNil(node.keystoreCache))
let epoch = node.currentSlot().epoch
for keystore in listLoadableKeystores(node.config, node.keystoreCache):
let
data = withState(node.dag.headState):
getValidator(forkyState.data.validators.asSeq(), keystore.pubkey)
index =
if data.isSome():
Opt.some(data.get().index)
else:
Opt.none(ValidatorIndex)
feeRecipient = node.consensusManager[].getFeeRecipient(
keystore.pubkey, index, epoch)
gasLimit = node.consensusManager[].getGasLimit(keystore.pubkey)
v = node.attachedValidators[].addValidator(keystore, feeRecipient,
gasLimit)
v.updateValidator(data)
let dynamicStores =
try:
waitFor(queryValidatorsSource(node.config))
except CatchableError as exc:
warn "Unexpected error happens while polling validator's source",
error = $exc.name, reason = $exc.msg
default(seq[KeystoreData])
for keystore in dynamicStores:
let
data =
withState(node.dag.headState):
getValidator(forkyState.data.validators.asSeq(), keystore.pubkey)
index =
if data.isSome():
Opt.some(data.get().index)
else:
Opt.none(ValidatorIndex)
feeRecipient =
node.consensusManager[].getFeeRecipient(keystore.pubkey, index, epoch)
gasLimit = node.consensusManager[].getGasLimit(keystore.pubkey)
v = node.attachedValidators[].addValidator(keystore, feeRecipient,
gasLimit)
v.updateValidator(data)
proc getValidator*(node: BeaconNode, idx: ValidatorIndex): Opt[AttachedValidator] =
let key = ? node.dag.validatorKey(idx)
node.attachedValidators[].getValidator(key.toPubKey())
proc getValidatorForDuties*(
node: BeaconNode, idx: ValidatorIndex, slot: Slot,
slashingSafe = false): Opt[AttachedValidator] =
let key = ? node.dag.validatorKey(idx)
node.attachedValidators[].getValidatorForDuties(
key.toPubKey(), slot, slashingSafe)
proc isSynced*(node: BeaconNode, head: BlockRef): bool =
## TODO This function is here as a placeholder for some better heurestics to
## determine if we're in sync and should be producing blocks and
## attestations. Generally, the problem is that slot time keeps advancing
## even when there are no blocks being produced, so there's no way to
## distinguish validators geniunely going missing from the node not being
## well connected (during a network split or an internet outage for
## example). It would generally be correct to simply keep running as if
## we were the only legit node left alive, but then we run into issues:
## with enough many empty slots, the validator pool is emptied leading
## to empty committees and lots of empty slot processing that will be
## thrown away as soon as we're synced again.
let
# The slot we should be at, according to the clock
beaconTime = node.beaconClock.now()
wallSlot = beaconTime.toSlot()
# TODO if everyone follows this logic, the network will not recover from a
# halt: nobody will be producing blocks because everone expects someone
# else to do it
not wallSlot.afterGenesis or
head.slot + node.config.syncHorizon >= wallSlot.slot
proc handleLightClientUpdates*(node: BeaconNode, slot: Slot) {.async.} =
static: doAssert lightClientFinalityUpdateSlotOffset ==
lightClientOptimisticUpdateSlotOffset
let sendTime = node.beaconClock.fromNow(
slot.light_client_finality_update_time())
if sendTime.inFuture:
debug "Waiting to send LC updates", slot, delay = shortLog(sendTime.offset)
await sleepAsync(sendTime.offset)
withForkyFinalityUpdate(node.dag.lcDataStore.cache.latest):
when lcDataFork > LightClientDataFork.None:
let signature_slot = forkyFinalityUpdate.signature_slot
if slot != signature_slot:
return
let num_active_participants =
forkyFinalityUpdate.sync_aggregate.num_active_participants
if num_active_participants < MIN_SYNC_COMMITTEE_PARTICIPANTS:
return
let finalized_slot = forkyFinalityUpdate.finalized_header.beacon.slot
if finalized_slot > node.lightClientPool[].latestForwardedFinalitySlot:
template msg(): auto = forkyFinalityUpdate
let sendResult =
await node.network.broadcastLightClientFinalityUpdate(msg)
# Optimization for message with ephemeral validity, whether sent or not
node.lightClientPool[].latestForwardedFinalitySlot = finalized_slot
if sendResult.isOk:
beacon_light_client_finality_updates_sent.inc()
notice "LC finality update sent", message = shortLog(msg)
else:
warn "LC finality update failed to send",
error = sendResult.error()
let attested_slot = forkyFinalityUpdate.attested_header.beacon.slot
if attested_slot > node.lightClientPool[].latestForwardedOptimisticSlot:
let msg = forkyFinalityUpdate.toOptimistic
let sendResult =
await node.network.broadcastLightClientOptimisticUpdate(msg)
# Optimization for message with ephemeral validity, whether sent or not
node.lightClientPool[].latestForwardedOptimisticSlot = attested_slot
if sendResult.isOk:
beacon_light_client_optimistic_updates_sent.inc()
notice "LC optimistic update sent", message = shortLog(msg)
else:
warn "LC optimistic update failed to send",
error = sendResult.error()
proc createAndSendAttestation(node: BeaconNode,
fork: Fork,
genesis_validators_root: Eth2Digest,
validator: AttachedValidator,
data: AttestationData,
committeeLen: int,
indexInCommittee: int,
subnet_id: SubnetId) {.async.} =
try:
let
signature = block:
let res = await validator.getAttestationSignature(
fork, genesis_validators_root, data)
if res.isErr():
warn "Unable to sign attestation", validator = shortLog(validator),
attestationData = shortLog(data), error_msg = res.error()
return
res.get()
attestation =
Attestation.init(
[uint64 indexInCommittee], committeeLen, data, signature).expect(
"valid data")
validator.doppelgangerActivity(attestation.data.slot.epoch)
# Logged in the router
let res = await node.router.routeAttestation(
attestation, subnet_id, checkSignature = false)
if not res.isOk():
return
if node.config.dumpEnabled:
dump(node.config.dumpDirOutgoing, attestation.data, validator.pubkey)
except CatchableError as exc:
# An error could happen here when the signature task fails - we must
# not leak the exception because this is an asyncSpawn task
warn "Error sending attestation", err = exc.msg
proc getBlockProposalEth1Data*(node: BeaconNode,
state: ForkedHashedBeaconState):
BlockProposalEth1Data =
let finalizedEpochRef = node.dag.getFinalizedEpochRef()
result = node.elManager.getBlockProposalData(
state, finalizedEpochRef.eth1_data,
finalizedEpochRef.eth1_deposit_index)
proc getFeeRecipient(node: BeaconNode,
pubkey: ValidatorPubKey,
validatorIdx: ValidatorIndex,
epoch: Epoch): Eth1Address =
node.consensusManager[].getFeeRecipient(pubkey, Opt.some(validatorIdx), epoch)
proc getGasLimit(node: BeaconNode,
pubkey: ValidatorPubKey): uint64 =
node.consensusManager[].getGasLimit(pubkey)
from web3/engine_api_types import PayloadExecutionStatus
from ../spec/datatypes/capella import BeaconBlock, ExecutionPayload
from ../spec/datatypes/deneb import BeaconBlock, ExecutionPayload, shortLog
from ../spec/beaconstate import get_expected_withdrawals
proc getExecutionPayload(
PayloadType: type ForkyExecutionPayloadForSigning,
node: BeaconNode, proposalState: ref ForkedHashedBeaconState,
epoch: Epoch, validator_index: ValidatorIndex): Future[Opt[PayloadType]] {.async.} =
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/bellatrix/validator.md#executionpayload
let feeRecipient = block:
let pubkey = node.dag.validatorKey(validator_index)
if pubkey.isNone():
error "Cannot get proposer pubkey, bug?", validator_index
default(Eth1Address)
else:
node.getFeeRecipient(pubkey.get().toPubKey(), validator_index, epoch)
try:
let
beaconHead = node.attestationPool[].getBeaconHead(node.dag.head)
executionHead = withState(proposalState[]):
when consensusFork >= ConsensusFork.Bellatrix:
forkyState.data.latest_execution_payload_header.block_hash
else:
(static(default(Eth2Digest)))
latestSafe = beaconHead.safeExecutionPayloadHash
latestFinalized = beaconHead.finalizedExecutionPayloadHash
timestamp = withState(proposalState[]):
compute_timestamp_at_slot(forkyState.data, forkyState.data.slot)
random = withState(proposalState[]):
get_randao_mix(forkyState.data, get_current_epoch(forkyState.data))
withdrawals = withState(proposalState[]):
when consensusFork >= ConsensusFork.Capella:
get_expected_withdrawals(forkyState.data)
else:
@[]
payload = await node.elManager.getPayload(
PayloadType, beaconHead.blck.bid.root, executionHead, latestSafe,
latestFinalized, timestamp, random, feeRecipient, withdrawals)
if payload.isNone:
error "Failed to obtain execution payload from EL",
executionHeadBlock = executionHead
return Opt.none(PayloadType)
return Opt.some payload.get
except CatchableError as err:
beacon_block_payload_errors.inc()
error "Error creating non-empty execution payload",
msg = err.msg
return Opt.none PayloadType
proc makeBeaconBlockForHeadAndSlot*(
PayloadType: type ForkyExecutionPayloadForSigning,
node: BeaconNode, randao_reveal: ValidatorSig,
validator_index: ValidatorIndex, graffiti: GraffitiBytes, head: BlockRef,
slot: Slot,
# These parameters are for the builder API
execution_payload: Opt[PayloadType],
transactions_root: Opt[Eth2Digest],
execution_payload_root: Opt[Eth2Digest],
withdrawals_root: Opt[Eth2Digest]):
Future[ForkedBlockResult] {.async.} =
# Advance state to the slot that we're proposing for
var cache = StateCache()
let
# The clearance state already typically sits at the right slot per
# `advanceClearanceState`
# TODO can use `valueOr:`/`return err($error)` if/when
# https://github.com/status-im/nim-stew/issues/161 is addressed
maybeState = node.dag.getProposalState(head, slot, cache)
if maybeState.isErr:
beacon_block_production_errors.inc()
return err($maybeState.error)
let
state = maybeState.get
payloadFut =
if execution_payload.isSome:
# Builder API
# In Capella, only get withdrawals root from relay.
# The execution payload will be small enough to be safe to copy because
# it won't have transactions (it's blinded)
var modified_execution_payload = execution_payload
withState(state[]):
when consensusFork >= ConsensusFork.Capella and
PayloadType.toFork >= ConsensusFork.Capella:
let withdrawals = List[Withdrawal, MAX_WITHDRAWALS_PER_PAYLOAD](
get_expected_withdrawals(forkyState.data))
if withdrawals_root.isNone or
hash_tree_root(withdrawals) != withdrawals_root.get:
# If engine API returned a block, will use that
return err("Builder relay provided incorrect withdrawals root")
# Otherwise, the state transition function notices that there are
# too few withdrawals.
assign(modified_execution_payload.get.executionPayload.withdrawals,
withdrawals)
let fut = newFuture[Opt[PayloadType]]("given-payload")
fut.complete(modified_execution_payload)
fut
elif slot.epoch < node.dag.cfg.BELLATRIX_FORK_EPOCH or
not state[].is_merge_transition_complete:
let fut = newFuture[Opt[PayloadType]]("empty-payload")
fut.complete(Opt.some(default(PayloadType)))
fut
else:
# Create execution payload while packing attestations
getExecutionPayload(PayloadType, node, state, slot.epoch, validator_index)
eth1Proposal = node.getBlockProposalEth1Data(state[])
if eth1Proposal.hasMissingDeposits:
beacon_block_production_errors.inc()
warn "Eth1 deposits not available. Skipping block proposal", slot
return err("Eth1 deposits not available")
let
attestations =
node.attestationPool[].getAttestationsForBlock(state[], cache)
exits = withState(state[]):
node.validatorChangePool[].getBeaconBlockValidatorChanges(
node.dag.cfg, forkyState.data)
syncAggregate =
if slot.epoch >= node.dag.cfg.ALTAIR_FORK_EPOCH:
node.syncCommitteeMsgPool[].produceSyncAggregate(head.bid, slot)
else:
SyncAggregate.init()
payload = (await payloadFut).valueOr:
beacon_block_production_errors.inc()
warn "Unable to get execution payload. Skipping block proposal",
slot, validator_index
return err("Unable to get execution payload")
let blck = makeBeaconBlock(
node.dag.cfg,
state[],
validator_index,
randao_reveal,
eth1Proposal.vote,
graffiti,
attestations,
eth1Proposal.deposits,
exits,
syncAggregate,
payload,
noRollback, # Temporary state - no need for rollback
cache,
verificationFlags = {},
transactions_root = transactions_root,
execution_payload_root = execution_payload_root).mapErr do (error: cstring) -> string:
# This is almost certainly a bug, but it's complex enough that there's a
# small risk it might happen even when most proposals succeed - thus we
# log instead of asserting
beacon_block_production_errors.inc()
error "Cannot create block for proposal",
slot, head = shortLog(head), error
$error
var blobsBundleOpt = Opt.none(BlobsBundle)
when payload is deneb.ExecutionPayloadForSigning:
let bb: BlobsBundle = (blobs: payload.blobs,
kzgs: payload.kzgs,
proofs: payload.proofs)
blobsBundleOpt = Opt.some(bb)
return if blck.isOk:
ok((blck.get, payload.blockValue, blobsBundleOpt))
else:
err(blck.error)
# workaround for https://github.com/nim-lang/Nim/issues/20900 to avoid default
# parameters
proc makeBeaconBlockForHeadAndSlot*(
PayloadType: type ForkyExecutionPayloadForSigning, node: BeaconNode, randao_reveal: ValidatorSig,
validator_index: ValidatorIndex, graffiti: GraffitiBytes, head: BlockRef,
slot: Slot):
Future[ForkedBlockResult] {.async.} =
return await makeBeaconBlockForHeadAndSlot(
PayloadType, node, randao_reveal, validator_index, graffiti, head, slot,
execution_payload = Opt.none(PayloadType),
transactions_root = Opt.none(Eth2Digest),
execution_payload_root = Opt.none(Eth2Digest),
withdrawals_root = Opt.none(Eth2Digest))
proc getBlindedExecutionPayload[
EPH: bellatrix.ExecutionPayloadHeader | capella.ExecutionPayloadHeader |
deneb.ExecutionPayloadHeader](
node: BeaconNode, payloadBuilderClient: RestClientRef, slot: Slot,
executionBlockRoot: Eth2Digest, pubkey: ValidatorPubKey):
Future[BlindedBlockResult[EPH]] {.async.} =
when EPH is deneb.ExecutionPayloadHeader:
let blindedHeader = default(RestResponse[GetHeaderResponseDeneb])
debugRaiseAssert $denebImplementationMissing &
": makeBlindedBeaconBlockForHeadAndSlot"
elif EPH is capella.ExecutionPayloadHeader:
let blindedHeader = awaitWithTimeout(
payloadBuilderClient.getHeaderCapella(slot, executionBlockRoot, pubkey),
BUILDER_PROPOSAL_DELAY_TOLERANCE):
return err "Timeout obtaining Capella blinded header from builder"
elif EPH is bellatrix.ExecutionPayloadHeader:
let blindedHeader = awaitWithTimeout(
payloadBuilderClient.getHeaderBellatrix(slot, executionBlockRoot, pubkey),
BUILDER_PROPOSAL_DELAY_TOLERANCE):
return err "Timeout obtaining Bellatrix blinded header from builder"
else:
static: doAssert false
const httpOk = 200
if blindedHeader.status != httpOk:
return err "getBlindedExecutionPayload: non-200 HTTP response"
else:
if not verify_builder_signature(
node.dag.cfg.genesisFork, blindedHeader.data.data.message,
blindedHeader.data.data.message.pubkey,
blindedHeader.data.data.signature):
return err "getBlindedExecutionPayload: signature verification failed"
return ok((
blindedBlckPart: blindedHeader.data.data.message.header,
blockValue: blindedHeader.data.data.message.value))
from ./message_router_mev import
copyFields, getFieldNames, unblindAndRouteBlockMEV
func constructSignableBlindedBlock[T](
blck: bellatrix.BeaconBlock | capella.BeaconBlock,
executionPayloadHeader: bellatrix.ExecutionPayloadHeader |
capella.ExecutionPayloadHeader): T =
const
blckFields = getFieldNames(typeof(blck))
blckBodyFields = getFieldNames(typeof(blck.body))
var blindedBlock: T
# https://github.com/ethereum/builder-specs/blob/v0.3.0/specs/bellatrix/validator.md#block-proposal
copyFields(blindedBlock.message, blck, blckFields)
copyFields(blindedBlock.message.body, blck.body, blckBodyFields)
assign(
blindedBlock.message.body.execution_payload_header, executionPayloadHeader)
blindedBlock
func constructPlainBlindedBlock[
T: capella_mev.BlindedBeaconBlock, EPH: capella.ExecutionPayloadHeader](
blck: ForkyBeaconBlock, executionPayloadHeader: EPH): T =
const
blckFields = getFieldNames(typeof(blck))
blckBodyFields = getFieldNames(typeof(blck.body))
var blindedBlock: T
# https://github.com/ethereum/builder-specs/blob/v0.3.0/specs/bellatrix/validator.md#block-proposal
copyFields(blindedBlock, blck, blckFields)
copyFields(blindedBlock.body, blck.body, blckBodyFields)
assign(blindedBlock.body.execution_payload_header, executionPayloadHeader)
blindedBlock
proc blindedBlockCheckSlashingAndSign[T](
node: BeaconNode, slot: Slot, validator: AttachedValidator,
validator_index: ValidatorIndex, nonsignedBlindedBlock: T):
Future[Result[T, string]] {.async.} =
# Check with slashing protection before submitBlindedBlock
let
fork = node.dag.forkAtEpoch(slot.epoch)
genesis_validators_root = node.dag.genesis_validators_root
blockRoot = hash_tree_root(nonsignedBlindedBlock.message)
signingRoot = compute_block_signing_root(
fork, genesis_validators_root, slot, blockRoot)
notSlashable = node.attachedValidators
.slashingProtection
.registerBlock(validator_index, validator.pubkey, slot, signingRoot)
if notSlashable.isErr:
warn "Slashing protection activated for MEV block",
blockRoot = shortLog(blockRoot), blck = shortLog(nonsignedBlindedBlock),
signingRoot = shortLog(signingRoot),
validator = validator.pubkey,
slot = slot,
existingProposal = notSlashable.error
return err("MEV proposal would be slashable: " & $notSlashable.error)
var blindedBlock = nonsignedBlindedBlock
blindedBlock.signature =
block:
let res = await validator.getBlockSignature(
fork, genesis_validators_root, slot, blockRoot, blindedBlock.message)
if res.isErr():
return err("Unable to sign block: " & res.error())
res.get()
return ok blindedBlock
proc getUnsignedBlindedBeaconBlock[
T: capella_mev.SignedBlindedBeaconBlock |
deneb_mev.SignedBlindedBeaconBlock](
node: BeaconNode, slot: Slot, validator: AttachedValidator,
validator_index: ValidatorIndex, forkedBlock: ForkedBeaconBlock,
executionPayloadHeader: bellatrix.ExecutionPayloadHeader |
capella.ExecutionPayloadHeader |
deneb.ExecutionPayloadHeader): Result[T, string] =
withBlck(forkedBlock):
when consensusFork >= ConsensusFork.Deneb:
debugRaiseAssert $denebImplementationMissing & ": getUnsignedBlindedBeaconBlock"
return err("getUnsignedBlindedBeaconBlock: Deneb blinded block creation not implemented")
elif consensusFork >= ConsensusFork.Bellatrix:
when not (
(T is capella_mev.SignedBlindedBeaconBlock and
consensusFork == ConsensusFork.Capella)):
return err("getUnsignedBlindedBeaconBlock: mismatched block/payload types")
else:
return ok constructSignableBlindedBlock[T](blck, executionPayloadHeader)
else:
return err("getUnsignedBlindedBeaconBlock: attempt to construct pre-Bellatrix blinded block")
proc getBlindedBlockParts[EPH: ForkyExecutionPayloadHeader](
node: BeaconNode, payloadBuilderClient: RestClientRef, head: BlockRef,
pubkey: ValidatorPubKey, slot: Slot, randao: ValidatorSig,
validator_index: ValidatorIndex, graffiti: GraffitiBytes):
Future[Result[(EPH, UInt256, ForkedBeaconBlock), string]] {.async.} =
let
executionBlockRoot = node.dag.loadExecutionBlockHash(head)
executionPayloadHeader =
try:
awaitWithTimeout(
getBlindedExecutionPayload[EPH](
node, payloadBuilderClient, slot, executionBlockRoot, pubkey),
BUILDER_PROPOSAL_DELAY_TOLERANCE):
BlindedBlockResult[EPH].err("getBlindedExecutionPayload timed out")
except RestDecodingError as exc:
BlindedBlockResult[EPH].err(
"getBlindedExecutionPayload REST decoding error: " & exc.msg)
except CatchableError as exc:
BlindedBlockResult[EPH].err(
"getBlindedExecutionPayload error: " & exc.msg)
if executionPayloadHeader.isErr:
warn "Could not obtain blinded execution payload header",
error = executionPayloadHeader.error, slot, validator_index,
head = shortLog(head)
# Haven't committed to the MEV block, so allow EL fallback.
return err(executionPayloadHeader.error)
# When creating this block, need to ensure it uses the MEV-provided execution
# payload, both to avoid repeated calls to network services and to ensure the
# consistency of this block (e.g., its state root being correct). Since block
# processing does not work directly using blinded blocks, fix up transactions
# root after running the state transition function on an otherwise equivalent
# non-blinded block without transactions.
when EPH is bellatrix.ExecutionPayloadHeader:
type PayloadType = bellatrix.ExecutionPayloadForSigning
let withdrawals_root = Opt.none Eth2Digest
elif EPH is capella.ExecutionPayloadHeader:
type PayloadType = capella.ExecutionPayloadForSigning
let withdrawals_root =
Opt.some executionPayloadHeader.get.blindedBlckPart.withdrawals_root
elif EPH is deneb.ExecutionPayloadHeader:
type PayloadType = deneb.ExecutionPayloadForSigning
let withdrawals_root =
Opt.some executionPayloadHeader.get.blindedBlckPart.withdrawals_root
else:
static: doAssert false
var shimExecutionPayload: PayloadType
copyFields(
shimExecutionPayload.executionPayload,
executionPayloadHeader.get.blindedBlckPart, getFieldNames(EPH))
# In Capella and later, this doesn't have withdrawals, which each node knows
# regardless of EL or builder API. makeBeaconBlockForHeadAndSlot fills it in
# when it detects builder API usage.
let newBlock = await makeBeaconBlockForHeadAndSlot(
PayloadType, node, randao, validator_index, graffiti, head, slot,
execution_payload = Opt.some shimExecutionPayload,
transactions_root =
Opt.some executionPayloadHeader.get.blindedBlckPart.transactions_root,
execution_payload_root =
Opt.some hash_tree_root(executionPayloadHeader.get.blindedBlckPart),
withdrawals_root = withdrawals_root)
if newBlock.isErr():
# Haven't committed to the MEV block, so allow EL fallback.
return err(newBlock.error) # already logged elsewhere!
let forkedBlck = newBlock.get()
return ok(
(executionPayloadHeader.get.blindedBlckPart,
executionPayloadHeader.get.blockValue,
forkedBlck.blck))
proc getBuilderBid[
SBBB: capella_mev.SignedBlindedBeaconBlock |
deneb_mev.SignedBlindedBeaconBlock](
node: BeaconNode, payloadBuilderClient: RestClientRef, head: BlockRef,
validator: AttachedValidator, slot: Slot, randao: ValidatorSig,
validator_index: ValidatorIndex):
Future[BlindedBlockResult[SBBB]] {.async.} =
## Returns the unsigned blinded block obtained from the Builder API.
## Used by the BN's own validators, but not the REST server
when SBBB is capella_mev.SignedBlindedBeaconBlock:
type EPH = capella.ExecutionPayloadHeader
elif SBBB is deneb_mev.SignedBlindedBeaconBlock:
type EPH = deneb.ExecutionPayloadHeader
else:
static: doAssert false
let blindedBlockParts = await getBlindedBlockParts[EPH](
node, payloadBuilderClient, head, validator.pubkey, slot, randao,
validator_index, node.graffitiBytes)
if blindedBlockParts.isErr:
# Not signed yet, fine to try to fall back on EL
beacon_block_builder_missed_with_fallback.inc()
return err blindedBlockParts.error()
# These, together, get combined into the blinded block for signing and
# proposal through the relay network.
let (executionPayloadHeader, bidValue, forkedBlck) = blindedBlockParts.get
let unsignedBlindedBlock = getUnsignedBlindedBeaconBlock[SBBB](
node, slot, validator, validator_index, forkedBlck,
executionPayloadHeader)
if unsignedBlindedBlock.isErr:
return err unsignedBlindedBlock.error()
return ok (unsignedBlindedBlock.get, bidValue)
proc proposeBlockMEV(
node: BeaconNode, payloadBuilderClient: RestClientRef, blindedBlock: auto):
Future[Result[BlockRef, string]] {.async.} =
let unblindedBlockRef = await node.unblindAndRouteBlockMEV(
payloadBuilderClient, blindedBlock)
return if unblindedBlockRef.isOk and unblindedBlockRef.get.isSome:
beacon_blocks_proposed.inc()
ok(unblindedBlockRef.get.get)
else:
# unblindedBlockRef.isOk and unblindedBlockRef.get.isNone indicates that
# the block failed to validate and integrate into the DAG, which for the
# purpose of this return value, is equivalent. It's used to drive Beacon
# REST API output.
#
# https://collective.flashbots.net/t/post-mortem-april-3rd-2023-mev-boost-relay-incident-and-related-timing-issue/1540
# has caused false positives, because
# "A potential mitigation to this attack is to introduce a cutoff timing
# into the proposer's slot whereafter this time (e.g. 3 seconds) the relay
# will no longer return a block to the proposer. Relays began to roll out
# this mitigation in the evening of April 3rd UTC time with a 2 second
# cutoff, and notified other relays to do the same. After receiving
# credible reports of honest validators missing their slots the suggested
# timing cutoff was increased to 3 seconds."
let errMsg =
if unblindedBlockRef.isErr:
unblindedBlockRef.error
else:
"Unblinded block not returned to proposer"
err errMsg
func isEFMainnet(cfg: RuntimeConfig): bool =
cfg.DEPOSIT_CHAIN_ID == 1 and cfg.DEPOSIT_NETWORK_ID == 1
proc makeBlindedBeaconBlockForHeadAndSlot*[
BBB: capella_mev.BlindedBeaconBlock](
node: BeaconNode, payloadBuilderClient: RestClientRef,
randao_reveal: ValidatorSig, validator_index: ValidatorIndex,
graffiti: GraffitiBytes, head: BlockRef, slot: Slot):
Future[BlindedBlockResult[BBB]] {.async.} =
## Requests a beacon node to produce a valid blinded block, which can then be
## signed by a validator. A blinded block is a block with only a transactions
## root, rather than a full transactions list.
##
## This function is used by the validator client, but not the beacon node for
## its own validators.
when BBB is capella_mev.BlindedBeaconBlock:
type EPH = capella.ExecutionPayloadHeader
else:
static: doAssert false
let
pubkey =
# Relevant state for knowledge of validators
withState(node.dag.headState):
if node.dag.cfg.isEFMainnet and livenessFailsafeInEffect(
forkyState.data.block_roots.data, forkyState.data.slot):
# It's head block's slot which matters here, not proposal slot
return err("Builder API liveness failsafe in effect")
if distinctBase(validator_index) >= forkyState.data.validators.lenu64:
debug "makeBlindedBeaconBlockForHeadAndSlot: invalid validator index",
head = shortLog(head),
validator_index,
validators_len = forkyState.data.validators.len
return err("Invalid validator index")
forkyState.data.validators.item(validator_index).pubkey
blindedBlockParts = await getBlindedBlockParts[EPH](
node, payloadBuilderClient, head, pubkey, slot, randao_reveal,
validator_index, graffiti)
if blindedBlockParts.isErr:
# Don't try EL fallback -- VC specifically requested a blinded block
return err("Unable to create blinded block")
let (executionPayloadHeader, bidValue, forkedBlck) = blindedBlockParts.get
withBlck(forkedBlck):
when consensusFork >= ConsensusFork.Deneb:
debugRaiseAssert $denebImplementationMissing & ": makeBlindedBeaconBlockForHeadAndSlot"
elif consensusFork >= ConsensusFork.Bellatrix:
when ((consensusFork == ConsensusFork.Bellatrix and
EPH is bellatrix.ExecutionPayloadHeader) or
(consensusFork == ConsensusFork.Capella and
EPH is capella.ExecutionPayloadHeader)):
return ok (constructPlainBlindedBlock[BBB, EPH](
blck, executionPayloadHeader), bidValue)
else:
return err("makeBlindedBeaconBlockForHeadAndSlot: mismatched block/payload types")
else:
return err("Attempt to create pre-Bellatrix blinded block")
proc collectBidFutures(
SBBB: typedesc, EPS: typedesc, node: BeaconNode,
payloadBuilderClient: RestClientRef, validator: AttachedValidator,
validator_index: ValidatorIndex, head: BlockRef, slot: Slot,
randao: ValidatorSig): Future[BlockProposalBidFutures[SBBB]] {.async.} =
let usePayloadBuilder =
if not payloadBuilderClient.isNil:
withState(node.dag.headState):
# Head slot, not proposal slot, matters here
# TODO it might make some sense to allow use of builder API if local
# EL fails -- i.e. it would change priorities, so any block from the
# execution layer client would override builder API. But it seems an
# odd requirement to produce no block at all in those conditions.
(not node.dag.cfg.isEFMainnet) or (not livenessFailsafeInEffect(
forkyState.data.block_roots.data, forkyState.data.slot))
else:
false
let
payloadBuilderBidFut =
if usePayloadBuilder:
when not (EPS is bellatrix.ExecutionPayloadForSigning):
getBuilderBid[SBBB](
node, payloadBuilderClient, head, validator, slot, randao,
validator_index)
else:
let fut = newFuture[BlindedBlockResult[SBBB]]("builder-bid")
fut.complete(BlindedBlockResult[SBBB].err(
"Bellatrix Builder API unsupported"))
fut
else:
let fut = newFuture[BlindedBlockResult[SBBB]]("builder-bid")
fut.complete(BlindedBlockResult[SBBB].err(
"either payload builder disabled or liveness failsafe active"))
fut
engineBlockFut = makeBeaconBlockForHeadAndSlot(
EPS, node, randao, validator_index, node.graffitiBytes, head, slot)
# getBuilderBid times out after BUILDER_PROPOSAL_DELAY_TOLERANCE, with 1 more
# second for remote validators. makeBeaconBlockForHeadAndSlot times out after
# 1 second.
await allFutures(payloadBuilderBidFut, engineBlockFut)
doAssert payloadBuilderBidFut.finished and engineBlockFut.finished
let builderBidAvailable =
if payloadBuilderBidFut.completed:
if payloadBuilderBidFut.read().isOk:
true
elif usePayloadBuilder:
info "Payload builder error",
slot, head = shortLog(head), validator = shortLog(validator),
err = payloadBuilderBidFut.read().error()
false
else:
# Effectively the same case, but without the log message
false
else:
info "Payload builder bid future failed",
slot, head = shortLog(head), validator = shortLog(validator),
err = payloadBuilderBidFut.error.msg
false
let engineBidAvailable =
if engineBlockFut.completed:
if engineBlockFut.read.isOk:
true
else:
info "Engine block building error",
slot, head = shortLog(head), validator = shortLog(validator),
err = engineBlockFut.read.error()
false
else:
info "Engine block building failed",
slot, head = shortLog(head), validator = shortLog(validator),
err = engineBlockFut.error.msg
false
return BlockProposalBidFutures[SBBB](
engineBidAvailable: engineBidAvailable,
engineBlockFut: engineBlockFut,
builderBidAvailable: builderBidAvailable,
payloadBuilderBidFut: payloadBuilderBidFut)
func builderBetterBid(
localBlockValueBoost: uint8, builderValue: UInt256, engineValue: Wei): bool =
# Scale down to ensure no overflows; if lower few bits would have been
# otherwise decisive, was close enough not to matter. Calibrate to let
# uint8-range percentages avoid overflowing.
const scalingBits = 10
static: doAssert 1 shl scalingBits >
high(typeof(localBlockValueBoost)).uint16 + 100
let
scaledBuilderValue = (builderValue shr scalingBits) * 100
scaledEngineValue = engineValue shr scalingBits
scaledBuilderValue >
scaledEngineValue * (localBlockValueBoost.uint16 + 100).u256
proc proposeBlockAux(
SBBB: typedesc, EPS: typedesc, node: BeaconNode,
validator: AttachedValidator, validator_index: ValidatorIndex,
head: BlockRef, slot: Slot, randao: ValidatorSig, fork: Fork,
genesis_validators_root: Eth2Digest,
localBlockValueBoost: uint8): Future[BlockRef] {.async.} =
var payloadBuilderClient: RestClientRef
let payloadBuilderClientMaybe = node.getPayloadBuilderClient(
validator_index.distinctBase)
if payloadBuilderClientMaybe.isOk:
payloadBuilderClient = payloadBuilderClientMaybe.get
let collectedBids = await collectBidFutures(
SBBB, EPS, node, payloadBuilderClient, validator, validator_index, head,
slot, randao)
let useBuilderBlock =
if collectedBids.builderBidAvailable:
(not collectedBids.engineBidAvailable) or builderBetterBid(
localBlockValueBoost,
collectedBids.payloadBuilderBidFut.read.get().blockValue,
collectedBids.engineBlockFut.read.get().blockValue)
else:
if not collectedBids.engineBidAvailable:
return head # errors logged in router
false
if useBuilderBlock:
let
blindedBlock = (await blindedBlockCheckSlashingAndSign(
node, slot, validator, validator_index,
collectedBids.payloadBuilderBidFut.read.get.blindedBlckPart)).valueOr:
return head
# Before proposeBlockMEV, can fall back to EL; after, cannot without
# risking slashing.
maybeUnblindedBlock = await proposeBlockMEV(
node, payloadBuilderClient, blindedBlock)
return maybeUnblindedBlock.valueOr:
warn "Blinded block proposal incomplete",
head = shortLog(head), slot, validator_index,
validator = shortLog(validator),
err = maybeUnblindedBlock.error,
blindedBlck = shortLog(blindedBlock)
beacon_block_builder_missed_without_fallback.inc()
return head
var forkedBlck = collectedBids.engineBlockFut.read.get().blck
withBlck(forkedBlck):
let
blockRoot = hash_tree_root(blck)
signingRoot = compute_block_signing_root(
fork, genesis_validators_root, slot, blockRoot)
notSlashable = node.attachedValidators
.slashingProtection
.registerBlock(validator_index, validator.pubkey, slot, signingRoot)
let blobSidecarsOpt =
when blck is deneb.BeaconBlock:
var sidecars: seq[BlobSidecar]
let bundle = collectedBids.engineBlockFut.read.get().blobsBundleOpt.get
let (blobs, kzgs, proofs) = (bundle.blobs, bundle.kzgs, bundle.proofs)
for i in 0..<blobs.len:
var sidecar = BlobSidecar(
block_root: blockRoot,
index: BlobIndex(i),
slot: slot,
block_parent_root: blck.parent_root,
proposer_index: blck.proposer_index,
blob: blobs[i],
kzg_commitment: kzgs[i],
kzg_proof: proofs[i]
)
sidecars.add(sidecar)
Opt.some(sidecars)
elif blck is phase0.BeaconBlock or blck is altair.BeaconBlock or
blck is bellatrix.BeaconBlock or blck is capella.BeaconBlock:
Opt.none(seq[BlobSidecar])
else:
static: doAssert "Unknown BeaconBlock type"
if notSlashable.isErr:
warn "Slashing protection activated for block proposal",
blockRoot = shortLog(blockRoot), blck = shortLog(blck),
signingRoot = shortLog(signingRoot),
validator = validator.pubkey,
slot = slot,
existingProposal = notSlashable.error
return head
let
signature =
block:
let res = await validator.getBlockSignature(
fork, genesis_validators_root, slot, blockRoot, forkedBlck)
if res.isErr():
warn "Unable to sign block",
validator = shortLog(validator), error_msg = res.error()
return head
res.get()
signedBlock =
when blck is phase0.BeaconBlock:
phase0.SignedBeaconBlock(
message: blck, signature: signature, root: blockRoot)
elif blck is altair.BeaconBlock:
altair.SignedBeaconBlock(
message: blck, signature: signature, root: blockRoot)
elif blck is bellatrix.BeaconBlock:
bellatrix.SignedBeaconBlock(
message: blck, signature: signature, root: blockRoot)
elif blck is capella.BeaconBlock:
capella.SignedBeaconBlock(
message: blck, signature: signature, root: blockRoot)
elif blck is deneb.BeaconBlock:
deneb.SignedBeaconBlock(
message: blck, signature: signature, root: blockRoot)
else:
static: doAssert "Unknown SignedBeaconBlock type"
signedBlobs =
when blck is phase0.BeaconBlock or blck is altair.BeaconBlock or
blck is bellatrix.BeaconBlock or blck is capella.BeaconBlock:
Opt.none(SignedBlobSidecars)
elif blck is deneb.BeaconBlock:
var signed: seq[SignedBlobSidecar]
let blobSidecars = blobSidecarsOpt.get()
for i in 0..<blobs.len:
let res = validator.getBlobSignature(fork, genesis_validators_root,
slot, blobSidecars[i])
if res.isErr():
warn "Unable to sign blob",
reason = res.error()
return
let signature = res.get()
signed.add(deneb.SignedBlobSidecar(
message: blobSidecars[i],
signature: signature))
Opt.some(signed)
else:
static: doAssert "Unknown SignedBeaconBlock type"
newBlockRef =
(await node.router.routeSignedBeaconBlock(signedBlock, signedBlobs)).valueOr:
return head # Errors logged in router
if newBlockRef.isNone():
return head # Validation errors logged in router
notice "Block proposed",
blockRoot = shortLog(blockRoot), blck = shortLog(blck),
signature = shortLog(signature), validator = shortLog(validator)
beacon_blocks_proposed.inc()
return newBlockRef.get()
proc proposeBlock(node: BeaconNode,
validator: AttachedValidator,
validator_index: ValidatorIndex,
head: BlockRef,
slot: Slot): Future[BlockRef] {.async.} =
if head.slot >= slot:
# We should normally not have a head newer than the slot we're proposing for
# but this can happen if block proposal is delayed
warn "Skipping proposal, have newer head already",
headSlot = shortLog(head.slot),
headBlockRoot = shortLog(head.root),
slot = shortLog(slot)
return head
let
fork = node.dag.forkAtEpoch(slot.epoch)
genesis_validators_root = node.dag.genesis_validators_root
randao = block:
let res = await validator.getEpochSignature(
fork, genesis_validators_root, slot.epoch)
if res.isErr():
warn "Unable to generate randao reveal",
validator = shortLog(validator), error_msg = res.error()
return head
res.get()
template proposeBlockContinuation(type1, type2: untyped): auto =
await proposeBlockAux(
type1, type2, node, validator, validator_index, head, slot, randao, fork,
genesis_validators_root, node.config.localBlockValueBoost)
return
if slot.epoch >= node.dag.cfg.DENEB_FORK_EPOCH:
proposeBlockContinuation(
deneb_mev.SignedBlindedBeaconBlock, deneb.ExecutionPayloadForSigning)
elif slot.epoch >= node.dag.cfg.CAPELLA_FORK_EPOCH:
proposeBlockContinuation(
capella_mev.SignedBlindedBeaconBlock, capella.ExecutionPayloadForSigning)
else:
proposeBlockContinuation(
capella_mev.SignedBlindedBeaconBlock, bellatrix.ExecutionPayloadForSigning)
proc handleAttestations(node: BeaconNode, head: BlockRef, slot: Slot) =
## Perform all attestations that the validators attached to this node should
## perform during the given slot
if slot + SLOTS_PER_EPOCH < head.slot:
# The latest block we know about is a lot newer than the slot we're being
# asked to attest to - this makes it unlikely that it will be included
# at all.
# TODO the oldest attestations allowed are those that are older than the
# finalized epoch.. also, it seems that posting very old attestations
# is risky from a slashing perspective. More work is needed here.
warn "Skipping attestation, head is too recent",
head = shortLog(head),
slot = shortLog(slot)
return
if slot < node.dag.finalizedHead.slot:
# During checkpoint sync, we implicitly finalize the given slot even if the
# state transition does not yet consider it final - this is a sanity check
# mostly to ensure the `atSlot` below works as expected
warn "Skipping attestation - slot already finalized",
head = shortLog(head),
slot = shortLog(slot),
finalized = shortLog(node.dag.finalizedHead)
return
let attestationHead = head.atSlot(slot)
if head != attestationHead.blck:
# In rare cases, such as when we're busy syncing or just slow, we'll be
# attesting to a past state - we must then recreate the world as it looked
# like back then
notice "Attesting to a state in the past, falling behind?",
attestationHead = shortLog(attestationHead),
head = shortLog(head)
trace "Checking attestations",
attestationHead = shortLog(attestationHead),
head = shortLog(head)
# We need to run attestations exactly for the slot that we're attesting to.
# In case blocks went missing, this means advancing past the latest block
# using empty slots as fillers.
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#validator-assignments
let
epochRef = node.dag.getEpochRef(
attestationHead.blck, slot.epoch, false).valueOr:
warn "Cannot construct EpochRef for attestation head, report bug",
attestationHead = shortLog(attestationHead), slot, error
return
committees_per_slot = get_committee_count_per_slot(epochRef.shufflingRef)
fork = node.dag.forkAtEpoch(slot.epoch)
genesis_validators_root = node.dag.genesis_validators_root
for committee_index in get_committee_indices(committees_per_slot):
let committee = get_beacon_committee(
epochRef.shufflingRef, slot, committee_index)
for index_in_committee, validator_index in committee:
let validator = node.getValidatorForDuties(validator_index, slot).valueOr:
continue
let
data = makeAttestationData(epochRef, attestationHead, committee_index)
# TODO signing_root is recomputed in produceAndSignAttestation/signAttestation just after
signingRoot = compute_attestation_signing_root(
fork, genesis_validators_root, data)
registered = node.attachedValidators
.slashingProtection
.registerAttestation(
validator_index,
validator.pubkey,
data.source.epoch,
data.target.epoch,
signingRoot)
if registered.isOk():
let subnet_id = compute_subnet_for_attestation(
committees_per_slot, data.slot, committee_index)
asyncSpawn createAndSendAttestation(
node, fork, genesis_validators_root, validator, data,
committee.len(), index_in_committee, subnet_id)
else:
warn "Slashing protection activated for attestation",
attestationData = shortLog(data),
signingRoot = shortLog(signingRoot),
validator_index,
validator = shortLog(validator),
badVoteDetails = $registered.error()
proc createAndSendSyncCommitteeMessage(node: BeaconNode,
validator: AttachedValidator,
slot: Slot,
subcommitteeIdx: SyncSubcommitteeIndex,
head: BlockRef) {.async.} =
try:
let
fork = node.dag.forkAtEpoch(slot.epoch)
genesis_validators_root = node.dag.genesis_validators_root
msg =
block:
let res = await validator.getSyncCommitteeMessage(
fork, genesis_validators_root, slot, head.root)
if res.isErr():
warn "Unable to sign committee message",
validator = shortLog(validator), slot = slot,
block_root = shortLog(head.root)
return
res.get()
# Logged in the router
let res = await node.router.routeSyncCommitteeMessage(
msg, subcommitteeIdx, checkSignature = false)
if not res.isOk():
return
if node.config.dumpEnabled:
dump(node.config.dumpDirOutgoing, msg, validator.pubkey)
except CatchableError as exc:
# An error could happen here when the signature task fails - we must
# not leak the exception because this is an asyncSpawn task
notice "Error sending sync committee message", err = exc.msg
proc handleSyncCommitteeMessages(node: BeaconNode, head: BlockRef, slot: Slot) =
# TODO Use a view type to avoid the copy
let
syncCommittee = node.dag.syncCommitteeParticipants(slot + 1)
for subcommitteeIdx in SyncSubcommitteeIndex:
for valIdx in syncSubcommittee(syncCommittee, subcommitteeIdx):
let validator = node.getValidatorForDuties(
valIdx, slot, slashingSafe = true).valueOr:
continue
asyncSpawn createAndSendSyncCommitteeMessage(node, validator, slot,
subcommitteeIdx, head)
proc signAndSendContribution(node: BeaconNode,
validator: AttachedValidator,
subcommitteeIdx: SyncSubcommitteeIndex,
head: BlockRef,
slot: Slot) {.async.} =
try:
let
fork = node.dag.forkAtEpoch(slot.epoch)
genesis_validators_root = node.dag.genesis_validators_root
selectionProof = block:
let res = await validator.getSyncCommitteeSelectionProof(
fork, genesis_validators_root, slot, subcommitteeIdx)
if res.isErr():
warn "Unable to generate committee selection proof",
validator = shortLog(validator), slot,
subnet_id = subcommitteeIdx, error = res.error()
return
res.get()
if not is_sync_committee_aggregator(selectionProof):
return
var
msg = SignedContributionAndProof(
message: ContributionAndProof(
aggregator_index: uint64 validator.index.get,
selection_proof: selectionProof))
if not node.syncCommitteeMsgPool[].produceContribution(
slot,
head.bid,
subcommitteeIdx,
msg.message.contribution):
return
msg.signature = block:
let res = await validator.getContributionAndProofSignature(
fork, genesis_validators_root, msg.message)
if res.isErr():
warn "Unable to sign sync committee contribution",
validator = shortLog(validator), message = shortLog(msg.message),
error_msg = res.error()
return
res.get()
# Logged in the router
discard await node.router.routeSignedContributionAndProof(msg, false)
except CatchableError as exc:
# An error could happen here when the signature task fails - we must
# not leak the exception because this is an asyncSpawn task
warn "Error sending sync committee contribution", err = exc.msg
proc handleSyncCommitteeContributions(
node: BeaconNode, head: BlockRef, slot: Slot) {.async.} =
let
fork = node.dag.forkAtEpoch(slot.epoch)
genesis_validators_root = node.dag.genesis_validators_root
syncCommittee = node.dag.syncCommitteeParticipants(slot + 1)
for subcommitteeIdx in SyncSubcommitteeIndex:
for valIdx in syncSubcommittee(syncCommittee, subcommitteeIdx):
let validator = node.getValidatorForDuties(
valIdx, slot, slashingSafe = true).valueOr:
continue
asyncSpawn signAndSendContribution(
node, validator, subcommitteeIdx, head, slot)
proc handleProposal(node: BeaconNode, head: BlockRef, slot: Slot):
Future[BlockRef] {.async.} =
## Perform the proposal for the given slot, iff we have a validator attached
## that is supposed to do so, given the shuffling at that slot for the given
## head - to compute the proposer, we need to advance a state to the given
## slot
let
proposer = node.dag.getProposer(head, slot).valueOr:
return head
proposerKey = node.dag.validatorKey(proposer).get().toPubKey
validator = node.getValidatorForDuties(proposer, slot).valueOr:
debug "Expecting block proposal", headRoot = shortLog(head.root),
slot = shortLog(slot),
proposer_index = proposer,
proposer = shortLog(proposerKey)
return head
return await proposeBlock(node, validator, proposer, head, slot)
proc signAndSendAggregate(
node: BeaconNode, validator: AttachedValidator, shufflingRef: ShufflingRef,
slot: Slot, committee_index: CommitteeIndex) {.async.} =
try:
let
fork = node.dag.forkAtEpoch(slot.epoch)
genesis_validators_root = node.dag.genesis_validators_root
validator_index = validator.index.get()
selectionProof = block:
let res = await validator.getSlotSignature(
fork, genesis_validators_root, slot)
if res.isErr():
warn "Unable to create slot signature",
validator = shortLog(validator),
slot, error = res.error()
return
res.get()
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/validator.md#aggregation-selection
if not is_aggregator(
shufflingRef, slot, committee_index, selectionProof):
return
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/validator.md#construct-aggregate
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/validator.md#aggregateandproof
var
msg = SignedAggregateAndProof(
message: AggregateAndProof(
aggregator_index: uint64 validator_index,
selection_proof: selectionProof))
msg.message.aggregate = node.attestationPool[].getAggregatedAttestation(
slot, committee_index).valueOr:
return
msg.signature = block:
let res = await validator.getAggregateAndProofSignature(
fork, genesis_validators_root, msg.message)
if res.isErr():
warn "Unable to sign aggregate",
validator = shortLog(validator), error_msg = res.error()
return
res.get()
validator.doppelgangerActivity(msg.message.aggregate.data.slot.epoch)
# Logged in the router
discard await node.router.routeSignedAggregateAndProof(
msg, checkSignature = false)
except CatchableError as exc:
# An error could happen here when the signature task fails - we must
# not leak the exception because this is an asyncSpawn task
warn "Error sending aggregate", err = exc.msg
proc sendAggregatedAttestations(
node: BeaconNode, head: BlockRef, slot: Slot) {.async.} =
# Aggregated attestations must be sent by members of the beacon committees for
# the given slot, for which `is_aggregator` returns `true`.
let
shufflingRef = node.dag.getShufflingRef(head, slot.epoch, false).valueOr:
warn "Cannot construct EpochRef for head, report bug",
head = shortLog(head), slot
return
committees_per_slot = get_committee_count_per_slot(shufflingRef)
for committee_index in get_committee_indices(committees_per_slot):
for _, validator_index in
get_beacon_committee(shufflingRef, slot, committee_index):
let validator = node.getValidatorForDuties(validator_index, slot).valueOr:
continue
asyncSpawn signAndSendAggregate(node, validator, shufflingRef, slot,
committee_index)
proc updateValidatorMetrics*(node: BeaconNode) =
# Technically, this only needs to be done on epoch transitions and if there's
# a reorg that spans an epoch transition, but it's easier to implement this
# way for now.
# We'll limit labelled metrics to the first 64, so that we don't overload
# Prometheus.
var total: Gwei
var i = 0
for _, v in node.attachedValidators[].validators:
let balance =
if v.index.isNone():
0.Gwei
elif v.index.get().uint64 >=
getStateField(node.dag.headState, balances).lenu64:
debug "Cannot get validator balance, index out of bounds",
pubkey = shortLog(v.pubkey), index = v.index.get(),
balances = getStateField(node.dag.headState, balances).len,
stateRoot = getStateRoot(node.dag.headState)
0.Gwei
else:
getStateField(node.dag.headState, balances).item(v.index.get())
if i < 64:
attached_validator_balance.set(
balance.toGaugeValue, labelValues = [shortLog(v.pubkey)])
inc i
total += balance
node.attachedValidatorBalanceTotal = total
attached_validator_balance_total.set(total.toGaugeValue)
from std/times import epochTime
proc getValidatorRegistration(
node: BeaconNode, validator: AttachedValidator, epoch: Epoch):
Future[Result[SignedValidatorRegistrationV1, string]] {.async.} =
let validatorIdx = validator.index.valueOr:
# The validator index will be missing when the validator was not
# activated for duties yet. We can safely skip the registration then.
return
let feeRecipient = node.getFeeRecipient(validator.pubkey, validatorIdx, epoch)
let gasLimit = node.getGasLimit(validator.pubkey)
var validatorRegistration = SignedValidatorRegistrationV1(
message: ValidatorRegistrationV1(
fee_recipient: ExecutionAddress(data: distinctBase(feeRecipient)),
gas_limit: gasLimit,
timestamp: epochTime().uint64,
pubkey: validator.pubkey))
let signature = await validator.getBuilderSignature(
node.dag.cfg.genesisFork, validatorRegistration.message)
debug "getValidatorRegistration: registering",
validatorRegistration
if signature.isErr:
return err signature.error
validatorRegistration.signature = signature.get
return ok validatorRegistration
proc registerValidators*(node: BeaconNode, epoch: Epoch) {.async.} =
try:
if (not node.config.payloadBuilderEnable) or
node.currentSlot.epoch < node.dag.cfg.BELLATRIX_FORK_EPOCH:
return
const HttpOk = 200
let payloadBuilderClient = node.getPayloadBuilderClient(0).valueOr:
debug "Unable to initialize payload builder client while registering validators",
err = error
return
let restBuilderStatus = awaitWithTimeout(payloadBuilderClient.checkBuilderStatus(),
BUILDER_STATUS_DELAY_TOLERANCE):
debug "Timeout when obtaining builder status"
return
if restBuilderStatus.status != HttpOk:
warn "registerValidators: specified builder or relay not available",
builderUrl = node.config.payloadBuilderUrl,
builderStatus = restBuilderStatus
return
# The async aspect of signing the registrations can cause the attached
# validators to change during the loop.
let attachedValidatorPubkeys =
toSeq(node.attachedValidators[].validators.keys)
const emptyNestedSeq = @[newSeq[SignedValidatorRegistrationV1](0)]
# https://github.com/ethereum/builder-specs/blob/v0.3.0/specs/bellatrix/validator.md#validator-registration
# Seed with single empty inner list to avoid special cases
var validatorRegistrations = emptyNestedSeq
# Some relay networks disallow large request bodies, so split requests
template addValidatorRegistration(
validatorRegistration: SignedValidatorRegistrationV1) =
const registrationValidatorChunkSize = 1000
if validatorRegistrations[^1].len < registrationValidatorChunkSize:
validatorRegistrations[^1].add validatorRegistration
else:
validatorRegistrations.add @[validatorRegistration]
# First, check for VC-added keys; cheaper because provided pre-signed
var nonExitedVcPubkeys: HashSet[ValidatorPubKey]
if node.externalBuilderRegistrations.len > 0:
withState(node.dag.headState):
let currentEpoch = node.currentSlot().epoch
for i in 0 ..< forkyState.data.validators.len:
# https://github.com/ethereum/beacon-APIs/blob/v2.4.0/apis/validator/register_validator.yaml
# "Note that only registrations for active or pending validators must
# be sent to the builder network. Registrations for unknown or exited
# validators must be filtered out and not sent to the builder
# network."
let pubkey = forkyState.data.validators.item(i).pubkey
if pubkey in node.externalBuilderRegistrations and
forkyState.data.validators.item(i).exit_epoch > currentEpoch:
let signedValidatorRegistration =
node.externalBuilderRegistrations[pubkey]
nonExitedVcPubkeys.incl signedValidatorRegistration.message.pubkey
addValidatorRegistration signedValidatorRegistration
for key in attachedValidatorPubkeys:
# Already included from VC
if key in nonExitedVcPubkeys:
warn "registerValidators: same validator registered by beacon node and validator client",
pubkey = shortLog(key)
continue
# Time passed during awaits; REST keymanager API might have removed it
if key notin node.attachedValidators[].validators:
continue
let validator = node.attachedValidators[].validators[key]
if validator.index.isNone:
continue
# https://github.com/ethereum/builder-specs/blob/v0.3.0/apis/builder/validators.yaml
# Builders should verify that `pubkey` corresponds to an active or
# pending validator
withState(node.dag.headState):
if distinctBase(validator.index.get) >=
forkyState.data.validators.lenu64:
continue
if node.currentSlot().epoch >=
forkyState.data.validators.item(validator.index.get).exit_epoch:
continue
if validator.externalBuilderRegistration.isSome:
addValidatorRegistration validator.externalBuilderRegistration.get
else:
let validatorRegistration =
await node.getValidatorRegistration(validator, epoch)
if validatorRegistration.isErr:
error "registerValidators: validatorRegistration failed",
validatorRegistration
continue
# Time passed during await; REST keymanager API might have removed it
if key notin node.attachedValidators[].validators:
continue
node.attachedValidators[].validators[key].externalBuilderRegistration =
Opt.some validatorRegistration.get
addValidatorRegistration validatorRegistration.get
if validatorRegistrations == emptyNestedSeq:
return
# TODO if there are too many chunks, could trigger DoS protections, so
# might randomize order to accumulate cumulative coverage
for chunkIdx in 0 ..< validatorRegistrations.len:
let registerValidatorResult =
awaitWithTimeout(
payloadBuilderClient.registerValidator(
validatorRegistrations[chunkIdx]),
BUILDER_VALIDATOR_REGISTRATION_DELAY_TOLERANCE):
error "Timeout when registering validator with builder"
continue # Try next batch regardless
if HttpOk != registerValidatorResult.status:
warn "registerValidators: Couldn't register validator with MEV builder",
registerValidatorResult
except CatchableError as exc:
warn "registerValidators: exception",
error = exc.msg
proc updateValidators(
node: BeaconNode, validators: openArray[Validator]) =
# Since validator indicies are stable, we only check the "updated" range -
# checking all validators would significantly slow down this loop when there
# are many inactive keys
for i in node.dutyValidatorCount..validators.high:
let
v = node.attachedValidators[].getValidator(validators[i].pubkey).valueOr:
continue
v.index = Opt.some ValidatorIndex(i)
node.dutyValidatorCount = validators.len
for validator in node.attachedValidators[]:
# Check if any validators have been activated
if validator.needsUpdate and validator.index.isSome():
# Activation epoch can change after index is assigned..
let index = validator.index.get()
if index < validators.lenu64:
validator.updateValidator(
Opt.some(ValidatorAndIndex(
index: index, validator: validators[int index]
)))
proc handleValidatorDuties*(node: BeaconNode, lastSlot, slot: Slot) {.async.} =
## Perform validator duties - create blocks, vote and aggregate existing votes
if node.attachedValidators[].count == 0:
# Nothing to do because we have no validator attached
return
# The dag head might be updated by sync while we're working due to the
# await calls, thus we use a local variable to keep the logic straight here
var head = node.dag.head
if not node.isSynced(head):
info "Beacon node not in sync; skipping validator duties for now",
slot, headSlot = head.slot
# Rewards will be growing though, as we sync..
updateValidatorMetrics(node)
return
elif not head.executionValid:
info "Execution client not in sync; skipping validator duties for now",
slot, headSlot = head.slot
# Rewards will be growing though, as we sync..
updateValidatorMetrics(node)
return
else:
discard # keep going
withState(node.dag.headState):
node.updateValidators(forkyState.data.validators.asSeq())
var curSlot = lastSlot + 1
# Start by checking if there's work we should have done in the past that we
# can still meaningfully do
while curSlot < slot:
notice "Catching up on validator duties",
curSlot = shortLog(curSlot),
lastSlot = shortLog(lastSlot),
slot = shortLog(slot)
# For every slot we're catching up, we'll propose then send
# attestations - head should normally be advancing along the same branch
# in this case
head = await handleProposal(node, head, curSlot)
# For each slot we missed, we need to send out attestations - if we were
# proposing during this time, we'll use the newly proposed head, else just
# keep reusing the same - the attestation that goes out will actually
# rewind the state to what it looked like at the time of that slot
handleAttestations(node, head, curSlot)
curSlot += 1
let
newHead = await handleProposal(node, head, slot)
didSubmitBlock = (newHead != head)
head = newHead
let
# The latest point in time when we'll be sending out attestations
attestationCutoff = node.beaconClock.fromNow(slot.attestation_deadline())
if attestationCutoff.inFuture:
debug "Waiting to send attestations",
head = shortLog(head),
attestationCutoff = shortLog(attestationCutoff.offset)
# Wait either for the block or the attestation cutoff time to arrive
if await node.consensusManager[].expectBlock(slot)
.withTimeout(attestationCutoff.offset):
await waitAfterBlockCutoff(node.beaconClock, slot, Opt.some(head))
# Time passed - we might need to select a new head in that case
node.consensusManager[].updateHead(slot)
head = node.dag.head
static: doAssert attestationSlotOffset == syncCommitteeMessageSlotOffset
handleAttestations(node, head, slot)
handleSyncCommitteeMessages(node, head, slot)
updateValidatorMetrics(node) # the important stuff is done, update the vanity numbers
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/validator.md#broadcast-aggregate
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#broadcast-sync-committee-contribution
# Wait 2 / 3 of the slot time to allow messages to propagate, then collect
# the result in aggregates
static:
doAssert aggregateSlotOffset == syncContributionSlotOffset, "Timing change?"
let
aggregateCutoff = node.beaconClock.fromNow(slot.aggregate_deadline())
if aggregateCutoff.inFuture:
debug "Waiting to send aggregate attestations",
aggregateCutoff = shortLog(aggregateCutoff.offset)
await sleepAsync(aggregateCutoff.offset)
let sendAggregatedAttestationsFut =
sendAggregatedAttestations(node, head, slot)
let handleSyncCommitteeContributionsFut =
handleSyncCommitteeContributions(node, head, slot)
await handleSyncCommitteeContributionsFut
await sendAggregatedAttestationsFut
proc registerDuties*(node: BeaconNode, wallSlot: Slot) {.async.} =
## Register upcoming duties of attached validators with the duty tracker
if node.attachedValidators[].count() == 0 or
not node.isSynced(node.dag.head) or not node.dag.head.executionValid:
# Nothing to do because we have no validator attached
return
let
genesis_validators_root = node.dag.genesis_validators_root
head = node.dag.head
# Getting the slot signature is expensive but cached - in "normal" cases we'll
# be getting the duties one slot at a time
for slot in wallSlot ..< wallSlot + SUBNET_SUBSCRIPTION_LEAD_TIME_SLOTS:
let
shufflingRef = node.dag.getShufflingRef(head, slot.epoch, false).valueOr:
warn "Cannot construct EpochRef for duties - report bug",
head = shortLog(head), slot
return
let
fork = node.dag.forkAtEpoch(slot.epoch)
committees_per_slot = get_committee_count_per_slot(shufflingRef)
for committee_index in get_committee_indices(committees_per_slot):
let committee = get_beacon_committee(shufflingRef, slot, committee_index)
for index_in_committee, validator_index in committee:
let
validator = node.getValidator(validator_index).valueOr:
continue
subnet_id = compute_subnet_for_attestation(
committees_per_slot, slot, committee_index)
slotSigRes = await validator.getSlotSignature(
fork, genesis_validators_root, slot)
if slotSigRes.isErr():
error "Unable to create slot signature",
validator = shortLog(validator),
error_msg = slotSigRes.error()
continue
let isAggregator = is_aggregator(committee.lenu64, slotSigRes.get())
node.consensusManager[].actionTracker.registerDuty(
slot, subnet_id, validator_index, isAggregator)