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# beacon_chain
# Copyright (c) 2018-2024 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: [].}
import
std/tables,
chronicles, chronos, metrics,
taskpools,
../spec/[helpers, forks],
../consensus_object_pools/[
blob_quarantine, block_clearance, block_quarantine, blockchain_dag,
attestation_pool, light_client_pool, sync_committee_msg_pool,
validator_change_pool],
../validators/validator_pool,
../beacon_clock,
"."/[gossip_validation, block_processor, batch_validation],
../nimbus_binary_common
export
results, taskpools, block_clearance, blockchain_dag, attestation_pool,
light_client_pool, sync_committee_msg_pool, validator_change_pool,
validator_pool, beacon_clock, gossip_validation, block_processor,
batch_validation, block_quarantine
logScope: topics = "gossip_eth2"
# Metrics for tracking attestation and beacon block loss
declareCounter beacon_attestations_received,
"Number of valid unaggregated attestations processed by this node"
declareCounter beacon_attestations_dropped,
"Number of invalid unaggregated attestations dropped by this node", labels = ["reason"]
declareCounter beacon_aggregates_received,
"Number of valid aggregated attestations processed by this node"
declareCounter beacon_aggregates_dropped,
"Number of invalid aggregated attestations dropped by this node", labels = ["reason"]
declareCounter beacon_blocks_received,
"Number of valid blocks processed by this node"
declareCounter beacon_blocks_dropped,
"Number of invalid blocks dropped by this node", labels = ["reason"]
declareCounter blob_sidecars_received,
"Number of valid blobs processed by this node"
declareCounter blob_sidecars_dropped,
"Number of invalid blobs dropped by this node", labels = ["reason"]
declareCounter beacon_attester_slashings_received,
"Number of valid attester slashings processed by this node"
declareCounter beacon_attester_slashings_dropped,
"Number of invalid attester slashings dropped by this node", labels = ["reason"]
declareCounter beacon_proposer_slashings_received,
"Number of valid proposer slashings processed by this node"
declareCounter beacon_proposer_slashings_dropped,
"Number of invalid proposer slashings dropped by this node", labels = ["reason"]
declareCounter beacon_voluntary_exits_received,
"Number of valid voluntary exits processed by this node"
declareCounter beacon_voluntary_exits_dropped,
"Number of invalid voluntary exits dropped by this node", labels = ["reason"]
declareCounter beacon_sync_committee_messages_received,
"Number of valid sync committee messages processed by this node"
declareCounter beacon_sync_committee_messages_dropped,
"Number of invalid sync committee messages dropped by this node", labels = ["reason"]
declareCounter beacon_sync_committee_contributions_received,
"Number of valid sync committee contributions processed by this node"
declareCounter beacon_sync_committee_contributions_dropped,
"Number of invalid sync committee contributions dropped by this node", labels = ["reason"]
declareCounter beacon_light_client_finality_update_received,
"Number of valid light client finality update processed by this node"
declareCounter beacon_light_client_finality_update_dropped,
"Number of invalid light client finality update dropped by this node", labels = ["reason"]
declareCounter beacon_light_client_optimistic_update_received,
"Number of valid light client optimistic update processed by this node"
declareCounter beacon_light_client_optimistic_update_dropped,
"Number of invalid light client optimistic update dropped by this node", labels = ["reason"]
const delayBuckets = [2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, Inf]
declareHistogram beacon_attestation_delay,
"Time(s) between slot start and attestation reception", buckets = delayBuckets
declareHistogram beacon_aggregate_delay,
"Time(s) between slot start and aggregate reception", buckets = delayBuckets
declareHistogram beacon_block_delay,
"Time(s) between slot start and beacon block reception", buckets = delayBuckets
declareHistogram blob_sidecar_delay,
"Time(s) between slot start and blob sidecar reception", buckets = delayBuckets
type
DoppelgangerProtection = object
broadcastStartEpoch*: Epoch ##\
## Set anew, each time gossip is re-enabled after syncing completes, so
## might reset multiple times per instance. This allows some safe level
## of gossip interleaving between nodes so long as they don't gossip at
## the same time.
Eth2Processor* = object
## The Eth2Processor is the entry point for untrusted message processing -
## when we receive messages from various sources, we pass them to the
## processor for validation and routing - the messages are generally
## validated, and if valid, passed on to the various pools, monitors and
## managers to update the state of the application.
##
## Block processing is special in that part of it is done in the
## `BlockProcessor` instead, via a special block processing queue.
##
## Each validating function generally will do a sanity check on the message
## whose purpose is to quickly filter out spam, then will (usually) delegate
## full validation to the proper manager - finally, metrics and monitoring
## are updated.
doppelgangerDetectionEnabled*: bool
# Local sources of truth for validation
# ----------------------------------------------------------------
dag*: ChainDAGRef
attestationPool*: ref AttestationPool
validatorPool*: ref ValidatorPool
syncCommitteeMsgPool: ref SyncCommitteeMsgPool
lightClientPool: ref LightClientPool
doppelgangerDetection*: DoppelgangerProtection
# Gossip validated -> enqueue for further verification
# ----------------------------------------------------------------
blockProcessor*: ref BlockProcessor
# Validator monitoring
validatorMonitor: ref ValidatorMonitor
# Validated with no further verification required
# ----------------------------------------------------------------
validatorChangePool: ref ValidatorChangePool
# Almost validated, pending cryptographic signature check
# ----------------------------------------------------------------
batchCrypto*: ref BatchCrypto
# Missing information
# ----------------------------------------------------------------
quarantine*: ref Quarantine
blobQuarantine*: ref BlobQuarantine
# Application-provided current time provider (to facilitate testing)
getCurrentBeaconTime*: GetBeaconTimeFn
ValidationRes* = Result[void, ValidationError]
func toValidationResult*(res: ValidationRes): ValidationResult =
if res.isOk(): ValidationResult.Accept else: res.error()[0]
# Initialization
# ------------------------------------------------------------------------------
proc new*(T: type Eth2Processor,
doppelgangerDetectionEnabled: bool,
blockProcessor: ref BlockProcessor,
validatorMonitor: ref ValidatorMonitor,
dag: ChainDAGRef,
attestationPool: ref AttestationPool,
validatorChangePool: ref ValidatorChangePool,
validatorPool: ref ValidatorPool,
syncCommitteeMsgPool: ref SyncCommitteeMsgPool,
lightClientPool: ref LightClientPool,
quarantine: ref Quarantine,
blobQuarantine: ref BlobQuarantine,
rng: ref HmacDrbgContext,
getBeaconTime: GetBeaconTimeFn,
taskpool: Taskpool
): ref Eth2Processor =
(ref Eth2Processor)(
doppelgangerDetectionEnabled: doppelgangerDetectionEnabled,
doppelgangerDetection: DoppelgangerProtection(
broadcastStartEpoch: FAR_FUTURE_EPOCH),
blockProcessor: blockProcessor,
validatorMonitor: validatorMonitor,
dag: dag,
attestationPool: attestationPool,
validatorChangePool: validatorChangePool,
validatorPool: validatorPool,
syncCommitteeMsgPool: syncCommitteeMsgPool,
lightClientPool: lightClientPool,
quarantine: quarantine,
blobQuarantine: blobQuarantine,
getCurrentBeaconTime: getBeaconTime,
batchCrypto: BatchCrypto.new(
rng = rng,
# Only run eager attestation signature verification if we're not
# processing blocks in order to give priority to block processing
eager = proc(): bool = not blockProcessor[].hasBlocks(),
genesis_validators_root = dag.genesis_validators_root, taskpool).expect(
"working batcher")
)
# Each validator logs, validates then passes valid data to its destination
# further down the line - in particular, validation should generally not have
# any side effects until the message is fully validated, or invalid messages
# could be used to push out valid messages.
proc processSignedBeaconBlock*(
self: var Eth2Processor, src: MsgSource,
signedBlock: ForkySignedBeaconBlock,
maybeFinalized: bool = false): ValidationRes =
let
wallTime = self.getCurrentBeaconTime()
(afterGenesis, wallSlot) = wallTime.toSlot()
logScope:
blockRoot = shortLog(signedBlock.root)
blck = shortLog(signedBlock.message)
signature = shortLog(signedBlock.signature)
wallSlot
if not afterGenesis:
notice "Block before genesis"
return errIgnore("Block before genesis")
# Potential under/overflows are fine; would just create odd metrics and logs
let delay = wallTime - signedBlock.message.slot.start_beacon_time
# Start of block processing - in reality, we have already gone through SSZ
# decoding at this stage, which may be significant
debug "Block received", delay
let v =
self.dag.validateBeaconBlock(self.quarantine, signedBlock, wallTime, {})
if v.isOk():
# Block passed validation - enqueue it for processing. The block processing
# queue is effectively unbounded as we use a freestanding task to enqueue
# the block - this is done so that when blocks arrive concurrently with
# sync, we don't lose the gossip blocks, but also don't block the gossip
# propagation of seemingly good blocks
trace "Block validated"
let blobs =
when typeof(signedBlock).kind >= ConsensusFork.Deneb:
if self.blobQuarantine[].hasBlobs(signedBlock):
Opt.some(self.blobQuarantine[].popBlobs(signedBlock.root, signedBlock))
else:
discard self.quarantine[].addBlobless(self.dag.finalizedHead.slot,
signedBlock)
return v
else:
Opt.none(BlobSidecars)
self.blockProcessor[].enqueueBlock(
src, ForkedSignedBeaconBlock.init(signedBlock),
blobs,
maybeFinalized = maybeFinalized,
validationDur = nanoseconds(
(self.getCurrentBeaconTime() - wallTime).nanoseconds))
# Validator monitor registration for blocks is done by the processor
beacon_blocks_received.inc()
beacon_block_delay.observe(delay.toFloatSeconds())
else:
debug "Dropping block", error = v.error()
self.blockProcessor[].dumpInvalidBlock(signedBlock)
beacon_blocks_dropped.inc(1, [$v.error[0]])
v
proc processBlobSidecar*(
self: var Eth2Processor, src: MsgSource,
blobSidecar: deneb.BlobSidecar, subnet_id: BlobId): ValidationRes =
template block_header: untyped = blobSidecar.signed_block_header.message
let
wallTime = self.getCurrentBeaconTime()
(_, wallSlot) = wallTime.toSlot()
logScope:
blob = shortLog(blobSidecar)
wallSlot
# Potential under/overflows are fine; would just create odd metrics and logs
let delay = wallTime - block_header.slot.start_beacon_time
debug "Blob received", delay
let v =
self.dag.validateBlobSidecar(self.quarantine, self.blobQuarantine,
blobSidecar, wallTime, subnet_id)
if v.isErr():
debug "Dropping blob", error = v.error()
blob_sidecars_dropped.inc(1, [$v.error[0]])
return v
debug "Blob validated, putting in blob quarantine"
self.blobQuarantine[].put(newClone(blobSidecar))
let block_root = hash_tree_root(block_header)
if (let o = self.quarantine[].popBlobless(block_root); o.isSome):
let blobless = o.unsafeGet()
withBlck(blobless):
when consensusFork >= ConsensusFork.Deneb:
if self.blobQuarantine[].hasBlobs(forkyBlck):
self.blockProcessor[].enqueueBlock(
MsgSource.gossip, blobless,
Opt.some(self.blobQuarantine[].popBlobs(block_root, forkyBlck)))
else:
discard self.quarantine[].addBlobless(
self.dag.finalizedHead.slot, forkyBlck)
else:
raiseAssert "Could not have been added as blobless"
blob_sidecars_received.inc()
blob_sidecar_delay.observe(delay.toFloatSeconds())
v
proc setupDoppelgangerDetection*(self: var Eth2Processor, slot: Slot) =
# When another client's already running, this is very likely to detect
# potential duplicate validators, which can trigger slashing.
#
# Every missed attestation costs approximately 3*get_base_reward(), which
# can be up to around 10,000 Wei. Thus, skipping attestations isn't cheap
# and one should gauge the likelihood of this simultaneous launch to tune
# the epoch delay to one's perceived risk.
# Round up to ensure that we cover the entire epoch - used by rest api also
self.doppelgangerDetection.broadcastStartEpoch =
(slot + SLOTS_PER_EPOCH - 1).epoch
if self.doppelgangerDetectionEnabled:
notice "Setting up doppelganger detection",
epoch = slot.epoch,
broadcast_epoch = self.doppelgangerDetection.broadcastStartEpoch
func clearDoppelgangerProtection*(self: var Eth2Processor) =
self.doppelgangerDetection.broadcastStartEpoch = FAR_FUTURE_EPOCH
proc checkForPotentialDoppelganger(
self: var Eth2Processor,
attestation: phase0.Attestation | electra.Attestation,
attesterIndices: openArray[ValidatorIndex]) =
# Only check for attestations after node launch. There might be one slot of
# overlap in quick intra-slot restarts so trade off a few true negatives in
# the service of avoiding more likely false positives.
if not self.doppelgangerDetectionEnabled:
return
for validatorIndex in attesterIndices:
let
pubkey = self.dag.validatorKey(validatorIndex).get().toPubKey()
if self.validatorPool[].triggersDoppelganger(
pubkey, attestation.data.slot.epoch):
warn "Doppelganger attestation",
validator = shortLog(pubkey),
validator_index = validatorIndex,
attestation = shortLog(attestation)
quitDoppelganger()
proc processAttestation*(
self: ref Eth2Processor, src: MsgSource,
attestation: phase0.Attestation | electra.Attestation, subnet_id: SubnetId,
checkSignature, checkValidator: bool
): Future[ValidationRes] {.async: (raises: [CancelledError]).} =
var wallTime = self.getCurrentBeaconTime()
let (afterGenesis, wallSlot) = wallTime.toSlot()
logScope:
attestation = shortLog(attestation)
subnet_id
wallSlot
if not afterGenesis:
notice "Attestation before genesis"
return errIgnore("Attestation before genesis")
# Potential under/overflows are fine; would just create odd metrics and logs
let delay = wallTime - attestation.data.slot.attestation_deadline
debug "Attestation received", delay
# Now proceed to validation
let v =
await self.attestationPool.validateAttestation(
self.batchCrypto, attestation, wallTime, subnet_id, checkSignature)
return if v.isOk():
# Due to async validation the wallTime here might have changed
wallTime = self.getCurrentBeaconTime()
let (attester_index, sig) = v.get()
if checkValidator and (attester_index in self.validatorPool[]):
warn "A validator client has attempted to send an attestation from " &
"validator that is also managed by the beacon node",
validator_index = attester_index
errReject("An attestation could not be sent from a validator that is " &
"also managed by the beacon node")
else:
self[].checkForPotentialDoppelganger(attestation, [attester_index])
trace "Attestation validated"
self.attestationPool[].addAttestation(
attestation, [attester_index], sig, wallTime)
self.validatorMonitor[].registerAttestation(
src, wallTime, attestation, attester_index)
beacon_attestations_received.inc()
beacon_attestation_delay.observe(delay.toFloatSeconds())
ok()
else:
debug "Dropping attestation", reason = $v.error
beacon_attestations_dropped.inc(1, [$v.error[0]])
err(v.error())
proc processSignedAggregateAndProof*(
self: ref Eth2Processor, src: MsgSource,
signedAggregateAndProof:
phase0.SignedAggregateAndProof | electra.SignedAggregateAndProof,
checkSignature = true, checkCover = true): Future[ValidationRes]
{.async: (raises: [CancelledError]).} =
var wallTime = self.getCurrentBeaconTime()
let (afterGenesis, wallSlot) = wallTime.toSlot()
logScope:
aggregate = shortLog(signedAggregateAndProof.message.aggregate)
aggregator_index = signedAggregateAndProof.message.aggregator_index
selection_proof = shortLog(signedAggregateAndProof.message.selection_proof)
signature = shortLog(signedAggregateAndProof.signature)
wallSlot
if not afterGenesis:
notice "Aggregate before genesis"
return errIgnore("Aggregate before genesis")
# Potential under/overflows are fine; would just create odd logs
let
slot = signedAggregateAndProof.message.aggregate.data.slot
delay = wallTime - slot.aggregate_deadline
debug "Aggregate received", delay
let v =
await self.attestationPool.validateAggregate(
self.batchCrypto, signedAggregateAndProof, wallTime,
checkSignature = checkSignature, checkCover = checkCover)
return if v.isOk():
# Due to async validation the wallTime here might have changed
wallTime = self.getCurrentBeaconTime()
let (attesting_indices, sig) = v.get()
self[].checkForPotentialDoppelganger(
signedAggregateAndProof.message.aggregate, attesting_indices)
trace "Aggregate validated"
self.attestationPool[].addAttestation(
signedAggregateAndProof.message.aggregate, attesting_indices, sig,
wallTime)
self.validatorMonitor[].registerAggregate(
src, wallTime, signedAggregateAndProof.message, attesting_indices)
beacon_aggregates_received.inc()
beacon_aggregate_delay.observe(delay.toFloatSeconds())
ok()
else:
debug "Dropping aggregate", reason = $v.error
beacon_aggregates_dropped.inc(1, [$v.error[0]])
err(v.error())
proc processBlsToExecutionChange*(
self: ref Eth2Processor, src: MsgSource,
blsToExecutionChange: SignedBLSToExecutionChange):
Future[ValidationRes] {.async: (raises: [CancelledError]).} =
logScope:
blsToExecutionChange = shortLog(blsToExecutionChange)
debug "BLS to execution change received"
let v = await self.validatorChangePool[].validateBlsToExecutionChange(
self.batchCrypto, blsToExecutionChange,
self.getCurrentBeaconTime().slotOrZero.epoch)
if v.isOk():
trace "BLS to execution change validated"
# Prioritize API-provided messages
self.validatorChangePool[].addMessage(
blsToExecutionChange, src == MsgSource.api)
else:
debug "Dropping BLS to execution change", reason = $v.error
beacon_attester_slashings_dropped.inc(1, [$v.error[0]])
return v
proc processAttesterSlashing*(
self: var Eth2Processor, src: MsgSource,
attesterSlashing: phase0.AttesterSlashing | electra.AttesterSlashing):
ValidationRes =
logScope:
attesterSlashing = shortLog(attesterSlashing)
debug "Attester slashing received"
let v = self.validatorChangePool[].validateAttesterSlashing(attesterSlashing)
if v.isOk():
trace "Attester slashing validated"
self.validatorChangePool[].addMessage(attesterSlashing)
self.validatorMonitor[].registerAttesterSlashing(src, attesterSlashing)
beacon_attester_slashings_received.inc()
else:
debug "Dropping attester slashing", reason = $v.error
beacon_attester_slashings_dropped.inc(1, [$v.error[0]])
v
proc processProposerSlashing*(
self: var Eth2Processor, src: MsgSource,
proposerSlashing: ProposerSlashing): Result[void, ValidationError] =
logScope:
proposerSlashing = shortLog(proposerSlashing)
debug "Proposer slashing received"
let v = self.validatorChangePool[].validateProposerSlashing(proposerSlashing)
if v.isOk():
trace "Proposer slashing validated"
self.validatorChangePool[].addMessage(proposerSlashing)
self.validatorMonitor[].registerProposerSlashing(src, proposerSlashing)
beacon_proposer_slashings_received.inc()
else:
debug "Dropping proposer slashing", reason = $v.error
beacon_proposer_slashings_dropped.inc(1, [$v.error[0]])
v
proc processSignedVoluntaryExit*(
self: var Eth2Processor, src: MsgSource,
signedVoluntaryExit: SignedVoluntaryExit): Result[void, ValidationError] =
logScope:
signedVoluntaryExit = shortLog(signedVoluntaryExit)
debug "Voluntary exit received"
let v = self.validatorChangePool[].validateVoluntaryExit(signedVoluntaryExit)
if v.isOk():
trace "Voluntary exit validated"
self.validatorChangePool[].addMessage(signedVoluntaryExit)
self.validatorMonitor[].registerVoluntaryExit(
src, signedVoluntaryExit.message)
beacon_voluntary_exits_received.inc()
else:
debug "Dropping voluntary exit", reason = $v.error
beacon_voluntary_exits_dropped.inc(1, [$v.error[0]])
v
proc processSyncCommitteeMessage*(
self: ref Eth2Processor, src: MsgSource,
syncCommitteeMsg: SyncCommitteeMessage,
subcommitteeIdx: SyncSubcommitteeIndex,
checkSignature: bool = true): Future[Result[void, ValidationError]] {.async: (raises: [CancelledError]).} =
let
wallTime = self.getCurrentBeaconTime()
wallSlot = wallTime.slotOrZero()
logScope:
syncCommitteeMsg = shortLog(syncCommitteeMsg)
subcommitteeIdx
wallSlot
# Potential under/overflows are fine; would just create odd metrics and logs
let delay = wallTime - syncCommitteeMsg.slot.sync_committee_message_deadline
debug "Sync committee message received", delay
# Now proceed to validation
let v = await validateSyncCommitteeMessage(
self.dag, self.quarantine, self.batchCrypto, self.syncCommitteeMsgPool,
syncCommitteeMsg, subcommitteeIdx, wallTime, checkSignature)
return if v.isOk():
trace "Sync committee message validated"
let (bid, cookedSig, positions) = v.get()
self.syncCommitteeMsgPool[].addSyncCommitteeMessage(
syncCommitteeMsg.slot,
bid,
syncCommitteeMsg.validator_index,
cookedSig,
subcommitteeIdx,
positions)
self.validatorMonitor[].registerSyncCommitteeMessage(
src, wallTime, syncCommitteeMsg)
beacon_sync_committee_messages_received.inc()
ok()
else:
debug "Dropping sync committee message", reason = $v.error
beacon_sync_committee_messages_dropped.inc(1, [$v.error[0]])
err(v.error())
proc processSignedContributionAndProof*(
self: ref Eth2Processor, src: MsgSource,
contributionAndProof: SignedContributionAndProof,
checkSignature: bool = true):
Future[Result[void, ValidationError]] {.async: (raises: [CancelledError]).} =
let
wallTime = self.getCurrentBeaconTime()
wallSlot = wallTime.slotOrZero()
logScope:
contribution = shortLog(contributionAndProof.message.contribution)
signature = shortLog(contributionAndProof.signature)
aggregator_index = contributionAndProof.message.aggregator_index
selection_proof = contributionAndProof.message.selection_proof
wallSlot
# Potential under/overflows are fine; would just create odd metrics and logs
let
slot = contributionAndProof.message.contribution.slot
delay = wallTime - slot.sync_contribution_deadline
debug "Contribution received", delay
# Now proceed to validation
let v = await validateContribution(
self.dag, self.quarantine, self.batchCrypto, self.syncCommitteeMsgPool,
contributionAndProof, wallTime, checkSignature)
return if v.isOk():
trace "Contribution validated"
let (bid, sig, participants) = v.get
self.syncCommitteeMsgPool[].addContribution(
contributionAndProof, bid, sig)
self.validatorMonitor[].registerSyncContribution(
src, wallTime, contributionAndProof.message, participants)
beacon_sync_committee_contributions_received.inc()
ok()
else:
debug "Dropping contribution", reason = $v.error
beacon_sync_committee_contributions_dropped.inc(1, [$v.error[0]])
err(v.error())
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
proc processLightClientFinalityUpdate*(
self: var Eth2Processor, src: MsgSource,
finality_update: ForkedLightClientFinalityUpdate
): Result[void, ValidationError] =
let
wallTime = self.getCurrentBeaconTime()
v = validateLightClientFinalityUpdate(
self.lightClientPool[], self.dag, finality_update, wallTime)
if v.isOk():
beacon_light_client_finality_update_received.inc()
else:
beacon_light_client_finality_update_dropped.inc(1, [$v.error[0]])
v
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/altair/light-client/sync-protocol.md#process_light_client_optimistic_update
proc processLightClientOptimisticUpdate*(
self: var Eth2Processor, src: MsgSource,
optimistic_update: ForkedLightClientOptimisticUpdate
): Result[void, ValidationError] =
let
wallTime = self.getCurrentBeaconTime()
v = validateLightClientOptimisticUpdate(
self.lightClientPool[], self.dag, optimistic_update, wallTime)
if v.isOk():
beacon_light_client_optimistic_update_received.inc()
else:
beacon_light_client_optimistic_update_dropped.inc(1, [$v.error[0]])
v
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