make subnet cycling more robust; use one stability subnet/validator; explicitly represent gossip enabled/disabled (#2201)
* make subnet cycling more robust; use one stability subnet/validator; explicitly represent gossip enabled/disabled * fix asymmetry in _snappy being used for subscriptions but not unsubscriptions * remove redundant comment * minimal RPC and VC support for infoming BN of subnets * create and verify slot signatures in RPC interface and VC * loosen old slot check * because Slot + uint64 works but uint64 + Slot doesn't * document assumptions for head state use; don't clear stability subnets; guard against VC not having checked an epoch ahead, fixing a crash; clarify unsigned comparison * revert unsub fix
This commit is contained in:
tersec
GitHub
parent
be74df70e0
commit
afbaa36ef7
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@ -359,11 +359,12 @@ proc installAttestationSubnetHandlers(node: BeaconNode, subnets: set[uint8])
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await allFutures(attestationSubscriptions)
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proc updateStabilitySubnetMetadata(node: BeaconNode, stabilitySubnet: uint64) =
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proc updateStabilitySubnetMetadata(
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node: BeaconNode, stabilitySubnets: set[uint8]) =
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# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0/specs/phase0/p2p-interface.md#metadata
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node.network.metadata.seq_number += 1
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for subnet in 0'u8 ..< ATTESTATION_SUBNET_COUNT:
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node.network.metadata.attnets[subnet] = (subnet == stabilitySubnet)
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node.network.metadata.attnets[subnet] = (subnet in stabilitySubnets)
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# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0/specs/phase0/validator.md#phase-0-attestation-subnet-stability
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# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0/specs/phase0/p2p-interface.md#attestation-subnet-bitfield
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@ -374,12 +375,38 @@ proc updateStabilitySubnetMetadata(node: BeaconNode, stabilitySubnet: uint64) =
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# be the correct one and the ENR will not increase in size.
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warn "Failed to update record on subnet cycle", error = res.error
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else:
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debug "Stability subnet changed, updated ENR attnets", stabilitySubnet
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debug "Stability subnets changed; updated ENR attnets", stabilitySubnets
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proc cycleAttestationSubnets(node: BeaconNode, slot: Slot) {.async.} =
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func getStabilitySubnets(stabilitySubnets: auto): set[uint8] =
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for subnetInfo in stabilitySubnets:
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result.incl subnetInfo.subnet
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proc cycleAttestationSubnets(node: BeaconNode, wallSlot: Slot) {.async.} =
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static: doAssert RANDOM_SUBNETS_PER_VALIDATOR == 1
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let epochParity = slot.epoch mod 2
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# Only know RANDAO mix, which determines shuffling seed, one epoch in
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# advance. When node.chainDag.headState.data.data.slot.epoch is ahead
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# of wallSlot, the clock's just incorrect. If the state slot's behind
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# wallSlot, it would have to look more than MIN_SEED_LOOKAHEAD epochs
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# ahead to compute the shuffling determining the beacon committees.
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if node.chainDag.headState.data.data.slot.epoch != wallSlot.epoch:
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debug "Requested attestation subnets too far in advance",
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wallSlot,
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stateSlot = node.chainDag.headState.data.data.slot
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return
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if node.attestationSubnets.nextCycleEpoch > wallSlot.epoch:
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return
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node.attestationSubnets.nextCycleEpoch = wallSlot.epoch + 1
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# This works so long as at least one block in an epoch provides a basis for
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# calculating the shuffling for the next epoch. It will keep checking for a
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# block, each slot, until a block comes in, even if the first few blocks in
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# an epoch are missing. If a whole epoch without blocks occurs, it's not as
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# important to attest regardless, as those upcoming blocks will hit maximum
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# attestations quickly and any individual attestation's likelihood of being
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# selected is low.
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let epochParity = wallSlot.epoch mod 2
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var attachedValidators: seq[ValidatorIndex]
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for validatorIndex in 0 ..< node.chainDag.headState.data.data.validators.len:
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if node.getAttachedValidator(
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@ -392,9 +419,10 @@ proc cycleAttestationSubnets(node: BeaconNode, slot: Slot) {.async.} =
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let (newAttestationSubnets, expiringSubnets, newSubnets) =
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get_attestation_subnet_changes(
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node.chainDag.headState.data.data, attachedValidators,
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node.attestationSubnets, slot.epoch)
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node.attestationSubnets)
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let prevStabilitySubnet = node.attestationSubnets.stabilitySubnet
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let prevStabilitySubnets =
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getStabilitySubnets(node.attestationSubnets.stabilitySubnets)
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node.attestationSubnets = newAttestationSubnets
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debug "Attestation subnets",
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@ -403,9 +431,8 @@ proc cycleAttestationSubnets(node: BeaconNode, slot: Slot) {.async.} =
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node.attestationSubnets.subscribedSubnets[1 - epochParity],
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upcoming_subnets = node.attestationSubnets.subscribedSubnets[epochParity],
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new_subnets = newSubnets,
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stability_subnet = node.attestationSubnets.stabilitySubnet,
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stability_subnet_expiration_epoch =
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node.attestationSubnets.stabilitySubnetExpirationEpoch
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epoch = wallSlot.epoch,
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num_stability_subnets = node.attestationSubnets.stabilitySubnets.len
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block:
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var unsubscriptions: seq[Future[void]] = @[]
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@ -417,9 +444,10 @@ proc cycleAttestationSubnets(node: BeaconNode, slot: Slot) {.async.} =
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await node.installAttestationSubnetHandlers(newSubnets)
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let stabilitySubnet = node.attestationSubnets.stabilitySubnet
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if stabilitySubnet != prevStabilitySubnet:
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node.updateStabilitySubnetMetadata(stabilitySubnet)
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let stabilitySubnets =
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getStabilitySubnets(node.attestationSubnets.stabilitySubnets)
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if stabilitySubnets != prevStabilitySubnets:
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node.updateStabilitySubnetMetadata(stabilitySubnets)
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proc getAttestationSubnetHandlers(node: BeaconNode): Future[void] =
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var initialSubnets: set[uint8]
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@ -432,17 +460,27 @@ proc getAttestationSubnetHandlers(node: BeaconNode): Future[void] =
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# - Restarting the node with a presistent netkey
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# - When going from synced -> syncing -> synced state
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let wallEpoch = node.beaconClock.now().slotOrZero().epoch
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node.attestationSubnets.stabilitySubnet = rand(ATTESTATION_SUBNET_COUNT - 1).uint64
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node.attestationSubnets.stabilitySubnetExpirationEpoch =
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wallEpoch + getStabilitySubnetLength()
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node.attestationSubnets.stabilitySubnets.setLen(
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node.attachedValidators.count)
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for i in 0 ..< node.attachedValidators.count:
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node.attestationSubnets.stabilitySubnets[i] = (
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subnet: rand(ATTESTATION_SUBNET_COUNT - 1).uint8,
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expiration: wallEpoch + getStabilitySubnetLength())
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node.updateStabilitySubnetMetadata(node.attestationSubnets.stabilitySubnet)
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node.updateStabilitySubnetMetadata(
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node.attestationSubnets.stabilitySubnets.getStabilitySubnets)
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# Sets the "current" and "future" attestation subnets. One of these gets
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# replaced by get_attestation_subnet_changes() immediately.
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# replaced by get_attestation_subnet_changes() immediately. Symmetric so
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# that it's robust to the exact timing of when cycleAttestationSubnets()
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# first runs, by making that first (effective) swap a no-op.
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node.attestationSubnets.subscribedSubnets[0] = initialSubnets
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node.attestationSubnets.subscribedSubnets[1] = initialSubnets
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node.attestationSubnets.enabled = true
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debug "Initial attestation subnets subscribed",
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initialSubnets,
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wallEpoch
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node.installAttestationSubnetHandlers(initialSubnets)
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proc addMessageHandlers(node: BeaconNode): Future[void] =
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@ -457,12 +495,12 @@ proc addMessageHandlers(node: BeaconNode): Future[void] =
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)
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func getTopicSubscriptionEnabled(node: BeaconNode): bool =
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node.attestationSubnets.subscribedSubnets[0].len +
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node.attestationSubnets.subscribedSubnets[1].len > 0
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node.attestationSubnets.enabled
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proc removeMessageHandlers(node: BeaconNode): Future[void] =
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node.attestationSubnets.subscribedSubnets[0] = {}
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node.attestationSubnets.subscribedSubnets[1] = {}
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node.attestationSubnets.enabled = false
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doAssert not node.getTopicSubscriptionEnabled()
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var unsubscriptions = mapIt(
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@ -526,8 +564,9 @@ proc updateGossipStatus(node: BeaconNode, slot: Slot) {.async.} =
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syncQueueLen
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await node.removeMessageHandlers()
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# Subscription or unsubscription might have occurred; recheck
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if slot.isEpoch and node.getTopicSubscriptionEnabled:
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# Subscription or unsubscription might have occurred; recheck.
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if node.getTopicSubscriptionEnabled:
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# This exits early all but one call each epoch.
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await node.cycleAttestationSubnets(slot)
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proc onSlotEnd(node: BeaconNode, slot, nextSlot: Slot): Future[void] =
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@ -87,7 +87,6 @@ proc getValidatorDutiesForEpoch(vc: ValidatorClient, epoch: Epoch) {.gcsafe, asy
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vc.attestationsForEpoch.clear()
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await getAttesterDutiesForEpoch(epoch)
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# obtain the attestation duties this VC should do during the next epoch
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# TODO currently we aren't making use of this but perhaps we should
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await getAttesterDutiesForEpoch(epoch + 1)
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# for now we will get the fork each time we update the validator duties for each epoch
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@ -129,6 +128,9 @@ proc onSlotStart(vc: ValidatorClient, lastSlot, scheduledSlot: Slot) {.gcsafe, a
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# 1 slot earlier because there are a few back-and-forth requests which
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# could take up time for attesting... Perhaps this should be called more
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# than once per epoch because of forks & other events...
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#
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# calling it before epoch n starts means one can't ensure knowing about
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# epoch n+1.
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if slot.isEpoch:
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await getValidatorDutiesForEpoch(vc, epoch)
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@ -264,6 +266,16 @@ proc onSlotStart(vc: ValidatorClient, lastSlot, scheduledSlot: Slot) {.gcsafe, a
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# need similar amounts of memory.
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GC_fullCollect()
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if (slot - 2).isEpoch and (slot.epoch + 1) in vc.attestationsForEpoch:
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for slot, attesterDuties in vc.attestationsForEpoch[slot.epoch + 1].pairs:
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for ad in attesterDuties:
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let
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validator = vc.attachedValidators.validators[ad.public_key]
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sig = await validator.getSlotSig(
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vc.fork, vc.beaconGenesis.genesis_validators_root, slot)
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discard await vc.client.post_v1_validator_beacon_committee_subscriptions(
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ad.committee_index, ad.slot, true, ad.public_key, sig)
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addTimer(nextSlotStart) do (p: pointer):
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asyncCheck vc.onSlotStart(slot, nextSlot)
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@ -15,7 +15,7 @@ import
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chronicles,
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# Local modules
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../spec/[datatypes, digest, crypto, helpers],
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../spec/[datatypes, digest, crypto, helpers, network, signatures],
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../spec/eth2_apis/callsigs_types,
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../block_pools/[chain_dag, spec_cache], ../ssz/merkleization,
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../beacon_node_common, ../beacon_node_types, ../attestation_pool,
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@ -115,5 +115,39 @@ proc installValidatorApiHandlers*(rpcServer: RpcServer, node: BeaconNode) =
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rpcServer.rpc("post_v1_validator_beacon_committee_subscriptions") do (
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committee_index: CommitteeIndex, slot: Slot, aggregator: bool,
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validator_pubkey: ValidatorPubKey, slot_signature: ValidatorSig) -> bool:
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debug "post_v1_validator_beacon_committee_subscriptions"
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raise newException(CatchableError, "Not implemented")
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debug "post_v1_validator_beacon_committee_subscriptions",
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committee_index, slot
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if committee_index.uint64 >= ATTESTATION_SUBNET_COUNT.uint64:
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raise newException(CatchableError,
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"Invalid committee index")
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if node.syncManager.inProgress:
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raise newException(CatchableError,
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"Beacon node is currently syncing and not serving request on that endpoint")
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let wallSlot = node.beaconClock.now.slotOrZero
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if wallSlot > slot + 1:
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raise newException(CatchableError,
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"Past slot requested")
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let epoch = slot.epoch
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if epoch >= wallSlot.epoch and epoch - wallSlot.epoch > 1:
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raise newException(CatchableError,
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"Slot requested not in current or next wall-slot epoch")
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if not verify_slot_signature(
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node.chainDag.headState.data.data.fork,
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node.chainDag.headState.data.data.genesis_validators_root,
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slot, validator_pubkey, slot_signature):
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raise newException(CatchableError,
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"Invalid slot signature")
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let subnet = committee_index.uint8
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if subnet notin node.attestationSubnets.subscribedSubnets[0] and
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subnet notin node.attestationSubnets.subscribedSubnets[1]:
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await node.network.subscribe(getAttestationTopic(
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node.forkDigest, subnet))
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# But it might only be in current
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node.attestationSubnets.subscribedSubnets[0].incl subnet
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node.attestationSubnets.subscribedSubnets[1].incl subnet
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@ -457,9 +457,10 @@ type
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beacon_proposer_indices*: Table[Slot, Option[ValidatorIndex]]
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AttestationSubnets* = object
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enabled*: bool
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nextCycleEpoch*: Epoch
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subscribedSubnets*: array[2, set[uint8]]
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stabilitySubnet*: uint64
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stabilitySubnetExpirationEpoch*: Epoch
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stabilitySubnets*: seq[tuple[subnet: uint8, expiration: Epoch]]
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# This matches the mutable state of the Solidity deposit contract
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# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0/solidity_deposit_contract/deposit_contract.sol
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@ -124,42 +124,54 @@ proc getStabilitySubnetLength*(): uint64 =
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proc get_attestation_subnet_changes*(
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state: BeaconState, attachedValidators: openArray[ValidatorIndex],
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prevAttestationSubnets: AttestationSubnets, epoch: Epoch):
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prevAttestationSubnets: AttestationSubnets):
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tuple[a: AttestationSubnets, b: set[uint8], c: set[uint8]] =
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static: doAssert ATTESTATION_SUBNET_COUNT == 64 # Fits in a set[uint8]
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doAssert attachedValidators.len > 0
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var attestationSubnets = prevAttestationSubnets
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# Guaranteed equivalent to wallSlot by cycleAttestationSubnets(), especially
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# since it'll try to run early in epochs, avoiding race conditions.
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let epoch = state.slot.epoch
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# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0/specs/phase0/validator.md#phase-0-attestation-subnet-stability
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let prevStabilitySubnet = {attestationSubnets.stabilitySubnet.uint8}
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if epoch >= attestationSubnets.stabilitySubnetExpirationEpoch:
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attestationSubnets.stabilitySubnet =
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rand(ATTESTATION_SUBNET_COUNT - 1).uint64
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attestationSubnets.stabilitySubnetExpirationEpoch =
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var
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attestationSubnets = prevAttestationSubnets
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prevStabilitySubnets: set[uint8] = {}
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stabilitySet: set[uint8] = {}
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for i in 0 ..< attestationSubnets.stabilitySubnets.len:
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static: doAssert ATTESTATION_SUBNET_COUNT <= high(uint8)
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prevStabilitySubnets.incl attestationSubnets.stabilitySubnets[i].subnet
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if epoch >= attestationSubnets.stabilitySubnets[i].expiration:
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attestationSubnets.stabilitySubnets[i].subnet =
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rand(ATTESTATION_SUBNET_COUNT - 1).uint8
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attestationSubnets.stabilitySubnets[i].expiration =
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epoch + getStabilitySubnetLength()
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stabilitySet.incl attestationSubnets.stabilitySubnets[i].subnet
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var nextEpochSubnets: set[uint8]
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for it in get_committee_assignments(
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state, state.slot.epoch + 1, attachedValidators.toHashSet):
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state, epoch + 1, attachedValidators.toHashSet):
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nextEpochSubnets.incl it.subnetIndex.uint8
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doAssert nextEpochSubnets.len <= attachedValidators.len
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nextEpochSubnets.incl stabilitySet
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let
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epochParity = epoch mod 2
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stabilitySet = {attestationSubnets.stabilitySubnet.uint8}
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currentEpochSubnets = attestationSubnets.subscribedSubnets[1 - epochParity]
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expiringSubnets =
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(prevStabilitySubnet +
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(prevStabilitySubnets +
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attestationSubnets.subscribedSubnets[epochParity]) -
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nextEpochSubnets - currentEpochSubnets - stabilitySet
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newSubnets =
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(nextEpochSubnets + stabilitySet) -
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(currentEpochSubnets + prevStabilitySubnet)
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nextEpochSubnets - (currentEpochSubnets + prevStabilitySubnets)
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doAssert newSubnets.len <= attachedValidators.len + 1
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doAssert (expiringSubnets * currentEpochSubnets).len == 0
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doAssert newSubnets <= nextEpochSubnets
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attestationSubnets.subscribedSubnets[epochParity] = newSubnets
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attestationSubnets.subscribedSubnets[epochParity] = nextEpochSubnets
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(attestationSubnets, expiringSubnets, newSubnets)
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