559 lines
23 KiB
Nim
559 lines
23 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2020 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [Defect].}
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import
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deques, sequtils, tables, options,
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chronicles, stew/[byteutils], json_serialization/std/sets,
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./spec/[beaconstate, datatypes, crypto, digest, helpers, validator],
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./extras, ./block_pool, ./block_pools/candidate_chains, ./beacon_node_types
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logScope: topics = "attpool"
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func init*(T: type AttestationPool, blockPool: BlockPool): T =
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# TODO blockPool is only used when resolving orphaned attestations - it should
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# probably be removed as a dependency of AttestationPool (or some other
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# smart refactoring)
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T(
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slots: initDeque[SlotData](),
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blockPool: blockPool,
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unresolved: initTable[Eth2Digest, UnresolvedAttestation](),
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latestAttestations: initTable[ValidatorPubKey, BlockRef]()
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)
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proc combine*(tgt: var Attestation, src: Attestation, flags: UpdateFlags) =
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## Combine the signature and participation bitfield, with the assumption that
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## the same data is being signed - if the signatures overlap, they are not
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## combined.
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doAssert tgt.data == src.data
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# In a BLS aggregate signature, one needs to count how many times a
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# particular public key has been added - since we use a single bit per key, we
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# can only it once, thus we can never combine signatures that overlap already!
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if not tgt.aggregation_bits.overlaps(src.aggregation_bits):
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tgt.aggregation_bits.combine(src.aggregation_bits)
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if skipBlsValidation notin flags:
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tgt.signature.aggregate(src.signature)
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else:
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trace "Ignoring overlapping attestations"
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# TODO remove/merge with p2p-interface validation
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proc validate(
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state: BeaconState, attestation: Attestation): bool =
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# TODO what constitutes a valid attestation when it's about to be added to
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# the pool? we're interested in attestations that will become viable
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# for inclusion in blocks in the future and on any fork, so we need to
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# consider that validations might happen using the state of a different
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# fork.
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# Some things are always invalid (like out-of-bounds issues etc), but
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# others are more subtle - how do we validate the signature for example?
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# It might be valid on one fork but not another. One thing that helps
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# is that committees are stable per epoch and that it should be OK to
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# include an attestation in a block even if the corresponding validator
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# was slashed in the same epoch - there's no penalty for doing this and
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# the vote counting logic will take care of any ill effects (TODO verify)
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let data = attestation.data
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# TODO re-enable check
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#if not (data.crosslink.shard < SHARD_COUNT):
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# notice "Attestation shard too high",
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# attestation_shard = data.crosslink.shard
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# return
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# Without this check, we can't get a slot number for the attestation as
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# certain helpers will assert
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# TODO this could probably be avoided by being smart about the specific state
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# used to validate the attestation: most likely if we pick the state of
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# the beacon block being voted for and a slot in the target epoch
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# of the attestation, we'll be safe!
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# TODO the above state selection logic should probably live here in the
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# attestation pool
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if not (data.target.epoch == get_previous_epoch(state) or
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data.target.epoch == get_current_epoch(state)):
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notice "Target epoch not current or previous epoch"
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return
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true
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proc slotIndex(
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pool: var AttestationPool, state: BeaconState, attestationSlot: Slot): int =
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## Grow and garbage collect pool, returning the deque index of the slot
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# We keep a sliding window of attestations, roughly from the last finalized
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# epoch to now, because these are the attestations that may affect the voting
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# outcome. Some of these attestations will already have been added to blocks,
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# while others are fresh off the network.
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# TODO only the latest vote of each validator counts. Can we use that somehow?
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logScope: pcs = "atp_slot_maintenance"
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doAssert attestationSlot >= pool.startingSlot,
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"""
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We should have checked in validate that attestation is newer than
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finalized_slot and we never prune things before that, per below condition!
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""" &
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", attestationSlot: " & $shortLog(attestationSlot) &
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", startingSlot: " & $shortLog(pool.startingSlot)
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if pool.slots.len == 0:
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# Because the first attestations may arrive in any order, we'll make sure
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# to start counting at the last finalized epoch start slot - anything
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# earlier than that is thrown out by the above check
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info "First attestation!",
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attestationSlot = $shortLog(attestationSlot),
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cat = "init"
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pool.startingSlot =
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state.finalized_checkpoint.epoch.compute_start_slot_at_epoch()
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if pool.startingSlot + pool.slots.len.uint64 <= attestationSlot:
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trace "Growing attestation pool",
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attestationSlot = $shortLog(attestationSlot),
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startingSlot = $shortLog(pool.startingSlot),
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cat = "caching"
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# Make sure there's a pool entry for every slot, even when there's a gap
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while pool.startingSlot + pool.slots.len.uint64 <= attestationSlot:
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pool.slots.addLast(SlotData())
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if pool.startingSlot <
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state.finalized_checkpoint.epoch.compute_start_slot_at_epoch():
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debug "Pruning attestation pool",
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startingSlot = $shortLog(pool.startingSlot),
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finalizedSlot = $shortLog(
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state.finalized_checkpoint
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.epoch.compute_start_slot_at_epoch()),
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cat = "pruning"
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# TODO there should be a better way to remove a whole epoch of stuff..
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while pool.startingSlot <
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state.finalized_checkpoint.epoch.compute_start_slot_at_epoch():
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pool.slots.popFirst()
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pool.startingSlot += 1
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int(attestationSlot - pool.startingSlot)
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func updateLatestVotes(
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pool: var AttestationPool, state: BeaconState, attestationSlot: Slot,
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participants: seq[ValidatorIndex], blck: BlockRef) =
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for validator in participants:
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let
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pubKey = state.validators[validator].pubkey
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current = pool.latestAttestations.getOrDefault(pubKey)
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if current.isNil or current.slot < attestationSlot:
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pool.latestAttestations[pubKey] = blck
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func get_attesting_indices_seq(state: BeaconState,
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attestation_data: AttestationData,
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bits: CommitteeValidatorsBits,
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cache: var StateCache): seq[ValidatorIndex] =
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toSeq(items(get_attesting_indices(
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state, attestation_data, bits, cache)))
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func addUnresolved(pool: var AttestationPool, attestation: Attestation) =
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pool.unresolved[attestation.data.beacon_block_root] =
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UnresolvedAttestation(
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attestation: attestation,
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)
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proc addResolved(pool: var AttestationPool, blck: BlockRef, attestation: Attestation) =
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doAssert blck.root == attestation.data.beacon_block_root
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# TODO Which state should we use to validate the attestation? It seems
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# reasonable to involve the head being voted for as well as the intended
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# slot of the attestation - double-check this with spec
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# A basic check is that the attestation is at least as new as the block being
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# voted for..
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if blck.slot > attestation.data.slot:
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notice "Invalid attestation (too new!)",
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attestation = shortLog(attestation),
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blockSlot = shortLog(blck.slot)
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return
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updateStateData(
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pool.blockPool, pool.blockPool.tmpState,
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BlockSlot(blck: blck, slot: attestation.data.slot))
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template state(): BeaconState = pool.blockPool.tmpState.data.data
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if not validate(state, attestation):
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notice "Invalid attestation",
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attestation = shortLog(attestation),
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current_epoch = get_current_epoch(state),
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cat = "filtering"
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return
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# TODO inefficient data structures..
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var cache = getEpochCache(blck, state)
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let
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attestationSlot = attestation.data.slot
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idx = pool.slotIndex(state, attestationSlot)
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slotData = addr pool.slots[idx]
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validation = Validation(
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aggregation_bits: attestation.aggregation_bits,
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aggregate_signature: attestation.signature)
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participants = get_attesting_indices_seq(
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state, attestation.data, validation.aggregation_bits, cache)
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var found = false
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for a in slotData.attestations.mitems():
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if a.data == attestation.data:
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for v in a.validations:
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if validation.aggregation_bits.isSubsetOf(v.aggregation_bits):
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# The validations in the new attestation are a subset of one of the
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# attestations that we already have on file - no need to add this
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# attestation to the database
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# TODO what if the new attestation is useful for creating bigger
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# sets by virtue of not overlapping with some other attestation
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# and therefore being useful after all?
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trace "Ignoring subset attestation",
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existingParticipants = get_attesting_indices_seq(
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state, a.data, v.aggregation_bits, cache),
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newParticipants = participants,
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cat = "filtering"
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found = true
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break
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if not found:
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# Attestations in the pool that are a subset of the new attestation
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# can now be removed per same logic as above
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trace "Removing subset attestations",
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existingParticipants = a.validations.filterIt(
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it.aggregation_bits.isSubsetOf(validation.aggregation_bits)
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).mapIt(get_attesting_indices_seq(
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state, a.data, it.aggregation_bits, cache)),
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newParticipants = participants,
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cat = "pruning"
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a.validations.keepItIf(
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not it.aggregation_bits.isSubsetOf(validation.aggregation_bits))
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a.validations.add(validation)
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pool.updateLatestVotes(state, attestationSlot, participants, a.blck)
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info "Attestation resolved",
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attestation = shortLog(attestation),
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validations = a.validations.len(),
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current_epoch = get_current_epoch(state),
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blockSlot = shortLog(blck.slot),
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cat = "filtering"
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found = true
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break
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if not found:
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slotData.attestations.add(AttestationEntry(
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data: attestation.data,
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blck: blck,
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validations: @[validation]
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))
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pool.updateLatestVotes(state, attestationSlot, participants, blck)
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info "Attestation resolved",
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attestation = shortLog(attestation),
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current_epoch = get_current_epoch(state),
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validations = 1,
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blockSlot = shortLog(blck.slot),
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cat = "filtering"
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proc add*(pool: var AttestationPool, attestation: Attestation) =
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logScope: pcs = "atp_add_attestation"
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let blck = pool.blockPool.getOrResolve(attestation.data.beacon_block_root)
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if blck.isNil:
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pool.addUnresolved(attestation)
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return
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pool.addResolved(blck, attestation)
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proc getAttestationsForSlot(pool: AttestationPool, newBlockSlot: Slot):
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Option[SlotData] =
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if newBlockSlot < (GENESIS_SLOT + MIN_ATTESTATION_INCLUSION_DELAY):
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debug "Too early for attestations",
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newBlockSlot = shortLog(newBlockSlot),
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cat = "query"
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return none(SlotData)
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if pool.slots.len == 0: # startingSlot not set yet!
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info "No attestations found (pool empty)",
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newBlockSlot = shortLog(newBlockSlot),
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cat = "query"
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return none(SlotData)
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let
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# TODO in theory we could include attestations from other slots also, but
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# we're currently not tracking which attestations have already been included
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# in blocks on the fork we're aiming for.. this is a conservative approach
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# that's guaranteed to not include any duplicates, because it's the first
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# time the attestations are up for inclusion!
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attestationSlot = newBlockSlot - MIN_ATTESTATION_INCLUSION_DELAY
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if attestationSlot < pool.startingSlot or
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attestationSlot >= pool.startingSlot + pool.slots.len.uint64:
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info "No attestations matching the slot range",
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attestationSlot = shortLog(attestationSlot),
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startingSlot = shortLog(pool.startingSlot),
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endingSlot = shortLog(pool.startingSlot + pool.slots.len.uint64),
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cat = "query"
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return none(SlotData)
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let slotDequeIdx = int(attestationSlot - pool.startingSlot)
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some(pool.slots[slotDequeIdx])
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proc getAttestationsForBlock*(pool: AttestationPool,
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state: BeaconState): seq[Attestation] =
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## Retrieve attestations that may be added to a new block at the slot of the
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## given state
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logScope: pcs = "retrieve_attestation"
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# TODO this shouldn't really need state -- it's to recheck/validate, but that
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# should be refactored
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let newBlockSlot = state.slot
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var attestations: seq[AttestationEntry]
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# This isn't maximally efficient -- iterators or other approaches would
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# avoid lots of memory allocations -- but this provides a more flexible
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# base upon which to experiment with, and isn't yet profiling hot-path,
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# while avoiding penalizing slow attesting too much (as, in the spec it
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# is supposed to be available two epochs back; it's not meant as). This
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# isn't a good solution, either -- see the set-packing comment below as
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# one issue. It also creates problems with lots of repeat attestations,
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# as a bunch of synchronized beacon_nodes do almost the opposite of the
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# intended thing -- sure, _blocks_ have to be popular (via attestation)
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# but _attestations_ shouldn't have to be so frequently repeated, as an
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# artifact of this state-free, identical-across-clones choice basis. In
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# addResolved, too, the new attestations get added to the end, while in
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# these functions, it's reading from the beginning, et cetera. This all
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# needs a single unified strategy.
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const LOOKBACK_WINDOW = 3
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for i in max(1, newBlockSlot.int64 - LOOKBACK_WINDOW) .. newBlockSlot.int64:
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let maybeSlotData = getAttestationsForSlot(pool, i.Slot)
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if maybeSlotData.isSome:
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insert(attestations, maybeSlotData.get.attestations)
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if attestations.len == 0:
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return
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var cache = get_empty_per_epoch_cache()
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for a in attestations:
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var
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/specs/phase0/validator.md#construct-attestation
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attestation = Attestation(
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aggregation_bits: a.validations[0].aggregation_bits,
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data: a.data,
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signature: a.validations[0].aggregate_signature
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)
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if not validate(state, attestation):
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warn "Attestation no longer validates...",
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cat = "query"
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continue
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# TODO what's going on here is that when producing a block, we need to
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# include only such attestations that will not cause block validation
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# to fail. How this interacts with voting and the acceptance of
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# attestations into the pool in general is an open question that needs
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# revisiting - for example, when attestations are added, against which
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# state should they be validated, if at all?
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# TODO we're checking signatures here every time which is very slow - this
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# is needed because validate does nothing for now and we don't want
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# to include a broken attestation
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if not check_attestation(state, attestation, {}, cache):
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continue
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for v in a.validations[1..^1]:
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# TODO We need to select a set of attestations that maximise profit by
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# adding the largest combined attestation set that we can find - this
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# unfortunately looks an awful lot like
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# https://en.wikipedia.org/wiki/Set_packing - here we just iterate
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# and naively add as much as possible in one go, by we could also
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# add the same attestation data twice, as long as there's at least
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# one new attestation in there
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if not attestation.aggregation_bits.overlaps(v.aggregation_bits):
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attestation.aggregation_bits.combine(v.aggregation_bits)
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attestation.signature.aggregate(v.aggregate_signature)
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result.add(attestation)
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if result.len >= MAX_ATTESTATIONS:
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debug "getAttestationsForBlock: returning early after hitting MAX_ATTESTATIONS",
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attestationSlot = newBlockSlot - 1
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return
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proc resolve*(pool: var AttestationPool) =
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logScope: pcs = "atp_resolve"
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var
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done: seq[Eth2Digest]
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resolved: seq[tuple[blck: BlockRef, attestation: Attestation]]
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for k, v in pool.unresolved.mpairs():
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if (let blck = pool.blockPool.getRef(k); not blck.isNil()):
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resolved.add((blck, v.attestation))
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done.add(k)
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elif v.tries > 8:
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done.add(k)
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else:
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inc v.tries
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for k in done:
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pool.unresolved.del(k)
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for a in resolved:
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pool.addResolved(a.blck, a.attestation)
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func latestAttestation*(
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pool: AttestationPool, pubKey: ValidatorPubKey): BlockRef =
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pool.latestAttestations.getOrDefault(pubKey)
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.4/specs/core/0_fork-choice.md
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# The structure of this code differs from the spec since we use a different
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# strategy for storing states and justification points - it should nonetheless
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# be close in terms of functionality.
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func lmdGhost*(
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pool: AttestationPool, start_state: BeaconState,
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start_block: BlockRef): BlockRef =
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# TODO: a Fenwick Tree datastructure to keep track of cumulated votes
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# in O(log N) complexity
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# https://en.wikipedia.org/wiki/Fenwick_tree
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# Nim implementation for cumulative frequencies at
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# https://github.com/numforge/laser/blob/990e59fffe50779cdef33aa0b8f22da19e1eb328/benchmarks/random_sampling/fenwicktree.nim
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let
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active_validator_indices =
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get_active_validator_indices(
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start_state, compute_epoch_at_slot(start_state.slot))
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var latest_messages: seq[tuple[validator: ValidatorIndex, blck: BlockRef]]
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for i in active_validator_indices:
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let pubKey = start_state.validators[i].pubkey
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if (let vote = pool.latestAttestation(pubKey); not vote.isNil):
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latest_messages.add((i, vote))
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# TODO: update to 0.10.1: https://github.com/ethereum/eth2.0-specs/pull/1589/files#diff-9fc3792aa94456eb29506fa77f77b918R143
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template get_latest_attesting_balance(blck: BlockRef): uint64 =
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var res: uint64
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for validator_index, target in latest_messages.items():
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if get_ancestor(target, blck.slot) == blck:
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res += start_state.validators[validator_index].effective_balance
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res
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var head = start_block
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while true:
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if head.children.len() == 0:
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return head
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if head.children.len() == 1:
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head = head.children[0]
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else:
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var
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winner = head.children[0]
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winCount = get_latest_attesting_balance(winner)
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for i in 1..<head.children.len:
|
|
let
|
|
candidate = head.children[i]
|
|
candCount = get_latest_attesting_balance(candidate)
|
|
|
|
if (candCount > winCount) or
|
|
((candCount == winCount and candidate.root.data < winner.root.data)):
|
|
winner = candidate
|
|
winCount = candCount
|
|
head = winner
|
|
|
|
proc selectHead*(pool: AttestationPool): BlockRef =
|
|
let
|
|
justifiedHead = pool.blockPool.latestJustifiedBlock()
|
|
|
|
let newHead =
|
|
lmdGhost(pool, pool.blockPool.justifiedState.data.data, justifiedHead.blck)
|
|
|
|
newHead
|
|
|
|
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/specs/phase0/p2p-interface.md#attestation-subnets
|
|
proc isValidAttestation*(
|
|
pool: AttestationPool, attestation: Attestation, current_slot: Slot,
|
|
topicCommitteeIndex: uint64, flags: UpdateFlags): bool =
|
|
# The attestation's committee index (attestation.data.index) is for the
|
|
# correct subnet.
|
|
if attestation.data.index != topicCommitteeIndex:
|
|
debug "isValidAttestation: attestation's committee index not for the correct subnet",
|
|
topicCommitteeIndex = topicCommitteeIndex,
|
|
attestation_data_index = attestation.data.index
|
|
return false
|
|
|
|
if not (attestation.data.slot + ATTESTATION_PROPAGATION_SLOT_RANGE >=
|
|
current_slot and current_slot >= attestation.data.slot):
|
|
debug "isValidAttestation: attestation.data.slot not within ATTESTATION_PROPAGATION_SLOT_RANGE"
|
|
return false
|
|
|
|
# The attestation is unaggregated -- that is, it has exactly one
|
|
# participating validator (len([bit for bit in attestation.aggregation_bits
|
|
# if bit == 0b1]) == 1).
|
|
# TODO a cleverer algorithm, along the lines of countOnes() in nim-stew
|
|
# But that belongs in nim-stew, since it'd break abstraction layers, to
|
|
# use details of its representation from nim-beacon-chain.
|
|
var onesCount = 0
|
|
for aggregation_bit in attestation.aggregation_bits:
|
|
if not aggregation_bit:
|
|
continue
|
|
onesCount += 1
|
|
if onesCount > 1:
|
|
debug "isValidAttestation: attestation has too many aggregation bits",
|
|
aggregation_bits = attestation.aggregation_bits
|
|
return false
|
|
if onesCount != 1:
|
|
debug "isValidAttestation: attestation has too few aggregation bits"
|
|
return false
|
|
|
|
# The attestation is the first valid attestation received for the
|
|
# participating validator for the slot, attestation.data.slot.
|
|
let maybeSlotData = getAttestationsForSlot(pool, attestation.data.slot)
|
|
if maybeSlotData.isSome:
|
|
for attestationEntry in maybeSlotData.get.attestations:
|
|
if attestation.data != attestationEntry.data:
|
|
continue
|
|
# Attestations might be aggregated eagerly or lazily; allow for both.
|
|
for validation in attestationEntry.validations:
|
|
if attestation.aggregation_bits.isSubsetOf(validation.aggregation_bits):
|
|
debug "isValidAttestation: attestation already exists at slot",
|
|
attestation_data_slot = attestation.data.slot,
|
|
attestation_aggregation_bits = attestation.aggregation_bits,
|
|
attestation_pool_validation = validation.aggregation_bits
|
|
return false
|
|
|
|
# The block being voted for (attestation.data.beacon_block_root) passes
|
|
# validation.
|
|
# We rely on the block pool to have been validated, so check for the
|
|
# existence of the block in the pool.
|
|
# TODO: consider a "slush pool" of attestations whose blocks have not yet
|
|
# propagated - i.e. imagine that attestations are smaller than blocks and
|
|
# therefore propagate faster, thus reordering their arrival in some nodes
|
|
if pool.blockPool.get(attestation.data.beacon_block_root).isNone():
|
|
debug "isValidAttestation: block doesn't exist in block pool",
|
|
attestation_data_beacon_block_root = attestation.data.beacon_block_root
|
|
return false
|
|
|
|
# The signature of attestation is valid.
|
|
# TODO need to know above which validator anyway, and this is too general
|
|
# as it supports aggregated attestations (which this can't be)
|
|
var cache = get_empty_per_epoch_cache()
|
|
if not is_valid_indexed_attestation(
|
|
pool.blockPool.headState.data.data,
|
|
get_indexed_attestation(
|
|
pool.blockPool.headState.data.data, attestation, cache), {}):
|
|
debug "isValidAttestation: signature verification failed"
|
|
return false
|
|
|
|
true
|