318 lines
12 KiB
Nim
318 lines
12 KiB
Nim
import
|
|
deques, options, sequtils, tables,
|
|
chronicles,
|
|
./spec/[beaconstate, bitfield, datatypes, crypto, digest, helpers, validator],
|
|
./extras, ./beacon_chain_db, ./ssz, ./block_pool,
|
|
beacon_node_types
|
|
|
|
proc init*(T: type AttestationPool, blockPool: BlockPool): T =
|
|
T(
|
|
slots: initDeque[SlotData](),
|
|
blockPool: blockPool,
|
|
unresolved: initTable[Eth2Digest, UnresolvedAttestation](),
|
|
latestAttestations: initTable[ValidatorPubKey, BlockRef]()
|
|
)
|
|
|
|
|
|
proc combine*(tgt: var Attestation, src: Attestation, flags: UpdateFlags) =
|
|
# Combine the signature and participation bitfield, with the assumption that
|
|
# the same data is being signed!
|
|
|
|
doAssert tgt.data == src.data
|
|
|
|
# TODO:
|
|
# when BLS signatures are combined, we must ensure that
|
|
# the same participant key is not included on both sides
|
|
tgt.aggregation_bitfield.combine(src.aggregation_bitfield)
|
|
|
|
if skipValidation notin flags:
|
|
tgt.aggregate_signature.combine(src.aggregate_signature)
|
|
|
|
proc validate(
|
|
state: BeaconState, attestation: Attestation, flags: UpdateFlags): bool =
|
|
# TODO these validations should probably be done elsewhere, and really bad
|
|
# attestations should probably cause some sort of feedback to the network
|
|
# layer so they don't spread further.. is there a sliding scale here of
|
|
# badness?
|
|
|
|
# TODO half of this stuff is from beaconstate.validateAttestation - merge?
|
|
|
|
let attestationSlot = attestation.data.slot
|
|
|
|
if attestationSlot < state.finalized_epoch.get_epoch_start_slot():
|
|
debug "Old attestation",
|
|
attestationSlot = humaneSlotNum(attestationSlot),
|
|
attestationEpoch = humaneEpochNum(attestationSlot.slot_to_epoch),
|
|
stateSlot = humaneSlotNum(state.slot),
|
|
finalizedEpoch = humaneEpochNum(state.finalized_epoch)
|
|
|
|
return
|
|
|
|
# TODO what makes sense here? If an attestation is from the future with
|
|
# regards to the state, something is wrong - it's a bad attestation, we're
|
|
# desperatly behind or someone is sending bogus attestations...
|
|
if attestationSlot > state.slot + 64:
|
|
debug "Future attestation",
|
|
attestationSlot = humaneSlotNum(attestationSlot),
|
|
attestationEpoch = humaneEpochNum(attestationSlot.slot_to_epoch),
|
|
stateSlot = humaneSlotNum(state.slot),
|
|
finalizedEpoch = humaneEpochNum(state.finalized_epoch)
|
|
return
|
|
|
|
if not allIt(attestation.custody_bitfield.bits, it == 0):
|
|
notice "Invalid custody bitfield for phase 0"
|
|
return false
|
|
|
|
if not anyIt(attestation.aggregation_bitfield.bits, it != 0):
|
|
notice "Empty aggregation bitfield"
|
|
return false
|
|
|
|
let crosslink_committee = mapIt(
|
|
filterIt(get_crosslink_committees_at_slot(state, attestation.data.slot),
|
|
it.shard == attestation.data.shard),
|
|
it.committee)[0]
|
|
|
|
## the rest; turns into expensive NOP until then.
|
|
if skipValidation notin flags:
|
|
let
|
|
participants = get_attestation_participants(
|
|
state, attestation.data, attestation.aggregation_bitfield)
|
|
|
|
## TODO when the custody_bitfield assertion-to-emptiness disappears do this
|
|
## and fix the custody_bit_0_participants check to depend on it.
|
|
# custody_bit_1_participants = {nothing, always, because assertion above}
|
|
custody_bit_1_participants: seq[ValidatorIndex] = @[]
|
|
custody_bit_0_participants = participants
|
|
|
|
group_public_key = bls_aggregate_pubkeys(
|
|
participants.mapIt(state.validator_registry[it].pubkey))
|
|
|
|
# Verify that aggregate_signature verifies using the group pubkey.
|
|
if not bls_verify_multiple(
|
|
@[
|
|
bls_aggregate_pubkeys(mapIt(custody_bit_0_participants,
|
|
state.validator_registry[it].pubkey)),
|
|
bls_aggregate_pubkeys(mapIt(custody_bit_1_participants,
|
|
state.validator_registry[it].pubkey)),
|
|
],
|
|
@[
|
|
hash_tree_root(AttestationDataAndCustodyBit(
|
|
data: attestation.data, custody_bit: false)),
|
|
hash_tree_root(AttestationDataAndCustodyBit(
|
|
data: attestation.data, custody_bit: true)),
|
|
],
|
|
attestation.aggregate_signature,
|
|
get_domain(state.fork, slot_to_epoch(attestation.data.slot),
|
|
DOMAIN_ATTESTATION),
|
|
):
|
|
notice "Invalid signature", participants
|
|
return false
|
|
|
|
true
|
|
|
|
proc slotIndex(
|
|
pool: var AttestationPool, state: BeaconState, attestationSlot: Slot): int =
|
|
## Grow and garbage collect pool, returning the deque index of the slot
|
|
|
|
# We keep a sliding window of attestations, roughly from the last finalized
|
|
# epoch to now, because these are the attestations that may affect the voting
|
|
# outcome. Some of these attestations will already have been added to blocks,
|
|
# while others are fresh off the network.
|
|
|
|
doAssert attestationSlot >= pool.startingSlot,
|
|
"""
|
|
We should have checked in validate that attestation is newer than
|
|
finalized_slot and we never prune things before that, per below condition!
|
|
""" &
|
|
", attestationSlot: " & $humaneSlotNum(attestationSlot) &
|
|
", startingSlot: " & $humaneSlotNum(pool.startingSlot)
|
|
|
|
if pool.slots.len == 0:
|
|
# Because the first attestations may arrive in any order, we'll make sure
|
|
# to start counting at the last finalized epoch start slot - anything
|
|
# earlier than that is thrown out by the above check
|
|
info "First attestation!",
|
|
attestationSlot = $humaneSlotNum(attestationSlot)
|
|
pool.startingSlot = state.finalized_epoch.get_epoch_start_slot()
|
|
|
|
if pool.startingSlot + pool.slots.len.uint64 <= attestationSlot:
|
|
debug "Growing attestation pool",
|
|
attestationSlot = $humaneSlotNum(attestationSlot),
|
|
startingSlot = $humaneSlotNum(pool.startingSlot)
|
|
|
|
# Make sure there's a pool entry for every slot, even when there's a gap
|
|
while pool.startingSlot + pool.slots.len.uint64 <= attestationSlot:
|
|
pool.slots.addLast(SlotData())
|
|
|
|
if pool.startingSlot < state.finalized_epoch.get_epoch_start_slot():
|
|
debug "Pruning attestation pool",
|
|
startingSlot = $humaneSlotNum(pool.startingSlot),
|
|
finalizedSlot =
|
|
$humaneSlotNum(state.finalized_epoch.get_epoch_start_slot())
|
|
|
|
# TODO there should be a better way to remove a whole epoch of stuff..
|
|
while pool.startingSlot < state.finalized_epoch.get_epoch_start_slot():
|
|
pool.slots.popFirst()
|
|
pool.startingSlot += 1
|
|
|
|
int(attestationSlot - pool.startingSlot)
|
|
|
|
proc updateLatestVotes(
|
|
pool: var AttestationPool, state: BeaconState, attestationSlot: Slot,
|
|
participants: seq[ValidatorIndex], blck: BlockRef) =
|
|
for validator in participants:
|
|
let
|
|
pubKey = state.validator_registry[validator].pubkey
|
|
current = pool.latestAttestations.getOrDefault(pubKey)
|
|
if current.isNil or current.slot < attestationSlot:
|
|
pool.latestAttestations[pubKey] = blck
|
|
|
|
proc add*(pool: var AttestationPool,
|
|
state: BeaconState,
|
|
attestation: Attestation) =
|
|
if not validate(state, attestation, {skipValidation}):
|
|
return
|
|
|
|
# TODO inefficient data structures..
|
|
|
|
let
|
|
attestationSlot = attestation.data.slot
|
|
idx = pool.slotIndex(state, attestationSlot)
|
|
slotData = addr pool.slots[idx]
|
|
validation = Validation(
|
|
aggregation_bitfield: attestation.aggregation_bitfield,
|
|
custody_bitfield: attestation.custody_bitfield,
|
|
aggregate_signature: attestation.aggregate_signature)
|
|
participants = get_attestation_participants(
|
|
state, attestation.data, validation.aggregation_bitfield)
|
|
|
|
var found = false
|
|
for a in slotData.attestations.mitems():
|
|
if a.data == attestation.data:
|
|
for v in a.validations:
|
|
if v.aggregation_bitfield.overlaps(validation.aggregation_bitfield):
|
|
# TODO this check is here so that later, when we combine signatures,
|
|
# there is no overlap (each validator must be represented once
|
|
# only). this is wrong - we could technically receive
|
|
# attestations that have already been combined (for example when
|
|
# feeding in attestations from blocks, which we're not doing yet)
|
|
# but then we'll also have to update the combine logic to deal
|
|
# with this complication.
|
|
debug "Ignoring overlapping attestation",
|
|
existingParticipants = get_attestation_participants(
|
|
state, a.data, v.aggregation_bitfield),
|
|
newParticipants = participants
|
|
found = true
|
|
break
|
|
|
|
if not found:
|
|
a.validations.add(validation)
|
|
pool.updateLatestVotes(state, attestationSlot, participants, a.blck)
|
|
|
|
info "Attestation resolved",
|
|
attestationData = shortLog(attestation.data),
|
|
validations = a.validations.len() # TODO popcount of union
|
|
|
|
found = true
|
|
|
|
break
|
|
|
|
if not found:
|
|
if (let blck = pool.blockPool.getOrResolve(
|
|
attestation.data.beacon_block_root); blck != nil):
|
|
slotData.attestations.add(AttestationEntry(
|
|
data: attestation.data,
|
|
blck: blck,
|
|
validations: @[validation]
|
|
))
|
|
pool.updateLatestVotes(state, attestationSlot, participants, blck)
|
|
|
|
info "Attestation resolved",
|
|
attestationData = shortLog(attestation.data),
|
|
validations = 1
|
|
|
|
else:
|
|
pool.unresolved[attestation.data.beacon_block_root] =
|
|
UnresolvedAttestation(
|
|
attestation: attestation,
|
|
)
|
|
|
|
proc getAttestationsForBlock*(pool: AttestationPool,
|
|
newBlockSlot: Slot): seq[Attestation] =
|
|
if newBlockSlot - GENESIS_SLOT < MIN_ATTESTATION_INCLUSION_DELAY:
|
|
debug "Too early for attestations",
|
|
newBlockSlot = humaneSlotNum(newBlockSlot)
|
|
return
|
|
|
|
if pool.slots.len == 0: # startingSlot not set yet!
|
|
info "No attestations found (pool empty)",
|
|
newBlockSlot = humaneSlotNum(newBlockSlot)
|
|
return
|
|
|
|
let
|
|
# TODO in theory we could include attestations from other slots also, but
|
|
# we're currently not tracking which attestations have already been included
|
|
# in blocks on the fork we're aiming for.. this is a conservative approach
|
|
# that's guaranteed to not include any duplicates, because it's the first
|
|
# time the attestations are up for inclusion!
|
|
attestationSlot = newBlockSlot - MIN_ATTESTATION_INCLUSION_DELAY
|
|
|
|
if attestationSlot < pool.startingSlot or
|
|
attestationSlot >= pool.startingSlot + pool.slots.len.uint64:
|
|
info "No attestations",
|
|
attestationSlot = humaneSlotNum(attestationSlot),
|
|
startingSlot = humaneSlotNum(pool.startingSlot),
|
|
endingSlot = humaneSlotNum(pool.startingSlot + pool.slots.len.uint64)
|
|
|
|
return
|
|
|
|
let
|
|
slotDequeIdx = int(attestationSlot - pool.startingSlot)
|
|
slotData = pool.slots[slotDequeIdx]
|
|
|
|
for a in slotData.attestations:
|
|
var
|
|
attestation = Attestation(
|
|
aggregation_bitfield: a.validations[0].aggregation_bitfield,
|
|
data: a.data,
|
|
custody_bitfield: a.validations[0].custody_bitfield,
|
|
aggregate_signature: a.validations[0].aggregate_signature
|
|
)
|
|
|
|
for v in a.validations[1..^1]:
|
|
if not attestation.aggregation_bitfield.overlaps(
|
|
v.aggregation_bitfield):
|
|
attestation.aggregation_bitfield.combine(
|
|
v.aggregation_bitfield)
|
|
attestation.custody_bitfield.combine(v.custody_bitfield)
|
|
attestation.aggregate_signature.combine(v.aggregate_signature)
|
|
|
|
result.add(attestation)
|
|
|
|
if result.len >= MAX_ATTESTATIONS:
|
|
return
|
|
|
|
proc resolve*(pool: var AttestationPool, state: BeaconState) =
|
|
var done: seq[Eth2Digest]
|
|
var resolved: seq[Attestation]
|
|
|
|
for k, v in pool.unresolved.mpairs():
|
|
if v.tries > 8 or v.attestation.data.slot < pool.startingSlot:
|
|
done.add(k)
|
|
else:
|
|
if pool.blockPool.get(k).isSome():
|
|
resolved.add(v.attestation)
|
|
done.add(k)
|
|
else:
|
|
inc v.tries
|
|
|
|
for k in done:
|
|
pool.unresolved.del(k)
|
|
|
|
for a in resolved:
|
|
pool.add(state, a)
|
|
|
|
proc latestAttestation*(
|
|
pool: AttestationPool, pubKey: ValidatorPubKey): BlockRef =
|
|
pool.latestAttestations.getOrDefault(pubKey)
|