nimbus-eth2/tests/testblockutil.nim

442 lines
15 KiB
Nim

# beacon_chain
# Copyright (c) 2018-2022 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.
import
std/[options, random],
chronicles,
eth/keys,
stew/endians2,
../beacon_chain/consensus_object_pools/sync_committee_msg_pool,
../beacon_chain/spec/datatypes/bellatrix,
../beacon_chain/spec/[
beaconstate, helpers, keystore, signatures, state_transition, validator]
type
MockPrivKeysT = object
MockPubKeysT = object
const
MockPrivKeys* = MockPrivKeysT()
MockPubKeys* = MockPubKeysT()
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/tests/core/pyspec/eth2spec/test/helpers/keys.py
func `[]`*(_: MockPrivKeysT, index: ValidatorIndex|uint64): ValidatorPrivKey =
# 0 is not a valid BLS private key - 1000 helps interop with rust BLS library,
# lighthouse. EF tests use 1 instead of 1000.
var bytes = (index.uint64 + 1000'u64).toBytesLE()
static: doAssert sizeof(bytes) <= sizeof(result)
copyMem(addr result, addr bytes, sizeof(bytes))
func `[]`*(_: MockPubKeysT, index: ValidatorIndex|uint64): ValidatorPubKey =
MockPrivKeys[index].toPubKey().toPubKey()
func makeFakeHash*(i: int): Eth2Digest =
var bytes = uint64(i).toBytesLE()
static: doAssert sizeof(bytes) <= sizeof(result.data)
copyMem(addr result.data[0], addr bytes[0], sizeof(bytes))
func makeDeposit*(
i: int,
flags: UpdateFlags = {},
cfg = defaultRuntimeConfig): DepositData =
let
privkey = MockPrivKeys[i.ValidatorIndex]
pubkey = MockPubKeys[i.ValidatorIndex]
withdrawal_credentials = makeWithdrawalCredentials(pubkey)
result = DepositData(
pubkey: pubkey,
withdrawal_credentials: withdrawal_credentials,
amount: MAX_EFFECTIVE_BALANCE)
if skipBlsValidation notin flags:
result.signature = get_deposit_signature(cfg, result, privkey).toValidatorSig()
func makeInitialDeposits*(
n = SLOTS_PER_EPOCH, flags: UpdateFlags = {}, cfg = defaultRuntimeConfig): seq[DepositData] =
for i in 0..<n.int:
result.add makeDeposit(i, flags, cfg = cfg)
func signBlock(
fork: Fork, genesis_validators_root: Eth2Digest, forked: ForkedBeaconBlock,
privKey: ValidatorPrivKey, flags: UpdateFlags = {}): ForkedSignedBeaconBlock =
let
slot = withBlck(forked): blck.slot
root = hash_tree_root(forked)
signature =
if skipBlsValidation notin flags:
get_block_signature(
fork, genesis_validators_root, slot, root, privKey).toValidatorSig()
else:
ValidatorSig()
ForkedSignedBeaconBlock.init(forked, root, signature)
proc addTestBlock*(
state: var ForkedHashedBeaconState,
cache: var StateCache,
eth1_data = Eth1Data(),
attestations = newSeq[Attestation](),
deposits = newSeq[Deposit](),
sync_aggregate = SyncAggregate.init(),
graffiti = default(GraffitiBytes),
flags: set[UpdateFlag] = {},
nextSlot = true,
cfg = defaultRuntimeConfig): ForkedSignedBeaconBlock =
# Create and add a block to state - state will advance by one slot!
if nextSlot:
var info = ForkedEpochInfo()
process_slots(
cfg, state, getStateField(state, slot) + 1, cache, info, flags).expect(
"can advance 1")
let
proposer_index = get_beacon_proposer_index(
state, cache, getStateField(state, slot))
privKey = MockPrivKeys[proposer_index.get]
randao_reveal =
if skipBlsValidation notin flags:
get_epoch_signature(
getStateField(state, fork),
getStateField(state, genesis_validators_root),
getStateField(state, slot).epoch, privKey).toValidatorSig()
else:
ValidatorSig()
let
message = makeBeaconBlock(
cfg,
state,
proposer_index.get(),
randao_reveal,
# Keep deposit counts internally consistent.
Eth1Data(
deposit_root: eth1_data.deposit_root,
deposit_count: getStateField(state, eth1_deposit_index) + deposits.lenu64,
block_hash: eth1_data.block_hash),
graffiti,
attestations,
deposits,
BeaconBlockExits(),
sync_aggregate,
default(ExecutionPayload),
noRollback,
cache,
verificationFlags = {skipBlsValidation})
if message.isErr:
raiseAssert "Failed to create a block: " & $message.error
let
new_block = signBlock(
getStateField(state, fork),
getStateField(state, genesis_validators_root), message.get(), privKey,
flags)
new_block
proc makeTestBlock*(
state: ForkedHashedBeaconState,
cache: var StateCache,
eth1_data = Eth1Data(),
attestations = newSeq[Attestation](),
deposits = newSeq[Deposit](),
sync_aggregate = SyncAggregate.init(),
graffiti = default(GraffitiBytes),
cfg = defaultRuntimeConfig): ForkedSignedBeaconBlock =
# Create a block for `state.slot + 1` - like a block proposer would do!
# It's a bit awkward - in order to produce a block for N+1, we need to
# calculate what the state will look like after that block has been applied,
# because the block includes the state root.
let tmpState = assignClone(state)
addTestBlock(
tmpState[], cache, eth1_data,
attestations, deposits, sync_aggregate, graffiti, cfg = cfg)
func makeAttestationData*(
state: ForkyBeaconState, slot: Slot, committee_index: CommitteeIndex,
beacon_block_root: Eth2Digest): AttestationData =
let
current_epoch = get_current_epoch(state)
start_slot = start_slot(current_epoch)
epoch_boundary_block_root =
if start_slot == state.slot: beacon_block_root
else: get_block_root_at_slot(state, start_slot)
doAssert slot.epoch == current_epoch,
"Computed epoch was " & $slot.epoch &
" while the state current_epoch was " & $current_epoch
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#attestation-data
AttestationData(
slot: slot,
index: committee_index.uint64,
beacon_block_root: beacon_block_root,
source: state.current_justified_checkpoint,
target: Checkpoint(
epoch: current_epoch,
root: epoch_boundary_block_root
)
)
func makeAttestationSig*(
fork: Fork, genesis_validators_root: Eth2Digest, data: AttestationData,
committee: openArray[ValidatorIndex],
bits: CommitteeValidatorsBits): ValidatorSig =
let signing_root = compute_attestation_signing_root(
fork, genesis_validators_root, data)
var
agg {.noinit.}: AggregateSignature
first = true
for i in 0..<bits.len():
if not bits[i]: continue
let sig = blsSign(MockPrivKeys[committee[i]], signing_root.data)
if first:
agg.init(sig)
first = false
else:
agg.aggregate(sig)
if first:
ValidatorSig.infinity()
else:
agg.finish().toValidatorSig()
func makeAttestationData*(
state: ForkedHashedBeaconState, slot: Slot, committee_index: CommitteeIndex,
beacon_block_root: Eth2Digest): AttestationData =
## Create an attestation / vote for the block `beacon_block_root` using the
## data in `state` to fill in the rest of the fields.
## `state` is the state corresponding to the `beacon_block_root` advanced to
## the slot we're attesting to.
withState(state):
makeAttestationData(
forkyState.data, slot, committee_index, beacon_block_root)
func makeAttestation*(
state: ForkedHashedBeaconState, beacon_block_root: Eth2Digest,
committee: seq[ValidatorIndex], slot: Slot, committee_index: CommitteeIndex,
validator_index: ValidatorIndex, cache: var StateCache,
flags: UpdateFlags = {}): Attestation =
# Avoids state_sim silliness; as it's responsible for all validators,
# transforming, from monotonic enumerable index -> committee index ->
# monotonic enumerable index, is wasteful and slow. Most test callers
# want ValidatorIndex, so that's supported too.
let
index_in_committee = committee.find(validator_index)
data = makeAttestationData(state, slot, committee_index, beacon_block_root)
doAssert index_in_committee != -1, "find_beacon_committee should guarantee this"
var aggregation_bits = CommitteeValidatorsBits.init(committee.len)
aggregation_bits.setBit index_in_committee
let sig = if skipBlsValidation in flags:
ValidatorSig()
else:
makeAttestationSig(
getStateField(state, fork),
getStateField(state, genesis_validators_root),
data, committee, aggregation_bits)
Attestation(
data: data,
aggregation_bits: aggregation_bits,
signature: sig
)
func find_beacon_committee(
state: ForkedHashedBeaconState, validator_index: ValidatorIndex,
cache: var StateCache): auto =
let epoch = epoch(getStateField(state, slot))
for epoch_committee_index in 0'u64 ..< get_committee_count_per_slot(
state, epoch, cache) * SLOTS_PER_EPOCH:
let
slot = ((epoch_committee_index mod SLOTS_PER_EPOCH) +
epoch.start_slot.uint64).Slot
index = CommitteeIndex(epoch_committee_index div SLOTS_PER_EPOCH)
committee = get_beacon_committee(state, slot, index, cache)
if validator_index in committee:
return (committee, slot, index)
doAssert false
func makeAttestation*(
state: ForkedHashedBeaconState, beacon_block_root: Eth2Digest,
validator_index: ValidatorIndex, cache: var StateCache): Attestation =
let (committee, slot, index) =
find_beacon_committee(state, validator_index, cache)
makeAttestation(state, beacon_block_root, committee, slot, index,
validator_index, cache)
func makeFullAttestations*(
state: ForkedHashedBeaconState, beacon_block_root: Eth2Digest, slot: Slot,
cache: var StateCache,
flags: UpdateFlags = {}): seq[Attestation] =
# Create attestations in which the full committee participates for each shard
# that should be attested to during a particular slot
let committees_per_slot = get_committee_count_per_slot(
state, slot.epoch, cache)
for committee_index in get_committee_indices(committees_per_slot):
let
committee = get_beacon_committee(state, slot, committee_index, cache)
data = makeAttestationData(state, slot, committee_index, beacon_block_root)
doAssert committee.len() >= 1
var attestation = Attestation(
aggregation_bits: CommitteeValidatorsBits.init(committee.len),
data: data)
for i in 0..<committee.len:
attestation.aggregation_bits.setBit(i)
attestation.signature = makeAttestationSig(
getStateField(state, fork),
getStateField(state, genesis_validators_root), data, committee,
attestation.aggregation_bits)
result.add attestation
proc makeSyncAggregate(
state: ForkedHashedBeaconState,
syncCommitteeRatio: float,
cfg: RuntimeConfig): SyncAggregate =
if syncCommitteeRatio <= 0.0:
return SyncAggregate.init()
let
syncCommittee =
withState(state):
when stateFork >= BeaconStateFork.Altair:
if (forkyState.data.slot + 1).is_sync_committee_period():
forkyState.data.next_sync_committee
else:
forkyState.data.current_sync_committee
else:
return SyncAggregate.init()
fork =
getStateField(state, fork)
genesis_validators_root =
getStateField(state, genesis_validators_root)
slot =
getStateField(state, slot)
latest_block_root =
withState(state): state.latest_block_root
syncCommitteePool = newClone(SyncCommitteeMsgPool.init(keys.newRng()))
type
Aggregator = object
subcommitteeIdx: SyncSubcommitteeIndex
validatorIdx: ValidatorIndex
selectionProof: ValidatorSig
let
minActiveParticipants =
if syncCommitteeRatio >= 2.0 / 3: # Ensure supermajority is hit
(SYNC_COMMITTEE_SIZE * 2 + 2) div 3
else:
0
maxActiveParticipants = (syncCommitteeRatio * SYNC_COMMITTEE_SIZE).int
var
aggregators: seq[Aggregator]
numActiveParticipants = 0
for subcommitteeIdx in SyncSubcommitteeIndex:
let
firstKeyIdx = subcommitteeIdx.int * SYNC_SUBCOMMITTEE_SIZE
lastKeyIdx = firstKeyIdx + SYNC_SUBCOMMITTEE_SIZE - 1
var processedKeys = initHashSet[ValidatorPubKey]()
for idx, validatorKey in syncCommittee.pubkeys[firstKeyIdx .. lastKeyIdx]:
if validatorKey in processedKeys:
continue
processedKeys.incl validatorKey
let
validatorIdx =
block:
var res = 0
for i, validator in getStateField(state, validators):
if validator.pubkey == validatorKey:
res = i
break
res.ValidatorIndex
selectionProofSig = get_sync_committee_selection_proof(
fork, genesis_validators_root,
slot, subcommitteeIdx,
MockPrivKeys[validatorIdx])
if is_sync_committee_aggregator(selectionProofSig.toValidatorSig):
aggregators.add Aggregator(
subcommitteeIdx: subcommitteeIdx,
validatorIdx: validatorIdx,
selectionProof: selectionProofSig.toValidatorSig)
if numActiveParticipants >= minActiveParticipants and
rand(1.0) > syncCommitteeRatio:
continue
var positions: seq[uint64]
for pos, key in syncCommittee.pubkeys[firstKeyIdx + idx .. lastKeyIdx]:
if numActiveParticipants >= maxActiveParticipants:
break
if key == validatorKey:
positions.add (idx + pos).uint64
inc numActiveParticipants
if positions.len == 0:
continue
let signature = get_sync_committee_message_signature(
fork, genesis_validators_root,
slot, latest_block_root,
MockPrivKeys[validatorIdx])
syncCommitteePool[].addSyncCommitteeMessage(
slot,
latest_block_root,
uint64 validatorIdx,
signature,
subcommitteeIdx,
positions)
for aggregator in aggregators:
var contribution: SyncCommitteeContribution
if syncCommitteePool[].produceContribution(
slot, latest_block_root, aggregator.subcommitteeIdx, contribution):
let
contributionAndProof = ContributionAndProof(
aggregator_index: uint64 aggregator.validatorIdx,
contribution: contribution,
selection_proof: aggregator.selectionProof)
contributionSig = get_contribution_and_proof_signature(
fork, genesis_validators_root,
contributionAndProof,
MockPrivKeys[aggregator.validatorIdx])
signedContributionAndProof = SignedContributionAndProof(
message: contributionAndProof,
signature: contributionSig.toValidatorSig)
discard syncCommitteePool[].addContribution(
signedContributionAndProof, contribution.signature.load.get)
syncCommitteePool[].produceSyncAggregate(latest_block_root)
iterator makeTestBlocks*(
state: ForkedHashedBeaconState,
cache: var StateCache,
blocks: int,
attested: bool,
syncCommitteeRatio = 0.0,
cfg = defaultRuntimeConfig): ForkedSignedBeaconBlock =
var
state = assignClone(state)
for _ in 0..<blocks:
let
parent_root = withState(state[]): forkyState.latest_block_root
attestations =
if attested:
makeFullAttestations(
state[], parent_root, getStateField(state[], slot), cache)
else:
@[]
sync_aggregate = makeSyncAggregate(state[], syncCommitteeRatio, cfg)
yield addTestBlock(state[], cache,
attestations = attestations, sync_aggregate = sync_aggregate, cfg = cfg)