nimbus-eth2/tests/testblockutil.nim

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# beacon_chain
# Copyright (c) 2018-2020 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
options, stew/endians2,
../beacon_chain/[extras, validator_pool],
../beacon_chain/ssz/merkleization,
../beacon_chain/spec/[beaconstate, crypto, datatypes, digest, presets,
helpers, validator, signatures, state_transition]
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func makeFakeValidatorPrivKey(i: int): ValidatorPrivKey =
# 0 is not a valid BLS private key - 1000 helps interop with rust BLS library,
# lighthouse.
# TODO: switch to https://github.com/ethereum/eth2.0-pm/issues/60
var bytes = uint64(i + 1000).toBytesLE()
copyMem(addr result, addr bytes[0], sizeof(bytes))
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 hackPrivKey*(v: Validator): ValidatorPrivKey =
## Extract private key, per above hack
var bytes: array[8, byte]
static: doAssert sizeof(bytes) <= sizeof(v.withdrawal_credentials.data)
copyMem(
addr bytes, unsafeAddr v.withdrawal_credentials.data[0], sizeof(bytes))
let i = int(uint64.fromBytesLE(bytes))
makeFakeValidatorPrivKey(i)
func makeDeposit(i: int, flags: UpdateFlags): DepositData =
## Ugly hack for now: we stick the private key in withdrawal_credentials
## which means we can repro private key and randao reveal from this data,
## for testing :)
let
privkey = makeFakeValidatorPrivKey(i)
pubkey = privkey.toPubKey()
withdrawal_credentials = makeFakeHash(i)
result = DepositData(
pubkey: pubkey,
withdrawal_credentials: withdrawal_credentials,
amount: MAX_EFFECTIVE_BALANCE)
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if skipBLSValidation notin flags:
result.signature = get_deposit_signature(
defaultRuntimePreset, result, privkey)
proc makeInitialDeposits*(
n = SLOTS_PER_EPOCH, flags: UpdateFlags = {}): seq[DepositData] =
for i in 0..<n.int:
result.add makeDeposit(i, flags)
func signBlock*(
fork: Fork, genesis_validators_root: Eth2Digest, blck: BeaconBlock,
privKey: ValidatorPrivKey, flags: UpdateFlags = {}): SignedBeaconBlock =
var root = hash_tree_root(blck)
SignedBeaconBlock(
message: blck,
root: root,
signature:
if skipBlsValidation notin flags:
get_block_signature(
fork, genesis_validators_root, blck.slot, root, privKey)
else:
ValidatorSig()
)
proc addTestBlock*(
state: var HashedBeaconState,
parent_root: Eth2Digest,
cache: var StateCache,
eth1_data = Eth1Data(),
attestations = newSeq[Attestation](),
deposits = newSeq[Deposit](),
graffiti = default(GraffitiBytes),
flags: set[UpdateFlag] = {}): SignedBeaconBlock =
# Create and add a block to state - state will advance by one slot!
doAssert process_slots(state, state.data.slot + 1, cache, flags)
let
proposer_index = get_beacon_proposer_index(state.data, cache)
privKey = hackPrivKey(state.data.validators[proposer_index.get])
randao_reveal =
if skipBlsValidation notin flags:
privKey.genRandaoReveal(
state.data.fork, state.data.genesis_validators_root, state.data.slot)
else:
ValidatorSig()
let
message = makeBeaconBlock(
defaultRuntimePreset,
state,
proposer_index.get(),
parent_root,
randao_reveal,
# Keep deposit counts internally consistent.
Eth1Data(
deposit_root: eth1_data.deposit_root,
deposit_count: state.data.eth1_deposit_index + deposits.lenu64,
block_hash: eth1_data.block_hash),
graffiti,
attestations,
deposits,
@[],
@[],
@[],
noRollback,
cache)
doAssert message.isSome(), "Should have created a valid block!"
let
new_block = signBlock(
state.data.fork,
state.data.genesis_validators_root, message.get(), privKey, flags)
new_block
proc makeTestBlock*(
state: HashedBeaconState,
parent_root: Eth2Digest,
cache: var StateCache,
eth1_data = Eth1Data(),
attestations = newSeq[Attestation](),
deposits = newSeq[Deposit](),
graffiti = default(GraffitiBytes),
flags: set[UpdateFlag] = {}): SignedBeaconBlock =
# 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.
var tmpState = assignClone(state)
addTestBlock(
tmpState[], parent_root, cache, eth1_data, attestations, deposits,
graffiti, flags)
proc makeAttestation*(
state: BeaconState, beacon_block_root: Eth2Digest,
committee: seq[ValidatorIndex], slot: Slot, 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 ->
# montonoic enumerable index, is wasteful and slow. Most test callers
# want ValidatorIndex, so that's supported too.
let
validator = state.validators[validator_index]
sac_index = committee.find(validator_index)
data = makeAttestationData(state, slot, index, beacon_block_root)
doAssert sac_index != -1, "find_beacon_committee should guarantee this"
var aggregation_bits = CommitteeValidatorsBits.init(committee.len)
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aggregation_bits.setBit sac_index
let
sig =
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if skipBLSValidation notin flags:
get_attestation_signature(state.fork, state.genesis_validators_root,
data, hackPrivKey(validator))
else:
ValidatorSig()
Attestation(
data: data,
aggregation_bits: aggregation_bits,
signature: sig
)
proc find_beacon_committee(
state: BeaconState, validator_index: ValidatorIndex,
cache: var StateCache): auto =
let epoch = compute_epoch_at_slot(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.compute_start_slot_at_epoch.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
proc makeAttestation*(
state: BeaconState, beacon_block_root: Eth2Digest,
validator_index: ValidatorIndex, cache: var StateCache,
flags: UpdateFlags = {}): Attestation =
let (committee, slot, index) =
find_beacon_committee(state, validator_index, cache)
makeAttestation(state, beacon_block_root, committee, slot, index,
validator_index, cache, flags)
proc makeFullAttestations*(
state: BeaconState, 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 index in 0'u64..<committees_per_slot:
let
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committee = get_beacon_committee(
state, slot, index.CommitteeIndex, cache)
data = makeAttestationData(state, slot, index.CommitteeIndex, beacon_block_root)
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doAssert committee.len() >= 1
# Initial attestation
var attestation = Attestation(
aggregation_bits: CommitteeValidatorsBits.init(committee.len),
data: data,
signature: get_attestation_signature(
state.fork, state.genesis_validators_root, data,
hackPrivKey(state.validators[committee[0]]))
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)
var agg {.noInit.}: AggregateSignature
agg.init(attestation.signature)
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# Aggregate the remainder
attestation.aggregation_bits.setBit 0
for j in 1 ..< committee.len():
attestation.aggregation_bits.setBit j
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if skipBLSValidation notin flags:
agg.aggregate(get_attestation_signature(
state.fork, state.genesis_validators_root, data,
hackPrivKey(state.validators[committee[j]])
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))
attestation.signature = agg.finish()
result.add attestation
iterator makeTestBlocks*(
state: HashedBeaconState,
parent_root: Eth2Digest,
cache: var StateCache,
blocks: int,
attested: bool,
flags: set[UpdateFlag] = {}
): SignedBeaconBlock =
var
state = assignClone(state)
parent_root = parent_root
for _ in 0..<blocks:
let attestations = if attested:
makeFullAttestations(
state[].data, parent_root,
state[].data.slot, cache, flags)
else:
@[]
let blck = addTestBlock(
state[], parent_root, cache, attestations = attestations, flags = flags)
yield blck
parent_root = blck.root