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,
chronicles, eth/trie/[db],
../beacon_chain/[beacon_chain_db, block_pool, extras, merkle_minimal, ssz,
state_transition, validator_pool],
../beacon_chain/spec/[beaconstate, crypto, datatypes, digest,
helpers, validator, state_transition_block]
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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): Deposit =
## 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)
domain = compute_domain(DOMAIN_DEPOSIT, Version(GENESIS_FORK_VERSION))
result = Deposit(
data: DepositData(
pubkey: pubkey,
withdrawal_credentials: withdrawal_credentials,
amount: MAX_EFFECTIVE_BALANCE,
)
)
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if skipBLSValidation notin flags:
let signing_root = compute_signing_root(result.getDepositMessage, domain)
result.data.signature = bls_sign(privkey, signing_root.data)
proc makeInitialDeposits*(
n = SLOTS_PER_EPOCH, flags: UpdateFlags = {}): seq[Deposit] =
for i in 0..<n.int:
result.add makeDeposit(i, flags)
# This needs to be done as a batch, since the Merkle proof of the i'th
# deposit depends on the deposit (data) of the 0th through (i-1)st, of
# deposits. Computing partial hash_tree_root sequences of DepositData,
# and ideally (but not yet) efficiently only once calculating a Merkle
# tree utilizing as much of the shared substructure as feasible, means
# attaching proofs all together, as a separate step.
if skipMerkleValidation notin flags:
attachMerkleProofs(result)
func signBlock*(
fork: Fork, genesis_validators_root: Eth2Digest, blck: BeaconBlock,
privKey: ValidatorPrivKey, flags: UpdateFlags = {}): SignedBeaconBlock =
SignedBeaconBlock(
message: blck,
signature:
if skipBlsValidation notin flags:
get_block_signature(
fork, genesis_validators_root, blck.slot,
hash_tree_root(blck), privKey)
else:
ValidatorSig()
)
proc addTestBlock*(
state: var HashedBeaconState,
parent_root: Eth2Digest,
eth1_data = Eth1Data(),
attestations = newSeq[Attestation](),
deposits = newSeq[Deposit](),
graffiti = Eth2Digest(),
flags: set[UpdateFlag] = {}): SignedBeaconBlock =
# Create and add a block to state - state will advance by one slot!
advance_slot(state, err(Opt[Eth2Digest]), flags)
var cache = get_empty_per_epoch_cache()
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(
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.len.uint64,
block_hash: eth1_data.block_hash),
graffiti,
attestations,
deposits,
noRollback)
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,
eth1_data = Eth1Data(),
attestations = newSeq[Attestation](),
deposits = newSeq[Deposit](),
graffiti = Eth2Digest(),
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 = newClone(state)
addTestBlock(
tmpState[], parent_root, eth1_data, attestations, deposits, graffiti, flags)
proc makeAttestation*(
state: BeaconState, beacon_block_root: Eth2Digest,
committee: seq[ValidatorIndex], slot: Slot, index: uint64,
validator_index: auto, 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_at_slot(
state, epoch.compute_start_slot_at_epoch) * SLOTS_PER_EPOCH:
let
slot = ((epoch_committee_index mod SLOTS_PER_EPOCH) +
epoch.compute_start_slot_at_epoch.uint64).Slot
index = epoch_committee_index div SLOTS_PER_EPOCH
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committee = get_beacon_committee(state, slot, index.CommitteeIndex, 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
count = get_committee_count_at_slot(state, slot)
for index in 0..<count:
let
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committee = get_beacon_committee(
state, slot, index.CommitteeIndex, cache)
data = makeAttestationData(state, slot, index, 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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)
# 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:
attestation.signature.aggregate(get_attestation_signature(
state.fork, state.genesis_validators_root, data,
hackPrivKey(state.validators[committee[j]])
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))
result.add attestation