nimbus-eth2/tests/mocking/mock_attestations.nim

172 lines
5.2 KiB
Nim

# beacon_chain
# Copyright (c) 2018-2019 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
# Mocking attestations
# ---------------------------------------------------------------
import
# Standard library
sets,
# 0.19.6 shims
# Specs
../../beacon_chain/spec/[datatypes, beaconstate, helpers, validator, crypto],
# Internals
../../beacon_chain/[ssz, extras, state_transition],
# Mocking procs
./mock_blocks,
./mock_validator_keys
proc mockAttestationData(
state: BeaconState,
slot: Slot,
shard: Shard): AttestationData =
doAssert state.slot >= slot
if slot == state.slot:
result.beacon_block_root = mockBlockForNextSlot(state).parent_root
else:
result.beacon_block_root = get_block_root_at_slot(state, slot)
let current_epoch_start_slot = state.get_current_epoch().compute_start_slot_at_epoch()
let epoch_boundary_root = block:
if slot < current_epoch_start_slot:
get_block_root(state, get_previous_epoch(state))
elif slot == current_epoch_start_slot:
result.beacon_block_root
else:
get_block_root(state, get_current_epoch(state))
if slot < current_epoch_start_slot:
result.source = state.previous_justified_checkpoint
else:
result.source = state.current_justified_checkpoint
let target_epoch = compute_epoch_at_slot(slot)
let parent_crosslink = block:
if target_epoch == get_current_epoch(state):
state.current_crosslinks[shard]
else:
state.previous_crosslinks[shard]
result.target = Checkpoint(
epoch: target_epoch, root: epoch_boundary_root
)
result.crosslink = Crosslink(
shard: shard,
start_epoch: parent_crosslink.end_epoch,
end_epoch: min(target_epoch, parent_crosslink.end_epoch + MAX_EPOCHS_PER_CROSSLINK),
parent_root: hash_tree_root(parent_crosslink)
)
proc get_attestation_signature(
state: BeaconState,
attestation_data: AttestationData,
privkey: ValidatorPrivKey
): ValidatorSig =
let msg = AttestationDataAndCustodyBit(
data: attestation_data,
custody_bit: false
).hash_tree_root()
return bls_sign(
key = privkey,
msg = msg.data,
domain = get_domain(
state = state,
domain_type = DOMAIN_BEACON_ATTESTER,
message_epoch = attestation_data.target.epoch
)
)
proc signMockAttestation*(state: BeaconState, attestation: var Attestation) =
var cache = get_empty_per_epoch_cache()
let participants = get_attesting_indices(
state,
attestation.data,
attestation.aggregation_bits,
cache
)
var first_iter = true # Can't do while loop on hashset
for validator_index in participants:
let sig = get_attestation_signature(
state, attestation.data, MockPrivKeys[validator_index]
)
if first_iter:
attestation.signature = sig
first_iter = false
else:
combine(attestation.signature, sig)
proc mockAttestationImpl(
state: BeaconState,
slot: Slot,
flags: UpdateFlags): Attestation =
var cache = get_empty_per_epoch_cache()
let
epoch = compute_epoch_at_slot(slot)
epoch_start_shard = get_start_shard(state, epoch)
committees_per_slot = get_committee_count(state, epoch) div SLOTS_PER_EPOCH
shard = (
epoch_start_shard +
committees_per_slot * (slot mod SLOTS_PER_EPOCH)
) mod SHARD_COUNT
crosslink_committee = get_crosslink_committee(
state,
result.data.target.epoch,
result.data.crosslink.shard,
cache
)
committee_size = crosslink_committee.len
result.data = mockAttestationData(state, slot, shard)
result.aggregation_bits = init(CommitteeValidatorsBits, committee_size)
result.custody_bits = init(CommitteeValidatorsBits, committee_size)
# fillAggregateAttestation
for i in 0 ..< crosslink_committee.len:
result.aggregation_bits[i] = true
if skipValidation notin flags:
signMockAttestation(state, result)
proc mockAttestation*(
state: BeaconState,
flags: UpdateFlags = {}): Attestation {.inline.}=
mockAttestationImpl(state, state.slot, flags)
proc mockAttestation*(
state: BeaconState,
slot: Slot,
flags: UpdateFlags = {}): Attestation {.inline.}=
mockAttestationImpl(state, slot, flags)
proc fillAggregateAttestation*(state: BeaconState, attestation: var Attestation) =
var cache = get_empty_per_epoch_cache()
let crosslink_committee = get_crosslink_committee(
state,
attestation.data.target.epoch,
attestation.data.crosslink.shard,
cache
)
for i in 0 ..< crosslink_committee.len:
attestation.aggregation_bits[i] = true
proc add*(state: var BeaconState, attestation: Attestation, slot: Slot) =
var blck = mockBlockForNextSlot(state)
blck.slot = slot
blck.body.attestations.add attestation
process_slots(state, slot)
signMockBlock(state, blck)
# TODO: we can skip just VerifyStateRoot
doAssert state_transition(state, blck, flags = {skipValidation})