nimbus-eth2/tests/mocking/mock_attestations.nim

114 lines
3.4 KiB
Nim

# beacon_chain
# Copyright (c) 2018-2021 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.
# Mocking attestations
# ---------------------------------------------------------------
import
# Status
chronicles,
# Specs
../../beacon_chain/spec/datatypes/phase0,
../../beacon_chain/spec/[beaconstate, forks, helpers, validator, signatures],
# Test utilities
./mock_blocks,
../testblockutil
proc mockAttestationData(
state: phase0.BeaconState,
slot: Slot,
index: uint64): AttestationData =
doAssert state.slot >= slot
if slot == state.slot:
let forkedState = (ref ForkedHashedBeaconState)(kind: BeaconStateFork.Phase0,
phase0Data: phase0.HashedBeaconState(root: hash_tree_root(state), data: state))
result.beacon_block_root = mockBlockForNextSlot(forkedState[]).phase0Data.message.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)
result.slot = slot
result.index = index
result.target = Checkpoint(
epoch: target_epoch, root: epoch_boundary_root
)
proc signMockAttestation*(state: phase0.BeaconState, attestation: var Attestation) =
var cache = StateCache()
var agg {.noInit.}: AggregateSignature
var first_iter = true # Can't do while loop on hashset
for validator_index in get_attesting_indices(
state,
attestation.data,
attestation.aggregation_bits,
cache
):
let sig = get_attestation_signature(
state.fork, state.genesis_validators_root, attestation.data,
MockPrivKeys[validator_index]
)
if first_iter:
agg.init(sig)
first_iter = false
else:
agg.aggregate(sig)
if first_iter != true:
attestation.signature = agg.finish().toValidatorSig()
# Otherwise no participants so zero sig
proc mockAttestationImpl(
state: phase0.BeaconState,
slot: Slot): Attestation =
var cache = StateCache()
let
beacon_committee = get_beacon_committee(
state,
result.data.slot,
result.data.index.CommitteeIndex,
cache
)
committee_size = beacon_committee.len
result.data = mockAttestationData(state, slot, 0)
result.aggregation_bits = init(CommitteeValidatorsBits, committee_size)
# fillAggregateAttestation
for i in 0 ..< beacon_committee.len:
result.aggregation_bits[i] = true
signMockAttestation(state, result)
proc mockAttestation*(
state: phase0.BeaconState): Attestation =
mockAttestationImpl(state, state.slot)
proc mockAttestation*(
state: phase0.BeaconState,
slot: Slot): Attestation =
mockAttestationImpl(state, slot)