from copy import deepcopy from eth2spec.test.helpers.keys import privkeys from eth2spec.utils.bls import ( bls_sign, only_with_bls, ) from eth2spec.utils.ssz.ssz_impl import ( signing_root, ) from .attestations import ( sign_shard_attestation, ) @only_with_bls() def sign_shard_block(spec, beacon_state, shard_state, block, proposer_index=None): if proposer_index is None: proposer_index = spec.get_shard_proposer_index(beacon_state, shard_state.shard, block.slot) privkey = privkeys[proposer_index] block.signature = bls_sign( message_hash=signing_root(block), privkey=privkey, domain=spec.get_domain( beacon_state, spec.DOMAIN_SHARD_PROPOSER, spec.compute_epoch_of_shard_slot(block.slot), ) ) def build_empty_shard_block(spec, beacon_state, shard_state, slot, signed=False, full_attestation=False): if slot is None: slot = shard_state.slot previous_beacon_header = deepcopy(beacon_state.latest_block_header) if previous_beacon_header.state_root == spec.Bytes32(): previous_beacon_header.state_root = beacon_state.hash_tree_root() beacon_block_root = spec.signing_root(previous_beacon_header) previous_block_header = deepcopy(shard_state.latest_block_header) if previous_block_header.state_root == spec.Bytes32(): previous_block_header.state_root = shard_state.hash_tree_root() parent_root = signing_root(previous_block_header) block = spec.ShardBlock( shard=shard_state.shard, slot=slot, beacon_block_root=beacon_block_root, parent_root=parent_root, block_size_sum=shard_state.block_size_sum + spec.SHARD_HEADER_SIZE, ) if full_attestation: shard_committee = spec.get_shard_committee(beacon_state, shard_state.shard, block.slot) block.aggregation_bits = list( (True,) * len(shard_committee) + (False,) * (spec.MAX_PERIOD_COMMITTEE_SIZE * 2 - len(shard_committee)) ) else: shard_committee = [] block.attestations = sign_shard_attestation( spec, beacon_state, shard_state, block, participants=shard_committee, ) if signed: sign_shard_block(spec, beacon_state, shard_state, block) return block