def build_attestation_data(state, slot, shard):
assert state.slot >= slot
if slot == state.slot:
block_root = build_empty_block_for_next_slot(state).previous_block_root
else:
block_root = get_block_root_at_slot(state, slot)
current_epoch_start_slot = get_epoch_start_slot(get_current_epoch(state))
if slot < current_epoch_start_slot:
epoch_boundary_root = get_block_root(state, get_previous_epoch(state))
elif slot == current_epoch_start_slot:
epoch_boundary_root = block_root
else:
epoch_boundary_root = get_block_root(state, get_current_epoch(state))
if slot < current_epoch_start_slot:
justified_epoch = state.previous_justified_epoch
justified_block_root = state.previous_justified_root
else:
justified_epoch = state.current_justified_epoch
justified_block_root = state.current_justified_root
crosslinks = state.current_crosslinks if slot_to_epoch(slot) == get_current_epoch(state) else state.previous_crosslinks
return AttestationData(
slot=slot,
shard=shard,
beacon_block_root=block_root,
source_epoch=justified_epoch,
source_root=justified_block_root,
target_root=epoch_boundary_root,
crosslink_data_root=spec.ZERO_HASH,
previous_crosslink_root=hash_tree_root(crosslinks[shard]),
)
def test_empty_block_transition(state):
test_state = deepcopy(state)
block = build_empty_block_for_next_slot(test_state)
state_transition(test_state, block)
assert len(test_state.eth1_data_votes) == len(state.eth1_data_votes) + 1
assert get_block_root_at_slot(test_state,
state.slot) == block.previous_block_root
return state, [block], test_state
def test_empty_epoch_transition(state):
test_state = deepcopy(state)
block = build_empty_block_for_next_slot(test_state)
block.slot += spec.SLOTS_PER_EPOCH
state_transition(test_state, block)
assert test_state.slot == block.slot
for slot in range(state.slot, test_state.slot):
assert get_block_root_at_slot(test_state,
slot) == block.previous_block_root
return state, [block], test_state
def test_skipped_slots(state):
test_state = deepcopy(state)
block = build_empty_block_for_next_slot(test_state)
block.slot += 3
state_transition(test_state, block)
assert test_state.slot == block.slot
for slot in range(state.slot, test_state.slot):
assert get_block_root_at_slot(test_state,
slot) == block.previous_block_root
return state, [block], test_state
def test_empty_block_transition(state):
pre_slot = state.slot
pre_eth1_votes = len(state.eth1_data_votes)
yield 'pre', state
block = build_empty_block_for_next_slot(state, signed=True)
yield 'blocks', [block], [spec.BeaconBlock]
state_transition(state, block)
yield 'post', state
assert len(state.eth1_data_votes) == pre_eth1_votes + 1
assert get_block_root_at_slot(state, pre_slot) == block.previous_block_root
def test_empty_epoch_transition(state):
pre_slot = state.slot
yield 'pre', state
block = build_empty_block_for_next_slot(state)
block.slot += spec.SLOTS_PER_EPOCH
sign_block(state, block)
yield 'blocks', [block], [spec.BeaconBlock]
state_transition(state, block)
yield 'post', state
assert state.slot == block.slot
for slot in range(pre_slot, state.slot):
assert get_block_root_at_slot(state, slot) == block.previous_block_root