def test_parent_from_same_slot(spec, state):
yield 'pre', state
parent_block = build_empty_block_for_next_slot(spec, state)
signed_parent_block = state_transition_and_sign_block(
spec, state, parent_block)
child_block = parent_block.copy()
child_block.parent_root = state.latest_block_header.hash_tree_root()
if is_post_merge(spec):
child_block.body.execution_payload = build_empty_execution_payload(
spec, state)
# Show that normal path through transition fails
failed_state = state.copy()
expect_assertion_error(lambda: spec.state_transition(
failed_state,
spec.SignedBeaconBlock(message=child_block),
validate_result=False))
# Artificially bypass the restriction in the state transition to transition and sign block for test vectors
signed_child_block = process_and_sign_block_without_header_validations(
spec, state, child_block)
yield 'blocks', [signed_parent_block, signed_child_block]
yield 'post', None
def build_empty_block(spec, state, slot=None):
"""
Build empty block for ``slot``, built upon the latest block header seen by ``state``.
Slot must be greater than or equal to the current slot in ``state``.
"""
if slot is None:
slot = state.slot
if slot < state.slot:
raise Exception("build_empty_block cannot build blocks for past slots")
if state.slot < slot:
# transition forward in copied state to grab relevant data from state
state = state.copy()
spec.process_slots(state, slot)
state, parent_block_root = get_state_and_beacon_parent_root_at_slot(
spec, state, slot)
empty_block = spec.BeaconBlock()
empty_block.slot = slot
empty_block.proposer_index = spec.get_beacon_proposer_index(state)
empty_block.body.eth1_data.deposit_count = state.eth1_deposit_index
empty_block.parent_root = parent_block_root
if is_post_altair(spec):
empty_block.body.sync_aggregate.sync_committee_signature = spec.G2_POINT_AT_INFINITY
if is_post_merge(spec):
empty_block.body.execution_payload = build_empty_execution_payload(
spec, state)
apply_randao_reveal(spec, state, empty_block)
return empty_block
def process_and_sign_block_without_header_validations(spec, state, block):
"""
Artificially bypass the restrictions in the state transition to transition and sign block
WARNING UNSAFE: Only use when generating valid-looking invalid blocks for test vectors
"""
# Perform single mutation in `process_block_header`
state.latest_block_header = spec.BeaconBlockHeader(
slot=block.slot,
proposer_index=block.proposer_index,
parent_root=block.parent_root,
state_root=spec.Bytes32(),
body_root=block.body.hash_tree_root(),
)
if is_post_merge(spec):
if spec.is_execution_enabled(state, block.body):
spec.process_execution_payload(state, block.body.execution_payload,
spec.EXECUTION_ENGINE)
# Perform rest of process_block transitions
spec.process_randao(state, block.body)
spec.process_eth1_data(state, block.body)
spec.process_operations(state, block.body)
if is_post_altair(spec):
spec.process_sync_aggregate(state, block.body.sync_aggregate)
# Insert post-state rot
block.state_root = state.hash_tree_root()
# Sign block
return sign_block(spec, state, block)