def test_get_state_by_slot(valid_chain, genesis_block, genesis_state, keymap):
# First, skip block and check if `get_state_by_slot` returns the expected state
state_machine = valid_chain.get_state_machine(genesis_block.slot)
config = state_machine.config
state = valid_chain.get_head_state()
block_skipped_slot = genesis_block.slot + 1
block_skipped_state, _ = state_machine.apply_state_transition(
state, future_slot=block_skipped_slot)
valid_chain.chaindb.persist_state(block_skipped_state)
with pytest.raises(StateNotFound):
valid_chain.get_state_by_slot(block_skipped_slot)
# Next, import proposed block and check if `get_state_by_slot` returns the expected state
proposed_slot = block_skipped_slot + 1
future_state, _ = state_machine.apply_state_transition(
block_skipped_state, future_slot=proposed_slot)
proposer_index = get_beacon_proposer_index(future_state, config)
proposer = block_skipped_state.validators[proposer_index].pubkey
private_key = keymap[proposer]
randao_reveal = generate_randao_reveal(private_key, proposed_slot,
block_skipped_state, config)
block = create_block(
proposed_slot,
genesis_block.message.hash_tree_root,
randao_reveal,
state.eth1_data,
(),
block_skipped_state,
state_machine,
private_key,
)
valid_chain.import_block(block)
state = valid_chain.get_head_state()
assert (valid_chain.get_state_by_slot(proposed_slot).hash_tree_root ==
state.hash_tree_root)
def test_import_blocks(valid_chain, genesis_block, genesis_state, config,
keymap):
state = genesis_state
blocks = (genesis_block, )
valid_chain_2 = copy.deepcopy(valid_chain)
for _ in range(3):
state_machine = valid_chain.get_state_machine(blocks[-1].slot)
parent_block = blocks[-1]
slot = state.slot + 2
future_state, _ = state_machine.apply_state_transition(
state, future_slot=state.slot + 2)
proposer_index = get_beacon_proposer_index(future_state, config)
proposer = state.validators[proposer_index].pubkey
private_key = keymap[proposer]
randao_reveal = generate_randao_reveal(private_key, slot, state,
config)
block = create_block(
slot,
parent_block.message.hash_tree_root,
randao_reveal,
state.eth1_data,
(),
state,
state_machine,
private_key,
)
valid_chain.import_block(block)
assert valid_chain.get_canonical_head() == block
state = valid_chain.get_head_state()
assert block == valid_chain.get_canonical_block_by_slot(block.slot)
assert block.message.hash_tree_root == valid_chain.get_canonical_block_root(
block.slot)
blocks += (block, )
assert valid_chain.get_canonical_head(
) != valid_chain_2.get_canonical_head()
for block in blocks[1:]:
valid_chain_2.import_block(block)
assert valid_chain.get_canonical_head(
) == valid_chain_2.get_canonical_head()
assert valid_chain.get_head_state().slot != 0
assert valid_chain.get_head_state() == valid_chain_2.get_head_state()
def _build_chain_of_blocks_with_states(
chain,
state,
parent_block,
slots,
config,
keymap,
attestation_participation=1.0,
eth1_block_hash=ZERO_HASH32,
):
blocks = ()
states = ()
for slot in range(parent_block.slot + 1, parent_block.slot + 1 + slots):
sm = chain.get_state_machine(state.slot)
pre_state, _ = sm.apply_state_transition(state, future_slot=slot)
proposer_index = get_beacon_proposer_index(pre_state, config)
public_key = state.validators[proposer_index].pubkey
private_key = keymap[public_key]
randao_reveal = generate_randao_reveal(private_key, slot, pre_state,
config)
attestations = create_mock_signed_attestations_at_slot(
state,
config,
sm,
slot - 1,
parent_block.hash_tree_root,
keymap,
voted_attesters_ratio=attestation_participation,
)
block = create_block(
slot,
parent_block.hash_tree_root,
randao_reveal,
Eth1Data.create(block_hash=eth1_block_hash),
attestations,
state,
sm,
private_key,
)
parent_block = block.message
state, block = sm.apply_state_transition(state, block)
blocks += (block, )
states += (state, )
return blocks, states
async def propose_block(
self,
proposer_index: ValidatorIndex,
slot: Slot,
state: BeaconState,
state_machine: BaseBeaconStateMachine,
head_block: BaseBeaconBlock,
) -> BaseBeaconBlock:
"""
Propose a block and broadcast it.
"""
eth1_vote = await self._get_eth1_vote(slot, state, state_machine)
# deposits = await self._get_deposit_data(state, state_machine, eth1_vote)
# TODO(hwwhww): Check if need to aggregate and if they are overlapping.
aggregated_attestations = self.get_ready_attestations(slot, True)
unaggregated_attestations = self.get_ready_attestations(slot, False)
ready_attestations = aggregated_attestations + unaggregated_attestations
private_key = self.validator_privkeys[proposer_index]
randao_reveal = generate_randao_reveal(
private_key, slot, state, state_machine.config
)
block = create_block_proposal(
slot,
head_block.message.hash_tree_root,
randao_reveal,
eth1_vote,
ready_attestations,
state,
state_machine,
)
block = sign_block(state, block, private_key, self.slots_per_epoch)
self.logger.debug(
bold_green("validator %s is proposing a block %s with attestations %s"),
proposer_index,
block,
block.body.attestations,
)
self.chain.import_block(block)
self.logger.debug("broadcasting block %s", block)
await self.p2p_node.broadcast_beacon_block(block)
metrics.validator_proposed_blocks.inc()
return block
def test_get_attestation_root(valid_chain, genesis_block, genesis_state,
keymap, min_attestation_inclusion_delay):
state_machine = valid_chain.get_state_machine()
config = state_machine.config
attestations = create_mock_signed_attestations_at_slot(
state=genesis_state,
config=config,
state_machine=state_machine,
attestation_slot=genesis_block.slot,
beacon_block_root=genesis_block.message.hash_tree_root,
keymap=keymap,
)
state = genesis_state
slot = genesis_state.slot + 1
future_state, _ = state_machine.apply_state_transition(state,
future_slot=slot)
proposer_index = get_beacon_proposer_index(future_state, config)
proposer = state.validators[proposer_index].pubkey
private_key = keymap[proposer]
randao_reveal = generate_randao_reveal(private_key, slot, state, config)
block = create_block(
slot,
genesis_block.message.hash_tree_root,
randao_reveal,
state.eth1_data,
attestations,
state,
state_machine,
private_key,
)
valid_chain.import_block(block)
# Only one attestation in attestations, so just check that one
a0 = attestations[0]
assert valid_chain.get_attestation_by_root(a0.hash_tree_root) == a0
assert valid_chain.attestation_exists(a0.hash_tree_root)
fake_attestation = a0.set("signature", b"\x78" * 96)
with pytest.raises(AttestationRootNotFound):
valid_chain.get_attestation_by_root(fake_attestation.hash_tree_root)
assert not valid_chain.attestation_exists(fake_attestation.hash_tree_root)
def test_demo(base_db, validator_count, keymap, pubkeys, fork_choice_scoring):
bls.use_noop_backend()
config = MINIMAL_SERENITY_CONFIG
override_lengths(config)
genesis_slot = GENESIS_SLOT
genesis_epoch = GENESIS_EPOCH
genesis_state, genesis_block = create_mock_genesis(
pubkeys=pubkeys[:validator_count],
config=config,
keymap=keymap,
genesis_block_class=SerenityBeaconBlock,
)
chaindb = BeaconChainDB.from_genesis(
base_db, genesis_state, SerenitySignedBeaconBlock, fork_choice_scoring
)
fixture_sm = SkeletonLakeStateMachine(chaindb)
for i in range(validator_count):
assert genesis_state.validators[i].is_active(genesis_slot)
state = genesis_state
block = SerenitySignedBeaconBlock.create(message=genesis_block)
chain_length = 4 * config.SLOTS_PER_EPOCH
blocks = (block,)
attestations_map = {} # Dict[Slot, Sequence[Attestation]]
for current_slot in range(genesis_slot + 1, genesis_slot + chain_length + 1):
if current_slot > genesis_slot + config.MIN_ATTESTATION_INCLUSION_DELAY:
attestations = attestations_map[
current_slot - config.MIN_ATTESTATION_INCLUSION_DELAY
]
else:
attestations = ()
future_state, _ = fixture_sm.apply_state_transition(
state, future_slot=current_slot
)
proposer_index = get_beacon_proposer_index(future_state, config)
proposer_pubkey = state.validators[proposer_index].pubkey
private_key = keymap[proposer_pubkey]
randao_reveal = generate_randao_reveal(private_key, current_slot, state, config)
block_proposal = create_block_proposal(
current_slot,
block.message.hash_tree_root,
randao_reveal,
state.eth1_data,
attestations,
state,
fixture_sm,
)
block = sign_block(state, block_proposal, private_key, config.SLOTS_PER_EPOCH)
state, block = fixture_sm.apply_state_transition(state, block)
chaindb.persist_state(state)
chaindb.persist_block(block, SerenitySignedBeaconBlock, fork_choice_scoring)
blocks += (block,)
# Mock attestations
attestation_slot = current_slot
attestations = create_mock_signed_attestations_at_slot(
state=state,
config=config,
state_machine=fixture_sm,
attestation_slot=attestation_slot,
beacon_block_root=block.message.hash_tree_root,
keymap=keymap,
voted_attesters_ratio=1.0,
)
attestations_map[attestation_slot] = attestations
assert state.slot == chain_length + genesis_slot
# Justification assertions
# NOTE: why are the number `2` or `3` used in the checks below?
# Answer:
# "We do not check any justification and finality during epochs 0 or 1. We do check for
# justification and finality from epoch 2 onward."
# [epoch 0]------[epoch 1]------>
#
# "In epoch 2, we justify the current epoch. This epoch is in fact justified but we do not
# recognize it in the protocol due to an artifact of the construction of the genesis state
# (using the `zero` value for `Checkpoint` type)."
# [epoch 0]------[epoch 1]------[epoch 2]*------>
# []*: checkpoint justified
# []**: checkpoint finalized
#
# "In epoch 3, we have the previous justified checkpoint at the prior current justified
# checkpoint (so `GENESIS_EPOCH + 2`) and we justify this current epoch. we check finality here
# and see that we finalize the prior justified checkpoint at epoch 2."
# [epoch 0]------[epoch 1]------[epoch 2]**------[epoch 3]*------>
#
# "Given the way we handle epoch processing (i.e. process a given epoch at the start of
# the next epoch), we need to transition through `4 * SLOTS_PER_EPOCH` worth of slots to
# include the processing of epoch 3."
#
# source: https://github.com/ethereum/trinity/pull/1214#issuecomment-546184080
#
# epoch | prev_justified_checkpoint | cur_justified_checkpoint | finalized_checkpoint
# ------|---------------------------|--------------------------|---------------------
# 0 | 0 | 0 | 0
# 1 | 0 | 0 | 0
# 2 | 0 | 0 | 0
# 3 | 0 | 2 | 0
# 4 | 2 | 3 | 2
assert state.previous_justified_checkpoint.epoch == 2 + genesis_epoch
assert state.current_justified_checkpoint.epoch == 3 + genesis_epoch
assert state.finalized_checkpoint.epoch == 2 + genesis_epoch