426 lines
14 KiB
Python
426 lines
14 KiB
Python
from copy import deepcopy
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import pytest
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from py_ecc import bls
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import build.phase0.spec as spec
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from build.phase0.utils.minimal_ssz import signed_root
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from build.phase0.spec import (
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# constants
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EMPTY_SIGNATURE,
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ZERO_HASH,
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# SSZ
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Deposit,
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Transfer,
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VoluntaryExit,
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# functions
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get_active_validator_indices,
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get_balance,
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get_block_root,
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get_current_epoch,
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get_domain,
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get_state_root,
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advance_slot,
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cache_state,
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set_balance,
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verify_merkle_branch,
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hash,
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)
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from build.phase0.state_transition import (
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state_transition,
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)
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from build.phase0.utils.merkle_minimal import (
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calc_merkle_tree_from_leaves,
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get_merkle_proof,
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get_merkle_root,
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)
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from tests.phase0.helpers import (
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build_deposit_data,
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build_empty_block_for_next_slot,
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force_registry_change_at_next_epoch,
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get_valid_attestation,
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get_valid_proposer_slashing,
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privkeys,
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pubkeys,
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)
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# mark entire file as 'sanity'
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pytestmark = pytest.mark.sanity
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def test_slot_transition(state):
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test_state = deepcopy(state)
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cache_state(test_state)
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advance_slot(test_state)
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assert test_state.slot == state.slot + 1
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assert get_state_root(test_state, state.slot) == state.hash_tree_root()
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return test_state
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def test_empty_block_transition(state):
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test_state = deepcopy(state)
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block = build_empty_block_for_next_slot(test_state)
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state_transition(test_state, block)
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assert len(test_state.eth1_data_votes) == len(state.eth1_data_votes) + 1
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assert get_block_root(test_state, state.slot) == block.previous_block_root
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return state, [block], test_state
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def test_skipped_slots(state):
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test_state = deepcopy(state)
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block = build_empty_block_for_next_slot(test_state)
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block.slot += 3
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state_transition(test_state, block)
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assert test_state.slot == block.slot
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for slot in range(state.slot, test_state.slot):
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assert get_block_root(test_state, slot) == block.previous_block_root
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return state, [block], test_state
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def test_empty_epoch_transition(state):
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test_state = deepcopy(state)
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block = build_empty_block_for_next_slot(test_state)
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block.slot += spec.SLOTS_PER_EPOCH
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state_transition(test_state, block)
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assert test_state.slot == block.slot
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for slot in range(state.slot, test_state.slot):
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assert get_block_root(test_state, slot) == block.previous_block_root
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return state, [block], test_state
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def test_empty_epoch_transition_not_finalizing(state):
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test_state = deepcopy(state)
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block = build_empty_block_for_next_slot(test_state)
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block.slot += spec.SLOTS_PER_EPOCH * 5
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state_transition(test_state, block)
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assert test_state.slot == block.slot
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assert test_state.finalized_epoch < get_current_epoch(test_state) - 4
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for index in range(len(test_state.validator_registry)):
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assert get_balance(test_state, index) < get_balance(state, index)
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return state, [block], test_state
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def test_proposer_slashing(state):
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test_state = deepcopy(state)
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proposer_slashing = get_valid_proposer_slashing(state)
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validator_index = proposer_slashing.proposer_index
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#
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# Add to state via block transition
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#
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block = build_empty_block_for_next_slot(test_state)
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block.body.proposer_slashings.append(proposer_slashing)
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state_transition(test_state, block)
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assert not state.validator_registry[validator_index].initiated_exit
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assert not state.validator_registry[validator_index].slashed
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slashed_validator = test_state.validator_registry[validator_index]
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assert not slashed_validator.initiated_exit
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assert slashed_validator.slashed
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assert slashed_validator.exit_epoch < spec.FAR_FUTURE_EPOCH
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assert slashed_validator.withdrawable_epoch < spec.FAR_FUTURE_EPOCH
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# lost whistleblower reward
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assert get_balance(test_state, validator_index) < get_balance(state, validator_index)
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return state, [block], test_state
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def test_deposit_in_block(state):
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pre_state = deepcopy(state)
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test_deposit_data_leaves = [ZERO_HASH] * len(pre_state.validator_registry)
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index = len(test_deposit_data_leaves)
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pubkey = pubkeys[index]
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privkey = privkeys[index]
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deposit_data = build_deposit_data(pre_state, pubkey, privkey, spec.MAX_DEPOSIT_AMOUNT)
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item = hash(deposit_data.serialize())
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test_deposit_data_leaves.append(item)
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tree = calc_merkle_tree_from_leaves(tuple(test_deposit_data_leaves))
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root = get_merkle_root((tuple(test_deposit_data_leaves)))
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proof = list(get_merkle_proof(tree, item_index=index))
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assert verify_merkle_branch(item, proof, spec.DEPOSIT_CONTRACT_TREE_DEPTH, index, root)
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deposit = Deposit(
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proof=list(proof),
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index=index,
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data=deposit_data,
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)
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pre_state.latest_eth1_data.deposit_root = root
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pre_state.latest_eth1_data.deposit_count = len(test_deposit_data_leaves)
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post_state = deepcopy(pre_state)
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block = build_empty_block_for_next_slot(post_state)
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block.body.deposits.append(deposit)
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state_transition(post_state, block)
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assert len(post_state.validator_registry) == len(state.validator_registry) + 1
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assert len(post_state.balances) == len(state.balances) + 1
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assert get_balance(post_state, index) == spec.MAX_DEPOSIT_AMOUNT
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assert post_state.validator_registry[index].pubkey == pubkeys[index]
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return pre_state, [block], post_state
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def test_deposit_top_up(state):
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pre_state = deepcopy(state)
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test_deposit_data_leaves = [ZERO_HASH] * len(pre_state.validator_registry)
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validator_index = 0
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amount = spec.MAX_DEPOSIT_AMOUNT // 4
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pubkey = pubkeys[validator_index]
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privkey = privkeys[validator_index]
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deposit_data = build_deposit_data(pre_state, pubkey, privkey, amount)
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merkle_index = len(test_deposit_data_leaves)
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item = hash(deposit_data.serialize())
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test_deposit_data_leaves.append(item)
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tree = calc_merkle_tree_from_leaves(tuple(test_deposit_data_leaves))
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root = get_merkle_root((tuple(test_deposit_data_leaves)))
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proof = list(get_merkle_proof(tree, item_index=merkle_index))
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assert verify_merkle_branch(item, proof, spec.DEPOSIT_CONTRACT_TREE_DEPTH, merkle_index, root)
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deposit = Deposit(
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proof=list(proof),
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index=merkle_index,
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data=deposit_data,
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)
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pre_state.latest_eth1_data.deposit_root = root
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pre_state.latest_eth1_data.deposit_count = len(test_deposit_data_leaves)
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block = build_empty_block_for_next_slot(pre_state)
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block.body.deposits.append(deposit)
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pre_balance = get_balance(pre_state, validator_index)
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post_state = deepcopy(pre_state)
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state_transition(post_state, block)
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assert len(post_state.validator_registry) == len(pre_state.validator_registry)
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assert len(post_state.balances) == len(pre_state.balances)
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assert get_balance(post_state, validator_index) == pre_balance + amount
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return pre_state, [block], post_state
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def test_attestation(state):
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test_state = deepcopy(state)
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attestation = get_valid_attestation(state)
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#
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# Add to state via block transition
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#
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attestation_block = build_empty_block_for_next_slot(test_state)
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attestation_block.slot += spec.MIN_ATTESTATION_INCLUSION_DELAY
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attestation_block.body.attestations.append(attestation)
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state_transition(test_state, attestation_block)
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assert len(test_state.current_epoch_attestations) == len(state.current_epoch_attestations) + 1
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#
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# Epoch transition should move to previous_epoch_attestations
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#
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pre_current_epoch_attestations = deepcopy(test_state.current_epoch_attestations)
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epoch_block = build_empty_block_for_next_slot(test_state)
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epoch_block.slot += spec.SLOTS_PER_EPOCH
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state_transition(test_state, epoch_block)
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assert len(test_state.current_epoch_attestations) == 0
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assert test_state.previous_epoch_attestations == pre_current_epoch_attestations
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return state, [attestation_block, epoch_block], test_state
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def test_voluntary_exit(state):
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pre_state = deepcopy(state)
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validator_index = get_active_validator_indices(
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pre_state.validator_registry,
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get_current_epoch(pre_state)
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)[-1]
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# move state forward PERSISTENT_COMMITTEE_PERIOD epochs to allow for exit
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pre_state.slot += spec.PERSISTENT_COMMITTEE_PERIOD * spec.SLOTS_PER_EPOCH
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# artificially trigger registry update at next epoch transition
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force_registry_change_at_next_epoch(pre_state)
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post_state = deepcopy(pre_state)
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voluntary_exit = VoluntaryExit(
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epoch=get_current_epoch(pre_state),
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validator_index=validator_index,
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signature=EMPTY_SIGNATURE,
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)
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voluntary_exit.signature = bls.sign(
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message_hash=signed_root(voluntary_exit),
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privkey=privkeys[validator_index],
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domain=get_domain(
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fork=pre_state.fork,
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epoch=get_current_epoch(pre_state),
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domain_type=spec.DOMAIN_VOLUNTARY_EXIT,
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)
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)
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#
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# Add to state via block transition
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#
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initiate_exit_block = build_empty_block_for_next_slot(post_state)
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initiate_exit_block.body.voluntary_exits.append(voluntary_exit)
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state_transition(post_state, initiate_exit_block)
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assert not pre_state.validator_registry[validator_index].initiated_exit
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assert post_state.validator_registry[validator_index].initiated_exit
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assert post_state.validator_registry[validator_index].exit_epoch == spec.FAR_FUTURE_EPOCH
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#
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# Process within epoch transition
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#
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exit_block = build_empty_block_for_next_slot(post_state)
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exit_block.slot += spec.SLOTS_PER_EPOCH
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state_transition(post_state, exit_block)
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assert post_state.validator_registry[validator_index].exit_epoch < spec.FAR_FUTURE_EPOCH
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return pre_state, [initiate_exit_block, exit_block], post_state
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def test_no_exit_churn_too_long_since_change(state):
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pre_state = deepcopy(state)
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validator_index = get_active_validator_indices(
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pre_state.validator_registry,
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get_current_epoch(pre_state)
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)[-1]
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#
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# setup pre_state
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#
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# move state forward PERSISTENT_COMMITTEE_PERIOD epochs to allow for exit
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pre_state.slot += spec.PERSISTENT_COMMITTEE_PERIOD * spec.SLOTS_PER_EPOCH
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# artificially trigger registry update at next epoch transition
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force_registry_change_at_next_epoch(pre_state)
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# make epochs since registry update greater than LATEST_SLASHED_EXIT_LENGTH
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pre_state.validator_registry_update_epoch = (
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get_current_epoch(pre_state) - spec.LATEST_SLASHED_EXIT_LENGTH
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)
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# set validator to have previously initiated exit
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pre_state.validator_registry[validator_index].initiated_exit = True
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post_state = deepcopy(pre_state)
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#
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# Process registry change but ensure no exit
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#
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block = build_empty_block_for_next_slot(post_state)
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block.slot += spec.SLOTS_PER_EPOCH
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state_transition(post_state, block)
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assert post_state.validator_registry_update_epoch == get_current_epoch(post_state) - 1
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assert post_state.validator_registry[validator_index].exit_epoch == spec.FAR_FUTURE_EPOCH
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return pre_state, [block], post_state
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def test_transfer(state):
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pre_state = deepcopy(state)
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current_epoch = get_current_epoch(pre_state)
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sender_index = get_active_validator_indices(pre_state.validator_registry, current_epoch)[-1]
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recipient_index = get_active_validator_indices(pre_state.validator_registry, current_epoch)[0]
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transfer_pubkey = pubkeys[-1]
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transfer_privkey = privkeys[-1]
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amount = get_balance(pre_state, sender_index)
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pre_transfer_recipient_balance = get_balance(pre_state, recipient_index)
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transfer = Transfer(
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sender=sender_index,
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recipient=recipient_index,
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amount=amount,
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fee=0,
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slot=pre_state.slot + 1,
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pubkey=transfer_pubkey,
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signature=EMPTY_SIGNATURE,
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)
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transfer.signature = bls.sign(
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message_hash=signed_root(transfer),
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privkey=transfer_privkey,
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domain=get_domain(
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fork=pre_state.fork,
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epoch=get_current_epoch(pre_state),
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domain_type=spec.DOMAIN_TRANSFER,
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)
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)
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# ensure withdrawal_credentials reproducable
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pre_state.validator_registry[sender_index].withdrawal_credentials = (
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spec.BLS_WITHDRAWAL_PREFIX_BYTE + hash(transfer_pubkey)[1:]
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)
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# un-activate so validator can transfer
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pre_state.validator_registry[sender_index].activation_epoch = spec.FAR_FUTURE_EPOCH
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post_state = deepcopy(pre_state)
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#
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# Add to state via block transition
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#
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block = build_empty_block_for_next_slot(post_state)
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block.body.transfers.append(transfer)
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state_transition(post_state, block)
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sender_balance = get_balance(post_state, sender_index)
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recipient_balance = get_balance(post_state, recipient_index)
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assert sender_balance == 0
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assert recipient_balance == pre_transfer_recipient_balance + amount
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return pre_state, [block], post_state
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def test_ejection(state):
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pre_state = deepcopy(state)
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current_epoch = get_current_epoch(pre_state)
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validator_index = get_active_validator_indices(pre_state.validator_registry, current_epoch)[-1]
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assert pre_state.validator_registry[validator_index].exit_epoch == spec.FAR_FUTURE_EPOCH
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# set validator balance to below ejection threshold
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set_balance(pre_state, validator_index, spec.EJECTION_BALANCE - 1)
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post_state = deepcopy(pre_state)
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#
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# trigger epoch transition
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#
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block = build_empty_block_for_next_slot(post_state)
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block.slot += spec.SLOTS_PER_EPOCH
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state_transition(post_state, block)
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assert post_state.validator_registry[validator_index].initiated_exit == True
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return pre_state, [block], post_state
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def test_historical_batch(state):
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pre_state = deepcopy(state)
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pre_state.slot += spec.SLOTS_PER_HISTORICAL_ROOT - (pre_state.slot % spec.SLOTS_PER_HISTORICAL_ROOT) - 1
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post_state = deepcopy(pre_state)
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block = build_empty_block_for_next_slot(post_state)
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state_transition(post_state, block)
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assert post_state.slot == block.slot
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assert get_current_epoch(post_state) % (spec.SLOTS_PER_HISTORICAL_ROOT // spec.SLOTS_PER_EPOCH) == 0
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assert len(post_state.historical_roots) == len(pre_state.historical_roots) + 1
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return pre_state, [block], post_state
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