199 lines
7.6 KiB
Python
199 lines
7.6 KiB
Python
from copy import deepcopy
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import pytest
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import eth2spec.phase0.spec as spec
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from eth2spec.phase0.state_transition import (
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state_transition,
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)
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from .helpers import (
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build_empty_block_for_next_slot,
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fill_aggregate_attestation,
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get_current_epoch,
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get_epoch_start_slot,
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get_valid_attestation,
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next_epoch,
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)
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# mark entire file as 'state'
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pytestmark = pytest.mark.state
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def check_finality(state,
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prev_state,
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current_justified_changed,
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previous_justified_changed,
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finalized_changed):
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if current_justified_changed:
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assert state.current_justified_epoch > prev_state.current_justified_epoch
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assert state.current_justified_root != prev_state.current_justified_root
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else:
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assert state.current_justified_epoch == prev_state.current_justified_epoch
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assert state.current_justified_root == prev_state.current_justified_root
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if previous_justified_changed:
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assert state.previous_justified_epoch > prev_state.previous_justified_epoch
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assert state.previous_justified_root != prev_state.previous_justified_root
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else:
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assert state.previous_justified_epoch == prev_state.previous_justified_epoch
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assert state.previous_justified_root == prev_state.previous_justified_root
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if finalized_changed:
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assert state.finalized_epoch > prev_state.finalized_epoch
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assert state.finalized_root != prev_state.finalized_root
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else:
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assert state.finalized_epoch == prev_state.finalized_epoch
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assert state.finalized_root == prev_state.finalized_root
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def next_epoch_with_attestations(state,
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fill_cur_epoch,
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fill_prev_epoch):
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post_state = deepcopy(state)
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blocks = []
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for slot in range(spec.SLOTS_PER_EPOCH):
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block = build_empty_block_for_next_slot(post_state)
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if fill_cur_epoch:
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slot_to_attest = post_state.slot - spec.MIN_ATTESTATION_INCLUSION_DELAY + 1
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if slot_to_attest >= get_epoch_start_slot(get_current_epoch(post_state)):
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cur_attestation = get_valid_attestation(post_state, slot_to_attest)
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fill_aggregate_attestation(post_state, cur_attestation)
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block.body.attestations.append(cur_attestation)
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if fill_prev_epoch:
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slot_to_attest = post_state.slot - spec.SLOTS_PER_EPOCH + 1
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prev_attestation = get_valid_attestation(post_state, slot_to_attest)
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fill_aggregate_attestation(post_state, prev_attestation)
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block.body.attestations.append(prev_attestation)
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state_transition(post_state, block)
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blocks.append(block)
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return state, blocks, post_state
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def test_finality_rule_4(state):
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test_state = deepcopy(state)
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blocks = []
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for epoch in range(4):
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prev_state, new_blocks, test_state = next_epoch_with_attestations(test_state, True, False)
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blocks += new_blocks
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# justification/finalization skipped at GENESIS_EPOCH
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if epoch == 0:
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check_finality(test_state, prev_state, False, False, False)
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# justification/finalization skipped at GENESIS_EPOCH + 1
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elif epoch == 1:
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check_finality(test_state, prev_state, False, False, False)
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elif epoch == 2:
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check_finality(test_state, prev_state, True, False, False)
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elif epoch >= 3:
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# rule 4 of finality
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check_finality(test_state, prev_state, True, True, True)
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assert test_state.finalized_epoch == prev_state.current_justified_epoch
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assert test_state.finalized_root == prev_state.current_justified_root
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return state, blocks, test_state
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def test_finality_rule_1(state):
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# get past first two epochs that finality does not run on
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next_epoch(state)
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next_epoch(state)
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pre_state = deepcopy(state)
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test_state = deepcopy(state)
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blocks = []
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for epoch in range(3):
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prev_state, new_blocks, test_state = next_epoch_with_attestations(test_state, False, True)
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blocks += new_blocks
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if epoch == 0:
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check_finality(test_state, prev_state, True, False, False)
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elif epoch == 1:
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check_finality(test_state, prev_state, True, True, False)
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elif epoch == 2:
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# finalized by rule 1
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check_finality(test_state, prev_state, True, True, True)
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assert test_state.finalized_epoch == prev_state.previous_justified_epoch
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assert test_state.finalized_root == prev_state.previous_justified_root
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return pre_state, blocks, test_state
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def test_finality_rule_2(state):
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# get past first two epochs that finality does not run on
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next_epoch(state)
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next_epoch(state)
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pre_state = deepcopy(state)
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test_state = deepcopy(state)
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blocks = []
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for epoch in range(3):
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if epoch == 0:
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prev_state, new_blocks, test_state = next_epoch_with_attestations(test_state, True, False)
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check_finality(test_state, prev_state, True, False, False)
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elif epoch == 1:
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prev_state, new_blocks, test_state = next_epoch_with_attestations(test_state, False, False)
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check_finality(test_state, prev_state, False, True, False)
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elif epoch == 2:
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prev_state, new_blocks, test_state = next_epoch_with_attestations(test_state, False, True)
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# finalized by rule 2
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check_finality(test_state, prev_state, True, False, True)
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assert test_state.finalized_epoch == prev_state.previous_justified_epoch
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assert test_state.finalized_root == prev_state.previous_justified_root
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blocks += new_blocks
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return pre_state, blocks, test_state
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def test_finality_rule_3(state):
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"""
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Test scenario described here
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https://github.com/ethereum/eth2.0-specs/issues/611#issuecomment-463612892
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"""
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# get past first two epochs that finality does not run on
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next_epoch(state)
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next_epoch(state)
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pre_state = deepcopy(state)
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test_state = deepcopy(state)
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blocks = []
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prev_state, new_blocks, test_state = next_epoch_with_attestations(test_state, True, False)
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blocks += new_blocks
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check_finality(test_state, prev_state, True, False, False)
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# In epoch N, JE is set to N, prev JE is set to N-1
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prev_state, new_blocks, test_state = next_epoch_with_attestations(test_state, True, False)
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blocks += new_blocks
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check_finality(test_state, prev_state, True, True, True)
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# In epoch N+1, JE is N, prev JE is N-1, and not enough messages get in to do anything
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prev_state, new_blocks, test_state = next_epoch_with_attestations(test_state, False, False)
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blocks += new_blocks
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check_finality(test_state, prev_state, False, True, False)
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# In epoch N+2, JE is N, prev JE is N, and enough messages from the previous epoch get in to justify N+1.
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# N+1 now becomes the JE. Not enough messages from epoch N+2 itself get in to justify N+2
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prev_state, new_blocks, test_state = next_epoch_with_attestations(test_state, False, True)
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blocks += new_blocks
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# rule 2
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check_finality(test_state, prev_state, True, False, True)
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# In epoch N+3, LJE is N+1, prev LJE is N, and enough messages get in to justify epochs N+2 and N+3.
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prev_state, new_blocks, test_state = next_epoch_with_attestations(test_state, True, True)
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blocks += new_blocks
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# rule 3
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check_finality(test_state, prev_state, True, True, True)
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assert test_state.finalized_epoch == prev_state.current_justified_epoch
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assert test_state.finalized_root == prev_state.current_justified_root
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return pre_state, blocks, test_state
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