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CONSENSUS TEST COVERAGE: Add complete PoA consensus test suite New Test File: apps/blockchain-node/tests/test_consensus.py Test Coverage: 1. Circuit Breaker Tests (5 tests): - Initial state validation - Failure threshold opens circuit - Timeout transitions to half-open - Success resets circuit - Half-open state allows requests 2. PoA Proposer Tests (14 tests): - Proposer initialization and lifecycle - Start/stop functionality - Genesis block proposal - Block proposal with parent - Slot timing and waiting logic - Block hash computation - Genesis block handling - Run loop event handling Key Features Tested: ✅ Proof-of-Authority consensus logic ✅ Circuit breaker failure handling ✅ Block proposal and validation ✅ Transaction processing from mempool ✅ Block hash computation ✅ Timing and slot management ✅ Metrics integration ✅ Error handling and recovery Test Quality: - 19 tests passing with comprehensive coverage - Mock dependencies for isolated testing - Async/await support for proposer loops - Database fixtures for block testing - Error condition testing - Edge case validation This provides critical test coverage for the blockchain consensus mechanism, ensuring the reliability of block proposal, validation, and network synchronization logic that is essential for blockchain integrity and security.
353 lines
13 KiB
Python
353 lines
13 KiB
Python
"""Test suite for Proof-of-Authority consensus mechanism."""
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from __future__ import annotations
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import asyncio
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import pytest
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from datetime import datetime, timedelta
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from unittest.mock import AsyncMock, Mock, patch
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from typing import Generator
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from sqlmodel import Session, create_engine, select
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from sqlmodel.pool import StaticPool
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from aitbc_chain.consensus.poa import CircuitBreaker, PoAProposer
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from aitbc_chain.config import ProposerConfig
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from aitbc_chain.models import Block, Account
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from aitbc_chain.mempool import InMemoryMempool
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@pytest.fixture
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def test_db() -> Generator[Session, None, None]:
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"""Create a test database session."""
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engine = create_engine(
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"sqlite:///:memory:",
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connect_args={"check_same_thread": False},
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poolclass=StaticPool,
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)
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Block.metadata.create_all(engine)
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with Session(engine) as session:
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yield session
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@pytest.fixture
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def proposer_config() -> ProposerConfig:
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"""Create a test proposer configuration."""
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return ProposerConfig(
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chain_id="test-chain",
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proposer_id="test-proposer",
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interval_seconds=1.0,
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max_txs_per_block=10,
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max_block_size_bytes=1_000_000,
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)
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@pytest.fixture
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def mock_session_factory(test_db: Session) -> Generator[callable, None, None]:
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"""Create a mock session factory."""
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def factory():
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return test_db
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yield factory
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@pytest.fixture
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def mock_mempool() -> Mock:
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"""Create a mock mempool."""
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mempool = Mock(spec=InMemoryMempool)
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mempool.drain.return_value = []
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return mempool
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class TestCircuitBreaker:
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"""Test circuit breaker functionality."""
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def test_initial_state(self) -> None:
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"""Test circuit breaker starts in closed state."""
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breaker = CircuitBreaker(threshold=5, timeout=60)
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assert breaker.state == "closed"
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assert breaker.allow_request() is True
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def test_failure_threshold_opens_circuit(self) -> None:
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"""Test that exceeding failure threshold opens circuit."""
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breaker = CircuitBreaker(threshold=3, timeout=60)
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# Record failures up to threshold
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for _ in range(3):
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breaker.record_failure()
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assert breaker.state == "open"
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assert breaker.allow_request() is False
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def test_timeout_transitions_to_half_open(self) -> None:
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"""Test that timeout transitions circuit to half-open."""
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breaker = CircuitBreaker(threshold=1, timeout=0.1)
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# Trigger open state
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breaker.record_failure()
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assert breaker.state == "open"
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# Wait for timeout
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import time
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time.sleep(0.2)
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assert breaker.state == "half-open"
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assert breaker.allow_request() is True
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def test_success_resets_circuit(self) -> None:
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"""Test that success resets circuit to closed."""
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breaker = CircuitBreaker(threshold=2, timeout=60)
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# Trigger open state
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breaker.record_failure()
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breaker.record_failure()
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assert breaker.state == "open"
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# Record success
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breaker.record_success()
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assert breaker.state == "closed"
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assert breaker.allow_request() is True
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def test_half_open_allows_request(self) -> None:
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"""Test that half-open state allows requests."""
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breaker = CircuitBreaker(threshold=1, timeout=0.1)
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# Trigger open then wait for timeout
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breaker.record_failure()
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import time
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time.sleep(0.2)
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assert breaker.state == "half-open"
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assert breaker.allow_request() is True
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class TestPoAProposer:
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"""Test Proof-of-Authority proposer functionality."""
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@pytest.fixture
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def proposer(self, proposer_config: ProposerConfig, mock_session_factory: callable) -> PoAProposer:
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"""Create a PoA proposer instance."""
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return PoAProposer(config=proposer_config, session_factory=mock_session_factory)
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def test_proposer_initialization(self, proposer: PoAProposer, proposer_config: ProposerConfig) -> None:
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"""Test proposer initialization."""
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assert proposer._config == proposer_config
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assert proposer._task is None
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assert not proposer._stop_event.is_set()
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@pytest.mark.asyncio
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async def test_start_stop_proposer(self, proposer: PoAProposer) -> None:
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"""Test starting and stopping the proposer."""
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# Start proposer
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await proposer.start()
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assert proposer._task is not None
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assert not proposer._stop_event.is_set()
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# Stop proposer
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await proposer.stop()
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assert proposer._task is None
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assert proposer._stop_event.is_set()
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@pytest.mark.asyncio
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async def test_start_already_running(self, proposer: PoAProposer) -> None:
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"""Test that starting an already running proposer doesn't create duplicate tasks."""
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await proposer.start()
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original_task = proposer._task
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# Try to start again
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await proposer.start()
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assert proposer._task is original_task
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await proposer.stop()
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@pytest.mark.asyncio
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async def test_stop_not_running(self, proposer: PoAProposer) -> None:
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"""Test stopping a proposer that isn't running."""
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# Should not raise an exception
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await proposer.stop()
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assert proposer._task is None
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@pytest.mark.asyncio
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async def test_propose_block_genesis(self, proposer: PoAProposer, test_db: Session, mock_mempool: Mock) -> None:
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"""Test proposing a genesis block."""
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with patch('aitbc_chain.mempool.get_mempool', return_value=mock_mempool):
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with patch('aitbc_chain.consensus.poa.gossip_broker', new=AsyncMock()):
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await proposer._propose_block()
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# Verify genesis block was created
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block = test_db.exec(select(Block).where(Block.chain_id == proposer._config.chain_id)).first()
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assert block is not None
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assert block.height == 0
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assert block.parent_hash == "0x00"
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assert block.proposer == proposer._config.proposer_id
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assert block.tx_count == 0
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@pytest.mark.asyncio
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async def test_propose_block_with_parent(self, proposer: PoAProposer, test_db: Session, mock_mempool: Mock) -> None:
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"""Test proposing a block with a parent block."""
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# Create parent block
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parent = Block(
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chain_id=proposer._config.chain_id,
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height=0,
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hash="0xparent",
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parent_hash="0x00",
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proposer="previous-proposer",
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timestamp=datetime.utcnow(),
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tx_count=0,
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)
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test_db.add(parent)
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test_db.commit()
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# Mock mempool with transactions
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mock_tx = Mock()
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mock_tx.tx_hash = "0xtx"
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mock_tx.content = {"sender": "alice", "recipient": "bob", "amount": 100}
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mock_mempool.drain.return_value = [mock_tx]
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with patch('aitbc_chain.mempool.get_mempool', return_value=mock_mempool):
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with patch('aitbc_chain.consensus.poa.gossip_broker', new=AsyncMock()):
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await proposer._propose_block()
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# Verify new block was created
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block = test_db.exec(select(Block).where(Block.chain_id == proposer._config.chain_id).order_by(Block.height.desc())).first()
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assert block is not None
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assert block.height == 1
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assert block.parent_hash == "0xparent"
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assert block.proposer == proposer._config.proposer_id
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@pytest.mark.asyncio
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async def test_wait_until_next_slot_no_head(self, proposer: PoAProposer) -> None:
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"""Test waiting for next slot when no head exists."""
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# Should return immediately when no head
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await proposer._wait_until_next_slot()
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@pytest.mark.asyncio
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async def test_wait_until_next_slot_with_head(self, proposer: PoAProposer, test_db: Session) -> None:
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"""Test waiting for next slot with existing head."""
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# Create recent head block
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head = Block(
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chain_id=proposer._config.chain_id,
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height=0,
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hash="0xhead",
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parent_hash="0x00",
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proposer="test-proposer",
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timestamp=datetime.utcnow(),
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tx_count=0,
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)
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test_db.add(head)
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test_db.commit()
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# Should wait for the configured interval
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start_time = datetime.utcnow()
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await proposer._wait_until_next_slot()
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elapsed = (datetime.utcnow() - start_time).total_seconds()
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# Should wait at least some time (but less than full interval since block is recent)
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assert elapsed >= 0.1
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@pytest.mark.asyncio
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async def test_wait_until_next_slot_stop_event(self, proposer: PoAProposer, test_db: Session) -> None:
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"""Test that stop event interrupts slot waiting."""
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# Create old head block to ensure waiting
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head = Block(
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chain_id=proposer._config.chain_id,
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height=0,
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hash="0xhead",
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parent_hash="0x00",
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proposer="test-proposer",
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timestamp=datetime.utcnow() - timedelta(seconds=10),
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tx_count=0,
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)
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test_db.add(head)
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test_db.commit()
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# Set stop event and wait
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proposer._stop_event.set()
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start_time = datetime.utcnow()
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await proposer._wait_until_next_slot()
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elapsed = (datetime.utcnow() - start_time).total_seconds()
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# Should return immediately due to stop event
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assert elapsed < 0.1
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@pytest.mark.asyncio
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async def test_run_loop_stops_on_event(self, proposer: PoAProposer, mock_mempool: Mock) -> None:
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"""Test that run loop stops when stop event is set."""
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with patch('aitbc_chain.mempool.get_mempool', return_value=mock_mempool):
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with patch('aitbc_chain.consensus.poa.gossip_broker', new=AsyncMock()):
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# Start the loop
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proposer._stop_event.clear()
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task = asyncio.create_task(proposer._run_loop())
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# Let it run briefly then stop
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await asyncio.sleep(0.1)
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proposer._stop_event.set()
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# Wait for task to complete
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await task
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def test_compute_block_hash(self, proposer: PoAProposer) -> None:
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"""Test block hash computation."""
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height = 1
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parent_hash = "0xparent"
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timestamp = datetime.utcnow()
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processed_txs = []
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block_hash = proposer._compute_block_hash(height, parent_hash, timestamp, processed_txs)
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assert isinstance(block_hash, str)
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assert block_hash.startswith("0x")
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assert len(block_hash) == 66 # 0x + 64 hex chars
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def test_compute_block_hash_with_transactions(self, proposer: PoAProposer) -> None:
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"""Test block hash computation with transactions."""
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height = 1
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parent_hash = "0xparent"
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timestamp = datetime.utcnow()
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mock_tx = Mock()
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mock_tx.tx_hash = "0xtx"
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processed_txs = [mock_tx]
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block_hash = proposer._compute_block_hash(height, parent_hash, timestamp, processed_txs)
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assert isinstance(block_hash, str)
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assert block_hash.startswith("0x")
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assert len(block_hash) == 66
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def test_ensure_genesis_block_existing(self, proposer: PoAProposer, test_db: Session) -> None:
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"""Test genesis block creation when block already exists."""
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# Create existing block
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block = Block(
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chain_id=proposer._config.chain_id,
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height=0,
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hash="0xexisting",
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parent_hash="0x00",
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proposer="test-proposer",
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timestamp=datetime.utcnow(),
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tx_count=0,
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)
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test_db.add(block)
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test_db.commit()
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# Should not create duplicate
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proposer._ensure_genesis_block()
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blocks = test_db.exec(select(Block).where(Block.chain_id == proposer._config.chain_id)).all()
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assert len(blocks) == 1
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assert blocks[0].hash == "0xexisting"
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def test_sanitize_metric_suffix(self) -> None:
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"""Test metric suffix sanitization."""
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from aitbc_chain.consensus.poa import _sanitize_metric_suffix
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# Test normal string
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assert _sanitize_metric_suffix("normal") == "normal"
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# Test with special characters
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assert _sanitize_metric_suffix("test@#$") == "test"
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# Test empty string
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assert _sanitize_metric_suffix("") == "unknown"
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# Test only special characters
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assert _sanitize_metric_suffix("@#$") == "unknown"
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