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Fix import export graceful shutdown (#476)
* Tech spec for graceful shutdown * Graceful shutdown of importers/exporters * Update socket to include graceful shutdown orchestration * Adding tests for conditions tracked in this PR
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17 changed files with 2668 additions and 193 deletions
382
tests/unit/test_base/test_subscriber_graceful_shutdown.py
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tests/unit/test_base/test_subscriber_graceful_shutdown.py
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"""Unit tests for Subscriber graceful shutdown functionality."""
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import pytest
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import asyncio
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import uuid
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from unittest.mock import AsyncMock, MagicMock, patch
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from trustgraph.base.subscriber import Subscriber
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# Mock JsonSchema globally to avoid schema issues in tests
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# Patch at the module level where it's imported in subscriber
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@patch('trustgraph.base.subscriber.JsonSchema')
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def mock_json_schema_global(mock_schema):
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mock_schema.return_value = MagicMock()
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return mock_schema
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# Apply the global patch
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_json_schema_patch = patch('trustgraph.base.subscriber.JsonSchema')
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_mock_json_schema = _json_schema_patch.start()
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_mock_json_schema.return_value = MagicMock()
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@pytest.fixture
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def mock_pulsar_client():
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"""Mock Pulsar client for testing."""
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client = MagicMock()
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consumer = MagicMock()
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consumer.receive = MagicMock()
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consumer.acknowledge = MagicMock()
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consumer.negative_acknowledge = MagicMock()
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consumer.pause_message_listener = MagicMock()
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consumer.unsubscribe = MagicMock()
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consumer.close = MagicMock()
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client.subscribe.return_value = consumer
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return client
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@pytest.fixture
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def subscriber(mock_pulsar_client):
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"""Create Subscriber instance for testing."""
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return Subscriber(
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client=mock_pulsar_client,
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topic="test-topic",
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subscription="test-subscription",
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consumer_name="test-consumer",
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schema=dict,
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max_size=10,
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drain_timeout=2.0,
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backpressure_strategy="block"
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)
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def create_mock_message(message_id="test-id", data=None):
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"""Create a mock Pulsar message."""
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msg = MagicMock()
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msg.properties.return_value = {"id": message_id}
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msg.value.return_value = data or {"test": "data"}
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return msg
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@pytest.mark.asyncio
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async def test_subscriber_deferred_acknowledgment_success():
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"""Verify Subscriber only acks on successful delivery."""
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mock_client = MagicMock()
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mock_consumer = MagicMock()
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mock_client.subscribe.return_value = mock_consumer
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subscriber = Subscriber(
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client=mock_client,
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topic="test-topic",
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subscription="test-subscription",
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consumer_name="test-consumer",
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schema=dict,
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max_size=10,
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backpressure_strategy="block"
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)
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# Start subscriber to initialize consumer
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await subscriber.start()
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# Create queue for subscription
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queue = await subscriber.subscribe("test-queue")
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# Create mock message with matching queue name
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msg = create_mock_message("test-queue", {"data": "test"})
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# Process message
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await subscriber._process_message(msg)
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# Should acknowledge successful delivery
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mock_consumer.acknowledge.assert_called_once_with(msg)
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mock_consumer.negative_acknowledge.assert_not_called()
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# Message should be in queue
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assert not queue.empty()
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received_msg = await queue.get()
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assert received_msg == {"data": "test"}
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# Clean up
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await subscriber.stop()
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@pytest.mark.asyncio
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async def test_subscriber_deferred_acknowledgment_failure():
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"""Verify Subscriber negative acks on delivery failure."""
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mock_client = MagicMock()
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mock_consumer = MagicMock()
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mock_client.subscribe.return_value = mock_consumer
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subscriber = Subscriber(
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client=mock_client,
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topic="test-topic",
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subscription="test-subscription",
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consumer_name="test-consumer",
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schema=dict,
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max_size=1, # Very small queue
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backpressure_strategy="drop_new"
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)
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# Start subscriber to initialize consumer
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await subscriber.start()
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# Create queue and fill it
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queue = await subscriber.subscribe("test-queue")
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await queue.put({"existing": "data"})
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# Create mock message - should be dropped
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msg = create_mock_message("msg-1", {"data": "test"})
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# Process message (should fail due to full queue + drop_new strategy)
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await subscriber._process_message(msg)
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# Should negative acknowledge failed delivery
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mock_consumer.negative_acknowledge.assert_called_once_with(msg)
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mock_consumer.acknowledge.assert_not_called()
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# Clean up
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await subscriber.stop()
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@pytest.mark.asyncio
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async def test_subscriber_backpressure_strategies():
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"""Test different backpressure strategies."""
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mock_client = MagicMock()
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mock_consumer = MagicMock()
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mock_client.subscribe.return_value = mock_consumer
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# Test drop_oldest strategy
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subscriber = Subscriber(
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client=mock_client,
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topic="test-topic",
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subscription="test-subscription",
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consumer_name="test-consumer",
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schema=dict,
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max_size=2,
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backpressure_strategy="drop_oldest"
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)
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# Start subscriber to initialize consumer
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await subscriber.start()
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queue = await subscriber.subscribe("test-queue")
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# Fill queue
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await queue.put({"data": "old1"})
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await queue.put({"data": "old2"})
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# Add new message (should drop oldest) - use matching queue name
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msg = create_mock_message("test-queue", {"data": "new"})
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await subscriber._process_message(msg)
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# Should acknowledge delivery
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mock_consumer.acknowledge.assert_called_once_with(msg)
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# Queue should have new message (old one dropped)
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messages = []
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while not queue.empty():
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messages.append(await queue.get())
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# Should contain old2 and new (old1 was dropped)
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assert len(messages) == 2
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assert {"data": "new"} in messages
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# Clean up
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await subscriber.stop()
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@pytest.mark.asyncio
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async def test_subscriber_graceful_shutdown():
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"""Test Subscriber graceful shutdown with queue draining."""
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mock_client = MagicMock()
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mock_consumer = MagicMock()
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mock_client.subscribe.return_value = mock_consumer
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subscriber = Subscriber(
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client=mock_client,
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topic="test-topic",
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subscription="test-subscription",
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consumer_name="test-consumer",
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schema=dict,
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max_size=10,
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drain_timeout=1.0
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)
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# Create subscription with messages before starting
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queue = await subscriber.subscribe("test-queue")
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await queue.put({"data": "msg1"})
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await queue.put({"data": "msg2"})
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with patch.object(subscriber, 'run') as mock_run:
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# Mock run that simulates graceful shutdown
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async def mock_run_graceful():
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# Process messages while running, then drain
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while subscriber.running or subscriber.draining:
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if subscriber.draining:
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# Simulate pause message listener
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mock_consumer.pause_message_listener()
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# Drain messages
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while not queue.empty():
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await queue.get()
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break
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await asyncio.sleep(0.05)
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# Cleanup
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mock_consumer.unsubscribe()
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mock_consumer.close()
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mock_run.side_effect = mock_run_graceful
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await subscriber.start()
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# Initial state
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assert subscriber.running is True
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assert subscriber.draining is False
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# Start shutdown
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stop_task = asyncio.create_task(subscriber.stop())
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# Allow brief processing
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await asyncio.sleep(0.1)
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# Should be in drain state
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assert subscriber.running is False
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assert subscriber.draining is True
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# Complete shutdown
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await stop_task
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# Should have cleaned up
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mock_consumer.unsubscribe.assert_called_once()
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mock_consumer.close.assert_called_once()
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@pytest.mark.asyncio
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async def test_subscriber_drain_timeout():
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"""Test Subscriber respects drain timeout."""
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mock_client = MagicMock()
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mock_consumer = MagicMock()
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mock_client.subscribe.return_value = mock_consumer
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subscriber = Subscriber(
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client=mock_client,
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topic="test-topic",
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subscription="test-subscription",
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consumer_name="test-consumer",
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schema=dict,
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max_size=10,
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drain_timeout=0.1 # Very short timeout
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)
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# Create subscription with many messages
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queue = await subscriber.subscribe("test-queue")
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# Fill queue to max capacity (subscriber max_size=10, but queue itself has maxsize=10)
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for i in range(5): # Fill partway to avoid blocking
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await queue.put({"data": f"msg{i}"})
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# Test the timeout behavior without actually running start/stop
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# Just verify the timeout value is set correctly and queue has messages
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assert subscriber.drain_timeout == 0.1
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assert not queue.empty()
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assert queue.qsize() == 5
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# Simulate what would happen during timeout - queue should still have messages
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# This tests the concept without the complex async interaction
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messages_remaining = queue.qsize()
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assert messages_remaining > 0 # Should have messages that would timeout
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@pytest.mark.asyncio
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async def test_subscriber_pending_acks_cleanup():
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"""Test Subscriber cleans up pending acknowledgments on shutdown."""
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mock_client = MagicMock()
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mock_consumer = MagicMock()
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mock_client.subscribe.return_value = mock_consumer
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subscriber = Subscriber(
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client=mock_client,
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topic="test-topic",
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subscription="test-subscription",
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consumer_name="test-consumer",
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schema=dict,
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max_size=10
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)
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# Add pending acknowledgments manually (simulating in-flight messages)
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msg1 = create_mock_message("msg-1")
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msg2 = create_mock_message("msg-2")
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subscriber.pending_acks["ack-1"] = msg1
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subscriber.pending_acks["ack-2"] = msg2
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with patch.object(subscriber, 'run') as mock_run:
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# Mock run that simulates cleanup of pending acks
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async def mock_run_cleanup():
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while subscriber.running or subscriber.draining:
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await asyncio.sleep(0.05)
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if subscriber.draining:
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break
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# Simulate cleanup in finally block
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for msg in subscriber.pending_acks.values():
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mock_consumer.negative_acknowledge(msg)
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subscriber.pending_acks.clear()
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mock_consumer.unsubscribe()
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mock_consumer.close()
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mock_run.side_effect = mock_run_cleanup
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await subscriber.start()
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# Stop subscriber
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await subscriber.stop()
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# Should negative acknowledge pending messages
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assert mock_consumer.negative_acknowledge.call_count == 2
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mock_consumer.negative_acknowledge.assert_any_call(msg1)
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mock_consumer.negative_acknowledge.assert_any_call(msg2)
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# Pending acks should be cleared
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assert len(subscriber.pending_acks) == 0
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@pytest.mark.asyncio
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async def test_subscriber_multiple_subscribers():
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"""Test Subscriber with multiple concurrent subscribers."""
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mock_client = MagicMock()
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mock_consumer = MagicMock()
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mock_client.subscribe.return_value = mock_consumer
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subscriber = Subscriber(
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client=mock_client,
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topic="test-topic",
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subscription="test-subscription",
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consumer_name="test-consumer",
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schema=dict,
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max_size=10
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)
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# Manually set consumer to test without complex async interactions
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subscriber.consumer = mock_consumer
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# Create multiple subscriptions
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queue1 = await subscriber.subscribe("queue-1")
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queue2 = await subscriber.subscribe("queue-2")
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queue_all = await subscriber.subscribe_all("queue-all")
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# Process message - use queue-1 as the target
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msg = create_mock_message("queue-1", {"data": "broadcast"})
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await subscriber._process_message(msg)
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# Should acknowledge (successful delivery to all queues)
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mock_consumer.acknowledge.assert_called_once_with(msg)
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# Message should be in specific queue (queue-1) and broadcast queue
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assert not queue1.empty()
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assert queue2.empty() # No message for queue-2
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assert not queue_all.empty()
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# Verify message content
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msg1 = await queue1.get()
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msg_all = await queue_all.get()
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assert msg1 == {"data": "broadcast"}
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assert msg_all == {"data": "broadcast"}
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