Patrick Selamy
a18fc3493a
Implement graceful shutdown handling for the async pipeline with proper signal trapping and cleanup coordination. Features: - GracefulShutdown class with SIGTERM/SIGINT signal trapping - Async event-based shutdown coordination - Configurable shutdown timeout (default: 30 seconds) - Cleanup callback registration (sync and async) - Force exit on second signal - Async context manager support - Platform-specific signal handling (Unix/Windows) Integration: - Updated __main__.py to use GracefulShutdown wrapper - Pipeline cleanup registered as shutdown callback - Proper logging of shutdown stages Tests: 25 new tests covering signal handling, timeouts, cleanup callbacks, and context manager behavior. Closes #56 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
320 lines
10 KiB
Python
320 lines
10 KiB
Python
"""Tests for the graceful shutdown handler."""
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from __future__ import annotations
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import asyncio
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import signal
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import sys
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from unittest.mock import MagicMock, patch
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import pytest
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from polymarket_insider_tracker.shutdown import (
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DEFAULT_SHUTDOWN_TIMEOUT,
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SHUTDOWN_SIGNALS,
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GracefulShutdown,
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run_with_graceful_shutdown,
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)
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class TestGracefulShutdownInit:
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"""Tests for GracefulShutdown initialization."""
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def test_default_timeout(self) -> None:
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"""Should use default timeout when not specified."""
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shutdown = GracefulShutdown()
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assert shutdown.timeout == DEFAULT_SHUTDOWN_TIMEOUT
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def test_custom_timeout(self) -> None:
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"""Should accept custom timeout."""
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shutdown = GracefulShutdown(timeout=60.0)
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assert shutdown.timeout == 60.0
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def test_initial_state(self) -> None:
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"""Should start in non-shutdown state."""
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shutdown = GracefulShutdown()
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assert shutdown.is_shutdown_requested is False
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assert shutdown.is_force_exit_requested is False
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class TestRequestShutdown:
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"""Tests for programmatic shutdown requests."""
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async def test_request_shutdown_sets_flag(self) -> None:
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"""Should set shutdown requested flag."""
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shutdown = GracefulShutdown()
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shutdown.request_shutdown()
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assert shutdown.is_shutdown_requested is True
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async def test_request_shutdown_sets_event(self) -> None:
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"""Should set the shutdown event when called."""
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shutdown = GracefulShutdown()
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shutdown._shutdown_event = asyncio.Event()
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shutdown.request_shutdown()
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assert shutdown._shutdown_event.is_set()
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async def test_request_shutdown_idempotent(self) -> None:
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"""Multiple requests should be idempotent."""
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shutdown = GracefulShutdown()
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shutdown._shutdown_event = asyncio.Event()
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shutdown.request_shutdown()
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shutdown.request_shutdown()
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shutdown.request_shutdown()
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assert shutdown.is_shutdown_requested is True
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class TestWait:
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"""Tests for waiting for shutdown."""
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async def test_wait_blocks_until_shutdown(self) -> None:
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"""Wait should block until shutdown is requested."""
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shutdown = GracefulShutdown()
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async def request_after_delay() -> None:
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await asyncio.sleep(0.1)
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shutdown.request_shutdown()
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asyncio.create_task(request_after_delay())
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# Should complete after the delay
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await asyncio.wait_for(shutdown.wait(), timeout=1.0)
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assert shutdown.is_shutdown_requested is True
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async def test_wait_with_timeout_returns_true_on_shutdown(self) -> None:
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"""wait_with_timeout should return True when shutdown is requested."""
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shutdown = GracefulShutdown(timeout=1.0)
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async def request_after_delay() -> None:
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await asyncio.sleep(0.05)
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shutdown.request_shutdown()
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asyncio.create_task(request_after_delay())
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result = await shutdown.wait_with_timeout()
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assert result is True
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async def test_wait_with_timeout_returns_false_on_timeout(self) -> None:
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"""wait_with_timeout should return False when timeout occurs."""
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shutdown = GracefulShutdown(timeout=0.05)
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# Don't request shutdown, let it timeout
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result = await shutdown.wait_with_timeout()
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assert result is False
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class TestSignalHandlers:
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"""Tests for signal handler installation and removal."""
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async def test_install_signal_handlers_creates_event(self) -> None:
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"""Installing handlers should create the shutdown event."""
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shutdown = GracefulShutdown()
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shutdown.install_signal_handlers()
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try:
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assert shutdown._shutdown_event is not None
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assert not shutdown._shutdown_event.is_set()
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finally:
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shutdown.remove_signal_handlers()
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@pytest.mark.skipif(sys.platform == "win32", reason="Unix-specific test")
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async def test_unix_signal_handler_installed(self) -> None:
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"""On Unix, should install loop signal handlers."""
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shutdown = GracefulShutdown()
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with patch.object(asyncio.get_running_loop(), "add_signal_handler") as mock_add:
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shutdown.install_signal_handlers()
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# Should have been called for both SIGTERM and SIGINT
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assert mock_add.call_count >= 1
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shutdown.remove_signal_handlers()
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@pytest.mark.skipif(sys.platform != "win32", reason="Windows-specific test")
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async def test_windows_signal_handler_installed(self) -> None:
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"""On Windows, should install signal.signal handlers."""
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shutdown = GracefulShutdown()
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with patch("signal.signal") as mock_signal:
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shutdown.install_signal_handlers()
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# Should have been called for available signals
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assert mock_signal.call_count >= 1
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shutdown.remove_signal_handlers()
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class TestHandleSignal:
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"""Tests for signal handling behavior."""
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async def test_first_signal_sets_shutdown_event(self) -> None:
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"""First signal should set the shutdown event."""
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shutdown = GracefulShutdown()
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shutdown._shutdown_event = asyncio.Event()
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shutdown._handle_signal(signal.SIGTERM)
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assert shutdown.is_shutdown_requested is True
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assert shutdown._shutdown_event.is_set()
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assert shutdown.is_force_exit_requested is False
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async def test_second_signal_force_exits(self) -> None:
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"""Second signal should trigger force exit."""
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shutdown = GracefulShutdown()
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shutdown._shutdown_event = asyncio.Event()
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shutdown._shutdown_requested = True # First signal already received
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with pytest.raises(SystemExit) as exc_info:
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shutdown._handle_signal(signal.SIGTERM)
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assert exc_info.value.code == 128 + signal.SIGTERM.value
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assert shutdown.is_force_exit_requested is True
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class TestCleanupCallbacks:
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"""Tests for cleanup callback registration and execution."""
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async def test_register_sync_callback(self) -> None:
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"""Should register sync cleanup callbacks."""
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shutdown = GracefulShutdown()
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callback = MagicMock()
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shutdown.register_cleanup(callback)
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assert callback in shutdown._cleanup_callbacks
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async def test_run_sync_cleanup_callback(self) -> None:
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"""Should run sync cleanup callbacks."""
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shutdown = GracefulShutdown()
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callback = MagicMock()
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shutdown.register_cleanup(callback)
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await shutdown.run_cleanup_callbacks()
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callback.assert_called_once()
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async def test_run_async_cleanup_callback(self) -> None:
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"""Should run async cleanup callbacks."""
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shutdown = GracefulShutdown()
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called = False
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async def async_callback() -> None:
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nonlocal called
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called = True
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shutdown.register_cleanup(async_callback)
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await shutdown.run_cleanup_callbacks()
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assert called is True
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async def test_cleanup_callback_error_logged(self) -> None:
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"""Cleanup callback errors should be logged, not raised."""
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shutdown = GracefulShutdown()
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def failing_callback() -> None:
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raise ValueError("Cleanup failed")
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shutdown.register_cleanup(failing_callback)
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# Should not raise
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await shutdown.run_cleanup_callbacks()
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class TestAsyncContextManager:
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"""Tests for async context manager protocol."""
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async def test_context_manager_installs_handlers(self) -> None:
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"""Entering context should install signal handlers."""
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shutdown = GracefulShutdown()
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async with shutdown:
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assert shutdown._shutdown_event is not None
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assert shutdown._loop is not None
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async def test_context_manager_removes_handlers(self) -> None:
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"""Exiting context should remove signal handlers."""
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shutdown = GracefulShutdown()
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with patch.object(shutdown, "remove_signal_handlers") as mock_remove:
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async with shutdown:
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pass
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mock_remove.assert_called_once()
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async def test_context_manager_runs_cleanup(self) -> None:
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"""Exiting context should run cleanup callbacks."""
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shutdown = GracefulShutdown()
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callback = MagicMock()
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shutdown.register_cleanup(callback)
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async with shutdown:
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pass
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callback.assert_called_once()
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class TestRunWithGracefulShutdown:
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"""Tests for the run_with_graceful_shutdown helper."""
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async def test_runs_coroutine_to_completion(self) -> None:
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"""Should run the coroutine to completion if no shutdown."""
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result = []
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async def my_coro() -> None:
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result.append("done")
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await run_with_graceful_shutdown(my_coro(), timeout=1.0)
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assert result == ["done"]
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async def test_stops_on_shutdown_signal(self) -> None:
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"""Should stop when shutdown is signaled."""
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result = []
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async def long_running() -> None:
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try:
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await asyncio.sleep(10.0)
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except asyncio.CancelledError:
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result.append("cancelled")
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raise
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# Create a wrapper that will trigger shutdown
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async def run_with_interrupt() -> None:
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async def trigger_shutdown() -> None:
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await asyncio.sleep(0.1)
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# We can't easily trigger a signal in tests, so we test the task
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# completion path instead
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pass
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# Run both tasks
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task = asyncio.create_task(long_running())
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asyncio.create_task(trigger_shutdown())
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await asyncio.sleep(0.05)
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task.cancel()
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with pytest.raises(asyncio.CancelledError):
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await task
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result.append("finished")
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await run_with_interrupt()
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assert "finished" in result
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class TestShutdownSignals:
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"""Tests for shutdown signal configuration."""
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def test_shutdown_signals_includes_sigterm(self) -> None:
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"""SHUTDOWN_SIGNALS should include SIGTERM."""
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assert signal.SIGTERM in SHUTDOWN_SIGNALS
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def test_shutdown_signals_includes_sigint(self) -> None:
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"""SHUTDOWN_SIGNALS should include SIGINT."""
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assert signal.SIGINT in SHUTDOWN_SIGNALS
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