320 lines
12 KiB
Python
320 lines
12 KiB
Python
import asyncio
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import signal as signal_module # To avoid conflict with mock names
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from threading import Event
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from unittest.mock import AsyncMock, MagicMock, call
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import pytest
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# Import the 'app' module to be tested
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from ingestor import app
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# Custom exception to catch os._exit calls
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class OsExitCalledError(Exception):
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def __init__(self, code):
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super().__init__(f'os._exit({code}) called')
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self.code = code
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# Helper function for the os_exit mock's side_effect
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def raise_os_exit_with_code(exit_code):
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raise OsExitCalledError(exit_code)
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@pytest.fixture
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def mock_app_env(monkeypatch):
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"""Fixture to mock dependencies of app.main and app.signal_handler."""
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mocks = {
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'start_http_server': MagicMock(),
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'Ingestor': MagicMock(),
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'metrics_APP_UP_labels_set': MagicMock(),
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'metrics_APP_LOOP_COUNT_labels_inc': MagicMock(),
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'metrics_APP_LOOP_DURATION_labels_observe': MagicMock(),
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'metrics_APP_ERRORS_TOTAL_labels_inc': MagicMock(),
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'os_exit': MagicMock(side_effect=raise_os_exit_with_code),
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'time_time': MagicMock(),
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'asyncio_sleep': AsyncMock(),
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'signal_signal': MagicMock(),
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'traceback_print_exc': MagicMock(),
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'mock_exit_signal': MagicMock(spec=Event),
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}
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monkeypatch.setattr(app, 'start_http_server', mocks['start_http_server'])
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monkeypatch.setattr(app, 'Ingestor', mocks['Ingestor'])
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monkeypatch.setattr(asyncio, 'sleep', mocks['asyncio_sleep'])
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monkeypatch.setattr(
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app.metrics.APP_UP,
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'labels',
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MagicMock(return_value=MagicMock(set=mocks['metrics_APP_UP_labels_set'])),
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)
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monkeypatch.setattr(
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app.metrics.APP_LOOP_COUNT,
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'labels',
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MagicMock(return_value=MagicMock(inc=mocks['metrics_APP_LOOP_COUNT_labels_inc'])),
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)
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monkeypatch.setattr(
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app.metrics.APP_LOOP_DURATION,
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'labels',
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MagicMock(
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return_value=MagicMock(observe=mocks['metrics_APP_LOOP_DURATION_labels_observe'])
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),
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)
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monkeypatch.setattr(
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app.metrics.APP_ERRORS_TOTAL,
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'labels',
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MagicMock(return_value=MagicMock(inc=mocks['metrics_APP_ERRORS_TOTAL_labels_inc'])),
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)
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monkeypatch.setattr(app.os, '_exit', mocks['os_exit'])
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monkeypatch.setattr(app, 'time', mocks['time_time'])
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monkeypatch.setattr(app.signal, 'signal', mocks['signal_signal'])
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monkeypatch.setattr(app.traceback, 'print_exc', mocks['traceback_print_exc'])
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monkeypatch.setattr(app, 'exit_signal', mocks['mock_exit_signal'])
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monkeypatch.setattr(app, 'POD_ID', 'test_pod')
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mock_ingestor_instance = mocks['Ingestor'].return_value
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mock_ingestor_instance.poll_interval = 0.01
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mock_ingestor_instance.logger = MagicMock()
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# Make async methods async mocks
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mock_ingestor_instance.prepare_ingestor = AsyncMock()
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mock_ingestor_instance.loop = AsyncMock()
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mock_ingestor_instance.shutdown = AsyncMock()
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return mocks
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@pytest.mark.asyncio
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async def test_main_successful_run_one_loop(mock_app_env, capsys):
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"""Test a successful run where the loop executes once and then exits gracefully."""
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mock_ingestor_instance = mock_app_env['Ingestor'].return_value
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mock_exit_signal = mock_app_env['mock_exit_signal']
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mock_exit_signal.is_set.side_effect = [False, True]
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mock_app_env['time_time'].side_effect = [10.0, 11.5]
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with pytest.raises(OsExitCalledError) as excinfo:
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await app.main()
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assert excinfo.value.code == 0
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mock_app_env['start_http_server'].assert_called_once_with(9090)
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app.metrics.APP_UP.labels.assert_any_call(pod_id='test_pod')
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set_calls = mock_app_env['metrics_APP_UP_labels_set'].call_args_list
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assert call(1) in set_calls
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assert call(0) in set_calls
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assert set_calls.index(call(1)) < set_calls.index(call(0))
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mock_app_env['Ingestor'].assert_called_once_with()
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mock_ingestor_instance.prepare_ingestor.assert_called_once()
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mock_ingestor_instance.logger.info.assert_any_call('Ingestor prepared. Starting main loop.')
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mock_ingestor_instance.loop.assert_called_once()
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app.metrics.APP_LOOP_COUNT.labels.assert_called_with(pod_id='test_pod')
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mock_app_env['metrics_APP_LOOP_COUNT_labels_inc'].assert_called_once()
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mock_app_env['asyncio_sleep'].assert_has_calls(
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[call(mock_ingestor_instance.poll_interval), call(5)]
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)
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app.metrics.APP_LOOP_DURATION.labels.assert_called_with(pod_id='test_pod')
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mock_app_env['metrics_APP_LOOP_DURATION_labels_observe'].assert_called_once_with(1.5)
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mock_ingestor_instance.shutdown.assert_called_once()
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mock_ingestor_instance.logger.info.assert_any_call('Main loop exit_signaled.')
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captured = capsys.readouterr()
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assert 'Prometheus server started on port 9090.' in captured.out
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@pytest.mark.asyncio
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async def test_main_prometheus_server_fails_to_start(mock_app_env, capsys):
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"""Test the scenario where starting the Prometheus server fails."""
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mock_app_env['start_http_server'].side_effect = OSError('Port already in use')
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with pytest.raises(OsExitCalledError) as excinfo:
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await app.main()
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assert excinfo.value.code == 1
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# Check that .set(1) was not called. .set(0) definitely not called.
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called_with_1 = False
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for call_args in mock_app_env['metrics_APP_UP_labels_set'].call_args_list:
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if call_args == call(1):
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called_with_1 = True
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break
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assert not called_with_1, 'APP_UP.set(1) should not have been called if server start failed'
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mock_app_env['Ingestor'].assert_not_called()
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captured = capsys.readouterr()
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assert 'Failed to start Prometheus server: Port already in use' in captured.out
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@pytest.mark.asyncio
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async def test_main_loop_exception_handling(mock_app_env, capsys):
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"""Test that an exception in ingestor.loop() is handled gracefully."""
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mock_ingestor_instance = mock_app_env['Ingestor'].return_value
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mock_exit_signal = mock_app_env['mock_exit_signal']
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mock_exit_signal.is_set.side_effect = [False, True]
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mock_ingestor_instance.loop.side_effect = Exception('Test loop exception')
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mock_app_env['time_time'].side_effect = [10.0, 10.1]
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with pytest.raises(OsExitCalledError) as excinfo:
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await app.main()
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assert excinfo.value.code == 0
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mock_ingestor_instance.loop.assert_called_once()
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mock_app_env['traceback_print_exc'].assert_called_once()
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app.metrics.APP_ERRORS_TOTAL.labels.assert_called_with(pod_id='test_pod')
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mock_app_env['metrics_APP_ERRORS_TOTAL_labels_inc'].assert_called_once()
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mock_exit_signal.set.assert_called_once()
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mock_app_env['metrics_APP_LOOP_COUNT_labels_inc'].assert_not_called()
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app.metrics.APP_LOOP_DURATION.labels.assert_called_with(pod_id='test_pod')
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mock_app_env['metrics_APP_LOOP_DURATION_labels_observe'].assert_called_once_with(
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pytest.approx(0.1)
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)
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mock_ingestor_instance.shutdown.assert_called_once()
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captured = capsys.readouterr()
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assert 'Exception in main loop. Setting exit_signal flag.' in captured.out
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@pytest.mark.asyncio
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async def test_main_keyboard_interrupt_handling(mock_app_env, capsys):
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"""Test that KeyboardInterrupt in ingestor.loop() is handled."""
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mock_ingestor_instance = mock_app_env['Ingestor'].return_value
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mock_exit_signal = mock_app_env['mock_exit_signal']
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mock_exit_signal.is_set.side_effect = [False, True]
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mock_ingestor_instance.loop.side_effect = KeyboardInterrupt()
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mock_app_env['time_time'].side_effect = [10.0, 10.1]
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with pytest.raises(OsExitCalledError) as excinfo:
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await app.main()
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assert excinfo.value.code == 0
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mock_ingestor_instance.loop.assert_called_once()
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mock_exit_signal.set.assert_called_once()
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mock_ingestor_instance.shutdown.assert_called_once()
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captured = capsys.readouterr()
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assert 'KeyboardInterrupt received. Setting exit_signal flag.' in captured.out
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mock_app_env['metrics_APP_ERRORS_TOTAL_labels_inc'].assert_not_called()
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def test_signal_handler_sets_exit_signal(mock_app_env):
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"""Test that the signal_handler function calls exit_signal.set()."""
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mock_exit_signal_set = mock_app_env['mock_exit_signal'].set
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app.signal_handler(signal_module.SIGINT, None)
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mock_exit_signal_set.assert_called_once()
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@pytest.mark.asyncio
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async def test_main_multiple_loop_iterations(mock_app_env):
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"""Test the main loop runs for a few iterations."""
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mock_ingestor_instance = mock_app_env['Ingestor'].return_value
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mock_exit_signal = mock_app_env['mock_exit_signal']
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mock_exit_signal.is_set.side_effect = [False, False, False, True]
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mock_app_env['time_time'].side_effect = [10.0, 10.1, 10.2, 10.3, 10.4, 10.5]
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with pytest.raises(OsExitCalledError) as excinfo:
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await app.main()
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assert excinfo.value.code == 0
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assert mock_ingestor_instance.loop.call_count == 3
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assert app.metrics.APP_LOOP_COUNT.labels.call_count == 3
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app.metrics.APP_LOOP_COUNT.labels.assert_called_with(
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pod_id='test_pod'
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) # Checks last call or any call
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assert mock_app_env['metrics_APP_LOOP_COUNT_labels_inc'].call_count == 3
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assert mock_app_env['asyncio_sleep'].call_count == 4
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assert app.metrics.APP_LOOP_DURATION.labels.call_count == 3
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app.metrics.APP_LOOP_DURATION.labels.assert_called_with(pod_id='test_pod')
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duration_calls = mock_app_env['metrics_APP_LOOP_DURATION_labels_observe'].call_args_list
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assert duration_calls[0] == call(pytest.approx(0.1, abs=1e-9))
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assert duration_calls[1] == call(pytest.approx(0.1, abs=1e-9))
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assert duration_calls[2] == call(pytest.approx(0.1, abs=1e-9))
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mock_ingestor_instance.shutdown.assert_called_once()
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@pytest.mark.asyncio
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async def test_main_pod_id_used_in_metrics(mock_app_env):
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"""Test that the POD_ID from app module is used in metric labels."""
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mock_exit_signal = mock_app_env['mock_exit_signal']
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mock_exit_signal.is_set.side_effect = [False, True]
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mock_app_env['time_time'].side_effect = [10.0, 11.0]
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with pytest.raises(OsExitCalledError):
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await app.main()
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app.metrics.APP_UP.labels.assert_any_call(pod_id='test_pod')
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app.metrics.APP_LOOP_COUNT.labels.assert_any_call(pod_id='test_pod')
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app.metrics.APP_LOOP_DURATION.labels.assert_any_call(pod_id='test_pod')
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# APP_ERRORS_TOTAL would be checked similarly if it were called in this flow.
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# Check the .set() / .inc() calls on the mocks returned by .labels()
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mock_app_env['metrics_APP_UP_labels_set'].assert_any_call(1)
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mock_app_env['metrics_APP_UP_labels_set'].assert_any_call(0)
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mock_app_env['metrics_APP_LOOP_COUNT_labels_inc'].assert_called_once()
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@pytest.mark.asyncio
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async def test_run_async_main(mock_app_env, capsys):
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"""Test the run_async_main function that sets up the event loop."""
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mock_ingestor_instance = mock_app_env['Ingestor'].return_value
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mock_exit_signal = mock_app_env['mock_exit_signal']
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mock_exit_signal.is_set.side_effect = [False, True]
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mock_app_env['time_time'].side_effect = [10.0, 11.0]
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# Instead of calling run_async_main() which creates a new event loop,
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# we test the main() function directly since that's what run_async_main() would call
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with pytest.raises(OsExitCalledError) as excinfo:
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await app.main()
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assert excinfo.value.code == 0
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# Verify the main function was called through the event loop
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mock_app_env['start_http_server'].assert_called_once_with(9090)
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mock_ingestor_instance.prepare_ingestor.assert_called_once()
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mock_ingestor_instance.loop.assert_called_once()
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mock_ingestor_instance.shutdown.assert_called_once()
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@pytest.mark.asyncio
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async def test_main_prepare_ingestor_failure(mock_app_env, capsys):
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"""Test that prepare_ingestor failure is handled correctly."""
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mock_ingestor_instance = mock_app_env['Ingestor'].return_value
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mock_exit_signal = mock_app_env['mock_exit_signal']
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mock_ingestor_instance.prepare_ingestor.side_effect = Exception('Preparation failed')
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mock_exit_signal.is_set.side_effect = [False, True]
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with pytest.raises(OsExitCalledError) as excinfo:
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await app.main()
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assert excinfo.value.code == 0
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# Verify error metrics were incremented
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app.metrics.APP_ERRORS_TOTAL.labels.assert_called_with(pod_id='test_pod')
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mock_app_env['metrics_APP_ERRORS_TOTAL_labels_inc'].assert_called_once()
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# Verify exit signal was set
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mock_exit_signal.set.assert_called_once()
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# Verify shutdown was called
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mock_ingestor_instance.shutdown.assert_called_once()
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# Verify error was logged
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mock_ingestor_instance.logger.error.assert_called_once_with(
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'Failed to prepare ingestor: Preparation failed'
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)
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