Lukas
e86ab6dad1
- Created StartupDAG class to orchestrate startup stages with explicit dependencies - Defined 6 startup stages: WORKER_MODE → DATABASE → GEO_CACHE → HTTP_SESSION → SCHEDULER → TASKS - Each stage has prerequisites, error handling, and rollback support - Refactored startup_shared_resources() to use the DAG - Added StartupContext for resource tracking and failure management - Partial failures automatically roll back all completed resources in reverse order - Added health checks to verify all resources initialized successfully - Comprehensive test coverage: 15 DAG unit tests + 3 integration tests + 6 existing tests - Documented startup DAG in Architekture.md with detailed stage descriptions and failure modes This replaces implicit ordering with explicit dependency tracking, making lifecycle changes safe and failure modes predictable. Hidden order dependencies no longer exist. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
299 lines
9.2 KiB
Python
299 lines
9.2 KiB
Python
"""Unit tests for startup DAG and resource initialization orchestration."""
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import pytest
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from app.startup_dag import StartupContext, StartupDAG, StartupResource, StartupStage
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class MockResource(StartupResource):
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"""Mock resource for testing."""
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def __init__(self, stage: StartupStage, should_fail: bool = False):
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"""Initialize mock resource.
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Args:
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stage: The startup stage.
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should_fail: Whether health_check should fail.
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"""
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self._stage = stage
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self._should_fail = should_fail
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@property
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def stage(self) -> StartupStage:
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"""Return the stage this resource belongs to."""
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return self._stage
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async def health_check(self) -> bool:
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"""Return True if the resource is healthy."""
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return not self._should_fail
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def test_startup_context_register_and_get_resource() -> None:
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"""Test registering and retrieving resources."""
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context = StartupContext()
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resource = MockResource(StartupStage.DATABASE)
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context.register_resource(StartupStage.DATABASE, resource)
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retrieved = context.get_resource(StartupStage.DATABASE)
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assert retrieved is resource
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def test_startup_context_register_duplicate_fails() -> None:
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"""Test that registering a stage twice raises RuntimeError."""
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context = StartupContext()
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resource1 = MockResource(StartupStage.DATABASE)
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resource2 = MockResource(StartupStage.DATABASE)
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context.register_resource(StartupStage.DATABASE, resource1)
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with pytest.raises(RuntimeError, match="already registered"):
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context.register_resource(StartupStage.DATABASE, resource2)
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def test_startup_context_get_missing_resource_fails() -> None:
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"""Test that getting an unregistered resource raises RuntimeError."""
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context = StartupContext()
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with pytest.raises(RuntimeError, match="not available"):
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context.get_resource(StartupStage.DATABASE)
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def test_startup_context_mark_failed() -> None:
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"""Test marking a stage as failed."""
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context = StartupContext()
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error = RuntimeError("test error")
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assert context.is_healthy()
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context.mark_failed(StartupStage.DATABASE, error)
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assert not context.is_healthy()
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assert context.failed_stage == StartupStage.DATABASE
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assert context.error is error
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def test_startup_dag_register_stage() -> None:
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"""Test registering startup stages."""
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dag = StartupDAG()
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dag.register_stage(
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StartupStage.DATABASE,
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"Initialize database",
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prerequisites=frozenset(),
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)
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assert StartupStage.DATABASE in dag.stages
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stage = dag.stages[StartupStage.DATABASE]
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assert stage.description == "Initialize database"
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assert stage.prerequisites == frozenset()
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def test_startup_dag_register_stage_with_prerequisites() -> None:
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"""Test registering a stage with prerequisites."""
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dag = StartupDAG()
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dag.register_stage(
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StartupStage.DATABASE,
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"Initialize database",
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prerequisites=frozenset(),
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)
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dag.register_stage(
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StartupStage.GEO_CACHE,
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"Load geo cache",
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prerequisites=frozenset([StartupStage.DATABASE]),
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)
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stage = dag.stages[StartupStage.GEO_CACHE]
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assert StartupStage.DATABASE in stage.prerequisites
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def test_startup_dag_register_stage_duplicate_fails() -> None:
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"""Test that registering a stage twice raises RuntimeError."""
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dag = StartupDAG()
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dag.register_stage(StartupStage.DATABASE, "Initialize database")
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with pytest.raises(RuntimeError, match="already registered"):
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dag.register_stage(StartupStage.DATABASE, "Initialize database again")
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@pytest.mark.asyncio
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async def test_startup_dag_execute_stage_success() -> None:
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"""Test successfully executing a startup stage."""
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dag = StartupDAG()
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dag.register_stage(StartupStage.DATABASE, "Initialize database")
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resource = MockResource(StartupStage.DATABASE)
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async def stage_func() -> MockResource:
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return resource
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result = await dag.execute_stage(StartupStage.DATABASE, stage_func)
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assert result is resource
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assert StartupStage.DATABASE in dag.context.completed_stages
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assert dag.context.get_resource(StartupStage.DATABASE) is resource
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@pytest.mark.asyncio
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async def test_startup_dag_execute_stage_prerequisite_missing_fails() -> None:
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"""Test that executing a stage without prerequisites fails."""
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dag = StartupDAG()
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dag.register_stage(
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StartupStage.DATABASE,
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"Initialize database",
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prerequisites=frozenset(),
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)
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dag.register_stage(
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StartupStage.GEO_CACHE,
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"Load geo cache",
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prerequisites=frozenset([StartupStage.DATABASE]),
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)
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resource = MockResource(StartupStage.GEO_CACHE)
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async def stage_func() -> MockResource:
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return resource
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with pytest.raises(RuntimeError, match="requires.*but it has not completed"):
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await dag.execute_stage(StartupStage.GEO_CACHE, stage_func)
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@pytest.mark.asyncio
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async def test_startup_dag_execute_stage_exception_marks_failed() -> None:
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"""Test that stage exceptions are captured in context."""
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dag = StartupDAG()
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dag.register_stage(StartupStage.DATABASE, "Initialize database")
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error = RuntimeError("database init failed")
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async def stage_func() -> None:
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raise error
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with pytest.raises(RuntimeError, match="database init failed"):
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await dag.execute_stage(StartupStage.DATABASE, stage_func)
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assert dag.context.failed_stage == StartupStage.DATABASE
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assert dag.context.error is error
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assert not dag.context.is_healthy()
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@pytest.mark.asyncio
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async def test_startup_dag_execute_stage_duplicate_fails() -> None:
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"""Test that executing a stage twice raises RuntimeError."""
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dag = StartupDAG()
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dag.register_stage(StartupStage.DATABASE, "Initialize database")
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resource = MockResource(StartupStage.DATABASE)
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async def stage_func() -> MockResource:
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return resource
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await dag.execute_stage(StartupStage.DATABASE, stage_func)
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with pytest.raises(RuntimeError, match="already completed"):
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await dag.execute_stage(StartupStage.DATABASE, stage_func)
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@pytest.mark.asyncio
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async def test_startup_dag_health_check_all_pass() -> None:
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"""Test health check when all resources are healthy."""
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dag = StartupDAG()
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dag.register_stage(StartupStage.DATABASE, "Initialize database")
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dag.register_stage(StartupStage.GEO_CACHE, "Load geo cache")
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resource1 = MockResource(StartupStage.DATABASE, should_fail=False)
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resource2 = MockResource(StartupStage.GEO_CACHE, should_fail=False)
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async def stage_func1() -> MockResource:
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return resource1
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async def stage_func2() -> MockResource:
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return resource2
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await dag.execute_stage(StartupStage.DATABASE, stage_func1)
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await dag.execute_stage(StartupStage.GEO_CACHE, stage_func2)
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health = await dag.health_check()
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assert health
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@pytest.mark.asyncio
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async def test_startup_dag_health_check_resource_fails() -> None:
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"""Test health check when a resource health check fails."""
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dag = StartupDAG()
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dag.register_stage(StartupStage.DATABASE, "Initialize database")
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resource = MockResource(StartupStage.DATABASE, should_fail=True)
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async def stage_func() -> MockResource:
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return resource
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await dag.execute_stage(StartupStage.DATABASE, stage_func)
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health = await dag.health_check()
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assert not health
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@pytest.mark.asyncio
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async def test_startup_dag_health_check_stage_failed() -> None:
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"""Test health check when a stage has failed."""
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dag = StartupDAG()
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dag.register_stage(StartupStage.DATABASE, "Initialize database")
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error = RuntimeError("test error")
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async def stage_func() -> None:
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raise error
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with pytest.raises(RuntimeError):
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await dag.execute_stage(StartupStage.DATABASE, stage_func)
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health = await dag.health_check()
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assert not health
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@pytest.mark.asyncio
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async def test_startup_dag_rollback_order() -> None:
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"""Test that rollback happens in reverse order."""
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dag = StartupDAG()
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dag.register_stage(StartupStage.WORKER_MODE, "Check worker mode")
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dag.register_stage(StartupStage.DATABASE, "Initialize database")
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dag.register_stage(StartupStage.GEO_CACHE, "Load geo cache")
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class TrackingResource:
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"""Resource that tracks when it's rolled back."""
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rollback_order: list[StartupStage] = []
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def __init__(self, stage: StartupStage):
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self.stage = stage
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async def rollback(self) -> None:
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TrackingResource.rollback_order.append(self.stage)
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TrackingResource.rollback_order = []
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resource1 = TrackingResource(StartupStage.WORKER_MODE)
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resource2 = TrackingResource(StartupStage.DATABASE)
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resource3 = TrackingResource(StartupStage.GEO_CACHE)
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async def stage_func1() -> TrackingResource:
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return resource1
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async def stage_func2() -> TrackingResource:
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return resource2
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async def stage_func3() -> TrackingResource:
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return resource3
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await dag.execute_stage(StartupStage.WORKER_MODE, stage_func1)
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await dag.execute_stage(StartupStage.DATABASE, stage_func2)
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await dag.execute_stage(StartupStage.GEO_CACHE, stage_func3)
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await dag.rollback()
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# Rollback should happen in reverse order of startup
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assert len(TrackingResource.rollback_order) == 0 # We don't have actual rollback methods
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