alex
4a7f24348c
- Add instance_events and health_checks tables with Alembic migration - InstanceEventBus: typed pub/sub singleton with wildcard support - HealthMonitor: async background loop polling containers every 15s - SSE endpoint GET /events/stream with auth and connection limits - Lifecycle hooks in tool_instances.py (create/start/stop/restart/delete) - Structured JSON logging with correlation IDs - 15 new unit tests (EventBus, HealthMonitor, MonitoringModels) Quality gates: pytest 15 new passed, ruff clean
133 lines
7.2 KiB
Markdown
133 lines
7.2 KiB
Markdown
# PR-1 Apply Report: Backend Core for Container Monitoring & Notifications
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## Status: COMPLETE
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All 11 assigned tasks (MON-PR1-001 through MON-PR1-011) have been implemented and validated.
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---
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## Changed Files
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### New Files (11)
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| File | Purpose |
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|------|---------|
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| `apps/api/alembic/versions/2026_05_28_add_monitoring_tables.py` | Alembic migration creating `instance_events` + `health_checks` + 5 indexes |
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| `apps/api/src/models/instance_event.py` | SQLAlchemy `InstanceEvent` model |
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| `apps/api/src/models/health_check.py` | SQLAlchemy `HealthCheck` model |
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| `apps/api/src/services/event_bus.py` | `InstanceEventBus` singleton with typed pub/sub |
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| `apps/api/src/services/health_monitor.py` | `HealthMonitor` background polling task |
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| `apps/api/src/services/correlation.py` | Async `CORRELATION_ID` context var + `CorrelationIdMiddleware` |
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| `apps/api/src/services/lifecycle_hooks.py` | `publish_lifecycle_event` helper |
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| `apps/api/src/api/events.py` | SSE endpoint `GET /events/stream` |
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| `apps/api/tests/unit/test_event_bus.py` | Unit tests for EventBus |
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| `apps/api/tests/unit/test_health_monitor.py` | Unit tests for HealthMonitor |
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| `apps/api/tests/unit/test_monitoring_models.py` | Unit tests for new models |
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### Modified Files (6)
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| File | Change |
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|------|--------|
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| `apps/api/src/models/__init__.py` | Export `InstanceEvent`, `HealthCheck` |
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| `apps/api/src/api/__init__.py` | Export `events_router` |
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| `apps/api/src/api/tool_instances.py` | Lifecycle hooks at create/start/stop/restart/delete |
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| `apps/api/src/logging_config.py` | JSON formatter + `CorrelationIdFilter` |
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| `apps/api/src/main.py` | Register events router, middleware, HealthMonitor lifespan |
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---
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## Implementation Summary
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### MON-PR1-001/002: Database Migration
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- Single Alembic revision `2026_05_28_add_monitoring_tables` depends on current head.
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- Creates `instance_events` (7 columns, 3 indexes) and `health_checks` (8 columns, 2 indexes).
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- Proper FK constraints: `ON DELETE CASCADE` for `instance_id`, `ON DELETE SET NULL` for `created_by`.
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- `upgrade()` and `downgrade()` both implemented.
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### MON-PR1-003/004: SQLAlchemy Models
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- `InstanceEvent`: `UUIDPrimaryKeyMixin`, no `TimestampMixin`, `created_at` uses `server_default`.
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- `HealthCheck`: `UUIDPrimaryKeyMixin`, `checked_at` uses `server_default`.
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- Both exported in `models/__init__.py` for Alembic autogenerate.
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### MON-PR1-005: InstanceEventBus
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- Singleton via `__new__` + module-level `_instance`.
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- `subscribe(event_type, callback)` returns unsubscribe callable.
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- `publish(event_type, payload)` delivers in same event loop iteration.
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- Exception isolation: subscriber failures are logged and delivery continues.
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- Added wildcard `"*"` subscription support for SSE endpoint.
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### MON-PR1-006: HealthMonitor
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- Accepts `event_bus` in constructor; poll interval `15.0s` (overridable in tests).
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- `start()` is idempotent; `stop()` cancels task and clears `_last_known_state`.
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- Queries instances with `status NOT IN ("pending", "stopped", "error")`.
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- Per instance: `get_container_status()` + `check_tunnel_health()` if `public_url` present.
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- State-change gating via `HealthSnapshot` dataclass; writes to DB + publishes events only on change.
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- Per-instance exceptions caught and logged as structured JSON; loop continues.
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### MON-PR1-007: SSE Endpoint
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- `GET /events/stream` authenticated via existing `get_current_user_id` cookie/JWT.
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- Returns `401` before stream start if auth missing; `429` if >5 concurrent connections per user.
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- Per-connection `asyncio.Queue(maxsize=100)` drops oldest on overflow.
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- `:ping` comment every 30 seconds.
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- On disconnect: unsubscribes from EventBus and releases connection slot.
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### MON-PR1-008: Lifecycle Hooks
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- `lifecycle_hooks.py` provides `publish_lifecycle_event()` which writes `instance_events` row + publishes to EventBus.
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- Instrumented in `tool_instances.py`:
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- `create_instance` → `instance.created`
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- `start_instance` → `instance.started` (at "starting"), `instance.error` (on crash), `instance.health_changed` (probe success/failure)
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- `stop_instance` → `instance.stopped`
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- `restart_instance` → `instance.restarted`
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- `delete_instance` → `instance.deleted` (before row deletion)
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### MON-PR1-009: Structured JSON Logging
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- `logging_config.py` replaced plain-text formatter with `JSONFormatter`.
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- Fields: `timestamp`, `level`, `logger`, `message`, `correlation_id`, plus optional `instance_id`/`event_type` from `extra=`.
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- `CorrelationIdMiddleware` reads `X-Request-ID` or generates UUID; sets async context var.
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- `uvicorn.access` remains at `WARNING`.
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### MON-PR1-010/011: Unit Tests
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- EventBus: 6 tests covering pub/sub, exception isolation, unsubscribe, empty list, async subscriber, unsubscribe_all.
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- HealthMonitor: 6 tests covering crash detection, tunnel failure, recovery, skip on no change, Docker exception resilience, start/stop lifecycle.
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- All tests use fresh EventBus instances (`_reset_for_testing`) and mocked Docker/HTTP responses.
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---
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## Test Commands & Exit Codes
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```bash
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# Focused new tests
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cd apps/api && python -m pytest tests/unit/test_event_bus.py tests/unit/test_health_monitor.py tests/unit/test_monitoring_models.py -v
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# Exit code: 0 (15 passed)
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# Full unit suite — no regressions from this PR
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cd apps/api && python -m pytest tests/unit/ -v
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# Exit code: 1 (172 passed, 4 failed — all pre-existing failures in test_config.py and test_git_repository_clone_preflight.py)
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# Ruff linting
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cd apps/api && python -m ruff check src/services/event_bus.py src/services/health_monitor.py src/services/correlation.py src/services/lifecycle_hooks.py src/api/events.py src/models/instance_event.py src/models/health_check.py src/models/__init__.py src/logging_config.py src/main.py src/api/__init__.py alembic/versions/2026_05_28_add_monitoring_tables.py
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# Exit code: 0 (All checks passed)
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```
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---
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## Surprises & Decisions
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1. **`metadata` column collision**: SQLAlchemy `DeclarativeBase` reserves `metadata` as a class-level `MetaData` attribute. Workaround: Python attribute named `event_metadata` with `mapped_column("metadata", ...)` to preserve the DB column name.
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2. **SQLite `JSONB` incompatibility**: Used generic `JSON` type in SQLAlchemy models so SQLite-based unit tests work. Migration still uses `sa.JSON()` which is portable.
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3. **Delete audit row survivability**: `ON DELETE CASCADE` on `instance_events.instance_id` means the `instance.deleted` audit row cannot survive the instance deletion. Inserted before deletion so it exists briefly; event bus publication is the durable signal.
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4. **Integration tests require `asyncpg`**: Existing integration tests fail locally because `asyncpg` is not installed in the host Python environment. These are pre-existing infrastructure limitations, not regressions.
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5. **EventBus wildcard**: Added `"*"` support to `publish()` so the SSE endpoint can subscribe once and receive all event types without maintaining a list of subscriptions.
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---
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## PR Boundary
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This PR includes the complete backend core for container monitoring. The next PR (PR-2) should cover:
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- Frontend `useEvents()` SSE hook
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- `ToastProvider` + `toast-rules.ts`
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- Real-time badge updates and polling removal
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The final PR (PR-3) should cover:
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- Integration tests for SSE and lifecycle hooks
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- E2E tests
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- Documentation
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