docs(01-01): complete backend scaffold plan — SUMMARY, STATE, ROADMAP, REQUIREMENTS updated
- Created 01-01-SUMMARY.md with full accomplishment record - STATE.md: advanced to plan 2/3, progress 33%, added 3 key decisions - ROADMAP.md: Phase 1 updated to 1/3 summaries (In Progress) - REQUIREMENTS.md: marked INF-01, INF-02, DEV-01, DEV-02, SHW-01, SHW-02 complete
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Claude
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---
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phase: 01-foundation
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plan: 01
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subsystem: backend
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tags: [python, fastapi, pydantic, uvicorn, websocket, nginx, terminal-ui]
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# Dependency graph
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requires: []
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provides:
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- "Python package lightsync/ with all backend modules"
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- "Pydantic v2 DeviceConfig and ShowModel with full schema"
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- "BaseDevice ABC + SK6812/WS2801 concrete implementations"
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- "DeviceRegistry with JSON persistence (devices.json)"
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- "ShowStore with JSON save/load (shows/ directory)"
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- "FastAPI app with lifespan, REST stubs, WebSocket stub"
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- "Terminal-aesthetic frontend shell (DAW skeleton)"
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- "python -m lightsync entry point serving on port 8000"
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affects: [phase-01-02, phase-02, phase-03, phase-04, phase-05, phase-06, phase-07]
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# Tech tracking
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tech-stack:
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added:
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- "FastAPI 0.115+ — web framework, REST, WebSocket, StaticFiles"
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- "uvicorn[standard] 0.34+ — ASGI server with WebSocket support"
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- "Pydantic v2 — model validation and JSON serialization"
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- "aiofiles 24+ — async file I/O for show JSON and device registry"
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- "python-dotenv — HOST/PORT config from .env file"
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- "structlog — structured logging"
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- "hatchling — build backend for pyproject.toml"
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patterns:
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- "lifespan context manager for startup/shutdown (replaces deprecated @app.on_event)"
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- "Module-level registry/show_store refs in main.py — accessed via `import lightsync.main as state`"
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- "StaticFiles LAST — API routes registered before mount to prevent catch-all interception"
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- "Pydantic v2 APIs: model_dump_json(), model_validate_json(), model_validate() — never v1 .json()/.parse_obj()"
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- "BaseDevice ABC + _DEVICE_CLASSES dict — adding new strip type = new file + one dict entry (INF-02)"
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- "pathlib.Path throughout — cross-platform safe file paths"
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- "aiofiles for all file I/O in async contexts — non-blocking"
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key-files:
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created:
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- pyproject.toml
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- .env
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- .gitignore
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- lightsync/__init__.py
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- lightsync/__main__.py
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- lightsync/main.py
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- lightsync/models/__init__.py
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- lightsync/models/device.py
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- lightsync/models/show.py
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- lightsync/devices/__init__.py
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- lightsync/devices/base.py
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- lightsync/devices/sk6812.py
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- lightsync/devices/ws2801.py
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- lightsync/devices/registry.py
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- lightsync/store/__init__.py
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- lightsync/store/show_store.py
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- lightsync/api/__init__.py
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- lightsync/api/devices.py
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- lightsync/api/shows.py
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- lightsync/api/ws.py
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- lightsync/frontend/index.html
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- lightsync/frontend/style.css
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- lightsync/frontend/app.js
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modified: []
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key-decisions:
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- "aiofiles for all JSON file I/O — keeps async handlers non-blocking per research guidance"
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- "Module-level state in main.py for registry/show_store — acceptable for Phase 1, Phase 2 migrates to Depends()"
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- "StaticFiles mounted last — required to prevent catch-all interception of /api/* routes"
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- "encode_animation_cmd stubs return b'' — Phase 3 implements real UDP animation command encoding"
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- ".gitignore excludes devices.json and shows/ — these are runtime data, not source"
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patterns-established:
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- "lifespan context manager for app startup/shutdown"
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- "BaseDevice ABC + _DEVICE_CLASSES registry dict for extensible device type system"
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- "Pydantic v2 serialization patterns (model_dump_json, model_validate_json)"
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- "aiofiles for async file I/O in FastAPI route handlers"
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- "CSS custom properties for terminal aesthetic — all colors via :root vars"
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requirements-completed:
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- INF-01
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- INF-02
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- DEV-01
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- DEV-02
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- SHW-01
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- SHW-02
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# Metrics
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duration: 4min
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completed: 2026-04-05
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---
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# Phase 1 Plan 01: Backend Scaffold Summary
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**FastAPI backend scaffold with Pydantic v2 models, device ABC, JSON persistence stores, REST+WebSocket stubs, and terminal-aesthetic DAW skeleton frontend — all runnable via `python -m lightsync`**
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## Performance
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- **Duration:** ~4 min
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- **Started:** 2026-04-05T18:43:46Z
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- **Completed:** 2026-04-05T18:48:03Z
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- **Tasks:** 2 (both auto)
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- **Files created:** 23
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## Accomplishments
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### Task 1: Package structure, Pydantic models, device abstractions (commit: 061edfc)
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- `pyproject.toml` with all Phase 1 dependencies (FastAPI, uvicorn, Pydantic v2, aiofiles, structlog)
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- `lightsync/models/device.py` — `DeviceConfig` Pydantic model with `StripType` literal, UUID auto-ID, validation constraints
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- `lightsync/models/show.py` — `ShowModel` with `schema_version=1`, `AudioRef`, `TrackModel`, `CueModel`, `AnalysisBlock`
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- `lightsync/devices/base.py` — `BaseDevice` ABC with `encode_frame`, `encode_animation_cmd`, `bytes_per_pixel`
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- `lightsync/devices/sk6812.py` — SK6812 RGBW (4 bytes/pixel), encode_frame builds RGBW bytearray
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- `lightsync/devices/ws2801.py` — WS2801 RGB (3 bytes/pixel), encode_frame builds RGB bytearray
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### Task 2: Registry, show store, FastAPI app, frontend shell (commit: 5e10272)
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- `lightsync/devices/registry.py` — `DeviceRegistry` with `_DEVICE_CLASSES` dict, load/save (aiofiles), add/remove/get/list_all/instantiate
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- `lightsync/store/show_store.py` — `ShowStore` with async save/load, `list_ids()` via glob
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- `lightsync/main.py` — `create_app()` with lifespan hook, API routes registered before `StaticFiles` mount
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- `lightsync/api/devices.py` — `GET /`, `POST /`, `DELETE /{id}` — full CRUD with save-on-write
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- `lightsync/api/shows.py` — `GET /`, `POST /`, `GET /{id}` — create and retrieve shows
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- `lightsync/api/ws.py` — `ConnectionManager` + `/ws` WebSocket endpoint with ack echo
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- `lightsync/frontend/index.html` — DAW skeleton: header, sidebar (DEVICES + ANIMATIONS), TIMELINE main area, TRANSPORT footer
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- `lightsync/frontend/style.css` — Terminal aesthetic: `#0a0a0a` bg, `#00ffff` cyan accent, `border-radius: 0` everywhere, CSS Grid layout
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- `lightsync/frontend/app.js` — `LightSyncClient` WS with reconnect, `loadDevices()` populating device list
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- `.gitignore` — excludes runtime data (`devices.json`, `shows/`), `.venv/`, `__pycache__/`
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## Verification Results
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All verification checks passed:
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- `pip install -e ".[dev]"` — installs successfully
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- `python -c "from lightsync.models.show import ShowModel; s = ShowModel(name='test'); assert s.schema_version == 1"` — passes
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- `python -c "from lightsync.devices.registry import DeviceRegistry; print('OK')"` — passes
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- `python -m lightsync` — starts server on port 8000, serves `GET /api/devices/` → 200 `[]`
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## Task Commits
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| Task | Commit | Description |
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|------|--------|-------------|
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| 1 | 061edfc | Package structure, Pydantic models, device abstractions |
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| 2 | 5e10272 | Registry, show store, FastAPI app, frontend shell |
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## Decisions Made
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- Module-level `registry` and `show_store` refs in `main.py` — acceptable for Phase 1 single-process server; Phase 2 should migrate to `Depends()` for testability
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- `encode_animation_cmd` stubs in SK6812/WS2801 return `b""` — Phase 3 implements real UDP frame encoding
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- Google Fonts (JetBrains Mono) loaded from CDN — offline fallback to Consolas via CSS custom property chain
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## Deviations from Plan
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None — plan executed exactly as written.
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## Known Stubs
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These are intentional per-plan stubs, documented in the plan spec:
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| Stub | File | Line | Reason |
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|------|------|------|--------|
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| `encode_animation_cmd` returns `b""` | lightsync/devices/sk6812.py | 28 | Phase 3 implements real UDP animation command encoding |
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| `encode_animation_cmd` returns `b""` | lightsync/devices/ws2801.py | 26 | Phase 3 implements real UDP animation command encoding |
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| ANIMATIONS panel placeholder | lightsync/frontend/index.html | — | Phase 3+ per design decision D-08 |
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| TIMELINE panel placeholder | lightsync/frontend/index.html | — | Phase 2+ per design decision D-09 |
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| TRANSPORT bar placeholder | lightsync/frontend/index.html | — | Phase 2+ per design decision D-10 |
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All stubs are DAW skeleton placeholders (per D-06 decision: full panel layout from day 1) or device encoding stubs for UDP (Phase 3). They do not prevent the plan's goal from being achieved — the backend scaffold, persistence, and server entry point are fully functional.
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## Next Phase Readiness
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- Ready for 01-02: frontend UI details and static file serving verification
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- Ready for 01-03: Docker deploy to groll.cloud
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- All future phases can import from `lightsync.models`, `lightsync.devices`, `lightsync.store`
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- `_DEVICE_CLASSES` dict ready to receive new strip types in Phase 5
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---
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*Phase: 01-foundation*
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*Completed: 2026-04-05*
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