alexei.dolgolyov
563cbac88c
Two CRITICAL data-safety bugs from the architecture audit and the two
worst parallel-change problems are fixed in one coherent pass.
Audit findings addressed:
- C2 silent CSS response fallback. The previous _RESPONSE_MAP fell
through to a fabricated PictureCSSResponse whenever a source
class lacked an entry; in particular game_event sources were
silently mis-shaped. Now: GameEventCSSResponse/Create/Update
schemas exist, _RESPONSE_MAP is re-keyed by source_type string,
an import-time _assert_response_map_coverage() requires symmetric
agreement with storage._SOURCE_TYPE_MAP, and the runtime path
raises instead of fabricating a response.
- C11 string-replace JSON migration. ColorStripStore used
blob.replace('"source_type": "static"', '"source_type":
"single_color"') which can corrupt unrelated substrings (e.g.
an animation type named "static_wave") and provides no audit,
no transaction, no idempotency. Replaced with
storage.data_migrations.MigrationRunner backed by a
data_migrations audit table. Each migration runs inside one
db.transaction() that covers the applied-check, the apply(),
and the audit-INSERT — partial failures roll back atomically.
StaticToSingleColorMigration parses each row with json.loads
and mutates only the source_type field. Frozen-write databases
skip with a warning.
- C3+C4 color-strip stream dispatch. The 7-branch elif in
ColorStripStreamManager.acquire() and the duplicate one in
ws_stream._create_stream() now share a single STREAM_BUILDERS
registry in core.processing.color_strip_kinds, keyed by
source.source_type. Both call sites populate a StreamDeps bag
and delegate to build_stream(). _assert_stream_kind_coverage()
asserts at import that STREAM_BUILDERS plus SHARABLE_KINDS
partitions storage._SOURCE_TYPE_MAP. ws_stream's preview path
wraps each FastAPI-DI getter in _safe() so non-audio previews
no longer crash when audio/CSPT stores are not wired.
- C6+C7 value stream dispatch. The 14-branch isinstance ladder in
ValueStreamManager._create_stream and its silent
StaticValueStream(value=1.0) fallback are replaced by
core.processing.value_kinds.STREAM_BUILDERS, keyed by
source_type string (so AdaptiveValueSource's adaptive_time and
adaptive_scene route to different builders correctly). The
manager retains only the SyncClockRuntime pre-acquisition step
for animated_color (kinds needing this are listed explicitly
in NEEDS_CLOCK_RUNTIME). Symmetric coverage assertion plus a
separate assertion that NEEDS_CLOCK_RUNTIME is a subset of the
registry.
Bundled in: the static->single_color rename plus the HTTPValueStream
/ http_endpoint introduction that were already in flight on this
branch share these files; the registry refactor naturally absorbs
both via the new "single_color" / "static" alias entries and the
_build_http builder.
Tests: 26 new tests cover response-map coverage drift, migration
runner audit-table mechanics + transactional rollback +
frozen-write skip, and the two stream-builder registries. 343
existing storage / API / e2e tests stay green. Ruff clean.
LED Grab
Ambient lighting system that captures screen content and drives LED strips in real time. Supports WLED, Adalight, AmbileD, and DDP devices with audio-reactive effects, pattern generation, and automated profile switching.
What It Does
The server captures pixels from a screen (or Android device via ADB), extracts border colors, applies post-processing filters, and streams the result to LED strips at up to 60 fps. A built-in web dashboard provides device management, calibration, live LED preview, and real-time metrics — no external UI required.
A Home Assistant integration exposes devices as entities for smart home automation.
Features
Screen Capture
- Multi-monitor support with per-target display selection
- 6 capture engine backends — MSS (cross-platform), DXCam, BetterCam, Windows Graphics Capture (Windows), Scrcpy (Android via ADB), Camera/Webcam (OpenCV)
- Configurable capture regions, FPS, and border width
- Capture templates for reusable configurations
LED Device Support
- WLED (HTTP/UDP) with mDNS auto-discovery
- Adalight (serial) — Arduino-compatible LED controllers
- AmbileD (serial)
- DDP (Distributed Display Protocol, UDP)
- OpenRGB — PC peripherals (keyboard, mouse, RAM, fans, LED strips)
- Serial port auto-detection and baud rate configuration
Color Processing
- Post-processing filter pipeline: brightness, gamma, saturation, color correction, auto-crop, frame interpolation, pixelation, flip
- Reusable post-processing templates
- Color strip sources: audio-reactive, pattern generator, composite layering, audio-to-color mapping
- Pattern templates with customizable effects
Audio Integration
- Multichannel audio capture from any system device (input or loopback)
- WASAPI engine on Windows, Sounddevice (PortAudio) engine on Linux/macOS
- Per-channel mono extraction
- Audio-reactive color strip sources driven by frequency analysis
Automation
- Profile engine with condition-based switching (time of day, active window, etc.)
- Dynamic brightness value sources (schedule-based, scene-aware)
- Key Colors (KC) targets with live WebSocket color streaming
Dashboard
- Web UI at
http://localhost:8080— no installation needed on the client side - Progressive Web App (PWA) — installable on phones and tablets with offline caching
- Responsive mobile layout with bottom tab navigation
- Device management with auto-discovery wizard
- Visual calibration editor with overlay preview
- Live LED strip preview via WebSocket
- Real-time FPS, latency, and uptime charts
- Localized in English, Russian, and Chinese
Home Assistant Integration
- HACS-compatible custom component
- Light, switch, sensor, and number entities per device
- Real-time metrics via data coordinator
- WebSocket-based live LED preview in HA
Requirements
- Python 3.11+ (or Docker)
- A supported LED device on the local network or connected via USB
- Windows, Linux, or macOS — all core features work cross-platform
Platform Notes
| Feature | Windows | Linux / macOS |
|---|---|---|
| Screen capture | DXCam, BetterCam, WGC, MSS | MSS |
| Webcam capture | OpenCV (DirectShow) | OpenCV (V4L2) |
| Audio capture | WASAPI, Sounddevice | Sounddevice (PulseAudio/PipeWire) |
| GPU monitoring | NVIDIA (pynvml) | NVIDIA (pynvml) |
| Android capture | Scrcpy (ADB) | Scrcpy (ADB) |
| Monitor names | Friendly names (WMI) | Generic ("Display 0") |
| Profile conditions | Process/window detection | Not yet implemented |
Quick Start
Docker (recommended)
git clone https://git.dolgolyov-family.by/alexei.dolgolyov/ledgrab.git
cd ledgrab/server
docker compose up -d
Manual
Requires Python 3.11+ and Node.js 18+.
git clone https://git.dolgolyov-family.by/alexei.dolgolyov/ledgrab.git
cd ledgrab/server
# Build the frontend bundle
npm ci && npm run build
# Create a virtual environment and install
python -m venv venv
source venv/bin/activate # Linux/Mac
# venv\Scripts\activate # Windows
pip install .
# Start the server
export PYTHONPATH=$(pwd)/src # Linux/Mac
# set PYTHONPATH=%CD%\src # Windows
uvicorn ledgrab.main:app --host 0.0.0.0 --port 8080
Open http://localhost:8080 to access the dashboard.
Important: The default API key is
development-key-change-in-production. Change it before exposing the server outside localhost. See INSTALLATION.md for details.
See INSTALLATION.md for the full installation guide, including configuration, Docker manual builds, and Home Assistant setup.
Demo Mode
Demo mode runs the server with virtual devices, sample data, and isolated storage — useful for exploring the UI without real hardware.
Set the LEDGRAB_DEMO environment variable to true, 1, or yes:
# Docker
docker compose run -e LEDGRAB_DEMO=true server
# Python
LEDGRAB_DEMO=true uvicorn ledgrab.main:app --host 0.0.0.0 --port 8081
# Windows (installed app)
set LEDGRAB_DEMO=true
LedGrab.bat
Demo mode uses port 8081, config file config/demo_config.yaml, and stores data in data/demo/ (separate from production data). It can run alongside the main server.
Architecture
ledgrab/
├── server/ # Python FastAPI backend
│ ├── src/ledgrab/
│ │ ├── main.py # Application entry point
│ │ ├── config.py # YAML + env var configuration
│ │ ├── api/
│ │ │ ├── routes/ # REST + WebSocket endpoints
│ │ │ └── schemas/ # Pydantic request/response models
│ │ ├── core/
│ │ │ ├── capture/ # Screen capture, calibration, pixel processing
│ │ │ ├── capture_engines/ # MSS, DXCam, BetterCam, WGC, Scrcpy, Camera backends
│ │ │ ├── devices/ # WLED, Adalight, AmbileD, DDP, OpenRGB clients
│ │ │ ├── audio/ # Audio capture engines
│ │ │ ├── filters/ # Post-processing filter pipeline
│ │ │ ├── processing/ # Stream orchestration and target processors
│ │ │ └── profiles/ # Condition-based profile automation
│ │ ├── storage/ # JSON-based persistence layer
│ │ ├── static/ # Web dashboard (vanilla JS, CSS, HTML)
│ │ │ ├── js/core/ # API client, state, i18n, modals, events
│ │ │ ├── js/features/ # Feature modules (devices, streams, targets, etc.)
│ │ │ ├── css/ # Stylesheets
│ │ │ └── locales/ # en.json, ru.json, zh.json
│ │ └── utils/ # Logging, monitor detection
│ ├── config/ # default_config.yaml
│ ├── tests/ # pytest suite
│ ├── Dockerfile
│ └── docker-compose.yml
├── docs/
│ ├── API.md # REST API reference
│ └── CALIBRATION.md # LED calibration guide
├── INSTALLATION.md
└── LICENSE # MIT
Configuration
Edit server/config/default_config.yaml or use environment variables with the LEDGRAB_ prefix:
server:
host: "0.0.0.0"
port: 8080
log_level: "INFO"
auth:
api_keys:
dev: "development-key-change-in-production"
storage:
devices_file: "data/devices.json"
templates_file: "data/capture_templates.json"
logging:
format: "json"
file: "logs/ledgrab.log"
max_size_mb: 100
Environment variable override example: LEDGRAB_SERVER__PORT=9090.
API
The server exposes a REST API (with Swagger docs at /docs) covering:
- Devices — CRUD, discovery, validation, state, metrics
- Capture Templates — Screen capture configurations
- Picture Sources — Screen capture stream definitions
- Picture Targets — LED target management, start/stop processing
- Post-Processing Templates — Filter pipeline configurations
- Color Strip Sources — Audio, pattern, composite, mapped sources
- Audio Sources — Multichannel and mono audio device configuration
- Pattern Templates — Effect pattern definitions
- Value Sources — Dynamic brightness/value providers
- Key Colors Targets — KC targets with WebSocket live color stream
- Profiles — Condition-based automation profiles
All endpoints require API key authentication via X-API-Key header or ?token= query parameter.
See docs/API.md for the full reference.
Calibration
The calibration system maps screen border pixels to physical LED positions. Configure layout direction, start position, and per-edge segments through the web dashboard or API.
See docs/CALIBRATION.md for a step-by-step guide.
Home Assistant
For Home Assistant integration, see the separate ledgrab-haos-integration repository.
Development
cd server
# Install with dev dependencies
pip install -e ".[dev]"
# Run tests
pytest
# Format and lint
black src/ tests/
ruff check src/ tests/
Optional extras:
pip install -e ".[perf]" # High-performance capture engines (Windows)
pip install -e ".[camera]" # Webcam capture via OpenCV
License
MIT — see LICENSE.