LacyLights Go Server

A high-performance Go implementation of the LacyLights lighting control system backend. This server provides a GraphQL API for managing theatrical lighting fixtures, scenes, cue lists, and real-time DMX output via Art-Net.

Features

• GraphQL API: Full-featured API for lighting control operations
• Art-Net Support: Real-time DMX output over UDP (Art-Net protocol)
• SQLite Database: Lightweight, embedded database using Prisma-style schema
• Cross-Platform: Builds for Linux (ARM/AMD64), macOS, and Windows
• Raspberry Pi Ready: Optimized for deployment on Raspberry Pi hardware

Quick Start

Prerequisites

• Go 1.21 or later
• Make (optional, for convenience commands)

Build and Run

# Build the server
make build

# Run with default settings
./build/bin/server

# Run with custom settings
DATABASE_URL="file:./data.db" PORT=4000 ./build/bin/server

Environment Variables

Variable	Default	Description
PORT	4000	HTTP server port
DATABASE_URL	file:./lacylights.db	SQLite database path
ARTNET_ENABLED	true	Enable/disable Art-Net output
ARTNET_BROADCAST_ADDRESS	255.255.255.255	Art-Net broadcast address

Development

Project Structure

lacylights-go/
├── cmd/server/          # Main application entry point
├── internal/
│   ├── config/          # Configuration management
│   ├── database/        # Database layer and migrations
│   ├── graph/           # GraphQL resolvers and schema
│   ├── models/          # Domain models
│   └── artnet/          # Art-Net protocol implementation
├── pkg/                 # Public packages
├── test/                # Integration tests
├── go.mod
├── go.sum
└── Makefile

Common Commands

# Run tests
make test

# Run tests with coverage
make test-coverage

# Run linter
make lint

# Generate GraphQL code
make generate

# Build for all platforms
make build-all

# Clean build artifacts
make clean

GraphQL Schema

The GraphQL API is defined in internal/graph/schema.graphqls. After modifying the schema, regenerate the resolver code:

make generate

API Overview

Queries

• projects - List all projects
• project(id: ID!) - Get a specific project
• fixtureDefinitions - List fixture definitions
• systemInfo - Get system status and configuration
• dmxOutput(universe: Int!) - Get current DMX channel values

Mutations

• createProject / updateProject / deleteProject - Project management
• createScene / updateScene / deleteScene - Scene management
• createCueList / addCueToCueList - Cue list management
• startCueList / nextCue / stopCueList - Playback control
• setChannelValue - Direct DMX control
• fadeToBlack - Emergency blackout

Subscriptions

• dmxOutput - Real-time DMX value updates
• playbackStatus - Cue list playback state changes

Building for Raspberry Pi

# Build for Raspberry Pi (ARM64)
GOOS=linux GOARCH=arm64 go build -o lacylights-arm64 ./cmd/server

# Build for older Raspberry Pi (ARM32)
GOOS=linux GOARCH=arm GOARM=7 go build -o lacylights-arm ./cmd/server

Testing

Run unit tests:

make test

Run with coverage report:

make test-coverage
open coverage.html

Project Documentation

For comprehensive implementation plans and architecture decisions, see the parent directory documentation:

• LACYLIGHTS_GO_REWRITE_PLAN.md - Complete Go rewrite implementation plan and architecture
• RASPBERRY_PI_PRODUCT_PLAN.md - Turnkey Raspberry Pi product architecture and deployment
• GO_DISTRIBUTION_PLAN.md - Binary distribution and release workflow coordination
• CONTRACT_TESTING_PLAN.md - Contract test suite for API compatibility verification

Related Repositories

• lacylights-fe - Next.js frontend
• lacylights-mcp - MCP server for AI integration
• lacylights-test - Contract test suite
• lacylights-rpi - Raspberry Pi deployment

License

MIT License - See LICENSE for details.