Languard Server Manager

A multi-game server management platform with a Python/FastAPI backend and React/TypeScript frontend. Currently supports Arma 3 with an extensible adapter system for adding more games.

Tech Stack

Backend

• Python 3.12+ / FastAPI — async REST API
• SQLite with WAL mode — zero-config database
• SQLAlchemy — raw SQL via text() queries (no ORM)
• BattlEye RCon — UDP protocol v2 for remote admin
• APScheduler — background cleanup jobs
• psutil — process monitoring and resource metrics
• JWT (python-jose) + bcrypt — authentication
• Fernet (cryptography) — sensitive config field encryption

Frontend

• React 19 / TypeScript 6 / Vite 8
• TanStack Query v5 — server state management
• Zustand 5 — client state (auth, UI)
• Tailwind CSS — dark neumorphic design system
• Playwright — E2E testing
• Vitest + React Testing Library — unit tests (173 tests)

Quick Start

1 — Backend setup

cd backend

# Create and activate a virtual environment
python -m venv venv
source venv/bin/activate        # macOS / Linux
# venv\Scripts\activate         # Windows (cmd)
# venv\Scripts\Activate.ps1     # Windows (PowerShell)

pip install -r requirements.txt

Generate required secrets (one-time):

# Secret key (JWT signing)
openssl rand -hex 32

# Fernet encryption key (sensitive config fields at rest)
python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"

Copy .env.example to .env and fill in the two keys:

cp .env.example .env   # then open .env in your editor

# .env — minimum required values
LANGUARD_SECRET_KEY=<output of openssl command>
LANGUARD_ENCRYPTION_KEY=<output of Fernet command>
LANGUARD_ARMA3_DEFAULT_EXE=C:/path/to/arma3server_x64.exe

Start the backend (development — auto-reload on file changes):

uvicorn main:app --host 0.0.0.0 --port 8000 --reload

First run prints a randomly-generated admin password to the console. Log in and change it immediately via Settings → Change Password (or PUT /api/auth/password).

• API root: http://localhost:8000
• Interactive docs: http://localhost:8000/docs

Debug in VS Code: add this launch.json configuration:

{
  "name": "Backend — uvicorn",
  "type": "debugpy",
  "request": "launch",
  "module": "uvicorn",
  "args": ["main:app", "--host", "0.0.0.0", "--port", "8000"],
  "cwd": "${workspaceFolder}/backend",
  "env": { "PYTHONDONTWRITEBYTECODE": "1" },
  "jinja": true,
  "justMyCode": false
}

---

2 — Frontend setup

cd frontend
npm install
npm run dev

The Vite dev server starts at http://localhost:5173 and automatically proxies:

• /api/* → http://localhost:8000 (REST)
• /ws/* → ws://localhost:8000 (WebSocket)

Debug in VS Code: install the JavaScript Debugger extension (bundled by default), then add:

{
  "name": "Frontend — Vite (Chrome)",
  "type": "chrome",
  "request": "launch",
  "url": "http://localhost:5173",
  "webRoot": "${workspaceFolder}/frontend/src",
  "sourceMapPathOverrides": {
    "/@fs/*": "${workspaceFolder}/frontend/*"
  }
}

Start the Vite dev server first (npm run dev), then launch this config to attach Chrome DevTools with source-map support.

---

Running Tests

Backend

cd backend
source venv/bin/activate   # (if not already active)

pytest                             # all tests
pytest tests/adapters/arma3/ -v   # adapter tests only
pytest --tb=short -q               # quiet output

Frontend unit tests

cd frontend
npm test                          # single run (CI-friendly)
npm run test:watch                # watch mode during development
npx vitest run --coverage         # with coverage report

Frontend E2E tests (Playwright)

Start the backend and the Vite dev server first, then:

cd frontend
npm run test:e2e              # all E2E tests (headless)
npm run test:e2e:ui           # Playwright UI mode (interactive, great for debugging)
npx playwright test --headed  # watch tests run in an actual browser

Integration tests (require a live backend) live in tests-e2e/integration/. All other tests use API mocks and run without a backend.

Project Structure

languard-servers-manager/
├── backend/
│   ├── main.py                  # FastAPI app factory, lifespan, middleware
│   ├── config.py               # Pydantic Settings (env vars)
│   ├── database.py              # SQLAlchemy engine, migration runner
│   ├── dependencies.py          # FastAPI deps: auth, admin, server, adapter
│   ├── adapters/                # Game adapter system
│   │   ├── protocols.py         # Protocol definitions (7 capabilities)
│   │   ├── registry.py          # GameAdapterRegistry singleton
│   │   ├── exceptions.py        # Typed adapter exceptions
│   │   └── arma3/               # Arma 3 adapter (7/7 capabilities)
│   ├── core/
│   │   ├── auth/                # JWT auth, user CRUD
│   │   ├── servers/             # Server service, routers, process manager
│   │   ├── games/               # Game type discovery
│   │   ├── system/              # Health and status endpoints
│   │   ├── websocket/           # WS manager, broadcast thread
│   │   ├── threads/             # Background thread registry
│   │   ├── dal/                 # Data access layer (repositories)
│   │   ├── jobs/                # APScheduler cleanup jobs
│   │   ├── utils/               # Crypto, file utils, port checker
│   │   └── migrations/          # SQL migration scripts
│   └── requirements.txt
├── frontend/
│   ├── src/
│   │   ├── App.tsx              # Router + auth guard
│   │   ├── pages/               # LoginPage, DashboardPage, ServerDetailPage, CreateServerPage, SettingsPage
│   │   ├── components/         # Sidebar, ServerCard, ConfigEditor, PlayerTable, BanTable, MissionList, ModList, LogViewer, StatusLed
│   │   ├── hooks/               # useServers, useServerDetail, useAuth, useGames, useWebSocket
│   │   ├── store/               # auth.store, ui.store (Zustand)
│   │   ├── lib/                 # api.ts (Axios client)
│   │   └── __tests__/          # Vitest unit tests (173 tests)
│   ├── tests-e2e/               # Playwright E2E tests
│   └── playwright.config.ts
├── API.md                       # REST + WebSocket API reference
├── ARCHITECTURE.md              # System architecture overview
├── DATABASE.md                  # Database schema reference
├── FRONTEND.md                  # Frontend architecture and components
├── MODULES.md                   # Module-by-module reference
└── THREADING.md                 # Background threading model

Environment Variables

Variable	Default	Description
LANGUARD_SECRET_KEY	(required)	JWT signing key
LANGUARD_ENCRYPTION_KEY	(required)	Fernet key for sensitive config fields
LANGUARD_DB_PATH	./languard.db	SQLite database path
LANGUARD_SERVERS_DIR	./servers	Base directory for server data
LANGUARD_HOST	0.0.0.0	Listen host
LANGUARD_PORT	8000	Listen port
LANGUARD_CORS_ORIGINS	["http://localhost:5173"]	CORS allowed origins
LANGUARD_LOG_RETENTION_DAYS	7	Log cleanup retention
LANGUARD_METRICS_RETENTION_DAYS	30	Metrics cleanup retention
LANGUARD_PLAYER_HISTORY_RETENTION_DAYS	90	Player history retention
LANGUARD_JWT_EXPIRE_HOURS	24	JWT token expiry
LANGUARD_ARMA3_DEFAULT_EXE	(required for Arma 3)	Default Arma 3 executable path

Documentation

• ARCHITECTURE.md — System design, component diagram, security model
• API.md — Complete REST + WebSocket API reference
• DATABASE.md — Schema, tables, indexes, migration system
• FRONTEND.md — React component tree, state management, design system
• MODULES.md — File-by-file module reference
• THREADING.md — Background thread model and concurrency