GameMatcher

A simple, matchmaking server designed with Bun that provides queue-based matchmaking functionality for multiplayer games.

Designed with Roblox in mind, but can be used for any game that needs a matchmaking system.

Features

• Clustering Support: Automatically uses all available CPU cores for handling high traffic
• Queue Management: Join and leave matchmaking queues with custom parameters
• Configurable Matchmaking: Define match sizes, team structures, and ranking algorithms
• MongoDB Integration: Store and manage matchmaking state
• API Versioning: Current API is under v1 namespace
• Error Handling: Consistent error responses across the API
• Health Monitoring: Endpoint for service health checks

Project Structure

GameMatcher/
├── src/                     # Source code
│   ├── index.ts             # Entry point and server setup
│   ├── modules/             # Core functionality modules
│   │   ├── config.ts        # Configuration settings
│   │   ├── database.ts      # MongoDB connection
│   │   ├── matchmaking/     # Matchmaking logic
│   ├── middlewares/         # Express middlewares
│   ├── routes/              # API routes
│   │   ├── v1/              # Version 1 API endpoints
│   ├── schemas/             # Data validation schemas
│   ├── types/               # TypeScript type definitions
├── tests/                   # Test files
├── Dockerfile               # Docker configuration

Installation

Prerequisites

• Bun runtime
• MongoDB instance

Setup

1. Clone the repository:

git clone https://github.com/iamEvanYT/GameMatcher.git
cd GameMatcher

2. Install dependencies:

bun install

3. Configure environment variables:

Create a .env file in the root directory with the following variables:

# Required
MongoUrl=mongodb://localhost:27017
AuthKey=your_auth_key

# Optional
Port=3000                     # Default: 3000
Environment=Development       # Default: Testing
MATCHMAKING_ENABLED=true      # Enable/disable matchmaking
Instances=4                   # Number of worker instances (defaults to CPU count - 1)

Running

Development Mode

Run with automatic restart on file changes:

bun dev

Production Mode

bun start

Docker

Build the Docker image:

docker build -t gamematcher .

Run the container:

docker run -p 3000:3000 -e MongoUrl=mongodb://host.docker.internal:27017 -e AuthKey=your_auth_key gamematcher

API Endpoints

Healthcheck

GET /v1/healthcheck

Returns the health status of the service.

Join Queue

POST /v1/join-queue

Adds a player or party to the matchmaking queue.

Request body:

{
  "userId": "string",
  "queueId": "Ranked2v2",
  "partyId": "string", // Optional
  "rating": 1200 // Optional
}

Leave Queue

POST /v1/leave-queue

Removes a player or party from the matchmaking queue.

Request body:

{
  "userId": "string",
  "queueId": "Ranked2v2"
}

Queues Configuration

Queues are configured in src/modules/config.ts. The default configuration includes:

{
  queueId: "Ranked2v2",    // Unique queue identifier
  queueType: "ranked",     // Queue type (ranked, casual, etc.)
  usersPerTeam: 2,         // Number of players per team
  teamsPerMatch: 2,        // Number of teams per match
  discoverMatchesInterval: 5, // How often to check for matches (seconds)
  searchRange: [0, 0],     // Initial rating range to search
  incrementRange: [1, 1]   // How much to expand range per iteration
}

License

This project is licensed under the terms found in the LICENSE file.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.