mcp-init

Okay, here's a basic outline and code snippets for creating a new MCP (Minecraft Protocol) server in TypeScript, with some "batteries included" features like basic logging, player management, and simple command handling. This is a starting point; a full MCP server is a complex project. **Conceptual Outline** 1. **Project Setup:** Initialize a TypeScript project with necessary dependencies. 2. **Networking:** Set up a TCP server to listen for incoming Minecraft client connections. 3. **Protocol Handling:** Implement the Minecraft protocol (handshaking, status, login, play). This is the most complex part. We'll use a library to help. 4. **Player Management:** Track connected players, their usernames, UUIDs, and game state. 5. **Command Handling:** Parse and execute simple commands entered by players. 6. **World Simulation (Optional):** A very basic world representation (e.g., a flat plane) to allow players to move around. 7. **Logging:** Implement a basic logging system for debugging and monitoring. **Code Snippets (TypeScript)** **1. Project Setup** ```bash mkdir mcp-server cd mcp-server npm init -y npm install typescript ts-node ws uuid node-nbt --save # Core dependencies npm install @types/node @types/ws @types/uuid --save-dev # Type definitions tsc --init # Initialize TypeScript config ``` **`tsconfig.json` (Example)** ```json { "compilerOptions": { "target": "es2020", "module": "commonjs", "outDir": "./dist", "rootDir": "./src", "strict": true, "esModuleInterop": true, "skipLibCheck": true, "forceConsistentCasingInFileNames": true, "resolveJsonModule": true }, "include": ["src/**/*"], "exclude": ["node_modules"] } ``` **2. `src/index.ts` (Main Server File)** ```typescript import { WebSocketServer, WebSocket } from 'ws'; import { v4 as uuidv4 } from 'uuid'; import * as nbt from 'node-nbt'; // Basic Logging const log = (message: string) => { console.log(`[${new Date().toISOString()}] ${message}`); }; // Player Interface interface Player { id: string; username: string; socket: WebSocket; x: number; y: number; z: number; } // Server Configuration const SERVER_PORT = 25565; const SERVER_MOTD = "My Awesome MCP Server"; const MAX_PLAYERS = 10; // Global Server State const players: { [id: string]: Player } = {}; // Function to handle incoming messages from clients const handleClientMessage = (ws: WebSocket, message: string) => { try { const data = JSON.parse(message); // Assuming JSON format for simplicity if (data.type === 'chat') { const playerId = Object.keys(players).find(key => players[key].socket === ws); if (playerId) { const player = players[playerId]; const chatMessage = `<${player.username}> ${data.message}`; log(chatMessage); broadcast(chatMessage); // Broadcast to all players } } else if (data.type === 'position') { const playerId = Object.keys(players).find(key => players[key].socket === ws); if (playerId) { const player = players[playerId]; player.x = data.x; player.y = data.y; player.z = data.z; // Broadcast position update (optional) // broadcastPosition(player); } } else { log(`Unknown message type: ${data.type}`); } } catch (error) { log(`Error parsing message: ${error}`); } }; // Function to broadcast a message to all connected clients const broadcast = (message: string) => { for (const playerId in players) { if (players.hasOwnProperty(playerId)) { const player = players[playerId]; player.socket.send(JSON.stringify({ type: 'chat', message: message })); } } }; // Function to handle new client connections const handleNewConnection = (ws: WebSocket) => { const playerId = uuidv4(); let username = `Player${Object.keys(players).length + 1}`; // Default username log(`New connection from ${ws._socket.remoteAddress}, assigning ID: ${playerId}`); // Add the player to the players object players[playerId] = { id: playerId, username: username, socket: ws, x: 0, y: 0, z: 0, }; // Send a welcome message to the new player ws.send(JSON.stringify({ type: 'welcome', message: `Welcome to the server, ${username}!` })); // Notify other players about the new player (optional) broadcast(`${username} has joined the server.`); // Set up event listeners for the new connection ws.on('message', (message) => { handleClientMessage(ws, message.toString()); }); ws.on('close', () => { log(`Connection closed for player ${playerId}`); delete players[playerId]; broadcast(`${username} has left the server.`); }); ws.on('error', (error) => { log(`Error on connection ${playerId}: ${error}`); delete players[playerId]; }); }; // Create a WebSocket server const wss = new WebSocketServer({ port: SERVER_PORT }); wss.on('connection', handleNewConnection); wss.on('listening', () => { log(`Server listening on port ${SERVER_PORT}`); }); wss.on('error', (error) => { log(`Server error: ${error}`); }); // Start the server log(`Starting MCP server...`); ``` **3. Building and Running** ```bash npm run build # Transpile TypeScript to JavaScript (check your package.json for the build script) node dist/index.js # Run the server ``` **Explanation and "Batteries Included" Features:** * **`ws` Library:** Uses the `ws` library for WebSocket communication, which is a common choice for real-time applications. This handles the low-level socket management. * **`uuid` Library:** Generates unique player IDs using the `uuid` library. * **`node-nbt` Library:** This is included for handling NBT (Named Binary Tag) data, which is used for storing world data, player data, and other Minecraft-related information. You'll need this for more advanced features. * **Logging:** A simple `log` function provides basic timestamped logging to the console. * **Player Management:** The `players` object stores information about connected players (ID, username, socket, position). * **Chat:** Basic chat functionality is implemented. Players can send messages, and the server broadcasts them to all other players. * **Position Updates:** The server can receive position updates from clients, although the example doesn't do anything with them beyond storing them. * **Error Handling:** Basic error handling is included for connection errors and message parsing errors. **Important Considerations and Next Steps:** * **Minecraft Protocol:** This example *does not* implement the full Minecraft protocol. You'll need to handle the handshake, status, login, and play states correctly. Libraries like `prismarine-protocol` (Node.js) can help with this, but they are complex. The example uses a simplified JSON-based communication for demonstration. * **Security:** This is a very basic example and has no security measures. You'll need to implement proper authentication, authorization, and input validation to prevent malicious clients from exploiting the server. * **World Generation:** The example doesn't have any world generation. You'll need to implement a world generator to create a playable environment. Consider using libraries for procedural generation. * **Game Logic:** You'll need to implement the game logic for your server, such as handling player movement, interactions with the world, and other game events. * **Performance:** For a large number of players, you'll need to optimize the server's performance. Consider using techniques like multithreading or clustering. * **Data Storage:** You'll need to store world data, player data, and other server data in a persistent storage system, such as a database or file system. * **Command System:** Expand the command handling to support more complex commands and permissions. **Example Client (Simple WebSocket Client)** You'll need a client to connect to your server. Here's a very basic HTML/JavaScript example: ```html <!DOCTYPE html> <html> <head> <title>MCP Client</title> </head> <body> <h1>MCP Client</h1> <input type="text" id="messageInput" placeholder="Enter message"> <button onclick="sendMessage()">Send</button> <div id="chatLog"></div> <script> const ws = new WebSocket('ws://localhost:25565'); // Replace with your server address ws.onopen = () => { console.log('Connected to server'); }; ws.onmessage = (event) => { const data = JSON.parse(event.data); const chatLog = document.getElementById('chatLog'); if (data.type === 'chat') { chatLog.innerHTML += `<p>${data.message}</p>`; } else if (data.type === 'welcome') { chatLog.innerHTML += `<p>${data.message}</p>`; } else { console.log('Received:', data); } }; ws.onclose = () => { console.log('Disconnected from server'); }; ws.onerror = (error) => { console.error('WebSocket error:', error); }; function sendMessage() { const messageInput = document.getElementById('messageInput'); const message = messageInput.value; ws.send(JSON.stringify({ type: 'chat', message: message })); messageInput.value = ''; } </script> </body> </html> ``` Save this as `index.html` and open it in your browser. You should be able to connect to the server and send chat messages. **In summary, this is a very basic starting point. Building a full MCP server is a significant undertaking that requires a deep understanding of the Minecraft protocol and server-side development concepts.** Use this as a foundation and build upon it, researching the Minecraft protocol and using appropriate libraries to handle the complexities. Good luck!