Mcp-server-v2ex

Okay, here's a simplified explanation of how to build a basic Minecraft Protocol (MCP) server using TypeScript, focusing on the core concepts and a minimal example. Keep in mind that a full MCP server is a complex undertaking, and this is just a starting point. **Conceptual Overview** 1. **Minecraft Protocol (MCP):** Minecraft clients and servers communicate using a specific binary protocol. You need to understand the structure of packets (data messages) defined by this protocol. The protocol changes with each Minecraft version. [Wiki.vg](https://wiki.vg/Protocol) is *the* resource for protocol information. 2. **TCP Socket Server:** Your server will listen for incoming TCP connections from Minecraft clients. 3. **Packet Handling:** When a client connects, your server needs to: * Receive data from the socket. * Parse the data into MCP packets. * Process the packets (e.g., handle handshake, login, player movement). * Construct appropriate response packets. * Send the response packets back to the client. 4. **TypeScript:** TypeScript adds static typing to JavaScript, making your code more maintainable and easier to reason about. **Simplified Example (Conceptual - Requires Libraries)** This example outlines the basic structure. You'll need to install libraries for socket handling, data serialization/deserialization (for MCP packets), and potentially logging. ```typescript import * as net from 'net'; // You'll need to install a library for handling Minecraft packets. // Example: npm install prismarine-packet // import { createSerializer, createDeserializer } from 'prismarine-packet'; const serverPort = 25565; // Default Minecraft port // Basic server information (for the server list ping) const serverDescription = "My Simple TS Server"; const maxPlayers = 10; const onlinePlayers = 0; const protocolVersion = 763; // Example: Minecraft 1.17.1 protocol version const minecraftVersion = "1.17.1"; // Create the TCP server const server = net.createServer((socket) => { console.log('Client connected:', socket.remoteAddress, socket.remotePort); // **Packet Handling (Simplified)** socket.on('data', (data) => { // In a real server, you'd: // 1. Deserialize the data into a Minecraft packet. // 2. Determine the packet type (e.g., Handshake, Login Start). // 3. Process the packet based on its type. // 4. Construct a response packet. // 5. Serialize the response packet. // 6. Send the serialized data back to the client. // **Extremely Simplified Example: Responding to a Handshake (Very Incomplete)** // This is just to illustrate the concept. It's not a complete handshake implementation. const packetId = data[0]; // Assuming the first byte is the packet ID if (packetId === 0x00) { // Handshake packet ID (This is version-dependent!) console.log("Received Handshake"); // **In reality, you'd parse the handshake data to get the protocol version, server address, and port.** // **Create a Status Response (Server List Ping)** const statusResponse = { version: { name: minecraftVersion, protocol: protocolVersion }, players: { max: maxPlayers, online: onlinePlayers, sample: [] // Player list (optional) }, description: { text: serverDescription } }; // **Serialize the status response to JSON** const statusResponseJson = JSON.stringify(statusResponse); // **Create the Status Response packet (0x00)** // **This is where you'd use a proper packet serialization library.** // **The following is a placeholder and WILL NOT WORK without proper serialization.** const responsePacket = Buffer.from([ 0x00, // Packet ID (Status Response) statusResponseJson.length, // Length of the JSON string (This needs to be properly encoded) ...Buffer.from(statusResponseJson, 'utf8') // The JSON string itself ]); // Send the response socket.write(responsePacket); // Request socket.once('data', (requestData) => { if (requestData[0] === 0x00) { console.log("Received Request"); const pongResponse = Buffer.from([ 0x01, // Pong packet ID 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 // Payload (timestamp) ]); socket.write(pongResponse); socket.end(); } }); } else { console.log("Received unknown packet ID:", packetId); } }); socket.on('close', () => { console.log('Client disconnected:', socket.remoteAddress, socket.remotePort); }); socket.on('error', (err) => { console.error('Socket error:', err); }); }); // Start the server server.listen(serverPort, () => { console.log(`Server listening on port ${serverPort}`); }); ``` **Important Considerations and Next Steps** * **Minecraft Protocol Library:** You *absolutely* need a library to handle the Minecraft protocol. `prismarine-packet` is a popular choice, but there are others. This library will handle the complex serialization and deserialization of packets. Install it with `npm install prismarine-packet`. You'll need to adapt the example code to use the library's functions. * **Protocol Version:** The Minecraft protocol changes with each version. Make sure you're using the correct protocol version for the Minecraft client you're testing with. [Wiki.vg](https://wiki.vg/Protocol_version_IDs) lists protocol version IDs. * **Error Handling:** The example has minimal error handling. You need to add robust error handling to catch exceptions and prevent your server from crashing. * **Asynchronous Operations:** Use `async/await` or Promises to handle asynchronous operations (like socket reads and writes) properly. * **State Management:** You'll need to manage the state of each connected client (e.g., their username, position, inventory). * **Security:** Implement security measures to prevent exploits and attacks. * **World Generation:** If you want a playable world, you'll need to implement world generation. * **Multiplayer:** Handling multiple players concurrently adds significant complexity. **How to Run** 1. **Install Node.js:** Make sure you have Node.js installed. 2. **Create a Project:** Create a directory for your project and run `npm init -y` to create a `package.json` file. 3. **Install Dependencies:** `npm install net prismarine-packet` (or your chosen packet library). You might need other dependencies as you develop. 4. **Save the Code:** Save the TypeScript code as a `.ts` file (e.g., `server.ts`). 5. **Compile:** Compile the TypeScript code to JavaScript: `tsc server.ts` (you might need to configure `tsconfig.json` first). 6. **Run:** Run the server: `node server.js` **In summary, this is a very basic outline. Building a real Minecraft server is a significant project. Start small, focus on understanding the protocol, and use libraries to help you.**