Server

Okay, here's a basic outline and code snippets for a simple "Weather MCP" (presumably meaning "Minecraft Protocol") server in Python. I'll break it down into sections and explain the key concepts. Keep in mind that this is a *very* simplified example and doesn't implement the full Minecraft protocol. It's designed to illustrate the core idea of a server that responds to Minecraft client requests with weather data. **Important Considerations:** * **Minecraft Protocol Complexity:** The actual Minecraft protocol is complex and constantly evolving. This example *does not* implement it fully. It's a simplified demonstration. For real Minecraft server development, you'd need a robust library like `mcstatus` or a more complete server implementation. * **MCP (Minecraft Coder Pack):** MCP is primarily for *modding* the Minecraft client and server, not for creating entirely new servers. I'm assuming you're using "MCP" loosely to mean "something that interacts with Minecraft." * **Weather Data Source:** This example uses a placeholder for weather data. You'll need to integrate a real weather API (e.g., OpenWeatherMap, AccuWeather) to get actual weather information. * **Security:** This is a basic example and doesn't include any security measures. Real Minecraft servers need proper security to prevent exploits. **Conceptual Outline:** 1. **Socket Setup:** Create a TCP socket to listen for incoming connections from Minecraft clients (or a proxy/mod that simulates a client). 2. **Client Connection Handling:** When a client connects, accept the connection and create a new thread or process to handle it. 3. **Simplified Protocol:** Define a very simple protocol for the client to request weather data. For example, the client might send a specific string like "WEATHER_REQUEST". 4. **Weather Data Retrieval:** When a request is received, fetch weather data from your chosen source (API or placeholder). 5. **Response Formatting:** Format the weather data into a string or a simple data structure that the client can understand. 6. **Sending the Response:** Send the formatted weather data back to the client through the socket. 7. **Closing the Connection:** Close the connection with the client. **Python Code (Illustrative Example):** ```python import socket import threading import time # For simulating weather updates import random # For simulating weather updates # Configuration HOST = '127.0.0.1' # Listen on localhost PORT = 25566 # Choose a port (not the default Minecraft port) WEATHER_REQUEST_COMMAND = "WEATHER_REQUEST" SIMULATE_WEATHER = True # Set to False if using a real API # Placeholder for weather data (replace with API integration) weather_data = { "temperature": 25, "condition": "Clear", "humidity": 60 } def update_weather(): """Simulates weather updates (replace with API calls).""" global weather_data while SIMULATE_WEATHER: weather_data["temperature"] = random.randint(15, 35) conditions = ["Clear", "Rain", "Cloudy", "Thunderstorm"] weather_data["condition"] = random.choice(conditions) weather_data["humidity"] = random.randint(40, 80) print(f"Weather updated: {weather_data}") time.sleep(60) # Update every 60 seconds def handle_client(conn, addr): """Handles a single client connection.""" print(f"Connected by {addr}") try: while True: data = conn.recv(1024) # Receive up to 1024 bytes if not data: break # Client disconnected message = data.decode('utf-8').strip() print(f"Received: {message}") if message == WEATHER_REQUEST_COMMAND: # Format the weather data into a string weather_string = f"Temperature: {weather_data['temperature']}°C, Condition: {weather_data['condition']}, Humidity: {weather_data['humidity']}%" conn.sendall(weather_string.encode('utf-8')) else: conn.sendall("Unknown command".encode('utf-8')) except Exception as e: print(f"Error handling client: {e}") finally: conn.close() print(f"Connection closed with {addr}") def start_server(): """Starts the weather server.""" server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # Avoid address already in use error try: server_socket.bind((HOST, PORT)) server_socket.listen() print(f"Weather server listening on {HOST}:{PORT}") # Start the weather update thread if SIMULATE_WEATHER: weather_thread = threading.Thread(target=update_weather) weather_thread.daemon = True # Exit when the main thread exits weather_thread.start() while True: conn, addr = server_socket.accept() client_thread = threading.Thread(target=handle_client, args=(conn, addr)) client_thread.start() except Exception as e: print(f"Server error: {e}") finally: server_socket.close() if __name__ == "__main__": start_server() ``` **Explanation:** 1. **Imports:** Imports necessary modules: `socket` for network communication, `threading` for handling multiple clients concurrently, `time` for simulating weather updates, and `random` for generating random weather data. 2. **Configuration:** * `HOST`: The IP address to listen on (localhost in this case). * `PORT`: The port number to listen on. Choose a port that's not already in use. *Do not use the default Minecraft port (25565) unless you know what you're doing.* * `WEATHER_REQUEST_COMMAND`: The string that the client sends to request weather data. * `SIMULATE_WEATHER`: A flag to control whether to simulate weather updates or use a real API. 3. **`weather_data`:** A dictionary to store the current weather information. This is a placeholder; you'll replace this with data from a real weather API. 4. **`update_weather()`:** This function simulates weather updates. It randomly changes the temperature, condition, and humidity every 60 seconds. *Replace this with code that calls a weather API.* The `time.sleep(60)` call pauses the thread for 60 seconds. The `weather_thread.daemon = True` line ensures that the thread exits when the main program exits. 5. **`handle_client(conn, addr)`:** This function handles the communication with a single client. * It receives data from the client using `conn.recv(1024)`. * It decodes the data from bytes to a string using `data.decode('utf-8')`. * It checks if the received message is the `WEATHER_REQUEST_COMMAND`. * If it is, it formats the weather data into a string and sends it back to the client using `conn.sendall(weather_string.encode('utf-8'))`. The `encode('utf-8')` converts the string to bytes before sending. * If the message is not recognized, it sends an "Unknown command" message. * It closes the connection using `conn.close()`. 6. **`start_server()`:** This function sets up the server socket and listens for incoming connections. * It creates a TCP socket using `socket.socket(socket.AF_INET, socket.SOCK_STREAM)`. * It binds the socket to the specified host and port using `server_socket.bind((HOST, PORT))`. * It starts listening for connections using `server_socket.listen()`. * It enters a loop that accepts incoming connections using `server_socket.accept()`. * For each connection, it creates a new thread to handle the client using `threading.Thread(target=handle_client, args=(conn, addr))`. * It starts the thread using `client_thread.start()`. * The `server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)` line is important. It allows you to quickly restart the server after it crashes or is stopped without getting an "Address already in use" error. 7. **`if __name__ == "__main__":`:** This ensures that the `start_server()` function is only called when the script is run directly (not when it's imported as a module). **How to Run:** 1. Save the code as a Python file (e.g., `weather_server.py`). 2. Run the script from your terminal: `python weather_server.py` **Client-Side (Simplified Example - Requires Modification for Minecraft):** This is a *very* basic Python client to test the server. **This will NOT work directly with Minecraft.** You'll need to adapt it to send the request from within a Minecraft mod or through a proxy. ```python import socket HOST = '127.0.0.1' PORT = 25566 WEATHER_REQUEST_COMMAND = "WEATHER_REQUEST" with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s: s.connect((HOST, PORT)) s.sendall(WEATHER_REQUEST_COMMAND.encode('utf-8')) data = s.recv(1024) print('Received:', repr(data.decode('utf-8'))) ``` **Important Notes and Next Steps:** * **Minecraft Integration:** The biggest challenge is integrating this with Minecraft. You'll need to: * **Create a Minecraft Mod:** This is the most common approach. Your mod would need to: * Establish a connection to your Python server. * Send the `WEATHER_REQUEST_COMMAND`. * Receive the weather data. * Display the weather data in the game (e.g., in the chat, on a custom GUI). * **Use a Proxy:** You could create a proxy server that sits between the Minecraft client and the real Minecraft server. The proxy would intercept weather-related packets and replace them with data from your Python server. This is more complex. * **Weather API Integration:** Replace the placeholder weather data with calls to a real weather API. You'll need to: * Sign up for an API key from a weather service (e.g., OpenWeatherMap). * Install the `requests` library: `pip install requests` * Modify the `update_weather()` function to make API calls. * **Error Handling:** Add more robust error handling to the server and client code. * **Data Formatting:** Consider using a more structured data format like JSON for sending weather data between the server and client. This will make it easier to parse the data on the client side. * **Security:** Implement security measures to protect your server from unauthorized access. **Example of Weather API Integration (OpenWeatherMap):** ```python import requests # Replace with your OpenWeatherMap API key API_KEY = "YOUR_OPENWEATHERMAP_API_KEY" CITY = "London" # Or any city you want def get_weather_from_api(): """Gets weather data from OpenWeatherMap.""" url = f"http://api.openweathermap.org/data/2.5/weather?q={CITY}&appid={API_KEY}&units=metric" try: response = requests.get(url) response.raise_for_status() # Raise HTTPError for bad responses (4xx or 5xx) data = response.json() weather_data = { "temperature": data["main"]["temp"], "condition": data["weather"][0]["description"], "humidity": data["main"]["humidity"] } return weather_data except requests.exceptions.RequestException as e: print(f"Error fetching weather data: {e}") return None # In your update_weather() function: def update_weather(): global weather_data while SIMULATE_WEATHER: new_weather = get_weather_from_api() if new_weather: weather_data = new_weather print(f"Weather updated from API: {weather_data}") else: print("Failed to update weather from API.") time.sleep(60) ``` Remember to replace `"YOUR_OPENWEATHERMAP_API_KEY"` with your actual API key. You'll also need to adjust the `CITY` variable to the city you want weather data for. This comprehensive explanation and code should give you a solid starting point for building your weather MCP server in Python. Good luck!