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Weather MCP

by LiuKeTong713
server.py3.04 kB
import json import httpx from typing import Any from mcp.server.fastmcp import FastMCP # 初始化 MCP 服务器 mcp = FastMCP("WeatherServer") # OpenWeather API 配置 OPENWEATHER_API_BASE = "https://api.openweathermap.org/data/2.5/weather" API_KEY = "06b242a38a843da5cc2d69b51b1cab01" # 请替换为你自己的 OpenWeather API Key USER_AGENT = "weather-app/1.0" async def fetch_weather(city: str) -> dict[str, Any]|None: """ 从 OpenWeather API 获取天气信息。 :param city: 城市名称(需使用英文,如 Beijing) :return: 天气数据字典;若出错返回包含 error 信息的字典 """ params = { "q": city, "appid": API_KEY, "units": "metric", "lang": "zh_cn" } headers = {"User-Agent": USER_AGENT} async with httpx.AsyncClient() as client: try: response = await client.get( OPENWEATHER_API_BASE, params=params, headers=headers, timeout=30.0 ) response.raise_for_status() return response.json() # 返回字典类型 except httpx.HTTPStatusError as e: return {"error": f"HTTP 错误: {e.response.status_code}"} except Exception as e: return {"error": f"请求失败: {str(e)}"} def format_weather(data: dict[str, Any] | str) -> str: """ 将天气数据格式化为易读文本。 :param data: 天气数据(可以是字典或 JSON 字符串) :return: 格式化后的天气信息字符串 """ # 如果传入的是字符串,则先转换为字典 if isinstance(data, str): try: data = json.loads(data) except Exception as e: return f"无法解析天气数据: {e}" # 如果数据中包含错误信息,直接返回错误提示 if "error" in data: return f"⚠️ {data['error']}" # 提取数据时做容错处理 city = data.get("name", "未知") country = data.get("sys", {}).get("country", "未知") temp = data.get("main", {}).get("temp", "N/A") humidity = data.get("main", {}).get("humidity", "N/A") wind_speed = data.get("wind", {}).get("speed", "N/A") # weather 可能为空列表,因此用 [0] 前先提供默认字典 weather_list = data.get("weather", [{}]) description = weather_list[0].get("description", "未知") return ( f"📍 {city}, {country}\n" f"🌡️ 温度: {temp}°C\n" f"💧 湿度: {humidity}%\n" f"💨 风速: {wind_speed} m/s\n" f"☁️ 天气: {description}\n" ) @mcp.tool() async def query_weather(city: str) -> str: """ 输入指定城市的英文名称,返回今日天气查询结果。 :param city: 城市名称(需使用英文) :return: 格式化后的天气信息 """ data = await fetch_weather(city) return format_weather(data) if __name__ == "__main__": # 以标准 I/O 方式运行 MCP 服务器 mcp.run(transport='stdio')

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