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匯率查詢 MCP Tool
使用標準化接口實作的匯率功能
"""
import os
import json
import logging
import aiohttp
import asyncio
from datetime import datetime
from typing import Dict, Any, Optional
from dotenv import load_dotenv
from .base_tool import MCPTool, ValidationError, ExecutionError, StandardToolSchemas
# 載入環境變數
load_dotenv()
logger = logging.getLogger("mcp.tools.exchange")
# API配置
EXCHANGE_API_BASE = "https://api.exchangerate-api.com/v4/latest"
FIXER_API_BASE = "https://data.fixer.io/api/latest"
FIXER_API_KEY = os.getenv("FIXER_API_KEY", "")
class ExchangeTool(MCPTool):
"""匯率查詢 MCP 工具"""
NAME = "exchange_query"
DESCRIPTION = "Query real-time exchange rates between major currencies"
CATEGORY = "生活資訊"
TAGS = ["exchange", "匯率", "貨幣"]
KEYWORDS = ["匯率", "美元", "台幣", "exchange", "USD", "TWD", "貨幣", "換算"]
USAGE_TIPS = [
"提供源貨幣和目標貨幣代碼（如 USD, TWD）",
"支援主要國際貨幣",
"可查詢即時匯率與歷史趨勢"
]
@classmethod
def get_input_schema(cls) -> Dict[str, Any]:
"""獲取輸入參數模式"""
return StandardToolSchemas.create_input_schema({
"from_currency": {
"type": "string",
"description": "源貨幣代碼 (如 USD, EUR, TWD)",
"default": "USD",
"pattern": "^[A-Z]{3}$"
},
"to_currency": {
"type": "string",
"description": "目標貨幣代碼 (如 TWD, USD, EUR)",
"default": "TWD",
"pattern": "^[A-Z]{3}$"
},
"amount": {
"type": "number",
"description": "轉換金額",
"default": 1.0,
"minimum": 0.01
},
"conversion": {
"type": "boolean",
"description": "是否進行金額轉換計算",
"default": True
}
}, ["from_currency", "to_currency"])
@classmethod
def get_output_schema(cls) -> Dict[str, Any]:
"""獲取輸出結果模式"""
base_schema = StandardToolSchemas.create_output_schema()
base_schema["properties"].update({
"rate": {"type": "number"},
"converted_amount": {"type": ["number", "null"]},
"raw_data": {"type": "object"}
})
return base_schema
@classmethod
async def execute(cls, arguments: Dict[str, Any]) -> Dict[str, Any]:
"""執行匯率查詢"""
from_currency = arguments.get("from_currency", "USD").upper()
to_currency = arguments.get("to_currency", "TWD").upper()
amount = arguments.get("amount", 1.0)
conversion = arguments.get("conversion", True)
try:
# 獲取匯率數據
rate_data = await cls._fetch_exchange_rate(from_currency, to_currency)
if rate_data.get("success"):
rate = rate_data.get("rate")
# 生成結構化數據供 AI 格式化
formatted_text = cls._format_exchange_response(
from_currency, to_currency, rate, amount, conversion, rate_data.get("metadata", {})
)
return cls.create_success_response(
content=formatted_text,
data={
"raw_data": {
"rate": rate,
"from_currency": from_currency,
"to_currency": to_currency,
"amount": amount,
"converted_amount": amount * rate if conversion else None,
"rate_data": rate_data
}
}
)
else:
return cls.create_error_response(
error=rate_data.get("error", "獲取匯率失敗"),
code="FETCH_ERROR"
)
except Exception as e:
logger.error(f"匯率查詢錯誤: {e}")
raise ExecutionError(f"匯率查詢時發生錯誤: {str(e)}", e)
@staticmethod
async def _fetch_exchange_rate(from_currency: str, to_currency: str) -> Dict[str, Any]:
"""獲取匯率數據"""
# 首先嘗試免費 API
try:
result = await ExchangeTool._fetch_from_exchangerate_api(from_currency, to_currency)
if result.get("success"):
return result
except Exception as e:
logger.warning(f"免費匯率 API 失敗: {e}")
# 如果有 Fixer API Key，嘗試備用 API
if FIXER_API_KEY:
try:
result = await ExchangeTool._fetch_from_fixer_api(from_currency, to_currency)
if result.get("success"):
return result
except Exception as e:
logger.warning(f"Fixer API 失敗: {e}")
return {
"success": False,
"error": "所有匯率 API 都無法使用，請稍後再試"
}
@staticmethod
async def _fetch_from_exchangerate_api(from_currency: str, to_currency: str) -> Dict[str, Any]:
"""從 exchangerate-api.com 獲取匯率"""
url = f"{EXCHANGE_API_BASE}/{from_currency}"
async with aiohttp.ClientSession() as session:
async with session.get(url, timeout=10) as response:
if response.status == 200:
data = await response.json()
rates = data.get("rates", {})
if to_currency in rates:
rate = rates[to_currency]
return {
"success": True,
"rate": rate,
"metadata": {
"source": "exchangerate-api.com",
"base": data.get("base"),
"date": data.get("date"),
"timestamp": data.get("timestamp")
}
}
else:
return {
"success": False,
"error": f"不支援的貨幣: {to_currency}"
}
else:
return {
"success": False,
"error": f"匯率 API 請求失敗，狀態碼: {response.status}"
}
@staticmethod
async def _fetch_from_fixer_api(from_currency: str, to_currency: str) -> Dict[str, Any]:
"""從 fixer.io API 獲取匯率"""
url = f"{FIXER_API_BASE}?access_key={FIXER_API_KEY}&base={from_currency}&symbols={to_currency}"
async with aiohttp.ClientSession() as session:
async with session.get(url, timeout=10) as response:
if response.status == 200:
data = await response.json()
if data.get("success"):
rates = data.get("rates", {})
if to_currency in rates:
rate = rates[to_currency]
return {
"success": True,
"rate": rate,
"metadata": {
"source": "fixer.io",
"base": data.get("base"),
"date": data.get("date"),
"timestamp": data.get("timestamp")
}
}
else:
return {
"success": False,
"error": f"不支援的貨幣: {to_currency}"
}
else:
error_info = data.get("error", {})
return {
"success": False,
"error": f"Fixer API 錯誤: {error_info.get('info', '未知錯誤')}"
}
else:
return {
"success": False,
"error": f"Fixer API 請求失敗，狀態碼: {response.status}"
}
@staticmethod
def _format_exchange_response(from_currency: str, to_currency: str, rate: float,
amount: float, conversion: bool, metadata: Dict) -> str:
"""格式化匯率回應"""
# 貨幣符號和名稱映射
currency_info = ExchangeTool._get_currency_info()
from_symbol = currency_info.get(from_currency, {}).get("symbol", from_currency)
from_name = currency_info.get(from_currency, {}).get("name", from_currency)
to_symbol = currency_info.get(to_currency, {}).get("symbol", to_currency)
to_name = currency_info.get(to_currency, {}).get("name", to_currency)
# 標題
result = f"💱 匯率資訊\n\n"
# 匯率
result += f"💰 匯率: 1 {from_currency} = {rate:.4f} {to_currency}\n"
result += f"📈 {from_name} → {to_name}\n\n"
# 如果是轉換計算
if conversion and amount != 1.0:
converted = amount * rate
result += f"🔄 金額轉換\n"
result += f"📊 {amount:,.2f} {from_currency} = {converted:,.2f} {to_currency}\n"
result += f"💸 {from_symbol}{amount:,.2f} → {to_symbol}{converted:,.2f}\n\n"
# 數據來源和時間
source = metadata.get("source", "未知")
date = metadata.get("date", "")
if date:
result += f"📅 數據日期: {date}\n"
result += f"🔗 數據來源: {source}\n"
result += f"⏰ 查詢時間: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}\n"
# 匯率變化提示
result += f"\n💡 匯率會隨市場變動，僅供參考"
return result
@staticmethod
def _get_currency_info() -> Dict[str, Dict[str, str]]:
"""獲取貨幣資訊映射"""
return {
"TWD": {"symbol": "NT$", "name": "新台幣"},
"USD": {"symbol": "$", "name": "美元"},
"EUR": {"symbol": "€", "name": "歐元"},
"JPY": {"symbol": "¥", "name": "日圓"},
"GBP": {"symbol": "£", "name": "英鎊"},
"AUD": {"symbol": "A$", "name": "澳幣"},
"CAD": {"symbol": "C$", "name": "加幣"},
"CHF": {"symbol": "Fr", "name": "瑞士法郎"},
"CNY": {"symbol": "¥", "name": "人民幣"},
"HKD": {"symbol": "HK$", "name": "港幣"},
"NZD": {"symbol": "NZ$", "name": "紐幣"},
"KRW": {"symbol": "₩", "name": "韓元"},
"SGD": {"symbol": "S$", "name": "新加坡幣"},
"THB": {"symbol": "฿", "name": "泰銖"},
"MYR": {"symbol": "RM", "name": "馬幣"},
"IDR": {"symbol": "Rp", "name": "印尼盧比"},
"PHP": {"symbol": "₱", "name": "菲律賓比索"},
"VND": {"symbol": "₫", "name": "越南盾"},
"RUB": {"symbol": "₽", "name": "俄羅斯盧布"},
"BRL": {"symbol": "R$", "name": "巴西雷亞爾"},
"ZAR": {"symbol": "R", "name": "南非蘭特"},
"INR": {"symbol": "₹", "name": "印度盧比"}
} |