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from fastapi import FastAPI
import requests
import json
import time
app = FastAPI()
import os
# Access the API key from the secret
API_KEY = os.getenv("apikey")
API_URL = f"https://v6.exchangerate-api.com/v6/{API_KEY}/latest/USD"
CACHE = None
LAST_FETCH_TIME = None
CACHE_TTL = 86400 # Time to live for cache in seconds (1 day)
def fetch_exchange_rates():
"""Fetch the exchange rates from the API."""
response = requests.get(API_URL)
if response.status_code == 200:
return response.json()
else:
return None
def get_cached_rates():
"""Return cached rates if they exist and are not expired."""
global CACHE, LAST_FETCH_TIME
# Check if the cache is expired
if CACHE is None or (time.time() - LAST_FETCH_TIME) > CACHE_TTL:
# Cache is either not set or expired, fetch new rates
rates_data = fetch_exchange_rates()
if rates_data:
CACHE = rates_data
LAST_FETCH_TIME = time.time() # Update the fetch time
else:
return {"error": "Failed to fetch exchange rates"}
return CACHE
@app.get("/exchange-rates")
async def get_exchange_rates():
"""Endpoint to fetch the exchange rates."""
rates = get_cached_rates()
return rates
@app.get("/convert")
async def convert_currency(amount: float, from_currency: str, to_currency: str):
"""Endpoint to convert currency from one to another."""
rates = get_cached_rates()
if "error" in rates:
return {"error": "Failed to fetch exchange rates"}
try:
from_rate = rates["conversion_rates"][from_currency]
to_rate = rates["conversion_rates"][to_currency]
converted_amount = amount * (to_rate / from_rate)
converted_amount = str(converted_amount)
return {"converted_amount": converted_amount}
except KeyError:
return {"error": "Invalid currency code"}
@app.get("/supported-currencies")
async def get_supported_currencies():
"""Endpoint to return the list of supported currencies."""
rates = get_cached_rates()
if "error" in rates:
return {"error": "Failed to fetch exchange rates"}
# Extract the keys (currency codes) from the conversion_rates field
supported_currencies = list(rates["conversion_rates"].keys())
return {"currencies": supported_currencies}
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