import requests
from typing import List, Dict, Any, Optional
class NightscoutClient:
def __init__(self, url: str, secret: Optional[str] = None):
"""
Initialize Nightscout Client.
:param url: Base URL of the Nightscout instance
:param secret: API Secret (optional, usually needed for write operations or secure instances)
"""
self.url = url.rstrip('/')
self.secret = secret
def get_sgv(self, count: int = 1) -> List[Dict[str, Any]]:
"""
Fetch recent sensor glucose values (SGV).
Endpoint: /api/v1/entries.json
"""
headers = {}
if self.secret:
# Nightscout usually expects API-SECRET header (SHA1 checksum) or plain in some versions
# For simplicity in this implementation plan, we assume it passes the token if needed
# But standard Nightscout auth often uses "api_secret" header
headers['api-secret'] = self.secret
params = {'count': count}
try:
# Usually Dexcom data is found in /entries.json or /entries/sgv.json
response = requests.get(f"{self.url}/api/v1/entries.json", headers=headers, params=params)
response.raise_for_status()
data = response.json()
entries = []
for entry in data:
# Filter for valid glucose readings
if 'sgv' in entry:
entries.append({
'sgv': entry['sgv'],
'direction': entry.get('direction', 'NONE'),
'dateString': entry.get('dateString', ''),
'delta': entry.get('delta', 0)
})
return entries
except requests.exceptions.RequestException as e:
# We catch this in the test
raise Exception(f"Failed to fetch data from Nightscout: {e}")
