Library Website Tools

#!/usr/bin/env -S uv run --script
# /// script
# requires-python = ">=3.12"
# dependencies = []
# ///

import urllib.request
import json
import socket
import ssl
import sys
from urllib.error import HTTPError, URLError

# Retrieve McKeldin hours from libtools search

BASE = 'https://api.www.lib.umd.edu/api/libtools/'
ENDPOINT = 'mckeldin/hours/today'

# A host name that does not resolve, or a certificate that will not verify,
# is a settled fact about the URL rather than a passing condition: it means
# this example is pointed somewhere that no longer answers for it. Every other
# connection failure -- refused, reset, timed out -- may succeed on a retry.
PERMANENT_FAILURES = (socket.gaierror, ssl.SSLCertVerificationError)

hours_url = BASE + ENDPOINT

# Get search results as parsed JSON
try:
    with urllib.request.urlopen(hours_url) as request:
        response = json.loads(request.read())
except HTTPError as error:
    print(f'{hours_url} returned HTTP {error.code}: {error.reason}', file=sys.stderr)
    # 75 = EX_TEMPFAIL: the service is reachable but cannot serve right now.
    # A 4xx means this request is no longer valid, which is this example's problem.
    sys.exit(75 if error.code >= 500 or error.code == 429 else 1)
except URLError as error:
    # Nothing answered, so the request was never judged. What stopped it
    # decides whose problem it is.
    print(f'Could not reach {hours_url}: {error.reason}', file=sys.stderr)
    sys.exit(1 if isinstance(error.reason, PERMANENT_FAILURES) else 75)
except json.JSONDecodeError:
    print(f'{hours_url} did not return JSON', file=sys.stderr)
    # A body that is not JSON means the API changed under this example.
    sys.exit(1)

status = response['status']

print('----')
print(f'McKeldin Hours: {status}')