#!/usr/bin/env python

# Takes a path to a file and a delta. The file must simply contain an epoch
# timestamp. It can be an integer or a float, as can the delta.
#
# Alerts critical if (now - timestamp contained in file) > delta.
#
# Rick Elrod <relrod@redhat.com>
# MIT

import sys
import time

if len(sys.argv) != 3:
    print('UNKNOWN: Pass path to file and delta as parameters')
    sys.exit(3)

filename = sys.argv[1]
delta = float(sys.argv[2])

timestamp = None

try:
    with open(filename, 'r') as f:
        timestamp = float(f.read().strip())
except Exception as e:
    print('UNKNOWN: Unable to open/read file path')
    sys.exit(3)

difference = round(time.time() - timestamp, 2)
if difference > delta:
    print(
        'CRITICAL: Timestamp in file (%.2f) exceeds delta (%.2f) by %.2f seconds' % (
            timestamp,
            delta,
            difference - delta))
    sys.exit(2)

print('OK: Timestamp in file (%.2f) is within delta (%.2f) of now, by %.2f seconds' % (
    timestamp,
    delta,
    abs(difference - delta)))
sys.exit(0)