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39 lines
1.0 KiB
Python
39 lines
1.0 KiB
Python
import os
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from datetime import datetime
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from urllib.request import Request, urlopen
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SITE = os.environ['site'] # URL of the site to check, stored in the site environment variable
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EXPECTED = os.environ['expected'] # String expected to be on the page, stored in the expected environment variable
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def validate(res):
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"""
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Return False to trigger the canary
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Currently this simply checks whether the EXPECTED string is present.
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However, you could modify this to perform any number of arbitrary
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checks on the contents of SITE.
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"""
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return EXPECTED in res
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def lambda_handler(event, context):
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print(f"Checking {SITE} at {event['time']}...")
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try:
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req = Request(SITE, headers={'User-Agent': 'AWS Lambda'})
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if not validate(str(urlopen(req).read())):
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raise Exception('Validation failed')
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except Exception:
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print('Check failed!')
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raise
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else:
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print('Check passed!')
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return event['time']
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finally:
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print(f"Checking complete at {str(datetime.now())}")
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