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https://github.com/GSA/notifications-api.git
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b01ec05aaf
normally we check the app's status page to see if migrations need running. However, if the _status endpoint doesn't respond with 200, we don't necessarily want to abort the deploy - we may be trying to deploy a code fix that fixes that status endpoint for example. We don't know whether to run the migrations or not, so err on the side of caution by re-running the migration. The migration itself might be the fix that gets the app working after all. had to do a little song and dance because sometimes the response won't be populated before an exception is thrown
47 lines
1.8 KiB
Python
47 lines
1.8 KiB
Python
import os
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from os.path import dirname, abspath
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import requests
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import sys
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def get_latest_db_migration_to_apply():
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project_dir = dirname(dirname(abspath(__file__))) # Get the main project directory
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migrations_dir = '{}/migrations/versions/'.format(project_dir)
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migration_files = [migration_file for migration_file in os.listdir(migrations_dir) if migration_file.endswith('py')]
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# sometimes there's a trailing underscore, if script was created with `flask db migrate --rev-id=...`
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latest_file = sorted(migration_files, reverse=True)[0].replace('_.py', '').replace('.py', '')
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return latest_file
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def get_current_db_version():
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api_status_url = '{}/_status'.format(os.getenv('API_HOST_NAME'))
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try:
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response = requests.get(api_status_url)
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response.raise_for_status()
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current_db_version = response.json()['db_version']
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return current_db_version
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except requests.exceptions.ConnectionError:
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print(f'Could not make web request to {api_status_url}', file=sys.stderr)
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return ''
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except Exception: # we expect these to be either either a http status code error, or a json decoding error
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print(
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f'Could not read status endpoint!\n\ncode {response.status_code}\nresponse "{response.text}"',
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file=sys.stderr
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)
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# if we can't make a request to the API, the API is probably down. By returning a blank string (which won't
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# match the filename of the latest migration), we force the migration to run, as the code change to fix the api
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# might involve a migration file.
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return ''
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def run():
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if get_current_db_version() == get_latest_db_migration_to_apply():
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print('no')
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else:
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print('yes')
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if __name__ == "__main__":
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run()
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