wait_for_it.py

A pure Python implementation of wait-for-it.sh with no dependencies, however if requests is available it will be used.

Intended to be used as a lightweight dependency service checker before startup of apps.

Requirements

Python3+

Usage

Copy and paste the script into your deployable and prepend the startup of your app with the check for a required service:

python wait_for_it.py http://localhost:1234 && start_my_app

Optionally specify:

• --timeout N to wait N seconds before giving up, defaults to 5 seconds.
• --retry N to wait N seconds between attempts, defaults to 1 second.

Why?

I kept using variations of this script in Python Docker entry points and didn't want to pull external packages or copy some impossible to understand bash code, so I decided to write this fairly simple one that people can easily adapt if needed.

Alternatives

• wait-for-it.sh and some Bash magic
• The wait-for-it package in PyPI

License

MIT