zenmancn/digitalmarketplace-utils

Common utils for Digital Marketplace apps.

Digital Marketplace utils

What's in here?

• Digital Marketplace API clients
• Formatting utilities for Digital Marketplace
• Digital Marketplace logging for Flask using JSON Logging
• Utility functions/libraries for Amazon S3, Mailchimp, Notify, Cloudwatch
• Helper code for Flask configuration
• A formed version of Flask Feature Flags

Logging from applications

When logging from applications you should write your message as a format string and pass any required arguments to the log method in the extra named argument. This allows our logging to use them as separate fields in our JSON logs making it much easier to search and aggregate on them.

logger.info("the user {user_id} did the thing '{thing}'", extra={
    'user_id': user_id, 'thing': thing
})

Note that apart from not getting the benefit, passing the formatted message can be dangerous. User generated content may be passed, unescaped to the .format method.

Versioning

Releases of this project follow semantic versioning, ie

Given a version number MAJOR.MINOR.PATCH, increment the:

• MAJOR version when you make incompatible API changes,
• MINOR version when you add functionality in a backwards-compatible manner, and
• PATCH version when you make backwards-compatible bug fixes.

To make a new version:

• update the version in the dmutils/__init__.py file
• if you are making a major change, also update the change log;

When the pull request is merged a Jenkins job will be run to tag the new version.