I’m excited to announce LoggerHandlerKit – an educational package for developers who want to write their own logger handler. It provides:

1. An example test suite for the default Elixir logger
2. A collection of test helpers, including test cases
3. Docs and code comments to help you through

The package gives developers a clear scope of test cases to implement and offers guidance along the way. Once all tests pass, you should have a good grasp of how handlers work and your logger handler should be… well, good. Or at least it will be able to handle a large variety of log events and have a solid test suite, it can still be bad in its own unique way

Right now it covers the core handler functionality and touches on Logger.Translator’s role, but I’m planning to add guides about other aspects too – things like overload protection and encoding/serialization.

To showcase how using LoggerHandlerKit in an existing logging library looks like I switched Sentry and DiscoLog suites to it: sentry, disco-log

Hex: logger_handler_kit | Hex
Github: