Machine readable addons logs

[nirs]

Currently addons use print() and fstrings (e.g. f"{value}")) for logging. The motivation was to make writing addons really easy for new contributors.

This make it hard to handle logs in a useful way in drenv, for example:

• Log warnings emitted by the addon (e.g. timeout was too short - operation finished in time but could fail in next run)
• Parse errors by drenv, for reporting error in machine readable format to the tool running drenv

We can keep logging easy by using a drenv log module, initialized when parsing addon arguments:

from drenv import addon

args = addon.parse_args()

addon.debug("message with value %s", 42)
addon.info("message")

The output will use jsonlines:

{"time": "2024-03-31 11:24:09,869", "level": "DEBUG", "message": "message with value 42"}
{"time": "2024-03-31 11:24:09,869", "level": "INFO", "message": "message"}

The addon module can install a sys.excepthook that will log errors using the same formatter.