Integrating logrus with cobra

You can find a working example on my GitHub: https://github.com/seblegall/blog-scripts/tree/master/logrus-cobra

I recently had to refactor the way one of my app print logs. My idea was to use logrus as it is a very well known lib to produce logs with Go.

Logrus let you print nicely color-coded and structured logs and is completely API compatible with the standard library logger.

My first question was about log level and how to setup it once across all sub-directory/package of my project.

Under the hood, logrus instantiate a new variable log. Once done, calling the logrus.SetLevel() function will store the level directly in this newly instantiated struct.

Thus, we have a global struct, available across all sub-package making the level automatically shared without having to use dependency injection.

If you need to set a different level in a sub-package (for example), you just need to instantiate a new logger :

var log = logrus.New()

//...

log.Debug("debug log")