Logging Facade

[Jérôme LAFORGE]

Hello Gophers,
Do you know whether logging facade framework exists for Go (as SF4J http://www.slf4j.org/ for Java) ?
My main goal is to develop one library and let to the final user the choice of logging framework.

Thx in adv.
Jérôme

[Ian Davis]

Before you do that, have a think about whether a framework is necessary.

 

For example, the author of an application can create a Logger interface that contains the methods they need, e.g. in the simple case:

 

type Logger interface{

    Printf(format string, v ...interface{})

}

 

Then they write their types like this:

 

type Processor struct {

    Logger Logger

}

 

func (p *Processor) DoSomething() {

    p.Logger.Printf("it's happening")

}

 

 

Now automatically any logging package that provides a logger with that method can be used by the application. In this case it includes the standard library logger and a bunch of others. They have complete choice. If they want to use a logging package that doesn't support Printf then a simple adapter that delegates can be written:

 

type LogAdapter struct {

    logger OtherLogger

}

 

func (la *LogAdapter) Printf(format string, v ...interface{}) {

   la.logger.Infof(format, v...)

}

 

 

Ian

[Zach Klippenstein]

If you're looking for leveled logging, there's glog: https://github.com/golang/glog. It's not a facade though.

[yun.z...@gmail.com]

I was looking around for the same thing and found this: https://github.com/ventu-io/slf

I agree with Ian, for simple logs, a interface will suffice. But for structured logs with Fields it gets a bit more complicated.