How to write logs into multiple files? - go

Question

In Golang how you guys manage to write logs into multiple file base on the package name.
For example in my current app, I am trying to collect multiple hardware stats from different packages called Netapp, IBM etc but under the same application. So, I would like to write logs from those package in separate folder like /var/log/myapp/netapp.log and /var/log/myapp/ibm.log?
Any pointer or clue would be very helpful ?
Thanks James

Answer 1

One approach you could take is to implement the Observer pattern. It's a great approach when you need to make several things happen with the same input/event. In your case, logging the same input to different logs. You can find more information here.
In a situation you described and following this example, you can do following things:
Your different logging implementations (with different logging destination folders) can implement the Observer interface by putting your logging code for each logging implementation in OnNotify method.
Create an instance of eventNotifier and register all your logging implementations with eventNotifier.Register method. Something like:
notifier := eventNotifier{
observers: map[Observer]struct{}{},
}
notifier.Register(netAppLogger)
notifier.Register(ibmLogger)
Use eventNotifier.Notify whenever and wherever you need to do logging and it will use all registered logging implementations.