How to implement level based logging in golang?

Question

Is there any good wrapper available for level based logging in golang? If not, how should I go about implementing one myself?

What I want is pretty simple. I want a

Answer 1

Some more suggestions, now that the existing answers are quite old:

• https://github.com/op/go-logging - smaller than the other here
• https://github.com/sirupsen/logrus - used in many popular projects such as Docker
• https://github.com/inconshreveable/log15
• https://github.com/golang/glog - from Google, implementation of their C++ glog library in Go
• https://github.com/go-kit/kit/tree/master/log focused on "structured logging" which is better for tools to consume
• https://github.com/uber-go/zap - "blazing fast"