如何覆盖现有go包的func？

I am new to go and cannot really put my head around it. I want to override a func in an existing package in go "log4go" on every log4go.Error("An error") call. What is the best way to do it? If I want to enhance an existing method, what else could be the way? Please bear if its a basic question.

You simply cannot do this. There is no "best way" to do something impossible.

All you have are alternatives:

• Fork log4go and patch it.
• Do not use log4go.Error but your own wrapper myError which wraps around log4go's Error function.
• Redesign or look for a different logging package.