Log accordingly to a field, is there possible ?

[renathoaz]

I would like to log accodingly to field in the log, like this:
log.WithFields(log.Fields{"Field": "logname"}).Info("My log message!")

So all logs that contains that field would go to logname.log, if I have:
log.WithFields(log.Fields{"Field": "logname2"}).Info("My log message!")
It would go to logname2.log

How can I achieve that ?

[rifflock]

Hm... An interesting usecase. Not one I'd considered going into this.

Currently, It's not something that can be done. I set it up to be an exact mapping between entry.Level and a file, then later streams were added. If you want to write a PR you could probably do something similar to the introduction of streams.

If you wanted to add support for file routing by Fields you would need the following:

• You'd have to add code to the fileWrite method that would allow using something other than entry.Level as the file selector.
• You'd have to add a Field-Filename map that would be set in the contructor. Similar to the PathMap, and if you just create a different type like FieldPathMap then it could be supported without too much difficulty.

I don't see it as a super complex change, but you'd have to be really careful to not introduce regressions.