Level guards

[Asarew]

Level guards

[rs]

With zerolog you can just do this:

if e := log.Debug(); e.Enabled() {
    // Compute log output only if current level is debug or higher.
    value := compute()
    e.Str("foo": value).Msg("some debug message")
}

[rs]

Do you have a use-case in mind?

[Asarew]

I'm currently developing a system where i heavily rely on logging to debug e2e tests. The places where i have to log items are hot-paths in my execution. When constructing the log Event I first log an interface{} and grab time.Now(), the operation it self is asynchronous and returns a wait object (future/promise/deferred).
When i wan to log the duration of the operation; i have to start a goroutine and wait on object to return.
But when to the logger level is higher than debug it's unnecessary to create a goroutine everytime where the result of the func is to discard the message anyway.

This was my specific use-case but i see the same pattern in other projects as well like kubernetes with there use of the glog package: https://godoc.org/github.com/golang/glog#V

[Asarew]

Thnx for the quick solution/reponse! I didn't spot the Event.Enabled() method. Even though i'm not the biggest fan of this api, it does exactly what i was looking for!

closing this issue as answered 👍