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Dynamic Fields With Defer #95

@ahshah

Description

@ahshah

Hi folks,
I'd like to add a field to my logging context after I have some relevant information, I've supplied the peudocode of what I'd like to do. Looking over the code in log/entry.go, this should be pretty straightforward, however it seems like a conscience decision to not allow modification to the Entry structs field variable. Instead, similar functions (i.e WithField) require the building of a new Entry entirely.
Why is the Entry struct immutable in this way?

func DownloadFile() (int) { 
   // Off to the network we go
}
func main() {
      ctx := log.WithFields(log.Fields{
          "module": "main",
     })
     defer ctx.Info("Download complete")
     bytesDownloaded := DownloadFile()
     ctx.AddField("downloadSize", bytesDownloaded)
}

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