Set nested fields in Golang with the Logrus? - go

Question

I'm using github.com/sirupsen/logrus to make a logger. This simplifies how fields are being initiated in the logger (straightforward from docs):
package main
import "github.com/sirupsen/logrus"
func main() {
logFields := logrus.Fields{
"details": logrus.Fields{
"app_name": "Some name",
"app_version": "Some version",
},
}
logger := logrus.New()
logger.WithFields(logFields)
}
The library seems to allow to add fields with method WithFields only at top level (as in the last line).
But because my API has many steps, I need to add nested fields under details with every step (to accumulate log data), then output it all together in the end.
How can I add these fields?

Answer 1

logrus.Fields is just map[string]interface{}, so you can nest all data in every steps into a struct like
type Details struct {
Step1 string `json:"step1"`
Step2 string `json:"step2"`
Step3 string `json:"step3"`
}
and finally logger.WithFields(logFields).Debugln("some debug info")
Another method, you can create multiple variables to save data from every step, for example
var step1data = "step1"
var step2data = "step2"
and finally
logger.WithFields(logrus.Fields{
"details": logrus.Fields{
"step1": step1data,
"step2": step2data,
},
}).Debugln("some debug info")`