Adding caller function, filename and line number to logrus log entries

log.go

package utils

import (
	"runtime"

	"github.com/Sirupsen/logrus"
)

// DecorateRuntimeContext appends line, file and function context to the logger
func DecorateRuntimeContext(logger *logrus.Entry) *logrus.Entry {
	if pc, file, line, ok := runtime.Caller(1); ok {
		fName := runtime.FuncForPC(pc).Name()
		return logger.WithField("file", file).WithField("line", line).WithField("func", fName)
	} else {
		return logger
	}
}

Trying to figure this out. How do I pass this decorator to an instance of *logrus.Logger? And every time a log statement like logger.Printf() is run, will it take this data?

Do you have any code that uses this decorator?

@sathishvj the way I am using this is as follows

Log := DecorateRuntimeContext // so I don't have to type it out every time
Log(logrus.WithFields(logrus.Fields{
        "key": "value"
})).Info("message")

I believe this function must be called inline and not packed away into some utility function because of the way it gets the line number and filename.

we will have to call this decorator function everytime we want to print a line?

in every function

formatter := runtime.Formatter{ChildFormatter: &log.TextFormatter{
	FullTimestamp: true,
}}
formatter.Line = true
log.SetFormatter(&formatter)
log.SetOutput(os.Stdout)
log.SetLevel(log.InfoLevel)
log.WithFields(log.Fields{
	"file": "main.go",
}).Info("Server is running...")

Note: import ( runtime "github.com/banzaicloud/logrus-runtime-formatter"
log "github.com/sirupsen/logrus")