How to get function name in log output ?

[ganeshskudva]

How to get function name printed in logs ? I see this PR request has added this functionality. I am unable to get it working though

This is my code:

package main

import (
	"go.uber.org/zap"
)

var logger *zap.Logger

func main() {
	logger := NewLogger()
	logger.Info("Test msg Main")
	TestFunc(logger)
}

func TestFunc(logger *zap.Logger)  {
	logger.Info("Test msg TestFunc")
}

func NewLogger() *zap.Logger {
	config := zap.NewDevelopmentConfig()
	opts := []zap.Option{
		zap.AddCallerSkip(1), // traverse call depth for more useful log lines
		zap.AddCaller(),
	}

	logger, _ = config.Build(opts...)
	return logger
}

This is the output I get with/without the addition of AddCaller() option

2021-03-01T15:00:02.927-0800    INFO    runtime/proc.go:204     Test msg Main
2021-03-01T15:00:02.927-0800    INFO    cmd/main.go:12  Test msg TestFunc

I am expecting something like

2021-03-01T15:00:02.927-0800    INFO    runtime/proc.go:204   main  Test msg Main
2021-03-01T15:00:02.927-0800    INFO    cmd/main.go:12  TestFunc Test msg TestFunc](url)

[prashantv]

You need to set the FunctionKey field in the EncoderConfig, e.g.,

	config := zap.NewDevelopmentConfig()
	config.EncoderConfig.FunctionKey = "func"

That should include a field called "func" which will contain the caller's function name.